This patch series basically adds a new parameter 'family' to the constructors
of daemon.AsyncUDPSocket and confd.client.ConfdUDPClient. This enables the
users of these two classes to support IPv6.

In ganeti-confd.ConfdAsyncUDPClient a method to check the address families of
all peers is added.

Furthermore it adds unittests for the added functionality.

Signed-off-by: Manuel Franceschini <livewire@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Currently the message stream can process any number of messages in
parallel (if they get dispatched to different threads or processes).
In order to limit their number we only handle messages and read from
the socket if we're under a certain limit of unanswered ones.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

This function adds the ability for a AsyncTerminatedMessageStream to
have a thread-safe message delivery function.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

This new asyncore dispatcher can be used to force a thread running the
asyncore loop to awake from the select, by signaling it on one of its
selected sockets.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Unittests cover AsyncStreamServer and AsyncTerminatedMessageStream with
both tcp and unix sockets.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

- _ThreadedClient was added on the idea of making this unittest
  concurrent, which was actually never done (we could test everything
  without it, so well)
- handle_write() was never called without filling the send queue, and
  this caused me trouble now that I learned to look at coverage

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Luca Bigliardi <shammash@google.com>

This bug was found in the asyncore master patch series, but actually
applies to 2.1 for AsyncUDPSocket as well.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

This makes sure that any unforeseen error raises an exception rather
then just increasing a counter. It makes unittest debugging a lot
easier.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

This is needed if daemons are in the foreground, and get ctrl+c-ed by
the user. Also add unittests to make sure the correct signals terminate
the mainloop.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

By using enterabs we can schedule events at the same time, which will
then be sorted by priority.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Currently, in testDeferredCancel if the self._CancelEvent are entered
more than 0.3 seconds after the _SendSig have been entered, the test
could fail. This is unlikely but may happen. To avoid it we use
enterabs, to use absolute times.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Currently we never do that, but it's nice to know we can restart the
mainloop, after termination.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>