cloudflared-mirror/tracing/client.go

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2022-04-06 23:20:29 +00:00
package tracing
import (
"context"
"encoding/base64"
"errors"
"sync"
coltracepb "go.opentelemetry.io/proto/otlp/collector/trace/v1"
tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
"google.golang.org/protobuf/proto"
)
const (
maxTraceAmount = 20
)
var (
errNoTraces = errors.New("no traces recorded to be exported")
errNoopTracer = errors.New("noop tracer has no traces")
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)
type InMemoryClient interface {
// Spans returns a copy of the list of in-memory stored spans as a base64
// encoded otlp protobuf string.
Spans() (string, error)
}
// InMemoryOtlpClient is a client implementation for otlptrace.Client
type InMemoryOtlpClient struct {
mu sync.Mutex
spans []*tracepb.ResourceSpans
}
func (mc *InMemoryOtlpClient) Start(_ context.Context) error {
return nil
}
func (mc *InMemoryOtlpClient) Stop(_ context.Context) error {
return nil
}
// UploadTraces adds the provided list of spans to the in-memory list.
func (mc *InMemoryOtlpClient) UploadTraces(_ context.Context, protoSpans []*tracepb.ResourceSpans) error {
mc.mu.Lock()
defer mc.mu.Unlock()
// Catch to make sure too many traces aren't being added to response header.
// Returning nil makes sure we don't fail to send the traces we already recorded.
if len(mc.spans)+len(protoSpans) > maxTraceAmount {
return nil
}
mc.spans = append(mc.spans, protoSpans...)
return nil
}
// Spans returns the list of in-memory stored spans as a base64 encoded otlp protobuf string.
func (mc *InMemoryOtlpClient) Spans() (string, error) {
mc.mu.Lock()
defer mc.mu.Unlock()
if len(mc.spans) <= 0 {
return "", errNoTraces
}
pbRequest := &coltracepb.ExportTraceServiceRequest{
ResourceSpans: mc.spans,
}
data, err := proto.Marshal(pbRequest)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(data), nil
}
// NoopOtlpClient is a client implementation for otlptrace.Client that does nothing
type NoopOtlpClient struct{}
func (mc *NoopOtlpClient) Start(_ context.Context) error {
return nil
}
func (mc *NoopOtlpClient) Stop(_ context.Context) error {
return nil
}
func (mc *NoopOtlpClient) UploadTraces(_ context.Context, _ []*tracepb.ResourceSpans) error {
return nil
}
// Spans always returns no traces error
func (mc *NoopOtlpClient) Spans() (string, error) {
return "", errNoopTracer
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}