➕ Add chi (again)
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.idea
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*.sw?
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.vscode
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language: go
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go:
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- 1.10.x
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- 1.11.x
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- 1.12.x
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script:
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- go get -d -t ./...
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- go vet ./...
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- go test ./...
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- >
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go_version=$(go version);
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if [ ${go_version:13:4} = "1.12" ]; then
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go get -u golang.org/x/tools/cmd/goimports;
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goimports -d -e ./ | grep '.*' && { echo; echo "Aborting due to non-empty goimports output."; exit 1; } || :;
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fi
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# Changelog
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## v4.0.0 (2019-01-10)
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- chi v4 requires Go 1.10.3+ (or Go 1.9.7+) - we have deprecated support for Go 1.7 and 1.8
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- router: respond with 404 on router with no routes (#362)
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- router: additional check to ensure wildcard is at the end of a url pattern (#333)
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- middleware: deprecate use of http.CloseNotifier (#347)
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- middleware: fix RedirectSlashes to include query params on redirect (#334)
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- History of changes: see https://github.com/go-chi/chi/compare/v3.3.4...v4.0.0
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## v3.3.4 (2019-01-07)
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- Minor middleware improvements. No changes to core library/router. Moving v3 into its
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- own branch as a version of chi for Go 1.7, 1.8, 1.9, 1.10, 1.11
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- History of changes: see https://github.com/go-chi/chi/compare/v3.3.3...v3.3.4
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## v3.3.3 (2018-08-27)
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- Minor release
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- See https://github.com/go-chi/chi/compare/v3.3.2...v3.3.3
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## v3.3.2 (2017-12-22)
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- Support to route trailing slashes on mounted sub-routers (#281)
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- middleware: new `ContentCharset` to check matching charsets. Thank you
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@csucu for your community contribution!
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## v3.3.1 (2017-11-20)
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- middleware: new `AllowContentType` handler for explicit whitelist of accepted request Content-Types
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- middleware: new `SetHeader` handler for short-hand middleware to set a response header key/value
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- Minor bug fixes
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## v3.3.0 (2017-10-10)
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- New chi.RegisterMethod(method) to add support for custom HTTP methods, see _examples/custom-method for usage
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- Deprecated LINK and UNLINK methods from the default list, please use `chi.RegisterMethod("LINK")` and `chi.RegisterMethod("UNLINK")` in an `init()` function
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## v3.2.1 (2017-08-31)
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- Add new `Match(rctx *Context, method, path string) bool` method to `Routes` interface
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and `Mux`. Match searches the mux's routing tree for a handler that matches the method/path
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- Add new `RouteMethod` to `*Context`
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- Add new `Routes` pointer to `*Context`
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- Add new `middleware.GetHead` to route missing HEAD requests to GET handler
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- Updated benchmarks (see README)
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## v3.1.5 (2017-08-02)
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- Setup golint and go vet for the project
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- As per golint, we've redefined `func ServerBaseContext(h http.Handler, baseCtx context.Context) http.Handler`
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to `func ServerBaseContext(baseCtx context.Context, h http.Handler) http.Handler`
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## v3.1.0 (2017-07-10)
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- Fix a few minor issues after v3 release
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- Move `docgen` sub-pkg to https://github.com/go-chi/docgen
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- Move `render` sub-pkg to https://github.com/go-chi/render
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- Add new `URLFormat` handler to chi/middleware sub-pkg to make working with url mime
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suffixes easier, ie. parsing `/articles/1.json` and `/articles/1.xml`. See comments in
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https://github.com/go-chi/chi/blob/master/middleware/url_format.go for example usage.
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## v3.0.0 (2017-06-21)
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- Major update to chi library with many exciting updates, but also some *breaking changes*
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- URL parameter syntax changed from `/:id` to `/{id}` for even more flexible routing, such as
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`/articles/{month}-{day}-{year}-{slug}`, `/articles/{id}`, and `/articles/{id}.{ext}` on the
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same router
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- Support for regexp for routing patterns, in the form of `/{paramKey:regExp}` for example:
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`r.Get("/articles/{name:[a-z]+}", h)` and `chi.URLParam(r, "name")`
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- Add `Method` and `MethodFunc` to `chi.Router` to allow routing definitions such as
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`r.Method("GET", "/", h)` which provides a cleaner interface for custom handlers like
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in `_examples/custom-handler`
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- Deprecating `mux#FileServer` helper function. Instead, we encourage users to create their
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own using file handler with the stdlib, see `_examples/fileserver` for an example
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- Add support for LINK/UNLINK http methods via `r.Method()` and `r.MethodFunc()`
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- Moved the chi project to its own organization, to allow chi-related community packages to
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be easily discovered and supported, at: https://github.com/go-chi
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- *NOTE:* please update your import paths to `"github.com/go-chi/chi"`
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- *NOTE:* chi v2 is still available at https://github.com/go-chi/chi/tree/v2
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## v2.1.0 (2017-03-30)
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- Minor improvements and update to the chi core library
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- Introduced a brand new `chi/render` sub-package to complete the story of building
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APIs to offer a pattern for managing well-defined request / response payloads. Please
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check out the updated `_examples/rest` example for how it works.
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- Added `MethodNotAllowed(h http.HandlerFunc)` to chi.Router interface
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## v2.0.0 (2017-01-06)
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- After many months of v2 being in an RC state with many companies and users running it in
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production, the inclusion of some improvements to the middlewares, we are very pleased to
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announce v2.0.0 of chi.
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## v2.0.0-rc1 (2016-07-26)
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- Huge update! chi v2 is a large refactor targetting Go 1.7+. As of Go 1.7, the popular
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community `"net/context"` package has been included in the standard library as `"context"` and
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utilized by `"net/http"` and `http.Request` to managing deadlines, cancelation signals and other
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request-scoped values. We're very excited about the new context addition and are proud to
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introduce chi v2, a minimal and powerful routing package for building large HTTP services,
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with zero external dependencies. Chi focuses on idiomatic design and encourages the use of
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stdlib HTTP handlers and middlwares.
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- chi v2 deprecates its `chi.Handler` interface and requires `http.Handler` or `http.HandlerFunc`
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- chi v2 stores URL routing parameters and patterns in the standard request context: `r.Context()`
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- chi v2 lower-level routing context is accessible by `chi.RouteContext(r.Context()) *chi.Context`,
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which provides direct access to URL routing parameters, the routing path and the matching
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routing patterns.
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- Users upgrading from chi v1 to v2, need to:
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1. Update the old chi.Handler signature, `func(ctx context.Context, w http.ResponseWriter, r *http.Request)` to
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the standard http.Handler: `func(w http.ResponseWriter, r *http.Request)`
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2. Use `chi.URLParam(r *http.Request, paramKey string) string`
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or `URLParamFromCtx(ctx context.Context, paramKey string) string` to access a url parameter value
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## v1.0.0 (2016-07-01)
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- Released chi v1 stable https://github.com/go-chi/chi/tree/v1.0.0 for Go 1.6 and older.
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## v0.9.0 (2016-03-31)
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- Reuse context objects via sync.Pool for zero-allocation routing [#33](https://github.com/go-chi/chi/pull/33)
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- BREAKING NOTE: due to subtle API changes, previously `chi.URLParams(ctx)["id"]` used to access url parameters
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has changed to: `chi.URLParam(ctx, "id")`
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# Contributing
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## Prerequisites
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1. [Install Go][go-install].
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2. Download the sources and switch the working directory:
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```bash
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go get -u -d github.com/go-chi/chi
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cd $GOPATH/src/github.com/go-chi/chi
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```
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## Submitting a Pull Request
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A typical workflow is:
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1. [Fork the repository.][fork] [This tip maybe also helpful.][go-fork-tip]
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2. [Create a topic branch.][branch]
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3. Add tests for your change.
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4. Run `go test`. If your tests pass, return to the step 3.
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5. Implement the change and ensure the steps from the previous step pass.
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6. Run `goimports -w .`, to ensure the new code conforms to Go formatting guideline.
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7. [Add, commit and push your changes.][git-help]
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8. [Submit a pull request.][pull-req]
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[go-install]: https://golang.org/doc/install
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[go-fork-tip]: http://blog.campoy.cat/2014/03/github-and-go-forking-pull-requests-and.html
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[fork]: https://help.github.com/articles/fork-a-repo
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[branch]: http://learn.github.com/p/branching.html
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[git-help]: https://guides.github.com
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[pull-req]: https://help.github.com/articles/using-pull-requests
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Copyright (c) 2015-present Peter Kieltyka (https://github.com/pkieltyka), Google Inc.
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MIT License
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# <img alt="chi" src="https://cdn.rawgit.com/go-chi/chi/master/_examples/chi.svg" width="220" />
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[![GoDoc Widget]][GoDoc] [![Travis Widget]][Travis]
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`chi` is a lightweight, idiomatic and composable router for building Go HTTP services. It's
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especially good at helping you write large REST API services that are kept maintainable as your
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project grows and changes. `chi` is built on the new `context` package introduced in Go 1.7 to
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handle signaling, cancelation and request-scoped values across a handler chain.
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The focus of the project has been to seek out an elegant and comfortable design for writing
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REST API servers, written during the development of the Pressly API service that powers our
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public API service, which in turn powers all of our client-side applications.
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The key considerations of chi's design are: project structure, maintainability, standard http
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handlers (stdlib-only), developer productivity, and deconstructing a large system into many small
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parts. The core router `github.com/go-chi/chi` is quite small (less than 1000 LOC), but we've also
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included some useful/optional subpackages: [middleware](/middleware), [render](https://github.com/go-chi/render) and [docgen](https://github.com/go-chi/docgen). We hope you enjoy it too!
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## Install
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`go get -u github.com/go-chi/chi`
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## Features
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* **Lightweight** - cloc'd in ~1000 LOC for the chi router
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* **Fast** - yes, see [benchmarks](#benchmarks)
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* **100% compatible with net/http** - use any http or middleware pkg in the ecosystem that is also compatible with `net/http`
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* **Designed for modular/composable APIs** - middlewares, inline middlewares, route groups and subrouter mounting
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* **Context control** - built on new `context` package, providing value chaining, cancelations and timeouts
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* **Robust** - in production at Pressly, CloudFlare, Heroku, 99Designs, and many others (see [discussion](https://github.com/go-chi/chi/issues/91))
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* **Doc generation** - `docgen` auto-generates routing documentation from your source to JSON or Markdown
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* **No external dependencies** - plain ol' Go stdlib + net/http
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## Examples
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See [_examples/](https://github.com/go-chi/chi/blob/master/_examples/) for a variety of examples.
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**As easy as:**
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```go
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package main
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import (
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"net/http"
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"github.com/go-chi/chi"
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)
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func main() {
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r := chi.NewRouter()
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r.Get("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte("welcome"))
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})
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http.ListenAndServe(":3000", r)
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}
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```
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**REST Preview:**
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Here is a little preview of how routing looks like with chi. Also take a look at the generated routing docs
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in JSON ([routes.json](https://github.com/go-chi/chi/blob/master/_examples/rest/routes.json)) and in
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Markdown ([routes.md](https://github.com/go-chi/chi/blob/master/_examples/rest/routes.md)).
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I highly recommend reading the source of the [examples](https://github.com/go-chi/chi/blob/master/_examples/) listed
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above, they will show you all the features of chi and serve as a good form of documentation.
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```go
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import (
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//...
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"context"
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"github.com/go-chi/chi"
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"github.com/go-chi/chi/middleware"
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)
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func main() {
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r := chi.NewRouter()
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// A good base middleware stack
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r.Use(middleware.RequestID)
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r.Use(middleware.RealIP)
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r.Use(middleware.Logger)
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r.Use(middleware.Recoverer)
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// Set a timeout value on the request context (ctx), that will signal
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// through ctx.Done() that the request has timed out and further
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// processing should be stopped.
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r.Use(middleware.Timeout(60 * time.Second))
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r.Get("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte("hi"))
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})
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// RESTy routes for "articles" resource
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r.Route("/articles", func(r chi.Router) {
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r.With(paginate).Get("/", listArticles) // GET /articles
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r.With(paginate).Get("/{month}-{day}-{year}", listArticlesByDate) // GET /articles/01-16-2017
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r.Post("/", createArticle) // POST /articles
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r.Get("/search", searchArticles) // GET /articles/search
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// Regexp url parameters:
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r.Get("/{articleSlug:[a-z-]+}", getArticleBySlug) // GET /articles/home-is-toronto
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// Subrouters:
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r.Route("/{articleID}", func(r chi.Router) {
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r.Use(ArticleCtx)
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r.Get("/", getArticle) // GET /articles/123
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r.Put("/", updateArticle) // PUT /articles/123
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r.Delete("/", deleteArticle) // DELETE /articles/123
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})
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})
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// Mount the admin sub-router
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r.Mount("/admin", adminRouter())
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http.ListenAndServe(":3333", r)
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}
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func ArticleCtx(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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articleID := chi.URLParam(r, "articleID")
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article, err := dbGetArticle(articleID)
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if err != nil {
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http.Error(w, http.StatusText(404), 404)
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return
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}
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ctx := context.WithValue(r.Context(), "article", article)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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func getArticle(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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article, ok := ctx.Value("article").(*Article)
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if !ok {
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http.Error(w, http.StatusText(422), 422)
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return
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}
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w.Write([]byte(fmt.Sprintf("title:%s", article.Title)))
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}
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// A completely separate router for administrator routes
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func adminRouter() http.Handler {
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r := chi.NewRouter()
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r.Use(AdminOnly)
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r.Get("/", adminIndex)
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r.Get("/accounts", adminListAccounts)
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return r
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}
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func AdminOnly(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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perm, ok := ctx.Value("acl.permission").(YourPermissionType)
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if !ok || !perm.IsAdmin() {
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http.Error(w, http.StatusText(403), 403)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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```
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## Router design
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chi's router is based on a kind of [Patricia Radix trie](https://en.wikipedia.org/wiki/Radix_tree).
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The router is fully compatible with `net/http`.
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Built on top of the tree is the `Router` interface:
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```go
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// Router consisting of the core routing methods used by chi's Mux,
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// using only the standard net/http.
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type Router interface {
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http.Handler
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Routes
|
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|
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// Use appends one of more middlewares onto the Router stack.
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Use(middlewares ...func(http.Handler) http.Handler)
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// With adds inline middlewares for an endpoint handler.
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With(middlewares ...func(http.Handler) http.Handler) Router
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// Group adds a new inline-Router along the current routing
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// path, with a fresh middleware stack for the inline-Router.
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Group(fn func(r Router)) Router
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// Route mounts a sub-Router along a `pattern`` string.
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Route(pattern string, fn func(r Router)) Router
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// Mount attaches another http.Handler along ./pattern/*
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Mount(pattern string, h http.Handler)
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// Handle and HandleFunc adds routes for `pattern` that matches
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// all HTTP methods.
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Handle(pattern string, h http.Handler)
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HandleFunc(pattern string, h http.HandlerFunc)
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|
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// Method and MethodFunc adds routes for `pattern` that matches
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// the `method` HTTP method.
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Method(method, pattern string, h http.Handler)
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MethodFunc(method, pattern string, h http.HandlerFunc)
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|
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// HTTP-method routing along `pattern`
|
||||
Connect(pattern string, h http.HandlerFunc)
|
||||
Delete(pattern string, h http.HandlerFunc)
|
||||
Get(pattern string, h http.HandlerFunc)
|
||||
Head(pattern string, h http.HandlerFunc)
|
||||
Options(pattern string, h http.HandlerFunc)
|
||||
Patch(pattern string, h http.HandlerFunc)
|
||||
Post(pattern string, h http.HandlerFunc)
|
||||
Put(pattern string, h http.HandlerFunc)
|
||||
Trace(pattern string, h http.HandlerFunc)
|
||||
|
||||
// NotFound defines a handler to respond whenever a route could
|
||||
// not be found.
|
||||
NotFound(h http.HandlerFunc)
|
||||
|
||||
// MethodNotAllowed defines a handler to respond whenever a method is
|
||||
// not allowed.
|
||||
MethodNotAllowed(h http.HandlerFunc)
|
||||
}
|
||||
|
||||
// Routes interface adds two methods for router traversal, which is also
|
||||
// used by the github.com/go-chi/docgen package to generate documentation for Routers.
|
||||
type Routes interface {
|
||||
// Routes returns the routing tree in an easily traversable structure.
|
||||
Routes() []Route
|
||||
|
||||
// Middlewares returns the list of middlewares in use by the router.
|
||||
Middlewares() Middlewares
|
||||
|
||||
// Match searches the routing tree for a handler that matches
|
||||
// the method/path - similar to routing a http request, but without
|
||||
// executing the handler thereafter.
|
||||
Match(rctx *Context, method, path string) bool
|
||||
}
|
||||
```
|
||||
|
||||
Each routing method accepts a URL `pattern` and chain of `handlers`. The URL pattern
|
||||
supports named params (ie. `/users/{userID}`) and wildcards (ie. `/admin/*`). URL parameters
|
||||
can be fetched at runtime by calling `chi.URLParam(r, "userID")` for named parameters
|
||||
and `chi.URLParam(r, "*")` for a wildcard parameter.
|
||||
|
||||
|
||||
### Middleware handlers
|
||||
|
||||
chi's middlewares are just stdlib net/http middleware handlers. There is nothing special
|
||||
about them, which means the router and all the tooling is designed to be compatible and
|
||||
friendly with any middleware in the community. This offers much better extensibility and reuse
|
||||
of packages and is at the heart of chi's purpose.
|
||||
|
||||
Here is an example of a standard net/http middleware handler using the new request context
|
||||
available in Go. This middleware sets a hypothetical user identifier on the request
|
||||
context and calls the next handler in the chain.
|
||||
|
||||
```go
|
||||
// HTTP middleware setting a value on the request context
|
||||
func MyMiddleware(next http.Handler) http.Handler {
|
||||
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
ctx := context.WithValue(r.Context(), "user", "123")
|
||||
next.ServeHTTP(w, r.WithContext(ctx))
|
||||
})
|
||||
}
|
||||
```
|
||||
|
||||
|
||||
### Request handlers
|
||||
|
||||
chi uses standard net/http request handlers. This little snippet is an example of a http.Handler
|
||||
func that reads a user identifier from the request context - hypothetically, identifying
|
||||
the user sending an authenticated request, validated+set by a previous middleware handler.
|
||||
|
||||
```go
|
||||
// HTTP handler accessing data from the request context.
|
||||
func MyRequestHandler(w http.ResponseWriter, r *http.Request) {
|
||||
user := r.Context().Value("user").(string)
|
||||
w.Write([]byte(fmt.Sprintf("hi %s", user)))
|
||||
}
|
||||
```
|
||||
|
||||
|
||||
### URL parameters
|
||||
|
||||
chi's router parses and stores URL parameters right onto the request context. Here is
|
||||
an example of how to access URL params in your net/http handlers. And of course, middlewares
|
||||
are able to access the same information.
|
||||
|
||||
```go
|
||||
// HTTP handler accessing the url routing parameters.
|
||||
func MyRequestHandler(w http.ResponseWriter, r *http.Request) {
|
||||
userID := chi.URLParam(r, "userID") // from a route like /users/{userID}
|
||||
|
||||
ctx := r.Context()
|
||||
key := ctx.Value("key").(string)
|
||||
|
||||
w.Write([]byte(fmt.Sprintf("hi %v, %v", userID, key)))
|
||||
}
|
||||
```
|
||||
|
||||
|
||||
## Middlewares
|
||||
|
||||
chi comes equipped with an optional `middleware` package, providing a suite of standard
|
||||
`net/http` middlewares. Please note, any middleware in the ecosystem that is also compatible
|
||||
with `net/http` can be used with chi's mux.
|
||||
|
||||
### Core middlewares
|
||||
|
||||
-----------------------------------------------------------------------------------------------------------
|
||||
| chi/middleware Handler | description |
|
||||
|:----------------------|:---------------------------------------------------------------------------------
|
||||
| AllowContentType | Explicit whitelist of accepted request Content-Types |
|
||||
| Compress | Gzip compression for clients that accept compressed responses |
|
||||
| GetHead | Automatically route undefined HEAD requests to GET handlers |
|
||||
| Heartbeat | Monitoring endpoint to check the servers pulse |
|
||||
| Logger | Logs the start and end of each request with the elapsed processing time |
|
||||
| NoCache | Sets response headers to prevent clients from caching |
|
||||
| Profiler | Easily attach net/http/pprof to your routers |
|
||||
| RealIP | Sets a http.Request's RemoteAddr to either X-Forwarded-For or X-Real-IP |
|
||||
| Recoverer | Gracefully absorb panics and prints the stack trace |
|
||||
| RequestID | Injects a request ID into the context of each request |
|
||||
| RedirectSlashes | Redirect slashes on routing paths |
|
||||
| SetHeader | Short-hand middleware to set a response header key/value |
|
||||
| StripSlashes | Strip slashes on routing paths |
|
||||
| Throttle | Puts a ceiling on the number of concurrent requests |
|
||||
| Timeout | Signals to the request context when the timeout deadline is reached |
|
||||
| URLFormat | Parse extension from url and put it on request context |
|
||||
| WithValue | Short-hand middleware to set a key/value on the request context |
|
||||
-----------------------------------------------------------------------------------------------------------
|
||||
|
||||
### Auxiliary middlewares & packages
|
||||
|
||||
Please see https://github.com/go-chi for additional packages.
|
||||
|
||||
--------------------------------------------------------------------------------------------------------------------
|
||||
| package | description |
|
||||
|:---------------------------------------------------|:-------------------------------------------------------------
|
||||
| [cors](https://github.com/go-chi/cors) | Cross-origin resource sharing (CORS) |
|
||||
| [docgen](https://github.com/go-chi/docgen) | Print chi.Router routes at runtime |
|
||||
| [jwtauth](https://github.com/go-chi/jwtauth) | JWT authentication |
|
||||
| [hostrouter](https://github.com/go-chi/hostrouter) | Domain/host based request routing |
|
||||
| [httpcoala](https://github.com/go-chi/httpcoala) | HTTP request coalescer |
|
||||
| [chi-authz](https://github.com/casbin/chi-authz) | Request ACL via https://github.com/hsluoyz/casbin |
|
||||
| [phi](https://github.com/fate-lovely/phi) | Port chi to [fasthttp](https://github.com/valyala/fasthttp) |
|
||||
--------------------------------------------------------------------------------------------------------------------
|
||||
|
||||
please [submit a PR](./CONTRIBUTING.md) if you'd like to include a link to a chi-compatible middleware
|
||||
|
||||
|
||||
## context?
|
||||
|
||||
`context` is a tiny pkg that provides simple interface to signal context across call stacks
|
||||
and goroutines. It was originally written by [Sameer Ajmani](https://github.com/Sajmani)
|
||||
and is available in stdlib since go1.7.
|
||||
|
||||
Learn more at https://blog.golang.org/context
|
||||
|
||||
and..
|
||||
* Docs: https://golang.org/pkg/context
|
||||
* Source: https://github.com/golang/go/tree/master/src/context
|
||||
|
||||
|
||||
## Benchmarks
|
||||
|
||||
The benchmark suite: https://github.com/pkieltyka/go-http-routing-benchmark
|
||||
|
||||
Results as of Jan 9, 2019 with Go 1.11.4 on Linux X1 Carbon laptop
|
||||
|
||||
```shell
|
||||
BenchmarkChi_Param 3000000 475 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_Param5 2000000 696 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_Param20 1000000 1275 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_ParamWrite 3000000 505 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_GithubStatic 3000000 508 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_GithubParam 2000000 669 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_GithubAll 10000 134627 ns/op 87699 B/op 609 allocs/op
|
||||
BenchmarkChi_GPlusStatic 3000000 402 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_GPlusParam 3000000 500 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_GPlus2Params 3000000 586 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_GPlusAll 200000 7237 ns/op 5616 B/op 39 allocs/op
|
||||
BenchmarkChi_ParseStatic 3000000 408 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_ParseParam 3000000 488 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_Parse2Params 3000000 551 ns/op 432 B/op 3 allocs/op
|
||||
BenchmarkChi_ParseAll 100000 13508 ns/op 11232 B/op 78 allocs/op
|
||||
BenchmarkChi_StaticAll 20000 81933 ns/op 67826 B/op 471 allocs/op
|
||||
```
|
||||
|
||||
Comparison with other routers: https://gist.github.com/pkieltyka/123032f12052520aaccab752bd3e78cc
|
||||
|
||||
NOTE: the allocs in the benchmark above are from the calls to http.Request's
|
||||
`WithContext(context.Context)` method that clones the http.Request, sets the `Context()`
|
||||
on the duplicated (alloc'd) request and returns it the new request object. This is just
|
||||
how setting context on a request in Go works.
|
||||
|
||||
|
||||
## Credits
|
||||
|
||||
* Carl Jackson for https://github.com/zenazn/goji
|
||||
* Parts of chi's thinking comes from goji, and chi's middleware package
|
||||
sources from goji.
|
||||
* Armon Dadgar for https://github.com/armon/go-radix
|
||||
* Contributions: [@VojtechVitek](https://github.com/VojtechVitek)
|
||||
|
||||
We'll be more than happy to see [your contributions](./CONTRIBUTING.md)!
|
||||
|
||||
|
||||
## Beyond REST
|
||||
|
||||
chi is just a http router that lets you decompose request handling into many smaller layers.
|
||||
Many companies including Pressly.com (of course) use chi to write REST services for their public
|
||||
APIs. But, REST is just a convention for managing state via HTTP, and there's a lot of other pieces
|
||||
required to write a complete client-server system or network of microservices.
|
||||
|
||||
Looking ahead beyond REST, I also recommend some newer works in the field coming from
|
||||
[gRPC](https://github.com/grpc/grpc-go), [NATS](https://nats.io), [go-kit](https://github.com/go-kit/kit)
|
||||
and even [graphql](https://github.com/graphql-go/graphql). They're all pretty cool with their
|
||||
own unique approaches and benefits. Specifically, I'd look at gRPC since it makes client-server
|
||||
communication feel like a single program on a single computer, no need to hand-write a client library
|
||||
and the request/response payloads are typed contracts. NATS is pretty amazing too as a super
|
||||
fast and lightweight pub-sub transport that can speak protobufs, with nice service discovery -
|
||||
an excellent combination with gRPC.
|
||||
|
||||
|
||||
## License
|
||||
|
||||
Copyright (c) 2015-present [Peter Kieltyka](https://github.com/pkieltyka)
|
||||
|
||||
Licensed under [MIT License](./LICENSE)
|
||||
|
||||
[GoDoc]: https://godoc.org/github.com/go-chi/chi
|
||||
[GoDoc Widget]: https://godoc.org/github.com/go-chi/chi?status.svg
|
||||
[Travis]: https://travis-ci.org/go-chi/chi
|
||||
[Travis Widget]: https://travis-ci.org/go-chi/chi.svg?branch=master
|
||||
|
|
@ -0,0 +1,49 @@
|
|||
package chi
|
||||
|
||||
import "net/http"
|
||||
|
||||
// Chain returns a Middlewares type from a slice of middleware handlers.
|
||||
func Chain(middlewares ...func(http.Handler) http.Handler) Middlewares {
|
||||
return Middlewares(middlewares)
|
||||
}
|
||||
|
||||
// Handler builds and returns a http.Handler from the chain of middlewares,
|
||||
// with `h http.Handler` as the final handler.
|
||||
func (mws Middlewares) Handler(h http.Handler) http.Handler {
|
||||
return &ChainHandler{mws, h, chain(mws, h)}
|
||||
}
|
||||
|
||||
// HandlerFunc builds and returns a http.Handler from the chain of middlewares,
|
||||
// with `h http.Handler` as the final handler.
|
||||
func (mws Middlewares) HandlerFunc(h http.HandlerFunc) http.Handler {
|
||||
return &ChainHandler{mws, h, chain(mws, h)}
|
||||
}
|
||||
|
||||
// ChainHandler is a http.Handler with support for handler composition and
|
||||
// execution.
|
||||
type ChainHandler struct {
|
||||
Middlewares Middlewares
|
||||
Endpoint http.Handler
|
||||
chain http.Handler
|
||||
}
|
||||
|
||||
func (c *ChainHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
c.chain.ServeHTTP(w, r)
|
||||
}
|
||||
|
||||
// chain builds a http.Handler composed of an inline middleware stack and endpoint
|
||||
// handler in the order they are passed.
|
||||
func chain(middlewares []func(http.Handler) http.Handler, endpoint http.Handler) http.Handler {
|
||||
// Return ahead of time if there aren't any middlewares for the chain
|
||||
if len(middlewares) == 0 {
|
||||
return endpoint
|
||||
}
|
||||
|
||||
// Wrap the end handler with the middleware chain
|
||||
h := middlewares[len(middlewares)-1](endpoint)
|
||||
for i := len(middlewares) - 2; i >= 0; i-- {
|
||||
h = middlewares[i](h)
|
||||
}
|
||||
|
||||
return h
|
||||
}
|
||||
|
|
@ -0,0 +1,134 @@
|
|||
//
|
||||
// Package chi is a small, idiomatic and composable router for building HTTP services.
|
||||
//
|
||||
// chi requires Go 1.7 or newer.
|
||||
//
|
||||
// Example:
|
||||
// package main
|
||||
//
|
||||
// import (
|
||||
// "net/http"
|
||||
//
|
||||
// "github.com/go-chi/chi"
|
||||
// "github.com/go-chi/chi/middleware"
|
||||
// )
|
||||
//
|
||||
// func main() {
|
||||
// r := chi.NewRouter()
|
||||
// r.Use(middleware.Logger)
|
||||
// r.Use(middleware.Recoverer)
|
||||
//
|
||||
// r.Get("/", func(w http.ResponseWriter, r *http.Request) {
|
||||
// w.Write([]byte("root."))
|
||||
// })
|
||||
//
|
||||
// http.ListenAndServe(":3333", r)
|
||||
// }
|
||||
//
|
||||
// See github.com/go-chi/chi/_examples/ for more in-depth examples.
|
||||
//
|
||||
// URL patterns allow for easy matching of path components in HTTP
|
||||
// requests. The matching components can then be accessed using
|
||||
// chi.URLParam(). All patterns must begin with a slash.
|
||||
//
|
||||
// A simple named placeholder {name} matches any sequence of characters
|
||||
// up to the next / or the end of the URL. Trailing slashes on paths must
|
||||
// be handled explicitly.
|
||||
//
|
||||
// A placeholder with a name followed by a colon allows a regular
|
||||
// expression match, for example {number:\\d+}. The regular expression
|
||||
// syntax is Go's normal regexp RE2 syntax, except that regular expressions
|
||||
// including { or } are not supported, and / will never be
|
||||
// matched. An anonymous regexp pattern is allowed, using an empty string
|
||||
// before the colon in the placeholder, such as {:\\d+}
|
||||
//
|
||||
// The special placeholder of asterisk matches the rest of the requested
|
||||
// URL. Any trailing characters in the pattern are ignored. This is the only
|
||||
// placeholder which will match / characters.
|
||||
//
|
||||
// Examples:
|
||||
// "/user/{name}" matches "/user/jsmith" but not "/user/jsmith/info" or "/user/jsmith/"
|
||||
// "/user/{name}/info" matches "/user/jsmith/info"
|
||||
// "/page/*" matches "/page/intro/latest"
|
||||
// "/page/*/index" also matches "/page/intro/latest"
|
||||
// "/date/{yyyy:\\d\\d\\d\\d}/{mm:\\d\\d}/{dd:\\d\\d}" matches "/date/2017/04/01"
|
||||
//
|
||||
package chi
|
||||
|
||||
import "net/http"
|
||||
|
||||
// NewRouter returns a new Mux object that implements the Router interface.
|
||||
func NewRouter() *Mux {
|
||||
return NewMux()
|
||||
}
|
||||
|
||||
// Router consisting of the core routing methods used by chi's Mux,
|
||||
// using only the standard net/http.
|
||||
type Router interface {
|
||||
http.Handler
|
||||
Routes
|
||||
|
||||
// Use appends one of more middlewares onto the Router stack.
|
||||
Use(middlewares ...func(http.Handler) http.Handler)
|
||||
|
||||
// With adds inline middlewares for an endpoint handler.
|
||||
With(middlewares ...func(http.Handler) http.Handler) Router
|
||||
|
||||
// Group adds a new inline-Router along the current routing
|
||||
// path, with a fresh middleware stack for the inline-Router.
|
||||
Group(fn func(r Router)) Router
|
||||
|
||||
// Route mounts a sub-Router along a `pattern`` string.
|
||||
Route(pattern string, fn func(r Router)) Router
|
||||
|
||||
// Mount attaches another http.Handler along ./pattern/*
|
||||
Mount(pattern string, h http.Handler)
|
||||
|
||||
// Handle and HandleFunc adds routes for `pattern` that matches
|
||||
// all HTTP methods.
|
||||
Handle(pattern string, h http.Handler)
|
||||
HandleFunc(pattern string, h http.HandlerFunc)
|
||||
|
||||
// Method and MethodFunc adds routes for `pattern` that matches
|
||||
// the `method` HTTP method.
|
||||
Method(method, pattern string, h http.Handler)
|
||||
MethodFunc(method, pattern string, h http.HandlerFunc)
|
||||
|
||||
// HTTP-method routing along `pattern`
|
||||
Connect(pattern string, h http.HandlerFunc)
|
||||
Delete(pattern string, h http.HandlerFunc)
|
||||
Get(pattern string, h http.HandlerFunc)
|
||||
Head(pattern string, h http.HandlerFunc)
|
||||
Options(pattern string, h http.HandlerFunc)
|
||||
Patch(pattern string, h http.HandlerFunc)
|
||||
Post(pattern string, h http.HandlerFunc)
|
||||
Put(pattern string, h http.HandlerFunc)
|
||||
Trace(pattern string, h http.HandlerFunc)
|
||||
|
||||
// NotFound defines a handler to respond whenever a route could
|
||||
// not be found.
|
||||
NotFound(h http.HandlerFunc)
|
||||
|
||||
// MethodNotAllowed defines a handler to respond whenever a method is
|
||||
// not allowed.
|
||||
MethodNotAllowed(h http.HandlerFunc)
|
||||
}
|
||||
|
||||
// Routes interface adds two methods for router traversal, which is also
|
||||
// used by the `docgen` subpackage to generation documentation for Routers.
|
||||
type Routes interface {
|
||||
// Routes returns the routing tree in an easily traversable structure.
|
||||
Routes() []Route
|
||||
|
||||
// Middlewares returns the list of middlewares in use by the router.
|
||||
Middlewares() Middlewares
|
||||
|
||||
// Match searches the routing tree for a handler that matches
|
||||
// the method/path - similar to routing a http request, but without
|
||||
// executing the handler thereafter.
|
||||
Match(rctx *Context, method, path string) bool
|
||||
}
|
||||
|
||||
// Middlewares type is a slice of standard middleware handlers with methods
|
||||
// to compose middleware chains and http.Handler's.
|
||||
type Middlewares []func(http.Handler) http.Handler
|
||||
|
|
@ -0,0 +1,161 @@
|
|||
package chi
|
||||
|
||||
import (
|
||||
"context"
|
||||
"net"
|
||||
"net/http"
|
||||
"strings"
|
||||
)
|
||||
|
||||
var (
|
||||
// RouteCtxKey is the context.Context key to store the request context.
|
||||
RouteCtxKey = &contextKey{"RouteContext"}
|
||||
)
|
||||
|
||||
// Context is the default routing context set on the root node of a
|
||||
// request context to track route patterns, URL parameters and
|
||||
// an optional routing path.
|
||||
type Context struct {
|
||||
Routes Routes
|
||||
|
||||
// Routing path/method override used during the route search.
|
||||
// See Mux#routeHTTP method.
|
||||
RoutePath string
|
||||
RouteMethod string
|
||||
|
||||
// Routing pattern stack throughout the lifecycle of the request,
|
||||
// across all connected routers. It is a record of all matching
|
||||
// patterns across a stack of sub-routers.
|
||||
RoutePatterns []string
|
||||
|
||||
// URLParams are the stack of routeParams captured during the
|
||||
// routing lifecycle across a stack of sub-routers.
|
||||
URLParams RouteParams
|
||||
|
||||
// The endpoint routing pattern that matched the request URI path
|
||||
// or `RoutePath` of the current sub-router. This value will update
|
||||
// during the lifecycle of a request passing through a stack of
|
||||
// sub-routers.
|
||||
routePattern string
|
||||
|
||||
// Route parameters matched for the current sub-router. It is
|
||||
// intentionally unexported so it cant be tampered.
|
||||
routeParams RouteParams
|
||||
|
||||
// methodNotAllowed hint
|
||||
methodNotAllowed bool
|
||||
}
|
||||
|
||||
// NewRouteContext returns a new routing Context object.
|
||||
func NewRouteContext() *Context {
|
||||
return &Context{}
|
||||
}
|
||||
|
||||
// Reset a routing context to its initial state.
|
||||
func (x *Context) Reset() {
|
||||
x.Routes = nil
|
||||
x.RoutePath = ""
|
||||
x.RouteMethod = ""
|
||||
x.RoutePatterns = x.RoutePatterns[:0]
|
||||
x.URLParams.Keys = x.URLParams.Keys[:0]
|
||||
x.URLParams.Values = x.URLParams.Values[:0]
|
||||
|
||||
x.routePattern = ""
|
||||
x.routeParams.Keys = x.routeParams.Keys[:0]
|
||||
x.routeParams.Values = x.routeParams.Values[:0]
|
||||
x.methodNotAllowed = false
|
||||
}
|
||||
|
||||
// URLParam returns the corresponding URL parameter value from the request
|
||||
// routing context.
|
||||
func (x *Context) URLParam(key string) string {
|
||||
for k := len(x.URLParams.Keys) - 1; k >= 0; k-- {
|
||||
if x.URLParams.Keys[k] == key {
|
||||
return x.URLParams.Values[k]
|
||||
}
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
// RoutePattern builds the routing pattern string for the particular
|
||||
// request, at the particular point during routing. This means, the value
|
||||
// will change throughout the execution of a request in a router. That is
|
||||
// why its advised to only use this value after calling the next handler.
|
||||
//
|
||||
// For example,
|
||||
//
|
||||
// func Instrument(next http.Handler) http.Handler {
|
||||
// return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
// next.ServeHTTP(w, r)
|
||||
// routePattern := chi.RouteContext(r.Context()).RoutePattern()
|
||||
// measure(w, r, routePattern)
|
||||
// })
|
||||
// }
|
||||
func (x *Context) RoutePattern() string {
|
||||
routePattern := strings.Join(x.RoutePatterns, "")
|
||||
return strings.Replace(routePattern, "/*/", "/", -1)
|
||||
}
|
||||
|
||||
// RouteContext returns chi's routing Context object from a
|
||||
// http.Request Context.
|
||||
func RouteContext(ctx context.Context) *Context {
|
||||
return ctx.Value(RouteCtxKey).(*Context)
|
||||
}
|
||||
|
||||
// URLParam returns the url parameter from a http.Request object.
|
||||
func URLParam(r *http.Request, key string) string {
|
||||
if rctx := RouteContext(r.Context()); rctx != nil {
|
||||
return rctx.URLParam(key)
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
// URLParamFromCtx returns the url parameter from a http.Request Context.
|
||||
func URLParamFromCtx(ctx context.Context, key string) string {
|
||||
if rctx := RouteContext(ctx); rctx != nil {
|
||||
return rctx.URLParam(key)
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
// RouteParams is a structure to track URL routing parameters efficiently.
|
||||
type RouteParams struct {
|
||||
Keys, Values []string
|
||||
}
|
||||
|
||||
// Add will append a URL parameter to the end of the route param
|
||||
func (s *RouteParams) Add(key, value string) {
|
||||
(*s).Keys = append((*s).Keys, key)
|
||||
(*s).Values = append((*s).Values, value)
|
||||
}
|
||||
|
||||
// ServerBaseContext wraps an http.Handler to set the request context to the
|
||||
// `baseCtx`.
|
||||
func ServerBaseContext(baseCtx context.Context, h http.Handler) http.Handler {
|
||||
fn := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
ctx := r.Context()
|
||||
baseCtx := baseCtx
|
||||
|
||||
// Copy over default net/http server context keys
|
||||
if v, ok := ctx.Value(http.ServerContextKey).(*http.Server); ok {
|
||||
baseCtx = context.WithValue(baseCtx, http.ServerContextKey, v)
|
||||
}
|
||||
if v, ok := ctx.Value(http.LocalAddrContextKey).(net.Addr); ok {
|
||||
baseCtx = context.WithValue(baseCtx, http.LocalAddrContextKey, v)
|
||||
}
|
||||
|
||||
h.ServeHTTP(w, r.WithContext(baseCtx))
|
||||
})
|
||||
return fn
|
||||
}
|
||||
|
||||
// contextKey is a value for use with context.WithValue. It's used as
|
||||
// a pointer so it fits in an interface{} without allocation. This technique
|
||||
// for defining context keys was copied from Go 1.7's new use of context in net/http.
|
||||
type contextKey struct {
|
||||
name string
|
||||
}
|
||||
|
||||
func (k *contextKey) String() string {
|
||||
return "chi context value " + k.name
|
||||
}
|
||||
|
|
@ -0,0 +1,460 @@
|
|||
package chi
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"net/http"
|
||||
"strings"
|
||||
"sync"
|
||||
)
|
||||
|
||||
var _ Router = &Mux{}
|
||||
|
||||
// Mux is a simple HTTP route multiplexer that parses a request path,
|
||||
// records any URL params, and executes an end handler. It implements
|
||||
// the http.Handler interface and is friendly with the standard library.
|
||||
//
|
||||
// Mux is designed to be fast, minimal and offer a powerful API for building
|
||||
// modular and composable HTTP services with a large set of handlers. It's
|
||||
// particularly useful for writing large REST API services that break a handler
|
||||
// into many smaller parts composed of middlewares and end handlers.
|
||||
type Mux struct {
|
||||
// The radix trie router
|
||||
tree *node
|
||||
|
||||
// The middleware stack
|
||||
middlewares []func(http.Handler) http.Handler
|
||||
|
||||
// Controls the behaviour of middleware chain generation when a mux
|
||||
// is registered as an inline group inside another mux.
|
||||
inline bool
|
||||
parent *Mux
|
||||
|
||||
// The computed mux handler made of the chained middleware stack and
|
||||
// the tree router
|
||||
handler http.Handler
|
||||
|
||||
// Routing context pool
|
||||
pool *sync.Pool
|
||||
|
||||
// Custom route not found handler
|
||||
notFoundHandler http.HandlerFunc
|
||||
|
||||
// Custom method not allowed handler
|
||||
methodNotAllowedHandler http.HandlerFunc
|
||||
}
|
||||
|
||||
// NewMux returns a newly initialized Mux object that implements the Router
|
||||
// interface.
|
||||
func NewMux() *Mux {
|
||||
mux := &Mux{tree: &node{}, pool: &sync.Pool{}}
|
||||
mux.pool.New = func() interface{} {
|
||||
return NewRouteContext()
|
||||
}
|
||||
return mux
|
||||
}
|
||||
|
||||
// ServeHTTP is the single method of the http.Handler interface that makes
|
||||
// Mux interoperable with the standard library. It uses a sync.Pool to get and
|
||||
// reuse routing contexts for each request.
|
||||
func (mx *Mux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
// Ensure the mux has some routes defined on the mux
|
||||
if mx.handler == nil {
|
||||
mx.NotFoundHandler().ServeHTTP(w, r)
|
||||
return
|
||||
}
|
||||
|
||||
// Check if a routing context already exists from a parent router.
|
||||
rctx, _ := r.Context().Value(RouteCtxKey).(*Context)
|
||||
if rctx != nil {
|
||||
mx.handler.ServeHTTP(w, r)
|
||||
return
|
||||
}
|
||||
|
||||
// Fetch a RouteContext object from the sync pool, and call the computed
|
||||
// mx.handler that is comprised of mx.middlewares + mx.routeHTTP.
|
||||
// Once the request is finished, reset the routing context and put it back
|
||||
// into the pool for reuse from another request.
|
||||
rctx = mx.pool.Get().(*Context)
|
||||
rctx.Reset()
|
||||
rctx.Routes = mx
|
||||
r = r.WithContext(context.WithValue(r.Context(), RouteCtxKey, rctx))
|
||||
mx.handler.ServeHTTP(w, r)
|
||||
mx.pool.Put(rctx)
|
||||
}
|
||||
|
||||
// Use appends a middleware handler to the Mux middleware stack.
|
||||
//
|
||||
// The middleware stack for any Mux will execute before searching for a matching
|
||||
// route to a specific handler, which provides opportunity to respond early,
|
||||
// change the course of the request execution, or set request-scoped values for
|
||||
// the next http.Handler.
|
||||
func (mx *Mux) Use(middlewares ...func(http.Handler) http.Handler) {
|
||||
if mx.handler != nil {
|
||||
panic("chi: all middlewares must be defined before routes on a mux")
|
||||
}
|
||||
mx.middlewares = append(mx.middlewares, middlewares...)
|
||||
}
|
||||
|
||||
// Handle adds the route `pattern` that matches any http method to
|
||||
// execute the `handler` http.Handler.
|
||||
func (mx *Mux) Handle(pattern string, handler http.Handler) {
|
||||
mx.handle(mALL, pattern, handler)
|
||||
}
|
||||
|
||||
// HandleFunc adds the route `pattern` that matches any http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) HandleFunc(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mALL, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Method adds the route `pattern` that matches `method` http method to
|
||||
// execute the `handler` http.Handler.
|
||||
func (mx *Mux) Method(method, pattern string, handler http.Handler) {
|
||||
m, ok := methodMap[strings.ToUpper(method)]
|
||||
if !ok {
|
||||
panic(fmt.Sprintf("chi: '%s' http method is not supported.", method))
|
||||
}
|
||||
mx.handle(m, pattern, handler)
|
||||
}
|
||||
|
||||
// MethodFunc adds the route `pattern` that matches `method` http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) MethodFunc(method, pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.Method(method, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Connect adds the route `pattern` that matches a CONNECT http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Connect(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mCONNECT, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Delete adds the route `pattern` that matches a DELETE http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Delete(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mDELETE, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Get adds the route `pattern` that matches a GET http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Get(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mGET, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Head adds the route `pattern` that matches a HEAD http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Head(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mHEAD, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Options adds the route `pattern` that matches a OPTIONS http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Options(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mOPTIONS, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Patch adds the route `pattern` that matches a PATCH http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Patch(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mPATCH, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Post adds the route `pattern` that matches a POST http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Post(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mPOST, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Put adds the route `pattern` that matches a PUT http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Put(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mPUT, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// Trace adds the route `pattern` that matches a TRACE http method to
|
||||
// execute the `handlerFn` http.HandlerFunc.
|
||||
func (mx *Mux) Trace(pattern string, handlerFn http.HandlerFunc) {
|
||||
mx.handle(mTRACE, pattern, handlerFn)
|
||||
}
|
||||
|
||||
// NotFound sets a custom http.HandlerFunc for routing paths that could
|
||||
// not be found. The default 404 handler is `http.NotFound`.
|
||||
func (mx *Mux) NotFound(handlerFn http.HandlerFunc) {
|
||||
// Build NotFound handler chain
|
||||
m := mx
|
||||
hFn := handlerFn
|
||||
if mx.inline && mx.parent != nil {
|
||||
m = mx.parent
|
||||
hFn = Chain(mx.middlewares...).HandlerFunc(hFn).ServeHTTP
|
||||
}
|
||||
|
||||
// Update the notFoundHandler from this point forward
|
||||
m.notFoundHandler = hFn
|
||||
m.updateSubRoutes(func(subMux *Mux) {
|
||||
if subMux.notFoundHandler == nil {
|
||||
subMux.NotFound(hFn)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
// MethodNotAllowed sets a custom http.HandlerFunc for routing paths where the
|
||||
// method is unresolved. The default handler returns a 405 with an empty body.
|
||||
func (mx *Mux) MethodNotAllowed(handlerFn http.HandlerFunc) {
|
||||
// Build MethodNotAllowed handler chain
|
||||
m := mx
|
||||
hFn := handlerFn
|
||||
if mx.inline && mx.parent != nil {
|
||||
m = mx.parent
|
||||
hFn = Chain(mx.middlewares...).HandlerFunc(hFn).ServeHTTP
|
||||
}
|
||||
|
||||
// Update the methodNotAllowedHandler from this point forward
|
||||
m.methodNotAllowedHandler = hFn
|
||||
m.updateSubRoutes(func(subMux *Mux) {
|
||||
if subMux.methodNotAllowedHandler == nil {
|
||||
subMux.MethodNotAllowed(hFn)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
// With adds inline middlewares for an endpoint handler.
|
||||
func (mx *Mux) With(middlewares ...func(http.Handler) http.Handler) Router {
|
||||
// Similarly as in handle(), we must build the mux handler once further
|
||||
// middleware registration isn't allowed for this stack, like now.
|
||||
if !mx.inline && mx.handler == nil {
|
||||
mx.buildRouteHandler()
|
||||
}
|
||||
|
||||
// Copy middlewares from parent inline muxs
|
||||
var mws Middlewares
|
||||
if mx.inline {
|
||||
mws = make(Middlewares, len(mx.middlewares))
|
||||
copy(mws, mx.middlewares)
|
||||
}
|
||||
mws = append(mws, middlewares...)
|
||||
|
||||
im := &Mux{pool: mx.pool, inline: true, parent: mx, tree: mx.tree, middlewares: mws}
|
||||
|
||||
return im
|
||||
}
|
||||
|
||||
// Group creates a new inline-Mux with a fresh middleware stack. It's useful
|
||||
// for a group of handlers along the same routing path that use an additional
|
||||
// set of middlewares. See _examples/.
|
||||
func (mx *Mux) Group(fn func(r Router)) Router {
|
||||
im := mx.With().(*Mux)
|
||||
if fn != nil {
|
||||
fn(im)
|
||||
}
|
||||
return im
|
||||
}
|
||||
|
||||
// Route creates a new Mux with a fresh middleware stack and mounts it
|
||||
// along the `pattern` as a subrouter. Effectively, this is a short-hand
|
||||
// call to Mount. See _examples/.
|
||||
func (mx *Mux) Route(pattern string, fn func(r Router)) Router {
|
||||
subRouter := NewRouter()
|
||||
if fn != nil {
|
||||
fn(subRouter)
|
||||
}
|
||||
mx.Mount(pattern, subRouter)
|
||||
return subRouter
|
||||
}
|
||||
|
||||
// Mount attaches another http.Handler or chi Router as a subrouter along a routing
|
||||
// path. It's very useful to split up a large API as many independent routers and
|
||||
// compose them as a single service using Mount. See _examples/.
|
||||
//
|
||||
// Note that Mount() simply sets a wildcard along the `pattern` that will continue
|
||||
// routing at the `handler`, which in most cases is another chi.Router. As a result,
|
||||
// if you define two Mount() routes on the exact same pattern the mount will panic.
|
||||
func (mx *Mux) Mount(pattern string, handler http.Handler) {
|
||||
// Provide runtime safety for ensuring a pattern isn't mounted on an existing
|
||||
// routing pattern.
|
||||
if mx.tree.findPattern(pattern+"*") || mx.tree.findPattern(pattern+"/*") {
|
||||
panic(fmt.Sprintf("chi: attempting to Mount() a handler on an existing path, '%s'", pattern))
|
||||
}
|
||||
|
||||
// Assign sub-Router's with the parent not found & method not allowed handler if not specified.
|
||||
subr, ok := handler.(*Mux)
|
||||
if ok && subr.notFoundHandler == nil && mx.notFoundHandler != nil {
|
||||
subr.NotFound(mx.notFoundHandler)
|
||||
}
|
||||
if ok && subr.methodNotAllowedHandler == nil && mx.methodNotAllowedHandler != nil {
|
||||
subr.MethodNotAllowed(mx.methodNotAllowedHandler)
|
||||
}
|
||||
|
||||
// Wrap the sub-router in a handlerFunc to scope the request path for routing.
|
||||
mountHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
rctx := RouteContext(r.Context())
|
||||
rctx.RoutePath = mx.nextRoutePath(rctx)
|
||||
handler.ServeHTTP(w, r)
|
||||
})
|
||||
|
||||
if pattern == "" || pattern[len(pattern)-1] != '/' {
|
||||
mx.handle(mALL|mSTUB, pattern, mountHandler)
|
||||
mx.handle(mALL|mSTUB, pattern+"/", mountHandler)
|
||||
pattern += "/"
|
||||
}
|
||||
|
||||
method := mALL
|
||||
subroutes, _ := handler.(Routes)
|
||||
if subroutes != nil {
|
||||
method |= mSTUB
|
||||
}
|
||||
n := mx.handle(method, pattern+"*", mountHandler)
|
||||
|
||||
if subroutes != nil {
|
||||
n.subroutes = subroutes
|
||||
}
|
||||
}
|
||||
|
||||
// Routes returns a slice of routing information from the tree,
|
||||
// useful for traversing available routes of a router.
|
||||
func (mx *Mux) Routes() []Route {
|
||||
return mx.tree.routes()
|
||||
}
|
||||
|
||||
// Middlewares returns a slice of middleware handler functions.
|
||||
func (mx *Mux) Middlewares() Middlewares {
|
||||
return mx.middlewares
|
||||
}
|
||||
|
||||
// Match searches the routing tree for a handler that matches the method/path.
|
||||
// It's similar to routing a http request, but without executing the handler
|
||||
// thereafter.
|
||||
//
|
||||
// Note: the *Context state is updated during execution, so manage
|
||||
// the state carefully or make a NewRouteContext().
|
||||
func (mx *Mux) Match(rctx *Context, method, path string) bool {
|
||||
m, ok := methodMap[method]
|
||||
if !ok {
|
||||
return false
|
||||
}
|
||||
|
||||
node, _, h := mx.tree.FindRoute(rctx, m, path)
|
||||
|
||||
if node != nil && node.subroutes != nil {
|
||||
rctx.RoutePath = mx.nextRoutePath(rctx)
|
||||
return node.subroutes.Match(rctx, method, rctx.RoutePath)
|
||||
}
|
||||
|
||||
return h != nil
|
||||
}
|
||||
|
||||
// NotFoundHandler returns the default Mux 404 responder whenever a route
|
||||
// cannot be found.
|
||||
func (mx *Mux) NotFoundHandler() http.HandlerFunc {
|
||||
if mx.notFoundHandler != nil {
|
||||
return mx.notFoundHandler
|
||||
}
|
||||
return http.NotFound
|
||||
}
|
||||
|
||||
// MethodNotAllowedHandler returns the default Mux 405 responder whenever
|
||||
// a method cannot be resolved for a route.
|
||||
func (mx *Mux) MethodNotAllowedHandler() http.HandlerFunc {
|
||||
if mx.methodNotAllowedHandler != nil {
|
||||
return mx.methodNotAllowedHandler
|
||||
}
|
||||
return methodNotAllowedHandler
|
||||
}
|
||||
|
||||
// buildRouteHandler builds the single mux handler that is a chain of the middleware
|
||||
// stack, as defined by calls to Use(), and the tree router (Mux) itself. After this
|
||||
// point, no other middlewares can be registered on this Mux's stack. But you can still
|
||||
// compose additional middlewares via Group()'s or using a chained middleware handler.
|
||||
func (mx *Mux) buildRouteHandler() {
|
||||
mx.handler = chain(mx.middlewares, http.HandlerFunc(mx.routeHTTP))
|
||||
}
|
||||
|
||||
// handle registers a http.Handler in the routing tree for a particular http method
|
||||
// and routing pattern.
|
||||
func (mx *Mux) handle(method methodTyp, pattern string, handler http.Handler) *node {
|
||||
if len(pattern) == 0 || pattern[0] != '/' {
|
||||
panic(fmt.Sprintf("chi: routing pattern must begin with '/' in '%s'", pattern))
|
||||
}
|
||||
|
||||
// Build the final routing handler for this Mux.
|
||||
if !mx.inline && mx.handler == nil {
|
||||
mx.buildRouteHandler()
|
||||
}
|
||||
|
||||
// Build endpoint handler with inline middlewares for the route
|
||||
var h http.Handler
|
||||
if mx.inline {
|
||||
mx.handler = http.HandlerFunc(mx.routeHTTP)
|
||||
h = Chain(mx.middlewares...).Handler(handler)
|
||||
} else {
|
||||
h = handler
|
||||
}
|
||||
|
||||
// Add the endpoint to the tree and return the node
|
||||
return mx.tree.InsertRoute(method, pattern, h)
|
||||
}
|
||||
|
||||
// routeHTTP routes a http.Request through the Mux routing tree to serve
|
||||
// the matching handler for a particular http method.
|
||||
func (mx *Mux) routeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
// Grab the route context object
|
||||
rctx := r.Context().Value(RouteCtxKey).(*Context)
|
||||
|
||||
// The request routing path
|
||||
routePath := rctx.RoutePath
|
||||
if routePath == "" {
|
||||
if r.URL.RawPath != "" {
|
||||
routePath = r.URL.RawPath
|
||||
} else {
|
||||
routePath = r.URL.Path
|
||||
}
|
||||
}
|
||||
|
||||
// Check if method is supported by chi
|
||||
if rctx.RouteMethod == "" {
|
||||
rctx.RouteMethod = r.Method
|
||||
}
|
||||
method, ok := methodMap[rctx.RouteMethod]
|
||||
if !ok {
|
||||
mx.MethodNotAllowedHandler().ServeHTTP(w, r)
|
||||
return
|
||||
}
|
||||
|
||||
// Find the route
|
||||
if _, _, h := mx.tree.FindRoute(rctx, method, routePath); h != nil {
|
||||
h.ServeHTTP(w, r)
|
||||
return
|
||||
}
|
||||
if rctx.methodNotAllowed {
|
||||
mx.MethodNotAllowedHandler().ServeHTTP(w, r)
|
||||
} else {
|
||||
mx.NotFoundHandler().ServeHTTP(w, r)
|
||||
}
|
||||
}
|
||||
|
||||
func (mx *Mux) nextRoutePath(rctx *Context) string {
|
||||
routePath := "/"
|
||||
nx := len(rctx.routeParams.Keys) - 1 // index of last param in list
|
||||
if nx >= 0 && rctx.routeParams.Keys[nx] == "*" && len(rctx.routeParams.Values) > nx {
|
||||
routePath += rctx.routeParams.Values[nx]
|
||||
}
|
||||
return routePath
|
||||
}
|
||||
|
||||
// Recursively update data on child routers.
|
||||
func (mx *Mux) updateSubRoutes(fn func(subMux *Mux)) {
|
||||
for _, r := range mx.tree.routes() {
|
||||
subMux, ok := r.SubRoutes.(*Mux)
|
||||
if !ok {
|
||||
continue
|
||||
}
|
||||
fn(subMux)
|
||||
}
|
||||
}
|
||||
|
||||
// methodNotAllowedHandler is a helper function to respond with a 405,
|
||||
// method not allowed.
|
||||
func methodNotAllowedHandler(w http.ResponseWriter, r *http.Request) {
|
||||
w.WriteHeader(405)
|
||||
w.Write(nil)
|
||||
}
|
||||
|
|
@ -0,0 +1,846 @@
|
|||
package chi
|
||||
|
||||
// Radix tree implementation below is a based on the original work by
|
||||
// Armon Dadgar in https://github.com/armon/go-radix/blob/master/radix.go
|
||||
// (MIT licensed). It's been heavily modified for use as a HTTP routing tree.
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"math"
|
||||
"net/http"
|
||||
"regexp"
|
||||
"sort"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
type methodTyp int
|
||||
|
||||
const (
|
||||
mSTUB methodTyp = 1 << iota
|
||||
mCONNECT
|
||||
mDELETE
|
||||
mGET
|
||||
mHEAD
|
||||
mOPTIONS
|
||||
mPATCH
|
||||
mPOST
|
||||
mPUT
|
||||
mTRACE
|
||||
)
|
||||
|
||||
var mALL = mCONNECT | mDELETE | mGET | mHEAD |
|
||||
mOPTIONS | mPATCH | mPOST | mPUT | mTRACE
|
||||
|
||||
var methodMap = map[string]methodTyp{
|
||||
http.MethodConnect: mCONNECT,
|
||||
http.MethodDelete: mDELETE,
|
||||
http.MethodGet: mGET,
|
||||
http.MethodHead: mHEAD,
|
||||
http.MethodOptions: mOPTIONS,
|
||||
http.MethodPatch: mPATCH,
|
||||
http.MethodPost: mPOST,
|
||||
http.MethodPut: mPUT,
|
||||
http.MethodTrace: mTRACE,
|
||||
}
|
||||
|
||||
// RegisterMethod adds support for custom HTTP method handlers, available
|
||||
// via Router#Method and Router#MethodFunc
|
||||
func RegisterMethod(method string) {
|
||||
if method == "" {
|
||||
return
|
||||
}
|
||||
method = strings.ToUpper(method)
|
||||
if _, ok := methodMap[method]; ok {
|
||||
return
|
||||
}
|
||||
n := len(methodMap)
|
||||
if n > strconv.IntSize {
|
||||
panic(fmt.Sprintf("chi: max number of methods reached (%d)", strconv.IntSize))
|
||||
}
|
||||
mt := methodTyp(math.Exp2(float64(n)))
|
||||
methodMap[method] = mt
|
||||
mALL |= mt
|
||||
}
|
||||
|
||||
type nodeTyp uint8
|
||||
|
||||
const (
|
||||
ntStatic nodeTyp = iota // /home
|
||||
ntRegexp // /{id:[0-9]+}
|
||||
ntParam // /{user}
|
||||
ntCatchAll // /api/v1/*
|
||||
)
|
||||
|
||||
type node struct {
|
||||
// node type: static, regexp, param, catchAll
|
||||
typ nodeTyp
|
||||
|
||||
// first byte of the prefix
|
||||
label byte
|
||||
|
||||
// first byte of the child prefix
|
||||
tail byte
|
||||
|
||||
// prefix is the common prefix we ignore
|
||||
prefix string
|
||||
|
||||
// regexp matcher for regexp nodes
|
||||
rex *regexp.Regexp
|
||||
|
||||
// HTTP handler endpoints on the leaf node
|
||||
endpoints endpoints
|
||||
|
||||
// subroutes on the leaf node
|
||||
subroutes Routes
|
||||
|
||||
// child nodes should be stored in-order for iteration,
|
||||
// in groups of the node type.
|
||||
children [ntCatchAll + 1]nodes
|
||||
}
|
||||
|
||||
// endpoints is a mapping of http method constants to handlers
|
||||
// for a given route.
|
||||
type endpoints map[methodTyp]*endpoint
|
||||
|
||||
type endpoint struct {
|
||||
// endpoint handler
|
||||
handler http.Handler
|
||||
|
||||
// pattern is the routing pattern for handler nodes
|
||||
pattern string
|
||||
|
||||
// parameter keys recorded on handler nodes
|
||||
paramKeys []string
|
||||
}
|
||||
|
||||
func (s endpoints) Value(method methodTyp) *endpoint {
|
||||
mh, ok := s[method]
|
||||
if !ok {
|
||||
mh = &endpoint{}
|
||||
s[method] = mh
|
||||
}
|
||||
return mh
|
||||
}
|
||||
|
||||
func (n *node) InsertRoute(method methodTyp, pattern string, handler http.Handler) *node {
|
||||
var parent *node
|
||||
search := pattern
|
||||
|
||||
for {
|
||||
// Handle key exhaustion
|
||||
if len(search) == 0 {
|
||||
// Insert or update the node's leaf handler
|
||||
n.setEndpoint(method, handler, pattern)
|
||||
return n
|
||||
}
|
||||
|
||||
// We're going to be searching for a wild node next,
|
||||
// in this case, we need to get the tail
|
||||
var label = search[0]
|
||||
var segTail byte
|
||||
var segEndIdx int
|
||||
var segTyp nodeTyp
|
||||
var segRexpat string
|
||||
if label == '{' || label == '*' {
|
||||
segTyp, _, segRexpat, segTail, _, segEndIdx = patNextSegment(search)
|
||||
}
|
||||
|
||||
var prefix string
|
||||
if segTyp == ntRegexp {
|
||||
prefix = segRexpat
|
||||
}
|
||||
|
||||
// Look for the edge to attach to
|
||||
parent = n
|
||||
n = n.getEdge(segTyp, label, segTail, prefix)
|
||||
|
||||
// No edge, create one
|
||||
if n == nil {
|
||||
child := &node{label: label, tail: segTail, prefix: search}
|
||||
hn := parent.addChild(child, search)
|
||||
hn.setEndpoint(method, handler, pattern)
|
||||
|
||||
return hn
|
||||
}
|
||||
|
||||
// Found an edge to match the pattern
|
||||
|
||||
if n.typ > ntStatic {
|
||||
// We found a param node, trim the param from the search path and continue.
|
||||
// This param/wild pattern segment would already be on the tree from a previous
|
||||
// call to addChild when creating a new node.
|
||||
search = search[segEndIdx:]
|
||||
continue
|
||||
}
|
||||
|
||||
// Static nodes fall below here.
|
||||
// Determine longest prefix of the search key on match.
|
||||
commonPrefix := longestPrefix(search, n.prefix)
|
||||
if commonPrefix == len(n.prefix) {
|
||||
// the common prefix is as long as the current node's prefix we're attempting to insert.
|
||||
// keep the search going.
|
||||
search = search[commonPrefix:]
|
||||
continue
|
||||
}
|
||||
|
||||
// Split the node
|
||||
child := &node{
|
||||
typ: ntStatic,
|
||||
prefix: search[:commonPrefix],
|
||||
}
|
||||
parent.replaceChild(search[0], segTail, child)
|
||||
|
||||
// Restore the existing node
|
||||
n.label = n.prefix[commonPrefix]
|
||||
n.prefix = n.prefix[commonPrefix:]
|
||||
child.addChild(n, n.prefix)
|
||||
|
||||
// If the new key is a subset, set the method/handler on this node and finish.
|
||||
search = search[commonPrefix:]
|
||||
if len(search) == 0 {
|
||||
child.setEndpoint(method, handler, pattern)
|
||||
return child
|
||||
}
|
||||
|
||||
// Create a new edge for the node
|
||||
subchild := &node{
|
||||
typ: ntStatic,
|
||||
label: search[0],
|
||||
prefix: search,
|
||||
}
|
||||
hn := child.addChild(subchild, search)
|
||||
hn.setEndpoint(method, handler, pattern)
|
||||
return hn
|
||||
}
|
||||
}
|
||||
|
||||
// addChild appends the new `child` node to the tree using the `pattern` as the trie key.
|
||||
// For a URL router like chi's, we split the static, param, regexp and wildcard segments
|
||||
// into different nodes. In addition, addChild will recursively call itself until every
|
||||
// pattern segment is added to the url pattern tree as individual nodes, depending on type.
|
||||
func (n *node) addChild(child *node, prefix string) *node {
|
||||
search := prefix
|
||||
|
||||
// handler leaf node added to the tree is the child.
|
||||
// this may be overridden later down the flow
|
||||
hn := child
|
||||
|
||||
// Parse next segment
|
||||
segTyp, _, segRexpat, segTail, segStartIdx, segEndIdx := patNextSegment(search)
|
||||
|
||||
// Add child depending on next up segment
|
||||
switch segTyp {
|
||||
|
||||
case ntStatic:
|
||||
// Search prefix is all static (that is, has no params in path)
|
||||
// noop
|
||||
|
||||
default:
|
||||
// Search prefix contains a param, regexp or wildcard
|
||||
|
||||
if segTyp == ntRegexp {
|
||||
rex, err := regexp.Compile(segRexpat)
|
||||
if err != nil {
|
||||
panic(fmt.Sprintf("chi: invalid regexp pattern '%s' in route param", segRexpat))
|
||||
}
|
||||
child.prefix = segRexpat
|
||||
child.rex = rex
|
||||
}
|
||||
|
||||
if segStartIdx == 0 {
|
||||
// Route starts with a param
|
||||
child.typ = segTyp
|
||||
|
||||
if segTyp == ntCatchAll {
|
||||
segStartIdx = -1
|
||||
} else {
|
||||
segStartIdx = segEndIdx
|
||||
}
|
||||
if segStartIdx < 0 {
|
||||
segStartIdx = len(search)
|
||||
}
|
||||
child.tail = segTail // for params, we set the tail
|
||||
|
||||
if segStartIdx != len(search) {
|
||||
// add static edge for the remaining part, split the end.
|
||||
// its not possible to have adjacent param nodes, so its certainly
|
||||
// going to be a static node next.
|
||||
|
||||
search = search[segStartIdx:] // advance search position
|
||||
|
||||
nn := &node{
|
||||
typ: ntStatic,
|
||||
label: search[0],
|
||||
prefix: search,
|
||||
}
|
||||
hn = child.addChild(nn, search)
|
||||
}
|
||||
|
||||
} else if segStartIdx > 0 {
|
||||
// Route has some param
|
||||
|
||||
// starts with a static segment
|
||||
child.typ = ntStatic
|
||||
child.prefix = search[:segStartIdx]
|
||||
child.rex = nil
|
||||
|
||||
// add the param edge node
|
||||
search = search[segStartIdx:]
|
||||
|
||||
nn := &node{
|
||||
typ: segTyp,
|
||||
label: search[0],
|
||||
tail: segTail,
|
||||
}
|
||||
hn = child.addChild(nn, search)
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
n.children[child.typ] = append(n.children[child.typ], child)
|
||||
n.children[child.typ].Sort()
|
||||
return hn
|
||||
}
|
||||
|
||||
func (n *node) replaceChild(label, tail byte, child *node) {
|
||||
for i := 0; i < len(n.children[child.typ]); i++ {
|
||||
if n.children[child.typ][i].label == label && n.children[child.typ][i].tail == tail {
|
||||
n.children[child.typ][i] = child
|
||||
n.children[child.typ][i].label = label
|
||||
n.children[child.typ][i].tail = tail
|
||||
return
|
||||
}
|
||||
}
|
||||
panic("chi: replacing missing child")
|
||||
}
|
||||
|
||||
func (n *node) getEdge(ntyp nodeTyp, label, tail byte, prefix string) *node {
|
||||
nds := n.children[ntyp]
|
||||
for i := 0; i < len(nds); i++ {
|
||||
if nds[i].label == label && nds[i].tail == tail {
|
||||
if ntyp == ntRegexp && nds[i].prefix != prefix {
|
||||
continue
|
||||
}
|
||||
return nds[i]
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (n *node) setEndpoint(method methodTyp, handler http.Handler, pattern string) {
|
||||
// Set the handler for the method type on the node
|
||||
if n.endpoints == nil {
|
||||
n.endpoints = make(endpoints, 0)
|
||||
}
|
||||
|
||||
paramKeys := patParamKeys(pattern)
|
||||
|
||||
if method&mSTUB == mSTUB {
|
||||
n.endpoints.Value(mSTUB).handler = handler
|
||||
}
|
||||
if method&mALL == mALL {
|
||||
h := n.endpoints.Value(mALL)
|
||||
h.handler = handler
|
||||
h.pattern = pattern
|
||||
h.paramKeys = paramKeys
|
||||
for _, m := range methodMap {
|
||||
h := n.endpoints.Value(m)
|
||||
h.handler = handler
|
||||
h.pattern = pattern
|
||||
h.paramKeys = paramKeys
|
||||
}
|
||||
} else {
|
||||
h := n.endpoints.Value(method)
|
||||
h.handler = handler
|
||||
h.pattern = pattern
|
||||
h.paramKeys = paramKeys
|
||||
}
|
||||
}
|
||||
|
||||
func (n *node) FindRoute(rctx *Context, method methodTyp, path string) (*node, endpoints, http.Handler) {
|
||||
// Reset the context routing pattern and params
|
||||
rctx.routePattern = ""
|
||||
rctx.routeParams.Keys = rctx.routeParams.Keys[:0]
|
||||
rctx.routeParams.Values = rctx.routeParams.Values[:0]
|
||||
|
||||
// Find the routing handlers for the path
|
||||
rn := n.findRoute(rctx, method, path)
|
||||
if rn == nil {
|
||||
return nil, nil, nil
|
||||
}
|
||||
|
||||
// Record the routing params in the request lifecycle
|
||||
rctx.URLParams.Keys = append(rctx.URLParams.Keys, rctx.routeParams.Keys...)
|
||||
rctx.URLParams.Values = append(rctx.URLParams.Values, rctx.routeParams.Values...)
|
||||
|
||||
// Record the routing pattern in the request lifecycle
|
||||
if rn.endpoints[method].pattern != "" {
|
||||
rctx.routePattern = rn.endpoints[method].pattern
|
||||
rctx.RoutePatterns = append(rctx.RoutePatterns, rctx.routePattern)
|
||||
}
|
||||
|
||||
return rn, rn.endpoints, rn.endpoints[method].handler
|
||||
}
|
||||
|
||||
// Recursive edge traversal by checking all nodeTyp groups along the way.
|
||||
// It's like searching through a multi-dimensional radix trie.
|
||||
func (n *node) findRoute(rctx *Context, method methodTyp, path string) *node {
|
||||
nn := n
|
||||
search := path
|
||||
|
||||
for t, nds := range nn.children {
|
||||
ntyp := nodeTyp(t)
|
||||
if len(nds) == 0 {
|
||||
continue
|
||||
}
|
||||
|
||||
var xn *node
|
||||
xsearch := search
|
||||
|
||||
var label byte
|
||||
if search != "" {
|
||||
label = search[0]
|
||||
}
|
||||
|
||||
switch ntyp {
|
||||
case ntStatic:
|
||||
xn = nds.findEdge(label)
|
||||
if xn == nil || !strings.HasPrefix(xsearch, xn.prefix) {
|
||||
continue
|
||||
}
|
||||
xsearch = xsearch[len(xn.prefix):]
|
||||
|
||||
case ntParam, ntRegexp:
|
||||
// short-circuit and return no matching route for empty param values
|
||||
if xsearch == "" {
|
||||
continue
|
||||
}
|
||||
|
||||
// serially loop through each node grouped by the tail delimiter
|
||||
for idx := 0; idx < len(nds); idx++ {
|
||||
xn = nds[idx]
|
||||
|
||||
// label for param nodes is the delimiter byte
|
||||
p := strings.IndexByte(xsearch, xn.tail)
|
||||
|
||||
if p < 0 {
|
||||
if xn.tail == '/' {
|
||||
p = len(xsearch)
|
||||
} else {
|
||||
continue
|
||||
}
|
||||
}
|
||||
|
||||
if ntyp == ntRegexp && xn.rex != nil {
|
||||
if xn.rex.Match([]byte(xsearch[:p])) == false {
|
||||
continue
|
||||
}
|
||||
} else if strings.IndexByte(xsearch[:p], '/') != -1 {
|
||||
// avoid a match across path segments
|
||||
continue
|
||||
}
|
||||
|
||||
rctx.routeParams.Values = append(rctx.routeParams.Values, xsearch[:p])
|
||||
xsearch = xsearch[p:]
|
||||
break
|
||||
}
|
||||
|
||||
default:
|
||||
// catch-all nodes
|
||||
rctx.routeParams.Values = append(rctx.routeParams.Values, search)
|
||||
xn = nds[0]
|
||||
xsearch = ""
|
||||
}
|
||||
|
||||
if xn == nil {
|
||||
continue
|
||||
}
|
||||
|
||||
// did we find it yet?
|
||||
if len(xsearch) == 0 {
|
||||
if xn.isLeaf() {
|
||||
h, _ := xn.endpoints[method]
|
||||
if h != nil && h.handler != nil {
|
||||
rctx.routeParams.Keys = append(rctx.routeParams.Keys, h.paramKeys...)
|
||||
return xn
|
||||
}
|
||||
|
||||
// flag that the routing context found a route, but not a corresponding
|
||||
// supported method
|
||||
rctx.methodNotAllowed = true
|
||||
}
|
||||
}
|
||||
|
||||
// recursively find the next node..
|
||||
fin := xn.findRoute(rctx, method, xsearch)
|
||||
if fin != nil {
|
||||
return fin
|
||||
}
|
||||
|
||||
// Did not find final handler, let's remove the param here if it was set
|
||||
if xn.typ > ntStatic {
|
||||
if len(rctx.routeParams.Values) > 0 {
|
||||
rctx.routeParams.Values = rctx.routeParams.Values[:len(rctx.routeParams.Values)-1]
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (n *node) findEdge(ntyp nodeTyp, label byte) *node {
|
||||
nds := n.children[ntyp]
|
||||
num := len(nds)
|
||||
idx := 0
|
||||
|
||||
switch ntyp {
|
||||
case ntStatic, ntParam, ntRegexp:
|
||||
i, j := 0, num-1
|
||||
for i <= j {
|
||||
idx = i + (j-i)/2
|
||||
if label > nds[idx].label {
|
||||
i = idx + 1
|
||||
} else if label < nds[idx].label {
|
||||
j = idx - 1
|
||||
} else {
|
||||
i = num // breaks cond
|
||||
}
|
||||
}
|
||||
if nds[idx].label != label {
|
||||
return nil
|
||||
}
|
||||
return nds[idx]
|
||||
|
||||
default: // catch all
|
||||
return nds[idx]
|
||||
}
|
||||
}
|
||||
|
||||
func (n *node) isEmpty() bool {
|
||||
for _, nds := range n.children {
|
||||
if len(nds) > 0 {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
func (n *node) isLeaf() bool {
|
||||
return n.endpoints != nil
|
||||
}
|
||||
|
||||
func (n *node) findPattern(pattern string) bool {
|
||||
nn := n
|
||||
for _, nds := range nn.children {
|
||||
if len(nds) == 0 {
|
||||
continue
|
||||
}
|
||||
|
||||
n = nn.findEdge(nds[0].typ, pattern[0])
|
||||
if n == nil {
|
||||
continue
|
||||
}
|
||||
|
||||
var idx int
|
||||
var xpattern string
|
||||
|
||||
switch n.typ {
|
||||
case ntStatic:
|
||||
idx = longestPrefix(pattern, n.prefix)
|
||||
if idx < len(n.prefix) {
|
||||
continue
|
||||
}
|
||||
|
||||
case ntParam, ntRegexp:
|
||||
idx = strings.IndexByte(pattern, '}') + 1
|
||||
|
||||
case ntCatchAll:
|
||||
idx = longestPrefix(pattern, "*")
|
||||
|
||||
default:
|
||||
panic("chi: unknown node type")
|
||||
}
|
||||
|
||||
xpattern = pattern[idx:]
|
||||
if len(xpattern) == 0 {
|
||||
return true
|
||||
}
|
||||
|
||||
return n.findPattern(xpattern)
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func (n *node) routes() []Route {
|
||||
rts := []Route{}
|
||||
|
||||
n.walk(func(eps endpoints, subroutes Routes) bool {
|
||||
if eps[mSTUB] != nil && eps[mSTUB].handler != nil && subroutes == nil {
|
||||
return false
|
||||
}
|
||||
|
||||
// Group methodHandlers by unique patterns
|
||||
pats := make(map[string]endpoints, 0)
|
||||
|
||||
for mt, h := range eps {
|
||||
if h.pattern == "" {
|
||||
continue
|
||||
}
|
||||
p, ok := pats[h.pattern]
|
||||
if !ok {
|
||||
p = endpoints{}
|
||||
pats[h.pattern] = p
|
||||
}
|
||||
p[mt] = h
|
||||
}
|
||||
|
||||
for p, mh := range pats {
|
||||
hs := make(map[string]http.Handler, 0)
|
||||
if mh[mALL] != nil && mh[mALL].handler != nil {
|
||||
hs["*"] = mh[mALL].handler
|
||||
}
|
||||
|
||||
for mt, h := range mh {
|
||||
if h.handler == nil {
|
||||
continue
|
||||
}
|
||||
m := methodTypString(mt)
|
||||
if m == "" {
|
||||
continue
|
||||
}
|
||||
hs[m] = h.handler
|
||||
}
|
||||
|
||||
rt := Route{p, hs, subroutes}
|
||||
rts = append(rts, rt)
|
||||
}
|
||||
|
||||
return false
|
||||
})
|
||||
|
||||
return rts
|
||||
}
|
||||
|
||||
func (n *node) walk(fn func(eps endpoints, subroutes Routes) bool) bool {
|
||||
// Visit the leaf values if any
|
||||
if (n.endpoints != nil || n.subroutes != nil) && fn(n.endpoints, n.subroutes) {
|
||||
return true
|
||||
}
|
||||
|
||||
// Recurse on the children
|
||||
for _, ns := range n.children {
|
||||
for _, cn := range ns {
|
||||
if cn.walk(fn) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// patNextSegment returns the next segment details from a pattern:
|
||||
// node type, param key, regexp string, param tail byte, param starting index, param ending index
|
||||
func patNextSegment(pattern string) (nodeTyp, string, string, byte, int, int) {
|
||||
ps := strings.Index(pattern, "{")
|
||||
ws := strings.Index(pattern, "*")
|
||||
|
||||
if ps < 0 && ws < 0 {
|
||||
return ntStatic, "", "", 0, 0, len(pattern) // we return the entire thing
|
||||
}
|
||||
|
||||
// Sanity check
|
||||
if ps >= 0 && ws >= 0 && ws < ps {
|
||||
panic("chi: wildcard '*' must be the last pattern in a route, otherwise use a '{param}'")
|
||||
}
|
||||
|
||||
var tail byte = '/' // Default endpoint tail to / byte
|
||||
|
||||
if ps >= 0 {
|
||||
// Param/Regexp pattern is next
|
||||
nt := ntParam
|
||||
|
||||
// Read to closing } taking into account opens and closes in curl count (cc)
|
||||
cc := 0
|
||||
pe := ps
|
||||
for i, c := range pattern[ps:] {
|
||||
if c == '{' {
|
||||
cc++
|
||||
} else if c == '}' {
|
||||
cc--
|
||||
if cc == 0 {
|
||||
pe = ps + i
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
if pe == ps {
|
||||
panic("chi: route param closing delimiter '}' is missing")
|
||||
}
|
||||
|
||||
key := pattern[ps+1 : pe]
|
||||
pe++ // set end to next position
|
||||
|
||||
if pe < len(pattern) {
|
||||
tail = pattern[pe]
|
||||
}
|
||||
|
||||
var rexpat string
|
||||
if idx := strings.Index(key, ":"); idx >= 0 {
|
||||
nt = ntRegexp
|
||||
rexpat = key[idx+1:]
|
||||
key = key[:idx]
|
||||
}
|
||||
|
||||
if len(rexpat) > 0 {
|
||||
if rexpat[0] != '^' {
|
||||
rexpat = "^" + rexpat
|
||||
}
|
||||
if rexpat[len(rexpat)-1] != '$' {
|
||||
rexpat = rexpat + "$"
|
||||
}
|
||||
}
|
||||
|
||||
return nt, key, rexpat, tail, ps, pe
|
||||
}
|
||||
|
||||
// Wildcard pattern as finale
|
||||
if ws < len(pattern)-1 {
|
||||
panic("chi: wildcard '*' must be the last value in a route. trim trailing text or use a '{param}' instead")
|
||||
}
|
||||
return ntCatchAll, "*", "", 0, ws, len(pattern)
|
||||
}
|
||||
|
||||
func patParamKeys(pattern string) []string {
|
||||
pat := pattern
|
||||
paramKeys := []string{}
|
||||
for {
|
||||
ptyp, paramKey, _, _, _, e := patNextSegment(pat)
|
||||
if ptyp == ntStatic {
|
||||
return paramKeys
|
||||
}
|
||||
for i := 0; i < len(paramKeys); i++ {
|
||||
if paramKeys[i] == paramKey {
|
||||
panic(fmt.Sprintf("chi: routing pattern '%s' contains duplicate param key, '%s'", pattern, paramKey))
|
||||
}
|
||||
}
|
||||
paramKeys = append(paramKeys, paramKey)
|
||||
pat = pat[e:]
|
||||
}
|
||||
}
|
||||
|
||||
// longestPrefix finds the length of the shared prefix
|
||||
// of two strings
|
||||
func longestPrefix(k1, k2 string) int {
|
||||
max := len(k1)
|
||||
if l := len(k2); l < max {
|
||||
max = l
|
||||
}
|
||||
var i int
|
||||
for i = 0; i < max; i++ {
|
||||
if k1[i] != k2[i] {
|
||||
break
|
||||
}
|
||||
}
|
||||
return i
|
||||
}
|
||||
|
||||
func methodTypString(method methodTyp) string {
|
||||
for s, t := range methodMap {
|
||||
if method == t {
|
||||
return s
|
||||
}
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
type nodes []*node
|
||||
|
||||
// Sort the list of nodes by label
|
||||
func (ns nodes) Sort() { sort.Sort(ns); ns.tailSort() }
|
||||
func (ns nodes) Len() int { return len(ns) }
|
||||
func (ns nodes) Swap(i, j int) { ns[i], ns[j] = ns[j], ns[i] }
|
||||
func (ns nodes) Less(i, j int) bool { return ns[i].label < ns[j].label }
|
||||
|
||||
// tailSort pushes nodes with '/' as the tail to the end of the list for param nodes.
|
||||
// The list order determines the traversal order.
|
||||
func (ns nodes) tailSort() {
|
||||
for i := len(ns) - 1; i >= 0; i-- {
|
||||
if ns[i].typ > ntStatic && ns[i].tail == '/' {
|
||||
ns.Swap(i, len(ns)-1)
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (ns nodes) findEdge(label byte) *node {
|
||||
num := len(ns)
|
||||
idx := 0
|
||||
i, j := 0, num-1
|
||||
for i <= j {
|
||||
idx = i + (j-i)/2
|
||||
if label > ns[idx].label {
|
||||
i = idx + 1
|
||||
} else if label < ns[idx].label {
|
||||
j = idx - 1
|
||||
} else {
|
||||
i = num // breaks cond
|
||||
}
|
||||
}
|
||||
if ns[idx].label != label {
|
||||
return nil
|
||||
}
|
||||
return ns[idx]
|
||||
}
|
||||
|
||||
// Route describes the details of a routing handler.
|
||||
type Route struct {
|
||||
Pattern string
|
||||
Handlers map[string]http.Handler
|
||||
SubRoutes Routes
|
||||
}
|
||||
|
||||
// WalkFunc is the type of the function called for each method and route visited by Walk.
|
||||
type WalkFunc func(method string, route string, handler http.Handler, middlewares ...func(http.Handler) http.Handler) error
|
||||
|
||||
// Walk walks any router tree that implements Routes interface.
|
||||
func Walk(r Routes, walkFn WalkFunc) error {
|
||||
return walk(r, walkFn, "")
|
||||
}
|
||||
|
||||
func walk(r Routes, walkFn WalkFunc, parentRoute string, parentMw ...func(http.Handler) http.Handler) error {
|
||||
for _, route := range r.Routes() {
|
||||
mws := make([]func(http.Handler) http.Handler, len(parentMw))
|
||||
copy(mws, parentMw)
|
||||
mws = append(mws, r.Middlewares()...)
|
||||
|
||||
if route.SubRoutes != nil {
|
||||
if err := walk(route.SubRoutes, walkFn, parentRoute+route.Pattern, mws...); err != nil {
|
||||
return err
|
||||
}
|
||||
continue
|
||||
}
|
||||
|
||||
for method, handler := range route.Handlers {
|
||||
if method == "*" {
|
||||
// Ignore a "catchAll" method, since we pass down all the specific methods for each route.
|
||||
continue
|
||||
}
|
||||
|
||||
fullRoute := parentRoute + route.Pattern
|
||||
|
||||
if chain, ok := handler.(*ChainHandler); ok {
|
||||
if err := walkFn(method, fullRoute, chain.Endpoint, append(mws, chain.Middlewares...)...); err != nil {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
if err := walkFn(method, fullRoute, handler, mws...); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
|
@ -3,6 +3,7 @@
|
|||
github.com/alecthomas/kong
|
||||
# github.com/go-chi/chi v4.0.2+incompatible
|
||||
## explicit
|
||||
github.com/go-chi/chi
|
||||
# github.com/go-yaml/yaml v2.1.0+incompatible
|
||||
## explicit
|
||||
# github.com/kr/pretty v0.1.0
|
||||
|
|
|
|||
Loading…
Reference in New Issue