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<pre id='vimCodeElement'>
<span class="Comment"># Example of reading from a socket using channels and writing back to it</span>
<span class="Comment"># directly. Running this file and navigating to <address of server>:8080</span>
<span class="Comment"># should result in your browser displaying "SUCCESS!".</span>
<span class="Comment">#</span>
<span class="Comment"># Unfortunately, the reading implementation has some redundant, inelegant</span>
<span class="Comment"># code to make up for my lack of insight into Linux's socket internals.</span>
<span class="muRecipe">def</span> main [
<span class="Constant">local-scope</span>
socket:num<span class="Special"> <- </span>$socket <span class="Constant">8080/port</span>
$print <span class="Constant">[Mu socket creation returned ]</span>, socket, <span class="Constant">10/newline</span>
session:num<span class="Special"> <- </span>$accept socket
contents:&:source:char, sink:&:sink:char<span class="Special"> <- </span>new-channel <span class="Constant">30</span>
sink<span class="Special"> <- </span>start-running transmit-from-socket session, sink
buf:&:buffer<span class="Special"> <- </span>new-buffer <span class="Constant">30</span>
<span class="Delimiter">{</span>
c:char, done?:bool, contents<span class="Special"> <- </span>read contents
<span class="muControl">break-if</span> done?
buf<span class="Special"> <- </span>append buf, c
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
socket-text:text<span class="Special"> <- </span>buffer-to-array buf
$print <span class="Constant">[Done reading from socket.]</span>, <span class="Constant">10/newline</span>
write-to-socket session, <span class="Constant">[HTTP/1.0 200 OK</span>
<span class="Constant">Content-type: text/plain</span>
<span class="Constant">SUCCESS!</span>
<span class="Constant">]</span>
$print <span class="Constant">10/newline</span>, <span class="Constant">[Wrote to and closing socket...]</span>, <span class="Constant">10/newline</span>
$close-socket session
$close-socket socket
]
<span class="muRecipe">def</span> write-to-socket session-socket:number, s:address:array:character [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
len:number<span class="Special"> <- </span>length *s
i:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal i, len
<span class="muControl">break-if</span> done?
c:character<span class="Special"> <- </span>index *s, i
$print <span class="Constant">[writing to socket: ]</span>, i, <span class="Constant">[ ]</span>, c, <span class="Constant">10/newline</span>
$write-to-socket session-socket, c
i<span class="Special"> <- </span>add i, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">def</span> transmit-from-socket session:num, sink:&:sink:char<span class="muRecipe"> -> </span>sink:&:sink:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
req:text, bytes-read:number<span class="Special"> <- </span>$read-from-socket session, <span class="Constant">4096/bytes</span>
$print <span class="Constant">[read ]</span>, bytes-read, <span class="Constant">[ bytes from socket]</span>, <span class="Constant">10/newline</span>
i:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal i, bytes-read
<span class="muControl">break-if</span> done?
c:char<span class="Special"> <- </span>index *req, i
end-of-request?:bool<span class="Special"> <- </span>equal c, <span class="Constant">10/newline</span>
<span class="muControl">break-if</span> end-of-request? <span class="Comment"># To be safe, for now.</span>
sink<span class="Special"> <- </span>write sink, c
i<span class="Special"> <- </span>add i, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
sink<span class="Special"> <- </span>close sink
]
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