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<div class="section" id="client-rpc-api">
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<h1>Client RPC API<a class="headerlink" href="#client-rpc-api" title="Permalink to this headline">¶</a></h1>
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<p>In this tutorial we will build a simple command line utility that connects to a node and dumps the transaction graph to
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the standard output. We will then put some simple visualisation on top. For an explanation on how the RPC works see
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<a class="reference internal" href="clientrpc.html"><span class="doc">Client RPC</span></a>.</p>
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<p>We start off by connecting to the node itself. For the purposes of the tutorial we will run the Trader demo on some
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local port and connect to the Buyer side. We will pass in the address as a command line argument. To connect to the node
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we also need to access the certificates of the node, we will access the node’s <code class="docutils literal"><span class="pre">certificates</span></code> directory directly.</p>
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<p>Now we can connect to the node itself using a valid RPC login. By default the user <cite>user1</cite> is available with password <cite>test</cite>.</p>
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<p><code class="docutils literal"><span class="pre">proxy</span></code> now exposes the full RPC interface of the node:</p>
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<p>The one we need in order to dump the transaction graph is <code class="docutils literal"><span class="pre">verifiedTransactions</span></code>. The type signature tells us that the
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RPC will return a list of transactions and an Observable stream. This is a general pattern, we query some data and the
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node will return the current snapshot and future updates done to it.</p>
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<p>The graph will be defined by nodes and edges between them. Each node represents a transaction and edges represent
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output-input relations. For now let’s just print <code class="docutils literal"><span class="pre">NODE</span> <span class="pre"><txhash></span></code> for the former and <code class="docutils literal"><span class="pre">EDGE</span> <span class="pre"><txhash></span> <span class="pre"><txhash></span></code> for the
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latter.</p>
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<p>Now we can start the trader demo as per described in <a class="reference internal" href="running-the-demos.html"><span class="doc">Running the demos</span></a>:</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span># Build the demo
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./gradlew installDist
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# Start the buyer
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./build/install/r3prototyping/bin/trader-demo --role=BUYER
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</pre></div>
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</div>
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<p>In another terminal we can connect to it with our client:</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span># Connect to localhost:31337
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./docs/source/example-code/build/install/docs/source/example-code/bin/client-rpc-tutorial localhost:31337 Print
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</pre></div>
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</div>
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<p>We should see some <code class="docutils literal"><span class="pre">NODE</span></code>-s printed. This is because the buyer self-issues some cash for the demo.
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Unless we ran the seller before we shouldn’t see any <code class="docutils literal"><span class="pre">EDGE</span></code>-s because the cash hasn’t been spent yet.</p>
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<p>In another terminal we can now start the seller:</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span># Start sellers in a loop
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for i in {0..9} ; do ./build/install/r3prototyping/bin/trader-demo --role=SELLER ; done
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</pre></div>
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</div>
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<p>We should start seeing new <code class="docutils literal"><span class="pre">NODE</span></code>-s and <code class="docutils literal"><span class="pre">EDGE</span></code>-s appearing.</p>
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<p>Now let’s try to visualise the transaction graph. We will use a graph drawing library called <a class="reference external" href="http://graphstream-project.org/">graphstream</a></p>
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<p>If we run the client with <code class="docutils literal"><span class="pre">Visualise</span></code> we should see a simple graph being drawn as new transactions are being created
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by the seller runs.</p>
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<p>That’s it! We saw how to connect to the node and stream data from it.</p>
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