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atom.xml
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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title><![CDATA[黃金俠]]></title>
<link href="http://rubyist.marsz.tw/atom.xml" rel="self"/>
<link href="http://rubyist.marsz.tw/"/>
<updated>2013-06-11T10:10:46+08:00</updated>
<id>http://rubyist.marsz.tw/</id>
<author>
<name><![CDATA[MarsZ]]></name>
<email><![CDATA[[email protected]]]></email>
</author>
<generator uri="http://octopress.org/">Octopress</generator>
<entry>
<title type="html"><![CDATA[透過 sidekiq 實作背景工作 (background job)]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-06-08/sidekiq/"/>
<updated>2013-06-08T15:08:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-06-08/sidekiq</id>
<content type="html"><![CDATA[<p><code>sidekiq</code> 是一套可以用來實作 background job 的 gem<br/>
舉凡長時間的執行如 email, 點數計算等等非即時性的工作, 都可以採用非同步執行<br/>
以加速前端服務的反應速度或減低主機負荷<br/>
和 <code>resque</code> 一樣，<code>sidekiq</code> 是以 redis 做為 <code>Message Queue</code> 來運作…</p>
<!-- more -->
<h3>安裝</h3>
<p>本教學所使用的版本是 2.12.1</p>
<figure class='code'><figcaption><span>Gemfile</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">gem</span> <span class="s2">"sidekiq"</span><span class="p">,</span> <span class="s2">"~> 2.12.1"</span>
</span></code></pre></td></tr></table></div></figure>
<p>設定 redis<br/>
關於 redis 安裝可參考 <a href="http://pm.5fpro.com/projects/public-wiki/wiki/Redis" target="_blank">http://pm.5fpro.com/projects/public-wiki/wiki/Redis</a></p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="no">Sidekiq</span><span class="o">.</span><span class="n">configure_server</span> <span class="k">do</span> <span class="o">|</span><span class="n">config</span><span class="o">|</span>
</span><span class='line'> <span class="n">config</span><span class="o">.</span><span class="n">redis</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">:url</span> <span class="o">=></span> <span class="s2">"redis://127.0.0.1:6379/0"</span> <span class="p">}</span>
</span><span class='line'><span class="k">end</span>
</span><span class='line'>
</span><span class='line'><span class="no">Sidekiq</span><span class="o">.</span><span class="n">configure_client</span> <span class="k">do</span> <span class="o">|</span><span class="n">config</span><span class="o">|</span>
</span><span class='line'> <span class="n">config</span><span class="o">.</span><span class="n">redis</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">:url</span> <span class="o">=></span> <span class="s2">"redis://127.0.0.1:6379/0"</span> <span class="p">}</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h3>使用 (定義 worker)</h3>
<p>定義 worker</p>
<figure class='code'><figcaption><span>foo_worker.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">class</span> <span class="nc">FooWorker</span>
</span><span class='line'> <span class="kp">include</span> <span class="no">Sidekiq</span><span class="o">::</span><span class="no">Worker</span>
</span><span class='line'> <span class="n">sidekiq_options</span> <span class="ss">:queue</span> <span class="o">=></span> <span class="ss">:barbar_queue</span><span class="p">,</span> <span class="ss">:retry</span> <span class="o">=></span> <span class="kp">false</span><span class="p">,</span> <span class="ss">:backtrace</span> <span class="o">=></span> <span class="kp">true</span>
</span><span class='line'>
</span><span class='line'> <span class="k">def</span> <span class="nf">perform</span><span class="p">(</span><span class="nb">name</span><span class="p">,</span> <span class="n">count</span><span class="p">)</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>啟動 worker (-c 代表 concurrency worker 數)</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">bundle</span> <span class="nb">exec</span> <span class="n">sidekiq</span> <span class="o">-</span><span class="n">c</span> <span class="mi">1</span>
</span></code></pre></td></tr></table></div></figure>
<p>把工作丟到 queue 裡</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="no">FooWorker</span><span class="o">.</span><span class="n">perform_async</span><span class="p">(</span><span class="s2">"haha"</span><span class="p">,</span> <span class="mi">11</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<p>這時若有啟動 worker 就會從 redis 把工作抓下來執行</p>
<h3>使用 (delay methods)</h3>
<p>直接丟到 queue 裡</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="no">Bar</span><span class="o">.</span><span class="n">delay</span><span class="o">.</span><span class="n">some_method</span><span class="p">(</span><span class="s2">"haha"</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<p>也可以以 instance 丟</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">user</span> <span class="o">=</span> <span class="no">User</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
</span><span class='line'><span class="n">user</span><span class="o">.</span><span class="n">delay</span><span class="o">.</span><span class="n">increase_credit</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<p>延遲至某短時間後再讓 worker 執行</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">user</span><span class="o">.</span><span class="n">delay_for</span><span class="p">(</span><span class="mi">1</span><span class="o">.</span><span class="n">day</span><span class="p">)</span><span class="o">.</span><span class="n">increase_credit</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<p>延遲至某個時間點再給 worker 執行</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">user</span><span class="o">.</span><span class="n">delay_until</span><span class="p">(</span><span class="mi">3</span><span class="o">.</span><span class="n">hour</span><span class="o">.</span><span class="n">from_now</span><span class="p">)</span><span class="o">.</span><span class="n">increase_credit</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<h3>設定 Web console</h3>
<figure class='code'><figcaption><span>Gemfile</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">gem</span> <span class="s1">'slim'</span>
</span><span class='line'><span class="n">gem</span> <span class="s1">'sinatra'</span><span class="p">,</span> <span class="s1">'>= 1.3.0'</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span>config/routes.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="nb">require</span> <span class="s1">'sidekiq/web'</span>
</span><span class='line'><span class="o">.</span><span class="n">.</span><span class="o">.</span>
</span><span class='line'> <span class="n">mount</span> <span class="no">Sidekiq</span><span class="o">::</span><span class="no">Web</span> <span class="o">=></span> <span class="s1">'/sidekiq'</span>
</span></code></pre></td></tr></table></div></figure>
<p>web console 想要綁 devise 登入 (假設 scoep 為 member 且 <code>.is_admin</code> 必須為 true )<br/>
(更多可參考 <a href="https://github.com/mperham/sidekiq/wiki/Monitoring" target="_blank">https://github.com/mperham/sidekiq/wiki/Monitoring</a>)</p>
<figure class='code'><figcaption><span>config/routes.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'> <span class="n">sidekiq_constraints</span> <span class="o">=</span> <span class="nb">lambda</span><span class="p">{</span> <span class="o">|</span><span class="n">request</span><span class="o">|</span>
</span><span class='line'> <span class="n">request</span><span class="o">.</span><span class="n">env</span><span class="o">[</span><span class="s1">'warden'</span><span class="o">].</span><span class="n">authenticate!</span><span class="p">({</span> <span class="ss">:scope</span> <span class="o">=></span> <span class="ss">:member</span> <span class="p">})</span> <span class="o">&&</span>
</span><span class='line'> <span class="n">request</span><span class="o">.</span><span class="n">env</span><span class="o">[</span><span class="s1">'warden'</span><span class="o">].</span><span class="n">user</span><span class="p">(</span><span class="ss">:member</span><span class="p">)</span><span class="o">.</span><span class="n">is_admin</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="n">constraints</span> <span class="n">sidekiq_constraints</span> <span class="k">do</span>
</span><span class='line'> <span class="n">mount</span> <span class="no">Sidekiq</span><span class="o">::</span><span class="no">Web</span> <span class="o">=></span> <span class="s1">'/sidekiq'</span>
</span><span class='line'> <span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<h3>佈署</h3>
<figure class='code'><figcaption><span>config/deploy.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">set</span> <span class="ss">:sidekiq_cmd</span><span class="p">,</span> <span class="s2">"bundle exec sidekiq"</span>
</span><span class='line'><span class="n">set</span> <span class="ss">:sidekiqctl_cmd</span><span class="p">,</span> <span class="s2">"bundle exec sidekiqctl"</span>
</span><span class='line'>
</span><span class='line'><span class="nb">require</span> <span class="s1">'sidekiq/capistrano'</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span>config/sidekiq.yml</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='yaml'><span class='line'><span class="nn">---</span>
</span><span class='line'><span class="l-Scalar-Plain">:verbose</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">false</span>
</span><span class='line'><span class="l-Scalar-Plain">:concurrency</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">1</span>
</span><span class='line'><span class="l-Scalar-Plain">staging</span><span class="p-Indicator">:</span>
</span><span class='line'> <span class="l-Scalar-Plain">:concurrency</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">1</span>
</span><span class='line'><span class="l-Scalar-Plain">production</span><span class="p-Indicator">:</span>
</span><span class='line'> <span class="l-Scalar-Plain">:concurrency</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">10</span>
</span><span class='line'> <span class="l-Scalar-Plain">:queues</span><span class="p-Indicator">:</span>
</span><span class='line'> <span class="p-Indicator">-</span> <span class="p-Indicator">[</span><span class="nv">default</span><span class="p-Indicator">,</span> <span class="nv">1</span><span class="p-Indicator">]</span>
</span><span class='line'> <span class="p-Indicator">-</span> <span class="p-Indicator">[</span><span class="nv">mailer</span><span class="p-Indicator">,</span> <span class="nv">9</span><span class="p-Indicator">]</span>
</span></code></pre></td></tr></table></div></figure>
<h3>venus</h3>
<p>上述設定也可透過 gem <code>venus</code> 完成</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">rails</span> <span class="n">g</span> <span class="n">venus</span><span class="ss">:sidekiq</span>
</span></code></pre></td></tr></table></div></figure>
<h3>參考教學</h3>
<p><a href="http://railscasts.com/episodes/366-sidekiq" target="_blank">RailsCast</a><br/>
<a href="https://github.com/mperham/sidekiq/wiki" target="_blank">Official Document</a></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[讓 S3 允許 cross-domain 存取]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-06-06/aws-s3-allow-cross-origin-access/"/>
<updated>2013-06-06T01:48:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-06-06/aws-s3-allow-cross-origin-access</id>
<content type="html"><![CDATA[<p>檔案放上 <code>S3</code> 後，可能會需要透過 <code>cross-domain</code> 存取 (例如 web font)<br/>
這時可以透過 <code>S3</code> bucket 的 <code>CORS</code> 設定達成</p>
<!-- more -->
<p><img src="http://i.imgur.com/7vjeF3g.png" alt="S3 bucket CORS" /></p>
<p>開啟後如同以下內容設定即可開放 <code>GET</code> 的跨網域存取</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
</pre></td><td class='code'><pre><code class='xml'><span class='line'><span class="cp"><?xml version="1.0" encoding="UTF-8"?></span>
</span><span class='line'><span class="nt"><CORSConfiguration</span> <span class="na">xmlns=</span><span class="s">"http://s3.amazonaws.com/doc/2006-03-01/"</span><span class="nt">></span>
</span><span class='line'> <span class="nt"><CORSRule></span>
</span><span class='line'> <span class="nt"><AllowedOrigin></span>*<span class="nt"></AllowedOrigin></span>
</span><span class='line'> <span class="nt"><AllowedMethod></span>GET<span class="nt"></AllowedMethod></span>
</span><span class='line'> <span class="nt"><AllowedHeader></span>*<span class="nt"></AllowedHeader></span>
</span><span class='line'> <span class="nt"></CORSRule></span>
</span><span class='line'><span class="nt"></CORSConfiguration></span>
</span></code></pre></td></tr></table></div></figure>
<p>如果要開放其他 HTTP method…</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='xml'><span class='line'><span class="cp"><?xml version="1.0" encoding="UTF-8"?></span>
</span><span class='line'><span class="nt"><CORSConfiguration</span> <span class="na">xmlns=</span><span class="s">"http://s3.amazonaws.com/doc/2006-03-01/"</span><span class="nt">></span>
</span><span class='line'> <span class="nt"><CORSRule></span>
</span><span class='line'> <span class="nt"><AllowedOrigin></span>*<span class="nt"></AllowedOrigin></span>
</span><span class='line'> <span class="nt"><AllowedMethod></span>GET<span class="nt"></AllowedMethod></span>
</span><span class='line'> <span class="nt"><AllowedMethod></span>POST<span class="nt"></AllowedMethod></span>
</span><span class='line'> <span class="nt"><AllowedMethod></span>PUT<span class="nt"></AllowedMethod></span>
</span><span class='line'> <span class="nt"><AllowedHeader></span>*<span class="nt"></AllowedHeader></span>
</span><span class='line'> <span class="nt"></CORSRule></span>
</span><span class='line'><span class="nt"></CORSConfiguration></span>
</span></code></pre></td></tr></table></div></figure>
<h3>參考資料</h3>
<p><a href="http://docs.aws.amazon.com/AmazonS3/latest/dev/cors.html" target="_blank">http://docs.aws.amazon.com/AmazonS3/latest/dev/cors.html</a></p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[安裝與設定 unicorn 實現佈署時 zero down time]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-06-03/unicorn-rails-and-capistrano/"/>
<updated>2013-06-03T11:27:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-06-03/unicorn-rails-and-capistrano</id>
<content type="html"><![CDATA[<p>本文章的 code 可參考公開的 pull request<br/>
<a href="https://github.com/5fpro/cupid/pull/11/files" target="_blank">https://github.com/5fpro/cupid/pull/11/files</a><br/>
這是基礎到不行的設定方式，考量到 server 效能在設定上的 best practice 將會在日後持續 update 本文。</p>
<!-- more -->
<h3>安裝 gem</h3>
<figure class='code'><figcaption><span>Gemfile</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">group</span> <span class="ss">:development</span> <span class="k">do</span>
</span><span class='line'> <span class="n">gem</span> <span class="s1">'capistrano-unicorn'</span><span class="p">,</span> <span class="ss">:require</span> <span class="o">=></span> <span class="kp">false</span>
</span><span class='line'><span class="k">end</span>
</span><span class='line'>
</span><span class='line'><span class="n">gem</span> <span class="s1">'unicorn'</span>
</span></code></pre></td></tr></table></div></figure>
<p>本文所採用的 gem 版本</p>
<figure class='code'><figcaption><span>Gemfile.lock</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">capistrano</span><span class="o">-</span><span class="n">unicorn</span> <span class="p">(</span><span class="mi">0</span><span class="o">.</span><span class="mi">1</span><span class="o">.</span><span class="mi">9</span><span class="p">)</span>
</span><span class='line'><span class="n">unicorn</span> <span class="p">(</span><span class="mi">4</span><span class="o">.</span><span class="mi">6</span><span class="o">.</span><span class="mi">2</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<h3>佈署設定</h3>
<p>這裡的 <code>production.rb</code> 是針對 <code>rails_env=production</code>，而非 capistrano 中 multistage 的 production</p>
<figure class='code'><figcaption><span>config/unicorn/production.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">worker_processes</span> <span class="mi">1</span>
</span><span class='line'><span class="n">preload_app</span> <span class="kp">true</span>
</span><span class='line'>
</span><span class='line'><span class="n">listen</span> <span class="s1">'/tmp/unicorn.cupid.sock'</span> <span class="c1"># sock 檔名可依照 app 需求設定</span>
</span><span class='line'>
</span><span class='line'><span class="n">stderr_path</span> <span class="s1">'log/unicorn.error.log'</span>
</span><span class='line'><span class="n">stdout_path</span> <span class="s1">'log/unicorn.log'</span>
</span><span class='line'>
</span><span class='line'><span class="n">pid</span> <span class="s2">"tmp/pids/unicorn.pid"</span>
</span><span class='line'>
</span><span class='line'><span class="n">rails_env</span> <span class="o">=</span> <span class="no">ENV</span><span class="o">[</span><span class="s1">'RAILS_ENV'</span><span class="o">]</span> <span class="o">||</span> <span class="s1">'production'</span>
</span><span class='line'>
</span><span class='line'><span class="c1"># before/after fork 可自行擴充</span>
</span><span class='line'>
</span><span class='line'><span class="n">before_fork</span> <span class="k">do</span> <span class="o">|</span><span class="n">server</span><span class="p">,</span> <span class="n">worker</span><span class="o">|</span>
</span><span class='line'><span class="k">end</span>
</span><span class='line'>
</span><span class='line'><span class="n">after_fork</span> <span class="k">do</span> <span class="o">|</span><span class="n">server</span><span class="p">,</span> <span class="n">worker</span><span class="o">|</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>(也可以把上述檔案放在 <code>config/unicorn.rb</code>)</p>
<h3>server 上的 nginx.conf</h3>
<figure class='code'><figcaption><span>nginx.conf</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
<span class='line-number'>21</span>
<span class='line-number'>22</span>
<span class='line-number'>23</span>
<span class='line-number'>24</span>
<span class='line-number'>25</span>
<span class='line-number'>26</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">upstream</span> <span class="n">my_app</span> <span class="p">{</span> <span class="c1"># upstream 名稱可自定</span>
</span><span class='line'> <span class="n">server</span> <span class="n">unix</span><span class="ss">:/</span><span class="n">tmp</span><span class="o">/</span><span class="n">unicorn</span><span class="o">.</span><span class="n">cupid</span><span class="o">.</span><span class="n">sock</span><span class="p">;</span> <span class="c1"># 這裡要和 config/unicorn/production.rb 中 listen 的設定對應</span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'>
</span><span class='line'><span class="n">server</span> <span class="p">{</span>
</span><span class='line'> <span class="n">listen</span> <span class="mi">80</span><span class="p">;</span>
</span><span class='line'> <span class="n">server_name</span> <span class="n">example</span><span class="o">.</span><span class="n">com</span><span class="p">;</span>
</span><span class='line'>
</span><span class='line'> <span class="c1"># passenger_enabled on; # 原本要設定 passenger 的記得要拿掉</span>
</span><span class='line'> <span class="c1"># .......</span>
</span><span class='line'>
</span><span class='line'> <span class="n">location</span> <span class="o">/</span> <span class="p">{</span>
</span><span class='line'> <span class="n">proxy_set_header</span> <span class="n">X</span><span class="o">-</span><span class="no">Real</span><span class="o">-</span><span class="no">IP</span> <span class="vg">$remote_addr</span><span class="p">;</span>
</span><span class='line'> <span class="n">proxy_set_header</span> <span class="n">X</span><span class="o">-</span><span class="no">Forwarded</span><span class="o">-</span><span class="no">For</span> <span class="vg">$proxy_add_x_forwarded_for</span><span class="p">;</span>
</span><span class='line'> <span class="n">proxy_set_header</span> <span class="no">Host</span> <span class="vg">$http_host</span><span class="p">;</span>
</span><span class='line'> <span class="n">proxy_pass</span> <span class="n">http</span><span class="ss">:/</span><span class="o">/</span><span class="n">my_app</span><span class="p">;</span> <span class="c1"># upstream 名稱</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'>
</span><span class='line'> <span class="n">location</span> <span class="o">~</span> <span class="o">^/</span><span class="p">(</span><span class="n">assets</span><span class="p">)</span><span class="o">/</span> <span class="p">{</span> <span class="c1"># 這裡是 precompile 後的 assets file 路徑</span>
</span><span class='line'> <span class="n">gzip_static</span> <span class="n">on</span><span class="p">;</span> <span class="c1"># to serve pre-gzipped version</span>
</span><span class='line'> <span class="n">expires</span> <span class="n">max</span><span class="p">;</span>
</span><span class='line'> <span class="n">add_header</span> <span class="no">Cache</span><span class="o">-</span><span class="no">Control</span> <span class="kp">public</span><span class="p">;</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'>
</span><span class='line'> <span class="c1"># .......</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<h3>把 unicorn 重啟的 hook 掛到 deploy.rb 中</h3>
<figure class='code'><figcaption><span>config/deploy.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="nb">require</span> <span class="s1">'capistrano-unicorn'</span>
</span><span class='line'><span class="n">after</span> <span class="s1">'deploy:restart'</span><span class="p">,</span> <span class="s1">'unicorn:restart'</span>
</span></code></pre></td></tr></table></div></figure>
<p>done!</p>
<h3>如何在本機測試 unicorn</h3>
<p><code>bundle exec unicorn</code></p>
<p>Go to http://localhost:8080</p>
<h3>參考資料</h3>
<ul>
<li>更多 unicorn 可以在 cap 指令中的應用: <a href="https://github.com/sosedoff/capistrano-unicorn/blob/master/lib/capistrano-unicorn/capistrano_integration.rb" target="_blank">https://github.com/sosedoff/capistrano-unicorn/blob/master/lib/capistrano-unicorn/capistrano_integration.rb</a></li>
<li>unicorn 設定檔說明: <a href="https://raw.github.com/defunkt/unicorn/master/examples/unicorn.conf.rb" target="_blank">https://raw.github.com/defunkt/unicorn/master/examples/unicorn.conf.rb</a></li>
<li>Github Blog 上說明他們自己的 unicorn 如何設定: <a href="https://github.com/blog/517-unicorn" target="_blank">https://github.com/blog/517-unicorn</a></li>
<li>其他 unicorn 設定相關教學:
<ul>
<li><a href="http://tech.gadii.net/blog/2013/03/07/rails-deploy-ji-chu-jiao-xue/" target="_blank">http://tech.gadii.net/blog/2013/03/07/rails-deploy-ji-chu-jiao-xue/</a></li>
<li><a href="https://devcenter.heroku.com/articles/rails-unicorn" target="_blank">https://devcenter.heroku.com/articles/rails-unicorn</a></li>
<li><a href="http://ruby-china.org/topics/471" target="_blank">http://ruby-china.org/topics/471</a></li>
</ul>
</li>
</ul>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[利用 Swagger 產生互動式 API 文件]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-05-04/swagger-api-doc-rails/"/>
<updated>2013-05-04T20:48:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-05-04/swagger-api-doc-rails</id>
<content type="html"><![CDATA[<p><a href="https://developers.helloreverb.com/swagger/" target="_blank">Swagger</a> 是一套由 HTML + Javascript 撰寫的 REST API 文件的框架。 (core 是以 scala 寫的)</p>
<!-- more -->
<p>從 <a href="http://petstore.swagger.wordnik.com/" target="_blank">Demo 頁</a> 可了解到 Swagger 不僅僅提供 API 的規格資訊，也提供互動介面讓開發者可以直接輸入參數進行測試。<br/>
<img src="http://i.imgur.com/a5vAGKz.png" /></p>
<p>亦支援 GET & POST 以外的 http method (PUT、DELETE)。</p>
<p><img src="http://i.imgur.com/L3c5TTt.png" /></p>
<p>Demo 頁面的 source code 在<a href="https://github.com/wordnik/swagger-ui" target="_blank"> Github </a>上。也可以參考 wordnik 的<a href="http://developer.wordnik.com/docs.html" target="_blank"> 官方正式 API 文件 </a>。</p>
<p>API 文件內容完全是透過 ajax 取得 JSON data 產生的，因此必須提供 server 吐出符合 Swagger 文件中所定義的 JSON 格式，讓前端網頁能夠生成 API 文件的介面。</p>
<p><img src="http://i.imgur.com/iC3LFIL.png" border="1" style="border-color:#000000" /></p>
<p>在 Swagger 文件中所定義的物件有:</p>
<ol>
<li><code>doc</code>: 代表整份 API 文件 (<a href="https://github.com/wordnik/swagger-core/wiki/Resource-Listing" target="_blank">規格文件</a>)</li>
<li><code>resource</code>: API 文件下的分類目錄 (<a href="https://github.com/wordnik/swagger-core/wiki/API-Declaration" target="_blank">規格文件</a>)</li>
<li><code>api</code>: 每一條 REST Request (<a href="https://github.com/wordnik/swagger-core/wiki/API-Declaration" target="_blank">規格文件</a>)</li>
<li><code>parameter</code>: <code>api</code> 下的每個參數 (<a href="https://github.com/wordnik/swagger-core/wiki/Parameters" target="_blank">規格文件</a>)</li>
<li><code>model</code>: 自訂的 return data type (<a href="https://github.com/wordnik/swagger-core/wiki/Datatypes" target="_blank">規格文件</a>)</li>
</ol>
<p>鑿於定義相當繁多且複雜，Swagger 本身有提供<a href="https://github.com/wordnik/swagger-codegen/tree/master/samples/server-generator" target="_blank">部分語言的 API 文件生成後台</a> (Ruby 開發者可選擇 sinatra)，讓開發者能夠花最少的時間開始使用 Swagger。</p>
<p>但筆者仍覺得 Swagger 使開發者進入狀況的門檻仍高，因此花了點時間以 rails app 開發 Swagger json data 的管理後台生成 swagger API 文件，提供後台的 web 操作介面來產生 Swagger 的 API 文件。</p>
<p>Github: <a href="https://github.com/marsz/swagger-rails" target="_blank">https://github.com/marsz/swagger-rails</a><br/>
Demo: <a href="http://swagger.5fpro.com/" target="_blank">http://swagger.5fpro.com/</a></p>
<p>功能特色:</p>
<ol>
<li>FB 登入/註冊，單一帳號下可建立多筆 <code>doc</code></li>
<li>自訂 API 實際測試的目標網域</li>
<li>可設定獨立網域 (FQDN)，若沒有設定系統也會自動產生一組給你用</li>
<li><code>resource</code> 可排序</li>
</ol>
<p>讓我們 step by step 來建立 API 文件吧。<br/>
範例是小弟在早期自己寫的 API，用來提供台灣縣市鄉鎮的資料庫。</p>
<ol>
<li>建立 <code>doc</code>，內容如下:<br/>
<img src="http://i.imgur.com/dM1Ori8.png" /></li>
<li>建立 <code>doc</code> 後，系統會提供你 API 實測時的網址格式<br/>
<img src="http://i.imgur.com/RNsHmMx.png" /></li>
<li>建立 <code>resource</code> (圖略)， <code>resource</code> 可以用來當做是管理許多 API 的目錄</li>
<li>建立 <code>api</code>: 選擇 http method 和 path<br/>
<img src="http://i.imgur.com/x9wfS0U.png" /><br/>
若 API 參數在 path 中，可用大括號包起來，必且給予參數名稱</li>
<li>填寫 return data type，若為某個 model 的 array 可以以圖內的格式表示<br/>
<img src="http://i.imgur.com/5TyRs6L.png" /></li>
<li>api path 內有參數的話，底下的 parameters 也必須增加 <code>parameter type</code> 為 <code>path</code> 的參數 (如圖)，名稱和大括號內對應<br/>
<img src="http://i.imgur.com/98IsmNe.png" /></li>
<li>有關 <code>model</code> 的定義，可在 doc 頁找到，這裡的定義與否不會影響文件的正常顯示，有定義的話文件也會顯示出來，內容也就更完整囉<br/>
<img src="http://i.imgur.com/F1vZR2E.png" /></li>
<li>點擊 doc information 內的連結即可看到結果(<a href="http://gaia-doc.5fpro.tw/#!/3/api_6_get_2" target="_blank">http://gaia-doc.5fpro.tw/#!/3/api_6_get_2</a>)<br/>
<img src="http://i.imgur.com/8x0rLQX.png" /></li>
<li>當然，API 實測要有資料，必須實作 <a href="http://gaia.5fpro.tw/cities/1.json" target="_blank">http://gaia.5fpro.tw/cities/1.json</a> 回傳的 JSON data 才行。</li>
</ol>
<p>目前的 swagger-rails 仍有許多待增加的功能:</p>
<ol>
<li>多人協作</li>
<li>修改記錄</li>
<li>自訂前端 CSS</li>
<li>後台介面優化</li>
<li>100% 實作 Swagger 所有支援的格式</li>
</ol>
<p>最後附上筆者目前正式對外開放的 API 文件給各位參考:</p>
<ol>
<li><a href="http://api-doc.thewall.tw/" target="_blank">THEWALL 這牆音樂</a></li>
<li><a href="http://gaia-doc.5fpro.tw/" target="_blank">台灣縣市鄉鎮資料庫</a>, 含郵遞區號</li>
<li><a href="http://medusa-doc.5fpro.com/" target="_blank">爬蟲系統</a> (暫不開放申請)</li>
</ol>
<p>筆者目前透過自己蓋的 <code>swagger-rails</code> 用於內部溝通居多，不論在 mobile app 開發或跨語言的資料傳遞，透過 Swagger 介面的 API 實測功能，使用者很快就可以了解每條 API 的取用方式與資料格式，大大減少了溝通的成本。</p>
<p>Swagger 參考資料:</p>
<ol>
<li><a href="https://github.com/wordnik/swagger-core/wiki" target="_blank">Swagger Specification</a></li>
<li><a href="https://github.com/wordnik/swagger-core/wiki/Downloads" target="_blank">Swagger Downloads</a></li>
<li><a href="https://developers.helloreverb.com/swagger/" target="_blank">Official Site</a></li>
</ol>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[server 端允許 ajax cross domain 存取]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-04-28/server-side-accept-cross-domain-ajax-request/"/>
<updated>2013-04-28T13:07:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-04-28/server-side-accept-cross-domain-ajax-request</id>
<content type="html"><![CDATA[<p>在 controller 中加入以下即可允許來自 cross domain 的 ajax request</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">response</span><span class="o">.</span><span class="n">headers</span><span class="o">[</span><span class="s2">"Access-Control-Allow-Origin"</span><span class="o">]</span> <span class="o">=</span> <span class="s2">"*"</span>
</span></code></pre></td></tr></table></div></figure>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Redis 在 Passenger 重起後出現 'reconnect to Redis after forking' 的錯誤訊息]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-04-13/redis-reconnect-after-fork/"/>
<updated>2013-04-13T22:02:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-04-13/redis-reconnect-after-fork</id>
<content type="html"><![CDATA[<p>自 <code>redis</code> 升級，每次透過 <code>capistrano</code> 佈署後，連線 server 都會噴出 “Tried to use a connection from a child process without reconnecting. You need to reconnect to Redis after forking.” 的錯誤訊息。</p>
<!-- more -->
<p>原因在於 <code>redis</code> 的 <a href="https://github.com/redis/redis-rb" target="_blank">client gem</a>。</p>
<p>因此必須在每次 passenger restart 後，也讓 redis client 進行重啓。可參考以下，必須於 initializer 或 application.rb 中執行。</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">if</span> <span class="n">defined?</span><span class="p">(</span><span class="no">PhusionPassenger</span><span class="p">)</span>
</span><span class='line'> <span class="no">PhusionPassenger</span><span class="o">.</span><span class="n">on_event</span><span class="p">(</span><span class="ss">:starting_worker_process</span><span class="p">)</span> <span class="k">do</span> <span class="o">|</span><span class="n">forked</span><span class="o">|</span>
</span><span class='line'> <span class="k">if</span> <span class="n">forked</span>
</span><span class='line'> <span class="no">Redis</span><span class="o">.</span><span class="n">current</span> <span class="o">=</span> <span class="no">Redis</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="ss">:host</span> <span class="o">=></span> <span class="s2">"127.0.0.1"</span><span class="p">,</span> <span class="ss">:port</span> <span class="o">=></span> <span class="mi">6379</span><span class="p">)</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>除了 <code>redis</code> 之外，其他透過 redis 應用的 gem 也都會有類似的問題，例如 <code>resque</code>、<code>redis-store</code>、<code>redis-object</code>、<code>sidekiq</code> 等。</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[新版的 git (1.7 以上) 在 merge 時預設不開編輯器的設定]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-04-09/git-merge-no-edit-default/"/>
<updated>2013-04-09T02:02:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-04-09/git-merge-no-edit-default</id>
<content type="html"><![CDATA[<p>打開你的 shell rc 例如 <code>~/.zshrc</code> 或 <code>~/bashrc</code><br/>
插入以下</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>export GIT_MERGE_AUTOEDIT=no</span></code></pre></td></tr></table></div></figure>
<!-- more -->
<p>之後 merge –no-ff 的指令就都會預設用 auto message 做 commit 啦<br/>
如果想要強制編輯時，可以用 –edit 參數</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>git merge branch_name --no-ff --edit</span></code></pre></td></tr></table></div></figure>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[修正 IE 無法透過 cross-domain AJAX 取得 JSON 物件]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-03-29/ie-jquery-ajax-jsonp-n-cross-domain-n-cache-control-public/"/>
<updated>2013-03-29T22:52:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-03-29/ie-jquery-ajax-jsonp-n-cross-domain-n-cache-control-public</id>
<content type="html"><![CDATA[<p>controller 中的 <code>respond_to</code> 可用來 return 指定的 format 供 JS 取用 API 資料<br/>
但很不幸的 IE 9 以下在透過 jquery 中的 getJSON 無法取得 return 的 json 物件。</p>
<!-- more -->
<p>server 端的 action</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">def</span> <span class="nf">index</span>
</span><span class='line'> <span class="n">response</span><span class="o">.</span><span class="n">headers</span><span class="o">[</span><span class="s2">"Access-Control-Allow-Origin"</span><span class="o">]</span> <span class="o">=</span> <span class="s2">"*"</span>
</span><span class='line'> <span class="n">expires_in</span> <span class="mi">1</span><span class="o">.</span><span class="n">day</span><span class="p">,</span> <span class="ss">:public</span> <span class="o">=></span> <span class="kp">true</span>
</span><span class='line'> <span class="vi">@data</span> <span class="o">=</span> <span class="no">SomeModel</span><span class="o">.</span><span class="n">all</span>
</span><span class='line'> <span class="n">respond_to</span> <span class="k">do</span> <span class="o">|</span><span class="n">f</span><span class="o">|</span>
</span><span class='line'> <span class="n">f</span><span class="o">.</span><span class="n">json</span><span class="p">{</span> <span class="n">render</span> <span class="ss">:json</span> <span class="o">=></span> <span class="vi">@data</span> <span class="p">}</span>
</span><span class='line'> <span class="n">f</span><span class="o">.</span><span class="n">xml</span><span class="p">{</span> <span class="n">render</span> <span class="ss">:xml</span> <span class="o">=></span> <span class="vi">@data</span> <span class="p">}</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>client 端的 javascript</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class='javascript'><span class='line'><span class="nx">$</span><span class="p">.</span><span class="nx">getJSON</span><span class="p">(</span><span class="s2">"http://apihost.com/products.json"</span><span class="p">,</span><span class="s2">"jsonp"</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">products</span><span class="p">){</span>
</span><span class='line'> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">products</span><span class="p">);</span>
</span><span class='line'><span class="p">});</span>
</span></code></pre></td></tr></table></div></figure>
<p>結果: IE9 以下不 work，其他瀏覽器沒問題(生氣)</p>
<p>解決此問題的方法必須例用 jquery jsonp callback 的方式達到目的即可<br/>
因此 server 端的 response 的 content-type 必須是 javascript (見 <a href="http://d.pr/i/66d0" target="_blank">此圖</a>)</p>
<p>server 端寫法</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="k">def</span> <span class="nf">index</span>
</span><span class='line'> <span class="n">response</span><span class="o">.</span><span class="n">headers</span><span class="o">[</span><span class="s2">"Access-Control-Allow-Origin"</span><span class="o">]</span> <span class="o">=</span> <span class="s2">"*"</span>
</span><span class='line'> <span class="n">expires_in</span> <span class="mi">1</span><span class="o">.</span><span class="n">day</span><span class="p">,</span> <span class="ss">:public</span> <span class="o">=></span> <span class="kp">true</span>
</span><span class='line'> <span class="vi">@data</span> <span class="o">=</span> <span class="no">SomeModel</span><span class="o">.</span><span class="n">all</span>
</span><span class='line'> <span class="n">respond_to</span> <span class="k">do</span> <span class="o">|</span><span class="n">f</span><span class="o">|</span>
</span><span class='line'> <span class="n">f</span><span class="o">.</span><span class="n">json</span><span class="p">{</span> <span class="n">render</span> <span class="ss">:json</span> <span class="o">=></span> <span class="vi">@data</span> <span class="p">}</span>
</span><span class='line'> <span class="n">f</span><span class="o">.</span><span class="n">xml</span><span class="p">{</span> <span class="n">render</span> <span class="ss">:xml</span> <span class="o">=></span> <span class="vi">@data</span> <span class="p">}</span>
</span><span class='line'> <span class="n">f</span><span class="o">.</span><span class="n">js</span><span class="p">{</span> <span class="ss">:json</span> <span class="o">=></span> <span class="vi">@data</span><span class="p">,</span> <span class="ss">:callback</span> <span class="o">=></span> <span class="n">params</span><span class="o">[</span><span class="ss">:callback</span><span class="o">]</span> <span class="p">}</span>
</span><span class='line'> <span class="k">end</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<p>client 端的 javascript</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class='javascript'><span class='line'><span class="nx">$</span><span class="p">.</span><span class="nx">getJSON</span><span class="p">(</span><span class="s2">"http://apihost.com/products.js?callback=?"</span><span class="p">,</span><span class="kd">function</span><span class="p">(</span><span class="nx">data</span><span class="p">){</span>
</span><span class='line'> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">data</span><span class="p">);</span>
</span><span class='line'><span class="p">});</span>
</span></code></pre></td></tr></table></div></figure>
<p>搞定!!!</p>
<p>server 端其他寫法的補充:</p>
<p>開啟 cross-domain 的 ajax request</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">response</span><span class="o">.</span><span class="n">headers</span><span class="o">[</span><span class="s2">"Access-Control-Allow-Origin"</span><span class="o">]</span> <span class="o">=</span> <span class="s2">"*"</span>
</span></code></pre></td></tr></table></div></figure>
<p>開啟 cache-control 為 public:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">expires_in</span> <span class="mi">1</span><span class="o">.</span><span class="n">day</span><span class="p">,</span> <span class="ss">:public</span> <span class="o">=></span> <span class="kp">true</span>
</span></code></pre></td></tr></table></div></figure>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[我寫的 gem - venus 簡介]]></title>
<link href="http://rubyist.marsz.tw/blog/2013-03-13/rubygems-venus/"/>
<updated>2013-03-13T13:12:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2013-03-13/rubygems-venus</id>
<content type="html"><![CDATA[<p>因受到了<a href="http://railsapps.github.com/rails-composer/" target="_blank"> rails composor </a> 的影響，決定也來寫一個客製化的 rails generator。<br/>
但後來又覺得只能在開新專案用的話，使用頻率也不太高…</p>
<!-- more -->
<p>鑿於在許多專案中，總是為了要安裝某些 gem 而必須再回去翻寫過專案中的 code 或上官網找範例 code 做 copy/paste + 修改，於是我決定寫一個 generator 來設定這些常用的 gem，僅需要如同 rails composor 一樣回答一些問題就可以把所有的設定弄到好。</p>
<p>因此 venus 因應而生</p>
<p>安裝: <a href="https://rubygems.org/gems/venus" target="_blank">https://rubygems.org/gems/venus</a> <br/>
源碼: <a href="https://github.com/marsz/venus" target="_blank">https://github.com/marsz/venus</a></p>
<p>以下逐一介紹各個指令</p>
<p><code>rails generate venus:init</code></p>
<p>專案初始化設定，例如移除 public/index.html，安裝必要的 gem 例如分頁用的 <code>kminari</code>，剛 new 好的 rails 專案適合執行此指令。</p>
<p><code>rails generate venus:mysql</code></p>
<p>設定 mysql，包含從 <code>Gemfile</code> 安裝 mysql2，設定 <code>database.yml</code> 以及 <code>database.yml.example</code>，最後再將 <code>config/database.yml</code> 加到 .gitignore 中。</p>
<p><code>rails generate venus:paginate</code></p>
<p>單獨安裝分頁用的 gem - <code>kminari</code>，也會問你要不要產生客製化的 view 出來。</p>
<p><code>rails generate venus:simple_form</code></p>
<p>view 使用 form 必備的 <a href="https://github.com/plataformatec/simple_form" target="_blank">simple_form</a>，預設會產生 bootstrap wrapper 的設定檔。也會詢問是否要順便安裝 <a href="https://github.com/ryanb/nested_form" target="_blank">nested_form</a>，安裝 nested_form 需要在 js 中 require gem 裡面包好的 JS，所以也會詢問 require code 和 example code 要放的檔案路徑。</p>
<p><code>rails generate venus:settingslogic</code></p>
<p>gem - <a href="https://github.com/binarylogic/settingslogic" target="_blank"><code>settingslogic</code></a>。可以將多個 yml 的設定檔放在此 gem 所讀取的 yaml 下，使其能夠容易管理。此 generator 同時也會產生 .example 檔以及加入 .yml 到 .gitignore 下。</p>
<p><code>rails generate venus:rspec</code></p>
<p>安裝並且設定 <code>rspec</code>，並且移除 test 目錄，在 <code>config/application.rb</code> 中設定 generate controller 時，不自動產生 assets files 和 helper。</p>
<p><code>rails generate venus:devise</code></p>
<p>安裝並且設定 scope 為 user 的 devise gem。</p>
<p><code>rails generate venus:omniauth</code></p>
<p>會先檢查是否有安裝 settingslogic 以及 devise，然後再安裝 omniauth，過程中會詢問 facebook / twitter / github 登入的安裝與否。</p>
<p><code>rails generate venus:redis</code></p>
<p>安裝並且設定 redis client gem <a href="https://github.com/redis/redis-rb" target="_blank">redis-rb</a> 。</p>
<p><code>rails generate venus:aws</code></p>
<p>安裝並且設定 Amazon <a href="https://github.com/aws/aws-sdk-ruby" target="_blank">官方的 ruby client </a>。過程中會先檢查 settingslogic，並且將 api key 和 secret 存到其中。最後也會詢問否需要順便安裝 Amazon Simple Email Service (SES)，用來發 email。</p>
<p><code>rails generate venus:carrierwave</code></p>
<p>安裝並且設定 carrierwave，其中包含 rmagick 進行縮圖，以及 fog 將檔案上傳至S3。過程中會安裝 aws-sdk，所以也會順便詢問 SES 的設定 :p。最後會產生一個 <code>venus_uploader.rb</code> 做為範例。</p>
<p><code>rails generate venus:jqueryui</code></p>
<p>安裝 jquery ui 的 gem。其中會詢問是否要安裝 datepicker，包含產生 trigger 用的 js 範例 code。gem 的 參考連結 => <a href="https://github.com/joliss/jquery-ui-rails" target="_blank">https://github.com/joliss/jquery-ui-rails</a>。 (若有要安裝 datepicker 的話，也會詢問語系)</p>
<p><code>rails generate venus:chosen</code></p>
<p>安裝 <a href="https://github.com/tsechingho/chosen-rails" target="_blank">chosen-rails</a> 並且提供 trigger chosen 的範例 js code。</p>
<p><code>rails generate venus:bootstrap</code></p>
<p>安裝 <code>twitter bootstrap</code> ，包含 gem 設定、 assets require，最後產生範例 layout 檔於 <code>app/views/layouts/</code> 下。內建提供 <a href="http://wrapbootstrap.com/preview/WB0F35928" target="_blank">unicorn admin</a> 的版型套用，蓋後台超爽 XD</p>
<h1>TODOs</h1>
<p>對於此 gem 未來將會逐漸加入我自己寫的 best practice :p 也望各位大大能不吝指教或回報 bug :D</p>
<ul>
<li>sidekiq : 強大的 background job gem</li>
<li>unicorn : 配合 capistrano 讓佈署時可以 zero down time</li>
<li><a href="https://github.com/airblade/paper_trail" target="_blank">paper_trail</a> : 對 model 進行版本控制的 gem</li>
</ul>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[自動化產生 ER 圖的 rubygem]]></title>
<link href="http://rubyist.marsz.tw/blog/2012-11-13/auto-generate-erd-graph/"/>
<updated>2012-11-13T05:39:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2012-11-13/auto-generate-erd-graph</id>
<content type="html"><![CDATA[<p>參考連結:<br/>
1. 官網 : <a href="http://rails-erd.rubyforge.org/" target="_blank">http://rails-erd.rubyforge.org/</a><br/>
2. 相關教學 : <a href="http://zool.me/rails/2010/12/29/Rails-generate-entity-relationship-diagram-projects/" target="_blank">http://zool.me/rails/2010/12/29/Rails-generate-entity-relationship-diagram-projects/</a></p>
<!-- more -->
<h3>系統需求</h3>
<p>MAC OS 請先安裝 <code>brew</code></p>
<h3>安裝 Graphviz</h3>
<h5>MAC OS</h5>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>brew install cairo pango graphviz</span></code></pre></td></tr></table></div></figure>
<p>若無法順利安裝可至 <a href="http://www.graphviz.org/Download_macos.php" target="_blank">graphviz for MAC OS download</a> 頁面下載對應的系統，直接打開 finder 以 window 介面安裝</p>
<h5>Ubuntu</h5>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>sudo aptitude install graphviz</span></code></pre></td></tr></table></div></figure>
<h3>Rails 設定</h3>
<h5>Gemfile</h5>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">group</span> <span class="ss">:development</span> <span class="k">do</span>
</span><span class='line'> <span class="n">gem</span> <span class="s2">"rails-erd"</span>
</span><span class='line'><span class="k">end</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">bundle</span> <span class="n">install</span>
</span></code></pre></td></tr></table></div></figure>
<h3>生成 ERD</h3>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">bundle</span> <span class="nb">exec</span> <span class="n">rake</span> <span class="n">erd</span>
</span></code></pre></td></tr></table></div></figure>
<p>生成的 ERD 會在專案目錄下的 erd.pdf</p>
]]></content>
</entry>
<entry>
<title type="html"><![CDATA[Rubygems 處理 Amazon Web Service (AWS) EC2]]></title>
<link href="http://rubyist.marsz.tw/blog/2012-11-09/rubygeems-for-aws-ec2/"/>
<updated>2012-11-09T13:55:00+08:00</updated>
<id>http://rubyist.marsz.tw/blog/2012-11-09/rubygeems-for-aws-ec2</id>
<content type="html"><![CDATA[<p>參考: <a href="https://github.com/grempe/amazon-ec2" target="_blank">https://github.com/grempe/amazon-ec2</a></p>
<!-- more -->
<h3>安裝設定</h3>
<figure class='code'><figcaption><span>Gemfile</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">gem</span> <span class="s1">'amazon-ec2'</span><span class="p">,</span> <span class="ss">:require</span> <span class="o">=></span> <span class="s2">"AWS"</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span>config/aws.yml</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class='yaml'><span class='line'><span class="l-Scalar-Plain">development</span><span class="p-Indicator">:</span> <span class="nl">&default</span>
</span><span class='line'> <span class="l-Scalar-Plain">:access_key_id</span><span class="p-Indicator">:</span> <span class="s">"abcdabcd"</span>
</span><span class='line'> <span class="l-Scalar-Plain">:secret_access_key</span><span class="p-Indicator">:</span> <span class="s">"abcdabcd"</span>
</span><span class='line'> <span class="l-Scalar-Plain">:host</span><span class="p-Indicator">:</span> <span class="s">"ap-southeast-1.ec2.amazonaws.com"</span>
</span><span class='line'><span class="l-Scalar-Plain">test</span><span class="p-Indicator">:</span>
</span><span class='line'> <span class="l-Scalar-Plain"><<</span><span class="p-Indicator">:</span> <span class="nv">*default</span>
</span></code></pre></td></tr></table></div></figure>
<p><code>access_key_id</code> 和 <code>secret_access_key</code> 可至 <a href="https://portal.aws.amazon.com/gp/aws/developer/account/index.html?action=access-key" target="_blank">AWS Security Credentials</a> 查看<br/>
<code>host</code> 則是目標 region 所對應的 endpoint，對應表可至 <a href="https://github.com/garnaat/missingcloud/blob/master/aws.json#L372" target="_blank">https://github.com/garnaat/missingcloud/blob/master/aws.json#L372</a> 查看</p>
<p>養成好習慣, 請勿將 yaml 檔 commit 進去…</p>
<figure class='code'><figcaption><span>.gitignore</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">config</span><span class="o">/</span><span class="n">aws</span><span class="o">.</span><span class="n">yml</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span>config/aws.yml.example</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
</pre></td><td class='code'><pre><code class='yaml'><span class='line'><span class="c1"># to see region and host mapping :</span>
</span><span class='line'><span class="c1"># https://github.com/garnaat/missingcloud/blob/master/aws.json#L372</span>
</span><span class='line'><span class="l-Scalar-Plain">development</span><span class="p-Indicator">:</span> <span class="nl">&default</span>
</span><span class='line'> <span class="l-Scalar-Plain">:access_key_id</span><span class="p-Indicator">:</span> <span class="s">""</span>
</span><span class='line'> <span class="l-Scalar-Plain">:secret_access_key</span><span class="p-Indicator">:</span> <span class="s">""</span>
</span><span class='line'> <span class="l-Scalar-Plain">:host</span><span class="p-Indicator">:</span> <span class="s">""</span>
</span><span class='line'><span class="l-Scalar-Plain">test</span><span class="p-Indicator">:</span>
</span><span class='line'> <span class="l-Scalar-Plain"><<</span><span class="p-Indicator">:</span> <span class="nv">*default</span>
</span></code></pre></td></tr></table></div></figure>
<h3>使用方法</h3>
<ul>
<li>初始化</li>
</ul>
<figure class='code'><figcaption><span>example.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">config</span> <span class="o">=</span> <span class="no">YAML</span><span class="o">::</span><span class="nb">load</span><span class="p">(</span><span class="no">File</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s2">"</span><span class="si">#{</span><span class="no">Rails</span><span class="o">.</span><span class="n">root</span><span class="si">}</span><span class="s2">/config/aws.yml"</span><span class="p">))</span><span class="o">[</span><span class="no">Rails</span><span class="o">.</span><span class="n">env</span><span class="o">]</span>
</span><span class='line'><span class="n">ec2</span> <span class="o">=</span> <span class="no">AWS</span><span class="o">::</span><span class="no">EC2</span><span class="o">::</span><span class="no">Base</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="ss">:access_key_id</span> <span class="o">=></span> <span class="n">config</span><span class="o">[</span><span class="ss">:access_key_id</span><span class="o">]</span><span class="p">,</span> <span class="ss">:secret_access_key</span> <span class="o">=></span> <span class="n">config</span><span class="o">[</span><span class="ss">:secret_access_key</span><span class="o">]</span><span class="p">,</span> <span class="ss">:server</span> <span class="o">=></span> <span class="n">config</span><span class="o">[</span><span class="ss">:host</span><span class="o">]</span><span class="p">)</span>
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>取得 instance 列表</li>
</ul>
<figure class='code'><figcaption><span>exmaple.rb</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
</pre></td><td class='code'><pre><code class='ruby'><span class='line'><span class="n">instances</span> <span class="o">=</span> <span class="n">ec2</span><span class="o">.</span><span class="n">describe_instances</span>
</span><span class='line'><span class="c1"># instances["reservationSet"]["item"] 才會取得 array</span>
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>取得所有 snapshots (自己 create 的)</li>
</ul>