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<h5>Reference</h5>
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<div class="uk-width-1-1 uk-width-expand@m">
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<article markdown="span" class="uk-article">
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<h1 class="uk-article-title">How to Use the Atlas Network</h1>
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<div class="uk-article-meta uk-margin-top uk-margin-medium-bottom">
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<!-- Written by <span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name">Blockstack</span></span><br> -->
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<time datetime="2018-09-13T13:13:37-07:00" itemprop="datePublished">
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<a "target="_blank" href="https://github.com/blockstack/blockstack-core/blob/master/docs/howtouse.md" class="btn btn-default githubEditButton" role="button">
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<span data-uk-icon="icon: pencil; ratio: 1.2"></span> Edit this page on Github</a>
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<span style="font-family:Wingdings">w</span> Sep 13, 2018
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</time>
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</div>
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<div markdown="span" class="article-content">
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<p class="no_toc">This section teaches you how to use the Atlas network, it contains the
|
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following sections:</p>
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<ul id="markdown-toc">
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<li><a href="#the-api" id="markdown-toc-the-api">The API</a></li>
|
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<li><a href="#looking-up-chunks" id="markdown-toc-looking-up-chunks">Looking up Chunks</a></li>
|
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<li><a href="#adding-a-new-chunk" id="markdown-toc-adding-a-new-chunk">Adding a New Chunk</a></li>
|
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<li><a href="#propagating-chunks" id="markdown-toc-propagating-chunks">Propagating Chunks</a></li>
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</ul>
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<h2 id="the-api">The API</h2>
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<p>While the Blockstack software stack expects that Atlas-hosted data is made up of
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DNS zone files, Atlas itself does not enforce this (nor does it care about the
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format of its chunks). It is designed as a general-purpose chunk store.
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Nevertheless, the ubiquitous use of Atlas to store data as DNS zone files has
|
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had an influence on its API design—fields and method names frequently allude
|
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to zone files and zone file hashes. This is intentional.</p>
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<p>The <a href="https://core.blockstack.org">public BNS API endpoint</a> does not support
|
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resolving Atlas chunks that do not encode Gaia routing information or subdomain
|
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information. To directly interact with Atlas, developers will need to install
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<a href="https://github.com/blockstack/blockstack-core">Blockstack Core</a> and use its
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Python client libraries for these examples.</p>
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<h2 id="looking-up-chunks">Looking up Chunks</h2>
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<p>All Atlas chunks are addressed by the RIPEMD160 hash of the SHA256 hash of the
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|
chunk data. A client can query up to 100 chunks in one RPC call.</p>
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|
<p>A client can look up a chunk with the <code class="highlighter-rouge">get_zonefiles()</code> method. If successful,
|
|
the returned payload will be a <code class="highlighter-rouge">dict</code> with a <code class="highlighter-rouge">zonefiles</code> key that maps the chunk
|
|
hashes to their respective data.</p>
|
|
|
|
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="o">>>></span> <span class="kn">import</span> <span class="nn">blockstack</span>
|
|
<span class="o">>>></span> <span class="n">data</span> <span class="o">=</span> <span class="n">blockstack</span><span class="o">.</span><span class="n">lib</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">get_zonefiles</span><span class="p">(</span><span class="s">'https://node.blockstack.org:6263'</span><span class="p">,</span> <span class="p">[</span><span class="s">'1b89a685f4c4ea245ce9433d0b29166c22175ab4'</span><span class="p">])</span>
|
|
<span class="o">>>></span> <span class="k">print</span> <span class="n">data</span><span class="p">[</span><span class="s">'zonefiles'</span><span class="p">][</span><span class="s">'1b89a685f4c4ea245ce9433d0b29166c22175ab4'</span><span class="p">]</span>
|
|
<span class="err">$</span><span class="n">ORIGIN</span> <span class="n">duckduckgo_tor</span><span class="o">.</span><span class="nb">id</span>
|
|
<span class="err">$</span><span class="n">TTL</span> <span class="mi">3600</span>
|
|
<span class="n">tor</span> <span class="n">TXT</span> <span class="s">"3g2upl4pq6kufc4m.onion"</span>
|
|
|
|
<span class="o">>>></span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<p>(This particular chunk happens to be associated with the BNS name
|
|
<code class="highlighter-rouge">duckduckgo_tor.id</code>).</p>
|
|
|
|
<h2 id="adding-a-new-chunk">Adding a New Chunk</h2>
|
|
|
|
<p>The only way to add a chunk to Atlas is to do so through an on-chain name in
|
|
BNS. Adding a new chunk is a two-step process:</p>
|
|
|
|
<ul>
|
|
<li>The name owner announces the chunk hash as a name’s state
|
|
via a <code class="highlighter-rouge">NAME_REGISTRATION</code>, <code class="highlighter-rouge">NAME_UPDATE</code>, <code class="highlighter-rouge">NAME_RENEWAL</code>, or <code class="highlighter-rouge">NAME_IMPORT</code> transaction.</li>
|
|
<li>Once the transaction is confirmed and processed by BNS, the name owner
|
|
broadcasts the matching zone file.</li>
|
|
</ul>
|
|
|
|
<p>Setting a name’s state to be the hash of a chunk is beyond the scope of this
|
|
document, since it needs to be done through a BNS client.
|
|
See the relevant documentation for
|
|
<a href="https://github.com/blockstack/blockstack.js">blockstack.js</a> and the <a href="https://github.com/blockstack/blockstack-browser">Blockstack
|
|
Browser</a> for doing this.</p>
|
|
|
|
<p>Once the name operation is confirmed, you can announce the data to the
|
|
Atlas network. You can do so with the Python client as follows:</p>
|
|
|
|
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="o">>>></span> <span class="kn">import</span> <span class="nn">blockstack</span>
|
|
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">base64</span>
|
|
<span class="o">>>></span> <span class="n">data</span> <span class="o">=</span> <span class="s">"..."</span> <span class="c"># this is the chunk data you will announce</span>
|
|
<span class="o">>>></span> <span class="n">data_b64</span> <span class="o">=</span> <span class="n">base64</span><span class="o">.</span><span class="n">b64encode</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
|
|
<span class="o">>>></span> <span class="n">result</span> <span class="o">=</span> <span class="n">blockstack</span><span class="o">.</span><span class="n">lib</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">put_zonefiles</span><span class="p">(</span><span class="s">'https://node.blockstack.org:6263'</span><span class="p">,</span> <span class="p">[</span><span class="n">data_b64</span><span class="p">])</span>
|
|
<span class="o">>>></span> <span class="k">assert</span> <span class="n">result</span><span class="p">[</span><span class="s">'saved'</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="mi">1</span>
|
|
<span class="o">>>></span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<p>At most five chunks can be announced in one RPC call.
|
|
Note that the data must be base64-encoded before it can be announced.</p>
|
|
|
|
<p>When the <code class="highlighter-rouge">put_zonefiles()</code> method succeeds, it returns a <code class="highlighter-rouge">dict</code> with a list
|
|
under the <code class="highlighter-rouge">saved</code> key. Here, <code class="highlighter-rouge">result['saved'][i]</code> will be 1 if the <code class="highlighter-rouge">i</code>th
|
|
chunk given to <code class="highlighter-rouge">put_zonefiles()</code> was saved by the node, and 0 if not.
|
|
The node will not save a chunk if it is too big, or if it has not yet processed
|
|
the name operation that contained the chunk’s hash.</p>
|
|
|
|
<p>The <code class="highlighter-rouge">put_zonefiles()</code> method is idempotent.</p>
|
|
|
|
<h2 id="propagating-chunks">Propagating Chunks</h2>
|
|
|
|
<p>Atlas peers will each store a copy of the chunks you announce. In the
|
|
background, they will asynchronously announce to one another which chunks they
|
|
have available, and replicate them to one another in a rarest-first order (much
|
|
like how BitTorrent works). Eventually, every Atlas peer will receive the
|
|
chunk.</p>
|
|
|
|
<p>However, developers can accelerate this process by eagerly propagating chunks.
|
|
To do so, they can ask an Atlas peer for its immediate neighbors in the Atlas
|
|
peer graph, and replicate the chunk to each of them as well.</p>
|
|
|
|
<p>For example, this code will replicate the chunk to not only
|
|
<code class="highlighter-rouge">https://node.blockstack.org:6263</code>, but also to its immediate neighbors.</p>
|
|
|
|
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="o">>>></span> <span class="kn">import</span> <span class="nn">blockstack</span>
|
|
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">base64</span>
|
|
<span class="o">>>></span> <span class="n">data</span> <span class="o">=</span> <span class="s">"..."</span> <span class="c"># this is the chunk you will replicate widely</span>
|
|
<span class="o">>>></span> <span class="n">data_b64</span> <span class="o">=</span> <span class="n">base64</span><span class="o">.</span><span class="n">b64encode</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
|
|
<span class="o">>>></span>
|
|
<span class="o">>>></span> <span class="n">result</span> <span class="o">=</span> <span class="n">blockstack</span><span class="o">.</span><span class="n">lib</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">get_atlas_peers</span><span class="p">(</span><span class="s">'https://node.blockstack.org:6263'</span><span class="p">)</span>
|
|
<span class="o">>>></span> <span class="n">neighbors</span> <span class="o">=</span> <span class="n">result</span><span class="p">[</span><span class="s">'peers'</span><span class="p">]</span>
|
|
<span class="o">>>></span> <span class="k">print</span> <span class="s">", "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">neighbors</span><span class="p">)</span>
|
|
<span class="mf">13.65</span><span class="o">.</span><span class="mf">207.163</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">52.225</span><span class="o">.</span><span class="mf">128.191</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="n">node</span><span class="o">.</span><span class="n">blockstack</span><span class="o">.</span><span class="n">org</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">23.102</span><span class="o">.</span><span class="mf">162.7</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">52.167</span><span class="o">.</span><span class="mf">230.235</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">23.102</span><span class="o">.</span><span class="mf">162.124</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">52.151</span><span class="o">.</span><span class="mf">59.26</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">13.92</span><span class="o">.</span><span class="mf">134.106</span><span class="p">:</span><span class="mi">6264</span>
|
|
<span class="o">>>></span>
|
|
<span class="o">>>></span> <span class="k">for</span> <span class="n">neighbor</span> <span class="ow">in</span> <span class="n">neighbors</span><span class="p">:</span>
|
|
<span class="o">...</span> <span class="n">result</span> <span class="o">=</span> <span class="n">blockstack</span><span class="o">.</span><span class="n">lib</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">put_zonefiles</span><span class="p">(</span><span class="n">neighbor</span><span class="p">,</span> <span class="p">[</span><span class="n">data_b64</span><span class="p">])</span>
|
|
<span class="o">...</span> <span class="k">assert</span> <span class="n">result</span><span class="p">[</span><span class="s">'saved'</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="mi">1</span>
|
|
<span class="o">...</span>
|
|
<span class="o">>>></span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<p>This is not strictly necessary, but it does help accelerate chunk replication
|
|
and makes it less likely that a chunk will get lost due to individual node
|
|
failures.</p>
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<script type="text/javascript">
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/* Create a configuration object */
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var ss360Config = {
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/* Your site id */
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siteId: 'blockstack',
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/* A CSS selector that points to your search box */
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searchBox: {
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selector: '#searchBox'
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},
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results: {
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embedConfig: undefined, // {'url':undefined,'contentBlock':'.page-content-body'}, // if url is given the page will change to that URL and look for the content block there to insert the results
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fullScreenConfig: undefined, // {trigger: '#ss360-search-trigger', caption: 'Search this site'}, trigger is the CSS selector to the element that starts the search full screen overlay and searchCaption the caption on the full screen search page
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caption: 'Found #COUNT# search results for \"#QUERY#\"', // the caption of the search results
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group: true, // whether results should be grouped if content groups are available
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filters: undefined,
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num: 96, // the maximum number of search results to be shown
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highlightQueryTerms: true, // whether to highlight the query terms in search results
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moreResultsButton: "Show more results", // HTML for the more results button, all results will be shown if this is null
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noResultsText: 'Sorry, we have not found any matches for your query.', // the text to show when there are no results
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queryCorrectionText: 'Did you mean "#CORRECTION#"?',
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searchQueryParamName: 'ss360Query', // the name of the search query parameter
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linksOpenNewTab: false, // should clicking on the result links open a new tab/window?
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showSearchBoxLayover: true, //whether to show search box in search result layover
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moreResultsPagingSize: 12, // the number of new results to show each time the more results button is pressed (max: 24)
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orderByRelevanceText: "Relevance" // the text to be shown in order select box to describe 'order by relevance' option
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},
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suggestions: {
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show: true, // whether to show search suggestions
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maxQuerySuggestions: 3, // the maximum number of query suggestions
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querySuggestionHeadline: undefined, // the headline of the query suggestions, leave blank if no headline should be shown
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emptyQuerySuggestions: undefined,
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showImages: false, // show images in search suggestions
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num: 6, // the maximum number of search suggestions to be shown
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minChars: 3, // minimum number of characters before the suggestions shows, default: 3,
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maxWidth: 'auto', // the maximum width of the suggest box, default: as wide as the input box, at least 275px
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throttleTime: 300, // the number of milliseconds before the suggest is triggered after finished input, default: 300ms
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extraHtml: undefined, // extra HTML code that is shown in each search suggest, you can even show values of datapoints here,
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highlight: true, // whether matched words should be highlighted, default: true
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}
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};
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</script>
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<script src="https://cdn.sitesearch360.com/sitesearch360-v11.min.js" async></script>
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</body>
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</html>
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