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<pre><a name="line-1"></a><span class='hs-comment'>{- arch-tag: Generic Server Support
<a name="line-2"></a>Copyright (C) 2004 John Goerzen <jgoerzen@complete.org>
<a name="line-3"></a>
<a name="line-4"></a>This program is free software; you can redistribute it and/or modify
<a name="line-5"></a>it under the terms of the GNU General Public License as published by
<a name="line-6"></a>the Free Software Foundation; either version 2 of the License, or
<a name="line-7"></a>(at your option) any later version.
<a name="line-8"></a>
<a name="line-9"></a>This program is distributed in the hope that it will be useful,
<a name="line-10"></a>but WITHOUT ANY WARRANTY; without even the implied warranty of
<a name="line-11"></a>MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
<a name="line-12"></a>GNU General Public License for more details.
<a name="line-13"></a>
<a name="line-14"></a>You should have received a copy of the GNU General Public License
<a name="line-15"></a>along with this program; if not, write to the Free Software
<a name="line-16"></a>Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
<a name="line-17"></a>-}</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-comment'>{- |
<a name="line-20"></a> Module : Network.SocketServer
<a name="line-21"></a> Copyright : Copyright (C) 2004-2006 John Goerzen
<a name="line-22"></a> License : GNU GPL, version 2 or above
<a name="line-23"></a>
<a name="line-24"></a> Maintainer : John Goerzen <jgoerzen@complete.org>
<a name="line-25"></a> Stability : experimental
<a name="line-26"></a> Portability: systems with networking
<a name="line-27"></a>
<a name="line-28"></a>This module provides an infrastructure to simplify server design.
<a name="line-29"></a>
<a name="line-30"></a>Written by John Goerzen, jgoerzen\@complete.org
<a name="line-31"></a>
<a name="line-32"></a>Please note: this module is designed to work with TCP, UDP, and Unix domain
<a name="line-33"></a>sockets, but only TCP sockets have been tested to date.
<a name="line-34"></a>
<a name="line-35"></a>This module is presently under-documented. For an example of usage, please
<a name="line-36"></a>see the description of "Network.FTP.Server".
<a name="line-37"></a>-}</span>
<a name="line-38"></a>
<a name="line-39"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>SocketServer</span><span class='hs-layout'>(</span><span class='hs-comment'>-- * Generic Options and Types</span>
<a name="line-40"></a> <span class='hs-conid'>InetServerOptions</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-41"></a> <span class='hs-varid'>simpleTCPOptions</span><span class='hs-layout'>,</span>
<a name="line-42"></a> <span class='hs-conid'>SocketServer</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-43"></a> <span class='hs-conid'>HandlerT</span><span class='hs-layout'>,</span>
<a name="line-44"></a> <span class='hs-comment'>-- * TCP server convenient setup</span>
<a name="line-45"></a> <span class='hs-varid'>serveTCPforever</span><span class='hs-layout'>,</span>
<a name="line-46"></a> <span class='hs-comment'>-- * Lower-Level Processing</span>
<a name="line-47"></a> <span class='hs-varid'>setupSocketServer</span><span class='hs-layout'>,</span>
<a name="line-48"></a> <span class='hs-varid'>handleOne</span><span class='hs-layout'>,</span>
<a name="line-49"></a> <span class='hs-varid'>serveForever</span><span class='hs-layout'>,</span>
<a name="line-50"></a> <span class='hs-varid'>closeSocketServer</span><span class='hs-layout'>,</span>
<a name="line-51"></a> <span class='hs-comment'>-- * Combinators</span>
<a name="line-52"></a> <span class='hs-varid'>loggingHandler</span><span class='hs-layout'>,</span>
<a name="line-53"></a> <span class='hs-varid'>threadedHandler</span><span class='hs-layout'>,</span>
<a name="line-54"></a> <span class='hs-varid'>handleHandler</span>
<a name="line-55"></a> <span class='hs-layout'>)</span>
<a name="line-56"></a><span class='hs-keyword'>where</span>
<a name="line-57"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span>
<a name="line-58"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>BSD</span>
<a name="line-59"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span>
<a name="line-60"></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-61"></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-62"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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>
<a name="line-63"></a>
<a name="line-64"></a><a name="InetServerOptions"></a><span class='hs-comment'>{- | Options for your server. -}</span>
<a name="line-65"></a><a name="InetServerOptions"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>InetServerOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>InetServerOptions</span> <span class='hs-layout'>{</span><span class='hs-varid'>listenQueueSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span>
<a name="line-66"></a> <span class='hs-varid'>portNumber</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PortNumber</span><span class='hs-layout'>,</span>
<a name="line-67"></a> <span class='hs-varid'>interface</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HostAddress</span><span class='hs-layout'>,</span>
<a name="line-68"></a> <span class='hs-varid'>reuse</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>,</span>
<a name="line-69"></a> <span class='hs-varid'>family</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Family</span><span class='hs-layout'>,</span>
<a name="line-70"></a> <span class='hs-varid'>sockType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SocketType</span><span class='hs-layout'>,</span>
<a name="line-71"></a> <span class='hs-varid'>protoStr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-72"></a> <span class='hs-layout'>}</span>
<a name="line-73"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="HandlerT"></a><span class='hs-comment'>{- | The main handler type.
<a name="line-76"></a>
<a name="line-77"></a>The first parameter is the socket itself.
<a name="line-78"></a>
<a name="line-79"></a>The second is the address of the remote endpoint.
<a name="line-80"></a>
<a name="line-81"></a>The third is the address of the local endpoint.
<a name="line-82"></a>-}</span>
<a name="line-83"></a><a name="HandlerT"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>HandlerT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Socket</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SockAddr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SockAddr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="simpleTCPOptions"></a><span class='hs-comment'>{- | Get Default options. You can always modify it later. -}</span>
<a name="line-86"></a><span class='hs-definition'>simpleTCPOptions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Port Number</span>
<a name="line-87"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>InetServerOptions</span>
<a name="line-88"></a><span class='hs-definition'>simpleTCPOptions</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>InetServerOptions</span> <span class='hs-layout'>{</span><span class='hs-varid'>listenQueueSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>5</span><span class='hs-layout'>,</span>
<a name="line-89"></a> <span class='hs-varid'>portNumber</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-90"></a> <span class='hs-varid'>interface</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iNADDR_ANY</span><span class='hs-layout'>,</span>
<a name="line-91"></a> <span class='hs-varid'>reuse</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span><span class='hs-layout'>,</span>
<a name="line-92"></a> <span class='hs-varid'>family</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AF_INET</span><span class='hs-layout'>,</span>
<a name="line-93"></a> <span class='hs-varid'>sockType</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span><span class='hs-layout'>,</span>
<a name="line-94"></a> <span class='hs-varid'>protoStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"tcp"</span>
<a name="line-95"></a> <span class='hs-layout'>}</span>
<a name="line-96"></a>
<a name="line-97"></a><a name="SocketServer"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>SocketServer</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SocketServer</span> <span class='hs-layout'>{</span><span class='hs-varid'>optionsSS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>InetServerOptions</span><span class='hs-layout'>,</span>
<a name="line-98"></a> <span class='hs-varid'>sockSS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span><span class='hs-layout'>}</span>
<a name="line-99"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-100"></a>
<a name="line-101"></a><a name="setupSocketServer"></a><span class='hs-comment'>{- | Takes some options and sets up the 'SocketServer'. I will bind
<a name="line-102"></a>and begin listening, but will not accept any connections itself. -}</span>
<a name="line-103"></a><span class='hs-definition'>setupSocketServer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>InetServerOptions</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>SocketServer</span>
<a name="line-104"></a><span class='hs-definition'>setupSocketServer</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>=</span>
<a name="line-105"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>proto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProtocolNumber</span> <span class='hs-layout'>(</span><span class='hs-varid'>protoStr</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span>
<a name="line-106"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>socket</span> <span class='hs-layout'>(</span><span class='hs-varid'>family</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>sockType</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-varid'>proto</span>
<a name="line-107"></a> <span class='hs-varid'>setSocketOption</span> <span class='hs-varid'>s</span> <span class='hs-conid'>ReuseAddr</span> <span class='hs-layout'>(</span><span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>reuse</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-108"></a> <span class='hs-conid'>True</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>1</span>
<a name="line-109"></a> <span class='hs-conid'>False</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-110"></a> <span class='hs-varid'>bindSocket</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-layout'>(</span><span class='hs-varid'>portNumber</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-layout'>(</span><span class='hs-varid'>interface</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-112"></a> <span class='hs-varid'>listen</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-varid'>listenQueueSize</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span>
<a name="line-113"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>SocketServer</span> <span class='hs-layout'>{</span><span class='hs-varid'>optionsSS</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>opts</span><span class='hs-layout'>,</span> <span class='hs-varid'>sockSS</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span><span class='hs-layout'>}</span>
<a name="line-114"></a>
<a name="line-115"></a><a name="closeSocketServer"></a><span class='hs-comment'>{- | Close the socket server. Does not terminate active
<a name="line-116"></a>handlers, if any. -}</span>
<a name="line-117"></a><span class='hs-definition'>closeSocketServer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SocketServer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-118"></a><span class='hs-definition'>closeSocketServer</span> <span class='hs-varid'>ss</span> <span class='hs-keyglyph'>=</span>
<a name="line-119"></a> <span class='hs-varid'>sClose</span> <span class='hs-layout'>(</span><span class='hs-varid'>sockSS</span> <span class='hs-varid'>ss</span><span class='hs-layout'>)</span>
<a name="line-120"></a>
<a name="line-121"></a><a name="handleOne"></a><span class='hs-comment'>{- | Handle one incoming request from the given 'SocketServer'. -}</span>
<a name="line-122"></a><span class='hs-definition'>handleOne</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SocketServer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HandlerT</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-123"></a><span class='hs-definition'>handleOne</span> <span class='hs-varid'>ss</span> <span class='hs-varid'>func</span> <span class='hs-keyglyph'>=</span>
<a name="line-124"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionsSS</span> <span class='hs-varid'>ss</span><span class='hs-layout'>)</span>
<a name="line-125"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>accept</span> <span class='hs-layout'>(</span><span class='hs-varid'>sockSS</span> <span class='hs-varid'>ss</span><span class='hs-layout'>)</span>
<a name="line-126"></a> <span class='hs-varid'>localaddr</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getSocketName</span> <span class='hs-layout'>(</span><span class='hs-varid'>fst</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-127"></a> <span class='hs-varid'>func</span> <span class='hs-layout'>(</span><span class='hs-varid'>fst</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>snd</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>localaddr</span>
<a name="line-128"></a>
<a name="line-129"></a><a name="serveForever"></a><span class='hs-comment'>{- | Handle all incoming requests from the given 'SocketServer'. -}</span>
<a name="line-130"></a><span class='hs-definition'>serveForever</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SocketServer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HandlerT</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-131"></a><span class='hs-definition'>serveForever</span> <span class='hs-varid'>ss</span> <span class='hs-varid'>func</span> <span class='hs-keyglyph'>=</span>
<a name="line-132"></a> <span class='hs-varid'>sequence_</span> <span class='hs-layout'>(</span><span class='hs-varid'>repeat</span> <span class='hs-layout'>(</span><span class='hs-varid'>handleOne</span> <span class='hs-varid'>ss</span> <span class='hs-varid'>func</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-133"></a>
<a name="line-134"></a><a name="serveTCPforever"></a><span class='hs-comment'>{- | Convenience function to completely set up a TCP
<a name="line-135"></a>'SocketServer' and handle all incoming requests.
<a name="line-136"></a>
<a name="line-137"></a>This function is literally this:
<a name="line-138"></a>
<a name="line-139"></a>>serveTCPforever options func =
<a name="line-140"></a>> do sockserv <- setupSocketServer options
<a name="line-141"></a>> serveForever sockserv func
<a name="line-142"></a> -}</span>
<a name="line-143"></a><span class='hs-definition'>serveTCPforever</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>InetServerOptions</span> <span class='hs-comment'>-- ^ Server options</span>
<a name="line-144"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HandlerT</span> <span class='hs-comment'>-- ^ Handler function</span>
<a name="line-145"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-146"></a><span class='hs-definition'>serveTCPforever</span> <span class='hs-varid'>options</span> <span class='hs-varid'>func</span> <span class='hs-keyglyph'>=</span>
<a name="line-147"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>sockserv</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>setupSocketServer</span> <span class='hs-varid'>options</span>
<a name="line-148"></a> <span class='hs-varid'>serveForever</span> <span class='hs-varid'>sockserv</span> <span class='hs-varid'>func</span>
<a name="line-149"></a>
<a name="line-150"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-151"></a><span class='hs-comment'>-- Combinators</span>
<a name="line-152"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-153"></a>
<a name="line-154"></a><span class='hs-comment'>{- | Log each incoming connection using the interface in
<a name="line-155"></a>"System.Log.Logger".
<a name="line-156"></a>
<a name="line-157"></a>Log when the incoming connection disconnects.
<a name="line-158"></a>
<a name="line-159"></a>Also, log any failures that may occur in the child handler. -}</span>
<a name="line-160"></a>
<a name="line-161"></a><a name="loggingHandler"></a><span class='hs-definition'>loggingHandler</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Name of logger to use</span>
<a name="line-162"></a> <span class='hs-keyglyph'>-></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-varop'>.</span><span class='hs-conid'>Priority</span> <span class='hs-comment'>-- ^ Priority of logged messages</span>
<a name="line-163"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HandlerT</span> <span class='hs-comment'>-- ^ Handler to call after logging</span>
<a name="line-164"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HandlerT</span> <span class='hs-comment'>-- ^ Resulting handler</span>
<a name="line-165"></a><span class='hs-definition'>loggingHandler</span> <span class='hs-varid'>hname</span> <span class='hs-varid'>prio</span> <span class='hs-varid'>nexth</span> <span class='hs-varid'>socket</span> <span class='hs-varid'>r_sockaddr</span> <span class='hs-varid'>l_sockaddr</span> <span class='hs-keyglyph'>=</span>
<a name="line-166"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>sockStr</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>showSockAddr</span> <span class='hs-varid'>r_sockaddr</span>
<a name="line-167"></a> <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-varop'>.</span><span class='hs-varid'>logM</span> <span class='hs-varid'>hname</span> <span class='hs-varid'>prio</span>
<a name="line-168"></a> <span class='hs-layout'>(</span><span class='hs-str'>"Received connection from "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>sockStr</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <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-varop'>.</span><span class='hs-varid'>traplogging</span> <span class='hs-varid'>hname</span>
<a name="line-170"></a> <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-varop'>.</span><span class='hs-conid'>WARNING</span> <span class='hs-str'>""</span> <span class='hs-layout'>(</span><span class='hs-varid'>nexth</span> <span class='hs-varid'>socket</span> <span class='hs-varid'>r_sockaddr</span>
<a name="line-171"></a> <span class='hs-varid'>l_sockaddr</span><span class='hs-layout'>)</span>
<a name="line-172"></a> <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-varop'>.</span><span class='hs-varid'>logM</span> <span class='hs-varid'>hname</span> <span class='hs-varid'>prio</span>
<a name="line-173"></a> <span class='hs-layout'>(</span><span class='hs-str'>"Connection "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>sockStr</span> <span class='hs-varop'>++</span> <span class='hs-str'>" disconnected"</span><span class='hs-layout'>)</span>
<a name="line-174"></a>
<a name="line-175"></a>
<a name="line-176"></a><a name="threadedHandler"></a><span class='hs-comment'>-- | Handle each incoming connection in its own thread to</span>
<a name="line-177"></a><span class='hs-comment'>-- make the server multi-tasking.</span>
<a name="line-178"></a><span class='hs-definition'>threadedHandler</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HandlerT</span> <span class='hs-comment'>-- ^ Handler to call in the new thread</span>
<a name="line-179"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HandlerT</span> <span class='hs-comment'>-- ^ Resulting handler</span>
<a name="line-180"></a><span class='hs-definition'>threadedHandler</span> <span class='hs-varid'>nexth</span> <span class='hs-varid'>socket</span> <span class='hs-varid'>r_sockaddr</span> <span class='hs-varid'>l_sockaddr</span><span class='hs-keyglyph'>=</span>
<a name="line-181"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>forkIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>nexth</span> <span class='hs-varid'>socket</span> <span class='hs-varid'>r_sockaddr</span> <span class='hs-varid'>l_sockaddr</span><span class='hs-layout'>)</span>
<a name="line-182"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-183"></a>
<a name="line-184"></a><a name="handleHandler"></a><span class='hs-comment'>{- | Give your handler function a Handle instead of a Socket.
<a name="line-185"></a>
<a name="line-186"></a>The Handle will be opened with ReadWriteMode (you use one handle for both
<a name="line-187"></a>directions of the Socket). Also, it will be initialized with LineBuffering.
<a name="line-188"></a>
<a name="line-189"></a>Unlike other handlers, the handle will be closed when the function returns.
<a name="line-190"></a>Therefore, if you are doing threading, you should to it before you call this
<a name="line-191"></a>handler.
<a name="line-192"></a>-}</span>
<a name="line-193"></a><span class='hs-definition'>handleHandler</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SockAddr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SockAddr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Handler to call</span>
<a name="line-194"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HandlerT</span>
<a name="line-195"></a><span class='hs-definition'>handleHandler</span> <span class='hs-varid'>func</span> <span class='hs-varid'>socket</span> <span class='hs-varid'>r_sockaddr</span> <span class='hs-varid'>l_sockaddr</span> <span class='hs-keyglyph'>=</span>
<a name="line-196"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>socket</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-197"></a> <span class='hs-varid'>hSetBuffering</span> <span class='hs-varid'>h</span> <span class='hs-conid'>LineBuffering</span>
<a name="line-198"></a> <span class='hs-varid'>func</span> <span class='hs-varid'>h</span> <span class='hs-varid'>r_sockaddr</span> <span class='hs-varid'>l_sockaddr</span>
<a name="line-199"></a> <span class='hs-varid'>hClose</span> <span class='hs-varid'>h</span>
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