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// Copyright 2014 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 (
"net/http"
"sync"
"time"
"github.com/julienschmidt/httprouter"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
"github.com/prometheus/pushgateway/storage"
)
// Delete returns a handler that accepts delete requests.
//
// The returned handler is already instrumented for Prometheus.
func Delete(ms storage.MetricStore) func(http.ResponseWriter, *http.Request, httprouter.Params) {
var ps httprouter.Params
var mtx sync.Mutex // Protects ps.
instrumentedHandler := promhttp.InstrumentHandlerCounter(
httpCnt.MustCurryWith(prometheus.Labels{"handler": "delete"}),
http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
job := ps.ByName("job")
labelsString := ps.ByName("labels")
mtx.Unlock()
labels, err := splitLabels(labelsString)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
log.Debugf("Failed to parse URL: %v, %v", labelsString, err.Error())
return
}
if job == "" {
http.Error(w, "job name is required", http.StatusBadRequest)
log.Debug("job name is required")
return
}
labels["job"] = job
ms.SubmitWriteRequest(storage.WriteRequest{
Labels: labels,
Timestamp: time.Now(),
})
w.WriteHeader(http.StatusAccepted)
}),
)
return func(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
mtx.Lock()
ps = params
instrumentedHandler.ServeHTTP(w, r)
}
}
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