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vendor/guzzlehttp/psr7/src/LazyOpenStream.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Lazily reads or writes to a file that is opened only after an IO operation
+ * take place on the stream.
+ */
+final class LazyOpenStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var string */
+    private $filename;
+
+    /** @var string */
+    private $mode;
+
+    /**
+     * @var StreamInterface
+     */
+    private $stream;
+
+    /**
+     * @param string $filename File to lazily open
+     * @param string $mode     fopen mode to use when opening the stream
+     */
+    public function __construct(string $filename, string $mode)
+    {
+        $this->filename = $filename;
+        $this->mode = $mode;
+
+        // unsetting the property forces the first access to go through
+        // __get().
+        unset($this->stream);
+    }
+
+    /**
+     * Creates the underlying stream lazily when required.
+     */
+    protected function createStream(): StreamInterface
+    {
+        return Utils::streamFor(Utils::tryFopen($this->filename, $this->mode));
+    }
+}