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async_hooks,doc: cache process.stdout.fd outside init #38382

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async_hooks,doc: cache process.stdout.fd outside init #38382

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12e25e2
async_hooks,doc: replace process.stdout.fd with 1
RaisinTen Apr 24, 2021
6a940bb
cache process.stdout.fd outside init
RaisinTen Apr 24, 2021
4d4106c
directly use modules
RaisinTen Apr 25, 2021
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20 changes: 15 additions & 5 deletions doc/api/async_hooks.md
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Expand Up @@ -271,11 +271,16 @@ created, while `triggerAsyncId` shows *why* a resource was created.
The following is a simple demonstration of `triggerAsyncId`:

```js
const async_hooks = require('async_hooks');
const fs = require('fs');
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const { fd } = process.stdout;

async_hooks.createHook({
init(asyncId, type, triggerAsyncId) {
const eid = async_hooks.executionAsyncId();
fs.writeSync(
process.stdout.fd,
fd,
`${type}(${asyncId}): trigger: ${triggerAsyncId} execution: ${eid}\n`);
}
}).enable();
Expand Down Expand Up @@ -322,29 +327,34 @@ callback to `listen()` will look like. The output formatting is slightly more
elaborate to make calling context easier to see.

```js
const async_hooks = require('async_hooks');
const fs = require('fs');

const { fd } = process.stdout;

let indent = 0;
async_hooks.createHook({
init(asyncId, type, triggerAsyncId) {
const eid = async_hooks.executionAsyncId();
const indentStr = ' '.repeat(indent);
fs.writeSync(
process.stdout.fd,
fd,
`${indentStr}${type}(${asyncId}):` +
` trigger: ${triggerAsyncId} execution: ${eid}\n`);
},
before(asyncId) {
const indentStr = ' '.repeat(indent);
fs.writeSync(process.stdout.fd, `${indentStr}before: ${asyncId}\n`);
fs.writeSync(fd, `${indentStr}before: ${asyncId}\n`);
indent += 2;
},
after(asyncId) {
indent -= 2;
const indentStr = ' '.repeat(indent);
fs.writeSync(process.stdout.fd, `${indentStr}after: ${asyncId}\n`);
fs.writeSync(fd, `${indentStr}after: ${asyncId}\n`);
},
destroy(asyncId) {
const indentStr = ' '.repeat(indent);
fs.writeSync(process.stdout.fd, `${indentStr}destroy: ${asyncId}\n`);
fs.writeSync(fd, `${indentStr}destroy: ${asyncId}\n`);
},
}).enable();

Expand Down