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97 lines
2.3 KiB
97 lines
2.3 KiB
'use strict';
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require('../common');
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const assert = require('assert');
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const Readable = require('stream').Readable;
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test1();
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test2();
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function test1() {
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const r = new Readable();
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// should not end when we get a Buffer.alloc(0) or '' as the _read
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// result that just means that there is *temporarily* no data, but to
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// go ahead and try again later.
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//
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// note that this is very unusual. it only works for crypto streams
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// because the other side of the stream will call read(0) to cycle
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// data through openssl. that's why setImmediate() is used to call
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// r.read(0) again later, otherwise there is no more work being done
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// and the process just exits.
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const buf = Buffer.alloc(5, 'x');
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let reads = 5;
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r._read = function(n) {
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switch (reads--) {
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case 5:
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return setImmediate(function() {
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return r.push(buf);
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});
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case 4:
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setImmediate(function() {
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return r.push(Buffer.alloc(0));
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});
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return setImmediate(r.read.bind(r, 0));
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case 3:
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setImmediate(r.read.bind(r, 0));
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return process.nextTick(function() {
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return r.push(Buffer.alloc(0));
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});
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case 2:
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setImmediate(r.read.bind(r, 0));
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return r.push(Buffer.alloc(0)); // Not-EOF!
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case 1:
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return r.push(buf);
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case 0:
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return r.push(null); // EOF
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default:
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throw new Error('unreachable');
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}
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};
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const results = [];
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function flow() {
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let chunk;
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while (null !== (chunk = r.read()))
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results.push(chunk + '');
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}
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r.on('readable', flow);
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r.on('end', function() {
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results.push('EOF');
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});
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flow();
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process.on('exit', function() {
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assert.deepStrictEqual(results, [ 'xxxxx', 'xxxxx', 'EOF' ]);
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console.log('ok');
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});
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}
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function test2() {
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const r = new Readable({ encoding: 'base64' });
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let reads = 5;
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r._read = function(n) {
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if (!reads--)
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return r.push(null); // EOF
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else
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return r.push(Buffer.from('x'));
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};
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const results = [];
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function flow() {
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let chunk;
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while (null !== (chunk = r.read()))
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results.push(chunk + '');
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}
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r.on('readable', flow);
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r.on('end', function() {
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results.push('EOF');
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});
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flow();
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process.on('exit', function() {
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assert.deepStrictEqual(results, [ 'eHh4', 'eHg=', 'EOF' ]);
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console.log('ok');
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});
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}
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