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exporter.go
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/
exporter.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package fluentforwardexporter // import "github.com/r0mdau/fluentforwardexporter"
import (
"context"
"fmt"
"sync"
fclient "github.com/IBM/fluent-forward-go/fluent/client"
"github.com/IBM/fluent-forward-go/fluent/protocol"
fproto "github.com/IBM/fluent-forward-go/fluent/protocol"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/pdata/plog"
)
type fluentforwardExporter struct {
config *Config
settings component.TelemetrySettings
client *fclient.Client
wg sync.WaitGroup
}
func newExporter(config *Config, settings component.TelemetrySettings) *fluentforwardExporter {
settings.Logger.Info("Creating the Fluent Forward exporter")
return &fluentforwardExporter{
config: config,
settings: settings,
}
}
func (f *fluentforwardExporter) start(ctx context.Context, host component.Host) error {
connOptions := fclient.ConnectionOptions{
RequireAck: f.config.RequireAck,
}
tlsConfig, err := f.config.ClientConfig.LoadTLSConfig(ctx)
if err != nil {
return err
}
connFactory := &fclient.ConnFactory{
Address: f.config.Endpoint,
Timeout: f.config.ConnectionTimeout,
TLSConfig: tlsConfig,
}
connOptions.Factory = connFactory
if f.config.SharedKey != "" {
connOptions.AuthInfo = fclient.AuthInfo{
SharedKey: []byte(f.config.SharedKey),
}
}
client := fclient.New(connOptions)
f.client = client
f.connectForward()
return nil
}
func (f *fluentforwardExporter) stop(context.Context) (err error) {
f.wg.Wait()
return f.client.Disconnect()
}
// connectForward connects to the Fluent Forward endpoint and keep running otel even if the connection is failing
func (f *fluentforwardExporter) connectForward() {
if err := f.client.Connect(); err != nil {
f.settings.Logger.Error(fmt.Sprintf("Failed to connect to the endpoint %s", f.config.Endpoint))
return
}
f.settings.Logger.Info(fmt.Sprintf("Successfull connection to the endpoint %s", f.config.Endpoint))
if f.config.SharedKey != "" {
if err := f.client.Handshake(); err != nil {
f.settings.Logger.Error(fmt.Sprintf("Failed shared key handshake with the endpoint %s", f.config.Endpoint))
return
}
f.settings.Logger.Info("Successfull shared key handshake with the endpoint")
}
}
func (f *fluentforwardExporter) pushLogData(ctx context.Context, ld plog.Logs) error {
// move for loops into a translator
entries := []fproto.EntryExt{}
rls := ld.ResourceLogs()
for i := 0; i < rls.Len(); i++ {
ills := rls.At(i).ScopeLogs()
for j := 0; j < ills.Len(); j++ {
logs := ills.At(j).LogRecords()
for k := 0; k < logs.Len(); k++ {
log := logs.At(k)
entry := fproto.EntryExt{
Timestamp: fproto.EventTimeNow(),
Record: f.convertLogToMap(log),
}
entries = append(entries, entry)
}
}
}
if f.config.CompressGzip {
return f.sendCompressed(entries)
}
return f.sendForward(entries)
}
func (f *fluentforwardExporter) convertLogToMap(lr plog.LogRecord) map[string]interface{} {
// move function into a translator
m := make(map[string]interface{})
m["severity"] = lr.SeverityText()
m["message"] = lr.Body().AsString()
for key, val := range f.config.DefaultLabelsEnabled {
if val {
attribute, found := lr.Attributes().Get(key)
if found {
m[key] = attribute.AsString()
}
}
}
return m
}
type sendFunc func(string, protocol.EntryList) error
func (f *fluentforwardExporter) send(sendMethod sendFunc, entries []fproto.EntryExt) error {
err := sendMethod(f.config.Tag, entries)
// sometimes the connection is lost, we try to reconnect and send the data again
if err != nil {
if errr := f.client.Disconnect(); errr != nil {
return errr
}
f.settings.Logger.Warn(fmt.Sprintf("Failed to send data to the endpoint %s, trying to reconnect", f.config.Endpoint))
f.connectForward()
err = sendMethod(f.config.Tag, entries)
if err != nil {
return err
}
}
return nil
}
func (f *fluentforwardExporter) sendCompressed(entries []fproto.EntryExt) error {
return f.send(f.client.SendCompressed, entries)
}
func (f *fluentforwardExporter) sendForward(entries []fproto.EntryExt) error {
return f.send(f.client.SendForward, entries)
}