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<!DOCTYPE html>
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<h1>worker.rb</h1>
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<div class="content"><div class='highlight'><pre><span class="keyword">require</span> <span class="string">'time'</span>
<span class="keyword">require</span> <span class="string">'rack/utils'</span></pre></div></div>
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<h1>Worker</h1>
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<div class="content"><div class='highlight'><pre><span class="class"><span class="keyword">module</span> <span class="title">Spyglass</span></span>
<span class="class"><span class="keyword">class</span> <span class="title">Worker</span></span>
<span class="keyword">include</span> <span class="constant">Logging</span>
<span class="function"><span class="keyword">def</span> <span class="title">initialize</span><span class="params">(socket, app, writable_pipe, connection = <span class="keyword">nil</span>)</span></span>
<span class="variable">@socket</span>, <span class="variable">@app</span>, <span class="variable">@writable_pipe</span> = socket, app, writable_pipe
<span class="variable">@parser</span> = <span class="constant">Spyglass::HttpParser</span>.new
handle_connection(connection) <span class="keyword">if</span> connection
<span class="keyword">end</span>
<span class="function"><span class="keyword">def</span> <span class="title">start</span></span>
trap_signals
loop <span class="keyword">do</span>
handle_connection <span class="variable">@socket</span>.accept
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="function"><span class="keyword">def</span> <span class="title">handle_connection</span><span class="params">(conn)</span></span>
verbose <span class="string">"Received connection"</span></pre></div></div>
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<p>This notifies our Master that we have received a connection, expiring
it's <code>IO.select</code> and preventing it from timing out.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="variable">@writable_pipe</span>.write_nonblock(<span class="string">'.'</span>)</pre></div></div>
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<p>This clears any state that the http parser has lying around
from the last connection that was handled.</p>
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<div class="content"><div class='highlight'><pre> <span class="variable">@parser</span>.reset</pre></div></div>
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<p>The Rack spec requires that 'rack.input' be encoded as ASCII-8BIT.</p>
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<div class="content"><div class='highlight'><pre> empty_body = <span class="string">''</span>
empty_body.encode!(<span class="constant">Encoding::ASCII_8BIT</span>) <span class="keyword">if</span> empty_body.respond_to?(<span class="symbol">:encode!</span>)</pre></div></div>
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<p>The Rack spec requires that the env contain certain keys before being
passed to the app. These are the keys that aren't provided by each
incoming request, server-specific stuff.</p>
</div>
<div class="content"><div class='highlight'><pre> env = {
<span class="string">'rack.input'</span> => <span class="constant">StringIO</span>.new(empty_body),
<span class="string">'rack.multithread'</span> => <span class="keyword">false</span>,
<span class="string">'rack.multiprocess'</span> => <span class="keyword">true</span>,
<span class="string">'rack.run_once'</span> => <span class="keyword">false</span>,
<span class="string">'rack.errors'</span> => <span class="constant">STDERR</span>,
<span class="string">'rack.version'</span> => [<span class="number">1</span>, <span class="number">0</span>]
}</pre></div></div>
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<p>This reads data in from the client connection. We'll read up to
10000 bytes at the moment.</p>
</div>
<div class="content"><div class='highlight'><pre> data = conn.readpartial(<span class="number">10000</span>)</pre></div></div>
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<p>Here we pass the data and the env into the http parser. It parses
the raw http request data and updates the env with all of the data
it can withdraw.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="variable">@parser</span>.execute(env, data, <span class="number">0</span>)</pre></div></div>
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<p>Call the Rack app, goes all the way down the rabbit hole and back again.</p>
</div>
<div class="content"><div class='highlight'><pre> status, headers, body = <span class="variable">@app</span>.call(env)</pre></div></div>
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<p>These are the default headers we always include in a response. We
only speak HTTP 1.1 and we always close the client connection. At
the monment keepalive is not supported.</p>
</div>
<div class="content"><div class='highlight'><pre> head = <span class="string">"HTTP/1.1 <span class="subst">#{status}</span>\r\n"</span> \
<span class="string">"Date: <span class="subst">#{<span class="constant">Time</span>.now.httpdate}</span>\r\n"</span> \
<span class="string">"Status: <span class="subst">#{<span class="constant">Rack::Utils::HTTP_STATUS_CODES</span>[status]}</span>\r\n"</span> \
<span class="string">"Connection: close\r\n"</span>
headers.each <span class="keyword">do</span> |k,v|
head << <span class="string">"<span class="subst">#{k}</span>: <span class="subst">#{v}</span>\r\n"</span>
<span class="keyword">end</span>
conn.write <span class="string">"<span class="subst">#{head}</span>\r\n"</span>
body.each { |chunk| conn.write chunk }
body.close <span class="keyword">if</span> body.respond_to?(<span class="symbol">:close</span>)</pre></div></div>
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<p>Since keepalive is not supported we can close the client connection
immediately after writing the body.</p>
</div>
<div class="content"><div class='highlight'><pre> conn.close
verbose <span class="string">"Closed connection"</span>
<span class="keyword">end</span>
<span class="function"><span class="keyword">def</span> <span class="title">trap_signals</span></span>
trap(<span class="symbol">:QUIT</span>) <span class="keyword">do</span>
out <span class="string">"Received QUIT"</span>
exit
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="keyword">end</span></pre></div></div>
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