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/*
*
* Copyright 2019 Intel Corporation.
* 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 api
import (
"encoding/json"
"errors"
"io"
"io/ioutil"
"net/http"
logger "prom-kafka-writer/pkg/config"
kw "prom-kafka-writer/pkg/kafkawriter"
"github.com/golang/protobuf/proto"
"github.com/golang/snappy"
"github.com/gorilla/mux"
"github.com/prometheus/prometheus/prompb"
)
type kwResponse struct {
KWid string `json:"kwid,omitempty"`
KWCRespMap kw.KWRespMap `json:"kafkaWriterConfigs,omitempty"`
}
var log = logger.GetLoggerInstance()
// CreateKWHandler - Creates and starts a Prometheus to Kafka writer
func CreateKWHandler(w http.ResponseWriter, r *http.Request) {
log.Infow("Received request for Creating Kafka Writer")
kwConfig := kw.NewKWConfig()
dec := json.NewDecoder(r.Body)
dec.DisallowUnknownFields()
err := dec.Decode(kwConfig)
switch {
case err == io.EOF:
http.Error(w, "Body empty", http.StatusBadRequest)
return
case err != nil:
http.Error(w, err.Error(), http.StatusUnprocessableEntity)
return
}
kwid, err := kw.AddKWC(kwConfig)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
//Send response back
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusCreated)
kwResp := kwResponse{
KWid: kwid,
}
err = json.NewEncoder(w).Encode(kwResp)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
// ListKWHandler - Lists the KafkaWriters and its config
func ListKWHandler(w http.ResponseWriter, r *http.Request) {
log.Infow("Received request for List Kafka Writers", "url", r.URL)
res := kw.ListKWC()
//Send response back
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
kwResp := kwResponse{
KWCRespMap: res,
}
err := json.NewEncoder(w).Encode(kwResp)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
// DeleteKWHandler - Deletes a given Prometheus to Kafka writer
func DeleteKWHandler(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
log.Infow("Received request for Deleting Kafka Writer", "KWID", params["kwid"])
kw.DeleteKWC(params["kwid"])
//Send response back
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
}
// ReceiveKWHandler - Publish metrics from Prometheus to Kafka
func ReceiveKWHandler(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
kwid := params["kwid"]
if _, ok := kw.KWMap[kwid]; !ok {
notRegisteredErr := errors.New("kafka writer not registered").Error()
log.Error(notRegisteredErr)
http.Error(w, notRegisteredErr, http.StatusNotFound)
return
}
log.Infow("Produce message on Kafka Writer", "kwid", kwid)
compressed, err := ioutil.ReadAll(r.Body)
defer r.Body.Close()
if err != nil {
log.Error("error", err.Error())
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
metricBuf, err := snappy.Decode(nil, compressed)
if err != nil {
log.Error("error", err.Error())
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
var metrics prompb.WriteRequest
if err := proto.Unmarshal(metricBuf, &metrics); err != nil {
log.Error("error", err.Error())
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = kw.PublishTimeSeries(kwid, &metrics)
if err != nil {
log.Error("error", err.Error())
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
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