mirror of
https://github.com/Luzifer/nginx-sso.git
synced 2024-12-20 21:01:17 +00:00
61 lines
2 KiB
Go
61 lines
2 KiB
Go
// Copyright 2018, OpenCensus Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package ochttp
|
|
|
|
import (
|
|
"context"
|
|
"net/http"
|
|
|
|
"go.opencensus.io/tag"
|
|
)
|
|
|
|
// SetRoute sets the http_server_route tag to the given value.
|
|
// It's useful when an HTTP framework does not support the http.Handler interface
|
|
// and using WithRouteTag is not an option, but provides a way to hook into the request flow.
|
|
func SetRoute(ctx context.Context, route string) {
|
|
if a, ok := ctx.Value(addedTagsKey{}).(*addedTags); ok {
|
|
a.t = append(a.t, tag.Upsert(KeyServerRoute, route))
|
|
}
|
|
}
|
|
|
|
// WithRouteTag returns an http.Handler that records stats with the
|
|
// http_server_route tag set to the given value.
|
|
func WithRouteTag(handler http.Handler, route string) http.Handler {
|
|
return taggedHandlerFunc(func(w http.ResponseWriter, r *http.Request) []tag.Mutator {
|
|
addRoute := []tag.Mutator{tag.Upsert(KeyServerRoute, route)}
|
|
ctx, _ := tag.New(r.Context(), addRoute...)
|
|
r = r.WithContext(ctx)
|
|
handler.ServeHTTP(w, r)
|
|
return addRoute
|
|
})
|
|
}
|
|
|
|
// taggedHandlerFunc is a http.Handler that returns tags describing the
|
|
// processing of the request. These tags will be recorded along with the
|
|
// measures in this package at the end of the request.
|
|
type taggedHandlerFunc func(w http.ResponseWriter, r *http.Request) []tag.Mutator
|
|
|
|
func (h taggedHandlerFunc) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
tags := h(w, r)
|
|
if a, ok := r.Context().Value(addedTagsKey{}).(*addedTags); ok {
|
|
a.t = append(a.t, tags...)
|
|
}
|
|
}
|
|
|
|
type addedTagsKey struct{}
|
|
|
|
type addedTags struct {
|
|
t []tag.Mutator
|
|
}
|