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47f502df5e
Implement active reverse connection initialization. This is done through a new task stored in the receiver structure. This task is instantiated via bind callback and first woken up via enable callback. Task handler is separated into two halves. On the first step, a new connection is allocated and stored in <pend_conn> member of the receiver. This new client connection will proceed to connect using the server instance referenced in the bind_conf. When connect has successfully been executed and HTTP/2 connection is ready for exchange after SETTINGS, reverse_connect task is woken up. As <pend_conn> is still set, the second halve is executed which only execute listener_accept(). This will in turn execute accept_conn callback which is defined to return the pending connection. The task is automatically requeued inside accept_conn callback if bind maxconn is not yet reached. This allows to specify how many connection should be opened. Each connection is instantiated and reversed serially one by one until maxconn is reached. conn_free() has been modified to handle failure if a reverse connection fails before being accepted. In this case, no session exists to notify about the failure. Instead, reverse_connect task is requeud with a 1 second delay, giving time to fix a possible network issue. This will allow to attempt a new connection reverse. Note that for the moment connection rebinding after accept is disabled for simplicity. Extra operations are required to migrate an existing connection and its stack to a new thread which will be implemented later.