/
tracing.go
142 lines (116 loc) · 3.02 KB
/
tracing.go
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package internal
import (
"context"
"errors"
"fmt"
"io"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"go.uber.org/atomic"
)
type tracingReader struct {
span opentracing.Span
t *TracingInterceptor
r io.ReadCloser
call *Call
byteCount int64
logged atomic.Bool
}
func (r *tracingReader) traceFinish(err error) {
if !r.logged.Swap(true) {
r.t.traceFinish(r.span, err, opentracing.Tag{Key: "bytes_read", Value: r.byteCount})
}
}
func (r *tracingReader) Close() error {
r.traceFinish(errors.New("request interrupted"))
return r.r.Close()
}
func (r *tracingReader) Read(p []byte) (n int, err error) {
n, err = r.r.Read(p)
r.byteCount += int64(n)
if err != nil {
if err == io.EOF {
r.traceFinish(nil)
} else {
r.traceFinish(err)
}
}
return
}
type tracingWriter struct {
span opentracing.Span
t *TracingInterceptor
w io.WriteCloser
call *Call
byteCount int64
logged atomic.Bool
}
func (w *tracingWriter) traceFinish(err error) {
if !w.logged.Swap(true) {
w.t.traceFinish(w.span, err, opentracing.Tag{Key: "bytes_written", Value: w.byteCount})
}
}
func (w *tracingWriter) Write(p []byte) (n int, err error) {
n, err = w.w.Write(p)
w.byteCount += int64(n)
if err != nil {
w.traceFinish(err)
}
return
}
func (w *tracingWriter) Close() error {
err := w.w.Close()
w.traceFinish(err)
return err
}
type TracingInterceptor struct {
opentracing.Tracer
}
func (t *TracingInterceptor) traceStart(ctx context.Context, call *Call) (span opentracing.Span, retCtx context.Context) {
span, retCtx = opentracing.StartSpanFromContextWithTracer(ctx, t.Tracer, string(call.Params.HTTPVerb()), ext.SpanKindRPCClient)
ext.Component.Set(span, "yt")
span.SetTag("call_id", call.CallID.String())
for _, field := range call.Params.Log() {
if value, ok := field.Any().(fmt.Stringer); ok {
span.SetTag(field.Key(), value.String())
}
}
return
}
func (t *TracingInterceptor) traceFinish(span opentracing.Span, err error, tags ...opentracing.Tag) {
if err != nil {
ext.LogError(span, err)
}
for _, tag := range tags {
span.SetTag(tag.Key, tag.Value)
}
span.Finish()
}
func (t *TracingInterceptor) Intercept(ctx context.Context, call *Call, invoke CallInvoker) (res *CallResult, err error) {
span, ctx := t.traceStart(ctx, call)
res, err = invoke(ctx, call)
t.traceFinish(span, err)
return
}
func (t *TracingInterceptor) Read(ctx context.Context, call *Call, invoke ReadInvoker) (r io.ReadCloser, err error) {
span, ctx := t.traceStart(ctx, call)
r, err = invoke(ctx, call)
if err != nil {
return
}
r = &tracingReader{span: span, t: t, r: r, call: call}
return
}
func (t *TracingInterceptor) Write(ctx context.Context, call *Call, invoke WriteInvoker) (w io.WriteCloser, err error) {
span, ctx := t.traceStart(ctx, call)
w, err = invoke(ctx, call)
if err != nil {
return
}
lw := &tracingWriter{span: span, t: t, w: w, call: call}
if call.RowBatch != nil {
lw.byteCount = int64(call.RowBatch.Len())
}
w = lw
return
}