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// Copyright 2017 The Prometheus 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 handler
import (
"io"
"net/http"
"github.com/prometheus/common/server"
"github.com/prometheus/pushgateway/storage"
)
// Healthy is used to report the health of the Pushgateway. It currently only
// uses the Healthy method of the MetricScore to detect healthy state.
//
// The returned handler is already instrumented for Prometheus.
func Healthy(ms storage.MetricStore) http.Handler {
return InstrumentWithCounter(
"healthy",
http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
err := ms.Healthy()
if err == nil {
io.WriteString(w, "OK")
} else {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}),
)
}
// Ready is used to report if the Pushgateway is ready to process requests. It
// currently only uses the Ready method of the MetricScore to detect ready
// state.
//
// The returned handler is already instrumented for Prometheus.
func Ready(ms storage.MetricStore) http.Handler {
return InstrumentWithCounter(
"ready",
http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
err := ms.Ready()
if err == nil {
io.WriteString(w, "OK")
} else {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}),
)
}
// Static serves the static files from the provided http.FileSystem.
//
// The returned handler is already instrumented for Prometheus.
func Static(root http.FileSystem, prefix string) http.Handler {
if prefix == "/" {
prefix = ""
}
handler := server.StaticFileServer(root)
return InstrumentWithCounter(
"static",
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = r.URL.Path[len(prefix):]
handler.ServeHTTP(w, r)
}),
)
}
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