// RecordSpan converts a RawSpan into the Appdash representation of a span
// and records it to the underlying collector.
func (r *Recorder) RecordSpan(sp basictracer.RawSpan) {
if !sp.Sampled {
return
}
spanID := appdash.SpanID{
Span: appdash.ID(uint64(sp.SpanID)),
Trace: appdash.ID(uint64(sp.TraceID)),
Parent: appdash.ID(uint64(sp.ParentSpanID)),
}
r.collectEvent(spanID, appdash.SpanName(sp.Operation))
// Record all of the logs. Payloads are thrown out.
for _, log := range sp.Logs {
r.collectEvent(spanID, appdash.LogWithTimestamp(log.Event, log.Timestamp))
}
for key, value := range sp.Tags {
val := []byte(fmt.Sprintf("%+v", value))
r.collectAnnotation(spanID, appdash.Annotation{Key: key, Value: val})
}
for key, val := range sp.Baggage {
r.collectAnnotation(spanID, appdash.Annotation{Key: key, Value: []byte(val)})
}
// Add the duration to the start time to get an approximate end time.
approxEndTime := sp.Start.Add(sp.Duration)
r.collectEvent(spanID, appdash.Timespan{S: sp.Start, E: approxEndTime})
}
func sampleData(c appdash.Collector) error {
const numTraces = 60
log.Printf("Adding sample data (%d traces)", numTraces)
for i := appdash.ID(1); i <= numTraces; i++ {
traceID := appdash.NewRootSpanID()
traceRec := appdash.NewRecorder(traceID, c)
traceRec.Name(fakeHosts[rand.Intn(len(fakeHosts))])
// A random length for the trace.
length := time.Duration(rand.Intn(1000)) * time.Millisecond
startTime := time.Now().Add(-time.Duration(rand.Intn(100)) * time.Minute)
traceRec.Event(&sqltrace.SQLEvent{
ClientSend: startTime,
ClientRecv: startTime.Add(length),
SQL: "SELECT * FROM table_name;",
Tag: fmt.Sprintf("fakeTag%d", rand.Intn(10)),
})
// We'll split the trace into N (3-7) spans (i.e. "N operations") each with
// a random duration of time adding up to the length of the trace.
numSpans := rand.Intn(7-3) + 3
times := randomSplit(int(length/time.Millisecond), numSpans)
lastSpanID := traceID
for j := 1; j <= numSpans; j++ {
// The parent span is the predecessor.
spanID := appdash.NewSpanID(lastSpanID)
rec := appdash.NewRecorder(spanID, c)
rec.Name(fakeNames[(j+int(i))%len(fakeNames)])
if j%3 == 0 {
rec.Log("hello")
}
if j%5 == 0 {
rec.Msg("hi")
}
// Generate a span event.
spanDuration := time.Duration(times[j-1]) * time.Millisecond
rec.Event(&sqltrace.SQLEvent{
ClientSend: startTime,
ClientRecv: startTime.Add(spanDuration),
SQL: "SELECT * FROM table_name;",
Tag: fmt.Sprintf("fakeTag%d", rand.Intn(10)),
})
// Shift the start time forward.
startTime = startTime.Add(spanDuration)
// Check for any recorder errors.
if errs := rec.Errors(); len(errs) > 0 {
return fmt.Errorf("recorder errors: %v", errs)
}
lastSpanID = spanID
}
}
return nil
}