// Data returns a JSON response with the provided data and HTTP status
// code.
func Data(ctx context.Context, w http.ResponseWriter, status int, data interface{}) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(status)
if err := json.NewEncoder(w).Encode(data); isBrokenPipe(err) {
reqlog.Print(ctx, "unable to respond to client. event=respond_broken_pipe")
metrics.Increment("respond_broken_pipe")
} else if err != nil {
panic(err)
}
}
// WrapPanicC wraps a goji.Handler to catch panics, log relevant
// information and return an InternalFailure to the user.
func WrapPanicC(h goji.Handler) goji.Handler {
return goji.HandlerFunc(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
defer func() {
err := recover()
if err == nil {
return
}
metrics.Increment("http.panics")
id := fmt.Sprintf("%016x", rand.Int63())
var lines []string
first := "event=panic"
pc, file, line, ok := runtime.Caller(3)
if ok {
f := runtime.FuncForPC(pc)
first = fmt.Sprintf("%s:%d %s() %s", file, line, f.Name(), first)
}
lines = append(lines, first)
if wrapped, ok := err.(*errors.Err); ok {
for _, line := range wrapped.StackTrace() {
lines = append(lines, line)
}
}
if len(lines) > 1 {
logMutex.Lock()
defer logMutex.Unlock()
}
for _, line := range lines {
reqlog.Printf(ctx, "(panic=%s) %s", id, line)
}
Error(ctx, w, http.StatusInternalServerError, usererrors.InternalFailure{id})
}()
h.ServeHTTPC(ctx, w, r)
})
}
// WrapPanicC wraps a goji.Handler to catch panics, log relevant
// information and return an InternalFailure to the user.
func WrapPanicC(h goji.Handler) goji.Handler {
return goji.HandlerFunc(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
defer func() {
recovered := recover()
if recovered == nil {
return
}
err, ok := recovered.(error)
if !ok {
err = fmt.Errorf("%s", err)
}
metrics.Increment("http.panics")
logError(ctx, err, "panic")
UserError(ctx, w, http.StatusInternalServerError, usererrors.InternalFailure{})
}()
h.ServeHTTPC(ctx, w, r)
})
}