mirror of
https://github.com/nodejs/node.git
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stream: construct
Provide a standardized way of asynchronously creating and initializing resources before performing any work. Refs: https://github.com/nodejs/node/issues/29314 PR-URL: https://github.com/nodejs/node/pull/29656 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Denys Otrishko <shishugi@gmail.com>
This commit is contained in:
Robert Nagy
parent
9949a2e1e3
commit
fb8cc72e73
@ -550,8 +550,7 @@ added: v9.3.0
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* {number}
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Return the value of `highWaterMark` passed when constructing this
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`Writable`.
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Return the value of `highWaterMark` passed when creating this `Writable`.
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##### `writable.writableLength`
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<!-- YAML
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@ -1193,8 +1192,7 @@ added: v9.3.0
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* {number}
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Returns the value of `highWaterMark` passed when constructing this
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`Readable`.
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Returns the value of `highWaterMark` passed when creating this `Readable`.
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##### `readable.readableLength`
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<!-- YAML
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@ -1792,7 +1790,7 @@ expectations.
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added: v1.2.0
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-->
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For many simple cases, it is possible to construct a stream without relying on
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For many simple cases, it is possible to create a stream without relying on
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inheritance. This can be accomplished by directly creating instances of the
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`stream.Writable`, `stream.Readable`, `stream.Duplex` or `stream.Transform`
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objects and passing appropriate methods as constructor options.
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@ -1801,8 +1799,14 @@ objects and passing appropriate methods as constructor options.
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const { Writable } = require('stream');
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const myWritable = new Writable({
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construct(callback) {
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// Initialize state and load resources...
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},
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write(chunk, encoding, callback) {
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// ...
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},
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destroy() {
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// Free resources...
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}
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});
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```
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@ -1861,6 +1865,8 @@ changes:
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[`stream._destroy()`][writable-_destroy] method.
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* `final` {Function} Implementation for the
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[`stream._final()`][stream-_final] method.
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* `construct` {Function} Implementation for the
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[`stream._construct()`][writable-_construct] method.
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* `autoDestroy` {boolean} Whether this stream should automatically call
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`.destroy()` on itself after ending. **Default:** `true`.
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@ -1906,6 +1912,56 @@ const myWritable = new Writable({
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});
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```
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#### `writable._construct(callback)`
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<!-- YAML
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added: REPLACEME
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-->
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* `callback` {Function} Call this function (optionally with an error
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argument) when the stream has finished initializing.
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The `_construct()` method MUST NOT be called directly. It may be implemented
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by child classes, and if so, will be called by the internal `Writable`
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class methods only.
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This optional function will be called in a tick after the stream constructor
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has returned, delaying any `_write`, `_final` and `_destroy` calls until
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`callback` is called. This is useful to initialize state or asynchronously
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initialize resources before the stream can be used.
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```js
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const { Writable } = require('stream');
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const fs = require('fs');
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class WriteStream extends Writable {
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constructor(filename) {
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super();
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this.filename = filename;
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this.fd = fd;
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}
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_construct(callback) {
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fs.open(this.filename, (fd, err) => {
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if (err) {
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callback(err);
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} else {
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this.fd = fd;
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callback();
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}
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});
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}
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_write(chunk, encoding, callback) {
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fs.write(this.fd, chunk, callback);
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}
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_destroy(err, callback) {
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if (this.fd) {
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fs.close(this.fd, (er) => callback(er || err));
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} else {
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callback(err);
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}
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}
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}
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```
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#### `writable._write(chunk, encoding, callback)`
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<!-- YAML
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changes:
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@ -2130,6 +2186,8 @@ changes:
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method.
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* `destroy` {Function} Implementation for the
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[`stream._destroy()`][readable-_destroy] method.
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* `construct` {Function} Implementation for the
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[`stream._construct()`][readable-_construct] method.
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* `autoDestroy` {boolean} Whether this stream should automatically call
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`.destroy()` on itself after ending. **Default:** `true`.
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@ -2172,6 +2230,63 @@ const myReadable = new Readable({
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});
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```
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#### `readable._construct(callback)`
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<!-- YAML
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added: REPLACEME
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-->
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* `callback` {Function} Call this function (optionally with an error
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argument) when the stream has finished initializing.
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The `_construct()` method MUST NOT be called directly. It may be implemented
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by child classes, and if so, will be called by the internal `Readable`
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class methods only.
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This optional function will be called by the stream constructor,
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delaying any `_read` and `_destroy` calls until `callback` is called. This is
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useful to initialize state or asynchronously initialize resources before the
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stream can be used.
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```js
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const { Readable } = require('stream');
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const fs = require('fs');
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class ReadStream extends Readable {
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constructor(filename) {
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super();
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this.filename = filename;
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this.fd = null;
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}
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_construct(callback) {
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fs.open(this.filename, (fd, err) => {
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if (err) {
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callback(err);
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} else {
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this.fd = fd;
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callback();
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}
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});
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}
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_read(n) {
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const buf = Buffer.alloc(n);
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fs.read(this.fd, buf, 0, n, null, (err, bytesRead) => {
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if (err) {
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this.destroy(err);
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} else {
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this.push(bytesRead > 0 ? buf.slice(0, bytesRead) : null);
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}
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});
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}
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_destroy(err, callback) {
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if (this.fd) {
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fs.close(this.fd, (er) => callback(er || err));
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} else {
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callback(err);
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}
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}
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}
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```
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#### `readable._read(size)`
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<!-- YAML
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added: v0.9.4
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@ -2427,6 +2542,46 @@ const myDuplex = new Duplex({
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});
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```
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When using pipeline:
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```js
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const { Transform, pipeline } = require('stream');
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const fs = require('fs');
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pipeline(
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fs.createReadStream('object.json')
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.setEncoding('utf-8'),
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new Transform({
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decodeStrings: false, // Accept string input rather than Buffers
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construct(callback) {
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this.data = '';
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callback();
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},
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transform(chunk, encoding, callback) {
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this.data += chunk;
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callback();
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},
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flush(callback) {
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try {
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// Make sure is valid json.
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JSON.parse(this.data);
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this.push(this.data);
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} catch (err) {
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callback(err);
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}
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}
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}),
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fs.createWriteStream('valid-object.json'),
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(err) => {
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if (err) {
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console.error('failed', err);
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} else {
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console.log('completed');
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}
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}
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);
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```
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#### An Example Duplex Stream
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The following illustrates a simple example of a `Duplex` stream that wraps a
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@ -2706,8 +2861,8 @@ unhandled post-destroy errors.
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#### Creating Readable Streams with Async Generators
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We can construct a Node.js Readable Stream from an asynchronous generator
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using the `Readable.from()` utility method:
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A Node.js Readable Stream can be created from an asynchronous generator using
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the `Readable.from()` utility method:
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```js
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const { Readable } = require('stream');
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@ -2960,6 +3115,7 @@ contain multi-byte characters.
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[http-incoming-message]: http.html#http_class_http_incomingmessage
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[hwm-gotcha]: #stream_highwatermark_discrepancy_after_calling_readable_setencoding
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[object-mode]: #stream_object_mode
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[readable-_construct]: #stream_readable_construct_callback
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[readable-_destroy]: #stream_readable_destroy_err_callback
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[readable-destroy]: #stream_readable_destroy_error
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[stream-_final]: #stream_writable_final_callback
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@ -2976,6 +3132,7 @@ contain multi-byte characters.
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[stream-uncork]: #stream_writable_uncork
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[stream-write]: #stream_writable_write_chunk_encoding_callback
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[Stream Three States]: #stream_three_states
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[writable-_construct]: #stream_writable_construct_callback
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[writable-_destroy]: #stream_writable_destroy_err_callback
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[writable-destroy]: #stream_writable_destroy_error
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[writable-new]: #stream_constructor_new_stream_writable_options
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@ -118,6 +118,12 @@ function ReadableState(options, stream, isDuplex) {
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this.endEmitted = false;
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this.reading = false;
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// Stream is still being constructed and cannot be
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// destroyed until construction finished or failed.
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// Async construction is opt in, therefore we start as
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// constructed.
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this.constructed = true;
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// A flag to be able to tell if the event 'readable'/'data' is emitted
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// immediately, or on a later tick. We set this to true at first, because
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// any actions that shouldn't happen until "later" should generally also
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@ -197,9 +203,16 @@ function Readable(options) {
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if (typeof options.destroy === 'function')
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this._destroy = options.destroy;
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if (typeof options.construct === 'function')
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this._construct = options.construct;
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}
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Stream.call(this, options);
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destroyImpl.construct(this, () => {
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maybeReadMore(this, this._readableState);
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});
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}
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Readable.prototype.destroy = destroyImpl.destroy;
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@ -461,11 +474,12 @@ Readable.prototype.read = function(n) {
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}
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// However, if we've ended, then there's no point, if we're already
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// reading, then it's unnecessary, and if we're destroyed or errored,
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// then it's not allowed.
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if (state.ended || state.reading || state.destroyed || state.errored) {
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// reading, then it's unnecessary, if we're constructing we have to wait,
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// and if we're destroyed or errored, then it's not allowed,
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if (state.ended || state.reading || state.destroyed || state.errored ||
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!state.constructed) {
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doRead = false;
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debug('reading or ended', doRead);
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debug('reading, ended or constructing', doRead);
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} else if (doRead) {
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debug('do read');
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state.reading = true;
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@ -587,7 +601,7 @@ function emitReadable_(stream) {
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// However, if we're not ended, or reading, and the length < hwm,
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// then go ahead and try to read some more preemptively.
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function maybeReadMore(stream, state) {
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if (!state.readingMore) {
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if (!state.readingMore && state.constructed) {
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state.readingMore = true;
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process.nextTick(maybeReadMore_, stream, state);
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}
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@ -155,6 +155,12 @@ function WritableState(options, stream, isDuplex) {
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// this must be 0 before 'finish' can be emitted.
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this.pendingcb = 0;
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// Stream is still being constructed and cannot be
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// destroyed until construction finished or failed.
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// Async construction is opt in, therefore we start as
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// constructed.
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this.constructed = true;
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// Emit prefinish if the only thing we're waiting for is _write cbs
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// This is relevant for synchronous Transform streams.
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this.prefinished = false;
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@ -249,9 +255,22 @@ function Writable(options) {
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if (typeof options.final === 'function')
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this._final = options.final;
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if (typeof options.construct === 'function')
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this._construct = options.construct;
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}
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Stream.call(this, options);
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destroyImpl.construct(this, () => {
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const state = this._writableState;
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if (!state.writing) {
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clearBuffer(this, state);
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}
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finishMaybe(this, state);
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});
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}
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// Otherwise people can pipe Writable streams, which is just wrong.
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@ -342,7 +361,7 @@ function writeOrBuffer(stream, state, chunk, encoding, callback) {
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state.length += len;
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if (state.writing || state.corked || state.errored) {
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if (state.writing || state.corked || state.errored || !state.constructed) {
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state.buffered.push({ chunk, encoding, callback });
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if (state.allBuffers && encoding !== 'buffer') {
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state.allBuffers = false;
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@ -492,7 +511,10 @@ function errorBuffer(state, err) {
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// If there's something in the buffer waiting, then process it.
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function clearBuffer(stream, state) {
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if (state.corked || state.bufferProcessing || state.destroyed) {
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if (state.corked ||
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state.bufferProcessing ||
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state.destroyed ||
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!state.constructed) {
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return;
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}
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@ -600,6 +622,7 @@ Writable.prototype.end = function(chunk, encoding, cb) {
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function needFinish(state) {
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return (state.ending &&
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state.constructed &&
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state.length === 0 &&
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!state.errored &&
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state.buffered.length === 0 &&
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@ -1,10 +1,20 @@
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'use strict';
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const {
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ERR_MULTIPLE_CALLBACK
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} = require('internal/errors').codes;
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const { Symbol } = primordials;
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const kDestroy = Symbol('kDestroy');
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const kConstruct = Symbol('kConstruct');
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// Backwards compat. cb() is undocumented and unused in core but
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// unfortunately might be used by modules.
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function destroy(err, cb) {
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const r = this._readableState;
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const w = this._writableState;
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// With duplex streams we use the writable side for state.
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const s = w || r;
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if ((w && w.destroyed) || (r && r.destroyed)) {
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if (typeof cb === 'function') {
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@ -33,7 +43,23 @@ function destroy(err, cb) {
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r.destroyed = true;
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}
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this._destroy(err || null, (err) => {
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// If still constructing then defer calling _destroy.
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if (!s.constructed) {
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this.once(kDestroy, function(er) {
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_destroy(this, err || er, cb);
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});
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} else {
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_destroy(this, err, cb);
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}
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return this;
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}
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function _destroy(self, err, cb) {
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self._destroy(err || null, (err) => {
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const r = self._readableState;
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const w = self._writableState;
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if (err) {
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if (w) {
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w.errored = true;
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@ -55,13 +81,11 @@ function destroy(err, cb) {
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}
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if (err) {
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process.nextTick(emitErrorCloseNT, this, err);
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process.nextTick(emitErrorCloseNT, self, err);
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} else {
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process.nextTick(emitCloseNT, this);
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process.nextTick(emitCloseNT, self);
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}
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});
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return this;
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}
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function emitErrorCloseNT(self, err) {
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@ -108,6 +132,7 @@ function undestroy() {
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const w = this._writableState;
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if (r) {
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r.constructed = true;
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r.closed = false;
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r.closeEmitted = false;
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r.destroyed = false;
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@ -119,6 +144,7 @@ function undestroy() {
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}
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if (w) {
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w.constructed = true;
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w.destroyed = false;
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w.closed = false;
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w.closeEmitted = false;
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@ -155,7 +181,6 @@ function errorOrDestroy(stream, err, sync) {
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if (r) {
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r.errored = true;
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}
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if (sync) {
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process.nextTick(emitErrorNT, stream, err);
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} else {
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@ -164,6 +189,66 @@ function errorOrDestroy(stream, err, sync) {
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}
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}
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function construct(stream, cb) {
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if (typeof stream._construct !== 'function') {
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return;
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}
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stream.once(kConstruct, cb);
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if (stream.listenerCount(kConstruct) > 1) {
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// Duplex
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return;
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}
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const r = stream._readableState;
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const w = stream._writableState;
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if (r) {
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r.constructed = false;
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}
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if (w) {
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w.constructed = false;
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}
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process.nextTick(constructNT, stream);
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}
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function constructNT(stream) {
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const r = stream._readableState;
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const w = stream._writableState;
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// With duplex streams we use the writable side for state.
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const s = w || r;
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let called = false;
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stream._construct((err) => {
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if (r) {
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||||
r.constructed = true;
|
||||
}
|
||||
if (w) {
|
||||
w.constructed = true;
|
||||
}
|
||||
|
||||
if (called) {
|
||||
err = new ERR_MULTIPLE_CALLBACK();
|
||||
} else {
|
||||
called = true;
|
||||
}
|
||||
|
||||
if (s.destroyed) {
|
||||
stream.emit(kDestroy, err);
|
||||
} else if (err) {
|
||||
errorOrDestroy(stream, err, true);
|
||||
} else {
|
||||
process.nextTick(emitConstructNT, stream);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
function emitConstructNT(stream) {
|
||||
stream.emit(kConstruct);
|
||||
}
|
||||
|
||||
function isRequest(stream) {
|
||||
return stream && stream.setHeader && typeof stream.abort === 'function';
|
||||
}
|
||||
@ -177,6 +262,7 @@ function destroyer(stream, err) {
|
||||
}
|
||||
|
||||
module.exports = {
|
||||
construct,
|
||||
destroyer,
|
||||
destroy,
|
||||
undestroy,
|
||||
|
||||
244
test/parallel/test-stream-construct.js
Normal file
244
test/parallel/test-stream-construct.js
Normal file
@ -0,0 +1,244 @@
|
||||
'use strict';
|
||||
|
||||
const common = require('../common');
|
||||
const { Writable, Readable, Duplex } = require('stream');
|
||||
const assert = require('assert');
|
||||
|
||||
{
|
||||
// Multiple callback.
|
||||
new Writable({
|
||||
construct: common.mustCall((callback) => {
|
||||
callback();
|
||||
callback();
|
||||
})
|
||||
}).on('error', common.expectsError({
|
||||
name: 'Error',
|
||||
code: 'ERR_MULTIPLE_CALLBACK'
|
||||
}));
|
||||
}
|
||||
|
||||
{
|
||||
// Multiple callback.
|
||||
new Readable({
|
||||
construct: common.mustCall((callback) => {
|
||||
callback();
|
||||
callback();
|
||||
})
|
||||
}).on('error', common.expectsError({
|
||||
name: 'Error',
|
||||
code: 'ERR_MULTIPLE_CALLBACK'
|
||||
}));
|
||||
}
|
||||
|
||||
{
|
||||
// Synchronous error.
|
||||
|
||||
new Writable({
|
||||
construct: common.mustCall((callback) => {
|
||||
callback(new Error('test'));
|
||||
})
|
||||
}).on('error', common.expectsError({
|
||||
name: 'Error',
|
||||
message: 'test'
|
||||
}));
|
||||
}
|
||||
|
||||
{
|
||||
// Synchronous error.
|
||||
|
||||
new Readable({
|
||||
construct: common.mustCall((callback) => {
|
||||
callback(new Error('test'));
|
||||
})
|
||||
}).on('error', common.expectsError({
|
||||
name: 'Error',
|
||||
message: 'test'
|
||||
}));
|
||||
}
|
||||
|
||||
{
|
||||
// Asynchronous error.
|
||||
|
||||
new Writable({
|
||||
construct: common.mustCall((callback) => {
|
||||
process.nextTick(callback, new Error('test'));
|
||||
})
|
||||
}).on('error', common.expectsError({
|
||||
name: 'Error',
|
||||
message: 'test'
|
||||
}));
|
||||
}
|
||||
|
||||
{
|
||||
// Asynchronous error.
|
||||
|
||||
new Readable({
|
||||
construct: common.mustCall((callback) => {
|
||||
process.nextTick(callback, new Error('test'));
|
||||
})
|
||||
}).on('error', common.expectsError({
|
||||
name: 'Error',
|
||||
message: 'test'
|
||||
}));
|
||||
}
|
||||
|
||||
function testDestroy(factory) {
|
||||
{
|
||||
let constructed = false;
|
||||
const s = factory({
|
||||
construct: common.mustCall((cb) => {
|
||||
constructed = true;
|
||||
process.nextTick(cb);
|
||||
})
|
||||
});
|
||||
s.on('close', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
s.destroy();
|
||||
}
|
||||
|
||||
{
|
||||
let constructed = false;
|
||||
const s = factory({
|
||||
construct: common.mustCall((cb) => {
|
||||
constructed = true;
|
||||
process.nextTick(cb);
|
||||
})
|
||||
});
|
||||
s.on('close', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
s.destroy(null, () => {
|
||||
assert.strictEqual(constructed, true);
|
||||
});
|
||||
}
|
||||
|
||||
{
|
||||
let constructed = false;
|
||||
const s = factory({
|
||||
construct: common.mustCall((cb) => {
|
||||
constructed = true;
|
||||
process.nextTick(cb);
|
||||
})
|
||||
});
|
||||
s.on('close', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
s.destroy();
|
||||
}
|
||||
|
||||
|
||||
{
|
||||
let constructed = false;
|
||||
const s = factory({
|
||||
construct: common.mustCall((cb) => {
|
||||
constructed = true;
|
||||
process.nextTick(cb);
|
||||
})
|
||||
});
|
||||
s.on('close', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
s.on('error', common.mustCall((err) => {
|
||||
assert.strictEqual(err.message, 'kaboom');
|
||||
}));
|
||||
s.destroy(new Error('kaboom'), (err) => {
|
||||
assert.strictEqual(err.message, 'kaboom');
|
||||
assert.strictEqual(constructed, true);
|
||||
});
|
||||
}
|
||||
|
||||
{
|
||||
let constructed = false;
|
||||
const s = factory({
|
||||
construct: common.mustCall((cb) => {
|
||||
constructed = true;
|
||||
process.nextTick(cb);
|
||||
})
|
||||
});
|
||||
s.on('error', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
s.on('close', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
s.destroy(new Error());
|
||||
}
|
||||
}
|
||||
testDestroy((opts) => new Readable({
|
||||
read: common.mustNotCall(),
|
||||
...opts
|
||||
}));
|
||||
testDestroy((opts) => new Writable({
|
||||
write: common.mustNotCall(),
|
||||
final: common.mustNotCall(),
|
||||
...opts
|
||||
}));
|
||||
|
||||
{
|
||||
let constructed = false;
|
||||
const r = new Readable({
|
||||
autoDestroy: true,
|
||||
construct: common.mustCall((cb) => {
|
||||
constructed = true;
|
||||
process.nextTick(cb);
|
||||
}),
|
||||
read: common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
r.push(null);
|
||||
})
|
||||
});
|
||||
r.on('close', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
r.on('data', common.mustNotCall());
|
||||
}
|
||||
|
||||
{
|
||||
let constructed = false;
|
||||
const w = new Writable({
|
||||
autoDestroy: true,
|
||||
construct: common.mustCall((cb) => {
|
||||
constructed = true;
|
||||
process.nextTick(cb);
|
||||
}),
|
||||
write: common.mustCall((chunk, encoding, cb) => {
|
||||
assert.strictEqual(constructed, true);
|
||||
process.nextTick(cb);
|
||||
}),
|
||||
final: common.mustCall((cb) => {
|
||||
assert.strictEqual(constructed, true);
|
||||
process.nextTick(cb);
|
||||
})
|
||||
});
|
||||
w.on('close', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
w.end('data');
|
||||
}
|
||||
|
||||
{
|
||||
let constructed = false;
|
||||
const w = new Writable({
|
||||
autoDestroy: true,
|
||||
construct: common.mustCall((cb) => {
|
||||
constructed = true;
|
||||
process.nextTick(cb);
|
||||
}),
|
||||
write: common.mustNotCall(),
|
||||
final: common.mustCall((cb) => {
|
||||
assert.strictEqual(constructed, true);
|
||||
process.nextTick(cb);
|
||||
})
|
||||
});
|
||||
w.on('close', common.mustCall(() => {
|
||||
assert.strictEqual(constructed, true);
|
||||
}));
|
||||
w.end();
|
||||
}
|
||||
|
||||
{
|
||||
new Duplex({
|
||||
construct: common.mustCall()
|
||||
});
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user