/
pipelines_builder.go
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/
pipelines_builder.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 builder
import (
"context"
"fmt"
"go.uber.org/zap"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/consumer/fanoutconsumer"
)
// builtPipeline is a pipeline that is built based on a config.
// It can have a trace and/or a metrics consumer (the consumer is either the first
// processor in the pipeline or the exporter if pipeline has no processors).
type builtPipeline struct {
logger *zap.Logger
firstTC consumer.Traces
firstMC consumer.Metrics
firstLC consumer.Logs
// MutatesConsumedData is set to true if any processors in the pipeline
// can mutate the TraceData or MetricsData input argument.
MutatesConsumedData bool
processors []component.Processor
}
// BuiltPipelines is a map of build pipelines created from pipeline configs.
type BuiltPipelines map[*config.Pipeline]*builtPipeline
func (bps BuiltPipelines) StartProcessors(ctx context.Context, host component.Host) error {
for _, bp := range bps {
bp.logger.Info("Pipeline is starting...")
hostWrapper := newHostWrapper(host, bp.logger)
// Start in reverse order, starting from the back of processors pipeline.
// This is important so that processors that are earlier in the pipeline and
// reference processors that are later in the pipeline do not start sending
// data to later pipelines which are not yet started.
for i := len(bp.processors) - 1; i >= 0; i-- {
if err := bp.processors[i].Start(ctx, hostWrapper); err != nil {
return err
}
}
bp.logger.Info("Pipeline is started.")
}
return nil
}
func (bps BuiltPipelines) ShutdownProcessors(ctx context.Context) error {
var errs []error
for _, bp := range bps {
bp.logger.Info("Pipeline is shutting down...")
for _, p := range bp.processors {
if err := p.Shutdown(ctx); err != nil {
errs = append(errs, err)
}
}
bp.logger.Info("Pipeline is shutdown.")
}
return consumererror.Combine(errs)
}
// pipelinesBuilder builds Pipelines from config.
type pipelinesBuilder struct {
logger *zap.Logger
appInfo component.ApplicationStartInfo
config *config.Config
exporters Exporters
factories map[config.Type]component.ProcessorFactory
}
// BuildPipelines builds pipeline processors from config. Requires exporters to be already
// built via BuildExporters.
func BuildPipelines(
logger *zap.Logger,
appInfo component.ApplicationStartInfo,
config *config.Config,
exporters Exporters,
factories map[config.Type]component.ProcessorFactory,
) (BuiltPipelines, error) {
pb := &pipelinesBuilder{logger, appInfo, config, exporters, factories}
pipelineProcessors := make(BuiltPipelines)
for _, pipeline := range pb.config.Service.Pipelines {
firstProcessor, err := pb.buildPipeline(context.Background(), pipeline)
if err != nil {
return nil, err
}
pipelineProcessors[pipeline] = firstProcessor
}
return pipelineProcessors, nil
}
// Builds a pipeline of processors. Returns the first processor in the pipeline.
// The last processor in the pipeline will be plugged to fan out the data into exporters
// that are configured for this pipeline.
func (pb *pipelinesBuilder) buildPipeline(ctx context.Context, pipelineCfg *config.Pipeline) (*builtPipeline, error) {
// BuildProcessors the pipeline backwards.
// First create a consumer junction point that fans out the data to all exporters.
var tc consumer.Traces
var mc consumer.Metrics
var lc consumer.Logs
switch pipelineCfg.InputType {
case config.TracesDataType:
tc = pb.buildFanoutExportersTraceConsumer(pipelineCfg.Exporters)
case config.MetricsDataType:
mc = pb.buildFanoutExportersMetricsConsumer(pipelineCfg.Exporters)
case config.LogsDataType:
lc = pb.buildFanoutExportersLogConsumer(pipelineCfg.Exporters)
}
mutatesConsumedData := false
processors := make([]component.Processor, len(pipelineCfg.Processors))
// Now build the processors backwards, starting from the last one.
// The last processor points to consumer which fans out to exporters, then
// the processor itself becomes a consumer for the one that precedes it in
// in the pipeline and so on.
for i := len(pipelineCfg.Processors) - 1; i >= 0; i-- {
procName := pipelineCfg.Processors[i]
procCfg := pb.config.Processors[procName]
factory := pb.factories[procCfg.Type()]
// This processor must point to the next consumer and then
// it becomes the next for the previous one (previous in the pipeline,
// which we will build in the next loop iteration).
var err error
componentLogger := pb.logger.With(zap.String(zapKindKey, zapKindProcessor), zap.String(zapNameKey, procCfg.Name()))
creationParams := component.ProcessorCreateParams{
Logger: componentLogger,
ApplicationStartInfo: pb.appInfo,
}
switch pipelineCfg.InputType {
case config.TracesDataType:
var proc component.TracesProcessor
proc, err = factory.CreateTracesProcessor(ctx, creationParams, procCfg, tc)
if proc != nil {
mutatesConsumedData = mutatesConsumedData || proc.GetCapabilities().MutatesConsumedData
}
processors[i] = proc
tc = proc
case config.MetricsDataType:
var proc component.MetricsProcessor
proc, err = factory.CreateMetricsProcessor(ctx, creationParams, procCfg, mc)
if proc != nil {
mutatesConsumedData = mutatesConsumedData || proc.GetCapabilities().MutatesConsumedData
}
processors[i] = proc
mc = proc
case config.LogsDataType:
var proc component.LogsProcessor
proc, err = factory.CreateLogsProcessor(ctx, creationParams, procCfg, lc)
if proc != nil {
mutatesConsumedData = mutatesConsumedData || proc.GetCapabilities().MutatesConsumedData
}
processors[i] = proc
lc = proc
default:
return nil, fmt.Errorf("error creating processor %q in pipeline %q, data type %s is not supported",
procName, pipelineCfg.Name, pipelineCfg.InputType)
}
if err != nil {
return nil, fmt.Errorf("error creating processor %q in pipeline %q: %v",
procName, pipelineCfg.Name, err)
}
// Check if the factory really created the processor.
if tc == nil && mc == nil && lc == nil {
return nil, fmt.Errorf("factory for %q produced a nil processor", procCfg.Name())
}
}
pipelineLogger := pb.logger.With(zap.String("pipeline_name", pipelineCfg.Name),
zap.String("pipeline_datatype", string(pipelineCfg.InputType)))
pipelineLogger.Info("Pipeline was built.")
bp := &builtPipeline{
pipelineLogger,
tc,
mc,
lc,
mutatesConsumedData,
processors,
}
return bp, nil
}
// Converts the list of exporter names to a list of corresponding builtExporters.
func (pb *pipelinesBuilder) getBuiltExportersByNames(exporterNames []string) []*builtExporter {
var result []*builtExporter
for _, name := range exporterNames {
exporter := pb.exporters[pb.config.Exporters[name]]
result = append(result, exporter)
}
return result
}
func (pb *pipelinesBuilder) buildFanoutExportersTraceConsumer(exporterNames []string) consumer.Traces {
builtExporters := pb.getBuiltExportersByNames(exporterNames)
var exporters []consumer.Traces
for _, builtExp := range builtExporters {
exporters = append(exporters, builtExp.getTracesExporter())
}
// Create a junction point that fans out to all exporters.
return fanoutconsumer.NewTraces(exporters)
}
func (pb *pipelinesBuilder) buildFanoutExportersMetricsConsumer(exporterNames []string) consumer.Metrics {
builtExporters := pb.getBuiltExportersByNames(exporterNames)
var exporters []consumer.Metrics
for _, builtExp := range builtExporters {
exporters = append(exporters, builtExp.getMetricExporter())
}
// Create a junction point that fans out to all exporters.
return fanoutconsumer.NewMetrics(exporters)
}
func (pb *pipelinesBuilder) buildFanoutExportersLogConsumer(exporterNames []string) consumer.Logs {
builtExporters := pb.getBuiltExportersByNames(exporterNames)
exporters := make([]consumer.Logs, len(builtExporters))
for i, builtExp := range builtExporters {
exporters[i] = builtExp.getLogExporter()
}
// Create a junction point that fans out to all exporters.
return fanoutconsumer.NewLogs(exporters)
}