92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
package tracing
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import (
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"context"
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"encoding/base64"
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"errors"
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"sync"
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coltracepb "go.opentelemetry.io/proto/otlp/collector/trace/v1"
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tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
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"google.golang.org/protobuf/proto"
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)
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const (
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MaxTraceAmount = 20
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)
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var (
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errNoTraces = errors.New("no traces recorded to be exported")
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errNoopTracer = errors.New("noop tracer has no traces")
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)
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type InMemoryClient interface {
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// Spans returns a copy of the list of in-memory stored spans as a base64
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// encoded otlp protobuf string.
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Spans() (string, error)
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}
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// InMemoryOtlpClient is a client implementation for otlptrace.Client
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type InMemoryOtlpClient struct {
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mu sync.Mutex
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spans []*tracepb.ResourceSpans
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}
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func (mc *InMemoryOtlpClient) Start(_ context.Context) error {
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return nil
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}
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func (mc *InMemoryOtlpClient) Stop(_ context.Context) error {
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return nil
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}
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// UploadTraces adds the provided list of spans to the in-memory list.
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func (mc *InMemoryOtlpClient) UploadTraces(_ context.Context, protoSpans []*tracepb.ResourceSpans) error {
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mc.mu.Lock()
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defer mc.mu.Unlock()
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// Catch to make sure too many traces aren't being added to response header.
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// Returning nil makes sure we don't fail to send the traces we already recorded.
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if len(mc.spans)+len(protoSpans) > MaxTraceAmount {
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return nil
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}
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mc.spans = append(mc.spans, protoSpans...)
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return nil
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}
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// Spans returns the list of in-memory stored spans as a base64 encoded otlp protobuf string.
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func (mc *InMemoryOtlpClient) Spans() (string, error) {
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mc.mu.Lock()
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defer mc.mu.Unlock()
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if len(mc.spans) <= 0 {
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return "", errNoTraces
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}
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pbRequest := &coltracepb.ExportTraceServiceRequest{
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ResourceSpans: mc.spans,
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}
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data, err := proto.Marshal(pbRequest)
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if err != nil {
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return "", err
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}
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return base64.StdEncoding.EncodeToString(data), nil
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}
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// NoopOtlpClient is a client implementation for otlptrace.Client that does nothing
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type NoopOtlpClient struct{}
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func (mc *NoopOtlpClient) Start(_ context.Context) error {
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return nil
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}
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func (mc *NoopOtlpClient) Stop(_ context.Context) error {
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return nil
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}
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func (mc *NoopOtlpClient) UploadTraces(_ context.Context, _ []*tracepb.ResourceSpans) error {
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return nil
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}
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// Spans always returns no traces error
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func (mc *NoopOtlpClient) Spans() (string, error) {
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return "", errNoopTracer
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}
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