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tracer.go
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tracer.go
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// Copyright (C) 2018 Google Inc.
//
// 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 status
import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"runtime"
"sync"
"time"
)
const (
eventDurtationStart = "B"
eventDurtationEnd = "E"
eventInstance = "i"
eventMemoryDump = "v"
)
type traceEvent struct {
Name string `json:"name,omitempty"`
ProcessID uint64 `json:"pid"`
TaskID uint64 `json:"tid"`
EventType string `json:"ph"`
Timestamp int64 `json:"ts"`
Scope string `json:"s,omitempty"`
Args map[string]interface{} `json:"args,omitempty"`
ID string `json:"id,omitempty"`
}
// RegisterTracer registers a status listener that writes all status updates in
// the Chrome Trace Event Format to the writer w.
// See https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU
// for documentation on the trace event format.
func RegisterTracer(w io.Writer) Unregister {
l := &statusTracer{
writer: w,
processID: os.Getpid(),
start: time.Now(),
taskIDs: map[*Task]uint64{},
}
w.Write([]byte("["))
app.Traverse(l.begin)
return RegisterListener(l)
}
type statusTracer struct {
writer io.Writer
start time.Time
processID int
taskIDs map[*Task]uint64
freeTaskIDs []uint64
nextAllocTaskID uint64
nextMemoryID uint64
mutex sync.Mutex
}
func (s *statusTracer) allocTaskID() uint64 {
if len(s.freeTaskIDs) > 0 {
tid := s.freeTaskIDs[len(s.freeTaskIDs)-1]
s.freeTaskIDs = s.freeTaskIDs[:len(s.freeTaskIDs)-1]
return tid
}
tid := s.nextAllocTaskID
s.nextAllocTaskID++
return tid
}
func (s *statusTracer) freeTaskID(tid uint64) {
s.freeTaskIDs = append(s.freeTaskIDs, tid)
}
func (s *statusTracer) OnTaskStart(ctx context.Context, t *Task) {
s.mutex.Lock()
defer s.mutex.Unlock()
s.begin(t)
}
func (s *statusTracer) OnTaskProgress(ctx context.Context, t *Task) {}
func (s *statusTracer) OnTaskBlock(ctx context.Context, t *Task) {}
func (s *statusTracer) OnTaskUnblock(ctx context.Context, t *Task) {}
func (s *statusTracer) OnTaskFinish(ctx context.Context, t *Task) {
s.mutex.Lock()
defer s.mutex.Unlock()
s.end(t)
}
func (s *statusTracer) OnEvent(ctx context.Context, t *Task, n string, scope EventScope) {
s.mutex.Lock()
defer s.mutex.Unlock()
s.event(ctx, t, n, scope)
}
func (s *statusTracer) OnMemorySnapshot(ctx context.Context, stats runtime.MemStats) {
s.mutex.Lock()
defer s.mutex.Unlock()
s.memorySnapshot(ctx, stats)
}
func (s *statusTracer) begin(t *Task) {
e := traceEvent{
Name: t.name,
EventType: eventDurtationStart,
Timestamp: time.Since(s.start).Nanoseconds() / 1000,
ProcessID: uint64(s.processID),
}
if t.parent == &app {
e.TaskID = s.allocTaskID()
} else {
e.TaskID = s.taskIDs[t.parent]
}
s.taskIDs[t] = e.TaskID
b, _ := json.Marshal(e)
s.writer.Write([]byte("\n"))
s.writer.Write(b)
s.writer.Write([]byte(","))
}
func (s *statusTracer) end(t *Task) {
e := traceEvent{
Name: "",
TaskID: s.taskIDs[t],
EventType: eventDurtationEnd,
Timestamp: time.Since(s.start).Nanoseconds() / 1000,
ProcessID: uint64(s.processID),
}
delete(s.taskIDs, t)
if t.parent == &app {
s.freeTaskID(e.TaskID)
}
b, _ := json.Marshal(e)
s.writer.Write([]byte("\n"))
s.writer.Write(b)
s.writer.Write([]byte(","))
}
func (s *statusTracer) event(ctx context.Context, t *Task, n string, scope EventScope) {
tid := uint64(0)
sc := "g"
switch scope {
case TaskScope:
tid, sc = t.id, "t"
case GlobalScope:
sc = "g"
case ProcessScope:
sc = "p"
}
e := traceEvent{
Name: n,
TaskID: tid,
EventType: eventInstance,
Timestamp: time.Since(s.start).Nanoseconds() / 1000,
ProcessID: uint64(s.processID),
Scope: sc,
}
b, _ := json.Marshal(e)
s.writer.Write([]byte("\n"))
s.writer.Write(b)
s.writer.Write([]byte(","))
}
func (s *statusTracer) memorySnapshot(ctx context.Context, stats runtime.MemStats) {
id := s.nextMemoryID
s.nextMemoryID++
processTotals := make(map[string]string)
processTotals["heap_in_use"] = fmt.Sprintf("%x", stats.Alloc)
processTotals["heap_virtual_memory"] = fmt.Sprintf("%x", stats.HeapSys)
processTotals["heap_releasable_memory"] = fmt.Sprintf("%x", stats.HeapIdle-stats.HeapReleased)
processTotals["gc_memory"] = fmt.Sprintf("%x", stats.GCSys)
dumps := make(map[string]interface{})
dumps["process_totals"] = processTotals
e := traceEvent{
Name: "periodic_interval",
EventType: eventMemoryDump,
Timestamp: time.Since(s.start).Nanoseconds() / 1000,
ProcessID: uint64(s.processID),
ID: fmt.Sprintf("mem%+v", id),
Args: map[string]interface{}{"dumps": dumps},
}
b, _ := json.Marshal(e)
s.writer.Write([]byte("\n"))
s.writer.Write(b)
s.writer.Write([]byte(","))
}