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stream: refactor writable _write
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PR-URL: nodejs#50198
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ronag committed Oct 17, 2023
1 parent f09a50c commit 6c72783
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Showing 2 changed files with 18 additions and 12 deletions.
28 changes: 17 additions & 11 deletions lib/internal/streams/writable.js
Original file line number Diff line number Diff line change
Expand Up @@ -443,21 +443,21 @@ Writable.prototype.pipe = function() {
function _write(stream, chunk, encoding, cb) {
const state = stream._writableState;

if (typeof encoding === 'function') {
cb = encoding;
encoding = (state[kState] & kDefaultUTF8Encoding) !== 0 ? 'utf8' : state.defaultEncoding;
} else {
if (!encoding)
encoding = (state[kState] & kDefaultUTF8Encoding) !== 0 ? 'utf8' : state.defaultEncoding;
else if (encoding !== 'buffer' && !Buffer.isEncoding(encoding))
throw new ERR_UNKNOWN_ENCODING(encoding);
if (typeof cb !== 'function')
cb = nop;
if (cb == null || typeof cb !== 'function') {
cb = nop;
}

if (chunk === null) {
throw new ERR_STREAM_NULL_VALUES();
} else if ((state[kState] & kObjectMode) === 0) {
}

if ((state[kState] & kObjectMode) === 0) {
if (!encoding) {
encoding = (state[kState] & kDefaultUTF8Encoding) !== 0 ? 'utf8' : state.defaultEncoding;
} else if (encoding !== 'buffer' && !Buffer.isEncoding(encoding)) {
throw new ERR_UNKNOWN_ENCODING(encoding);
}

if (typeof chunk === 'string') {
if ((state[kState] & kDecodeStrings) !== 0) {
chunk = Buffer.from(chunk, encoding);
Expand Down Expand Up @@ -486,11 +486,17 @@ function _write(stream, chunk, encoding, cb) {
errorOrDestroy(stream, err, true);
return err;
}

state.pendingcb++;
return writeOrBuffer(stream, state, chunk, encoding, cb);
}

Writable.prototype.write = function(chunk, encoding, cb) {
if (encoding != null && typeof encoding === 'function') {
cb = encoding;
encoding = null;
}

return _write(this, chunk, encoding, cb) === true;
};

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2 changes: 1 addition & 1 deletion test/parallel/test-stream-uint8array.js
Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ const GHI = new Uint8Array([0x47, 0x48, 0x49]);
assert(!(chunk instanceof Buffer));
assert(chunk instanceof Uint8Array);
assert.strictEqual(chunk, ABC);
assert.strictEqual(encoding, 'utf8');
assert.strictEqual(encoding, undefined);
cb();
})
});
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