Files
Stephan BehnkeandGitHub 7c9a168a73 Export OTEL traces per test case (#7955)
## What changed?

Exporting an OTEL trace file _per test case_ instead of _per test
suite_.

I also added a new `MemoryExporter` to make the OTEL collection more
efficient and accurate.
Compared to the previous approach, it acts completely
in-process/in-memory; not via gRPC.

## Why?

Removes successful test cases from the file output which makes the
output smaller and easier to use.

Also removes race condition.

Also more efficient.

## How did you test it?
- [ ] built
- [ ] run locally and tested manually
- [x] covered by existing tests
- [ ] added new unit test(s)
- [ ] added new functional test(s)

Example:

<img width="786" alt="Screenshot 2025-06-24 at 2 25 17 PM"
src="https://github.com/user-attachments/assets/b3bb1916-1524-4889-be3b-57ef296b027c"
/>
2025-06-25 11:38:55 -07:00

73 lines
1.6 KiB
Go

package testtelemetry
import (
"context"
"fmt"
"net"
"sync"
"testing"
ctrace "go.opentelemetry.io/proto/otlp/collector/trace/v1"
trace "go.opentelemetry.io/proto/otlp/trace/v1"
"go.temporal.io/server/common/testing/freeport"
"google.golang.org/grpc"
)
var _ ctrace.TraceServiceServer = (*MemoryCollector)(nil)
// MemoryCollector is a gRPC-based OTEL collector that collects spans in memory.
type MemoryCollector struct {
ctrace.UnimplementedTraceServiceServer
addr string
spansLock sync.RWMutex
spans []*trace.ResourceSpans
}
func StartMemoryCollector(tb testing.TB) (*MemoryCollector, error) {
grpcServer := grpc.NewServer()
l := &MemoryCollector{
addr: fmt.Sprintf("localhost:%d", freeport.MustGetFreePort()),
}
ctrace.RegisterTraceServiceServer(grpcServer, l)
listener, err := net.Listen("tcp", l.addr)
if err != nil {
return nil, err
}
go func() {
if err := grpcServer.Serve(listener); err != nil {
tb.Errorf("OTEL logger failed to start: %v", err)
}
}()
go func() {
<-tb.Context().Done()
grpcServer.Stop()
}()
return l, nil
}
func (l *MemoryCollector) Addr() string {
return "http://" + l.addr
}
func (l *MemoryCollector) Spans() []*trace.ResourceSpans {
l.spansLock.RLock()
defer l.spansLock.RUnlock()
return l.spans
}
func (l *MemoryCollector) Export(
ctx context.Context,
request *ctrace.ExportTraceServiceRequest,
) (*ctrace.ExportTraceServiceResponse, error) {
l.spansLock.Lock()
defer l.spansLock.Unlock()
l.spans = append(l.spans, request.ResourceSpans...)
return &ctrace.ExportTraceServiceResponse{}, nil
}