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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>class Rack::Cascade - rack-2.2.10 Documentation</title> <script type="text/javascript"> var rdoc_rel_prefix = "../"; var index_rel_prefix = "../"; </script> <script src="../js/navigation.js" defer></script> <script src="../js/search.js" defer></script> <script src="../js/search_index.js" defer></script> <script src="../js/searcher.js" defer></script> <script src="../js/darkfish.js" defer></script> <link href="../css/fonts.css" rel="stylesheet"> <link href="../css/rdoc.css" rel="stylesheet"> <body id="top" role="document" class="class"> <nav role="navigation"> <div id="project-navigation"> <div id="home-section" role="region" title="Quick navigation" class="nav-section"> <h2> <a href="../index.html" rel="home">Home</a> </h2> <div id="table-of-contents-navigation"> <a href="../table_of_contents.html#pages">Pages</a> <a href="../table_of_contents.html#classes">Classes</a> <a href="../table_of_contents.html#methods">Methods</a> </div> </div> <div id="search-section" role="search" class="project-section initially-hidden"> <form action="#" method="get" accept-charset="utf-8"> <div id="search-field-wrapper"> <input id="search-field" role="combobox" aria-label="Search" aria-autocomplete="list" aria-controls="search-results" type="text" name="search" placeholder="Search" spellcheck="false" title="Type to search, Up and Down to navigate, Enter to load"> </div> <ul id="search-results" aria-label="Search Results" aria-busy="false" aria-expanded="false" aria-atomic="false" class="initially-hidden"></ul> </form> </div> </div> <div id="class-metadata"> <div id="parent-class-section" class="nav-section"> <h3>Parent</h3> <p class="link">Object </div> <!-- Method Quickref --> <div id="method-list-section" class="nav-section"> <h3>Methods</h3> <ul class="link-list" role="directory"> <li ><a href="#method-c-new">::new</a> <li ><a href="#method-i-3C-3C">#<<</a> <li ><a href="#method-i-add">#add</a> <li ><a href="#method-i-call">#call</a> <li ><a href="#method-i-include-3F">#include?</a> </ul> </div> </div> </nav> <main role="main" aria-labelledby="class-Rack::Cascade"> <h1 id="class-Rack::Cascade" class="class"> class Rack::Cascade </h1> <section class="description"> <p><a href="Cascade.html"><code>Rack::Cascade</code></a> tries a request on several apps, and returns the first response that is not 404 or 405 (or in a list of configured status codes). If all applications tried return one of the configured status codes, return the last response.</p> </section> <section id="5Buntitled-5D" class="documentation-section"> <section class="constants-list"> <header> <h3>Constants</h3> </header> <dl> <dt id="NotFound">NotFound <dd><p>deprecated, no longer used</p> </dl> </section> <section class="attribute-method-details" class="method-section"> <header> <h3>Attributes</h3> </header> <div id="attribute-i-apps" class="method-detail"> <div class="method-heading attribute-method-heading"> <span class="method-name">apps</span><span class="attribute-access-type">[R]</span> </div> <div class="method-description"> <p>An array of applications to try in order.</p> </div> </div> </section> <section id="public-class-5Buntitled-5D-method-details" class="method-section"> <header> <h3>Public Class Methods</h3> </header> <div id="method-c-new" class="method-detail "> <div class="method-heading"> <span class="method-name">new</span><span class="method-args">(apps, cascade_for = [404, 405])</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Set the apps to send requests to, and what statuses result in cascading. Arguments:</p> <p>apps: An enumerable of rack applications. cascade_for: The statuses to use cascading for. If a response is received</p> <pre>from an app, the next app is tried.</pre> <div class="method-source-code" id="new-source"> <pre><span class="ruby-comment"># File lib/rack/cascade.rb, line 22</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">apps</span>, <span class="ruby-identifier">cascade_for</span> = [<span class="ruby-value">404</span>, <span class="ruby-value">405</span>]) <span class="ruby-ivar">@apps</span> = [] <span class="ruby-identifier">apps</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">app</span><span class="ruby-operator">|</span> <span class="ruby-identifier">add</span> <span class="ruby-identifier">app</span> } <span class="ruby-ivar">@cascade_for</span> = {} [<span class="ruby-operator">*</span><span class="ruby-identifier">cascade_for</span>].<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">status</span><span class="ruby-operator">|</span> <span class="ruby-ivar">@cascade_for</span>[<span class="ruby-identifier">status</span>] = <span class="ruby-keyword">true</span> } <span class="ruby-keyword">end</span></pre> </div> </div> </div> </section> <section id="public-instance-5Buntitled-5D-method-details" class="method-section"> <header> <h3>Public Instance Methods</h3> </header> <div id="method-i-3C-3C" class="method-detail method-alias"> <div class="method-heading"> <span class="method-name"><<</span><span class="method-args">(app)</span> </div> <div class="method-description"> </div> <div class="aliases"> Alias for: <a href="Cascade.html#method-i-add">add</a> </div> </div> <div id="method-i-add" class="method-detail "> <div class="method-heading"> <span class="method-name">add</span><span class="method-args">(app)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Append an app to the list of apps to cascade. This app will be tried last.</p> <div class="method-source-code" id="add-source"> <pre><span class="ruby-comment"># File lib/rack/cascade.rb, line 57</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">add</span>(<span class="ruby-identifier">app</span>) <span class="ruby-ivar">@apps</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">app</span> <span class="ruby-keyword">end</span></pre> </div> </div> <div class="aliases"> Also aliased as: <a href="Cascade.html#method-i-3C-3C"><<</a> </div> </div> <div id="method-i-call" class="method-detail "> <div class="method-heading"> <span class="method-name">call</span><span class="method-args">(env)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Call each app in order. If the responses uses a status that requires cascading, try the next app. If all responses require cascading, return the response from the last app.</p> <div class="method-source-code" id="call-source"> <pre><span class="ruby-comment"># File lib/rack/cascade.rb, line 33</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">call</span>(<span class="ruby-identifier">env</span>) <span class="ruby-keyword">return</span> [<span class="ruby-value">404</span>, { <span class="ruby-constant">CONTENT_TYPE</span> <span class="ruby-operator">=></span> <span class="ruby-string">"text/plain"</span> }, []] <span class="ruby-keyword">if</span> <span class="ruby-ivar">@apps</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-identifier">result</span> = <span class="ruby-keyword">nil</span> <span class="ruby-identifier">last_body</span> = <span class="ruby-keyword">nil</span> <span class="ruby-ivar">@apps</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">app</span><span class="ruby-operator">|</span> <span class="ruby-comment"># The SPEC says that the body must be closed after it has been iterated</span> <span class="ruby-comment"># by the server, or if it is replaced by a middleware action. Cascade</span> <span class="ruby-comment"># replaces the body each time a cascade happens. It is assumed that nil</span> <span class="ruby-comment"># does not respond to close, otherwise the previous application body</span> <span class="ruby-comment"># will be closed. The final application body will not be closed, as it</span> <span class="ruby-comment"># will be passed to the server as a result.</span> <span class="ruby-identifier">last_body</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">last_body</span>.<span class="ruby-identifier">respond_to?</span> <span class="ruby-value">:close</span> <span class="ruby-identifier">result</span> = <span class="ruby-identifier">app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>) <span class="ruby-keyword">return</span> <span class="ruby-identifier">result</span> <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@cascade_for</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">result</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">to_i</span>) <span class="ruby-identifier">last_body</span> = <span class="ruby-identifier">result</span>[<span class="ruby-value">2</span>] <span class="ruby-keyword">end</span> <span class="ruby-identifier">result</span> <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-include-3F" class="method-detail "> <div class="method-heading"> <span class="method-name">include?</span><span class="method-args">(app)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Whether the given app is one of the apps to cascade to.</p> <div class="method-source-code" id="include-3F-source"> <pre><span class="ruby-comment"># File lib/rack/cascade.rb, line 62</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">include?</span>(<span class="ruby-identifier">app</span>) <span class="ruby-ivar">@apps</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">app</span>) <span class="ruby-keyword">end</span></pre> </div> </div> </div> </section> </section> </main> <footer id="validator-badges" role="contentinfo"> <p><a href="https://validator.w3.org/check/referer">Validate</a> <p>Generated by <a href="https://ruby.github.io/rdoc/">RDoc</a> 6.2.1.1. <p>Based on <a href="http://deveiate.org/projects/Darkfish-RDoc/">Darkfish</a> by <a href="http://deveiate.org">Michael Granger</a>. </footer>
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