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101 :: How to create an asyncHTTPServer

• Steve (orginal) [2012-10-30T17:31:56+01:00] view original

  Would somebody please be kind enough to show a complete beginner how to create an asyncHTTPServer?

  When I look at the signature from the library document it seems confusing to me:

  proc asyncHTTPServer*(handleRequest: proc (server: PAsyncHTTPServer;
    client: TSocket; path, query: string): bool {.closure.}; port = TPort(80);
                      address = ""): PAsyncHTTPServer
  Run

  The outer procedure returns a PAsyncHTTPServer but the inner procedure passed to it in the handleRequest argument expects to receive a PAsyncHTTPServer as one of its parameters, it seems like a chicken and egg to me.

  Thanks.

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• dom96 (orginal) [2012-10-30T19:17:02+01:00] view original

  Welcome to the forum!

  In this case the handleRequest parameter is simply a closure. You can either pass a function to it, or a closure. E.g.

  
  import httpserver, asyncio, sockets
  proc handleRequest(server: PAsyncHTTPServer; client: TSocket; path, query: string): bool =
    echo("Got request with path of: ", path)
  
  var disp = newDispatcher()
  var http = asyncHTTPServer(handleRequest, TPort(6666))
  disp.register(http)
  while true:
    if not disp.poll():
      echo("HTTP server has been closed.")
  Run

  Best of luck!

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• Steve (orginal) [2012-10-31T10:52:56+01:00] view original

  Thanks very much for your help dom96.

  I have to confess I had to Google 'closure' :-)

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• leledumbo (orginal) [2012-10-31T17:01:41+01:00] view original

  Depending on your previous programming background, you could interpret it as procedural type or function pointer (though they're not totally equivalent with closures, they do have basic similarities).

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