/
collector.go
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/
collector.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 collector
import (
"context"
"fmt"
"os"
"github.com/open-telemetry/opentelemetry-collector-contrib/confmap/provider/s3provider"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/confmap"
"go.opentelemetry.io/collector/confmap/converter/expandconverter"
"go.opentelemetry.io/collector/confmap/provider/envprovider"
"go.opentelemetry.io/collector/confmap/provider/fileprovider"
"go.opentelemetry.io/collector/confmap/provider/httpprovider"
"go.opentelemetry.io/collector/confmap/provider/yamlprovider"
"go.opentelemetry.io/collector/otelcol"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/open-telemetry/opentelemetry-lambda/collector/internal/confmap/converter/decoupleafterbatchconverter"
"github.com/open-telemetry/opentelemetry-lambda/collector/internal/confmap/converter/disablequeuedretryconverter"
)
// Collector runs a single otelcol as a go routine within the
// same process as the executor.
type Collector struct {
factories otelcol.Factories
configProvider otelcol.ConfigProvider
svc *otelcol.Collector
appDone chan struct{}
stopped bool
logger *zap.Logger
version string
}
func getConfig(logger *zap.Logger) string {
val, ex := os.LookupEnv("OPENTELEMETRY_COLLECTOR_CONFIG_FILE")
if !ex {
return "/opt/collector-config/config.yaml"
}
logger.Info("Using config URI from environment", zap.String("uri", val))
return val
}
func NewCollector(logger *zap.Logger, factories otelcol.Factories, version string) *Collector {
l := logger.Named("NewCollector")
providerSettings := confmap.ProviderSettings{Logger: l}
providers := []confmap.Provider{fileprovider.NewWithSettings(providerSettings), envprovider.NewWithSettings(providerSettings), yamlprovider.NewWithSettings(providerSettings), httpprovider.NewWithSettings(providerSettings), s3provider.New()}
mapProvider := make(map[string]confmap.Provider, len(providers))
for _, provider := range providers {
mapProvider[provider.Scheme()] = provider
}
converterSettings := confmap.ConverterSettings{}
cfgSet := otelcol.ConfigProviderSettings{
ResolverSettings: confmap.ResolverSettings{
URIs: []string{getConfig(l)},
Providers: mapProvider,
Converters: []confmap.Converter{expandconverter.New(converterSettings), disablequeuedretryconverter.New(), decoupleafterbatchconverter.New()},
},
}
cfgProvider, err := otelcol.NewConfigProvider(cfgSet)
if err != nil {
l.Fatal("error creating config provider", zap.Error(err))
}
col := &Collector{
factories: factories,
configProvider: cfgProvider,
logger: logger,
version: version,
}
return col
}
func (c *Collector) Start(ctx context.Context) error {
params := otelcol.CollectorSettings{
BuildInfo: component.BuildInfo{
Command: "otelcol-lambda",
Description: "Lambda Collector",
Version: c.version,
},
ConfigProvider: c.configProvider,
Factories: func() (otelcol.Factories, error) {
return c.factories, nil
},
LoggingOptions: []zap.Option{zap.WrapCore(func(_ zapcore.Core) zapcore.Core {
return c.logger.Core()
})},
}
var err error
c.svc, err = otelcol.NewCollector(params)
if err != nil {
return err
}
c.appDone = make(chan struct{})
go func() {
defer close(c.appDone)
appErr := c.svc.Run(ctx)
if appErr != nil {
err = appErr
}
}()
for {
state := c.svc.GetState()
// While waiting for collector start, an error was found. Most likely
// an invalid custom collector configuration file.
if err != nil {
return err
}
switch state {
case otelcol.StateStarting:
// NoOp
case otelcol.StateRunning:
return nil
default:
err = fmt.Errorf("unable to start, otelcol state is %d", state)
}
}
}
func (c *Collector) Stop() error {
if !c.stopped {
c.stopped = true
c.svc.Shutdown()
}
<-c.appDone
return nil
}