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<h1 id="backend-services">Backend Services<a class="headerlink" href="#backend-services" title="Permanent link">&para;</a></h1>
<p>Shared services provide cross-cutting functionality across the Changemaker Lite platform. These services handle external integrations, background processing, and common operations.</p>
<h2 id="service-architecture">Service Architecture<a class="headerlink" href="#service-architecture" title="Permanent link">&para;</a></h2>
<p>Services are singleton instances that provide:</p>
<ul>
<li>External API integrations (email, geocoding, newsletters)</li>
<li>Background job processing (email queues, geocoding queues)</li>
<li>Caching and data management</li>
<li>Infrastructure operations (Docker, tunneling)</li>
</ul>
<h2 id="core-services">Core Services<a class="headerlink" href="#core-services" title="Permanent link">&para;</a></h2>
<h3 id="email-services">Email Services<a class="headerlink" href="#email-services" title="Permanent link">&para;</a></h3>
<p><strong>Email Service</strong> (<code>email.service.ts</code>)</p>
<ul>
<li>Nodemailer SMTP wrapper</li>
<li>Template processing with variable substitution</li>
<li>Test mode support (MailHog integration)</li>
<li>HTML email generation</li>
<li>Attachment handling</li>
</ul>
<p><strong>Email Queue Service</strong> (<code>email-queue.service.ts</code>)</p>
<ul>
<li>BullMQ queue management</li>
<li>Worker process for async email sending</li>
<li>Job retry logic with exponential backoff</li>
<li>Queue monitoring and statistics</li>
<li>Batch email processing</li>
</ul>
<h3 id="geocoding-services">Geocoding Services<a class="headerlink" href="#geocoding-services" title="Permanent link">&para;</a></h3>
<p><strong>Geocoding Service</strong> (<code>geocoding.service.ts</code>)</p>
<ul>
<li>Multi-provider geocoding (6 providers)</li>
<li>Nominatim (OpenStreetMap)</li>
<li>ArcGIS</li>
<li>Photon</li>
<li>Mapbox</li>
<li>Google Geocoding API</li>
<li>Pelias</li>
<li>Provider fallback chain</li>
<li>Rate limiting per provider</li>
<li>Result caching</li>
<li>Batch geocoding support</li>
</ul>
<p><strong>Geocode Queue Service</strong> (<code>geocode-queue.service.ts</code>)</p>
<ul>
<li>BullMQ queue for async geocoding</li>
<li>Worker process with provider rotation</li>
<li>Progress tracking</li>
<li>Error handling and retry logic</li>
<li>Batch processing optimization</li>
</ul>
<h3 id="integration-services">Integration Services<a class="headerlink" href="#integration-services" title="Permanent link">&para;</a></h3>
<p><strong>Listmonk Client</strong> (<code>listmonk.client.ts</code>)</p>
<ul>
<li>Typed HTTP client for Listmonk REST API</li>
<li>Basic auth integration</li>
<li>List management operations</li>
<li>Subscriber CRUD</li>
<li>Campaign operations</li>
</ul>
<p><strong>Listmonk Sync Service</strong> (<code>listmonk-sync.service.ts</code>)</p>
<ul>
<li>Opt-in sync (controlled by <code>LISTMONK_SYNC_ENABLED</code>)</li>
<li>Participant → subscriber sync</li>
<li>Location → list management</li>
<li>User role → list assignment</li>
<li>Automated sync on campaign actions</li>
</ul>
<p><strong>Pangolin Client</strong> (<code>pangolin.client.ts</code>)</p>
<ul>
<li>Typed HTTP client for Pangolin Integration API</li>
<li>API key authentication</li>
<li>Tunnel management</li>
<li>Site configuration</li>
<li>Resource operations</li>
</ul>
<h3 id="infrastructure-services">Infrastructure Services<a class="headerlink" href="#infrastructure-services" title="Permanent link">&para;</a></h3>
<p><strong>Docker Service</strong> (<code>docker.service.ts</code>)</p>
<ul>
<li>Container lifecycle management</li>
<li>Health check monitoring</li>
<li>Service status queries</li>
<li>Container operations (start, stop, restart)</li>
<li>Resource monitoring</li>
</ul>
<h2 id="service-list">Service List<a class="headerlink" href="#service-list" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th>Service</th>
<th>Purpose</th>
<th>Dependencies</th>
</tr>
</thead>
<tbody>
<tr>
<td>Email Service</td>
<td>SMTP email delivery</td>
<td>Nodemailer</td>
</tr>
<tr>
<td>Email Queue</td>
<td>Async email processing</td>
<td>BullMQ, Redis</td>
</tr>
<tr>
<td>Geocoding</td>
<td>Address → coordinates</td>
<td>Multiple providers</td>
</tr>
<tr>
<td>Geocode Queue</td>
<td>Async geocoding</td>
<td>BullMQ, Redis</td>
</tr>
<tr>
<td>Listmonk Client</td>
<td>Newsletter API</td>
<td>Native fetch</td>
</tr>
<tr>
<td>Listmonk Sync</td>
<td>Automated list sync</td>
<td>Listmonk Client</td>
</tr>
<tr>
<td>Pangolin Client</td>
<td>Tunnel API</td>
<td>Native fetch</td>
</tr>
<tr>
<td>Docker Service</td>
<td>Container ops</td>
<td>Docker API</td>
</tr>
</tbody>
</table>
<h2 id="configuration">Configuration<a class="headerlink" href="#configuration" title="Permanent link">&para;</a></h2>
<p>Services are configured via environment variables in <code>api/src/config/env.ts</code>:</p>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1">// Email</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="nx">EMAIL_TEST_MODE</span><span class="o">=</span><span class="kc">true</span><span class="w"> </span><span class="c1">// Use MailHog instead of SMTP</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="nx">SMTP_HOST</span><span class="o">=</span><span class="nx">smtp</span><span class="p">.</span><span class="nx">example</span><span class="p">.</span><span class="nx">com</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="nx">SMTP_PORT</span><span class="o">=</span><span class="mf">587</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="c1">// Geocoding</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="nx">MAPBOX_ACCESS_TOKEN</span><span class="o">=</span><span class="nx">pk_</span><span class="p">...</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="nx">GOOGLE_GEOCODE_API_KEY</span><span class="o">=</span><span class="p">...</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="c1">// Listmonk</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="nx">LISTMONK_SYNC_ENABLED</span><span class="o">=</span><span class="kc">true</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="nx">LISTMONK_API_URL</span><span class="o">=</span><span class="nx">http</span><span class="o">:</span><span class="c1">//listmonk:9000</span>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="nx">LISTMONK_API_USER</span><span class="o">=</span><span class="nx">api_user</span>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="nx">LISTMONK_API_TOKEN</span><span class="o">=</span><span class="nx">secret</span>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="c1">// Pangolin</span>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="nx">PANGOLIN_API_URL</span><span class="o">=</span><span class="nx">https</span><span class="o">:</span><span class="c1">//api.bnkserve.org/v1</span>
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="nx">PANGOLIN_API_KEY</span><span class="o">=</span><span class="p">...</span>
</span></code></pre></div>
<h2 id="usage-patterns">Usage Patterns<a class="headerlink" href="#usage-patterns" title="Permanent link">&para;</a></h2>
<h3 id="email-service">Email Service<a class="headerlink" href="#email-service" title="Permanent link">&para;</a></h3>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">emailService</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s1">&#39;../services/email.service&#39;</span><span class="p">;</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="k">await</span><span class="w"> </span><span class="nx">emailService</span><span class="p">.</span><span class="nx">sendEmail</span><span class="p">({</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="nx">to</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;user@example.com&#39;</span><span class="p">,</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="nx">subject</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;Welcome&#39;</span><span class="p">,</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="nx">html</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;&lt;p&gt;Welcome to our platform&lt;/p&gt;&#39;</span><span class="p">,</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="p">});</span>
</span></code></pre></div>
<h3 id="email-queue">Email Queue<a class="headerlink" href="#email-queue" title="Permanent link">&para;</a></h3>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">emailQueueService</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s1">&#39;../services/email-queue.service&#39;</span><span class="p">;</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="k">await</span><span class="w"> </span><span class="nx">emailQueueService</span><span class="p">.</span><span class="nx">addEmailJob</span><span class="p">({</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="nx">to</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;user@example.com&#39;</span><span class="p">,</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="nx">subject</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;Campaign Update&#39;</span><span class="p">,</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="nx">template</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;campaign-email&#39;</span><span class="p">,</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="nx">variables</span><span class="o">:</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">campaignName</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;Save the Parks&#39;</span><span class="w"> </span><span class="p">},</span>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="p">});</span>
</span></code></pre></div>
<h3 id="geocoding-service">Geocoding Service<a class="headerlink" href="#geocoding-service" title="Permanent link">&para;</a></h3>
<div class="language-typescript highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">geocodingService</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s1">&#39;../services/geocoding.service&#39;</span><span class="p">;</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="kd">const</span><span class="w"> </span><span class="nx">result</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">geocodingService</span><span class="p">.</span><span class="nx">geocode</span><span class="p">({</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w"> </span><span class="nx">address</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;123 Main St, Toronto, ON&#39;</span><span class="p">,</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="nx">provider</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;nominatim&#39;</span><span class="p">,</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="p">});</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="nx">result</span><span class="p">.</span><span class="nx">success</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="w"> </span><span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">result</span><span class="p">.</span><span class="nx">coordinates</span><span class="p">);</span><span class="w"> </span><span class="c1">// { lat: 43.65, lng: -79.38 }</span>
</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="p">}</span>
</span></code></pre></div>
<h2 id="related-documentation">Related Documentation<a class="headerlink" href="#related-documentation" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="../">Backend Overview</a></li>
<li><a href="../modules/">Modules</a></li>
<li><a href="../../deployment/environment-variables/">Environment Variables</a></li>
<li><a href="../../features/influence/email-queue/">Email Queue Feature</a></li>
<li><a href="../../features/map/geocoding/">Geocoding Feature</a></li>
<li><a href="../../features/newsletter/">Newsletter Integration</a></li>
</ul>
</article>
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