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<pre><a name="line-1"></a><span class='hs-comment'>-- | Some useful functions if you want to wrap the 'ServerPartT' monad transformer around the 'ErrorT' monad transformer. e.g., @'ServerPartT' ('ErrorT' e m) a@. This allows you to use 'throwError' and 'catchError' inside your monad. </span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Happstack</span><span class='hs-varop'>.</span><span class='hs-conid'>Server</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-keyword'>where</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span><span class='hs-layout'>,</span> <span class='hs-conid'>ErrorT</span><span class='hs-layout'>(</span><span class='hs-varid'>runErrorT</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Happstack</span><span class='hs-varop'>.</span><span class='hs-conid'>Server</span><span class='hs-varop'>.</span><span class='hs-conid'>Monads</span> <span class='hs-layout'>(</span><span class='hs-conid'>ServerPartT</span><span class='hs-layout'>)</span>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Happstack</span><span class='hs-varop'>.</span><span class='hs-conid'>Server</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Monads</span> <span class='hs-layout'>(</span><span class='hs-conid'>WebT</span><span class='hs-layout'>,</span> <span class='hs-conid'>UnWebT</span><span class='hs-layout'>,</span> <span class='hs-varid'>withRequest</span><span class='hs-layout'>,</span> <span class='hs-varid'>mkWebT</span><span class='hs-layout'>,</span> <span class='hs-varid'>runServerPartT</span><span class='hs-layout'>,</span> <span class='hs-varid'>ununWebT</span><span class='hs-layout'>)</span>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Happstack</span><span class='hs-varop'>.</span><span class='hs-conid'>Server</span><span class='hs-varop'>.</span><span class='hs-conid'>Response</span> <span class='hs-layout'>(</span><span class='hs-varid'>ok</span><span class='hs-layout'>,</span> <span class='hs-varid'>toResponse</span><span class='hs-layout'>)</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Happstack</span><span class='hs-varop'>.</span><span class='hs-conid'>Server</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-layout'>(</span><span class='hs-conid'>Request</span><span class='hs-layout'>,</span> <span class='hs-conid'>Response</span><span class='hs-layout'>)</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-comment'>--------------------------------------------------------------</span>
<a name="line-11"></a><span class='hs-comment'>-- Error Handling</span>
<a name="line-12"></a><span class='hs-comment'>--------------------------------------------------------------</span>
<a name="line-13"></a>
<a name="line-14"></a><a name="spUnwrapErrorT"></a><span class='hs-comment'>-- | Flatten @'ServerPartT' ('ErrorT' e m) a@ into a @'ServerPartT' m</span>
<a name="line-15"></a><span class='hs-comment'>-- a@ so that it can be use with 'simpleHTTP'. Used with</span>
<a name="line-16"></a><span class='hs-comment'>-- 'mapServerPartT'', e.g.,</span>
<a name="line-17"></a><span class='hs-comment'>--</span>
<a name="line-18"></a><span class='hs-comment'>-- > simpleHTTP conf $ mapServerPartT' (spUnWrapErrorT simpleErrorHandler) $ myPart `catchError` errorPart</span>
<a name="line-19"></a><span class='hs-comment'>--</span>
<a name="line-20"></a><span class='hs-comment'>-- Note that in this example, @simpleErrorHandler@ will only be run if @errorPart@ throws an error. You can replace @simpleErrorHandler@ with your own custom error handler.</span>
<a name="line-21"></a><span class='hs-comment'>--</span>
<a name="line-22"></a><span class='hs-comment'>-- see also: 'simpleErrorHandler'</span>
<a name="line-23"></a><span class='hs-definition'>spUnwrapErrorT</span><span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</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'>ServerPartT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-24"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Request</span>
<a name="line-25"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>UnWebT</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-26"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>UnWebT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-27"></a><span class='hs-definition'>spUnwrapErrorT</span> <span class='hs-varid'>handler</span> <span class='hs-varid'>rq</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-28"></a> <span class='hs-varid'>err</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runErrorT</span> <span class='hs-varid'>x</span>
<a name="line-29"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>err</span> <span class='hs-keyword'>of</span>
<a name="line-30"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>ununWebT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runServerPartT</span> <span class='hs-layout'>(</span><span class='hs-varid'>handler</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>rq</span>
<a name="line-31"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="simpleErrorHandler"></a><span class='hs-comment'>-- | A simple error handler which can be used with 'spUnwrapErrorT'.</span>
<a name="line-34"></a><span class='hs-comment'>-- </span>
<a name="line-35"></a><span class='hs-comment'>-- It returns the error message as a plain text message to the</span>
<a name="line-36"></a><span class='hs-comment'>-- browser. More sophisticated behaviour can be achieved by calling</span>
<a name="line-37"></a><span class='hs-comment'>-- your own custom error handler instead.</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><span class='hs-comment'>-- see also: 'spUnwrapErrorT'</span>
<a name="line-40"></a><span class='hs-definition'>simpleErrorHandler</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ServerPartT</span> <span class='hs-varid'>m</span> <span class='hs-conid'>Response</span>
<a name="line-41"></a><span class='hs-definition'>simpleErrorHandler</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ok</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toResponse</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-str'>"An error occured: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="errorHandlerSP"></a><span class='hs-comment'>-- | This 'ServerPart' modifier enables the use of 'throwError' and</span>
<a name="line-44"></a><span class='hs-comment'>-- 'catchError' inside the 'WebT' actions, by adding the 'ErrorT'</span>
<a name="line-45"></a><span class='hs-comment'>-- monad transformer to the stack.</span>
<a name="line-46"></a><span class='hs-comment'>--</span>
<a name="line-47"></a><span class='hs-comment'>-- You can wrap the complete second argument to 'simpleHTTP' in this</span>
<a name="line-48"></a><span class='hs-comment'>-- function.</span>
<a name="line-49"></a><span class='hs-comment'>--</span>
<a name="line-50"></a><span class='hs-comment'>-- DEPRECATED: use 'spUnwrapErrorT' instead.</span>
<a name="line-51"></a><span class='hs-definition'>errorHandlerSP</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Error</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>Request</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>WebT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ServerPartT</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ServerPartT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-52"></a><span class='hs-definition'>errorHandlerSP</span> <span class='hs-varid'>handler</span> <span class='hs-varid'>sps</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withRequest</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>req</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mkWebT</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-53"></a> <span class='hs-varid'>eer</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runErrorT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ununWebT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runServerPartT</span> <span class='hs-varid'>sps</span> <span class='hs-varid'>req</span>
<a name="line-54"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>eer</span> <span class='hs-keyword'>of</span>
<a name="line-55"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>ununWebT</span> <span class='hs-layout'>(</span><span class='hs-varid'>handler</span> <span class='hs-varid'>req</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>res</span>
<a name="line-57"></a><span class='hs-comment'>{-# DEPRECATED errorHandlerSP "Use spUnwrapErrorT" #-}</span>
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