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<li class="toctree-l3"><a class="reference internal" href="#constants">Constants</a></li>
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<div class="section" id="migration-guides">
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<span id="migration"></span><h1>Migration Guides<a class="headerlink" href="#migration-guides" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="migrating-from-web3-to-ethers-v4">
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<h2>Migrating from Web3 to ethers v4<a class="headerlink" href="#migrating-from-web3-to-ethers-v4" title="Permalink to this headline">¶</a></h2>
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<p>Todo: This is coming soon.</p>
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</div>
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<hr class="docutils" />
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<div class="section" id="migrating-from-ethers-v3-to-ethers-v4">
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<h2>Migrating from ethers v3 to ethers v4<a class="headerlink" href="#migrating-from-ethers-v3-to-ethers-v4" title="Permalink to this headline">¶</a></h2>
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<p>A lot of the functionality has remained the same, but there has been some
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slight refactoring and improved paradigms.</p>
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<hr class="docutils" />
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<div class="section" id="constants">
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<h3>Constants<a class="headerlink" href="#constants" title="Permalink to this headline">¶</a></h3>
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<p>All constants have moved from the utils to the root ethers object.</p>
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<div class="literal-block-wrapper docutils container" id="id1">
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<div class="code-block-caption"><span class="caption-text"><em>Constants — ethers v3</em></span><a class="headerlink" href="#id1" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">one</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">constants</span><span class="p">.</span><span class="nx">One</span><span class="p">;</span>
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</pre></div>
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</div>
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</div>
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<div class="literal-block-wrapper docutils container" id="id2">
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<div class="code-block-caption"><span class="caption-text"><em>Constants — ethers v4</em></span><a class="headerlink" href="#id2" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">one</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">constants</span><span class="p">.</span><span class="nx">One</span><span class="p">;</span>
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</pre></div>
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</div>
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</div>
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</div>
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<hr class="docutils" />
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<div class="section" id="deploying-contracts">
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<h3>Deploying Contracts<a class="headerlink" href="#deploying-contracts" title="Permalink to this headline">¶</a></h3>
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<p>Deploying contracts has undergone some significant change. The new API is more
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seamless and reduces the amount of low-level understanding that is required,
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such as the details of how <em>init transaction</em> behave.</p>
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<p>More complex and complete objects are also returned through-out the
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process, so there are far less calls to utility functions after a deployment
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required to populate databases and track status.</p>
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<div class="literal-block-wrapper docutils container" id="id3">
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<div class="code-block-caption"><span class="caption-text"><em>ethers v3</em></span><a class="headerlink" href="#id3" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">tx</span> <span class="o">=</span> <span class="nx">Contract</span><span class="p">.</span><span class="nx">getDeployTransaction</span><span class="p">(</span><span class="nx">bytecode</span><span class="p">,</span> <span class="nx">abi</span><span class="p">,</span> <span class="nx">arg1</span><span class="p">,</span> <span class="nx">arg2</span><span class="p">);</span>
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<span class="c1">// overrides</span>
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<span class="nx">tx</span><span class="p">.</span><span class="nx">gasLimit</span> <span class="o">=</span> <span class="mi">1500000</span><span class="p">;</span>
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<span class="nx">wallet</span><span class="p">.</span><span class="nx">sendTransaction</span><span class="p">(</span><span class="nx">tx</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">tx</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="kd">let</span> <span class="nx">contractAddress</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">getContractAddress</span><span class="p">(</span><span class="nx">tx</span><span class="p">);</span>
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<span class="kd">let</span> <span class="nx">contract</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">Contract</span><span class="p">(</span><span class="nx">contractAddress</span><span class="p">,</span> <span class="nx">abi</span><span class="p">,</span> <span class="nx">wallet</span><span class="p">);</span>
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<span class="nx">provider</span><span class="p">.</span><span class="nx">waitForTransaction</span><span class="p">(</span><span class="nx">tx</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">tx</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="nx">provider</span><span class="p">.</span><span class="nx">getTransactionReceipt</span><span class="p">(</span><span class="nx">tx</span><span class="p">.</span><span class="nx">hash</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">receipt</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="nx">receipt</span><span class="p">.</span><span class="nx">status</span> <span class="o">===</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">throw</span> <span class="k">new</span> <span class="nb">Error</span><span class="p">(</span><span class="s1">'failed to deploy'</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="nx">contract</span><span class="p">.</span><span class="nx">someFunction</span><span class="p">();</span>
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<span class="p">});</span>
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<span class="p">});</span>
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<span class="p">});</span>
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</pre></div>
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</div>
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</div>
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<div class="literal-block-wrapper docutils container" id="id4">
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<div class="code-block-caption"><span class="caption-text"><em>Deploy a Contract — ethers v4</em></span><a class="headerlink" href="#id4" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Construct a Contract Factory</span>
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<span class="kd">let</span> <span class="nx">factory</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">ContractFactory</span><span class="p">(</span><span class="nx">abi</span><span class="p">,</span> <span class="nx">bytecode</span><span class="p">,</span> <span class="nx">signer</span><span class="p">);</span>
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<span class="c1">// Deploy automatically detects gasLimit and all other parameters</span>
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<span class="c1">// Overrides can optionally be passed as an extra parameter</span>
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<span class="c1">// Optional; all unspecified values will queried from the network</span>
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<span class="kd">let</span> <span class="nx">overrides</span> <span class="o">=</span> <span class="p">{</span> <span class="p">};</span>
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<span class="nx">factory</span><span class="p">.</span><span class="nx">deploy</span><span class="p">(</span><span class="nx">arg1</span><span class="p">,</span> <span class="nx">arg2</span><span class="p">,</span> <span class="nx">overrides</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">contract</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="c1">// The contract is returned immediately; it has not been mined yet</span>
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<span class="c1">// The contract known its address (before it is even mined)</span>
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<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">contract</span><span class="p">.</span><span class="nx">address</span><span class="p">);</span>
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<span class="c1">// You can access the in-flight transaction that is currently waiting to be mined</span>
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<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">contract</span><span class="p">.</span><span class="nx">deployTransaction</span><span class="p">);</span>
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<span class="c1">// A full transaction with:</span>
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<span class="c1">// - from</span>
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<span class="c1">// - nonce</span>
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<span class="c1">// - hash</span>
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<span class="c1">// - all other Transaction Response fields</span>
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<span class="c1">// - wait() => Promise that resolves to the TransactionReceipt</span>
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<span class="c1">// The "deployed()" function will return a Promise that resolves</span>
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<span class="c1">// to the contract, once it has been mined. If the contract fails</span>
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<span class="c1">// to deploy, the Promise will reject.</span>
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<span class="nx">contract</span><span class="p">.</span><span class="nx">deployed</span><span class="p">().</span><span class="nx">then</span><span class="p">((</span><span class="nx">contract</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="c1">// The contract is now deployed</span>
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<span class="nx">contract</span><span class="p">.</span><span class="nx">someFunction</span><span class="p">();</span>
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<span class="p">},</span> <span class="p">(</span><span class="nx">error</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="c1">// The transaction failed to deploy</span>
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<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">'Failed to deploy in TX:'</span><span class="p">,</span> <span class="nx">error</span><span class="p">.</span><span class="nx">transactionHash</span><span class="p">);</span>
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<span class="p">});</span>
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<span class="p">});</span>
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</pre></div>
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</div>
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</div>
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<div class="literal-block-wrapper docutils container" id="id5">
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<div class="code-block-caption"><span class="caption-text"><em>Deploy a Contract with async/await — ethers v4</em></span><a class="headerlink" href="#id5" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="nx">async</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="kd">let</span> <span class="nx">factory</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">ContractFactory</span><span class="p">(</span><span class="nx">abi</span><span class="p">,</span> <span class="nx">bytecode</span><span class="p">,</span> <span class="nx">signer</span><span class="p">);</span>
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<span class="kd">let</span> <span class="nx">contract</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">factory</span><span class="p">.</span><span class="nx">deploy</span><span class="p">(</span><span class="nx">arg1</span><span class="p">,</span> <span class="nx">arg2</span><span class="p">);</span>
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<span class="k">try</span> <span class="p">{</span>
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<span class="nx">await</span> <span class="nx">contract</span><span class="p">.</span><span class="nx">deployed</span><span class="p">();</span>
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<span class="p">}</span> <span class="k">catch</span> <span class="p">(</span><span class="nx">error</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s1">'Failed to deploy in TX:'</span><span class="p">,</span> <span class="nx">error</span><span class="p">.</span><span class="nx">transactionHash</span><span class="p">);</span>
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<span class="k">throw</span> <span class="nx">error</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="nx">contract</span><span class="p">.</span><span class="nx">someFunction</span><span class="p">();</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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</div>
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<div class="literal-block-wrapper docutils container" id="id6">
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<div class="code-block-caption"><span class="caption-text"><em>Get Deployment Transaction — ethers v4</em></span><a class="headerlink" href="#id6" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// If you still need the deployment transaction, and don't wish to</span>
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<span class="c1">// actually deploy, you can much more easily just use the Interface</span>
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<span class="c1">// object without the need for a provider or signer.</span>
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<span class="kd">let</span> <span class="nx">factory</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">ContractFactory</span><span class="p">(</span><span class="nx">abi</span><span class="p">,</span> <span class="nx">bytecode</span><span class="p">);</span>
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<span class="kd">let</span> <span class="nx">tx</span> <span class="o">=</span> <span class="nx">factory</span><span class="p">.</span><span class="nx">getDeployTransaction</span><span class="p">(</span><span class="nx">arg1</span><span class="p">,</span> <span class="nx">arg2</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="encrypted-wallets">
|
|
<h3>Encrypted Wallets<a class="headerlink" href="#encrypted-wallets" title="Permalink to this headline">¶</a></h3>
|
|
<div class="literal-block-wrapper docutils container" id="id7">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Checking JSON Wallets — ethers v3</em></span><a class="headerlink" href="#id7" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">isJsonWallet</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">Wallet</span><span class="p">.</span><span class="nx">isEncryptedWallet</span><span class="p">(</span><span class="nx">json</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id8">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Checking JSON Wallets — ethers v4</em></span><a class="headerlink" href="#id8" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">address</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">getJsonWalletAddress</span><span class="p">(</span><span class="nx">json</span><span class="p">);</span>
|
|
<span class="kd">let</span> <span class="nx">isJsonWallet</span> <span class="o">=</span> <span class="p">(</span><span class="nx">address</span> <span class="o">!==</span> <span class="kc">null</span><span class="p">)</span>
|
|
</pre></div>
|
|
</div>
|
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</div>
|
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<div class="literal-block-wrapper docutils container" id="id9">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Decrypting JSON Wallets — ethers v3</em></span><a class="headerlink" href="#id9" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">wallet</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">Wallet</span><span class="p">.</span><span class="nx">fromEncryptedWallet</span><span class="p">(</span><span class="nx">json</span><span class="p">,</span> <span class="nx">password</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id10">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Decrypting JSON Wallets — ethers v4</em></span><a class="headerlink" href="#id10" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">wallet</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">Wallet</span><span class="p">.</span><span class="nx">fromEncryptedJson</span><span class="p">(</span><span class="nx">json</span><span class="p">,</span> <span class="nx">password</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="events">
|
|
<h3>Events<a class="headerlink" href="#events" title="Permalink to this headline">¶</a></h3>
|
|
<p>Events now behave like a modern JavaScript Event Emitter, rather than a 1995
|
|
web browser.</p>
|
|
<p>The events now play nicer with the arrow operator (i.e. <code class="docutils literal notranslate"><span class="pre">()</span> <span class="pre">=></span> <span class="pre">{</span> <span class="pre">...</span> <span class="pre">}</span></code>),
|
|
since rather than modifying the <cite>this</cite> inside the callbacks, an additional
|
|
rich object is passed along.</p>
|
|
<div class="literal-block-wrapper docutils container" id="id11">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Events — ethers v3</em></span><a class="headerlink" href="#id11" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Solidity: event SomeEvent(address foo, uint256 bar)</span>
|
|
<span class="nx">contract</span><span class="p">.</span><span class="nx">onsomeevent</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">foo</span><span class="p">,</span> <span class="nx">bar</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">foo</span><span class="p">,</span> <span class="nx">bar</span><span class="p">);</span>
|
|
<span class="c1">// The Log was available at this:</span>
|
|
<span class="c1">// - this.event</span>
|
|
<span class="c1">// - this.removeListener()</span>
|
|
<span class="p">};</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id12">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Listening to an Event — ethers v4</em></span><a class="headerlink" href="#id12" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Solidity: event SomeEvent(address foo, uint256 bar)</span>
|
|
<span class="nx">contract</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="s1">'SomeEvent'</span><span class="p">,</span> <span class="p">(</span><span class="nx">foo</span><span class="p">,</span> <span class="nx">bar</span><span class="p">,</span> <span class="nx">eventInfo</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
|
|
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">foo</span><span class="p">,</span> <span class="nx">bar</span><span class="p">);</span>
|
|
<span class="c1">// eventInfo</span>
|
|
<span class="c1">// - Log (blockNumber, blockHash, txHash, removed, address, data, etc.)</span>
|
|
<span class="c1">// - args: [ foo, bar ]</span>
|
|
<span class="c1">// - decode: (data, topics) => [ foo, bar ]</span>
|
|
<span class="c1">// - event: "SomeEvent"</span>
|
|
<span class="c1">// - eventSignature: "SomeEvent(address,uint256)"</span>
|
|
<span class="c1">// - removeListener: () => removes this listener</span>
|
|
<span class="c1">// - getBlock: () => returns a Promise of the block</span>
|
|
<span class="c1">// - getTransaction: () => returns a Promise of transaction</span>
|
|
<span class="c1">// - getTransactionReceipt: () => returns a Promise of the receipt</span>
|
|
<span class="p">});</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id13">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Indexed Events — ethers v3</em></span><a class="headerlink" href="#id13" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Detecting a parameters is an indexed hash, and not a value</span>
|
|
<span class="nx">contract</span><span class="p">.</span><span class="nx">someEvent</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">foo</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="k">if</span> <span class="p">(</span><span class="nx">foo</span><span class="p">.</span><span class="nx">indexed</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="c1">// The value is just a hash to filter by</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id14">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Indexed Events — ethers v4</em></span><a class="headerlink" href="#id14" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">Indexed</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">types</span><span class="p">.</span><span class="nx">Indexed</span><span class="p">;</span>
|
|
|
|
<span class="c1">// Detecting a parameters is an indexed hash, and not a value</span>
|
|
<span class="nx">contract</span><span class="p">.</span><span class="nx">someEvent</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">foo</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="k">if</span> <span class="p">(</span><span class="nx">Indexed</span><span class="p">.</span><span class="nx">isIndexed</span><span class="p">(</span><span class="nx">foo</span><span class="p">))</span> <span class="p">{</span>
|
|
<span class="c1">// The value is just a hash to filter by</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id15">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Filtering Events — ethers v4</em></span><a class="headerlink" href="#id15" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Solidity: event SomeEvent(address indexed foo, uint256 bar)</span>
|
|
<span class="kd">let</span> <span class="nx">address</span> <span class="o">=</span> <span class="s1">'0x8B40a2E27C5E87aa66DfA7F80BF675176F49DCA7'</span><span class="p">;</span>
|
|
<span class="kd">let</span> <span class="nx">filter</span> <span class="o">=</span> <span class="nx">contract</span><span class="p">.</span><span class="nx">filters</span><span class="p">.</span><span class="nx">SomeEvent</span><span class="p">(</span><span class="nx">address</span><span class="p">,</span> <span class="kc">null</span><span class="p">);</span>
|
|
|
|
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">filter</span><span class="p">);</span>
|
|
<span class="c1">// {</span>
|
|
<span class="c1">// address: contract.address,</span>
|
|
<span class="c1">// topics: [</span>
|
|
<span class="c1">// 0xdde371250dcd21c331edbb965b9163f4898566e8c60e28868533281edf66ab03,</span>
|
|
<span class="c1">// 0x0000000000000000000000008b40a2e27c5e87aa66dfa7f80bf675176f49dca7</span>
|
|
<span class="c1">// ]</span>
|
|
<span class="c1">// }</span>
|
|
|
|
<span class="nx">contract</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="nx">filter</span><span class="p">,</span> <span class="p">(</span><span class="nx">foo</span><span class="p">,</span> <span class="nx">bar</span><span class="p">,</span> <span class="nx">eventInfo</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
|
|
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">foo</span> <span class="o">===</span> <span class="nx">address</span><span class="p">);</span>
|
|
<span class="c1">// true</span>
|
|
<span class="p">});</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<p>If there are multiple events with the same name:</p>
|
|
<div class="literal-block-wrapper docutils container" id="id16">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Event Name Collision — ethers v4</em></span><a class="headerlink" href="#id16" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Solidity</span>
|
|
<span class="c1">// - event SomeEvent(address foo, uint256 bar)</span>
|
|
<span class="c1">// - event SomeEvent(address foo, address bar)</span>
|
|
|
|
<span class="nx">contract</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="s1">'SomeEvent(address, uint256)'</span><span class="p">,</span> <span class="p">(</span><span class="nx">foo</span><span class="p">,</span> <span class="nx">bar</span><span class="p">,</span> <span class="nx">eventInfo</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
|
|
<span class="c1">// ...</span>
|
|
<span class="p">});</span>
|
|
|
|
<span class="nx">contract</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="s1">'SomeEvent(address, address)'</span><span class="p">,</span> <span class="p">(</span><span class="nx">foo</span><span class="p">,</span> <span class="nx">bar</span><span class="p">,</span> <span class="nx">eventInfo</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
|
|
<span class="c1">// ...</span>
|
|
<span class="p">});</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="fetching-json">
|
|
<h3>Fetching JSON<a class="headerlink" href="#fetching-json" title="Permalink to this headline">¶</a></h3>
|
|
<p>The JSON fetching routine, since it was mostly used for Providers was
|
|
on the Provider object in v3. In v4, it has moved to utils, since there
|
|
are other common cases where it may be useful.</p>
|
|
<div class="literal-block-wrapper docutils container" id="id17">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Fetching JSON — ethers v3</em></span><a class="headerlink" href="#id17" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="nx">ethers</span><span class="p">.</span><span class="nx">providers</span><span class="p">.</span><span class="nx">Provider</span><span class="p">.</span><span class="nx">fetchJson</span><span class="p">(</span><span class="nx">url</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">object</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
|
|
<span class="c1">// ...</span>
|
|
<span class="p">});</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id18">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Fetching JSON — ethers v4</em></span><a class="headerlink" href="#id18" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">fetchJson</span><span class="p">(</span><span class="nx">url</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">object</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
|
|
<span class="c1">// ...</span>
|
|
<span class="p">});</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="interfaces">
|
|
<h3>Interfaces<a class="headerlink" href="#interfaces" title="Permalink to this headline">¶</a></h3>
|
|
<p>This has always been a fairly low-level API, and mostly available for
|
|
framework developers and other tools that require quite specific access
|
|
to working with an ABI. Most of the changes are to simplify the interaction,
|
|
so while there will probably be changes required, if you use this class, the
|
|
complexity and size of your code should be reduced.</p>
|
|
<div class="literal-block-wrapper docutils container" id="id19">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Interface — ethers v3</em></span><a class="headerlink" href="#id19" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">iface</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">Interface</span><span class="p">(</span><span class="nx">address</span><span class="p">,</span> <span class="nx">abi</span><span class="p">,</span> <span class="nx">providerOrSigner</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id20">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Interface — ethers v4</em></span><a class="headerlink" href="#id20" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">iface</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">Interface</span><span class="p">(</span><span class="nx">address</span><span class="p">,</span> <span class="nx">abi</span><span class="p">,</span> <span class="nx">providerOrSigner</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id21">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Function Description — ethers v3</em></span><a class="headerlink" href="#id21" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">address</span> <span class="o">=</span> <span class="s2">"0x8B40a2E27C5E87aa66DfA7F80BF675176F49DCA7"</span><span class="p">;</span>
|
|
<span class="kd">let</span> <span class="nx">value</span> <span class="o">=</span> <span class="mi">1000</span><span class="p">;</span>
|
|
|
|
<span class="c1">// Solidity: function someFunc(address foo, uint256 bar) constant returns (address result)</span>
|
|
<span class="kd">let</span> <span class="nx">functionCallable</span> <span class="o">=</span> <span class="nx">iface</span><span class="p">.</span><span class="nx">functionst</span><span class="p">.</span><span class="nx">someFunc</span>
|
|
<span class="c1">// functionInfo</span>
|
|
<span class="c1">// - inputs: { names: [ "foo", "bar" ], types: [ "address", "uint256" ] }</span>
|
|
<span class="c1">// - outputs: { names: [ "result" ], types: [ "address" ] }</span>
|
|
<span class="c1">// - payable: false</span>
|
|
<span class="c1">// - parseResult: (data) => any</span>
|
|
<span class="c1">// - signature: "someFunc(address,uint256)"</span>
|
|
<span class="c1">// - sighash: "0xd90a6a67"</span>
|
|
|
|
<span class="kd">let</span> <span class="nx">data</span> <span class="o">=</span> <span class="nx">functionCallable</span><span class="p">(</span><span class="nx">address</span><span class="p">,</span> <span class="nx">value</span><span class="p">);</span>
|
|
<span class="kd">let</span> <span class="nx">result</span> <span class="o">=</span> <span class="nx">functionCallable</span><span class="p">.</span><span class="nx">parseResult</span><span class="p">(</span><span class="nx">callResultData</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id22">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Function Description — ethers v4</em></span><a class="headerlink" href="#id22" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">address</span> <span class="o">=</span> <span class="s2">"0x8B40a2E27C5E87aa66DfA7F80BF675176F49DCA7"</span><span class="p">;</span>
|
|
<span class="kd">let</span> <span class="nx">value</span> <span class="o">=</span> <span class="mi">1000</span><span class="p">;</span>
|
|
|
|
<span class="c1">// Solidity: function someFunc(address foo, uint256 bar) constant returns (address result)</span>
|
|
<span class="kd">let</span> <span class="nx">functionInfo</span> <span class="o">=</span> <span class="nx">iface</span><span class="p">.</span><span class="nx">functions</span><span class="p">.</span><span class="nx">someFunc</span><span class="p">;</span>
|
|
<span class="c1">// functionInfo</span>
|
|
<span class="c1">// - type: "call" (or "transaction" for non-constant functions)</span>
|
|
<span class="c1">// - name: "someFunc"</span>
|
|
<span class="c1">// - signature: "someFunc(address,uint256)"</span>
|
|
<span class="c1">// - sighash: "0xd90a6a67"</span>
|
|
<span class="c1">// - inputs: [ { name: foo", type: "bar" }, { name: "bar", type: "uint256" } ]</span>
|
|
<span class="c1">// - outputs: [ { name: "result", type: "address" } ]</span>
|
|
<span class="c1">// - payable: false</span>
|
|
<span class="c1">// - encode: (params) => string</span>
|
|
<span class="c1">// - decode: (data) => any</span>
|
|
|
|
<span class="c1">// Note: This takes in an array; it no longer uses ...args</span>
|
|
<span class="kd">let</span> <span class="nx">data</span> <span class="o">=</span> <span class="nx">functionInfo</span><span class="p">.</span><span class="nx">encode</span><span class="p">([</span> <span class="nx">address</span><span class="p">,</span> <span class="nx">value</span> <span class="p">]);</span>
|
|
<span class="kd">let</span> <span class="nx">result</span> <span class="o">=</span> <span class="nx">functionInfo</span><span class="p">.</span><span class="nx">decode</span><span class="p">(</span><span class="nx">callResultData</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id23">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Event Description — ethers v3</em></span><a class="headerlink" href="#id23" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Solidity: event SomeEvent(address foo, uint256 bar)</span>
|
|
<span class="kd">let</span> <span class="nx">eventInfo</span> <span class="o">=</span> <span class="nx">iface</span><span class="p">.</span><span class="nx">events</span><span class="p">.</span><span class="nx">SomeEvent</span><span class="p">;</span>
|
|
<span class="c1">// eventInfo</span>
|
|
<span class="c1">// - topics: [ ethers.utils.id("SomeEvent(address,uint256)") ]</span>
|
|
<span class="c1">// - anonymous: false</span>
|
|
<span class="c1">// - name: "SomeEvent"</span>
|
|
<span class="c1">// - signature: "SomeEvent(address,uint256)"</span>
|
|
<span class="c1">// - type: "event"</span>
|
|
<span class="c1">// - inputs: { names: [ 'foo', 'bar' ], types: [ 'address', 'uint256' ] }</span>
|
|
<span class="c1">// - parse: (topics, data) => Result</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id24">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Event Description — ethers v4</em></span><a class="headerlink" href="#id24" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Solidity: event SomeEvent(address foo, uint256 bar)</span>
|
|
<span class="kd">let</span> <span class="nx">eventInfo</span> <span class="o">=</span> <span class="nx">iface</span><span class="p">.</span><span class="nx">events</span><span class="p">.</span><span class="nx">SomeEvent</span><span class="p">;</span>
|
|
<span class="c1">// eventInfo</span>
|
|
<span class="c1">// - name: "SomeEvent"</span>
|
|
<span class="c1">// - signature: "SomeEvent(address,bar)"</span>
|
|
<span class="c1">// - inputs: [ { name: "foo", type: "address" }, { name: "bar", type: "uint256" } ]</span>
|
|
<span class="c1">// - anonymous: false</span>
|
|
<span class="c1">// - topic: ethers.utils.id("SomeEvent(address,uint256)")</span>
|
|
<span class="c1">// - encodeTopics: (Array<any>) => Array<string></span>
|
|
<span class="c1">// - decode: (data, topics) => Result</span>
|
|
|
|
<span class="c1">// Create event filter topics</span>
|
|
<span class="kd">let</span> <span class="nx">address</span> <span class="o">=</span> <span class="s1">'0x8B40a2E27C5E87aa66DfA7F80BF675176F49DCA7'</span><span class="p">;</span>
|
|
<span class="nx">eventInfo</span><span class="p">.</span><span class="nx">encodeTopics</span><span class="p">(</span><span class="nx">address</span><span class="p">,</span> <span class="kc">null</span><span class="p">)</span>
|
|
<span class="c1">// topics: [</span>
|
|
<span class="c1">// "0xdde371250dcd21c331edbb965b9163f4898566e8c60e28868533281edf66ab03",</span>
|
|
<span class="c1">// "0x0000000000000000000000008b40a2e27c5e87aa66dfa7f80bf675176f49dca7"</span>
|
|
<span class="c1">// ]</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="networks">
|
|
<h3>Networks<a class="headerlink" href="#networks" title="Permalink to this headline">¶</a></h3>
|
|
<div class="literal-block-wrapper docutils container" id="id25">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Getting Network Info - ethers v3</em></span><a class="headerlink" href="#id25" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">network</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">providers</span><span class="p">.</span><span class="nx">getNetwork</span><span class="p">(</span><span class="s1">'ropsten'</span><span class="p">)</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id26">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Getting Network Info - ethers v4</em></span><a class="headerlink" href="#id26" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">network</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">getNetwork</span><span class="p">(</span><span class="s1">'ropsten'</span><span class="p">);</span>
|
|
|
|
<span class="c1">// Networks may now also be found by their network ID</span>
|
|
<span class="kd">let</span> <span class="nx">network</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">getNetwork</span><span class="p">(</span><span class="mi">3</span><span class="p">);</span>
|
|
|
|
<span class="c1">// And networks can be validated as an object</span>
|
|
<span class="kd">let</span> <span class="nx">network</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">getNetwork</span><span class="p">({</span> <span class="nx">name</span><span class="o">:</span> <span class="s2">"custom"</span><span class="p">,</span> <span class="nx">chainId</span><span class="o">:</span> <span class="mi">1337</span> <span class="p">});</span>
|
|
|
|
<span class="c1">// Validation fails; this will throw an error, since Rinkeby is not</span>
|
|
<span class="c1">// chain ID 1 (homestead is)</span>
|
|
<span class="kd">let</span> <span class="nx">network</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">getNetwork</span><span class="p">({</span> <span class="nx">name</span><span class="o">:</span> <span class="s2">"rinkeby"</span><span class="p">,</span> <span class="nx">chainId</span><span class="o">:</span> <span class="mi">1</span> <span class="p">});</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="parsing-transactions">
|
|
<h3>Parsing Transactions<a class="headerlink" href="#parsing-transactions" title="Permalink to this headline">¶</a></h3>
|
|
<p>The transaction parsing was moved out of the Wallet and into its own class
|
|
in the utilities, along with a general serialization API.</p>
|
|
<div class="literal-block-wrapper docutils container" id="id27">
|
|
<div class="code-block-caption"><span class="caption-text"><em>ethers v3</em></span><a class="headerlink" href="#id27" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">tx</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">Wallet</span><span class="p">.</span><span class="nx">parseTransaction</span><span class="p">(</span><span class="nx">rawTransaction</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id28">
|
|
<div class="code-block-caption"><span class="caption-text"><em>ethers v4</em></span><a class="headerlink" href="#id28" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">tx</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">parseTransaction</span><span class="p">(</span><span class="nx">rawTransaction</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="custom-signer">
|
|
<h3>Custom Signer<a class="headerlink" href="#custom-signer" title="Permalink to this headline">¶</a></h3>
|
|
<div class="literal-block-wrapper docutils container" id="id29">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Custome Signer — ethers v3</em></span><a class="headerlink" href="#id29" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">signer</span> <span class="o">=</span> <span class="p">{</span>
|
|
<span class="c1">// Required</span>
|
|
<span class="nx">getAddress</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="p">...</span> <span class="p">},</span>
|
|
<span class="nx">provider</span><span class="o">:</span> <span class="nx">provider</span><span class="p">,</span>
|
|
|
|
<span class="c1">// Optional</span>
|
|
<span class="nx">estimateGas</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">tx</span><span class="p">)</span> <span class="p">{</span> <span class="p">...</span> <span class="p">},</span>
|
|
<span class="nx">sendTransaction</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">tx</span><span class="p">)</span> <span class="p">{</span> <span class="p">...</span> <span class="p">},</span>
|
|
<span class="nx">sign</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">tx</span><span class="p">)</span> <span class="p">{</span> <span class="p">...</span> <span class="p">},</span>
|
|
<span class="p">};</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id30">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Custom Signer — JavaScript — ethers v4</em></span><a class="headerlink" href="#id30" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">function</span> <span class="nx">CustomSigner</span> <span class="p">{</span>
|
|
<span class="nx">ethers</span><span class="p">.</span><span class="nx">Signer</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>
|
|
|
|
<span class="c1">// Optional</span>
|
|
<span class="k">this</span><span class="p">.</span><span class="nx">provider</span> <span class="o">=</span> <span class="nx">provider</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
<span class="nx">inherits</span><span class="p">(</span><span class="nx">CustomSigner</span><span class="p">,</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">Signer</span><span class="p">);</span>
|
|
|
|
<span class="c1">// Required</span>
|
|
<span class="nx">CustomSigner</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">getAddress</span> <span class="o">=</span> <span class="p">()</span> <span class="p">=></span> <span class="p">{</span> <span class="p">...</span> <span class="p">};</span>
|
|
<span class="nx">CustomSigner</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">sendTransaction</span> <span class="o">=</span> <span class="p">(</span><span class="nx">tx</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span> <span class="p">...</span> <span class="p">};</span>
|
|
<span class="nx">CustomSigner</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">signMessage</span> <span class="o">=</span> <span class="p">(</span><span class="nx">message</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span> <span class="p">...</span> <span class="p">};</span>
|
|
|
|
<span class="c1">// Optional</span>
|
|
<span class="nx">CustomSigner</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">connect</span> <span class="o">=</span> <span class="p">(</span><span class="nx">provider</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span> <span class="p">...</span> <span class="p">};</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id31">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Custom Signer — TypeScript — ethers v4</em></span><a class="headerlink" href="#id31" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kr">import</span> <span class="p">{</span>
|
|
<span class="nx">Signer</span><span class="p">,</span>
|
|
<span class="nx">utils</span>
|
|
<span class="p">}</span> <span class="nx">from</span> <span class="s1">'ethers'</span><span class="p">;</span>
|
|
|
|
<span class="kr">import</span> <span class="p">{</span>
|
|
<span class="nx">Provider</span><span class="p">,</span>
|
|
<span class="nx">TransactionRequest</span><span class="p">,</span>
|
|
<span class="nx">TransactionReqponse</span>
|
|
<span class="p">}</span> <span class="nx">from</span> <span class="s1">'ethers/providers'</span><span class="p">;</span>
|
|
|
|
<span class="kr">class</span> <span class="nx">CustomSigner</span> <span class="kr">extends</span> <span class="nx">Signer</span> <span class="p">{</span>
|
|
<span class="k">this</span><span class="p">.</span><span class="nx">provider</span> <span class="o">=</span> <span class="nx">provider</span><span class="p">;</span>
|
|
<span class="nx">readony</span> <span class="nx">provider</span><span class="o">:</span> <span class="nx">Provider</span><span class="p">;</span>
|
|
<span class="nx">constructor</span><span class="p">(</span><span class="nx">provider</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="kr">super</span><span class="p">();</span>
|
|
|
|
<span class="c1">// Optional</span>
|
|
<span class="k">this</span><span class="p">.</span><span class="nx">provider</span> <span class="o">=</span> <span class="c1">// ...</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="nx">getAddress</span><span class="p">()</span> <span class="p">{</span>
|
|
<span class="c1">// Return a promise to the address</span>
|
|
<span class="p">};</span>
|
|
|
|
<span class="nx">sendTransaction</span> <span class="o">=</span> <span class="p">(</span><span class="nx">transaction</span><span class="o">:</span> <span class="nx">TransactionRequest</span><span class="p">)</span><span class="o">:</span> <span class="nb">Promise</span><span class="o"><</span><span class="nx">TransaxctinResponse</span><span class="o">></span> <span class="p">{</span>
|
|
<span class="c1">// This will popualte missing properties, like nonce, gasLimit, etc</span>
|
|
<span class="k">return</span> <span class="nx">utils</span><span class="p">.</span><span class="nx">populateTransaction</span><span class="p">(</span><span class="nx">transaction</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">tx</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
|
|
<span class="c1">// Send the transaction and resolve the transaction</span>
|
|
<span class="p">});</span>
|
|
<span class="p">};</span>
|
|
|
|
<span class="nx">signMessage</span><span class="p">(</span><span class="nx">message</span><span class="o">:</span> <span class="nx">string</span> <span class="o">|</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">Arrayish</span><span class="p">)</span><span class="o">:</span> <span class="nb">Promise</span><span class="o"><</span><span class="nx">string</span><span class="o">></span> <span class="p">{</span>
|
|
<span class="kd">let</span> <span class="nx">dataToSign</span><span class="o">:</span> <span class="nx">Uint8Array</span> <span class="o">=</span> <span class="nx">utils</span><span class="p">.</span><span class="nx">hashMessage</span><span class="p">(</span><span class="nx">message</span><span class="p">);;</span>
|
|
<span class="c1">// Sign ths dataToSign and resolve teh flat-format signature</span>
|
|
<span class="p">};</span>
|
|
|
|
<span class="c1">// Optional; highly recommended</span>
|
|
<span class="nx">connect</span><span class="p">(</span><span class="nx">provider</span><span class="o">:</span> <span class="nx">Provider</span><span class="p">)</span><span class="o">:</span> <span class="nx">CustomSigner</span> <span class="p">{</span>
|
|
<span class="k">return</span> <span class="k">new</span> <span class="nx">CustomSigner</span><span class="p">(</span><span class="nx">provider</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="default-provider">
|
|
<h3>Default Provider<a class="headerlink" href="#default-provider" title="Permalink to this headline">¶</a></h3>
|
|
<div class="literal-block-wrapper docutils container" id="id32">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Default Provider — ethers v3</em></span><a class="headerlink" href="#id32" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">provider</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">providers</span><span class="p">.</span><span class="nx">getDefaultProvider</span><span class="p">();</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="literal-block-wrapper docutils container" id="id33">
|
|
<div class="code-block-caption"><span class="caption-text"><em>Default Provider — ethers v4</em></span><a class="headerlink" href="#id33" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">provider</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">getDefaultProvider</span><span class="p">();</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="big-number">
|
|
<h3>Big Number<a class="headerlink" href="#big-number" title="Permalink to this headline">¶</a></h3>
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<div class="literal-block-wrapper docutils container" id="id34">
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<div class="code-block-caption"><span class="caption-text"><em>isBigNumber — ethers v3</em></span><a class="headerlink" href="#id34" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">checkBigNumber</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">isBigNumber</span><span class="p">(</span><span class="nx">value</span><span class="p">);</span>
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</pre></div>
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</div>
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</div>
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<div class="literal-block-wrapper docutils container" id="id35">
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<div class="code-block-caption"><span class="caption-text"><em>isBigNumber — ethers v4</em></span><a class="headerlink" href="#id35" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">checkBigNumber</span> <span class="o">=</span> <span class="nx">BigNumber</span><span class="p">.</span><span class="nx">isBigNumber</span><span class="p">(</span><span class="nx">value</span><span class="p">);</span>
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</pre></div>
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</div>
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</div>
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</div>
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<hr class="docutils" />
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<div class="section" id="jsonrpcprovider">
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<h3>JsonRpcProvider<a class="headerlink" href="#jsonrpcprovider" title="Permalink to this headline">¶</a></h3>
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<div class="literal-block-wrapper docutils container" id="id36">
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<div class="code-block-caption"><span class="caption-text"><em>Connecting — ethers v3</em></span><a class="headerlink" href="#id36" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">url</span> <span class="o">=</span> <span class="s2">"http://localhost:8545"</span><span class="p">;</span>
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<span class="kd">let</span> <span class="nx">network</span> <span class="o">=</span> <span class="s2">"rinkeby"</span><span class="p">;</span>
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<span class="kd">let</span> <span class="nx">provider</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">providers</span><span class="p">.</span><span class="nx">JsonRpcProvider</span><span class="p">(</span><span class="nx">url</span><span class="p">,</span> <span class="nx">network</span><span class="p">);</span>
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<span class="c1">// Even if the network was wrong, this would mostly seem to work and</span>
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<span class="c1">// fail once the chain ID was attempted</span>
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<span class="c1">// The network was a synchronous property on Provider</span>
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<span class="kd">let</span> <span class="nx">network</span> <span class="o">=</span> <span class="nx">provider</span><span class="p">.</span><span class="nx">network</span><span class="p">;</span>
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</pre></div>
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</div>
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</div>
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<div class="literal-block-wrapper docutils container" id="id37">
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<div class="code-block-caption"><span class="caption-text"><em>Connecting — ethers v4</em></span><a class="headerlink" href="#id37" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// In v4, the network is automatically determined; you may override</span>
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<span class="c1">// the network, but it must match, or it will fail early</span>
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|
|
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<span class="kd">let</span> <span class="nx">url</span> <span class="o">=</span> <span class="s2">"http://localhost:8545"</span><span class="p">;</span>
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<span class="kd">let</span> <span class="nx">provider</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">providers</span><span class="p">.</span><span class="nx">JsonRpcProvider</span><span class="p">(</span><span class="nx">url</span><span class="p">);</span>
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<span class="c1">// The network is now an asynchronous property:</span>
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|
<span class="nx">provider</span><span class="p">.</span><span class="nx">getNetwork</span><span class="p">().</span><span class="nx">then</span><span class="p">((</span><span class="nx">network</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="c1">// ...</span>
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<span class="p">});</span>
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|
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<span class="c1">// One useful and common exception it that, if any async call from</span>
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|
<span class="c1">// the provider has ever succeeded, the synchronous network property</span>
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<span class="c1">// is then valid. The network property is populated before any</span>
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|
<span class="c1">// async call is made, so once an async call has finished, the network</span>
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|
<span class="c1">// property is available synchronously.</span>
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|
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|
<span class="nx">async</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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|
<span class="nx">await</span> <span class="nx">provider</span><span class="p">.</span><span class="nx">getBlockNumber</span><span class="p">();</span>
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<span class="kd">let</span> <span class="nx">network</span> <span class="o">=</span> <span class="nx">provider</span><span class="p">.</span><span class="nx">network</span><span class="p">;</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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</div>
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<div class="literal-block-wrapper docutils container" id="id38">
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|
<div class="code-block-caption"><span class="caption-text"><em>Sending Transactions — ethers v3</em></span><a class="headerlink" href="#id38" title="Permalink to this code">¶</a></div>
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|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="nx">provider</span><span class="p">.</span><span class="nx">sendTransaction</span><span class="p">(</span><span class="nx">rawTransaction</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">hash</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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|
<span class="c1">// Just a transaction hash</span>
|
|
<span class="p">});</span>
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|
</pre></div>
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|
</div>
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|
</div>
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|
<div class="literal-block-wrapper docutils container" id="id39">
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|
<div class="code-block-caption"><span class="caption-text"><em>Sending Transactions — ethers v4</em></span><a class="headerlink" href="#id39" title="Permalink to this code">¶</a></div>
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|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="nx">provider</span><span class="p">.</span><span class="nx">sendTransaction</span><span class="p">(</span><span class="nx">rawTransaction</span><span class="p">).</span><span class="nx">then</span><span class="p">((</span><span class="nx">transaction</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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|
<span class="c1">// A full Transaction Response is returned</span>
|
|
<span class="c1">// - from</span>
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|
<span class="c1">// - to</span>
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|
<span class="c1">// - gasLimit, gasPrice</span>
|
|
<span class="c1">// - nonce</span>
|
|
<span class="c1">// - r, s, v</span>
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|
<span class="c1">// - wait() => Promise that resolves the Transaction Receipt once mined</span>
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|
<span class="c1">// and rejects with an error is the stats is 0; the error</span>
|
|
<span class="c1">// will have a transactionHash property as well as a</span>
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|
<span class="c1">// transaction property.</span>
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|
|
|
<span class="kd">let</span> <span class="nx">hash</span> <span class="o">=</span> <span class="nx">transaction</span><span class="p">.</span><span class="nx">hash</span><span class="p">;</span>
|
|
<span class="p">});</span>
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|
</pre></div>
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</div>
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</div>
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</div>
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<hr class="docutils" />
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<div class="section" id="verifying-messages">
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|
<h3>Verifying Messages<a class="headerlink" href="#verifying-messages" title="Permalink to this headline">¶</a></h3>
|
|
<p>The message verification was moved from a static class on the Wallet to the
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|
utilities, along with a few other functions of the elliptic curve cryptographic
|
|
exposed.</p>
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<div class="literal-block-wrapper docutils container" id="id40">
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|
<div class="code-block-caption"><span class="caption-text"><em>ethers v3</em></span><a class="headerlink" href="#id40" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">signingAddress</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">Wallet</span><span class="p">.</span><span class="nx">verifyMessage</span><span class="p">(</span><span class="nx">message</span><span class="p">,</span> <span class="nx">signature</span><span class="p">);</span>
|
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</pre></div>
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</div>
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</div>
|
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<div class="literal-block-wrapper docutils container" id="id41">
|
|
<div class="code-block-caption"><span class="caption-text"><em>ethers v4</em></span><a class="headerlink" href="#id41" title="Permalink to this code">¶</a></div>
|
|
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span> <span class="nx">signingAddress</span> <span class="o">=</span> <span class="nx">ethers</span><span class="p">.</span><span class="nx">utils</span><span class="p">.</span><span class="nx">verifyMessage</span><span class="p">(</span><span class="nx">message</span><span class="p">,</span> <span class="nx">signature</span><span class="p">);</span>
|
|
</pre></div>
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</div>
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</div>
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</div>
|
|
<hr class="docutils" />
|
|
<div class="section" id="waiting-for-transactions">
|
|
<h3>Waiting for Transactions<a class="headerlink" href="#waiting-for-transactions" title="Permalink to this headline">¶</a></h3>
|
|
<p>In v3, the <code class="docutils literal notranslate"><span class="pre">transaction.wait()</span></code> returned a Promise which would resolve to the
|
|
<strong>TransactionResponse</strong> once it is mined.</p>
|
|
<p>In v4, the <code class="docutils literal notranslate"><span class="pre">transaction.wait()</span></code> returned a Promise which would resolve to the
|
|
<strong>TransactionReceipt</strong> once it is mined.</p>
|
|
<hr class="docutils" />
|
|
</div>
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