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receiver.go
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receiver.go
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// Copyright The OpenTelemetry 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 prometheusremotewritereceiver implements Prometheus Remote Write API for OTLP collector.
package prometheusremotewritereceiver
import (
"bytes"
"context"
"errors"
"io"
"net"
"net/http"
"sync"
"github.com/golang/snappy"
"github.com/valyala/bytebufferpool"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config/confighttp"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/receiver"
"go.opentelemetry.io/collector/receiver/receiverhelper"
"go.uber.org/zap"
"github.com/go-faster/oteldb/internal/otelreceiver/prometheusremotewrite"
"github.com/go-faster/oteldb/internal/prompb"
)
const receiverFormat = "protobuf"
// Receiver is a Prometheus remote write receiver.
type Receiver struct {
params receiver.CreateSettings
host component.Host
nextConsumer consumer.Metrics
mu sync.Mutex
startOnce sync.Once
stopOnce sync.Once
shutdownWG sync.WaitGroup
server *http.Server
config *Config
timeThreshold *int64
logger *zap.Logger
obsrecv *receiverhelper.ObsReport
}
// NewReceiver creates new [Start].
func NewReceiver(params receiver.CreateSettings, config *Config, mconsumer consumer.Metrics) (*Receiver, error) {
obsrecv, err := receiverhelper.NewObsReport(receiverhelper.ObsReportSettings{
ReceiverID: params.ID,
Transport: "http",
ReceiverCreateSettings: params,
})
zr := &Receiver{
params: params,
nextConsumer: mconsumer,
config: config,
logger: params.Logger,
obsrecv: obsrecv,
timeThreshold: &config.TimeThreshold,
}
return zr, err
}
var _ component.Component = (*Receiver)(nil)
// Start implements [component.Component].
func (rec *Receiver) Start(ctx context.Context, host component.Host) (err error) {
if host == nil {
return errors.New("nil host")
}
rec.mu.Lock()
defer rec.mu.Unlock()
rec.startOnce.Do(func() {
rec.host = host
rec.server, err = rec.config.ServerConfig.ToServer(ctx,
host,
rec.params.TelemetrySettings,
rec,
confighttp.WithDecoder("snappy", snappyDecoder),
)
var listener net.Listener
listener, err = rec.config.ServerConfig.ToListener(ctx)
if err != nil {
return
}
rec.shutdownWG.Add(1)
go func() {
defer rec.shutdownWG.Done()
if errHTTP := rec.server.Serve(listener); !errors.Is(errHTTP, http.ErrServerClosed) {
rec.params.TelemetrySettings.ReportStatus(component.NewFatalErrorEvent(errHTTP))
}
}()
})
return err
}
func snappyDecoder(body io.ReadCloser) (io.ReadCloser, error) {
compressed := bytebufferpool.Get()
defer bytebufferpool.Put(compressed)
if _, err := io.Copy(compressed, body); err != nil {
return nil, err
}
decompressed, err := snappy.Decode(nil, compressed.Bytes())
if err != nil {
return nil, err
}
return &closerReader{
data: decompressed,
Reader: *bytes.NewReader(decompressed),
}, nil
}
func decodeRequest(r io.Reader, bb *bytebufferpool.ByteBuffer, rw *prompb.WriteRequest) error {
switch r := r.(type) {
case *closerReader:
// Do not make an unnecessary copy of data.
bb.Set(r.data)
default:
if _, err := bb.ReadFrom(r); err != nil {
return err
}
}
return rw.Unmarshal(bb.B)
}
func (rec *Receiver) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := rec.obsrecv.StartMetricsOp(r.Context())
bb := bytebufferpool.Get()
defer bytebufferpool.Put(bb)
wr := getWriteRequest()
defer putWriteRequest(wr)
if err := decodeRequest(r.Body, bb, wr); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
pms, err := prometheusremotewrite.FromTimeSeries(wr.Timeseries, prometheusremotewrite.Settings{
TimeThreshold: *rec.timeThreshold,
Logger: *rec.logger,
})
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
metricCount := pms.ResourceMetrics().Len()
dataPointCount := pms.DataPointCount()
if metricCount != 0 {
err = rec.nextConsumer.ConsumeMetrics(ctx, pms)
}
rec.obsrecv.EndMetricsOp(ctx, receiverFormat, dataPointCount, err)
w.WriteHeader(http.StatusAccepted)
}
// Shutdown implements [component.Component].
func (rec *Receiver) Shutdown(context.Context) (err error) {
rec.stopOnce.Do(func() {
err = rec.server.Close()
rec.shutdownWG.Wait()
})
return err
}