1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 |
|
8 |
|
9 |
|
10 |
|
11 |
|
12 |
|
13 |
|
14 |
|
15 |
|
16 | const {helper, assert} = require('./helper');
|
17 | const fs = require('fs');
|
18 |
|
19 | const openAsync = helper.promisify(fs.open);
|
20 | const writeAsync = helper.promisify(fs.write);
|
21 | const closeAsync = helper.promisify(fs.close);
|
22 |
|
23 | class Tracing {
|
24 | |
25 |
|
26 |
|
27 | constructor(client) {
|
28 | this._client = client;
|
29 | this._recording = false;
|
30 | this._path = '';
|
31 | }
|
32 |
|
33 | |
34 |
|
35 |
|
36 | start(options) {return (fn => {
|
37 | const gen = fn.call(this);
|
38 | return new Promise((resolve, reject) => {
|
39 | function step(key, arg) {
|
40 | let info, value;
|
41 | try {
|
42 | info = gen[key](arg);
|
43 | value = info.value;
|
44 | } catch (error) {
|
45 | reject(error);
|
46 | return;
|
47 | }
|
48 | if (info.done) {
|
49 | resolve(value);
|
50 | } else {
|
51 | return Promise.resolve(value).then(
|
52 | value => {
|
53 | step('next', value);
|
54 | },
|
55 | err => {
|
56 | step('throw', err);
|
57 | });
|
58 | }
|
59 | }
|
60 | return step('next');
|
61 | });
|
62 | })(function*(){
|
63 | assert(!this._recording, 'Cannot start recording trace while already recording trace.');
|
64 |
|
65 | const defaultCategories = [
|
66 | '-*', 'devtools.timeline', 'v8.execute', 'disabled-by-default-devtools.timeline',
|
67 | 'disabled-by-default-devtools.timeline.frame', 'toplevel',
|
68 | 'blink.console', 'blink.user_timing', 'latencyInfo', 'disabled-by-default-devtools.timeline.stack',
|
69 | 'disabled-by-default-v8.cpu_profiler', 'disabled-by-default-v8.cpu_profiler.hires'
|
70 | ];
|
71 | const categoriesArray = options.categories || defaultCategories;
|
72 |
|
73 | if (options.screenshots)
|
74 | categoriesArray.push('disabled-by-default-devtools.screenshot');
|
75 |
|
76 | this._path = options.path;
|
77 | this._recording = true;
|
78 | (yield this._client.send('Tracing.start', {
|
79 | transferMode: 'ReturnAsStream',
|
80 | categories: categoriesArray.join(',')
|
81 | }));
|
82 | });}
|
83 |
|
84 | stop() {return (fn => {
|
85 | const gen = fn.call(this);
|
86 | return new Promise((resolve, reject) => {
|
87 | function step(key, arg) {
|
88 | let info, value;
|
89 | try {
|
90 | info = gen[key](arg);
|
91 | value = info.value;
|
92 | } catch (error) {
|
93 | reject(error);
|
94 | return;
|
95 | }
|
96 | if (info.done) {
|
97 | resolve(value);
|
98 | } else {
|
99 | return Promise.resolve(value).then(
|
100 | value => {
|
101 | step('next', value);
|
102 | },
|
103 | err => {
|
104 | step('throw', err);
|
105 | });
|
106 | }
|
107 | }
|
108 | return step('next');
|
109 | });
|
110 | })(function*(){
|
111 | let fulfill;
|
112 | const contentPromise = new Promise(x => fulfill = x);
|
113 | this._client.once('Tracing.tracingComplete', event => {
|
114 | this._readStream(event.stream, this._path).then(fulfill);
|
115 | });
|
116 | (yield this._client.send('Tracing.end'));
|
117 | this._recording = false;
|
118 | return contentPromise;
|
119 | });}
|
120 |
|
121 | |
122 |
|
123 |
|
124 |
|
125 | _readStream(handle, path) {return (fn => {
|
126 | const gen = fn.call(this);
|
127 | return new Promise((resolve, reject) => {
|
128 | function step(key, arg) {
|
129 | let info, value;
|
130 | try {
|
131 | info = gen[key](arg);
|
132 | value = info.value;
|
133 | } catch (error) {
|
134 | reject(error);
|
135 | return;
|
136 | }
|
137 | if (info.done) {
|
138 | resolve(value);
|
139 | } else {
|
140 | return Promise.resolve(value).then(
|
141 | value => {
|
142 | step('next', value);
|
143 | },
|
144 | err => {
|
145 | step('throw', err);
|
146 | });
|
147 | }
|
148 | }
|
149 | return step('next');
|
150 | });
|
151 | })(function*(){
|
152 | let eof = false;
|
153 | let file;
|
154 | if (path)
|
155 | file = (yield openAsync(path, 'w'));
|
156 | const bufs = [];
|
157 | while (!eof) {
|
158 | const response = (yield this._client.send('IO.read', {handle}));
|
159 | eof = response.eof;
|
160 | bufs.push(Buffer.from(response.data));
|
161 | if (path)
|
162 | (yield writeAsync(file, response.data));
|
163 | }
|
164 | if (path)
|
165 | (yield closeAsync(file));
|
166 | (yield this._client.send('IO.close', {handle}));
|
167 | let resultBuffer = null;
|
168 | try {
|
169 | resultBuffer = Buffer.concat(bufs);
|
170 | } finally {
|
171 | return resultBuffer;
|
172 | }
|
173 | });}
|
174 | }
|
175 | helper.tracePublicAPI(Tracing);
|
176 |
|
177 | module.exports = Tracing;
|