1// Copyright 2018 Google Inc. All Rights Reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//   http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package metrics
16
17import (
18	"time"
19
20	"android/soong/ui/metrics/metrics_proto"
21	"android/soong/ui/tracer"
22	"github.com/golang/protobuf/proto"
23)
24
25// for testing purpose only
26var _now = now
27
28type timeEvent struct {
29	desc string
30	name string
31
32	// the time that the event started to occur.
33	start time.Time
34}
35
36type TimeTracer interface {
37	Begin(name, desc string, thread tracer.Thread)
38	End(thread tracer.Thread) soong_metrics_proto.PerfInfo
39}
40
41type timeTracerImpl struct {
42	activeEvents []timeEvent
43}
44
45var _ TimeTracer = &timeTracerImpl{}
46
47func now() time.Time {
48	return time.Now()
49}
50
51func (t *timeTracerImpl) Begin(name, desc string, _ tracer.Thread) {
52	t.activeEvents = append(t.activeEvents, timeEvent{name: name, desc: desc, start: _now()})
53}
54
55func (t *timeTracerImpl) End(tracer.Thread) soong_metrics_proto.PerfInfo {
56	if len(t.activeEvents) < 1 {
57		panic("Internal error: No pending events for endAt to end!")
58	}
59	lastEvent := t.activeEvents[len(t.activeEvents)-1]
60	t.activeEvents = t.activeEvents[:len(t.activeEvents)-1]
61	realTime := uint64(_now().Sub(lastEvent.start).Nanoseconds())
62
63	return soong_metrics_proto.PerfInfo{
64		Desc:      proto.String(lastEvent.desc),
65		Name:      proto.String(lastEvent.name),
66		StartTime: proto.Uint64(uint64(lastEvent.start.UnixNano())),
67		RealTime:  proto.Uint64(realTime),
68	}
69}
70