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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kati
import (
"fmt"
"io"
"os"
"sort"
"sync"
"time"
)
type traceEventT struct {
mu sync.Mutex
f io.WriteCloser
t0 time.Time
pid int
}
const (
traceEventMain = iota + 1
// add new ones to use new goroutine.
)
var traceEvent traceEventT
// TraceEventStart starts trace event.
func TraceEventStart(f io.WriteCloser) {
traceEvent.start(f)
}
// TraceEventStop stops trace event.
func TraceEventStop() {
traceEvent.stop()
}
func (t *traceEventT) start(f io.WriteCloser) {
t.f = f
t.t0 = time.Now()
fmt.Fprint(t.f, "[ ")
}
func (t *traceEventT) enabled() bool {
return t.f != nil
}
func (t *traceEventT) stop() {
fmt.Fprint(t.f, "\n]\n")
t.f.Close()
}
type event struct {
name, v string
tid int
t time.Time
emit bool
}
func (t *traceEventT) begin(name string, v Value, tid int) event {
var e event
e.tid = tid
e.t = time.Now()
if t.f != nil || EvalStatsFlag {
e.name = name
e.v = v.String()
}
if t.f != nil {
e.emit = name == "include" || name == "shell"
if e.emit {
t.emit("B", e, e.t.Sub(t.t0))
}
}
return e
}
func (t *traceEventT) emit(ph string, e event, ts time.Duration) {
t.mu.Lock()
defer t.mu.Unlock()
if t.pid == 0 {
t.pid = os.Getpid()
} else {
fmt.Fprintf(t.f, ",\n")
}
fmt.Fprintf(t.f, `{"pid":%d,"tid":%d,"ts":%d,"ph":%q,"cat":%q,"name":%q,"args":{}}`,
t.pid,
e.tid,
ts.Nanoseconds()/1e3,
ph,
e.name,
e.v,
)
}
func (t *traceEventT) end(e event) {
if t.f != nil {
if e.emit {
t.emit("E", e, time.Since(t.t0))
}
}
stats.add(e.name, e.v, e.t)
}
type statsData struct {
Name string
Count int
Longest time.Duration
Total time.Duration
}
type statsT struct {
mu sync.Mutex
data map[string]statsData
}
var stats = &statsT{
data: make(map[string]statsData),
}
func (s *statsT) add(name, v string, t time.Time) {
if !EvalStatsFlag {
return
}
d := time.Since(t)
key := fmt.Sprintf("%s:%s", name, v)
s.mu.Lock()
sd := s.data[key]
if d > sd.Longest {
sd.Longest = d
}
sd.Total += d
sd.Count++
s.data[key] = sd
s.mu.Unlock()
}
// DumpStats dumps statistics collected if EvalStatsFlag is set.
func DumpStats() {
if !EvalStatsFlag {
return
}
var sv byTotalTime
for k, v := range stats.data {
v.Name = k
sv = append(sv, v)
}
sort.Sort(sv)
fmt.Println("count,longest(ns),total(ns),longest,total,name")
for _, s := range sv {
fmt.Printf("%d,%d,%d,%v,%v,%s\n", s.Count, s.Longest, s.Total, s.Longest, s.Total, s.Name)
}
}
type byTotalTime []statsData
func (b byTotalTime) Len() int { return len(b) }
func (b byTotalTime) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
func (b byTotalTime) Less(i, j int) bool {
return b[i].Total > b[j].Total
}
type shellStatsT struct {
mu sync.Mutex
duration time.Duration
count int
}
var shellStats = &shellStatsT{}
func (s *shellStatsT) add(d time.Duration) {
s.mu.Lock()
s.duration += d
s.count++
s.mu.Unlock()
}
func (s *shellStatsT) Duration() time.Duration {
s.mu.Lock()
defer s.mu.Unlock()
return s.duration
}
func (s *shellStatsT) Count() int {
s.mu.Lock()
defer s.mu.Unlock()
return s.count
}
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