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Hansken Extraction Plugins for plugin developers
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<li class="toctree-l3"><a class="reference internal" href="#label-plugin"><code class="docutils literal notranslate"><span class="pre">label_plugin</span></code></a></li>
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<li class="toctree-l3"><a class="reference internal" href="#build-plugin"><code class="docutils literal notranslate"><span class="pre">build_plugin</span></code></a></li>
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<li class="toctree-l4"><a class="reference internal" href="#requirements">Requirements</a></li>
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<li class="toctree-l4"><a class="reference internal" href="#command-usage">Command usage</a></li>
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<section id="packaging">
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<h1>Packaging<a class="headerlink" href="#packaging" title="Link to this heading"></a></h1>
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<p>Extraction plugins are packaged as OCI images (also known as Docker images).
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The OCI images are <em>labeled</em> with the PluginInfo.
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To automate packaging of a Python plugin and labeling the OCI image,
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the Extraction Plugin SDK comes with three utility applications: <code class="docutils literal notranslate"><span class="pre">label_plugin</span></code>, <code class="docutils literal notranslate"><span class="pre">build_plugin</span></code> and <code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code>.</p>
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<p>To package a plugin, make sure that the Extraction Plugins SDK is <a class="reference internal" href="getting_started.html"><span class="doc">installed</span></a>, as well as Docker.
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Next build and label your plugin as described in the following sections.</p>
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<p>To verify that the image has been built, use the following command to view all local images:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker<span class="w"> </span>images
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</pre></div>
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</div>
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<p>Once your plugin is packaged and labelled, it can be published or ‘uploaded’ to Hansken.
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See “<a class="reference internal" href="../concepts/extraction_plugins.html#upload-plugin"><span class="std std-ref">Upload the plugin to Hansken</span></a>” for instructions.</p>
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<section id="label-plugin">
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<h2><code class="docutils literal notranslate"><span class="pre">label_plugin</span></code><a class="headerlink" href="#label-plugin" title="Link to this heading"></a></h2>
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<p><code class="docutils literal notranslate"><span class="pre">label_plugin</span></code> is a utility to add labels to an extraction plugin image.
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To label a plugin, first build the plugin image with <a class="reference external" href="https://docs.docker.com/reference/cli/docker/image/build/">docker build</a>;
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for example by using one of the following commands:</p>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>docker<span class="w"> </span>build<span class="w"> </span>.<span class="w"> </span>-t<span class="w"> </span>my_plugin
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docker<span class="w"> </span>build<span class="w"> </span>.<span class="w"> </span>-t<span class="w"> </span>my_plugin<span class="w"> </span>--build-arg<span class="w"> </span><span class="nv">https_proxy</span><span class="o">=</span>http://your_proxy:8080
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</pre></div>
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</div>
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<p>Next, run the <code class="docutils literal notranslate"><span class="pre">label_plugin</span></code> utility to label the build plugin container:</p>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>label_plugin<span class="w"> </span>my_plugin
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</pre></div>
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</div>
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<p>This utility will briefly start your plugin using Docker, and requests the PluginInfo from the plugin.
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The information from the PluginInfo will be added as <a class="reference external" href="https://docs.docker.com/config/labels-custom-metadata/">labels</a> to the plugin image.
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The result of <code class="docutils literal notranslate"><span class="pre">label_plugin</span></code> is a plugin image that can be published to a docker/OCI image registry.</p>
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</section>
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<section id="build-plugin">
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<h2><code class="docutils literal notranslate"><span class="pre">build_plugin</span></code><a class="headerlink" href="#build-plugin" title="Link to this heading"></a></h2>
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<p>The <code class="docutils literal notranslate"><span class="pre">build_plugin</span></code> extends <code class="docutils literal notranslate"><span class="pre">label_plugin</span></code> by also taking care of the docker build command.
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Use this as an one-liner to both build and label your plugin image.</p>
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<p>To build your plugin container image you can use the following command:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>build_plugin<span class="w"> </span>DOCKER_FILE_DIRECTORY<span class="w"> </span><span class="o">[</span>DOCKER_IMAGE_NAME<span class="o">]</span><span class="w"> </span><span class="o">[</span>DOCKER_ARGS<span class="o">]</span>
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</pre></div>
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</div>
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<p>For example:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>build_plugin<span class="w"> </span>.
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</pre></div>
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</div>
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<p>and to pass proxy configurations to Docker:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>build_plugin<span class="w"> </span>.<span class="w"> </span>--build-arg<span class="w"> </span><span class="nv">http_proxy</span><span class="o">=</span><span class="s2">"</span><span class="nv">$http_proxy</span><span class="s2">"</span><span class="w"> </span>--build-arg<span class="w"> </span><span class="nv">https_proxy</span><span class="o">=</span><span class="s2">"</span><span class="nv">$https_proxy</span><span class="s2">"</span>
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</pre></div>
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</div>
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<p>This will generate a plugin image:</p>
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<ul class="simple">
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<li><p>The extraction plugin is added to your local image registry (<code class="docutils literal notranslate"><span class="pre">docker</span> <span class="pre">images</span></code>),</p></li>
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<li><p>Note that the variables <code class="docutils literal notranslate"><span class="pre">$http_proxy</span></code> and <code class="docutils literal notranslate"><span class="pre">$https_proxy</span></code> are put in quotes, this is needed in case they contain
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spaces,</p></li>
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<li><p>The image is tagged with two tags: <code class="docutils literal notranslate"><span class="pre">latest</span></code>, and your plugin version.</p></li>
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</ul>
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<p>Arguments:</p>
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<ul class="simple">
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<li><p><code class="docutils literal notranslate"><span class="pre">DOCKER_FILE_DIRECTORY</span></code>: Path to the directory containing the Dockerfile of the plugin.</p></li>
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<li><p>(Optional) <code class="docutils literal notranslate"><span class="pre">DOCKER\_IMAGE\_NAME</span></code>: Name of the docker image without tag. Note that docker image names cannot start with
|
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a period or dash. If it starts with a dash, it will be interpreted as an additional docker argument (see
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DOCKER_ARGS). If no name is given the name defaults to <code class="docutils literal notranslate"><span class="pre">extraction-plugin/PLUGINID</span></code>, e.g.
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<code class="docutils literal notranslate"><span class="pre">extraction-plugin/nfi.nl/extract/chat/whatsapp</span></code>.</p></li>
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<li><p>(Optional) <code class="docutils literal notranslate"><span class="pre">DOCKER\_ARGS</span></code>: Additional arguments for the docker command, which can be as many arguments as you like.</p></li>
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</ul>
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</section>
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<section id="build-plugin-ci">
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<h2><code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code><a class="headerlink" href="#build-plugin-ci" title="Link to this heading"></a></h2>
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<p>The <code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code> performs the same tasks as <code class="docutils literal notranslate"><span class="pre">build_plugin</span></code> except that it uses a different approach for labeling
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the plugin. Not all CI/CD pipelines allow docker containers to be started and connected to, something which
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<code class="docutils literal notranslate"><span class="pre">build_plugin</span></code> relies on to label the plugin correctly using the plugin info specified in the plugin. <code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code>
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uses another approach which exports the image and then parses the plugin info from this image. This way a container
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does not have to be started. Therefore the advantage of <code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code> is that it can more reliably build plugins on
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CI systems. The downside of this approach is that it is slower than <code class="docutils literal notranslate"><span class="pre">build_plugin</span></code> utility. It is therefore adviced to
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use <code class="docutils literal notranslate"><span class="pre">build_plugin</span></code> when developing locally to speed up the development process and to use <code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code> when
|
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building plugins in CI/CD pipelines.</p>
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<section id="requirements">
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<h3>Requirements<a class="headerlink" href="#requirements" title="Link to this heading"></a></h3>
|
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<p>To build your plugin container image using <code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code> you have to add the following line to your Containerfile
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after you have copied your plugin to the image. <code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code> requires this to find the plugin information.</p>
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<p><span class="raw-html-m2r"><!-- pyml disable-next-line fenced-code-language--></span></p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">RUN</span> <span class="n">plugin_info</span> <span class="s2">"/app/plugin.py"</span>
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</pre></div>
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</div>
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</section>
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<section id="command-usage">
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<h3>Command usage<a class="headerlink" href="#command-usage" title="Link to this heading"></a></h3>
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<p><code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code> can be invoked as follows:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>build_plugin<span class="w"> </span>DOCKER_FILE_DIRECTORY<span class="w"> </span><span class="o">[</span>--target_name<span class="w"> </span>DOCKER_IMAGE_NAME<span class="o">]</span><span class="w"> </span><span class="o">[</span>--build_agent<span class="w"> </span>BUILD_AGENT<span class="o">]</span><span class="w"> </span><span class="o">[</span>BUILD_AGENT_ARGS<span class="o">]</span>
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</pre></div>
|
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</div>
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<p>Other than the options provided by <code class="docutils literal notranslate"><span class="pre">build_plugin</span></code> <code class="docutils literal notranslate"><span class="pre">build_plugin_ci</span></code> also provides a <code class="docutils literal notranslate"><span class="pre">--build_agent</span></code> flag which allows a
|
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user to choose between different build agents to build and label their plugin. Currently only docker, podman and
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buildah are supported. For example:</p>
|
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>build_plugin<span class="w"> </span>.<span class="w"> </span>--target_name<span class="w"> </span>my-image:1.3.5<span class="w"> </span>--build_agent<span class="w"> </span><span class="s2">"podman"</span>
|
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</pre></div>
|
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</div>
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<p>A proxy configurations can be configured as follows:</p>
|
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>build_plugin<span class="w"> </span>.<span class="w"> </span>--build-arg<span class="w"> </span><span class="nv">http_proxy</span><span class="o">=</span><span class="s2">"</span><span class="nv">$http_proxy</span><span class="s2">"</span><span class="w"> </span>--build-arg<span class="w"> </span><span class="nv">https_proxy</span><span class="o">=</span><span class="s2">"</span><span class="nv">$https_proxy</span><span class="s2">"</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>This will generate a plugin image:</p>
|
||
<ul class="simple">
|
||
<li><p>The extraction plugin is added to your local image registry (<code class="docutils literal notranslate"><span class="pre">docker</span> <span class="pre">images</span></code>),</p></li>
|
||
<li><p>Note that the variables <code class="docutils literal notranslate"><span class="pre">$http_proxy</span></code> and <code class="docutils literal notranslate"><span class="pre">$https_proxy</span></code> are put in quotes, this is needed in case they contain
|
||
spaces,</p></li>
|
||
<li><p>The image is tagged with two tags: <code class="docutils literal notranslate"><span class="pre">latest</span></code>, and your plugin version.</p></li>
|
||
</ul>
|
||
<p>Arguments:</p>
|
||
<ul class="simple">
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">DOCKER_FILE_DIRECTORY</span></code>: Path to the directory containing the Dockerfile of the plugin.</p></li>
|
||
<li><p>(Optional) <code class="docutils literal notranslate"><span class="pre">DOCKER\_IMAGE\_NAME</span></code>: Name of the docker image without tag. Note that docker image names cannot start with
|
||
a period or dash. If it starts with a dash, it will be interpreted as an additional docker argument (see
|
||
DOCKER_ARGS). If no name is given the name defaults to <code class="docutils literal notranslate"><span class="pre">extraction-plugin/PLUGINID</span></code>, e.g.
|
||
<code class="docutils literal notranslate"><span class="pre">extraction-plugin/nfi.nl/extract/chat/whatsapp</span></code>.</p></li>
|
||
<li><p>(Optional) <code class="docutils literal notranslate"><span class="pre">BUILD\_AGENT</span></code>: The build agent that should be used to build the plugin. Either docker, podman or buildah.
|
||
Docker is the default.</p></li>
|
||
<li><p>(Optional) <code class="docutils literal notranslate"><span class="pre">BUILD\_AGENT\_ARGS</span></code>: Additional arguments for the buildagent command, which can be as many arguments as
|
||
you like.</p></li>
|
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</ul>
|
||
</section>
|
||
</section>
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