* @author Sree Harsha Totakura
*/
+/**
+ * To be fixed:
+ * Should the handle be freed when the connection to service is lost?
+ * Should cancel_request have a call back (else simultaneous calls break)
+ */
+
#include "platform.h"
#include "gnunet_common.h"
#include "gnunet_container_lib.h"
#define TIMEOUT TIME_REL_MINS(3)
+
+/**
+ * The message queue
+ */
+struct MessageQueue
+{
+ /**
+ * The next pointer for doubly linked list
+ */
+ struct MessageQueue *next;
+
+ /**
+ * The prev pointer for doubly linked list
+ */
+ struct MessageQueue *prev;
+
+ /**
+ * The LOCKMANAGER Message
+ */
+ struct GNUNET_LOCKMANAGER_Message *msg;
+};
+
+
/**
* Handler for the lockmanager service
*/
*/
struct GNUNET_CLIENT_Connection *conn;
+ /**
+ * The transmit handle for transmissions using conn
+ */
+ struct GNUNET_CLIENT_TransmitHandle *transmit_handle;
+
/**
* Hashmap handle
*/
struct GNUNET_CONTAINER_MultiHashMap *hashmap;
+
+ /**
+ * Double linked list head for message queue
+ */
+ struct MessageQueue *mq_head;
+
+ /**
+ * Double linked list tail for message queue
+ */
+ struct MessageQueue *mq_tail;
+
+ /**
+ * Are we currently handling replies?
+ */
+ int in_replies;
};
*/
void *status_cb_cls;
- /**
- * The pending transmit handle for the ACQUIRE message
- */
- struct GNUNET_CLIENT_TransmitHandle *transmit_handle;
-
/**
* The locking domain of this request
*/
/**
* Structure for matching a lock
*/
-struct LockMatch
+struct LockingRequestMatch
{
/**
* The matched LockingRequest entry; Should be NULL if no entry is found
};
+/**
+ * Handler for server replies
+ *
+ * @param cls the LOCKMANAGER_Handle
+ * @param msg received message, NULL on timeout or fatal error
+ */
+static void
+handle_replies (void *cls,
+ const struct GNUNET_MessageHeader *msg);
+
+
+/**
+ * Transmit notify for sending message to server
+ *
+ * @param cls the lockmanager handle
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
+ */
+static size_t
+transmit_notify (void *cls, size_t size, void *buf)
+{
+ struct GNUNET_LOCKMANAGER_Handle *handle = cls;
+ struct MessageQueue *queue_entity;
+ uint16_t msg_size;
+
+ handle->transmit_handle = NULL;
+ queue_entity = handle->mq_head;
+ GNUNET_assert (NULL != queue_entity);
+ if ((0 == size) || (NULL == buf))
+ {
+ handle->transmit_handle =
+ GNUNET_CLIENT_notify_transmit_ready (handle->conn,
+ ntohs
+ (queue_entity->msg->header.size),
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_YES,
+ &transmit_notify,
+ handle);
+ return 0;
+ }
+ msg_size = ntohs (queue_entity->msg->header.size);
+ GNUNET_assert (size >= msg_size);
+ memcpy (buf, queue_entity->msg, msg_size);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Message of size %u sent\n", msg_size);
+ GNUNET_free (queue_entity->msg);
+ GNUNET_CONTAINER_DLL_remove (handle->mq_head,
+ handle->mq_tail,
+ queue_entity);
+ GNUNET_free (queue_entity);
+ queue_entity = handle->mq_head;
+ if (NULL != queue_entity)
+ {
+ handle->transmit_handle =
+ GNUNET_CLIENT_notify_transmit_ready (handle->conn,
+ ntohs
+ (queue_entity->msg->header.size),
+ TIMEOUT,
+ GNUNET_YES,
+ &transmit_notify,
+ handle);
+ }
+ if (GNUNET_NO == handle->in_replies)
+ {
+ GNUNET_CLIENT_receive (handle->conn,
+ &handle_replies,
+ handle,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ handle->in_replies = GNUNET_YES;
+ }
+ return msg_size;
+}
+
+
+/**
+ * Queues a message into handle's send message queue
+ *
+ * @param handle the lockmanager handle whose queue will be used
+ * @param msg the message to be queued
+ */
+static void
+queue_message (struct GNUNET_LOCKMANAGER_Handle *handle,
+ struct GNUNET_LOCKMANAGER_Message *msg)
+{
+ struct MessageQueue *queue_entity;
+
+ GNUNET_assert (NULL != msg);
+ queue_entity = GNUNET_malloc (sizeof (struct MessageQueue));
+ queue_entity->msg = msg;
+ GNUNET_CONTAINER_DLL_insert_tail (handle->mq_head,
+ handle->mq_tail,
+ queue_entity);
+ if (NULL == handle->transmit_handle)
+ {
+ handle->transmit_handle =
+ GNUNET_CLIENT_notify_transmit_ready (handle->conn,
+ ntohs (msg->header.size),
+ TIMEOUT,
+ GNUNET_YES,
+ &transmit_notify,
+ handle);
+ }
+}
+
+
/**
* Get the key for the given lock in the 'lock_map'.
*
/**
- * Hashmap iterator for matching a lock
+ * Hashmap iterator for matching a LockingRequest
*
- * @param cls the LockMatch structure
+ * @param cls the LockingRequestMatch structure
* @param key current key code
* @param value value in the hash map (struct GNUNET_LOCKMANAGER_LockingRequest)
* @return GNUNET_YES if we should continue to
* GNUNET_NO if not.
*/
static int
-match_iterator (void *cls, const GNUNET_HashCode *key, void *value)
+match_iterator (void *cls, const struct GNUNET_HashCode *key, void *value)
{
- struct LockMatch *match = cls;
+ struct LockingRequestMatch *match = cls;
struct GNUNET_LOCKMANAGER_LockingRequest *lr = value;
if ( (match->lock == lr->lock) && (0 == strcmp (match->domain, lr->domain)) )
uint32_t lock)
{
struct GNUNET_HashCode hash;
- struct LockMatch lock_match;
+ struct LockingRequestMatch lock_match;
lock_match.matched_entry = NULL;
lock_match.domain = domain;
if (NULL != r->status_cb)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Calling status change callback for lock: %d in domain: %s\n",
+ "Calling status change for SUCCESS on lock num: %d, domain: %s\n",
r->lock, r->domain);
r->status_cb (r->status_cb_cls,
r->domain,
}
+/**
+ * Function to generate acquire message for a lock
+ *
+ * @param domain_name the domain name of the lock
+ * @param lock the lock number
+ * @return the generated GNUNET_LOCKMANAGER_Message
+ */
+static struct GNUNET_LOCKMANAGER_Message *
+generate_acquire_msg (const char *domain_name, uint32_t lock)
+{
+ struct GNUNET_LOCKMANAGER_Message *msg;
+ size_t domain_name_len;
+ uint16_t msg_size;
+
+ domain_name_len = strlen (domain_name) + 1;
+ msg_size = sizeof (struct GNUNET_LOCKMANAGER_Message) + domain_name_len;
+ msg = GNUNET_malloc (msg_size);
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_LOCKMANAGER_ACQUIRE);
+ msg->header.size = htons (msg_size);
+ msg->lock = htonl (lock);
+ memcpy (&msg[1], domain_name, domain_name_len);
+ return msg;
+}
+
+
+/**
+ * Iterator to call relase on locks
+ *
+ * @param cls the lockmanager handle
+ * @param key current key code
+ * @param value the Locking request
+ * @return GNUNET_YES if we should continue to
+ * iterate,
+ * GNUNET_NO if not.
+ */
+static int
+release_n_retry_iterator (void *cls,
+ const struct GNUNET_HashCode * key,
+ void *value)
+{
+ struct GNUNET_LOCKMANAGER_LockingRequest *r = value;
+ struct GNUNET_LOCKMANAGER_Handle *h = cls;
+ struct GNUNET_LOCKMANAGER_Message *msg;
+
+ msg = generate_acquire_msg (r->domain, r->lock);
+ queue_message (h, msg);
+ if (GNUNET_LOCKMANAGER_RELEASE == r->status)
+ return GNUNET_YES;
+ if (NULL != r->status_cb)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling status change for RELEASE on lock num: %d, domain: %s\n",
+ r->lock, r->domain);
+ r->status = GNUNET_LOCKMANAGER_RELEASE;
+ r->status_cb (r->status_cb_cls,
+ r->domain,
+ r->lock,
+ GNUNET_LOCKMANAGER_RELEASE);
+ }
+ return GNUNET_YES;
+}
+
+
/**
* Handler for server replies
*
struct GNUNET_HashCode hash;
uint32_t lock;
uint16_t msize;
-
+
+ handle->in_replies = GNUNET_NO;
if (NULL == msg)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Lockmanager service not available or went down\n");
+ "Lockmanager service not available or went down\n");
+ /* Should release all locks and retry to acquire them */
+ GNUNET_CONTAINER_multihashmap_iterate (handle->hashmap,
+ &release_n_retry_iterator,
+ handle);
return;
}
+ GNUNET_CLIENT_receive (handle->conn,
+ &handle_replies,
+ handle,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ handle->in_replies = GNUNET_YES;
if (GNUNET_MESSAGE_TYPE_LOCKMANAGER_SUCCESS != ntohs(msg->type))
{
GNUNET_break (0);
}
-/**
- * Transmit notify for sending message to server
- *
- * @param cls the message to send
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
- */
-static size_t
-transmit_notify (void *cls, size_t size, void *buf)
-{
- struct GNUNET_LOCKMANAGER_Message *msg = cls;
- uint16_t msg_size;
-
- if ((0 == size) || (NULL == buf))
- {
- /* FIXME: Timed out -- requeue? */
- return 0;
- }
- msg_size = ntohs (msg->header.size);
- GNUNET_assert (size >= msg_size);
- memcpy (buf, msg, msg_size);
- GNUNET_free (msg);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Message of size %u sent\n", msg_size);
- return msg_size;
-}
-
-
/**
* Iterator to free hash map entries.
*
- * @param cls NULL
+ * @param cls the lockmanger handle
* @param key current key code
* @param value the Locking request
* @return GNUNET_YES if we should continue to
*/
static int
free_iterator(void *cls,
- const GNUNET_HashCode * key,
+ const struct GNUNET_HashCode * key,
void *value)
{
+ struct GNUNET_LOCKMANAGER_Handle *h = cls;
struct GNUNET_LOCKMANAGER_LockingRequest *r = value;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Clearing locking request\n");
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (h->hashmap,
+ key,
+ value));
GNUNET_free (r->domain);
GNUNET_free (r);
return GNUNET_YES;
&handle_replies,
h,
GNUNET_TIME_UNIT_FOREVER_REL);
-
+ h->in_replies = GNUNET_YES;
LOG (GNUNET_ERROR_TYPE_DEBUG, "%s() END\n", __func__);
return h;
}
void
GNUNET_LOCKMANAGER_disconnect (struct GNUNET_LOCKMANAGER_Handle *handle)
{
+ struct MessageQueue *head;
+
LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __func__);
- GNUNET_CLIENT_disconnect (handle->conn);
if (0 != GNUNET_CONTAINER_multihashmap_size (handle->hashmap))
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"calling %s\n", __func__);
GNUNET_CONTAINER_multihashmap_iterate (handle->hashmap,
&free_iterator,
- NULL);
+ handle);
}
GNUNET_CONTAINER_multihashmap_destroy (handle->hashmap);
+ /* Clear the message queue */
+ if (NULL != handle->transmit_handle)
+ {
+ GNUNET_CLIENT_notify_transmit_ready_cancel (handle->transmit_handle);
+ }
+ head = handle->mq_head;
+ while (NULL != head)
+ {
+ GNUNET_CONTAINER_DLL_remove (handle->mq_head,
+ handle->mq_tail,
+ head);
+ GNUNET_free (head->msg);
+ GNUNET_free (head);
+ head = handle->mq_head;
+ }
+ GNUNET_CLIENT_disconnect (handle->conn);
GNUNET_free (handle);
LOG (GNUNET_ERROR_TYPE_DEBUG, "%s() END\n", __func__);
}
struct GNUNET_LOCKMANAGER_LockingRequest *r;
struct GNUNET_LOCKMANAGER_Message *msg;
struct GNUNET_HashCode hash;
- uint16_t msg_size;
size_t domain_name_length;
LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __func__);
r->status_cb = status_cb;
r->status_cb_cls = status_cb_cls;
memcpy (r->domain, domain_name, domain_name_length);
- msg_size = sizeof (struct GNUNET_LOCKMANAGER_Message) + domain_name_length;
- msg = GNUNET_malloc (msg_size);
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_LOCKMANAGER_ACQUIRE);
- msg->header.size = htons (msg_size);
- msg->lock = htonl (lock);
- memcpy (&msg[1], r->domain, domain_name_length);
+ msg = generate_acquire_msg (r->domain, r->lock);
LOG (GNUNET_ERROR_TYPE_DEBUG, "Queueing ACQUIRE message\n");
- r->transmit_handle =
- GNUNET_CLIENT_notify_transmit_ready (r->handle->conn,
- msg_size,
- TIMEOUT,
- GNUNET_YES,
- &transmit_notify,
- msg);
+ queue_message (handle, msg);
get_key (r->domain, r->lock, &hash);
GNUNET_CONTAINER_multihashmap_put (r->handle->hashmap,
&hash,
/**
* Function to cancel the locking request generated by
- * GNUNET_LOCKMANAGER_acquire_lock. If the lock is acquired us then the lock is
- * released. GNUNET_LOCKMANAGER_StatusCallback will not be called upon any
+ * GNUNET_LOCKMANAGER_acquire_lock. If the lock is acquired by us then the lock
+ * is released. GNUNET_LOCKMANAGER_StatusCallback will not be called upon any
* status changes resulting due to this call.
*
* @param request the LockingRequest to cancel
msg->header.size = htons (msg_size);
msg->lock = htonl (request->lock);
memcpy (&msg[1], request->domain, domain_name_length);
- GNUNET_CLIENT_notify_transmit_ready (request->handle->conn,
- msg_size,
- TIMEOUT, /* What if this fails */
- GNUNET_NO,
- &transmit_notify,
- msg);
+ queue_message (request->handle, msg);
}
get_key (request->domain, request->lock, &hash);
GNUNET_assert (GNUNET_YES ==
projects / oweals / gnunet.git / blobdiff