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'use strict';
require('../common');
const W = require('_stream_writable');
const D = require('_stream_duplex');
const assert = require('assert');
const util = require('util');
util.inherits(TestWriter, W);
function TestWriter() {
W.apply(this, arguments);
this.buffer = [];
this.written = 0;
}
TestWriter.prototype._write = function(chunk, encoding, cb) {
// simulate a small unpredictable latency
setTimeout(function() {
this.buffer.push(chunk.toString());
this.written += chunk.length;
cb();
}.bind(this), Math.floor(Math.random() * 10));
};
const chunks = new Array(50);
for (let i = 0; i < chunks.length; i++) {
chunks[i] = 'x'.repeat(i);
}
// tiny node-tap lookalike.
const tests = [];
let count = 0;
function test(name, fn) {
count++;
tests.push([name, fn]);
}
function run() {
const next = tests.shift();
if (!next)
return console.error('ok');
const name = next[0];
const fn = next[1];
console.log('# %s', name);
fn({
same: assert.deepStrictEqual,
equal: assert.strictEqual,
end: function() {
count--;
run();
}
});
}
// ensure all tests have run
process.on('exit', function() {
assert.strictEqual(count, 0);
});
process.nextTick(run);
test('write fast', function(t) {
const tw = new TestWriter({
highWaterMark: 100
});
tw.on('finish', function() {
t.same(tw.buffer, chunks, 'got chunks in the right order');
t.end();
});
chunks.forEach(function(chunk) {
// screw backpressure. Just buffer it all up.
tw.write(chunk);
});
tw.end();
});
test('write slow', function(t) {
const tw = new TestWriter({
highWaterMark: 100
});
tw.on('finish', function() {
t.same(tw.buffer, chunks, 'got chunks in the right order');
t.end();
});
let i = 0;
(function W() {
tw.write(chunks[i++]);
if (i < chunks.length)
setTimeout(W, 10);
else
tw.end();
})();
});
test('write backpressure', function(t) {
const tw = new TestWriter({
highWaterMark: 50
});
let drains = 0;
tw.on('finish', function() {
t.same(tw.buffer, chunks, 'got chunks in the right order');
t.equal(drains, 17);
t.end();
});
tw.on('drain', function() {
drains++;
});
let i = 0;
(function W() {
let ret;
do {
ret = tw.write(chunks[i++]);
} while (ret !== false && i < chunks.length);
if (i < chunks.length) {
assert(tw._writableState.length >= 50);
tw.once('drain', W);
} else {
tw.end();
}
})();
});
test('write bufferize', function(t) {
const tw = new TestWriter({
highWaterMark: 100
});
const encodings =
[ 'hex',
'utf8',
'utf-8',
'ascii',
'latin1',
'binary',
'base64',
'ucs2',
'ucs-2',
'utf16le',
'utf-16le',
undefined ];
tw.on('finish', function() {
t.same(tw.buffer, chunks, 'got the expected chunks');
});
chunks.forEach(function(chunk, i) {
const enc = encodings[i % encodings.length];
chunk = Buffer.from(chunk);
tw.write(chunk.toString(enc), enc);
});
t.end();
});
test('write no bufferize', function(t) {
const tw = new TestWriter({
highWaterMark: 100,
decodeStrings: false
});
tw._write = function(chunk, encoding, cb) {
assert.strictEqual(typeof chunk, 'string');
chunk = Buffer.from(chunk, encoding);
return TestWriter.prototype._write.call(this, chunk, encoding, cb);
};
const encodings =
[ 'hex',
'utf8',
'utf-8',
'ascii',
'latin1',
'binary',
'base64',
'ucs2',
'ucs-2',
'utf16le',
'utf-16le',
undefined ];
tw.on('finish', function() {
t.same(tw.buffer, chunks, 'got the expected chunks');
});
chunks.forEach(function(chunk, i) {
const enc = encodings[i % encodings.length];
chunk = Buffer.from(chunk);
tw.write(chunk.toString(enc), enc);
});
t.end();
});
test('write callbacks', function(t) {
const callbacks = chunks.map(function(chunk, i) {
return [i, function() {
callbacks._called[i] = chunk;
}];
}).reduce(function(set, x) {
set['callback-' + x[0]] = x[1];
return set;
}, {});
callbacks._called = [];
const tw = new TestWriter({
highWaterMark: 100
});
tw.on('finish', function() {
process.nextTick(function() {
t.same(tw.buffer, chunks, 'got chunks in the right order');
t.same(callbacks._called, chunks, 'called all callbacks');
t.end();
});
});
chunks.forEach(function(chunk, i) {
tw.write(chunk, callbacks['callback-' + i]);
});
tw.end();
});
test('end callback', function(t) {
const tw = new TestWriter();
tw.end(function() {
t.end();
});
});
test('end callback with chunk', function(t) {
const tw = new TestWriter();
tw.end(Buffer.from('hello world'), function() {
t.end();
});
});
test('end callback with chunk and encoding', function(t) {
const tw = new TestWriter();
tw.end('hello world', 'ascii', function() {
t.end();
});
});
test('end callback after .write() call', function(t) {
const tw = new TestWriter();
tw.write(Buffer.from('hello world'));
tw.end(function() {
t.end();
});
});
test('end callback called after write callback', function(t) {
const tw = new TestWriter();
let writeCalledback = false;
tw.write(Buffer.from('hello world'), function() {
writeCalledback = true;
});
tw.end(function() {
t.equal(writeCalledback, true);
t.end();
});
});
test('encoding should be ignored for buffers', function(t) {
const tw = new W();
const hex = '018b5e9a8f6236ffe30e31baf80d2cf6eb';
tw._write = function(chunk) {
t.equal(chunk.toString('hex'), hex);
t.end();
};
const buf = Buffer.from(hex, 'hex');
tw.write(buf, 'latin1');
});
test('writables are not pipable', function(t) {
const w = new W();
w._write = function() {};
let gotError = false;
w.on('error', function() {
gotError = true;
});
w.pipe(process.stdout);
assert(gotError);
t.end();
});
test('duplexes are pipable', function(t) {
const d = new D();
d._read = function() {};
d._write = function() {};
let gotError = false;
d.on('error', function() {
gotError = true;
});
d.pipe(process.stdout);
assert(!gotError);
t.end();
});
test('end(chunk) two times is an error', function(t) {
const w = new W();
w._write = function() {};
let gotError = false;
w.on('error', function(er) {
gotError = true;
t.equal(er.message, 'write after end');
});
w.end('this is the end');
w.end('and so is this');
process.nextTick(function() {
assert(gotError);
t.end();
});
});
test('dont end while writing', function(t) {
const w = new W();
let wrote = false;
w._write = function(chunk, e, cb) {
assert(!this.writing);
wrote = true;
this.writing = true;
setTimeout(function() {
this.writing = false;
cb();
}, 1);
};
w.on('finish', function() {
assert(wrote);
t.end();
});
w.write(Buffer.alloc(0));
w.end();
});
test('finish does not come before write cb', function(t) {
const w = new W();
let writeCb = false;
w._write = function(chunk, e, cb) {
setTimeout(function() {
writeCb = true;
cb();
}, 10);
};
w.on('finish', function() {
assert(writeCb);
t.end();
});
w.write(Buffer.alloc(0));
w.end();
});
test('finish does not come before sync _write cb', function(t) {
const w = new W();
let writeCb = false;
w._write = function(chunk, e, cb) {
cb();
};
w.on('finish', function() {
assert(writeCb);
t.end();
});
w.write(Buffer.alloc(0), function() {
writeCb = true;
});
w.end();
});
test('finish is emitted if last chunk is empty', function(t) {
const w = new W();
w._write = function(chunk, e, cb) {
process.nextTick(cb);
};
w.on('finish', function() {
t.end();
});
w.write(Buffer.allocUnsafe(1));
w.end(Buffer.alloc(0));
});
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