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Use golang.org/x/exp/trace to implement an trace recorder that saves the trace to a circular buffer and can be retrieved at any time. Debug endpoints have been added under /debug/flight to start and stop the trace as well as to set its period. Due to golang.org/x/exp/trace, the minimum go version has been bumped to 1.22 Signed-off-by: Alberto Garcia Hierro <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "golang.org/x/exp/trace" | ||
| ) | ||
|
|
||
| type flightRecorder struct { | ||
| mu sync.Mutex | ||
| cond *sync.Cond | ||
| recorder *trace.FlightRecorder | ||
| } | ||
|
|
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| func newFlightRecorder() *flightRecorder { | ||
| dbg := &flightRecorder{ | ||
| recorder: trace.NewFlightRecorder(), | ||
| } | ||
| dbg.cond = sync.NewCond(&dbg.mu) | ||
| return dbg | ||
| } | ||
|
|
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| func (r *flightRecorder) StartTrace(w http.ResponseWriter, req *http.Request) { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| if r.recorder.Enabled() { | ||
| http.Error(w, "flight recorder is already running", http.StatusConflict) | ||
| return | ||
| } | ||
| if err := r.recorder.Start(); err != nil { | ||
| http.Error(w, fmt.Sprintf("could not start flight recorder: %s", err), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| func (r *flightRecorder) StopTrace(w http.ResponseWriter, req *http.Request) { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| if !r.recorder.Enabled() { | ||
| http.Error(w, "flight recorder is not running", http.StatusConflict) | ||
| return | ||
| } | ||
| if err := r.recorder.Stop(); err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| func (r *flightRecorder) SetTracePeriod(w http.ResponseWriter, req *http.Request) { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| if r.recorder.Enabled() { | ||
| http.Error(w, "flight recorder is running, stop it to change its period", http.StatusPreconditionFailed) | ||
| return | ||
| } | ||
| periodValue := req.FormValue("period") | ||
| period, err := time.ParseDuration(periodValue) | ||
| if err != nil { | ||
| http.Error(w, fmt.Sprintf("invalid flight recorder period: %s", err), http.StatusBadRequest) | ||
| } | ||
| r.recorder.SetPeriod(period) | ||
| } | ||
|
|
||
| func (r *flightRecorder) Trace(w http.ResponseWriter, req *http.Request) { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| w.Header().Set("Content-Type", "application/octet-stream") | ||
| w.Header().Set("Content-Disposition", `attachment; filename="trace"`) | ||
| if _, err := r.recorder.WriteTo(w); err != nil { | ||
| http.Error(w, fmt.Sprintf("could not write in-flight trace: %s", err), http.StatusInternalServerError) | ||
| } | ||
| } | ||
|
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| func setupDebugFlight(m *http.ServeMux) { | ||
| r := newFlightRecorder() | ||
|
|
||
| const ( | ||
| flightPattern = "/debug/flight" | ||
| flightTracePattern = flightPattern + "/trace" | ||
| ) | ||
|
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| m.HandleFunc("POST "+flightTracePattern+"/start", r.StartTrace) | ||
| m.HandleFunc("POST "+flightTracePattern+"/stop", r.StopTrace) | ||
| m.HandleFunc("POST "+flightTracePattern+"/set_period", r.SetTracePeriod) | ||
| m.HandleFunc("GET "+flightTracePattern, r.Trace) | ||
| } |
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