import (
"bytes"
+ "context"
"fmt"
"html/template"
"io"
"log"
"net"
"net/http"
+ "net/url"
"runtime"
"sort"
"strconv"
// FOR DEBUGGING ONLY. This will slow down the program.
var DebugUseAfterFinish = false
+// HTTP ServeMux paths.
+const (
+ debugRequestsPath = "/debug/requests"
+ debugEventsPath = "/debug/events"
+)
+
// AuthRequest determines whether a specific request is permitted to load the
// /debug/requests or /debug/events pages.
//
}
func init() {
+ _, pat := http.DefaultServeMux.Handler(&http.Request{URL: &url.URL{Path: debugRequestsPath}})
+ if pat == debugRequestsPath {
+ panic("/debug/requests is already registered. You may have two independent copies of " +
+ "golang.org/x/net/trace in your binary, trying to maintain separate state. This may " +
+ "involve a vendored copy of golang.org/x/net/trace.")
+ }
+
// TODO(jbd): Serve Traces from /debug/traces in the future?
// There is no requirement for a request to be present to have traces.
- http.HandleFunc("/debug/requests", Traces)
- http.HandleFunc("/debug/events", Events)
+ http.HandleFunc(debugRequestsPath, Traces)
+ http.HandleFunc(debugEventsPath, Events)
+}
+
+// NewContext returns a copy of the parent context
+// and associates it with a Trace.
+func NewContext(ctx context.Context, tr Trace) context.Context {
+ return context.WithValue(ctx, contextKey, tr)
+}
+
+// FromContext returns the Trace bound to the context, if any.
+func FromContext(ctx context.Context) (tr Trace, ok bool) {
+ tr, ok = ctx.Value(contextKey).(Trace)
+ return
}
// Traces responds with traces from the program.
}
func (tr *trace) Finish() {
- tr.Elapsed = time.Now().Sub(tr.Start)
+ elapsed := time.Now().Sub(tr.Start)
+ tr.mu.Lock()
+ tr.Elapsed = elapsed
+ tr.mu.Unlock()
+
if DebugUseAfterFinish {
buf := make([]byte, 4<<10) // 4 KB should be enough
n := runtime.Stack(buf, false)
m.Remove(tr)
f := getFamily(tr.Family, true)
+ tr.mu.RLock() // protects tr fields in Cond.match calls
for _, b := range f.Buckets {
if b.Cond.match(tr) {
b.Add(tr)
}
}
+ tr.mu.RUnlock()
+
// Add a sample of elapsed time as microseconds to the family's timeseries
h := new(histogram)
- h.addMeasurement(tr.Elapsed.Nanoseconds() / 1e3)
+ h.addMeasurement(elapsed.Nanoseconds() / 1e3)
f.LatencyMu.Lock()
f.Latency.Add(h)
f.LatencyMu.Unlock()
// Title is the title of this trace.
Title string
- // Timing information.
- Start time.Time
- Elapsed time.Duration // zero while active
-
- // Trace information if non-zero.
- traceID uint64
- spanID uint64
+ // Start time of the this trace.
+ Start time.Time
- // Whether this trace resulted in an error.
- IsError bool
-
- // Append-only sequence of events (modulo discards).
mu sync.RWMutex
- events []event
+ events []event // Append-only sequence of events (modulo discards).
maxEvents int
+ recycler func(interface{})
+ IsError bool // Whether this trace resulted in an error.
+ Elapsed time.Duration // Elapsed time for this trace, zero while active.
+ traceID uint64 // Trace information if non-zero.
+ spanID uint64
- refs int32 // how many buckets this is in
- recycler func(interface{})
- disc discarded // scratch space to avoid allocation
+ refs int32 // how many buckets this is in
+ disc discarded // scratch space to avoid allocation
finishStack []byte // where finish was called, if DebugUseAfterFinish is set
tr.Family = ""
tr.Title = ""
tr.Start = time.Time{}
+
+ tr.mu.Lock()
tr.Elapsed = 0
tr.traceID = 0
tr.spanID = 0
tr.IsError = false
tr.maxEvents = 0
tr.events = nil
- tr.refs = 0
tr.recycler = nil
+ tr.mu.Unlock()
+
+ tr.refs = 0
tr.disc = 0
tr.finishStack = nil
for i := range tr.eventsBuf {
tr.addEvent(&lazySprintf{format, a}, false, false)
}
-func (tr *trace) SetError() { tr.IsError = true }
+func (tr *trace) SetError() {
+ tr.mu.Lock()
+ tr.IsError = true
+ tr.mu.Unlock()
+}
func (tr *trace) SetRecycler(f func(interface{})) {
+ tr.mu.Lock()
tr.recycler = f
+ tr.mu.Unlock()
}
func (tr *trace) SetTraceInfo(traceID, spanID uint64) {
+ tr.mu.Lock()
tr.traceID, tr.spanID = traceID, spanID
+ tr.mu.Unlock()
}
func (tr *trace) SetMaxEvents(m int) {
+ tr.mu.Lock()
// Always keep at least three events: first, discarded count, last.
if len(tr.events) == 0 && m > 3 {
tr.maxEvents = m
}
+ tr.mu.Unlock()
}
func (tr *trace) ref() {
func (tr *trace) unref() {
if atomic.AddInt32(&tr.refs, -1) == 0 {
+ tr.mu.RLock()
if tr.recycler != nil {
// freeTrace clears tr, so we hold tr.recycler and tr.events here.
go func(f func(interface{}), es []event) {
}
}(tr.recycler, tr.events)
}
+ tr.mu.RUnlock()
freeTrace(tr)
}
}
func (tr *trace) ElapsedTime() string {
+ tr.mu.RLock()
t := tr.Elapsed
+ tr.mu.RUnlock()
+
if t == 0 {
// Active trace.
t = time.Since(tr.Start)
projects / github / fretlink / terraform-provider-statuscake.git / blobdiff