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CompactBlockDownloading Protocol Reference
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<article class="main-content">
<section>
<section class="section">
<h1>CompactBlockDownloading</h1>
<div class="declaration">
<div class="language">
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">CompactBlockDownloading</span></code></pre>
</div>
</div>
<p>Represents what a compact block downloaded should provide to its clients</p>
</section>
<section class="section task-group-section">
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/s:19ZcashLightClientKit23CompactBlockDownloadingP08downloadF5Range_10completionySNySiG_ys5Error_pSgctF"></a>
<a name="//apple_ref/swift/Method/downloadBlockRange(_:completion:)" class="dashAnchor"></a>
<a class="token" href="#/s:19ZcashLightClientKit23CompactBlockDownloadingP08downloadF5Range_10completionySNySiG_ys5Error_pSgctF">downloadBlockRange(_:completion:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
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<div class="pointer"></div>
<div class="abstract">
<p>Downloads and stores the given block range.
Non-Blocking</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">downloadBlockRange</span><span class="p">(</span><span class="n">_</span> <span class="nv">heightRange</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:19ZcashLightClientKit17CompactBlockRangea">CompactBlockRange</a></span><span class="p">,</span> <span class="nv">completion</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Error</span><span class="p">?)</span> <span class="o">-&gt;</span> <span class="kt">Void</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:19ZcashLightClientKit23CompactBlockDownloadingP6rewind2to10completionySi_ys5Error_pSgctF"></a>
<a name="//apple_ref/swift/Method/rewind(to:completion:)" class="dashAnchor"></a>
<a class="token" href="#/s:19ZcashLightClientKit23CompactBlockDownloadingP6rewind2to10completionySi_ys5Error_pSgctF">rewind(to:completion:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Remove newer blocks and go back to the given height</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">rewind</span><span class="p">(</span><span class="n">to</span> <span class="nv">height</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:19ZcashLightClientKit11BlockHeighta">BlockHeight</a></span><span class="p">,</span> <span class="nv">completion</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Error</span><span class="p">?)</span> <span class="o">-&gt;</span> <span class="kt">Void</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>height</em>
</code>
</td>
<td>
<div>
<p>the given height to rewind to</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>completion</em>
</code>
</td>
<td>
<div>
<p>block to be executed after completing rewind</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:19ZcashLightClientKit23CompactBlockDownloadingP014lastDownloadedF6Height6resultyys6ResultOySis5Error_pGc_tF"></a>
<a name="//apple_ref/swift/Method/lastDownloadedBlockHeight(result:)" class="dashAnchor"></a>
<a class="token" href="#/s:19ZcashLightClientKit23CompactBlockDownloadingP014lastDownloadedF6Height6resultyys6ResultOySis5Error_pGc_tF">lastDownloadedBlockHeight(result:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>returns the height of the latest compact block stored locally
BlockHeight.empty() if no blocks are stored yet
non-blocking</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">lastDownloadedBlockHeight</span><span class="p">(</span><span class="nv">result</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Result</span><span class="o">&lt;</span><span class="kt"><a href="../Typealiases.html#/s:19ZcashLightClientKit11BlockHeighta">BlockHeight</a></span><span class="p">,</span> <span class="kt">Error</span><span class="o">&gt;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Void</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:19ZcashLightClientKit23CompactBlockDownloadingP06latestF6Height6resultyys6ResultOySis5Error_pGc_tF"></a>
<a name="//apple_ref/swift/Method/latestBlockHeight(result:)" class="dashAnchor"></a>
<a class="token" href="#/s:19ZcashLightClientKit23CompactBlockDownloadingP06latestF6Height6resultyys6ResultOySis5Error_pGc_tF">latestBlockHeight(result:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the last height on the blockchain
Non-blocking</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">latestBlockHeight</span><span class="p">(</span><span class="nv">result</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Result</span><span class="o">&lt;</span><span class="kt"><a href="../Typealiases.html#/s:19ZcashLightClientKit11BlockHeighta">BlockHeight</a></span><span class="p">,</span> <span class="kt">Error</span><span class="o">&gt;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Void</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:19ZcashLightClientKit23CompactBlockDownloadingP08downloadF5RangeyySNySiGKF"></a>
<a name="//apple_ref/swift/Method/downloadBlockRange(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:19ZcashLightClientKit23CompactBlockDownloadingP08downloadF5RangeyySNySiGKF">downloadBlockRange(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Downloads and stores the given block range.
Blocking</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">downloadBlockRange</span><span class="p">(</span><span class="n">_</span> <span class="nv">range</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:19ZcashLightClientKit17CompactBlockRangea">CompactBlockRange</a></span><span class="p">)</span> <span class="k">throws</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:19ZcashLightClientKit23CompactBlockDownloadingP6rewind2toySi_tKF"></a>
<a name="//apple_ref/swift/Method/rewind(to:)" class="dashAnchor"></a>
<a class="token" href="#/s:19ZcashLightClientKit23CompactBlockDownloadingP6rewind2toySi_tKF">rewind(to:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Restore the download progress up to the given height.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">rewind</span><span class="p">(</span><span class="n">to</span> <span class="nv">height</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:19ZcashLightClientKit11BlockHeighta">BlockHeight</a></span><span class="p">)</span> <span class="k">throws</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:19ZcashLightClientKit23CompactBlockDownloadingP014lastDownloadedF6HeightSiyKF"></a>
<a name="//apple_ref/swift/Method/lastDownloadedBlockHeight()" class="dashAnchor"></a>
<a class="token" href="#/s:19ZcashLightClientKit23CompactBlockDownloadingP014lastDownloadedF6HeightSiyKF">lastDownloadedBlockHeight()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>returns the height of the latest compact block stored locally.
BlockHeight.empty() if no blocks are stored yet
Blocking</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">lastDownloadedBlockHeight</span><span class="p">()</span> <span class="k">throws</span> <span class="o">-&gt;</span> <span class="kt"><a href="../Typealiases.html#/s:19ZcashLightClientKit11BlockHeighta">BlockHeight</a></span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:19ZcashLightClientKit23CompactBlockDownloadingP06latestF6HeightSiyKF"></a>
<a name="//apple_ref/swift/Method/latestBlockHeight()" class="dashAnchor"></a>
<a class="token" href="#/s:19ZcashLightClientKit23CompactBlockDownloadingP06latestF6HeightSiyKF">latestBlockHeight()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the latest block height
Blocking</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">latestBlockHeight</span><span class="p">()</span> <span class="k">throws</span> <span class="o">-&gt;</span> <span class="kt"><a href="../Typealiases.html#/s:19ZcashLightClientKit11BlockHeighta">BlockHeight</a></span></code></pre>
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