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115 | office | 1 | <?php |
2 | |||
3 | /* |
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4 | * This file is part of the Symfony package. |
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5 | * |
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6 | * (c) Fabien Potencier <fabien@symfony.com> |
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7 | * |
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8 | * For the full copyright and license information, please view the LICENSE |
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9 | * file that was distributed with this source code. |
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10 | */ |
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11 | |||
12 | namespace Symfony\Component\Process\Pipes; |
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13 | |||
14 | use Symfony\Component\Process\Exception\InvalidArgumentException; |
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15 | |||
16 | /** |
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17 | * @author Romain Neutron <imprec@gmail.com> |
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18 | * |
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19 | * @internal |
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20 | */ |
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21 | abstract class AbstractPipes implements PipesInterface |
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22 | { |
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23 | /** @var array */ |
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24 | public $pipes = array(); |
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25 | |||
26 | /** @var string */ |
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27 | private $inputBuffer = ''; |
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28 | /** @var resource|scalar|\Iterator|null */ |
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29 | private $input; |
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30 | /** @var bool */ |
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31 | private $blocked = true; |
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32 | |||
33 | public function __construct($input) |
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34 | { |
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35 | if (is_resource($input) || $input instanceof \Iterator) { |
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36 | $this->input = $input; |
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37 | } elseif (is_string($input)) { |
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38 | $this->inputBuffer = $input; |
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39 | } else { |
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40 | $this->inputBuffer = (string) $input; |
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41 | } |
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42 | } |
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43 | |||
44 | /** |
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45 | * {@inheritdoc} |
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46 | */ |
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47 | public function close() |
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48 | { |
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49 | foreach ($this->pipes as $pipe) { |
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50 | fclose($pipe); |
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51 | } |
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52 | $this->pipes = array(); |
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53 | } |
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54 | |||
55 | /** |
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56 | * Returns true if a system call has been interrupted. |
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57 | * |
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58 | * @return bool |
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59 | */ |
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60 | protected function hasSystemCallBeenInterrupted() |
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61 | { |
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62 | $lastError = error_get_last(); |
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63 | |||
64 | // stream_select returns false when the `select` system call is interrupted by an incoming signal |
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65 | return isset($lastError['message']) && false !== stripos($lastError['message'], 'interrupted system call'); |
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66 | } |
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67 | |||
68 | /** |
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69 | * Unblocks streams. |
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70 | */ |
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71 | protected function unblock() |
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72 | { |
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73 | if (!$this->blocked) { |
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74 | return; |
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75 | } |
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76 | |||
77 | foreach ($this->pipes as $pipe) { |
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78 | stream_set_blocking($pipe, 0); |
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79 | } |
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80 | if (is_resource($this->input)) { |
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81 | stream_set_blocking($this->input, 0); |
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82 | } |
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83 | |||
84 | $this->blocked = false; |
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85 | } |
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86 | |||
87 | /** |
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88 | * Writes input to stdin. |
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89 | * |
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90 | * @throws InvalidArgumentException When an input iterator yields a non supported value |
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91 | */ |
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92 | protected function write() |
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93 | { |
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94 | if (!isset($this->pipes[0])) { |
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95 | return; |
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96 | } |
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97 | $input = $this->input; |
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98 | |||
99 | if ($input instanceof \Iterator) { |
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100 | if (!$input->valid()) { |
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101 | $input = null; |
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102 | } elseif (is_resource($input = $input->current())) { |
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103 | stream_set_blocking($input, 0); |
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104 | } elseif (!isset($this->inputBuffer[0])) { |
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105 | if (!is_string($input)) { |
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106 | if (!is_scalar($input)) { |
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107 | throw new InvalidArgumentException(sprintf('%s yielded a value of type "%s", but only scalars and stream resources are supported', get_class($this->input), gettype($input))); |
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108 | } |
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109 | $input = (string) $input; |
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110 | } |
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111 | $this->inputBuffer = $input; |
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112 | $this->input->next(); |
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113 | $input = null; |
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114 | } else { |
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115 | $input = null; |
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116 | } |
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117 | } |
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118 | |||
119 | $r = $e = array(); |
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120 | $w = array($this->pipes[0]); |
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121 | |||
122 | // let's have a look if something changed in streams |
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123 | if (false === $n = @stream_select($r, $w, $e, 0, 0)) { |
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124 | return; |
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125 | } |
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126 | |||
127 | foreach ($w as $stdin) { |
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128 | if (isset($this->inputBuffer[0])) { |
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129 | $written = fwrite($stdin, $this->inputBuffer); |
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130 | $this->inputBuffer = substr($this->inputBuffer, $written); |
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131 | if (isset($this->inputBuffer[0])) { |
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132 | return array($this->pipes[0]); |
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133 | } |
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134 | } |
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135 | |||
136 | if ($input) { |
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137 | for (;;) { |
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138 | $data = fread($input, self::CHUNK_SIZE); |
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139 | if (!isset($data[0])) { |
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140 | break; |
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141 | } |
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142 | $written = fwrite($stdin, $data); |
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143 | $data = substr($data, $written); |
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144 | if (isset($data[0])) { |
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145 | $this->inputBuffer = $data; |
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146 | |||
147 | return array($this->pipes[0]); |
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148 | } |
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149 | } |
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150 | if (feof($input)) { |
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151 | if ($this->input instanceof \Iterator) { |
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152 | $this->input->next(); |
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153 | } else { |
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154 | $this->input = null; |
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155 | } |
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156 | } |
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157 | } |
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158 | } |
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159 | |||
160 | // no input to read on resource, buffer is empty |
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161 | if (!isset($this->inputBuffer[0]) && !($this->input instanceof \Iterator ? $this->input->valid() : $this->input)) { |
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162 | $this->input = null; |
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163 | fclose($this->pipes[0]); |
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164 | unset($this->pipes[0]); |
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165 | } elseif (!$w) { |
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166 | return array($this->pipes[0]); |
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167 | } |
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168 | } |
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169 | } |