82 lines
2.7 KiB
Go
82 lines
2.7 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package fanoutconsumer // import "go.opentelemetry.io/collector/internal/fanoutconsumer"
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import (
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"context"
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"go.uber.org/multierr"
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"go.opentelemetry.io/collector/consumer"
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"go.opentelemetry.io/collector/pdata/ptrace"
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)
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// NewTraces wraps multiple trace consumers in a single one.
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// It fans out the incoming data to all the consumers, and does smart routing:
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// - Clones only to the consumer that needs to mutate the data.
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// - If all consumers needs to mutate the data one will get the original mutable data.
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func NewTraces(tcs []consumer.Traces) consumer.Traces {
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// Don't wrap if there is only one non-mutating consumer.
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if len(tcs) == 1 && !tcs[0].Capabilities().MutatesData {
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return tcs[0]
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}
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tc := &tracesConsumer{}
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for i := 0; i < len(tcs); i++ {
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if tcs[i].Capabilities().MutatesData {
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tc.mutable = append(tc.mutable, tcs[i])
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} else {
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tc.readonly = append(tc.readonly, tcs[i])
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}
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}
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return tc
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}
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type tracesConsumer struct {
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mutable []consumer.Traces
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readonly []consumer.Traces
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}
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func (tsc *tracesConsumer) Capabilities() consumer.Capabilities {
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// If all consumers are mutating, then the original data will be passed to one of them.
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return consumer.Capabilities{MutatesData: len(tsc.mutable) > 0 && len(tsc.readonly) == 0}
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}
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// ConsumeTraces exports the ptrace.Traces to all consumers wrapped by the current one.
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func (tsc *tracesConsumer) ConsumeTraces(ctx context.Context, td ptrace.Traces) error {
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var errs error
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if len(tsc.mutable) > 0 {
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// Clone the data before sending to all mutating consumers except the last one.
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for i := 0; i < len(tsc.mutable)-1; i++ {
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errs = multierr.Append(errs, tsc.mutable[i].ConsumeTraces(ctx, cloneTraces(td)))
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}
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// Send data as is to the last mutating consumer only if there are no other non-mutating consumers and the
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// data is mutable. Never share the same data between a mutating and a non-mutating consumer since the
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// non-mutating consumer may process data async and the mutating consumer may change the data before that.
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lastConsumer := tsc.mutable[len(tsc.mutable)-1]
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if len(tsc.readonly) == 0 && !td.IsReadOnly() {
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errs = multierr.Append(errs, lastConsumer.ConsumeTraces(ctx, td))
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} else {
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errs = multierr.Append(errs, lastConsumer.ConsumeTraces(ctx, cloneTraces(td)))
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}
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}
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// Mark the data as read-only if it will be sent to more than one read-only consumer.
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if len(tsc.readonly) > 1 && !td.IsReadOnly() {
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td.MarkReadOnly()
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}
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for _, tc := range tsc.readonly {
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errs = multierr.Append(errs, tc.ConsumeTraces(ctx, td))
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}
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return errs
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}
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func cloneTraces(td ptrace.Traces) ptrace.Traces {
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clonedTraces := ptrace.NewTraces()
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td.CopyTo(clonedTraces)
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return clonedTraces
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}
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