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9a94fb2280
422 Unprocessable Entity means a well-formed request with invalid semantics, which does not fit a cancelled request. The request context is also cancelled on server shutdown, where 503 Service Unavailable is the conventional response. Signed-off-by: Solomon Jacobs <solomonjacobs@protonmail.com>
78 lines
2.4 KiB
Go
78 lines
2.4 KiB
Go
// Copyright The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package httpserver
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import (
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"fmt"
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"net/http"
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_ "net/http/pprof" // Comment this line to disable pprof endpoint.
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"path"
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"strings"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/prometheus/common/route"
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)
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// Register registers handlers to serve files for automations.
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func Register(r *route.Router, reloadCh chan<- chan error) {
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r.Get("/metrics", promhttp.Handler().ServeHTTP)
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r.Post("/-/reload", func(w http.ResponseWriter, req *http.Request) {
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errc := make(chan error, 1)
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select {
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case reloadCh <- errc:
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case <-req.Context().Done():
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http.Error(w, req.Context().Err().Error(), http.StatusServiceUnavailable)
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return
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}
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select {
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case err := <-errc:
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if err != nil {
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http.Error(w, fmt.Sprintf("failed to reload config: %s", err), http.StatusInternalServerError)
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}
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case <-req.Context().Done():
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http.Error(w, req.Context().Err().Error(), http.StatusServiceUnavailable)
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}
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})
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r.Get("/-/healthy", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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fmt.Fprintf(w, "OK")
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})
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r.Head("/-/healthy", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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})
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r.Get("/-/ready", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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fmt.Fprintf(w, "OK")
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})
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r.Head("/-/ready", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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})
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debugHandlerFunc := func(w http.ResponseWriter, req *http.Request) {
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subpath := route.Param(req.Context(), "subpath")
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req.URL.Path = path.Join("/debug", subpath)
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// path.Join removes trailing slashes, but some pprof handlers expect them.
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if strings.HasSuffix(subpath, "/") && !strings.HasSuffix(req.URL.Path, "/") {
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req.URL.Path += "/"
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}
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http.DefaultServeMux.ServeHTTP(w, req)
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}
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r.Get("/debug/*subpath", debugHandlerFunc)
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r.Post("/debug/*subpath", debugHandlerFunc)
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}
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