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Pause server #448

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Pause server #448

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Commits on Oct 19, 2016

  1. API for connection limits of Server 

    Add a `pause`/`resume` API to `Server` which removes/adds a server's
listening sockets on its event loop selector.  This facility allows DoS
prevention from SYN flooding connection herds.

Add `max_connections` kwarg to `loop.create_server` and `Server` which
controls pause/resume behavior when not `None`.

Notes:

  1. Using Server.pause/resume and create_server(max_connections) are
     mutually exclusive.
  2. The listen backlog and accept semantics are not taken into consideration.
     As a result the actual number of connections established will vary
     and should be considered platform and/or event loop dependant.
    @mayfield
    mayfield committed Oct 19, 2016
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  2. Add max_connections to create_unix_server. 

    Fix Server create for unix sockets and add support for max_connections.
    @mayfield
    mayfield committed Oct 19, 2016
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  3. Add tests for Server pause behavior. 

    Tests for create_server(max_connections=number) and Server.pause/resume.
    @mayfield
    mayfield committed Oct 19, 2016
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  4. Add Server pause tests for unix servers. 

    Refactored a bit to share most the logic with the TCP server.
    @mayfield
    mayfield committed Oct 19, 2016
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  5. Skip Server pause tests with Proactor event loop

    @mayfield
    mayfield committed Oct 19, 2016
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