/*
This file is part of GNUnet.
- (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2009, 2010, 2011, 2012, 2016 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
#include "gnunet_dht_service.h"
#include "dht.h"
-#define DEBUG_DHT_API GNUNET_EXTRA_LOGGING
-
#define LOG(kind,...) GNUNET_log_from (kind, "dht-api",__VA_ARGS__)
+
/**
- * Entry in our list of messages to be (re-)transmitted.
+ * Handle to a PUT request.
*/
-struct PendingMessage
+struct GNUNET_DHT_PutHandle
{
/**
- * This is a doubly-linked list.
+ * Kept in a DLL.
*/
- struct PendingMessage *prev;
+ struct GNUNET_DHT_PutHandle *next;
/**
- * This is a doubly-linked list.
+ * Kept in a DLL.
*/
- struct PendingMessage *next;
+ struct GNUNET_DHT_PutHandle *prev;
/**
- * Message that is pending, allocated at the end
- * of this struct.
+ * Continuation to call when done.
*/
- const struct GNUNET_MessageHeader *msg;
+ GNUNET_DHT_PutContinuation cont;
/**
- * Handle to the DHT API context.
+ * Main handle to this DHT api
*/
- struct GNUNET_DHT_Handle *handle;
+ struct GNUNET_DHT_Handle *dht_handle;
/**
- * Continuation to call when the request has been
- * transmitted (for the first time) to the service; can be NULL.
+ * Closure for @e cont.
*/
- GNUNET_SCHEDULER_Task cont;
+ void *cont_cls;
/**
- * Closure for 'cont'.
+ * Unique ID for the PUT operation.
*/
- void *cont_cls;
+ uint64_t unique_id;
+
+};
+
+/**
+ * Handle to a GET request
+ */
+struct GNUNET_DHT_GetHandle
+{
+
+ /**
+ * Iterator to call on data receipt
+ */
+ GNUNET_DHT_GetIterator iter;
+
+ /**
+ * Closure for @a iter.
+ */
+ void *iter_cls;
+
+ /**
+ * Main handle to this DHT api
+ */
+ struct GNUNET_DHT_Handle *dht_handle;
/**
- * Timeout task for this message
+ * Array of hash codes over the results that we have already
+ * seen.
*/
- GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+ struct GNUNET_HashCode *seen_results;
/**
- * Unique ID for this request
+ * Key that this get request is for
+ */
+ struct GNUNET_HashCode key;
+
+ /**
+ * Unique identifier for this request (for key collisions).
*/
uint64_t unique_id;
/**
- * Free the saved message once sent, set to GNUNET_YES for messages
- * that do not receive responses; GNUNET_NO if this pending message
- * is aliased from a 'struct GNUNET_DHT_RouteHandle' and will be freed
- * from there.
+ * Size of the extended query, allocated at the end of this struct.
*/
- int free_on_send;
+ size_t xquery_size;
/**
- * GNUNET_YES if this message is in our pending queue right now.
+ * Desired replication level.
*/
- int in_pending_queue;
+ uint32_t desired_replication_level;
+
+ /**
+ * Type of the block we are looking for.
+ */
+ enum GNUNET_BLOCK_Type type;
+
+ /**
+ * Routing options.
+ */
+ enum GNUNET_DHT_RouteOption options;
+
+ /**
+ * Size of the @e seen_results array. Note that not
+ * all positions might be used (as we over-allocate).
+ */
+ unsigned int seen_results_size;
+
+ /**
+ * Offset into the @e seen_results array marking the
+ * end of the positions that are actually used.
+ */
+ unsigned int seen_results_end;
};
/**
- * Handle to a GET request
+ * Handle to a monitoring request.
*/
-struct GNUNET_DHT_GetHandle
+struct GNUNET_DHT_MonitorHandle
{
-
/**
- * Iterator to call on data receipt
+ * DLL.
*/
- GNUNET_DHT_GetIterator iter;
+ struct GNUNET_DHT_MonitorHandle *next;
/**
- * Closure for the iterator callback
+ * DLL.
*/
- void *iter_cls;
+ struct GNUNET_DHT_MonitorHandle *prev;
/**
- * Main handle to this DHT api
+ * Main handle to this DHT api.
*/
struct GNUNET_DHT_Handle *dht_handle;
/**
- * The actual message sent for this request,
- * used for retransmitting requests on service
- * failure/reconnect. Freed on route_stop.
+ * Type of block looked for.
*/
- struct PendingMessage *message;
+ enum GNUNET_BLOCK_Type type;
/**
- * Key that this get request is for
+ * Key being looked for, NULL == all.
*/
- GNUNET_HashCode key;
+ struct GNUNET_HashCode *key;
/**
- * Unique identifier for this request (for key collisions).
+ * Callback for each received message of type get.
*/
- uint64_t unique_id;
+ GNUNET_DHT_MonitorGetCB get_cb;
+
+ /**
+ * Callback for each received message of type get response.
+ */
+ GNUNET_DHT_MonitorGetRespCB get_resp_cb;
+
+ /**
+ * Callback for each received message of type put.
+ */
+ GNUNET_DHT_MonitorPutCB put_cb;
+
+ /**
+ * Closure for @e get_cb, @e put_cb and @e get_resp_cb.
+ */
+ void *cb_cls;
};
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
- * Socket (if available).
+ * Connection to DHT service.
+ */
+ struct GNUNET_MQ_Handle *mq;
+
+ /**
+ * Head of linked list of messages we would like to monitor.
*/
- struct GNUNET_CLIENT_Connection *client;
+ struct GNUNET_DHT_MonitorHandle *monitor_head;
/**
- * Currently pending transmission request (or NULL).
+ * Tail of linked list of messages we would like to monitor.
*/
- struct GNUNET_CLIENT_TransmitHandle *th;
+ struct GNUNET_DHT_MonitorHandle *monitor_tail;
/**
- * Head of linked list of messages we would like to transmit.
+ * Head of active PUT requests.
*/
- struct PendingMessage *pending_head;
+ struct GNUNET_DHT_PutHandle *put_head;
/**
- * Tail of linked list of messages we would like to transmit.
+ * Tail of active PUT requests.
*/
- struct PendingMessage *pending_tail;
+ struct GNUNET_DHT_PutHandle *put_tail;
/**
- * Hash map containing the current outstanding unique requests
- * (values are of type 'struct GNUNET_DHT_RouteHandle').
+ * Hash map containing the current outstanding unique GET requests
+ * (values are of type `struct GNUNET_DHT_GetHandle`).
*/
struct GNUNET_CONTAINER_MultiHashMap *active_requests;
/**
* Task for trying to reconnect.
*/
- GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
+ struct GNUNET_SCHEDULER_Task *reconnect_task;
/**
* How quickly should we retry? Used for exponential back-off on
*/
uint64_t uid_gen;
- /**
- * Did we start our receive loop yet?
- */
- int in_receive;
+
};
/**
- * Handler for messages received from the DHT service
- * a demultiplexer which handles numerous message types
+ * Try to (re)connect to the DHT service.
*
+ * @param h DHT handle to reconnect
+ * @return #GNUNET_YES on success, #GNUNET_NO on failure.
+ */
+static int
+try_connect (struct GNUNET_DHT_Handle *h);
+
+
+/**
+ * Send GET message for a @a get_handle to DHT.
+ *
+ * @param gh GET to generate messages for.
*/
static void
-service_message_handler (void *cls, const struct GNUNET_MessageHeader *msg);
+send_get (struct GNUNET_DHT_GetHandle *gh)
+{
+ struct GNUNET_DHT_Handle *h = gh->dht_handle;
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_DHT_ClientGetMessage *get_msg;
+
+ env = GNUNET_MQ_msg_extra (get_msg,
+ gh->xquery_size,
+ GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET);
+ get_msg->options = htonl ((uint32_t) gh->options);
+ get_msg->desired_replication_level = htonl (gh->desired_replication_level);
+ get_msg->type = htonl (gh->type);
+ get_msg->key = gh->key;
+ get_msg->unique_id = gh->unique_id;
+ GNUNET_memcpy (&get_msg[1],
+ &gh[1],
+ gh->xquery_size);
+ GNUNET_MQ_send (h->mq,
+ env);
+}
/**
- * Try to (re)connect to the DHT service.
+ * Send GET message(s) for indicating which results are already known
+ * for a @a get_handle to DHT. Complex as we need to send the list of
+ * known results, which means we may need mulitple messages to block
+ * known results from the result set.
*
- * @return GNUNET_YES on success, GNUNET_NO on failure.
+ * @param gh GET to generate messages for
+ * @param transmission_offset_start at which offset should we start?
*/
-static int
-try_connect (struct GNUNET_DHT_Handle *handle)
+static void
+send_get_known_results (struct GNUNET_DHT_GetHandle *gh,
+ unsigned int transmission_offset_start)
{
- if (handle->client != NULL)
- return GNUNET_OK;
- handle->in_receive = GNUNET_NO;
- handle->client = GNUNET_CLIENT_connect ("dht", handle->cfg);
- if (handle->client == NULL)
+ struct GNUNET_DHT_Handle *h = gh->dht_handle;
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_DHT_ClientGetResultSeenMessage *msg;
+ unsigned int delta;
+ unsigned int max;
+ unsigned int transmission_offset;
+
+ max = (GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (*msg))
+ / sizeof (struct GNUNET_HashCode);
+ transmission_offset = transmission_offset_start;
+ while (transmission_offset < gh->seen_results_end)
{
- LOG (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to connect to the DHT service!\n"));
- return GNUNET_NO;
+ delta = gh->seen_results_end - transmission_offset;
+ if (delta > max)
+ delta = max;
+ env = GNUNET_MQ_msg_extra (msg,
+ delta * sizeof (struct GNUNET_HashCode),
+ GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_RESULTS_KNOWN);
+ msg->key = gh->key;
+ msg->unique_id = gh->unique_id;
+ GNUNET_memcpy (&msg[1],
+ &gh->seen_results[transmission_offset],
+ sizeof (struct GNUNET_HashCode) * delta);
+ GNUNET_MQ_send (h->mq,
+ env);
+ transmission_offset += delta;
}
- return GNUNET_YES;
}
/**
- * Add the request corresponding to the given route handle
+ * Add the GET request corresponding to the given route handle
* to the pending queue (if it is not already in there).
*
- * @param cls the 'struct GNUNET_DHT_Handle*'
+ * @param cls the `struct GNUNET_DHT_Handle *`
* @param key key for the request (not used)
- * @param value the 'struct GNUNET_DHT_GetHandle*'
- * @return GNUNET_YES (always)
+ * @param value the `struct GNUNET_DHT_GetHandle *`
+ * @return #GNUNET_YES (always)
*/
static int
-add_request_to_pending (void *cls, const GNUNET_HashCode * key, void *value)
+add_get_request_to_pending (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
struct GNUNET_DHT_Handle *handle = cls;
- struct GNUNET_DHT_GetHandle *rh = value;
+ struct GNUNET_DHT_GetHandle *gh = value;
- if (GNUNET_NO == rh->message->in_pending_queue)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Retransmitting request related to %s to DHT %p\n",
- GNUNET_h2s (key),
- handle);
- GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
- rh->message);
- rh->message->in_pending_queue = GNUNET_YES;
- }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Retransmitting request related to %s to DHT %p\n",
+ GNUNET_h2s (key),
+ handle);
+ send_get (gh);
+ send_get_known_results (gh, 0);
return GNUNET_YES;
}
/**
- * Try to send messages from list of messages to send
- * @param handle DHT_Handle
+ * Send #GNUNET_MESSAGE_TYPE_DHT_MONITOR_START message.
+ *
+ * @param mh monitor handle to generate start message for
*/
static void
-process_pending_messages (struct GNUNET_DHT_Handle *handle);
+send_monitor_start (struct GNUNET_DHT_MonitorHandle *mh)
+{
+ struct GNUNET_DHT_Handle *h = mh->dht_handle;
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_DHT_MonitorStartStopMessage *m;
+
+ env = GNUNET_MQ_msg (m,
+ GNUNET_MESSAGE_TYPE_DHT_MONITOR_START);
+ m->type = htonl (mh->type);
+ m->get = htons (NULL != mh->get_cb);
+ m->get_resp = htons (NULL != mh->get_resp_cb);
+ m->put = htons (NULL != mh->put_cb);
+ if (NULL != mh->key)
+ {
+ m->filter_key = htons(1);
+ m->key = *mh->key;
+ }
+ GNUNET_MQ_send (h->mq,
+ env);
+}
/**
* Try reconnecting to the dht service.
*
- * @param cls GNUNET_DHT_Handle
- * @param tc scheduler context
+ * @param cls a `struct GNUNET_DHT_Handle`
*/
static void
-try_reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+try_reconnect (void *cls)
{
- struct GNUNET_DHT_Handle *handle = cls;
+ struct GNUNET_DHT_Handle *h = cls;
+ struct GNUNET_DHT_MonitorHandle *mh;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Reconnecting with DHT %p\n",
- handle);
- handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- if (handle->retry_time.rel_value < GNUNET_CONSTANTS_SERVICE_RETRY.rel_value)
- handle->retry_time = GNUNET_CONSTANTS_SERVICE_RETRY;
- else
- handle->retry_time = GNUNET_TIME_relative_multiply (handle->retry_time, 2);
- if (handle->retry_time.rel_value > GNUNET_CONSTANTS_SERVICE_TIMEOUT.rel_value)
- handle->retry_time = GNUNET_CONSTANTS_SERVICE_TIMEOUT;
- handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- if (GNUNET_YES != try_connect (handle))
+ h);
+ h->retry_time = GNUNET_TIME_STD_BACKOFF (h->retry_time);
+ h->reconnect_task = NULL;
+ if (GNUNET_YES != try_connect (h))
{
- LOG (GNUNET_ERROR_TYPE_DEBUG, "dht reconnect failed(!)\n");
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "DHT reconnect failed!\n");
+ h->reconnect_task
+ = GNUNET_SCHEDULER_add_delayed (h->retry_time,
+ &try_reconnect,
+ h);
return;
}
- GNUNET_CONTAINER_multihashmap_iterate (handle->active_requests,
- &add_request_to_pending, handle);
- process_pending_messages (handle);
+ GNUNET_CONTAINER_multihashmap_iterate (h->active_requests,
+ &add_get_request_to_pending,
+ h);
+ for (mh = h->monitor_head; NULL != mh; mh = mh->next)
+ send_monitor_start (mh);
}
/**
* Try reconnecting to the DHT service.
*
- * @param handle handle to dht to (possibly) disconnect and reconnect
+ * @param h handle to dht to (possibly) disconnect and reconnect
*/
static void
-do_disconnect (struct GNUNET_DHT_Handle *handle)
+do_disconnect (struct GNUNET_DHT_Handle *h)
{
- if (handle->client == NULL)
+ struct GNUNET_DHT_PutHandle *ph;
+ GNUNET_DHT_PutContinuation cont;
+ void *cont_cls;
+
+ if (NULL == h->mq)
return;
- GNUNET_assert (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
- if (NULL != handle->th)
- GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
- handle->th = NULL;
+ GNUNET_MQ_destroy (h->mq);
+ h->mq = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Disconnecting from DHT service, will try to reconnect in %llu ms\n",
- (unsigned long long) handle->retry_time.rel_value);
- GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
- handle->client = NULL;
- handle->reconnect_task =
- GNUNET_SCHEDULER_add_delayed (handle->retry_time, &try_reconnect, handle);
+ "Disconnecting from DHT service, will try to reconnect in %s\n",
+ GNUNET_STRINGS_relative_time_to_string (h->retry_time,
+ GNUNET_YES));
+ /* notify client about all PUTs that (may) have failed due to disconnect */
+ while (NULL != (ph = h->put_head))
+ {
+ cont = ph->cont;
+ cont_cls = ph->cont_cls;
+ GNUNET_DHT_put_cancel (ph);
+ if (NULL != cont)
+ cont (cont_cls,
+ GNUNET_SYSERR);
+ }
+ GNUNET_assert (NULL == h->reconnect_task);
+ h->reconnect_task
+ = GNUNET_SCHEDULER_add_delayed (h->retry_time,
+ &try_reconnect,
+ h);
}
/**
- * Transmit the next pending message, called by notify_transmit_ready
+ * Generic error handler, called with the appropriate error code and
+ * the same closure specified at the creation of the message queue.
+ * Not every message queue implementation supports an error handler.
+ *
+ * @param cls closure with the `struct GNUNET_DHT_Handle *`
+ * @param error error code
*/
-static size_t
-transmit_pending (void *cls, size_t size, void *buf);
+static void
+mq_error_handler (void *cls,
+ enum GNUNET_MQ_Error error)
+{
+ struct GNUNET_DHT_Handle *h = cls;
+
+ do_disconnect (h);
+}
/**
- * Try to send messages from list of messages to send
+ * Verify integrity of a get monitor message from the service.
+ *
+ * @param cls The DHT handle.
+ * @param msg Monitor get message from the service.
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
*/
-static void
-process_pending_messages (struct GNUNET_DHT_Handle *handle)
+static int
+check_monitor_get (void *cls,
+ const struct GNUNET_DHT_MonitorGetMessage *msg)
{
- struct PendingMessage *head;
+ uint32_t plen = ntohl (msg->get_path_length);
+ uint16_t msize = ntohs (msg->header.size) - sizeof (*msg);
- if (handle->client == NULL)
+ if ( (plen > UINT16_MAX) ||
+ (plen * sizeof (struct GNUNET_HashCode) != msize) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "process_pending_messages called, but client is null, reconnecting\n");
- do_disconnect (handle);
- return;
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
}
- if (handle->th != NULL)
- return;
- if (NULL == (head = handle->pending_head))
- return;
- handle->th =
- GNUNET_CLIENT_notify_transmit_ready (handle->client,
- ntohs (head->msg->size),
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_YES, &transmit_pending,
- handle);
- if (NULL != handle->th)
- return;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "notify_transmit_ready returned NULL, reconnecting\n");
- do_disconnect (handle);
+ return GNUNET_OK;
}
/**
- * Transmit the next pending message, called by notify_transmit_ready
+ * Process a get monitor message from the service.
+ *
+ * @param cls The DHT handle.
+ * @param msg Monitor get message from the service.
*/
-static size_t
-transmit_pending (void *cls, size_t size, void *buf)
+static void
+handle_monitor_get (void *cls,
+ const struct GNUNET_DHT_MonitorGetMessage *msg)
{
struct GNUNET_DHT_Handle *handle = cls;
- struct PendingMessage *head;
- size_t tsize;
+ struct GNUNET_DHT_MonitorHandle *mh;
- handle->th = NULL;
- if (buf == NULL)
+ for (mh = handle->monitor_head; NULL != mh; mh = mh->next)
{
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Transmission to DHT service failed! Reconnecting!\n");
- do_disconnect (handle);
- return 0;
+ if (NULL == mh->get_cb)
+ continue;
+ if ( ( (GNUNET_BLOCK_TYPE_ANY == mh->type) ||
+ (mh->type == ntohl (msg->type)) ) &&
+ ( (NULL == mh->key) ||
+ (0 == memcmp (mh->key,
+ &msg->key,
+ sizeof (struct GNUNET_HashCode))) ) )
+ mh->get_cb (mh->cb_cls,
+ ntohl (msg->options),
+ (enum GNUNET_BLOCK_Type) ntohl(msg->type),
+ ntohl (msg->hop_count),
+ ntohl (msg->desired_replication_level),
+ ntohl (msg->get_path_length),
+ (struct GNUNET_PeerIdentity *) &msg[1],
+ &msg->key);
}
- if (NULL == (head = handle->pending_head))
- return 0;
+}
+
- tsize = ntohs (head->msg->size);
- if (size < tsize)
+/**
+ * Validate a get response monitor message from the service.
+ *
+ * @param cls The DHT handle.
+ * @param msg monitor get response message from the service
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
+ */
+static int
+check_monitor_get_resp (void *cls,
+ const struct GNUNET_DHT_MonitorGetRespMessage *msg)
+{
+ size_t msize = ntohs (msg->header.size) - sizeof (*msg);
+ uint32_t getl = ntohl (msg->get_path_length);
+ uint32_t putl = ntohl (msg->put_path_length);
+
+ if ( (getl + putl < getl) ||
+ ( (msize / sizeof (struct GNUNET_PeerIdentity)) < getl + putl) )
{
- process_pending_messages (handle);
- return 0;
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
}
- memcpy (buf, head->msg, tsize);
- GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
- head);
- head->in_pending_queue = GNUNET_NO;
- if (head->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a get response monitor message from the service.
+ *
+ * @param cls The DHT handle.
+ * @param msg monitor get response message from the service
+ */
+static void
+handle_monitor_get_resp (void *cls,
+ const struct GNUNET_DHT_MonitorGetRespMessage *msg)
+{
+ struct GNUNET_DHT_Handle *handle = cls;
+ size_t msize = ntohs (msg->header.size) - sizeof (*msg);
+ const struct GNUNET_PeerIdentity *path;
+ uint32_t getl = ntohl (msg->get_path_length);
+ uint32_t putl = ntohl (msg->put_path_length);
+ struct GNUNET_DHT_MonitorHandle *mh;
+
+ path = (const struct GNUNET_PeerIdentity *) &msg[1];
+ for (mh = handle->monitor_head; NULL != mh; mh = mh->next)
{
- GNUNET_SCHEDULER_cancel (head->timeout_task);
- head->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ if (NULL == mh->get_resp_cb)
+ continue;
+ if ( ( (GNUNET_BLOCK_TYPE_ANY == mh->type) ||
+ (mh->type == ntohl(msg->type)) ) &&
+ ( (NULL == mh->key) ||
+ (0 == memcmp (mh->key,
+ &msg->key,
+ sizeof (struct GNUNET_HashCode))) ) )
+ mh->get_resp_cb (mh->cb_cls,
+ (enum GNUNET_BLOCK_Type) ntohl (msg->type),
+ path,
+ getl,
+ &path[getl],
+ putl,
+ GNUNET_TIME_absolute_ntoh(msg->expiration_time),
+ &msg->key,
+ (const void *) &path[getl + putl],
+ msize - sizeof (struct GNUNET_PeerIdentity) * (putl + getl));
}
- if (NULL != head->cont)
+}
+
+
+/**
+ * Check validity of a put monitor message from the service.
+ *
+ * @param cls The DHT handle.
+ * @param msg Monitor put message from the service.
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
+ */
+static int
+check_monitor_put (void *cls,
+ const struct GNUNET_DHT_MonitorPutMessage *msg)
+{
+ size_t msize;
+ uint32_t putl;
+
+ msize = ntohs (msg->header.size) - sizeof (*msg);
+ putl = ntohl (msg->put_path_length);
+ if ((msize / sizeof (struct GNUNET_PeerIdentity)) < putl)
{
- GNUNET_SCHEDULER_add_continuation (head->cont, head->cont_cls,
- GNUNET_SCHEDULER_REASON_PREREQ_DONE);
- head->cont = NULL;
- head->cont_cls = NULL;
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
}
- if (GNUNET_YES == head->free_on_send)
- GNUNET_free (head);
- process_pending_messages (handle);
-#if DEBUG_DHT
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarded request of %u bytes to DHT service\n", (unsigned int) tsize);
-#endif
- if (GNUNET_NO == handle->in_receive)
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a put monitor message from the service.
+ *
+ * @param cls The DHT handle.
+ * @param msg Monitor put message from the service.
+ */
+static void
+handle_monitor_put (void *cls,
+ const struct GNUNET_DHT_MonitorPutMessage *msg)
+{
+ struct GNUNET_DHT_Handle *handle = cls;
+ size_t msize = ntohs (msg->header.size) - sizeof (*msg);
+ uint32_t putl = ntohl (msg->put_path_length);
+ const struct GNUNET_PeerIdentity *path;
+ struct GNUNET_DHT_MonitorHandle *mh;
+
+ path = (const struct GNUNET_PeerIdentity *) &msg[1];
+ for (mh = handle->monitor_head; NULL != mh; mh = mh->next)
{
-#if DEBUG_DHT
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting to process replies from DHT\n");
-#endif
- handle->in_receive = GNUNET_YES;
- GNUNET_CLIENT_receive (handle->client, &service_message_handler, handle,
- GNUNET_TIME_UNIT_FOREVER_REL);
+ if (NULL == mh->put_cb)
+ continue;
+ if ( ( (GNUNET_BLOCK_TYPE_ANY == mh->type) ||
+ (mh->type == ntohl(msg->type)) ) &&
+ ( (NULL == mh->key) ||
+ (0 == memcmp (mh->key,
+ &msg->key,
+ sizeof (struct GNUNET_HashCode))) ) )
+ mh->put_cb (mh->cb_cls,
+ ntohl (msg->options),
+ (enum GNUNET_BLOCK_Type) ntohl(msg->type),
+ ntohl (msg->hop_count),
+ ntohl (msg->desired_replication_level),
+ putl,
+ path,
+ GNUNET_TIME_absolute_ntoh(msg->expiration_time),
+ &msg->key,
+ (const void *) &path[putl],
+ msize - sizeof (struct GNUNET_PeerIdentity) * putl);
}
- return tsize;
}
/**
- * Process a given reply that might match the given
- * request.
+ * Verify that client result message received from the service is well-formed.
*
- * @param cls the 'struct GNUNET_DHT_ClientResultMessage'
+ * @param cls The DHT handle.
+ * @param msg Monitor put message from the service.
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
+ */
+static int
+check_client_result (void *cls,
+ const struct GNUNET_DHT_ClientResultMessage *msg)
+{
+ size_t msize = ntohs (msg->header.size) - sizeof (*msg);
+ uint32_t put_path_length = ntohl (msg->put_path_length);
+ uint32_t get_path_length = ntohl (msg->get_path_length);
+ size_t meta_length;
+
+ meta_length =
+ sizeof (struct GNUNET_PeerIdentity) * (get_path_length + put_path_length);
+ if ( (msize < meta_length) ||
+ (get_path_length >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
+ (put_path_length >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) )
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a given reply that might match the given request.
+ *
+ * @param cls the `struct GNUNET_DHT_ClientResultMessage`
* @param key query of the request
- * @param value the 'struct GNUNET_DHT_RouteHandle' of a request matching the same key
- * @return GNUNET_YES to continue to iterate over all results,
- * GNUNET_NO if the reply is malformed
+ * @param value the `struct GNUNET_DHT_GetHandle` of a request matching the same key
+ * @return #GNUNET_YES to continue to iterate over all results
*/
static int
-process_reply (void *cls, const GNUNET_HashCode * key, void *value)
+process_client_result (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
- const struct GNUNET_DHT_ClientResultMessage *dht_msg = cls;
+ const struct GNUNET_DHT_ClientResultMessage *crm = cls;
struct GNUNET_DHT_GetHandle *get_handle = value;
+ size_t msize = ntohs (crm->header.size) - sizeof (*crm);
+ uint32_t put_path_length = ntohl (crm->put_path_length);
+ uint32_t get_path_length = ntohl (crm->get_path_length);
const struct GNUNET_PeerIdentity *put_path;
const struct GNUNET_PeerIdentity *get_path;
- uint32_t put_path_length;
- uint32_t get_path_length;
+ struct GNUNET_HashCode hc;
size_t data_length;
- size_t msize;
size_t meta_length;
const void *data;
- if (dht_msg->unique_id != get_handle->unique_id)
+ if (crm->unique_id != get_handle->unique_id)
{
/* UID mismatch */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Ignoring reply for %s: UID mismatch: %llu/%llu\n",
- GNUNET_h2s (key),
- dht_msg->unique_id, get_handle->unique_id);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Ignoring reply for %s: UID mismatch: %llu/%llu\n",
+ GNUNET_h2s (key),
+ crm->unique_id,
+ get_handle->unique_id);
return GNUNET_YES;
}
- msize = ntohs (dht_msg->header.size);
- put_path_length = ntohl (dht_msg->put_path_length);
- get_path_length = ntohl (dht_msg->get_path_length);
+ /* FIXME: might want to check that type matches */
meta_length =
- sizeof (struct GNUNET_DHT_ClientResultMessage) +
sizeof (struct GNUNET_PeerIdentity) * (get_path_length + put_path_length);
- if ((msize < meta_length) ||
- (get_path_length >
- GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
- (put_path_length >
- GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
- {
- GNUNET_break (0);
- return GNUNET_NO;
- }
data_length = msize - meta_length;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
"Giving %u byte reply for %s to application\n",
(unsigned int) data_length,
GNUNET_h2s (key));
- put_path = (const struct GNUNET_PeerIdentity *) &dht_msg[1];
+ put_path = (const struct GNUNET_PeerIdentity *) &crm[1];
get_path = &put_path[put_path_length];
data = &get_path[get_path_length];
+ /* remember that we've seen this result */
+ GNUNET_CRYPTO_hash (data,
+ data_length,
+ &hc);
+ if (get_handle->seen_results_size == get_handle->seen_results_end)
+ GNUNET_array_grow (get_handle->seen_results,
+ get_handle->seen_results_size,
+ get_handle->seen_results_size * 2 + 1);
+ get_handle->seen_results[get_handle->seen_results_end++] = hc;
+ /* no need to block it explicitly, service already knows about it! */
get_handle->iter (get_handle->iter_cls,
- GNUNET_TIME_absolute_ntoh (dht_msg->expiration), key,
- get_path, get_path_length, put_path, put_path_length,
- ntohl (dht_msg->type), data_length, data);
+ GNUNET_TIME_absolute_ntoh (crm->expiration),
+ key,
+ get_path,
+ get_path_length,
+ put_path,
+ put_path_length,
+ ntohl (crm->type),
+ data_length,
+ data);
return GNUNET_YES;
}
/**
- * Handler for messages received from the DHT service
- * a demultiplexer which handles numerous message types
+ * Process a client result message received from the service.
*
- * @param cls the 'struct GNUNET_DHT_Handle'
- * @param msg the incoming message
+ * @param cls The DHT handle.
+ * @param msg Monitor put message from the service.
*/
static void
-service_message_handler (void *cls, const struct GNUNET_MessageHeader *msg)
+handle_client_result (void *cls,
+ const struct GNUNET_DHT_ClientResultMessage *msg)
{
struct GNUNET_DHT_Handle *handle = cls;
- const struct GNUNET_DHT_ClientResultMessage *dht_msg;
- if (msg == NULL)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Error receiving data from DHT service, reconnecting\n");
- do_disconnect (handle);
- return;
- }
- if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT)
- {
- GNUNET_break (0);
- do_disconnect (handle);
+ GNUNET_CONTAINER_multihashmap_get_multiple (handle->active_requests,
+ &msg->key,
+ &process_client_result,
+ (void *) msg);
+}
+
+
+/**
+ * Process a put confirmation message from the service.
+ *
+ * @param cls The DHT handle.
+ * @param msg confirmation message from the service.
+ */
+static void
+handle_put_confirmation (void *cls,
+ const struct GNUNET_DHT_ClientPutConfirmationMessage *msg)
+{
+ struct GNUNET_DHT_Handle *handle = cls;
+ struct GNUNET_DHT_PutHandle *ph;
+ GNUNET_DHT_PutContinuation cont;
+ void *cont_cls;
+
+ for (ph = handle->put_head; NULL != ph; ph = ph->next)
+ if (ph->unique_id == msg->unique_id)
+ break;
+ if (NULL == ph)
return;
- }
- if (ntohs (msg->size) < sizeof (struct GNUNET_DHT_ClientResultMessage))
+ cont = ph->cont;
+ cont_cls = ph->cont_cls;
+ GNUNET_DHT_put_cancel (ph);
+ if (NULL != cont)
+ cont (cont_cls,
+ GNUNET_OK);
+}
+
+
+/**
+ * Try to (re)connect to the DHT service.
+ *
+ * @param h DHT handle to reconnect
+ * @return #GNUNET_YES on success, #GNUNET_NO on failure.
+ */
+static int
+try_connect (struct GNUNET_DHT_Handle *h)
+{
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_var_size (monitor_get,
+ GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET,
+ struct GNUNET_DHT_MonitorGetMessage,
+ h),
+ GNUNET_MQ_hd_var_size (monitor_get_resp,
+ GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET_RESP,
+ struct GNUNET_DHT_MonitorGetRespMessage,
+ h),
+ GNUNET_MQ_hd_var_size (monitor_put,
+ GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT,
+ struct GNUNET_DHT_MonitorPutMessage,
+ h),
+ GNUNET_MQ_hd_var_size (client_result,
+ GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT,
+ struct GNUNET_DHT_ClientResultMessage,
+ h),
+ GNUNET_MQ_hd_fixed_size (put_confirmation,
+ GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT_OK,
+ struct GNUNET_DHT_ClientPutConfirmationMessage,
+ h),
+ GNUNET_MQ_handler_end ()
+ };
+ if (NULL != h->mq)
+ return GNUNET_OK;
+ h->mq = GNUNET_CLIENT_connect (h->cfg,
+ "dht",
+ handlers,
+ &mq_error_handler,
+ h);
+ if (NULL == h->mq)
{
- GNUNET_break (0);
- do_disconnect (handle);
- return;
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "Failed to connect to the DHT service!\n");
+ return GNUNET_NO;
}
- dht_msg = (const struct GNUNET_DHT_ClientResultMessage *) msg;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received reply for `%s' from DHT service %p\n",
- GNUNET_h2s (&dht_msg->key),
- handle);
- GNUNET_CONTAINER_multihashmap_get_multiple (handle->active_requests,
- &dht_msg->key, &process_reply,
- (void *) dht_msg);
- GNUNET_CLIENT_receive (handle->client, &service_message_handler, handle,
- GNUNET_TIME_UNIT_FOREVER_REL);
+ return GNUNET_YES;
}
* @param cfg configuration to use
* @param ht_len size of the internal hash table to use for
* processing multiple GET/FIND requests in parallel
- *
* @return handle to the DHT service, or NULL on error
*/
struct GNUNET_DHT_Handle *
{
struct GNUNET_DHT_Handle *handle;
- handle = GNUNET_malloc (sizeof (struct GNUNET_DHT_Handle));
+ handle = GNUNET_new (struct GNUNET_DHT_Handle);
handle->cfg = cfg;
- handle->uid_gen =
- GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT64_MAX);
- handle->active_requests = GNUNET_CONTAINER_multihashmap_create (ht_len);
+ handle->uid_gen
+ = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
+ UINT64_MAX);
+ handle->active_requests
+ = GNUNET_CONTAINER_multihashmap_create (ht_len,
+ GNUNET_YES);
if (GNUNET_NO == try_connect (handle))
{
GNUNET_DHT_disconnect (handle);
void
GNUNET_DHT_disconnect (struct GNUNET_DHT_Handle *handle)
{
- struct PendingMessage *pm;
+ struct GNUNET_DHT_PutHandle *ph;
- GNUNET_assert (handle != NULL);
GNUNET_assert (0 ==
GNUNET_CONTAINER_multihashmap_size (handle->active_requests));
- if (handle->th != NULL)
+ while (NULL != (ph = handle->put_head))
{
- GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
- handle->th = NULL;
+ if (NULL != ph->cont)
+ ph->cont (ph->cont_cls,
+ GNUNET_SYSERR);
+ GNUNET_DHT_put_cancel (ph);
}
- while (NULL != (pm = handle->pending_head))
+ if (NULL != handle->mq)
{
- GNUNET_assert (GNUNET_YES == pm->in_pending_queue);
- GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
- pm);
- pm->in_pending_queue = GNUNET_NO;
- GNUNET_assert (GNUNET_YES == pm->free_on_send);
- if (GNUNET_SCHEDULER_NO_TASK != pm->timeout_task)
- GNUNET_SCHEDULER_cancel (pm->timeout_task);
- if (NULL != pm->cont)
- GNUNET_SCHEDULER_add_continuation (pm->cont, pm->cont_cls,
- GNUNET_SCHEDULER_REASON_TIMEOUT);
- GNUNET_free (pm);
+ GNUNET_MQ_destroy (handle->mq);
+ handle->mq = NULL;
}
- if (handle->client != NULL)
+ if (NULL != handle->reconnect_task)
{
- GNUNET_CLIENT_disconnect (handle->client, GNUNET_YES);
- handle->client = NULL;
- }
- if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
GNUNET_SCHEDULER_cancel (handle->reconnect_task);
+ handle->reconnect_task = NULL;
+ }
GNUNET_CONTAINER_multihashmap_destroy (handle->active_requests);
GNUNET_free (handle);
}
/**
- * Timeout for the transmission of a fire&forget-request. Clean it up.
- *
- * @param cls the 'struct PendingMessage'
- * @param tc scheduler context
- */
-static void
-timeout_put_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct PendingMessage *pending = cls;
- struct GNUNET_DHT_Handle *handle;
-
- handle = pending->handle;
- GNUNET_assert (GNUNET_YES == pending->in_pending_queue);
- GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
- pending);
- pending->in_pending_queue = GNUNET_NO;
- if (pending->cont != NULL)
- pending->cont (pending->cont_cls, tc);
- GNUNET_free (pending);
-}
-
-
-/**
- * Perform a PUT operation storing data in the DHT.
+ * Perform a PUT operation storing data in the DHT. FIXME: we should
+ * change the protocol to get a confirmation for the PUT from the DHT
+ * and call 'cont' only after getting the confirmation; otherwise, the
+ * client has no good way of telling if the 'PUT' message actually got
+ * to the DHT service!
*
* @param handle handle to DHT service
* @param key the key to store under
* @param size number of bytes in data; must be less than 64k
* @param data the data to store
* @param exp desired expiration time for the value
- * @param timeout how long to wait for transmission of this request
* @param cont continuation to call when done (transmitting request to service)
- * @param cont_cls closure for cont
+ * You must not call #GNUNET_DHT_disconnect in this continuation
+ * @param cont_cls closure for @a cont
*/
-void
-GNUNET_DHT_put (struct GNUNET_DHT_Handle *handle, const GNUNET_HashCode * key,
+struct GNUNET_DHT_PutHandle *
+GNUNET_DHT_put (struct GNUNET_DHT_Handle *handle,
+ const struct GNUNET_HashCode *key,
uint32_t desired_replication_level,
enum GNUNET_DHT_RouteOption options,
- enum GNUNET_BLOCK_Type type, size_t size, const char *data,
+ enum GNUNET_BLOCK_Type type,
+ size_t size,
+ const void *data,
struct GNUNET_TIME_Absolute exp,
- struct GNUNET_TIME_Relative timeout, GNUNET_SCHEDULER_Task cont,
+ GNUNET_DHT_PutContinuation cont,
void *cont_cls)
{
+ struct GNUNET_MQ_Envelope *env;
struct GNUNET_DHT_ClientPutMessage *put_msg;
size_t msize;
- struct PendingMessage *pending;
+ struct GNUNET_DHT_PutHandle *ph;
msize = sizeof (struct GNUNET_DHT_ClientPutMessage) + size;
if ((msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
(size >= GNUNET_SERVER_MAX_MESSAGE_SIZE))
{
GNUNET_break (0);
- if (NULL != cont)
- cont (cont_cls, NULL);
- return;
+ return NULL;
}
- pending = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
- put_msg = (struct GNUNET_DHT_ClientPutMessage *) &pending[1];
- pending->msg = &put_msg->header;
- pending->handle = handle;
- pending->cont = cont;
- pending->cont_cls = cont_cls;
- pending->free_on_send = GNUNET_YES;
- pending->timeout_task =
- GNUNET_SCHEDULER_add_delayed (timeout, &timeout_put_request, pending);
- put_msg->header.size = htons (msize);
- put_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT);
- put_msg->type = htonl (type);
+ if (NULL == handle->mq)
+ return NULL;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending PUT for %s to DHT via %p\n",
+ GNUNET_h2s (key),
+ handle);
+ ph = GNUNET_new (struct GNUNET_DHT_PutHandle);
+ ph->dht_handle = handle;
+ ph->cont = cont;
+ ph->cont_cls = cont_cls;
+ ph->unique_id = ++handle->uid_gen;
+ GNUNET_CONTAINER_DLL_insert_tail (handle->put_head,
+ handle->put_tail,
+ ph);
+ env = GNUNET_MQ_msg_extra (put_msg,
+ size,
+ GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT);
+ put_msg->type = htonl ((uint32_t) type);
put_msg->options = htonl ((uint32_t) options);
put_msg->desired_replication_level = htonl (desired_replication_level);
+ put_msg->unique_id = ph->unique_id;
put_msg->expiration = GNUNET_TIME_absolute_hton (exp);
put_msg->key = *key;
- memcpy (&put_msg[1], data, size);
- GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
- pending);
- pending->in_pending_queue = GNUNET_YES;
- process_pending_messages (handle);
+ GNUNET_memcpy (&put_msg[1],
+ data,
+ size);
+ GNUNET_MQ_send (handle->mq,
+ env);
+ return ph;
+}
+
+
+/**
+ * Cancels a DHT PUT operation. Note that the PUT request may still
+ * go out over the network (we can't stop that); However, if the PUT
+ * has not yet been sent to the service, cancelling the PUT will stop
+ * this from happening (but there is no way for the user of this API
+ * to tell if that is the case). The only use for this API is to
+ * prevent a later call to 'cont' from #GNUNET_DHT_put (i.e. because
+ * the system is shutting down).
+ *
+ * @param ph put operation to cancel ('cont' will no longer be called)
+ */
+void
+GNUNET_DHT_put_cancel (struct GNUNET_DHT_PutHandle *ph)
+{
+ struct GNUNET_DHT_Handle *handle = ph->dht_handle;
+
+ GNUNET_CONTAINER_DLL_remove (handle->put_head,
+ handle->put_tail,
+ ph);
+ GNUNET_free (ph);
}
/**
* Perform an asynchronous GET operation on the DHT identified. See
- * also "GNUNET_BLOCK_evaluate".
+ * also #GNUNET_BLOCK_evaluate.
*
* @param handle handle to the DHT service
- * @param timeout how long to wait for transmission of this request to the service
* @param type expected type of the response object
* @param key the key to look up
* @param desired_replication_level estimate of how many
nearest peers this request should reach
* @param options routing options for this message
* @param xquery extended query data (can be NULL, depending on type)
- * @param xquery_size number of bytes in xquery
+ * @param xquery_size number of bytes in @a xquery
* @param iter function to call on each result
- * @param iter_cls closure for iter
+ * @param iter_cls closure for @a iter
* @return handle to stop the async get
*/
struct GNUNET_DHT_GetHandle *
GNUNET_DHT_get_start (struct GNUNET_DHT_Handle *handle,
- struct GNUNET_TIME_Relative timeout,
- enum GNUNET_BLOCK_Type type, const GNUNET_HashCode * key,
+ enum GNUNET_BLOCK_Type type,
+ const struct GNUNET_HashCode *key,
uint32_t desired_replication_level,
- enum GNUNET_DHT_RouteOption options, const void *xquery,
- size_t xquery_size, GNUNET_DHT_GetIterator iter,
+ enum GNUNET_DHT_RouteOption options,
+ const void *xquery,
+ size_t xquery_size,
+ GNUNET_DHT_GetIterator iter,
void *iter_cls)
{
- struct GNUNET_DHT_ClientGetMessage *get_msg;
- struct GNUNET_DHT_GetHandle *get_handle;
+ struct GNUNET_DHT_GetHandle *gh;
size_t msize;
- struct PendingMessage *pending;
msize = sizeof (struct GNUNET_DHT_ClientGetMessage) + xquery_size;
if ((msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
"Sending query for %s to DHT %p\n",
GNUNET_h2s (key),
handle);
- pending = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
- get_msg = (struct GNUNET_DHT_ClientGetMessage *) &pending[1];
- pending->msg = &get_msg->header;
- pending->handle = handle;
- pending->free_on_send = GNUNET_NO;
- get_msg->header.size = htons (msize);
- get_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET);
- get_msg->options = htonl ((uint32_t) options);
- get_msg->desired_replication_level = htonl (desired_replication_level);
- get_msg->type = htonl (type);
- get_msg->key = *key;
- handle->uid_gen++;
- get_msg->unique_id = handle->uid_gen;
- memcpy (&get_msg[1], xquery, xquery_size);
- GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
- pending);
- pending->in_pending_queue = GNUNET_YES;
- get_handle = GNUNET_malloc (sizeof (struct GNUNET_DHT_GetHandle));
- get_handle->iter = iter;
- get_handle->iter_cls = iter_cls;
- get_handle->message = pending;
- get_handle->unique_id = get_msg->unique_id;
- GNUNET_CONTAINER_multihashmap_put (handle->active_requests, key, get_handle,
+ gh = GNUNET_malloc (sizeof (struct GNUNET_DHT_GetHandle) +
+ xquery_size);
+ gh->iter = iter;
+ gh->iter_cls = iter_cls;
+ gh->dht_handle = handle;
+ gh->key = *key;
+ gh->unique_id = ++handle->uid_gen;
+ gh->xquery_size = xquery_size;
+ gh->desired_replication_level = desired_replication_level;
+ gh->type = type;
+ gh->options = options;
+ GNUNET_memcpy (&gh[1],
+ xquery,
+ xquery_size);
+ GNUNET_CONTAINER_multihashmap_put (handle->active_requests,
+ &gh->key,
+ gh,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- process_pending_messages (handle);
- return get_handle;
+ if (NULL != handle->mq)
+ send_get (gh);
+ return gh;
+}
+
+
+/**
+ * Tell the DHT not to return any of the following known results
+ * to this client.
+ *
+ * @param get_handle get operation for which results should be filtered
+ * @param num_results number of results to be blocked that are
+ * provided in this call (size of the @a results array)
+ * @param results array of hash codes over the 'data' of the results
+ * to be blocked
+ */
+void
+GNUNET_DHT_get_filter_known_results (struct GNUNET_DHT_GetHandle *get_handle,
+ unsigned int num_results,
+ const struct GNUNET_HashCode *results)
+{
+ unsigned int needed;
+ unsigned int had;
+
+ had = get_handle->seen_results_end;
+ needed = had + num_results;
+ if (needed > get_handle->seen_results_size)
+ GNUNET_array_grow (get_handle->seen_results,
+ get_handle->seen_results_size,
+ needed);
+ GNUNET_memcpy (&get_handle->seen_results[get_handle->seen_results_end],
+ results,
+ num_results * sizeof (struct GNUNET_HashCode));
+ get_handle->seen_results_end += num_results;
+ if (NULL != get_handle->dht_handle->mq)
+ send_get_known_results (get_handle,
+ had);
}
void
GNUNET_DHT_get_stop (struct GNUNET_DHT_GetHandle *get_handle)
{
- struct GNUNET_DHT_Handle *handle;
- const struct GNUNET_DHT_ClientGetMessage *get_msg;
- struct GNUNET_DHT_ClientGetStopMessage *stop_msg;
- struct PendingMessage *pending;
+ struct GNUNET_DHT_Handle *handle = get_handle->dht_handle;
- handle = get_handle->message->handle;
- get_msg =
- (const struct GNUNET_DHT_ClientGetMessage *) get_handle->message->msg;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Sending STOP for %s to DHT via %p\n",
- GNUNET_h2s (&get_msg->key),
+ GNUNET_h2s (&get_handle->key),
handle);
- /* generate STOP */
- pending =
- GNUNET_malloc (sizeof (struct PendingMessage) +
- sizeof (struct GNUNET_DHT_ClientGetStopMessage));
- stop_msg = (struct GNUNET_DHT_ClientGetStopMessage *) &pending[1];
- pending->msg = &stop_msg->header;
- pending->handle = handle;
- pending->free_on_send = GNUNET_YES;
- stop_msg->header.size =
- htons (sizeof (struct GNUNET_DHT_ClientGetStopMessage));
- stop_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP);
- stop_msg->reserved = htonl (0);
- stop_msg->unique_id = get_msg->unique_id;
- stop_msg->key = get_msg->key;
- GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
- pending);
- pending->in_pending_queue = GNUNET_YES;
-
- /* remove 'GET' from active status */
+ if (NULL != handle->mq)
+ {
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_DHT_ClientGetStopMessage *stop_msg;
+
+ env = GNUNET_MQ_msg (stop_msg,
+ GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP);
+ stop_msg->reserved = htonl (0);
+ stop_msg->unique_id = get_handle->unique_id;
+ stop_msg->key = get_handle->key;
+ GNUNET_MQ_send (handle->mq,
+ env);
+ }
GNUNET_assert (GNUNET_YES ==
GNUNET_CONTAINER_multihashmap_remove (handle->active_requests,
- &get_msg->key,
+ &get_handle->key,
get_handle));
- if (GNUNET_YES == get_handle->message->in_pending_queue)
+ GNUNET_array_grow (get_handle->seen_results,
+ get_handle->seen_results_end,
+ 0);
+ GNUNET_free (get_handle);
+}
+
+
+/**
+ * Start monitoring the local DHT service.
+ *
+ * @param handle Handle to the DHT service.
+ * @param type Type of blocks that are of interest.
+ * @param key Key of data of interest, NULL for all.
+ * @param get_cb Callback to process monitored get messages.
+ * @param get_resp_cb Callback to process monitored get response messages.
+ * @param put_cb Callback to process monitored put messages.
+ * @param cb_cls Closure for callbacks.
+ * @return Handle to stop monitoring.
+ */
+struct GNUNET_DHT_MonitorHandle *
+GNUNET_DHT_monitor_start (struct GNUNET_DHT_Handle *handle,
+ enum GNUNET_BLOCK_Type type,
+ const struct GNUNET_HashCode *key,
+ GNUNET_DHT_MonitorGetCB get_cb,
+ GNUNET_DHT_MonitorGetRespCB get_resp_cb,
+ GNUNET_DHT_MonitorPutCB put_cb,
+ void *cb_cls)
+{
+ struct GNUNET_DHT_MonitorHandle *mh;
+
+ mh = GNUNET_new (struct GNUNET_DHT_MonitorHandle);
+ mh->get_cb = get_cb;
+ mh->get_resp_cb = get_resp_cb;
+ mh->put_cb = put_cb;
+ mh->cb_cls = cb_cls;
+ mh->type = type;
+ mh->dht_handle = handle;
+ if (NULL != key)
{
- GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
- get_handle->message);
- get_handle->message->in_pending_queue = GNUNET_NO;
+ mh->key = GNUNET_new (struct GNUNET_HashCode);
+ *mh->key = *key;
}
- GNUNET_free (get_handle->message);
- GNUNET_free (get_handle);
+ GNUNET_CONTAINER_DLL_insert (handle->monitor_head,
+ handle->monitor_tail,
+ mh);
+ if (NULL != handle->mq)
+ send_monitor_start (mh);
+ return mh;
+}
+
- process_pending_messages (handle);
+/**
+ * Stop monitoring.
+ *
+ * @param mh The handle to the monitor request returned by monitor_start.
+ *
+ * On return get_handle will no longer be valid, caller must not use again!!!
+ */
+void
+GNUNET_DHT_monitor_stop (struct GNUNET_DHT_MonitorHandle *mh)
+{
+ struct GNUNET_DHT_Handle *handle = mh->dht_handle;
+ struct GNUNET_DHT_MonitorStartStopMessage *m;
+ struct GNUNET_MQ_Envelope *env;
+
+ GNUNET_CONTAINER_DLL_remove (handle->monitor_head,
+ handle->monitor_tail,
+ mh);
+ env = GNUNET_MQ_msg (m,
+ GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP);
+ m->type = htonl (mh->type);
+ m->get = htons (NULL != mh->get_cb);
+ m->get_resp = htons(NULL != mh->get_resp_cb);
+ m->put = htons (NULL != mh->put_cb);
+ if (NULL != mh->key)
+ {
+ m->filter_key = htons (1);
+ m->key = *mh->key;
+ }
+ GNUNET_MQ_send (handle->mq,
+ env);
+ GNUNET_free_non_null (mh->key);
+ GNUNET_free (mh);
}
projects / oweals / gnunet.git / blobdiff