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<h1>Source code for hansken_extraction_plugin.api.extraction_trace</h1><div class="highlight"><pre>
<span></span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">This module contains the different Trace apis.</span>
<span class="sd">Note that there are a couple of different traces:</span>
<span class="sd"> * The ExtractionTrace and MetaExtractionTrace, which are offered to the process function.</span>
<span class="sd"> * ExtractionTraceBuilder, which is a trace that can be built; it does not exist in hansken yet, but it is added after</span>
<span class="sd"> building.</span>
<span class="sd"> * SearchTrace, which represents an immutable trace which is returned after searching for traces.</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">from</span> <span class="nn">abc</span> <span class="kn">import</span> <span class="n">ABC</span><span class="p">,</span> <span class="n">abstractmethod</span>
<span class="kn">from</span> <span class="nn">io</span> <span class="kn">import</span> <span class="n">BufferedReader</span><span class="p">,</span> <span class="n">BufferedWriter</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Any</span><span class="p">,</span> <span class="n">Literal</span><span class="p">,</span> <span class="n">Mapping</span><span class="p">,</span> <span class="n">Optional</span><span class="p">,</span> <span class="n">Union</span>
<span class="kn">from</span> <span class="nn">hansken_extraction_plugin.api.tracelet</span> <span class="kn">import</span> <span class="n">Tracelet</span>
<span class="kn">from</span> <span class="nn">hansken_extraction_plugin.api.transformation</span> <span class="kn">import</span> <span class="n">Transformation</span>
<div class="viewcode-block" id="ExtractionTraceBuilder"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTraceBuilder">[docs]</a><span class="k">class</span> <span class="nc">ExtractionTraceBuilder</span><span class="p">(</span><span class="n">ABC</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> ExtractionTrace that can be build.</span>
<span class="sd"> Represents child traces.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<div class="viewcode-block" id="ExtractionTraceBuilder.update"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTraceBuilder.update">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key_or_updates</span><span class="p">:</span> <span class="n">Union</span><span class="p">[</span><span class="n">Mapping</span><span class="p">,</span> <span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="n">value</span><span class="p">:</span> <span class="n">Any</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">data</span><span class="p">:</span> <span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="nb">bytes</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s1">&#39;ExtractionTraceBuilder&#39;</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Update or add metadata properties for this `.ExtractionTraceBuilder`.</span>
<span class="sd"> Can be used to update the name of the Trace represented by this builder,</span>
<span class="sd"> if not already set.</span>
<span class="sd"> :param key_or_updates: either a `str` (the metadata property to be</span>
<span class="sd"> updated) or a mapping supplying both keys and values to be updated</span>
<span class="sd"> :param value: the value to update metadata property *key* to (used</span>
<span class="sd"> only when *key_or_updates* is a `str`, an exception will be thrown</span>
<span class="sd"> if *key_or_updates* is a mapping)</span>
<span class="sd"> :param data: a `dict` mapping data type / stream name to bytes to be</span>
<span class="sd"> added to the trace</span>
<span class="sd"> :return: this `.ExtractionTraceBuilder`</span>
<span class="sd"> &quot;&quot;&quot;</span></div>
<div class="viewcode-block" id="ExtractionTraceBuilder.add_tracelet"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTraceBuilder.add_tracelet">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">add_tracelet</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
<span class="n">tracelet</span><span class="p">:</span> <span class="n">Union</span><span class="p">[</span><span class="n">Tracelet</span><span class="p">,</span> <span class="nb">str</span><span class="p">],</span>
<span class="n">value</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Any</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s1">&#39;ExtractionTraceBuilder&#39;</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Add a `.Tracelet` to this `.ExtractionTraceBuilder`.</span>
<span class="sd"> :param tracelet: the Tracelet or tracelet type (supplied as a `str`) to add</span>
<span class="sd"> :param value: the tracelet properties to add (only applicable when *tracelet* is a `str`)</span>
<span class="sd"> :return: this `.ExtractionTraceBuilder`</span>
<span class="sd"> &quot;&quot;&quot;</span></div>
<div class="viewcode-block" id="ExtractionTraceBuilder.add_transformation"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTraceBuilder.add_transformation">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">add_transformation</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data_type</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">transformation</span><span class="p">:</span> <span class="n">Transformation</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s1">&#39;ExtractionTraceBuilder&#39;</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Update or add transformations for this `.ExtractionTraceBuilder`.</span>
<span class="sd"> :param data_type: data type of the Transformation</span>
<span class="sd"> :param transformation: the Transformation to add</span>
<span class="sd"> :return: this `.ExtractionTraceBuilder`</span>
<span class="sd"> &quot;&quot;&quot;</span></div>
<div class="viewcode-block" id="ExtractionTraceBuilder.child_builder"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTraceBuilder.child_builder">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">child_builder</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s1">&#39;ExtractionTraceBuilder&#39;</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Create a new `.TraceBuilder` to build a child trace to the trace to be represented by this builder.</span>
<span class="sd"> .. note::</span>
<span class="sd"> Traces should be created and built in depth first order,</span>
<span class="sd"> parent before child (pre-order).</span>
<span class="sd"> :return: a `.TraceBuilder` set up to save a new trace as the child</span>
<span class="sd"> trace of this builder</span>
<span class="sd"> &quot;&quot;&quot;</span></div>
<div class="viewcode-block" id="ExtractionTraceBuilder.add_data"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTraceBuilder.add_data">[docs]</a> <span class="k">def</span> <span class="nf">add_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">stream</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">data</span><span class="p">:</span> <span class="nb">bytes</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s1">&#39;ExtractionTraceBuilder&#39;</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Add data to this trace as a named stream.</span>
<span class="sd"> :param stream: name of the data stream to be added</span>
<span class="sd"> :param data: data to be attached</span>
<span class="sd"> :return: this `.ExtractionTraceBuilder`</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">data</span><span class="o">=</span><span class="p">{</span><span class="n">stream</span><span class="p">:</span> <span class="n">data</span><span class="p">})</span></div>
<div class="viewcode-block" id="ExtractionTraceBuilder.open"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTraceBuilder.open">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">open</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data_type</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="n">offset</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">size</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="n">mode</span><span class="p">:</span> <span class="n">Literal</span><span class="p">[</span><span class="s1">&#39;rb&#39;</span><span class="p">,</span> <span class="s1">&#39;wb&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;rb&#39;</span><span class="p">)</span> \
<span class="o">-&gt;</span> <span class="n">Union</span><span class="p">[</span><span class="n">BufferedReader</span><span class="p">,</span> <span class="n">BufferedWriter</span><span class="p">]:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Open a data stream to read or write data from or to the `.ExtractionTrace`.</span>
<span class="sd"> :param data_type: the data type of the datastream, &#39;raw&#39; by default</span>
<span class="sd"> :param offset: byte offset to start the stream on when reading</span>
<span class="sd"> :param size: the number of bytes to make available when reading</span>
<span class="sd"> :param mode: &#39;rb&#39; for reading, &#39;wb&#39; for writing</span>
<span class="sd"> :return: a file-like object to read or write bytes from the named stream</span>
<span class="sd"> &quot;&quot;&quot;</span></div>
<div class="viewcode-block" id="ExtractionTraceBuilder.build"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTraceBuilder.build">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">build</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Save the trace being built by this builder to remote.</span>
<span class="sd"> .. note::</span>
<span class="sd"> Building more than once will result in an error being raised.</span>
<span class="sd"> :return: the new trace&#39; id</span>
<span class="sd"> &quot;&quot;&quot;</span></div></div>
<div class="viewcode-block" id="Trace"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.Trace">[docs]</a><span class="k">class</span> <span class="nc">Trace</span><span class="p">(</span><span class="n">ABC</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;All trace classes should be able to return values.&quot;&quot;&quot;</span>
<div class="viewcode-block" id="Trace.get"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.Trace.get">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">default</span><span class="p">:</span> <span class="n">Any</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Any</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Return metadata properties for this `.ExtractionTrace`.</span>
<span class="sd"> :param key: the metadata property to be retrieved</span>
<span class="sd"> :param default: value returned if property is not set</span>
<span class="sd"> :return: the value of the requested metadata property</span>
<span class="sd"> &quot;&quot;&quot;</span></div></div>
<div class="viewcode-block" id="SearchTrace"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.SearchTrace">[docs]</a><span class="k">class</span> <span class="nc">SearchTrace</span><span class="p">(</span><span class="n">Trace</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;SearchTraces represent traces returned when searching for traces.&quot;&quot;&quot;</span>
<div class="viewcode-block" id="SearchTrace.open"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.SearchTrace.open">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">open</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">stream</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s1">&#39;raw&#39;</span><span class="p">,</span> <span class="n">offset</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">size</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">BufferedReader</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Open a data stream of the data that is being processed.</span>
<span class="sd"> :param stream: data stream of trace to open. defaults to raw. other examples are html, text, etc.</span>
<span class="sd"> :param offset: byte offset to start the stream on</span>
<span class="sd"> :param size: the number of bytes to make available</span>
<span class="sd"> :return: a file-like object to read bytes from the named stream</span>
<span class="sd"> &quot;&quot;&quot;</span></div></div>
<div class="viewcode-block" id="MetaExtractionTrace"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.MetaExtractionTrace">[docs]</a><span class="k">class</span> <span class="nc">MetaExtractionTrace</span><span class="p">(</span><span class="n">Trace</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> MetaExtractionTraces contain only metadata.</span>
<span class="sd"> This class represenst traces during the extraction of an extraction plugin without a data stream.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<div class="viewcode-block" id="MetaExtractionTrace.update"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.MetaExtractionTrace.update">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key_or_updates</span><span class="p">:</span> <span class="n">Union</span><span class="p">[</span><span class="n">Mapping</span><span class="p">,</span> <span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="n">value</span><span class="p">:</span> <span class="n">Any</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">data</span><span class="p">:</span> <span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="nb">bytes</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Update or add metadata properties for this `.ExtractionTrace`.</span>
<span class="sd"> :param key_or_updates: either a `str` (the metadata property to be</span>
<span class="sd"> updated) or a mapping supplying both keys and values to be updated</span>
<span class="sd"> :param value: the value to update metadata property *key* to (used</span>
<span class="sd"> only when *key_or_updates* is a `str`, an exception will be thrown</span>
<span class="sd"> if *key_or_updates* is a mapping)</span>
<span class="sd"> :param data: a `dict` mapping data type / stream name to bytes to be</span>
<span class="sd"> added to the trace</span>
<span class="sd"> &quot;&quot;&quot;</span></div>
<div class="viewcode-block" id="MetaExtractionTrace.add_tracelet"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.MetaExtractionTrace.add_tracelet">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">add_tracelet</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
<span class="n">tracelet</span><span class="p">:</span> <span class="n">Union</span><span class="p">[</span><span class="n">Tracelet</span><span class="p">,</span> <span class="nb">str</span><span class="p">],</span>
<span class="n">value</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Any</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Add a `.Tracelet` to this `.MetaExtractionTrace`.</span>
<span class="sd"> :param tracelet: the Tracelet or tracelet type to add</span>
<span class="sd"> :param value: the tracelet properties to add (only applicable when *tracelet* is a tracelet type)</span>
<span class="sd"> &quot;&quot;&quot;</span></div>
<div class="viewcode-block" id="MetaExtractionTrace.add_transformation"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.MetaExtractionTrace.add_transformation">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">add_transformation</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data_type</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">transformation</span><span class="p">:</span> <span class="n">Transformation</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Update or add transformations for this `.ExtractionTraceBuilder`.</span>
<span class="sd"> :param data_type: data type of the Transformation</span>
<span class="sd"> :param transformation: the Transformation to add</span>
<span class="sd"> &quot;&quot;&quot;</span></div>
<div class="viewcode-block" id="MetaExtractionTrace.child_builder"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.MetaExtractionTrace.child_builder">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">child_builder</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">ExtractionTraceBuilder</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Create a `.TraceBuilder` to build a trace to be saved as a child of this `.Trace`.</span>
<span class="sd"> A new trace will only be added to the index once explicitly saved (e.g.</span>
<span class="sd"> through `.TraceBuilder.build`).</span>
<span class="sd"> .. note::</span>
<span class="sd"> Traces should be created and built in depth first order,</span>
<span class="sd"> parent before child (pre-order).</span>
<span class="sd"> :param name: the name for the trace being built</span>
<span class="sd"> :return: a `.TraceBuilder` set up to create a child trace of this `.MetaExtractionTrace`</span>
<span class="sd"> &quot;&quot;&quot;</span></div></div>
<div class="viewcode-block" id="ExtractionTrace"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTrace">[docs]</a><span class="k">class</span> <span class="nc">ExtractionTrace</span><span class="p">(</span><span class="n">MetaExtractionTrace</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Trace offered to be processed.&quot;&quot;&quot;</span>
<div class="viewcode-block" id="ExtractionTrace.open"><a class="viewcode-back" href="../../../dev/python/api/hansken_extraction_plugin.api.extraction_trace.html#hansken_extraction_plugin.api.extraction_trace.ExtractionTrace.open">[docs]</a> <span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">open</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data_type</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="n">offset</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">size</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="n">mode</span><span class="p">:</span> <span class="n">Literal</span><span class="p">[</span><span class="s1">&#39;rb&#39;</span><span class="p">,</span> <span class="s1">&#39;wb&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;rb&#39;</span><span class="p">)</span> \
<span class="o">-&gt;</span> <span class="n">Union</span><span class="p">[</span><span class="n">BufferedReader</span><span class="p">,</span> <span class="n">BufferedWriter</span><span class="p">]:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Open a data stream to read or write data from or to the `.ExtractionTrace`.</span>
<span class="sd"> :param data_type: the data type of the datastream, &#39;raw&#39; by default</span>
<span class="sd"> :param offset: byte offset to start the stream on when reading</span>
<span class="sd"> :param size: the number of bytes to make available when reading</span>
<span class="sd"> :param mode: &#39;rb&#39; for reading, &#39;wb&#39; for writing</span>
<span class="sd"> :return: a file-like object to read or write bytes from the named stream</span>
<span class="sd"> &quot;&quot;&quot;</span></div></div>
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