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<div class="section" id="module-apache_beam.io.filesystemio">
<span id="apache-beam-io-filesystemio-module"></span><h1>apache_beam.io.filesystemio module<a class="headerlink" href="#module-apache_beam.io.filesystemio" title="Permalink to this headline"></a></h1>
<p>Utilities for <code class="docutils literal"><span class="pre">FileSystem</span></code> implementations.</p>
<dl class="class">
<dt id="apache_beam.io.filesystemio.Downloader">
<em class="property">class </em><code class="descclassname">apache_beam.io.filesystemio.</code><code class="descname">Downloader</code><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#Downloader"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.Downloader" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal"><span class="pre">future.types.newobject.newobject</span></code></p>
<p>Download interface for a single file.</p>
<p>Implementations should support random access reads.</p>
<dl class="attribute">
<dt id="apache_beam.io.filesystemio.Downloader.size">
<code class="descname">size</code><a class="headerlink" href="#apache_beam.io.filesystemio.Downloader.size" title="Permalink to this definition"></a></dt>
<dd><p>Size of file to download.</p>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.Downloader.get_range">
<code class="descname">get_range</code><span class="sig-paren">(</span><em>start</em>, <em>end</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#Downloader.get_range"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.Downloader.get_range" title="Permalink to this definition"></a></dt>
<dd><p>Retrieve a given byte range [start, end) from this download.</p>
<dl class="docutils">
<dt>Range must be in this form:</dt>
<dd>0 &lt;= start &lt; end: Fetch the bytes from start to end.</dd>
</dl>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>start</strong> – (int) Initial byte offset.</li>
<li><strong>end</strong> – (int) Final byte offset, exclusive.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">(string) A buffer containing the requested data.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.io.filesystemio.Uploader">
<em class="property">class </em><code class="descclassname">apache_beam.io.filesystemio.</code><code class="descname">Uploader</code><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#Uploader"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.Uploader" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal"><span class="pre">future.types.newobject.newobject</span></code></p>
<p>Upload interface for a single file.</p>
<dl class="method">
<dt id="apache_beam.io.filesystemio.Uploader.put">
<code class="descname">put</code><span class="sig-paren">(</span><em>data</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#Uploader.put"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.Uploader.put" title="Permalink to this definition"></a></dt>
<dd><p>Write data to file sequentially.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>data</strong> – (memoryview) Data to write.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.Uploader.finish">
<code class="descname">finish</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#Uploader.finish"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.Uploader.finish" title="Permalink to this definition"></a></dt>
<dd><p>Signal to upload any remaining data and close the file.</p>
<p>File should be fully written upon return from this method.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body">Any error encountered during the upload.</td>
</tr>
</tbody>
</table>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.io.filesystemio.DownloaderStream">
<em class="property">class </em><code class="descclassname">apache_beam.io.filesystemio.</code><code class="descname">DownloaderStream</code><span class="sig-paren">(</span><em>downloader</em>, <em>mode='r'</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#DownloaderStream"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.DownloaderStream" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/2/library/io.html#io.RawIOBase" title="(in Python v2.7)"><code class="xref py py-class docutils literal"><span class="pre">io.RawIOBase</span></code></a></p>
<p>Provides a stream interface for Downloader objects.</p>
<p>Initializes the stream.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>downloader</strong> – (Downloader) Filesystem dependent implementation.</li>
<li><strong>mode</strong> – (string) Python mode attribute for this stream.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="method">
<dt id="apache_beam.io.filesystemio.DownloaderStream.readinto">
<code class="descname">readinto</code><span class="sig-paren">(</span><em>b</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#DownloaderStream.readinto"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.DownloaderStream.readinto" title="Permalink to this definition"></a></dt>
<dd><p>Read up to len(b) bytes into b.</p>
<p>Returns number of bytes read (0 for EOF).</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>b</strong> – (bytearray/memoryview) Buffer to read into.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.DownloaderStream.seek">
<code class="descname">seek</code><span class="sig-paren">(</span><em>offset</em>, <em>whence=0</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#DownloaderStream.seek"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.DownloaderStream.seek" title="Permalink to this definition"></a></dt>
<dd><p>Set the stream’s current offset.</p>
<p>Note if the new offset is out of bound, it is adjusted to either 0 or EOF.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>offset</strong> – seek offset as number.</li>
<li><strong>whence</strong> – seek mode. Supported modes are os.SEEK_SET (absolute seek),
os.SEEK_CUR (seek relative to the current position), and os.SEEK_END
(seek relative to the end, offset should be negative).</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><p class="first last"><code class="docutils literal"><span class="pre">ValueError</span></code> – When this stream is closed or if whence is invalid.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.DownloaderStream.tell">
<code class="descname">tell</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#DownloaderStream.tell"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.DownloaderStream.tell" title="Permalink to this definition"></a></dt>
<dd><p>Tell the stream’s current offset.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">current offset in reading this stream.</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><code class="docutils literal"><span class="pre">ValueError</span></code> – When this stream is closed.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.DownloaderStream.seekable">
<code class="descname">seekable</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#DownloaderStream.seekable"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.DownloaderStream.seekable" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.DownloaderStream.readable">
<code class="descname">readable</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#DownloaderStream.readable"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.DownloaderStream.readable" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.io.filesystemio.UploaderStream">
<em class="property">class </em><code class="descclassname">apache_beam.io.filesystemio.</code><code class="descname">UploaderStream</code><span class="sig-paren">(</span><em>uploader</em>, <em>mode='w'</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#UploaderStream"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.UploaderStream" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/2/library/io.html#io.RawIOBase" title="(in Python v2.7)"><code class="xref py py-class docutils literal"><span class="pre">io.RawIOBase</span></code></a></p>
<p>Provides a stream interface for Uploader objects.</p>
<p>Initializes the stream.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>uploader</strong> – (Uploader) Filesystem dependent implementation.</li>
<li><strong>mode</strong> – (string) Python mode attribute for this stream.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="method">
<dt id="apache_beam.io.filesystemio.UploaderStream.tell">
<code class="descname">tell</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#UploaderStream.tell"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.UploaderStream.tell" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.UploaderStream.write">
<code class="descname">write</code><span class="sig-paren">(</span><em>b</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#UploaderStream.write"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.UploaderStream.write" title="Permalink to this definition"></a></dt>
<dd><p>Write bytes from b.</p>
<p>Returns number of bytes written (&lt;= len(b)).</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>b</strong> – (memoryview) Buffer with data to write.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.UploaderStream.close">
<code class="descname">close</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#UploaderStream.close"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.UploaderStream.close" title="Permalink to this definition"></a></dt>
<dd><p>Complete the upload and close this stream.</p>
<p>This method has no effect if the stream is already closed.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body">Any error encountered by the uploader.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.UploaderStream.writable">
<code class="descname">writable</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#UploaderStream.writable"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.UploaderStream.writable" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.io.filesystemio.PipeStream">
<em class="property">class </em><code class="descclassname">apache_beam.io.filesystemio.</code><code class="descname">PipeStream</code><span class="sig-paren">(</span><em>recv_pipe</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#PipeStream"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.PipeStream" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal"><span class="pre">future.types.newobject.newobject</span></code></p>
<p>A class that presents a pipe connection as a readable stream.</p>
<dl class="method">
<dt id="apache_beam.io.filesystemio.PipeStream.read">
<code class="descname">read</code><span class="sig-paren">(</span><em>size</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#PipeStream.read"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.PipeStream.read" title="Permalink to this definition"></a></dt>
<dd><p>Read data from the wrapped pipe connection.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>size</strong> – Number of bytes to read. Actual number of bytes read is always
equal to size unless EOF is reached.</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">data read as str.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.PipeStream.tell">
<code class="descname">tell</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#PipeStream.tell"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.PipeStream.tell" title="Permalink to this definition"></a></dt>
<dd><p>Tell the file’s current offset.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">current offset in reading this file.</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><code class="docutils literal"><span class="pre">ValueError</span></code> – When this stream is closed.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="apache_beam.io.filesystemio.PipeStream.seek">
<code class="descname">seek</code><span class="sig-paren">(</span><em>offset</em>, <em>whence=0</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filesystemio.html#PipeStream.seek"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filesystemio.PipeStream.seek" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
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