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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* The Connection Manager sets itself up as a listener to the Messenger so it
* can take action based on system events.
*
* The Connection Manager queues and then processes in a later time slice the
* messages.
*
*/
#include <src/config.h>
#include <src/core/connectionManager.h>
#include <src/core/forwarder.h>
#include <src/messenger/messenger.h>
#include <src/messenger/messengerRecipient.h>
#include <src/messenger/missiveDeque.h>
#include <stdio.h>
#include <parc/algol/parc_Memory.h>
#include <parc/assert/parc_Assert.h>
struct connection_manager {
Forwarder *forwarder;
Logger *logger;
MessengerRecipient *messengerRecipient;
// we queue missives as they come in to process in our own
// event timeslice
MissiveDeque *missiveQueue;
// for deferred queue processing
PARCEventTimer *timerEvent;
};
/**
* Receives missives from the messenger, queues them, and schedules our
* execution
*
* We defer processing of missives to a later time slice
*/
static void connectionManager_MessengerCallback(MessengerRecipient *recipient,
Missive *missive);
/**
* Event callback
*
* This is our main run loop to process our queue of messages. It is scheduled
* in {@link connectionManager_MessengerCallback} when the queue becomes
* non-empty.
*
* When we are called here, we have exclusive use of the system, so we will not
* create any message loops
*
* @param [in] fd unused, required for compliance with function prototype
* @param [in] which_event unused, required for compliance with function
* prototype
* @param [in] connManagerVoidPtr A void* to ConnectionManager
*
*/
static void connectionManager_ProcessQueue(int fd, PARCEventType which_event,
void *connManagerVoidPtr);
static void connectionManager_ProcessClosedMissive(
ConnectionManager *connManager, const Missive *missive);
// ========================================================
// Public API
ConnectionManager *connectionManager_Create(Forwarder *forwarder) {
ConnectionManager *connManager =
parcMemory_AllocateAndClear(sizeof(ConnectionManager));
parcAssertNotNull(connManager,
"parcMemory_AllocateAndClear(%zu) returned NULL",
sizeof(ConnectionManager));
connManager->forwarder = forwarder;
connManager->missiveQueue = missiveDeque_Create();
connManager->logger = logger_Acquire(forwarder_GetLogger(forwarder));
Messenger *messenger = forwarder_GetMessenger(connManager->forwarder);
// creates the timer, but does not start it
PARCEventScheduler *base =
dispatcher_GetEventScheduler(forwarder_GetDispatcher(forwarder));
connManager->timerEvent = parcEventTimer_Create(
base, 0, connectionManager_ProcessQueue, connManager);
connManager->messengerRecipient = messengerRecipient_Create(
connManager, connectionManager_MessengerCallback);
messenger_Register(messenger, connManager->messengerRecipient);
return connManager;
}
void connectionManager_Destroy(ConnectionManager **managerPtr) {
parcAssertNotNull(managerPtr, "Double pointer must be non-null");
parcAssertNotNull(*managerPtr, "Double pointer must dereference to non-null");
ConnectionManager *connManager = *managerPtr;
Messenger *messenger = forwarder_GetMessenger(connManager->forwarder);
parcEventTimer_Destroy(&(connManager->timerEvent));
messenger_Unregister(messenger, connManager->messengerRecipient);
messengerRecipient_Destroy(&connManager->messengerRecipient);
missiveDeque_Release(&connManager->missiveQueue);
logger_Release(&connManager->logger);
parcMemory_Deallocate((void **)&connManager);
*managerPtr = NULL;
}
// ========================================================
// Internal Functions
static void connectionManager_MessengerCallback(MessengerRecipient *recipient,
Missive *missive) {
ConnectionManager *connManager =
messengerRecipient_GetRecipientContext(recipient);
// we do not release our reference count, we store it until later
// We are called with our own reference, so we do not need to acquire the
// missive here.
missiveDeque_Append(connManager->missiveQueue, missive);
if (missiveDeque_Size(connManager->missiveQueue) == 1) {
// When it becomes non-empty, schedule {@link
// connectionManager_ProcessQueue}
struct timeval immediateTimeout = {0, 0};
parcEventTimer_Start(connManager->timerEvent, &immediateTimeout);
}
}
static void connectionManager_ProcessQueue(int fd, PARCEventType which_event,
void *connManagerVoidPtr) {
ConnectionManager *connManager = (ConnectionManager *)connManagerVoidPtr;
Missive *missive;
while ((missive = missiveDeque_RemoveFirst(connManager->missiveQueue)) !=
NULL) {
switch (missive_GetType(missive)) {
case MissiveType_ConnectionCreate:
// hook to signal that a new connection was created
break;
case MissiveType_ConnectionUp:
// hook to signal that a new connection is up
break;
case MissiveType_ConnectionDown:
// hook to signal that a connection is down
break;
case MissiveType_ConnectionClosed:
connectionManager_ProcessClosedMissive(connManager, missive);
break;
case MissiveType_ConnectionDestroyed:
// hook to signal that a connection was destroyed
break;
default:
parcTrapUnexpectedState("Missive %p of unknown type: %d",
(void *)missive, missive_GetType(missive));
}
missive_Release(&missive);
}
}
static void connectionManager_ProcessClosedMissive(
ConnectionManager *connManager, const Missive *missive) {
logger_Log(connManager->logger, LoggerFacility_Core, PARCLogLevel_Debug,
__func__, "Processing CLOSED message for connid %u",
missive_GetConnectionId(missive));
ConnectionTable *table = forwarder_GetConnectionTable(connManager->forwarder);
const Connection *conn =
connectionTable_FindById(table, missive_GetConnectionId(missive));
if (conn) {
// this will destroy the connection if its the last reference count
connectionTable_Remove(table, conn);
// remove from FIB
forwarder_RemoveConnectionIdFromRoutes(connManager->forwarder,
missive_GetConnectionId(missive));
}
}
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