1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
'use strict';
const common = require('../common');
const assert = require('assert');
const Readable = require('stream').Readable;
test1();
test2();
function test1() {
const r = new Readable();
// should not end when we get a Buffer(0) or '' as the _read result
// that just means that there is *temporarily* no data, but to go
// ahead and try again later.
//
// note that this is very unusual. it only works for crypto streams
// because the other side of the stream will call read(0) to cycle
// data through openssl. that's why we set the timeouts to call
// r.read(0) again later, otherwise there is no more work being done
// and the process just exits.
const buf = Buffer(5).fill('x');
let reads = 5;
const timeout = common.platformTimeout(50);
r._read = function(n) {
switch (reads--) {
case 0:
return r.push(null); // EOF
case 1:
return r.push(buf);
case 2:
setTimeout(r.read.bind(r, 0), timeout);
return r.push(new Buffer(0)); // Not-EOF!
case 3:
setTimeout(r.read.bind(r, 0), timeout);
return process.nextTick(function() {
return r.push(new Buffer(0));
});
case 4:
setTimeout(r.read.bind(r, 0), timeout);
return setTimeout(function() {
return r.push(new Buffer(0));
});
case 5:
return setTimeout(function() {
return r.push(buf);
});
default:
throw new Error('unreachable');
}
};
const results = [];
function flow() {
let chunk;
while (null !== (chunk = r.read()))
results.push(chunk + '');
}
r.on('readable', flow);
r.on('end', function() {
results.push('EOF');
});
flow();
process.on('exit', function() {
assert.deepEqual(results, [ 'xxxxx', 'xxxxx', 'EOF' ]);
console.log('ok');
});
}
function test2() {
var r = new Readable({ encoding: 'base64' });
var reads = 5;
r._read = function(n) {
if (!reads--)
return r.push(null); // EOF
else
return r.push(new Buffer('x'));
};
var results = [];
function flow() {
var chunk;
while (null !== (chunk = r.read()))
results.push(chunk + '');
}
r.on('readable', flow);
r.on('end', function() {
results.push('EOF');
});
flow();
process.on('exit', function() {
assert.deepEqual(results, [ 'eHh4', 'eHg=', 'EOF' ]);
console.log('ok');
});
}
|
