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<h1 id="contract-examples">Contract examples</h1>
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<h2 id="crowdfunding">Crowdfunding</h2>
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<div class="highlight"><pre><span></span><code><span class="cm">/*</span>
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<span class="cm"> * A simple crowd-funding example</span>
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<span class="cm"> */</span><span class="w"></span>
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<span class="k">contract</span><span class="w"> </span><span class="nf">FundMe</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="k">record</span><span class="w"> </span><span class="n">spend_args</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">recipient</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">address</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">amount</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="p">}</span><span class="w"></span>
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<span class="w"> </span><span class="k">record</span><span class="w"> </span><span class="nb">state</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">contributions</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">map</span><span class="p">(</span><span class="kt">address</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="p">),</span><span class="w"></span>
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<span class="w"> </span><span class="n">total</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">int</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">beneficiary</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">address</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">deadline</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">int</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">goal</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="p">}</span><span class="w"></span>
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<span class="w"> </span><span class="k">stateful</span><span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="n">spend</span><span class="p">(</span><span class="n">args</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="n">spend_args</span><span class="p">)</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="nc">Chain</span><span class="p">.</span><span class="n">spend</span><span class="p">(</span><span class="n">args</span><span class="p">.</span><span class="n">recipient</span><span class="p">,</span><span class="w"> </span><span class="n">args</span><span class="p">.</span><span class="n">amount</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="k">entrypoint</span><span class="w"> </span><span class="n">init</span><span class="p">(</span><span class="n">beneficiary</span><span class="p">,</span><span class="w"> </span><span class="n">deadline</span><span class="p">,</span><span class="w"> </span><span class="n">goal</span><span class="p">)</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="nb">state</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">contributions</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="p">{},</span><span class="w"></span>
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<span class="w"> </span><span class="n">beneficiary</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">beneficiary</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">deadline</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">deadline</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">total</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">goal</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">goal</span><span class="w"> </span><span class="p">}</span><span class="w"></span>
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<span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="n">is_contributor</span><span class="p">(</span><span class="n">addr</span><span class="p">)</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="nc">Map</span><span class="p">.</span><span class="n">member</span><span class="p">(</span><span class="n">addr</span><span class="p">,</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">contributions</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="k">stateful</span><span class="w"> </span><span class="k">entrypoint</span><span class="w"> </span><span class="n">contribute</span><span class="p">()</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="nc">Chain</span><span class="p">.</span><span class="n">block_height</span><span class="w"> </span><span class="ow">>=</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">deadline</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="n">spend</span><span class="p">({</span><span class="w"> </span><span class="n">recipient</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nc">Call</span><span class="p">.</span><span class="n">caller</span><span class="p">,</span><span class="w"> </span><span class="n">amount</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nc">Call</span><span class="p">.</span><span class="n">value</span><span class="w"> </span><span class="p">})</span><span class="w"> </span><span class="c1">// Refund money</span>
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<span class="w"> </span><span class="kc">false</span><span class="w"></span>
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<span class="w"> </span><span class="k">else</span><span class="w"></span>
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<span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">amount</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="k">switch</span><span class="p">(</span><span class="nc">Map</span><span class="p">.</span><span class="n">lookup</span><span class="p">(</span><span class="nc">Call</span><span class="p">.</span><span class="n">caller</span><span class="p">,</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">contributions</span><span class="p">))</span><span class="w"></span>
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<span class="w"> </span><span class="nf">None</span><span class="w"> </span><span class="ow">=></span><span class="w"> </span><span class="nc">Call</span><span class="p">.</span><span class="n">value</span><span class="w"></span>
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<span class="w"> </span><span class="nf">Some</span><span class="p">(</span><span class="n">n</span><span class="p">)</span><span class="w"> </span><span class="ow">=></span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="ow">+</span><span class="w"> </span><span class="nc">Call</span><span class="p">.</span><span class="n">value</span><span class="w"></span>
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<span class="w"> </span><span class="nb">put</span><span class="p">(</span><span class="nb">state</span><span class="p">{</span><span class="w"> </span><span class="n">contributions</span><span class="p">[</span><span class="nc">Call</span><span class="p">.</span><span class="n">caller</span><span class="p">]</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">amount</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">total</span><span class="w"> </span><span class="ow">@</span><span class="w"> </span><span class="n">tot</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">tot</span><span class="w"> </span><span class="ow">+</span><span class="w"> </span><span class="nc">Call</span><span class="p">.</span><span class="n">value</span><span class="w"> </span><span class="p">})</span><span class="w"></span>
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<span class="w"> </span><span class="kc">true</span><span class="w"></span>
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<span class="w"> </span><span class="k">stateful</span><span class="w"> </span><span class="k">entrypoint</span><span class="w"> </span><span class="n">withdraw</span><span class="p">()</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="nc">Chain</span><span class="p">.</span><span class="n">block_height</span><span class="w"> </span><span class="ow"><</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">deadline</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="nb">abort</span><span class="p">(</span><span class="s2">"Cannot withdraw before deadline"</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="nc">Call</span><span class="p">.</span><span class="n">caller</span><span class="w"> </span><span class="ow">==</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">beneficiary</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="n">withdraw_beneficiary</span><span class="p">()</span><span class="w"></span>
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<span class="w"> </span><span class="k">elif</span><span class="p">(</span><span class="n">is_contributor</span><span class="p">(</span><span class="nc">Call</span><span class="p">.</span><span class="n">caller</span><span class="p">))</span><span class="w"></span>
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<span class="w"> </span><span class="n">withdraw_contributor</span><span class="p">()</span><span class="w"></span>
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<span class="w"> </span><span class="k">else</span><span class="w"></span>
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<span class="w"> </span><span class="nb">abort</span><span class="p">(</span><span class="s2">"Not a contributor or beneficiary"</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="k">stateful</span><span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="n">withdraw_beneficiary</span><span class="p">()</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="nb">require</span><span class="p">(</span><span class="nb">state</span><span class="p">.</span><span class="n">total</span><span class="w"> </span><span class="ow">>=</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">goal</span><span class="p">,</span><span class="w"> </span><span class="s2">"Project was not funded"</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="n">spend</span><span class="p">({</span><span class="n">recipient</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">beneficiary</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">amount</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nc">Contract</span><span class="p">.</span><span class="n">balance</span><span class="w"> </span><span class="p">})</span><span class="w"></span>
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<span class="w"> </span><span class="k">stateful</span><span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="n">withdraw_contributor</span><span class="p">()</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="nb">state</span><span class="p">.</span><span class="n">total</span><span class="w"> </span><span class="ow">>=</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">goal</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="nb">abort</span><span class="p">(</span><span class="s2">"Project was funded"</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">to</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nc">Call</span><span class="p">.</span><span class="n">caller</span><span class="w"></span>
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<span class="w"> </span><span class="n">spend</span><span class="p">({</span><span class="n">recipient</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">to</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="n">amount</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nb">state</span><span class="p">.</span><span class="n">contributions</span><span class="p">[</span><span class="n">to</span><span class="p">]})</span><span class="w"></span>
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<span class="w"> </span><span class="nb">put</span><span class="p">(</span><span class="nb">state</span><span class="p">{</span><span class="w"> </span><span class="n">contributions</span><span class="w"> </span><span class="ow">@</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nc">Map</span><span class="p">.</span><span class="n">delete</span><span class="p">(</span><span class="n">to</span><span class="p">,</span><span class="w"> </span><span class="n">c</span><span class="p">)</span><span class="w"> </span><span class="p">})</span><span class="w"></span>
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</code></pre></div>
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<p>```sophia
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/<em>
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* A simple crowd-funding example
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</em>/
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contract FundMe =</p>
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<p>record spend_args = { recipient : address,
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amount : int }</p>
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<p>record state = { contributions : map(address, int),
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total : int,
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beneficiary : address,
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deadline : int,
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goal : int }</p>
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<p>stateful function spend(args : spend_args) =
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Chain.spend(args.recipient, args.amount)</p>
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<p>entrypoint init(beneficiary, deadline, goal) : state =
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{ contributions = {},
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beneficiary = beneficiary,
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deadline = deadline,
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total = 0,
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goal = goal }</p>
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<p>function is_contributor(addr) =
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Map.member(addr, state.contributions)</p>
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<p>stateful entrypoint contribute() =
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if(Chain.block_height >= state.deadline)
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spend({ recipient = Call.caller, amount = Call.value }) // Refund money
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false
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else
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let amount =
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switch(Map.lookup(Call.caller, state.contributions))
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None => Call.value
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Some(n) => n + Call.value
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put(state{ contributions[Call.caller] = amount,
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total @ tot = tot + Call.value })
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true</p>
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<p>stateful entrypoint withdraw() =
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if(Chain.block_height < state.deadline)
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abort("Cannot withdraw before deadline")
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if(Call.caller == state.beneficiary)
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withdraw_beneficiary()
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elif(is_contributor(Call.caller))
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withdraw_contributor()
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else
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abort("Not a contributor or beneficiary")</p>
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<p>stateful function withdraw_beneficiary() =
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require(state.total >= state.goal, "Project was not funded")
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spend({recipient = state.beneficiary,
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amount = Contract.balance })</p>
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<p>stateful function withdraw_contributor() =
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if(state.total >= state.goal)
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abort("Project was funded")
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let to = Call.caller
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spend({recipient = to,
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amount = state.contributions[to]})
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put(state{ contributions @ c = Map.delete(to, c) })
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```</p>
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<h2 id="repositories">Repositories</h2>
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<p>This is a list with repositories that include smart contracts written in Sophia:</p>
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<ul>
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Reference in New Issue
Block a user