X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Fpeerinfo%2Fpeerinfo_api.c;h=a0cb5c5c4a94323aba029ffcdb1d79393d0e6006;hb=320c2d50b722eeffc50cd6db0c5361886ee750b0;hp=aac83f71b7085acec073534e8acee2b05ed19082;hpb=cf3e70cea00a2d6d519fe563370ee9df16fdd913;p=oweals%2Fgnunet.git diff --git a/src/peerinfo/peerinfo_api.c b/src/peerinfo/peerinfo_api.c index aac83f71b..a0cb5c5c4 100644 --- a/src/peerinfo/peerinfo_api.c +++ b/src/peerinfo/peerinfo_api.c @@ -1,10 +1,10 @@ /* 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 @@ -22,11 +22,6 @@ * @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" @@ -37,44 +32,48 @@ #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; @@ -91,30 +90,32 @@ struct GNUNET_PEERINFO_Handle */ 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; + }; @@ -122,24 +123,21 @@ struct GNUNET_PEERINFO_Handle * 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; } @@ -167,32 +165,49 @@ GNUNET_PEERINFO_disconnect (struct GNUNET_PEERINFO_Handle *h) 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) @@ -204,26 +219,37 @@ 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) @@ -235,15 +261,23 @@ do_transmit (void *cls, size_t size, void *buf) } +/** + * 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), @@ -261,12 +295,11 @@ trigger_transmit (struct GNUNET_PEERINFO_Handle *h) * 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; @@ -292,33 +325,46 @@ GNUNET_PEERINFO_add_peer_new (struct GNUNET_PEERINFO_Handle *h, } - /** - * + * 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; +}; /** @@ -331,19 +377,23 @@ struct GNUNET_PEERINFO_NewIteratorContext 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; } @@ -351,10 +401,14 @@ peerinfo_handler (void *cls, const struct GNUNET_MessageHeader *msg) { #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; } @@ -365,11 +419,15 @@ peerinfo_handler (void *cls, const struct GNUNET_MessageHeader *msg) 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)) { @@ -379,19 +437,25 @@ peerinfo_handler (void *cls, const struct GNUNET_MessageHeader *msg) 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, @@ -400,22 +464,44 @@ peerinfo_handler (void *cls, const struct GNUNET_MessageHeader *msg) /** + * 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, @@ -423,75 +509,103 @@ iterator_start_receive (void *cls, } +/** + * 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, @@ -508,311 +622,20 @@ GNUNET_PEERINFO_iterate_new (struct GNUNET_PEERINFO_Handle *h, * @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); }