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<pre id='vimCodeElement'>
<span class="Comment"># Wrappers around socket primitives that are easier to test.</span>

<span class="Comment"># To test server operations, just run a real client against localhost.</span>
<span class="muScenario">scenario</span> example-server-test [
  <span class="Constant">local-scope</span>
  <span class="Comment"># test server without a fake on a random (real) port</span>
  <span class="Comment"># that way repeatedly running the test will give ports time to timeout and</span>
  <span class="Comment"># close before reusing them</span>
  make-random-nondeterministic
  port:num <span class="Special">&lt;-</span> random-in-range <span class="Constant">0/real-random-numbers</span>,<span class="Constant"> 8000</span>,<span class="Constant"> 8100</span>
  run [
    socket:num <span class="Special">&lt;-</span> $open-server-socket port
    assert socket, <span class="Constant">[ </span>
<span class="Constant">F - example-server-test: $open-server-socket failed]</span>
    handler-routine:number <span class="Special">&lt;-</span> start-running serve-one-request socket, example-handler
  ]
  source:&amp;:source:char <span class="Special">&lt;-</span> start-reading-from-network <span class="Constant">0/real-resources</span>, <span class="Constant">[localhost/]</span>, port
  response:text <span class="Special">&lt;-</span> drain source
  10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *response
  memory-should-contain [
    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
  ]
  socket <span class="Special">&lt;-</span> $close-socket socket
]
<span class="Comment"># helper just for this scenario</span>
<span class="muRecipe">def</span> example-handler query:text<span class="muRecipe"> -&gt; </span>response:text [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="muControl">return</span> <span class="Constant">[abc]</span>
]

<span class="Comment"># To test client operations, use `assume-resources` with a filename that</span>
<span class="Comment"># begins with a hostname. (Filenames starting with '/' are assumed to be</span>
<span class="Comment"># local.)</span>
<span class="muScenario">scenario</span> example-client-test [
  <span class="Constant">local-scope</span>
  assume-resources [
    <span class="Constant">[example.com/]</span> <span class="Special">&lt;-</span> [
<span class="Constant">      |abc|</span>
    ]
  ]
  run [
    source:&amp;:source:char <span class="Special">&lt;-</span> start-reading-from-network resources, <span class="Constant">[example.com/]</span>
  ]
  contents:text <span class="Special">&lt;-</span> drain source
  10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *contents
  memory-should-contain [
    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc</span>
<span class="Constant">]</span>
  ]
]

<span class="muData">type</span> request-handler = (recipe text<span class="muRecipe"> -&gt; </span>text)

<span class="muRecipe">def</span> serve-one-request socket:num, request-handler:request-handler<span class="muRecipe"> -&gt; </span>socket:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  session:num <span class="Special">&lt;-</span> $accept socket
  assert session, <span class="Constant">[ </span>
<span class="Constant">F - example-server-test: $accept failed]</span>
  contents:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> new-channel<span class="Constant"> 30</span>
  start-running receive-from-socket session, sink
  query:text <span class="Special">&lt;-</span> drain contents
  response:text <span class="Special">&lt;-</span> call request-handler, query
  write-to-socket session, response
  session <span class="Special">&lt;-</span> $close-socket session
]

<span class="muRecipe">def</span> start-reading-from-network resources:&amp;:resources, uri:text<span class="muRecipe"> -&gt; </span>contents:&amp;:source:char [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Delimiter">{</span>
    port:num, port-found?:boolean <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
    <span class="muControl">break-if</span> port-found?
    port <span class="Special">&lt;-</span> copy <span class="Constant">80/http-port</span>
  <span class="Delimiter">}</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> resources
    <span class="Comment"># fake network</span>
    contents <span class="Special">&lt;-</span> start-reading-from-fake-resources resources, uri
    <span class="muControl">return</span>
  <span class="Delimiter">}</span>
  <span class="Comment"># real network</span>
  host:text, path:text <span class="Special">&lt;-</span> split-at uri, <span class="Constant">47/slash</span>
  socket:num <span class="Special">&lt;-</span> $open-client-socket host, port
  assert socket, <span class="Constant">[contents]</span>
  req:text <span class="Special">&lt;-</span> interpolate <span class="Constant">[GET _ HTTP/1.1]</span>, path
  request-socket socket, req
  contents:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> new-channel<span class="Constant"> 10000</span>
  start-running receive-from-client-socket-and-close socket, sink
]

<span class="muRecipe">def</span> request-socket socket:num, s:text<span class="muRecipe"> -&gt; </span>socket:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  write-to-socket socket, s
  $write-to-socket socket, <span class="Constant">13/cr</span>
  $write-to-socket socket, <span class="Constant">10/lf</span>
  <span class="Comment"># empty line to delimit request</span>
  $write-to-socket socket, <span class="Constant">13/cr</span>
  $write-to-socket socket, <span class="Constant">10/lf</span>
]

<span class="muRecipe">def</span> receive-from-socket socket:num, sink:&amp;:sink:char<span class="muRecipe"> -&gt; </span>sink:&amp;:sink:char, socket:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Delimiter">{</span>
<span class="Constant">    +next-attempt</span>
    c:char, found?:bool, eof?:bool, error:num <span class="Special">&lt;-</span> $read-from-socket socket
    <span class="muControl">break-if</span> eof?
    <span class="muControl">break-if</span> error
    <span class="Delimiter">{</span>
      <span class="muControl">break-unless</span> found?
      sink <span class="Special">&lt;-</span> write sink, c
    <span class="Delimiter">}</span>
    <span class="Delimiter">{</span>
      <span class="muControl">break-if</span> found?
      switch
    <span class="Delimiter">}</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  sink <span class="Special">&lt;-</span> close sink
]

<span class="muRecipe">def</span> receive-from-client-socket-and-close socket:num, sink:&amp;:sink:char<span class="muRecipe"> -&gt; </span>sink:&amp;:sink:char, socket:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  sink <span class="Special">&lt;-</span> receive-from-socket socket, sink
  socket <span class="Special">&lt;-</span> $close-socket socket
]

<span class="muRecipe">def</span> write-to-socket socket:num, s:text [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  len:num <span class="Special">&lt;-</span> length *s
  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
  <span class="Delimiter">{</span>
    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
    <span class="muControl">break-if</span> done?
    c:char <span class="Special">&lt;-</span> index *s, i
    $write-to-socket socket, c
    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="Comment"># like split-first, but don't eat the delimiter</span>
<span class="muRecipe">def</span> split-at text:text, delim:char<span class="muRecipe"> -&gt; </span>x:text, y:text [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Comment"># empty text? return empty texts</span>
  len:num <span class="Special">&lt;-</span> length *text
  <span class="Delimiter">{</span>
    empty?:bool <span class="Special">&lt;-</span> equal len,<span class="Constant"> 0</span>
    <span class="muControl">break-unless</span> empty?
    x:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
    y:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
    <span class="muControl">return</span>
  <span class="Delimiter">}</span>
  idx:num <span class="Special">&lt;-</span> find-next text, delim,<span class="Constant"> 0</span>
  x:text <span class="Special">&lt;-</span> copy-range text,<span class="Constant"> 0</span>, idx
  y:text <span class="Special">&lt;-</span> copy-range text, idx, len
]

<span class="muScenario">scenario</span> text-split-at [
  <span class="Constant">local-scope</span>
  x:text <span class="Special">&lt;-</span> new <span class="Constant">[a/b]</span>
  run [
    y:text, z:text <span class="Special">&lt;-</span> split-at x, <span class="Constant">47/slash</span>
    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
    20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
  ]
  memory-should-contain [
    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[/b]</span>
  ]
]
</pre>
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