1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
'use strict';
// This file contains process bootstrappers that can only be
// run in the worker thread.
const {
getEnvMessagePort,
threadId
} = internalBinding('worker');
const {
messageTypes,
kStdioWantsMoreDataCallback,
kWaitingStreams,
ReadableWorkerStdio,
WritableWorkerStdio
} = require('internal/worker/io');
let debuglog;
function debug(...args) {
if (!debuglog) {
debuglog = require('util').debuglog('worker');
}
return debuglog(...args);
}
const workerStdio = {};
function initializeWorkerStdio() {
const port = getEnvMessagePort();
port[kWaitingStreams] = 0;
workerStdio.stdin = new ReadableWorkerStdio(port, 'stdin');
workerStdio.stdout = new WritableWorkerStdio(port, 'stdout');
workerStdio.stderr = new WritableWorkerStdio(port, 'stderr');
return {
getStdout() { return workerStdio.stdout; },
getStderr() { return workerStdio.stderr; },
getStdin() { return workerStdio.stdin; }
};
}
function createMessageHandler(port) {
const publicWorker = require('worker_threads');
return function(message) {
if (message.type === messageTypes.LOAD_SCRIPT) {
const { filename, doEval, workerData, publicPort, hasStdin } = message;
publicWorker.parentPort = publicPort;
publicWorker.workerData = workerData;
if (!hasStdin)
workerStdio.stdin.push(null);
debug(`[${threadId}] starts worker script ${filename} ` +
`(eval = ${eval}) at cwd = ${process.cwd()}`);
port.unref();
port.postMessage({ type: messageTypes.UP_AND_RUNNING });
if (doEval) {
const { evalScript } = require('internal/process/execution');
evalScript('[worker eval]', filename);
} else {
process.argv[1] = filename; // script filename
require('module').runMain();
}
return;
} else if (message.type === messageTypes.STDIO_PAYLOAD) {
const { stream, chunk, encoding } = message;
workerStdio[stream].push(chunk, encoding);
return;
} else if (message.type === messageTypes.STDIO_WANTS_MORE_DATA) {
const { stream } = message;
workerStdio[stream][kStdioWantsMoreDataCallback]();
return;
}
require('assert').fail(`Unknown worker message type ${message.type}`);
};
}
// XXX(joyeecheung): this has to be returned as an anonymous function
// wrapped in a closure, see the comment of the original
// process._fatalException in lib/internal/process/execution.js
function createWorkerFatalExeception(port) {
const {
fatalException: originalFatalException
} = require('internal/process/execution');
return (error) => {
debug(`[${threadId}] gets fatal exception`);
let caught = false;
try {
caught = originalFatalException.call(this, error);
} catch (e) {
error = e;
}
debug(`[${threadId}] fatal exception caught = ${caught}`);
if (!caught) {
let serialized;
try {
const { serializeError } = require('internal/error-serdes');
serialized = serializeError(error);
} catch {}
debug(`[${threadId}] fatal exception serialized = ${!!serialized}`);
if (serialized)
port.postMessage({
type: messageTypes.ERROR_MESSAGE,
error: serialized
});
else
port.postMessage({ type: messageTypes.COULD_NOT_SERIALIZE_ERROR });
const { clearAsyncIdStack } = require('internal/async_hooks');
clearAsyncIdStack();
process.exit();
}
};
}
function setup() {
debug(`[${threadId}] is setting up worker child environment`);
const port = getEnvMessagePort();
port.on('message', createMessageHandler(port));
port.start();
return {
workerFatalExeception: createWorkerFatalExeception(port)
};
}
module.exports = {
initializeWorkerStdio,
setup
};
|
