blob: 710940b6e6f8ec175adbdfe54afeb671dac64e19 (
plain)
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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
<?php
namespace Clue\StreamFilter;
use php_user_filter;
use InvalidArgumentException;
use ReflectionFunction;
use Exception;
/**
*
* @internal
* @see append()
* @see prepend()
*/
class CallbackFilter extends php_user_filter
{
private $callback;
private $closed = true;
private $supportsClose = false;
public function onCreate()
{
$this->closed = false;
if (!is_callable($this->params)) {
throw new InvalidArgumentException('No valid callback parameter given to stream_filter_(append|prepend)');
}
$this->callback = $this->params;
// callback supports end event if it accepts invocation without arguments
$ref = new ReflectionFunction($this->callback);
$this->supportsClose = ($ref->getNumberOfRequiredParameters() === 0);
return true;
}
public function onClose()
{
$this->closed = true;
// callback supports closing and is not already closed
if ($this->supportsClose) {
$this->supportsClose = false;
// invoke without argument to signal end and discard resulting buffer
try {
call_user_func($this->callback);
} catch (Exception $ignored) {
// this might be called during engine shutdown, so it's not safe
// to raise any errors or exceptions here
// trigger_error('Error closing filter: ' . $ignored->getMessage(), E_USER_WARNING);
}
}
$this->callback = null;
}
public function filter($in, $out, &$consumed, $closing)
{
// concatenate whole buffer from input brigade
$data = '';
while ($bucket = stream_bucket_make_writeable($in)) {
$consumed += $bucket->datalen;
$data .= $bucket->data;
}
// skip processing callback that already ended
if ($this->closed) {
return PSFS_FEED_ME;
}
// only invoke filter function if buffer is not empty
// this may skip flushing a closing filter
if ($data !== '') {
try {
$data = call_user_func($this->callback, $data);
} catch (Exception $e) {
// exception should mark filter as closed
$this->onClose();
trigger_error('Error invoking filter: ' . $e->getMessage(), E_USER_WARNING);
return PSFS_ERR_FATAL;
}
}
// mark filter as closed after processing closing chunk
if ($closing) {
$this->closed = true;
// callback supports closing and is not already closed
if ($this->supportsClose) {
$this->supportsClose = false;
// invoke without argument to signal end and append resulting buffer
try {
$data .= call_user_func($this->callback);
} catch (Exception $e) {
trigger_error('Error ending filter: ' . $e->getMessage(), E_USER_WARNING);
return PSFS_ERR_FATAL;
}
}
}
if ($data !== '') {
// create a new bucket for writing the resulting buffer to the output brigade
// reusing an existing bucket turned out to be bugged in some environments (ancient PHP versions and HHVM)
$bucket = @stream_bucket_new($this->stream, $data);
// legacy PHP versions (PHP < 5.4) do not support passing data from the event signal handler
// because closing the stream invalidates the stream and its stream bucket brigade before
// invoking the filter close handler.
if ($bucket !== false) {
stream_bucket_append($out, $bucket);
}
}
return PSFS_PASS_ON;
}
}
|
