/*
This file is part of GNUnet.
- (C) 2001, 2002, 2004, 2005, 2007, 2009 Christian Grothoff (and other contributing authors)
+ (C) 2001, 2002, 2004, 2005, 2007, 2009, 2010 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
* @file peerinfo/peerinfo_api.c
* @brief API to access peerinfo service
* @author Christian Grothoff
- *
- * TODO:
- * - document NEW API implementation
- * - add timeout for iteration
- * - implement cancellation of iteration
*/
#include "platform.h"
#include "gnunet_client_lib.h"
#include "peerinfo.h"
/**
- *
+ * Function to call after transmission has succeeded.
+ *
+ * @param cls closure
+ * @param success GNUNET_OK if transmission worked, GNUNET_SYSERR on error
*/
typedef void (*TransmissionContinuation)(void *cls,
int success);
/**
- *
+ * Entry in the transmission queue to PEERINFO service.
*/
struct TransmissionQueueEntry
{
/**
- *
+ * This is a linked list.
*/
struct TransmissionQueueEntry *next;
/**
- *
+ * This is a linked list.
*/
struct TransmissionQueueEntry *prev;
/**
- *
+ * Function to call after request has been transmitted, or NULL (in which
+ * case we must consider sending the next entry immediately).
*/
TransmissionContinuation cont;
/**
- *
+ * Closure for 'cont'.
*/
void *cont_cls;
/**
- *
+ * Timeout for the operation.
*/
struct GNUNET_TIME_Absolute timeout;
/**
- *
+ * Number of bytes of the request message (follows after this struct).
*/
size_t size;
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Our scheduler.
- */
- struct GNUNET_SCHEDULER_Handle *sched;
-
/**
* Connection to the service.
*/
struct GNUNET_CLIENT_Connection *client;
/**
- *
+ * Head of transmission queue.
*/
struct TransmissionQueueEntry *tq_head;
/**
- *
+ * Tail of transmission queue.
*/
struct TransmissionQueueEntry *tq_tail;
/**
- *
+ * Handle for the current transmission request, or NULL if none is pending.
*/
struct GNUNET_CLIENT_TransmitHandle *th;
+
+ /**
+ * Set to GNUNET_YES if we are currently receiving replies from the
+ * service.
+ */
+ int in_receive;
+
};
* Connect to the peerinfo service.
*
* @param cfg configuration to use
- * @param sched scheduler to use
* @return NULL on error (configuration related, actual connection
- * etablishment may happen asynchronously).
+ * establishment may happen asynchronously).
*/
struct GNUNET_PEERINFO_Handle *
-GNUNET_PEERINFO_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
- struct GNUNET_SCHEDULER_Handle *sched)
+GNUNET_PEERINFO_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_CLIENT_Connection *client;
struct GNUNET_PEERINFO_Handle *ret;
- client = GNUNET_CLIENT_connect (sched, "peerinfo", cfg);
+ client = GNUNET_CLIENT_connect ("peerinfo", cfg);
if (client == NULL)
return NULL;
ret = GNUNET_malloc (sizeof (struct GNUNET_PEERINFO_Handle));
ret->client = client;
ret->cfg = cfg;
- ret->sched = sched;
return ret;
}
tqe->cont (tqe->cont_cls, GNUNET_SYSERR);
GNUNET_free (tqe);
}
+ if (h->th != NULL)
+ {
+ GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
+ h->th = NULL;
+ }
GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
GNUNET_free (h);
}
/**
+ * Check if we have a request pending in the transmission queue and are
+ * able to transmit it right now. If so, schedule transmission.
*
+ * @param h handle to the service
*/
static void
trigger_transmit (struct GNUNET_PEERINFO_Handle *h);
/**
+ * Close the existing connection to PEERINFO and reconnect.
*
+ * @param h handle to the service
*/
static void
reconnect (struct GNUNET_PEERINFO_Handle *h)
{
GNUNET_CLIENT_disconnect (h->client, GNUNET_SYSERR);
- h->client = GNUNET_CLIENT_connect (h->sched, "client", h->cfg);
+ h->th = NULL;
+ h->client = GNUNET_CLIENT_connect ("peerinfo", h->cfg);
GNUNET_assert (h->client != NULL);
}
/**
+ * Transmit the request at the head of the transmission queue
+ * and trigger continuation (if any).
*
+ * @param cls the 'struct GNUNET_PEERINFO_Handle' (with the queue)
+ * @param size size of the buffer (0 on error)
+ * @param buf where to copy the message
+ * @return number of bytes copied to buf
*/
static size_t
do_transmit (void *cls, size_t size, void *buf)
h->th = NULL;
if (buf == NULL)
{
-#if DEBUG_PEERINFO
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _
- ("Failed to transmit message of type %u to `%s' service.\n"),
- ntohs (msg->type), "peerinfo");
-#endif
- GNUNET_CONTAINER_DLL_remove (h->tq_head,
- h->tq_tail,
- tqe);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
+ _("Failed to transmit message to `%s' service.\n"),
+ "PEERINFO");
+ if (tqe != NULL)
+ GNUNET_CONTAINER_DLL_remove (h->tq_head,
+ h->tq_tail,
+ tqe);
reconnect (h);
trigger_transmit (h);
- if (tqe->cont != NULL)
- tqe->cont (tqe->cont_cls, GNUNET_SYSERR);
- GNUNET_free (tqe);
+ if (tqe != NULL)
+ {
+ if (tqe->cont != NULL)
+ tqe->cont (tqe->cont_cls, GNUNET_SYSERR);
+ GNUNET_free (tqe);
+ }
return 0;
}
+ /* If it can be NULL above, it can be NULL here to... */
+ if (tqe == NULL)
+ return 0;
+
ret = tqe->size;
GNUNET_assert (size >= ret);
memcpy (buf, &tqe[1], ret);
- GNUNET_CONTAINER_DLL_remove (h->tq_head,
+#if DEBUG_PEERINFO
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting request of size %u to `%s' service.\n",
+ ret,
+ "PEERINFO");
+#endif
+ GNUNET_CONTAINER_DLL_remove (h->tq_head,
h->tq_tail,
tqe);
if (tqe->cont != NULL)
}
+/**
+ * Check if we have a request pending in the transmission queue and are
+ * able to transmit it right now. If so, schedule transmission.
+ *
+ * @param h handle to the service
+ */
static void
trigger_transmit (struct GNUNET_PEERINFO_Handle *h)
{
struct TransmissionQueueEntry *tqe;
if (NULL == (tqe = h->tq_head))
- return;
+ return NULL;
if (h->th != NULL)
- return;
+ return NULL;
+ if (h->in_receive == GNUNET_YES)
+ return NULL;
h->th = GNUNET_CLIENT_notify_transmit_ready (h->client,
tqe->size,
GNUNET_TIME_absolute_get_remaining (tqe->timeout),
* merge the two HELLOs prior to transmission to the service.
*
* @param h handle to the peerinfo service
- * @param peer identity of the peer
* @param hello the verified (!) HELLO message
*/
void
-GNUNET_PEERINFO_add_peer_new (struct GNUNET_PEERINFO_Handle *h,
- const struct GNUNET_HELLO_Message *hello)
+GNUNET_PEERINFO_add_peer (struct GNUNET_PEERINFO_Handle *h,
+ const struct GNUNET_HELLO_Message *hello)
{
uint16_t hs = GNUNET_HELLO_size (hello);
struct TransmissionQueueEntry *tqe;
}
-
/**
- *
+ * Context for an iteration request.
*/
-struct GNUNET_PEERINFO_NewIteratorContext
+struct GNUNET_PEERINFO_IteratorContext
{
/**
- *
+ * Handle to the PEERINFO service.
*/
struct GNUNET_PEERINFO_Handle *h;
/**
- *
+ * Function to call with the results.
*/
GNUNET_PEERINFO_Processor callback;
/**
- *
+ * Closure for 'callback'.
*/
void *callback_cls;
/**
- *
+ * Our entry in the transmission queue.
+ */
+ struct TransmissionQueueEntry *tqe;
+
+ /**
+ * Task responsible for timeout.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+
+ /**
+ * Timeout for the operation.
*/
struct GNUNET_TIME_Absolute timeout;
-};
+ /**
+ * Are we now receiving?
+ */
+ int in_receive;
+};
/**
static void
peerinfo_handler (void *cls, const struct GNUNET_MessageHeader *msg)
{
- struct GNUNET_PEERINFO_NewIteratorContext *ic = cls;
+ struct GNUNET_PEERINFO_IteratorContext *ic = cls;
const struct InfoMessage *im;
const struct GNUNET_HELLO_Message *hello;
uint16_t ms;
+ ic->h->in_receive = GNUNET_NO;
if (msg == NULL)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
_("Failed to receive response from `%s' service.\n"),
- "peerinfo");
+ "PEERINFO");
reconnect (ic->h);
trigger_transmit (ic->h);
- ic->callback (ic->callback_cls, NULL, NULL, 1);
+ if (ic->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (ic->timeout_task);
+ if (ic->callback != NULL)
+ ic->callback (ic->callback_cls, NULL, NULL);
GNUNET_free (ic);
return;
}
{
#if DEBUG_PEERINFO
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received end of list of peers from peerinfo database\n");
+ "Received end of list of peers from `%s' service\n",
+ "PEERINFO");
#endif
trigger_transmit (ic->h);
- ic->callback (ic->callback_cls, NULL, NULL, 0);
+ if (ic->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (ic->timeout_task);
+ if (ic->callback != NULL)
+ ic->callback (ic->callback_cls, NULL, NULL);
GNUNET_free (ic);
return;
}
GNUNET_break (0);
reconnect (ic->h);
trigger_transmit (ic->h);
- ic->callback (ic->callback_cls, NULL, NULL, 2);
+ if (ic->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (ic->timeout_task);
+ if (ic->callback != NULL)
+ ic->callback (ic->callback_cls, NULL, NULL);
GNUNET_free (ic);
return;
}
im = (const struct InfoMessage *) msg;
+ GNUNET_break (0 == ntohl (im->reserved));
hello = NULL;
if (ms > sizeof (struct InfoMessage) + sizeof (struct GNUNET_MessageHeader))
{
GNUNET_break (0);
reconnect (ic->h);
trigger_transmit (ic->h);
- ic->callback (ic->callback_cls, NULL, NULL, 2);
+ if (ic->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (ic->timeout_task);
+ if (ic->callback != NULL)
+ ic->callback (ic->callback_cls, NULL, NULL);
GNUNET_free (ic);
return;
}
}
#if DEBUG_PEERINFO
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received %u bytes of `%s' information about peer `%s' from PEERINFO database\n",
+ "Received %u bytes of `%s' information about peer `%s' from `%s' service\n",
(hello == NULL) ? 0 : (unsigned int) GNUNET_HELLO_size (hello),
"HELLO",
- GNUNET_i2s (&im->peer));
+ GNUNET_i2s (&im->peer),
+ "PEERINFO");
#endif
- ic->callback (ic->callback_cls, &im->peer, hello, ntohl (im->trust));
+ ic->h->in_receive = GNUNET_YES;
+ if (ic->callback != NULL)
+ ic->callback (ic->callback_cls, &im->peer, hello);
GNUNET_CLIENT_receive (ic->h->client,
&peerinfo_handler,
ic,
/**
+ * We've transmitted the iteration request. Now get ready to process
+ * the results (or handle transmission error).
*
+ * @param cls the 'struct GNUNET_PEERINFO_IteratorContext'
+ * @param transmit_success GNUNET_OK if transmission worked
*/
static void
iterator_start_receive (void *cls,
int transmit_success)
{
- struct GNUNET_PEERINFO_NewIteratorContext *ic = cls;
+ struct GNUNET_PEERINFO_IteratorContext *ic = cls;
if (GNUNET_OK != transmit_success)
{
- ic->callback (ic->callback_cls, NULL, NULL, 2);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to transmit iteration request to `%s' service (%d).\n"),
+ "PEERINFO",
+ transmit_success);
+ if (ic->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (ic->timeout_task);
+ ic->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
reconnect (ic->h);
trigger_transmit (ic->h);
+ if (ic->callback != NULL)
+ ic->callback (ic->callback_cls, NULL, NULL);
GNUNET_free (ic);
return;
}
+#if DEBUG_PEERINFO
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Waiting for response from `%s' service.\n",
+ "PEERINFO");
+#endif
+ ic->h->in_receive = GNUNET_YES;
+ ic->in_receive = GNUNET_YES;
+ ic->tqe = NULL;
GNUNET_CLIENT_receive (ic->h->client,
&peerinfo_handler,
ic,
}
+/**
+ * Peerinfo iteration request has timed out.
+ *
+ * @param cls the 'struct GNUNET_PEERINFO_IteratorContext*'
+ * @param tc scheduler context
+ */
+static void
+signal_timeout (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_PEERINFO_IteratorContext *ic = cls;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
+ _("Timeout transmitting iteration request to `%s' service.\n"),
+ "PEERINFO");
+ ic->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ if (! ic->in_receive)
+ GNUNET_CONTAINER_DLL_remove (ic->h->tq_head,
+ ic->h->tq_tail,
+ ic->tqe);
+ reconnect (ic->h);
+ ic->callback (ic->callback_cls, NULL, NULL);
+ ic->callback = NULL;
+ GNUNET_free_non_null (ic->tqe);
+ GNUNET_free (ic);
+}
+
+
/**
* Call a method for each known matching host and change its trust
* value. The callback method will be invoked once for each matching
* host and then finally once with a NULL pointer. After that final
* invocation, the iterator context must no longer be used.
*
- * Note that the last call can be triggered by timeout or by simply
- * being done; however, the trust argument will be set to zero if we
- * are done, 1 if we timed out and 2 for fatal error.
- *
- * Instead of calling this function with 'peer == NULL' and 'trust ==
- * 0', it is often better to use 'GNUNET_PEERINFO_notify'.
+ * Instead of calling this function with 'peer == NULL' it is often
+ * better to use 'GNUNET_PEERINFO_notify'.
*
* @param h handle to the peerinfo service
* @param peer restrict iteration to this peer only (can be NULL)
- * @param trust_delta how much to change the trust in all matching peers
* @param timeout how long to wait until timing out
* @param callback the method to call for each peer
* @param callback_cls closure for callback
- * @return NULL on error (in this case, 'callback' is never called!),
- * otherwise an iterator context
+ * @return iterator context
*/
-struct GNUNET_PEERINFO_NewIteratorContext *
-GNUNET_PEERINFO_iterate_new (struct GNUNET_PEERINFO_Handle *h,
- const struct GNUNET_PeerIdentity *peer,
- int trust_delta,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_PEERINFO_Processor callback,
- void *callback_cls)
+struct GNUNET_PEERINFO_IteratorContext *
+GNUNET_PEERINFO_iterate (struct GNUNET_PEERINFO_Handle *h,
+ const struct GNUNET_PeerIdentity *peer,
+ struct GNUNET_TIME_Relative timeout,
+ GNUNET_PEERINFO_Processor callback,
+ void *callback_cls)
{
- struct ListAllPeersMessage *lapm;
+ struct GNUNET_MessageHeader *lapm;
struct ListPeerMessage *lpm;
- struct GNUNET_PEERINFO_NewIteratorContext *ic;
+ struct GNUNET_PEERINFO_IteratorContext *ic;
struct TransmissionQueueEntry *tqe;
-#if DEBUG_PEERINFO
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Requesting list of peers from peerinfo database\n");
-#endif
if (peer == NULL)
{
+#if DEBUG_PEERINFO
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Requesting list of peers from PEERINFO service\n");
+#endif
tqe = GNUNET_malloc (sizeof (struct TransmissionQueueEntry) +
- sizeof (struct ListAllPeersMessage));
- tqe->size = sizeof (struct ListAllPeersMessage);
- lapm = (struct ListAllPeersMessage *) &tqe[1];
- lapm->header.size = htons (sizeof (struct ListAllPeersMessage));
- lapm->header.type = htons (GNUNET_MESSAGE_TYPE_PEERINFO_GET_ALL);
- lapm->trust_change = htonl (trust_delta);
+ sizeof (struct GNUNET_MessageHeader));
+ tqe->size = sizeof (struct GNUNET_MessageHeader);
+ lapm = (struct GNUNET_MessageHeader *) &tqe[1];
+ lapm->size = htons (sizeof (struct GNUNET_MessageHeader));
+ lapm->type = htons (GNUNET_MESSAGE_TYPE_PEERINFO_GET_ALL);
}
else
{
+#if DEBUG_PEERINFO
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Requesting information on peer `%4s' from PEERINFO service\n",
+ GNUNET_i2s (peer));
+#endif
tqe = GNUNET_malloc (sizeof (struct TransmissionQueueEntry) +
sizeof (struct ListPeerMessage));
tqe->size = sizeof (struct ListPeerMessage);
lpm = (struct ListPeerMessage *) &tqe[1];
lpm->header.size = htons (sizeof (struct ListPeerMessage));
lpm->header.type = htons (GNUNET_MESSAGE_TYPE_PEERINFO_GET);
- lpm->trust_change = htonl (trust_delta);
memcpy (&lpm->peer, peer, sizeof (struct GNUNET_PeerIdentity));
}
- ic = GNUNET_malloc (sizeof (struct GNUNET_PEERINFO_NewIteratorContext));
+ ic = GNUNET_malloc (sizeof (struct GNUNET_PEERINFO_IteratorContext));
+ ic->h = h;
+ ic->tqe = tqe;
ic->callback = callback;
ic->callback_cls = callback_cls;
ic->timeout = GNUNET_TIME_relative_to_absolute (timeout);
+ ic->timeout_task = GNUNET_SCHEDULER_add_delayed (timeout,
+ &signal_timeout,
+ ic);
tqe->timeout = ic->timeout;
tqe->cont = &iterator_start_receive;
tqe->cont_cls = ic;
- /* FIXME: sort DLL by timeout? */
- /* FIXME: add timeout task!? */
+ tqe->timeout = ic->timeout;
GNUNET_CONTAINER_DLL_insert_after (h->tq_head,
h->tq_tail,
h->tq_tail,
* @param ic context of the iterator to cancel
*/
void
-GNUNET_PEERINFO_iterate_cancel_new (struct GNUNET_PEERINFO_NewIteratorContext *ic)
-{
- GNUNET_assert (0);
- // FIXME: not implemented
-}
-
-
-
-
-
-/* ***************************** OLD API ****************************** */
-
-
-
-
-#define ADD_PEER_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
-
-
-struct CAFContext
-{
- struct GNUNET_CLIENT_Connection *client;
- struct GNUNET_MessageHeader *msg;
-};
-
-
-static size_t
-copy_and_free (void *cls, size_t size, void *buf)
-{
- struct CAFContext *cc = cls;
- struct GNUNET_MessageHeader *msg = cc->msg;
- uint16_t msize;
-
- if (buf == NULL)
- {
-#if DEBUG_PEERINFO
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _
- ("Failed to transmit message of type %u to `%s' service.\n"),
- ntohs (msg->type), "peerinfo");
-#endif
- GNUNET_free (msg);
- GNUNET_CLIENT_disconnect (cc->client, GNUNET_NO);
- GNUNET_free (cc);
- return 0;
- }
- msize = ntohs (msg->size);
- GNUNET_assert (size >= msize);
- memcpy (buf, msg, msize);
- GNUNET_free (msg);
- GNUNET_CLIENT_disconnect (cc->client, GNUNET_YES);
- GNUNET_free (cc);
- return msize;
-}
-
-
-
-/**
- * Add a host to the persistent list.
- *
- * @param cfg configuration to use
- * @param sched scheduler to use
- * @param peer identity of the peer
- * @param hello the verified (!) HELLO message
- */
-void
-GNUNET_PEERINFO_add_peer (const struct GNUNET_CONFIGURATION_Handle *cfg,
- struct GNUNET_SCHEDULER_Handle *sched,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Message *hello)
-{
- struct GNUNET_CLIENT_Connection *client;
- struct PeerAddMessage *pam;
- uint16_t hs;
- struct CAFContext *cc;
-
-#if DEBUG_PEERINFO
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Adding peer `%s' to peerinfo database\n",
- GNUNET_i2s(peer));
-#endif
- client = GNUNET_CLIENT_connect (sched, "peerinfo", cfg);
- if (client == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Could not connect to `%s' service.\n"), "peerinfo");
- return;
- }
- hs = GNUNET_HELLO_size (hello);
-#if DEBUG_PEERINFO
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Size of `%s' is %u bytes\n",
- "HELLO",
- (unsigned int) GNUNET_HELLO_size (hello));
-#endif
- pam = GNUNET_malloc (sizeof (struct PeerAddMessage) + hs);
- pam->header.size = htons (hs + sizeof (struct PeerAddMessage));
- pam->header.type = htons (GNUNET_MESSAGE_TYPE_PEERINFO_ADD);
- memcpy (&pam->peer, peer, sizeof (struct GNUNET_PeerIdentity));
- memcpy (&pam[1], hello, hs);
- cc = GNUNET_malloc (sizeof (struct CAFContext));
- cc->client = client;
- cc->msg = &pam->header;
- GNUNET_CLIENT_notify_transmit_ready (client,
- ntohs (pam->header.size),
- ADD_PEER_TIMEOUT,
- GNUNET_NO,
- ©_and_free, cc);
-}
-
-
-/**
- * Context for the info handler.
- */
-struct GNUNET_PEERINFO_IteratorContext
-{
-
- /**
- * Our connection to the PEERINFO service.
- */
- struct GNUNET_CLIENT_Connection *client;
-
- /**
- * Function to call with information.
- */
- GNUNET_PEERINFO_Processor callback;
-
- /**
- * Closure for callback.
- */
- void *callback_cls;
-
- /**
- * When should we time out?
- */
- struct GNUNET_TIME_Absolute timeout;
-
-};
-
-
-/**
- * Type of a function to call when we receive a message
- * from the service.
- *
- * @param cls closure
- * @param msg message received, NULL on timeout or fatal error
- */
-static void
-info_handler (void *cls, const struct GNUNET_MessageHeader *msg)
-{
- struct GNUNET_PEERINFO_IteratorContext *ic = cls;
- const struct InfoMessage *im;
- const struct GNUNET_HELLO_Message *hello;
- uint16_t ms;
-
- if (msg == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to receive response from `%s' service.\n"),
- "peerinfo");
- ic->callback (ic->callback_cls, NULL, NULL, 1);
- GNUNET_CLIENT_disconnect (ic->client, GNUNET_NO);
- GNUNET_free (ic);
- return;
- }
- if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_PEERINFO_INFO_END)
- {
-#if DEBUG_PEERINFO
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received end of list of peers from peerinfo database\n");
-#endif
- ic->callback (ic->callback_cls, NULL, NULL, 0);
- GNUNET_CLIENT_disconnect (ic->client, GNUNET_NO);
- GNUNET_free (ic);
- return;
- }
- ms = ntohs (msg->size);
- if ((ms < sizeof (struct InfoMessage)) ||
- (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_PEERINFO_INFO))
- {
- GNUNET_break (0);
- ic->callback (ic->callback_cls, NULL, NULL, 2);
- GNUNET_CLIENT_disconnect (ic->client, GNUNET_NO);
- GNUNET_free (ic);
- return;
- }
- im = (const struct InfoMessage *) msg;
- hello = NULL;
- if (ms > sizeof (struct InfoMessage) + sizeof (struct GNUNET_MessageHeader))
- {
- hello = (const struct GNUNET_HELLO_Message *) &im[1];
- if (ms != sizeof (struct InfoMessage) + GNUNET_HELLO_size (hello))
- {
- GNUNET_break (0);
- ic->callback (ic->callback_cls, NULL, NULL, 2);
- GNUNET_CLIENT_disconnect (ic->client, GNUNET_NO);
- GNUNET_free (ic);
- return;
- }
- }
-#if DEBUG_PEERINFO
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received %u bytes of `%s' information about peer `%s' from PEERINFO database\n",
- (hello == NULL) ? 0 : (unsigned int) GNUNET_HELLO_size (hello),
- "HELLO",
- GNUNET_i2s (&im->peer));
-#endif
- ic->callback (ic->callback_cls, &im->peer, hello, ntohl (im->trust));
- GNUNET_CLIENT_receive (ic->client,
- &info_handler,
- ic,
- GNUNET_TIME_absolute_get_remaining (ic->timeout));
-}
-
-
-/**
- * Call a method for each known matching host and change
- * its trust value. The method will be invoked once for
- * each host and then finally once with a NULL pointer.
- * Note that the last call can be triggered by timeout or
- * by simply being done; however, the trust argument will
- * be set to zero if we are done and to 1 if we timed out.
- *
- * @param cfg configuration to use
- * @param sched scheduler to use
- * @param peer restrict iteration to this peer only (can be NULL)
- * @param trust_delta how much to change the trust in all matching peers
- * @param timeout how long to wait until timing out
- * @param callback the method to call for each peer
- * @param callback_cls closure for callback
- * @return NULL on error, otherwise an iterator context
- */
-struct GNUNET_PEERINFO_IteratorContext *
-GNUNET_PEERINFO_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
- struct GNUNET_SCHEDULER_Handle *sched,
- const struct GNUNET_PeerIdentity *peer,
- int trust_delta,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_PEERINFO_Processor callback,
- void *callback_cls)
+GNUNET_PEERINFO_iterate_cancel (struct GNUNET_PEERINFO_IteratorContext *ic)
{
- struct GNUNET_CLIENT_Connection *client;
- struct ListAllPeersMessage *lapm;
- struct ListPeerMessage *lpm;
- struct GNUNET_PEERINFO_IteratorContext *ihc;
-
- client = GNUNET_CLIENT_connect (sched, "peerinfo", cfg);
- if (client == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Could not connect to `%s' service.\n"), "peerinfo");
- return NULL;
- }
-#if DEBUG_PEERINFO
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Requesting list of peers from peerinfo database\n");
-#endif
- if (peer == NULL)
- {
- ihc = GNUNET_malloc (sizeof (struct GNUNET_PEERINFO_IteratorContext) +
- sizeof (struct ListAllPeersMessage));
- lapm = (struct ListAllPeersMessage *) &ihc[1];
- lapm->header.size = htons (sizeof (struct ListAllPeersMessage));
- lapm->header.type = htons (GNUNET_MESSAGE_TYPE_PEERINFO_GET_ALL);
- lapm->trust_change = htonl (trust_delta);
- }
- else
- {
- ihc = GNUNET_malloc (sizeof (struct GNUNET_PEERINFO_IteratorContext) +
- sizeof (struct ListPeerMessage));
- lpm = (struct ListPeerMessage *) &ihc[1];
- lpm->header.size = htons (sizeof (struct ListPeerMessage));
- lpm->header.type = htons (GNUNET_MESSAGE_TYPE_PEERINFO_GET);
- lpm->trust_change = htonl (trust_delta);
- memcpy (&lpm->peer, peer, sizeof (struct GNUNET_PeerIdentity));
- }
- ihc->client = client;
- ihc->callback = callback;
- ihc->callback_cls = callback_cls;
- ihc->timeout = GNUNET_TIME_relative_to_absolute (timeout);
- if (GNUNET_OK !=
- GNUNET_CLIENT_transmit_and_get_response (client,
- (const struct GNUNET_MessageHeader*) &ihc[1],
- timeout,
- GNUNET_YES,
- &info_handler,
- ihc))
+ if (ic->timeout_task != GNUNET_SCHEDULER_NO_TASK)
{
- GNUNET_break (0);
- GNUNET_CLIENT_disconnect (ihc->client, GNUNET_NO);
- GNUNET_free (ihc);
- return NULL;
+ GNUNET_SCHEDULER_cancel (ic->timeout_task);
+ ic->timeout_task = GNUNET_SCHEDULER_NO_TASK;
}
- return ihc;
-}
-
-
-/**
- * Cancel an iteration over peer information.
- *
- * @param ic context of the iterator to cancel
- */
-void
-GNUNET_PEERINFO_iterate_cancel (struct GNUNET_PEERINFO_IteratorContext *ic)
-{
- GNUNET_CLIENT_disconnect (ic->client, GNUNET_NO);
+ ic->callback = NULL;
+ if (ic->in_receive)
+ return; /* need to finish processing */
+ GNUNET_CONTAINER_DLL_remove (ic->h->tq_head,
+ ic->h->tq_tail,
+ ic->tqe);
+ GNUNET_free (ic->tqe);
GNUNET_free (ic);
}
projects / oweals / gnunet.git / blobdiff