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GeezerVison is showing github.com — diagnostics_channel: capture console messages · nodejs/node@c9a211a

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  • doc/api
    • diagnostics_channel.md
  • lib/internal/console
    • constructor.js
  • test/parallel
    • test-console-diagnostics-channels.js
    • test-repl.js
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‎doc/api/diagnostics_channel.md‎

Copy file name to clipboardExpand all lines: doc/api/diagnostics_channel.md
+37Lines changed: 37 additions & 0 deletions
  • Display the source diff
  • Display the rich diff
Original file line numberDiff line numberDiff line change
@@ -1121,6 +1121,43 @@ While the diagnostics\_channel API is now considered stable, the built-in
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channels currently available are not. Each channel must be declared stable
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independently.
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#### Console
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`console.log`
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* `args` {any\[]}
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Emitted when `console.log()` is called. Receives and array of the arguments
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passed to `console.log()`.
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`console.info`
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* `args` {any\[]}
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Emitted when `console.info()` is called. Receives and array of the arguments
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passed to `console.info()`.
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`console.debug`
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* `args` {any\[]}
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Emitted when `console.debug()` is called. Receives and array of the arguments
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passed to `console.debug()`.
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`console.warn`
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* `args` {any\[]}
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Emitted when `console.warn()` is called. Receives and array of the arguments
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passed to `console.warn()`.
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`console.error`
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* `args` {any\[]}
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Emitted when `console.error()` is called. Receives and array of the arguments
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passed to `console.error()`.
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11241161
#### HTTP
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`http.client.request.created`
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‎lib/internal/console/constructor.js‎

Copy file name to clipboardExpand all lines: lib/internal/console/constructor.js
+32-3Lines changed: 32 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -61,6 +61,13 @@ const {
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} = require('internal/constants');
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const kCounts = Symbol('counts');
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const { time, timeLog, timeEnd, kNone } = require('internal/util/debuglog');
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const { channel } = require('diagnostics_channel');
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const onLog = channel('console.log');
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const onWarn = channel('console.warn');
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const onError = channel('console.error');
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const onInfo = channel('console.info');
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const onDebug = channel('console.debug');
6471

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const kTraceConsoleCategory = 'node,node.console';
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@@ -371,14 +378,39 @@ function timeLogImpl(consoleRef, label, formatted, args) {
371378

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const consoleMethods = {
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log(...args) {
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if (onLog.hasSubscribers) {
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onLog.publish(args);
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}
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this[kWriteToConsole](kUseStdout, this[kFormatForStdout](args));
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},
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387+
info(...args) {
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if (onInfo.hasSubscribers) {
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onInfo.publish(args);
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}
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this[kWriteToConsole](kUseStdout, this[kFormatForStdout](args));
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},
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debug(...args) {
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if (onDebug.hasSubscribers) {
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onDebug.publish(args);
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}
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this[kWriteToConsole](kUseStdout, this[kFormatForStdout](args));
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},
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warn(...args) {
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if (onWarn.hasSubscribers) {
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onWarn.publish(args);
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}
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this[kWriteToConsole](kUseStderr, this[kFormatForStderr](args));
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},
381407

408+
error(...args) {
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if (onError.hasSubscribers) {
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onError.publish(args);
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}
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this[kWriteToConsole](kUseStderr, this[kFormatForStderr](args));
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},
382414

383415
dir(object, options) {
384416
this[kWriteToConsole](kUseStdout, inspect(object, {
@@ -614,10 +646,7 @@ function noop() {}
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for (const method of ReflectOwnKeys(consoleMethods))
615647
Console.prototype[method] = consoleMethods[method];
616648

617-
Console.prototype.debug = Console.prototype.log;
618-
Console.prototype.info = Console.prototype.log;
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Console.prototype.dirxml = Console.prototype.log;
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Console.prototype.error = Console.prototype.warn;
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Console.prototype.groupCollapsed = Console.prototype.group;
622651

623652
function initializeGlobalConsole(globalConsole) {
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‎test/parallel/test-console-diagnostics-channels.js‎

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+77Lines changed: 77 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,77 @@
1+
'use strict';
2+
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const { mustCall } = require('../common');
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const { deepStrictEqual, ok, strictEqual } = require('assert');
5+
6+
const { channel } = require('diagnostics_channel');
7+
8+
const {
9+
hijackStdout,
10+
hijackStderr,
11+
restoreStdout,
12+
restoreStderr
13+
} = require('../common/hijackstdio');
14+
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const stdoutMethods = [
16+
'log',
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'info',
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'debug',
19+
];
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const stderrMethods = [
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'warn',
23+
'error',
24+
];
25+
26+
const methods = [
27+
...stdoutMethods,
28+
...stderrMethods,
29+
];
30+
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const channels = {
32+
log: channel('console.log'),
33+
info: channel('console.info'),
34+
debug: channel('console.debug'),
35+
warn: channel('console.warn'),
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error: channel('console.error')
37+
};
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process.stdout.isTTY = false;
40+
process.stderr.isTTY = false;
41+
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for (const method of methods) {
43+
let intercepted = false;
44+
let formatted = false;
45+
46+
const isStdout = stdoutMethods.includes(method);
47+
const hijack = isStdout ? hijackStdout : hijackStderr;
48+
const restore = isStdout ? restoreStdout : restoreStderr;
49+
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const foo = 'string';
51+
const bar = { key: /value/ };
52+
const baz = [ 1, 2, 3 ];
53+
54+
channels[method].subscribe(mustCall((args) => {
55+
// Should not have been formatted yet.
56+
intercepted = true;
57+
ok(!formatted);
58+
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// Should receive expected log message args.
60+
deepStrictEqual(args, [foo, bar, baz]);
61+
62+
// Should be able to mutate message args and have it reflected in output.
63+
bar.added = true;
64+
}));
65+
66+
hijack(mustCall((output) => {
67+
// Should have already been intercepted.
68+
formatted = true;
69+
ok(intercepted);
70+
71+
// Should produce expected formatted output with mutated message args.
72+
strictEqual(output, 'string { key: /value/, added: true } [ 1, 2, 3 ]\n');
73+
}));
74+
75+
console[method](foo, bar, baz);
76+
restore();
77+
}
Collapse file

‎test/parallel/test-repl.js‎

Copy file name to clipboardExpand all lines: test/parallel/test-repl.js
+3-3Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -794,7 +794,10 @@ const errorTests = [
794794
expect: [
795795
'Object [console] {',
796796
' log: [Function: log],',
797+
' info: [Function: info],',
798+
' debug: [Function: debug],',
797799
' warn: [Function: warn],',
800+
' error: [Function: error],',
798801
' dir: [Function: dir],',
799802
' time: [Function: time],',
800803
' timeEnd: [Function: timeEnd],',
@@ -807,10 +810,7 @@ const errorTests = [
807810
' group: [Function: group],',
808811
' groupEnd: [Function: groupEnd],',
809812
' table: [Function: table],',
810-
/ {2}debug: \[Function: (debug|log)],/,
811-
/ {2}info: \[Function: (info|log)],/,
812813
/ {2}dirxml: \[Function: (dirxml|log)],/,
813-
/ {2}error: \[Function: (error|warn)],/,
814814
/ {2}groupCollapsed: \[Function: (groupCollapsed|group)],/,
815815
/ {2}Console: \[Function: Console],?/,
816816
...process.features.inspector ? [

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