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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances, ScopedTypeVariables #-}</span>
<a name="line-2"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>--</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : IDE.Utils.Server</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : 2007-2011 Juergen Nicklisch-Franken, Hamish Mackenzie</span>
<a name="line-6"></a><span class='hs-comment'>-- License : GPL</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : maintainer@leksah.org</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability :</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- |</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>IDE</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span><span class='hs-varop'>.</span><span class='hs-conid'>Server</span>
<a name="line-17"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>ipAddress</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Server</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>serveOne</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>serveMany</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>ServerRoutine</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>UserAndGroup</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>WaitFor</span> <span class='hs-layout'>(</span><span class='hs-varid'>waitFor</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-keyword'>where</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>accept</span><span class='hs-layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>E</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Log</span><span class='hs-varop'>.</span><span class='hs-conid'>Logger</span> <span class='hs-layout'>(</span><span class='hs-varid'>infoM</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="UserAndGroup"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>UserAndGroup</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>UserAndGroup</span> <span class='hs-conid'>String</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>UserWithDefaultGroup</span> <span class='hs-conid'>String</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="setUserAndGroup"></a><span class='hs-comment'>-- | Set the user and group for the process. If the group is Nothing, then use the users default group.</span>
<a name="line-39"></a><span class='hs-comment'>-- This is especially useful when you are root and want to become a user.</span>
<a name="line-40"></a><span class='hs-definition'>setUserAndGroup</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>UserAndGroup</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-41"></a><span class='hs-definition'>setUserAndGroup</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="ipAddress"></a><span class='hs-comment'>-- | make an IP Address: (127,0,0,1) is the localhost</span>
<a name="line-44"></a><span class='hs-definition'>ipAddress</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word8</span><span class='hs-layout'>,</span> <span class='hs-conid'>Word8</span><span class='hs-layout'>,</span> <span class='hs-conid'>Word8</span><span class='hs-layout'>,</span> <span class='hs-conid'>Word8</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HostAddress</span>
<a name="line-45"></a><span class='hs-definition'>ipAddress</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>a</span> <span class='hs-varop'>+</span> <span class='hs-num'>0x100</span> <span class='hs-varop'>*</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>b</span> <span class='hs-varop'>+</span> <span class='hs-num'>0x10000</span> <span class='hs-varop'>*</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>c</span> <span class='hs-varop'>+</span> <span class='hs-num'>0x1000000</span> <span class='hs-varop'>*</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>d</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="ServerRoutine"></a><span class='hs-comment'>-- | the functionality of a server</span>
<a name="line-48"></a><a name="ServerRoutine"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>ServerRoutine</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span><span class='hs-layout'>,</span> <span class='hs-conid'>HostName</span><span class='hs-layout'>,</span> <span class='hs-conid'>PortNumber</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="serverSocket'"></a><span class='hs-definition'>serverSocket'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Server</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Socket</span>
<a name="line-51"></a><span class='hs-definition'>serverSocket'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Server</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>socket</span> <span class='hs-conid'>AF_INET</span> <span class='hs-varid'>t</span> <span class='hs-varid'>defaultProtocol</span>
<a name="line-52"></a><span class='hs-definition'>serverSocket'</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Unexpected Socket Address Type"</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="serverSocket"></a><span class='hs-definition'>serverSocket</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Server</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Socket</span><span class='hs-layout'>,</span> <span class='hs-conid'>Server</span><span class='hs-layout'>)</span>
<a name="line-55"></a><span class='hs-definition'>serverSocket</span> <span class='hs-varid'>server</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-56"></a> <span class='hs-varid'>sock</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>serverSocket'</span> <span class='hs-varid'>server</span>
<a name="line-57"></a> <span class='hs-varid'>setSocketOption</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReuseAddr</span> <span class='hs-num'>1</span>
<a name="line-58"></a> <span class='hs-varid'>bindSocket</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-varid'>serverAddr</span> <span class='hs-varid'>server</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-varid'>infoM</span> <span class='hs-str'>"leksah-server"</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-str'>"Bind "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>serverAddr</span> <span class='hs-varid'>server</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-varid'>listen</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>maxListenQueue</span>
<a name="line-61"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>sock</span><span class='hs-layout'>,</span> <span class='hs-varid'>server</span><span class='hs-layout'>)</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="Server"></a><span class='hs-comment'>-- |the specification of a serving process</span>
<a name="line-64"></a><a name="Server"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Server</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Server</span> <span class='hs-layout'>{</span>
<a name="line-65"></a> <span class='hs-varid'>serverAddr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SockAddr</span><span class='hs-layout'>,</span>
<a name="line-66"></a> <span class='hs-varid'>serverTyp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SocketType</span><span class='hs-layout'>,</span>
<a name="line-67"></a> <span class='hs-varid'>serverRoutine</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ServerRoutine</span><span class='hs-layout'>}</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="startAccepting"></a><span class='hs-definition'>startAccepting</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Socket</span><span class='hs-layout'>,</span> <span class='hs-conid'>Server</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThreadId</span><span class='hs-layout'>,</span> <span class='hs-conid'>MVar</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-70"></a><span class='hs-definition'>startAccepting</span> <span class='hs-layout'>(</span><span class='hs-varid'>sock</span><span class='hs-layout'>,</span> <span class='hs-varid'>server</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-71"></a> <span class='hs-varid'>mvar</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newEmptyMVar</span>
<a name="line-72"></a> <span class='hs-varid'>threadId</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>forkIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>acceptance</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-varid'>serverRoutine</span> <span class='hs-varid'>server</span><span class='hs-layout'>)</span> <span class='hs-varop'>`finally`</span> <span class='hs-varid'>putMVar</span> <span class='hs-varid'>mvar</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>threadId</span><span class='hs-layout'>,</span> <span class='hs-varid'>mvar</span><span class='hs-layout'>)</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="serveMany"></a><span class='hs-definition'>serveMany</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>UserAndGroup</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Server</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>ThreadId</span><span class='hs-layout'>,</span> <span class='hs-conid'>MVar</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-76"></a><span class='hs-definition'>serveMany</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>userAndGroup</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-77"></a> <span class='hs-varid'>ready</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>serverSocket</span> <span class='hs-varid'>l</span>
<a name="line-78"></a> <span class='hs-varid'>setUserAndGroup</span> <span class='hs-varid'>userAndGroup</span>
<a name="line-79"></a> <span class='hs-varid'>mapM</span> <span class='hs-varid'>startAccepting</span> <span class='hs-varid'>ready</span>
<a name="line-80"></a><span class='hs-definition'>serveMany</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>serverSocket</span> <span class='hs-varid'>l</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>startAccepting</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="serveOne"></a><span class='hs-definition'>serveOne</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>UserAndGroup</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Server</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThreadId</span><span class='hs-layout'>,</span> <span class='hs-conid'>MVar</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-83"></a><span class='hs-definition'>serveOne</span> <span class='hs-varid'>ug</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-84"></a> <span class='hs-varid'>l</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>serveMany</span> <span class='hs-varid'>ug</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span><span class='hs-keyglyph'>]</span>
<a name="line-85"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-86"></a>
<a name="line-87"></a><a name="WaitFor"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>WaitFor</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-88"></a> <span class='hs-varid'>waitFor</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-89"></a>
<a name="line-90"></a><a name="instance%20WaitFor%20(MVar%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>WaitFor</span> <span class='hs-layout'>(</span><span class='hs-conid'>MVar</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-91"></a> <span class='hs-varid'>waitFor</span> <span class='hs-varid'>mvar</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readMVar</span> <span class='hs-varid'>mvar</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-92"></a>
<a name="line-93"></a><a name="instance%20WaitFor%20%5ba%5d"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>WaitFor</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>WaitFor</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>where</span>
<a name="line-94"></a> <span class='hs-varid'>waitFor</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapM_</span> <span class='hs-varid'>waitFor</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="instance%20WaitFor%20(ThreadId,%20MVar%20())"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>WaitFor</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThreadId</span><span class='hs-layout'>,</span> <span class='hs-conid'>MVar</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-97"></a> <span class='hs-varid'>waitFor</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>mvar</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>waitFor</span> <span class='hs-varid'>mvar</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="acceptance"></a><span class='hs-definition'>acceptance</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ServerRoutine</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-100"></a><span class='hs-definition'>acceptance</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span>
<a name="line-101"></a> <span class='hs-varid'>dta</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>accept</span> <span class='hs-varid'>sock</span>
<a name="line-102"></a> <span class='hs-varid'>forkIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>action</span> <span class='hs-varid'>dta</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SomeException</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>print</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span>
<a name="line-104"></a> <span class='hs-varid'>acceptance</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>action</span>
<a name="line-105"></a>
<a name="line-106"></a>
<a name="line-107"></a>
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