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<title>Class: Rack::ShowExceptions</title>
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<div id="classHeader">
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<td><strong>Class</strong></td>
<td class="class-name-in-header">Rack::ShowExceptions</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../files/lib/rack/showexceptions_rb.html">
lib/rack/showexceptions.rb
</a>
<br />
</td>
</tr>
<tr class="top-aligned-row">
<td><strong>Parent:</strong></td>
<td>
Object
</td>
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<p>
<a href="ShowExceptions.html">Rack::ShowExceptions</a> catches all
exceptions raised from the app it wraps. It shows a useful backtrace with
the sourcefile and clickable context, the whole <a
href="../Rack.html">Rack</a> environment and the request data.
</p>
<p>
Be careful when you use this on public-facing sites as it could reveal
information helpful to attackers.
</p>
</div>
</div>
<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000086">call</a>
<a href="#M000085">new</a>
<a href="#M000087">pretty</a>
</div>
</div>
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<h3 class="section-bar">Constants</h3>
<div class="name-list">
<table summary="Constants">
<tr class="top-aligned-row context-row">
<td class="context-item-name">CONTEXT</td>
<td>=</td>
<td class="context-item-value">7</td>
</tr>
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<h3 class="section-bar">Public Class methods</h3>
<div id="method-M000085" class="method-detail">
<a name="M000085"></a>
<div class="method-heading">
<a href="#M000085" class="method-signature">
<span class="method-name">new</span><span class="method-args">(app)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000085-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000085-source">
<pre>
<span class="ruby-comment cmt"># File lib/rack/showexceptions.rb, line 17</span>
17: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">app</span>)
18: <span class="ruby-ivar">@app</span> = <span class="ruby-identifier">app</span>
19: <span class="ruby-ivar">@template</span> = <span class="ruby-constant">ERB</span>.<span class="ruby-identifier">new</span>(<span class="ruby-constant">TEMPLATE</span>)
20: <span class="ruby-keyword kw">end</span>
</pre>
</div>
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</div>
<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000086" class="method-detail">
<a name="M000086"></a>
<div class="method-heading">
<a href="#M000086" class="method-signature">
<span class="method-name">call</span><span class="method-args">(env)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000086-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000086-source">
<pre>
<span class="ruby-comment cmt"># File lib/rack/showexceptions.rb, line 22</span>
22: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
23: <span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
24: <span class="ruby-keyword kw">rescue</span> <span class="ruby-constant">StandardError</span>, <span class="ruby-constant">LoadError</span>, <span class="ruby-constant">SyntaxError</span> =<span class="ruby-operator">></span> <span class="ruby-identifier">e</span>
25: <span class="ruby-identifier">backtrace</span> = <span class="ruby-identifier">pretty</span>(<span class="ruby-identifier">env</span>, <span class="ruby-identifier">e</span>)
26: [<span class="ruby-value">500</span>,
27: {<span class="ruby-value str">"Content-Type"</span> =<span class="ruby-operator">></span> <span class="ruby-value str">"text/html"</span>,
28: <span class="ruby-value str">"Content-Length"</span> =<span class="ruby-operator">></span> <span class="ruby-identifier">backtrace</span>.<span class="ruby-identifier">join</span>.<span class="ruby-identifier">size</span>.<span class="ruby-identifier">to_s</span>},
29: <span class="ruby-identifier">backtrace</span>]
30: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000087" class="method-detail">
<a name="M000087"></a>
<div class="method-heading">
<a href="#M000087" class="method-signature">
<span class="method-name">pretty</span><span class="method-args">(env, exception)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000087-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000087-source">
<pre>
<span class="ruby-comment cmt"># File lib/rack/showexceptions.rb, line 32</span>
32: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">pretty</span>(<span class="ruby-identifier">env</span>, <span class="ruby-identifier">exception</span>)
33: <span class="ruby-identifier">req</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Request</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">env</span>)
34: <span class="ruby-identifier">path</span> = (<span class="ruby-identifier">req</span>.<span class="ruby-identifier">script_name</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">req</span>.<span class="ruby-identifier">path_info</span>).<span class="ruby-identifier">squeeze</span>(<span class="ruby-value str">"/"</span>)
35:
36: <span class="ruby-identifier">frames</span> = <span class="ruby-identifier">exception</span>.<span class="ruby-identifier">backtrace</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">line</span><span class="ruby-operator">|</span>
37: <span class="ruby-identifier">frame</span> = <span class="ruby-constant">OpenStruct</span>.<span class="ruby-identifier">new</span>
38: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">line</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(.*?):(\d+)(:in `(.*)')?/</span>
39: <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">filename</span> = <span class="ruby-identifier">$1</span>
40: <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">lineno</span> = <span class="ruby-identifier">$2</span>.<span class="ruby-identifier">to_i</span>
41: <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">function</span> = <span class="ruby-identifier">$4</span>
42:
43: <span class="ruby-keyword kw">begin</span>
44: <span class="ruby-identifier">lineno</span> = <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">lineno</span><span class="ruby-operator">-</span><span class="ruby-value">1</span>
45: <span class="ruby-identifier">lines</span> = <span class="ruby-operator">::</span><span class="ruby-constant">File</span>.<span class="ruby-identifier">readlines</span>(<span class="ruby-identifier">frame</span>.<span class="ruby-identifier">filename</span>)
46: <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">pre_context_lineno</span> = [<span class="ruby-identifier">lineno</span><span class="ruby-operator">-</span><span class="ruby-constant">CONTEXT</span>, <span class="ruby-value">0</span>].<span class="ruby-identifier">max</span>
47: <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">pre_context</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-identifier">frame</span>.<span class="ruby-identifier">pre_context_lineno</span><span class="ruby-operator">...</span><span class="ruby-identifier">lineno</span>]
48: <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">context_line</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-identifier">lineno</span>].<span class="ruby-identifier">chomp</span>
49: <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">post_context_lineno</span> = [<span class="ruby-identifier">lineno</span><span class="ruby-operator">+</span><span class="ruby-constant">CONTEXT</span>, <span class="ruby-identifier">lines</span>.<span class="ruby-identifier">size</span>].<span class="ruby-identifier">min</span>
50: <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">post_context</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-identifier">lineno</span><span class="ruby-operator">+</span><span class="ruby-value">1</span><span class="ruby-operator">..</span><span class="ruby-identifier">frame</span>.<span class="ruby-identifier">post_context_lineno</span>]
51: <span class="ruby-keyword kw">rescue</span>
52: <span class="ruby-keyword kw">end</span>
53:
54: <span class="ruby-identifier">frame</span>
55: <span class="ruby-keyword kw">else</span>
56: <span class="ruby-keyword kw">nil</span>
57: <span class="ruby-keyword kw">end</span>
58: }.<span class="ruby-identifier">compact</span>
59:
60: <span class="ruby-identifier">env</span>[<span class="ruby-value str">"rack.errors"</span>].<span class="ruby-identifier">puts</span> <span class="ruby-node">"#{exception.class}: #{exception.message}"</span>
61: <span class="ruby-identifier">env</span>[<span class="ruby-value str">"rack.errors"</span>].<span class="ruby-identifier">puts</span> <span class="ruby-identifier">exception</span>.<span class="ruby-identifier">backtrace</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">l</span><span class="ruby-operator">|</span> <span class="ruby-value str">"\t"</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">l</span> }
62: <span class="ruby-identifier">env</span>[<span class="ruby-value str">"rack.errors"</span>].<span class="ruby-identifier">flush</span>
63:
64: [<span class="ruby-ivar">@template</span>.<span class="ruby-identifier">result</span>(<span class="ruby-identifier">binding</span>)]
65: <span class="ruby-keyword kw">end</span>
</pre>
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