[Process] getIncrementalOutput should work without calling getOutput

romainneutron · romainneutron · commit 260aeb28e4a2 · 2016-03-05T19:22:12.000+01:00
diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
@@ -463,13 +463,7 @@ public function isOutputDisabled()
      */
     public function getOutput()
     {
-        if ($this->outputDisabled) {
-            throw new LogicException('Output has been disabled.');
-        }
-
-        $this->requireProcessIsStarted(__FUNCTION__);
-
-        $this->readPipes(false, '\\' === DIRECTORY_SEPARATOR ? !$this->processInformation['running'] : true);
+        $this->readPipesForOutput(__FUNCTION__);
 
         if (false === $ret = stream_get_contents($this->stdout, -1, 0)) {
             return '';
@@ -491,11 +485,7 @@ public function getOutput()
      */
     public function getIncrementalOutput()
     {
-        if ($this->outputDisabled) {
-            throw new LogicException('Output has been disabled.');
-        }
-
-        $this->requireProcessIsStarted(__FUNCTION__);
+        $this->readPipesForOutput(__FUNCTION__);
 
         $latest = stream_get_contents($this->stdout, -1, $this->incrementalOutputOffset);
         $this->incrementalOutputOffset = ftell($this->stdout);
@@ -531,13 +521,7 @@ public function clearOutput()
      */
     public function getErrorOutput()
     {
-        if ($this->outputDisabled) {
-            throw new LogicException('Output has been disabled.');
-        }
-
-        $this->requireProcessIsStarted(__FUNCTION__);
-
-        $this->readPipes(false, '\\' === DIRECTORY_SEPARATOR ? !$this->processInformation['running'] : true);
+        $this->readPipesForOutput(__FUNCTION__);
 
         if (false === $ret = stream_get_contents($this->stderr, -1, 0)) {
             return '';
@@ -560,11 +544,7 @@ public function getErrorOutput()
      */
     public function getIncrementalErrorOutput()
     {
-        if ($this->outputDisabled) {
-            throw new LogicException('Output has been disabled.');
-        }
-
-        $this->requireProcessIsStarted(__FUNCTION__);
+        $this->readPipesForOutput(__FUNCTION__);
 
         $latest = stream_get_contents($this->stderr, -1, $this->incrementalErrorOutputOffset);
         $this->incrementalErrorOutputOffset = ftell($this->stderr);
@@ -1328,6 +1308,24 @@ protected function isSigchildEnabled()
         return self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild');
     }
 
+    /**
+     * Reads pipes for the freshest output.
+     *
+     * @param $caller The name of the method that needs fresh outputs
+     *
+     * @throw LogicException in case output has been disabled or process is not started
+     */
+    private function readPipesForOutput($caller)
+    {
+        if ($this->outputDisabled) {
+            throw new LogicException('Output has been disabled.');
+        }
+
+        $this->requireProcessIsStarted($caller);
+
+        $this->updateStatus(false);
+    }
+
     /**
      * Validates and returns the filtered timeout.
      *
diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -1165,6 +1165,31 @@ public function pipesCodeProvider()
         return $codes;
     }
 
+    /**
+     * @dataProvider provideVariousIncrementals
+     */
+    public function testIncrementalOutputDoesNotRequiresAnotherCall($stream, $method) {
+        $process = new Process(self::$phpBin." -r '\$n = 0; while (\$n < 3) { file_put_contents(\"$stream\", \$n, 1); \$n++; usleep(1000); }'", null, null, null, null);
+        $process->start();
+        $result = '';
+        $limit = microtime(true) + 3;
+        $expected = '012';
+
+        while ($result !== $expected && microtime(true) < $limit) {
+            $result .= $process->$method();
+        }
+
+        $this->assertSame($expected, $result);
+        $process->stop();
+    }
+
+    public function provideVariousIncrementals() {
+        return array(
+            array('php://stdout', 'getIncrementalOutput'),
+            array('php://stderr', 'getIncrementalErrorOutput'),
+        );
+    }
+
     /**
      * provides default method names for simple getter/setter.
      */
