/*
This file is part of GNUnet.
- (C)
+ (C) 2013-2014 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
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
-
/**
* @file peerstore/peerstore_api.c
* @brief API for peerstore
* @author Omar Tarabai
+ * @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
*/
struct GNUNET_PEERSTORE_Handle *h;
- /**
- * MQ Envelope with store request message
- */
- struct GNUNET_MQ_Envelope *ev;
-
/**
* Continuation called with service response
*/
GNUNET_PEERSTORE_Continuation cont;
/**
- * Closure for 'cont'
+ * Closure for @e cont
*/
void *cont_cls;
+ /**
+ * Which subsystem does the store?
+ */
+ char *sub_system;
+
+ /**
+ * Key for the store operation.
+ */
+ char *key;
+
+ /**
+ * Contains @e size bytes.
+ */
+ void *value;
+
+ /**
+ * Peer the store is for.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Number of bytes in @e value.
+ */
+ size_t size;
+
+ /**
+ * When does the value expire?
+ */
+ struct GNUNET_TIME_Absolute expiry;
+
+ /**
+ * Options for the store operation.
+ */
+ enum GNUNET_PEERSTORE_StoreOption options;
+
};
/**
struct GNUNET_PEERSTORE_Handle *h;
/**
- * MQ Envelope with iterate request message
+ * Which subsystem does the store?
*/
- struct GNUNET_MQ_Envelope *ev;
+ char *sub_system;
+
+ /**
+ * Peer the store is for.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Key for the store operation.
+ */
+ char *key;
+
+ /**
+ * Operation timeout
+ */
+ struct GNUNET_TIME_Relative timeout;
/**
* Callback with each matching record
GNUNET_PEERSTORE_Processor callback;
/**
- * Closure for 'callback'
+ * Closure for @e callback
*/
void *callback_cls;
/**
- * #GNUNET_YES / #GNUNET_NO
- * Iterate request has been sent and we are still expecting records
+ * #GNUNET_YES if we are currently processing records.
*/
int iterating;
*/
struct GNUNET_PEERSTORE_Handle *h;
- /**
- * MQ Envelope with watch request message
- */
- struct GNUNET_MQ_Envelope *ev;
-
/**
* Callback with each record received
*/
GNUNET_PEERSTORE_Processor callback;
/**
- * Closure for 'callback'
+ * Closure for @e callback
*/
void *callback_cls;
*/
struct GNUNET_HashCode keyhash;
- /**
- * #GNUNET_YES / #GNUNET_NO
- * if sent, cannot be canceled
- */
- int request_sent;
-
};
/******************************************************************************/
static void
reconnect (struct GNUNET_PEERSTORE_Handle *h);
-/**
- * Callback after MQ envelope is sent
- *
- * @param cls a 'struct GNUNET_PEERSTORE_WatchContext *'
- */
-static void
-watch_request_sent (void *cls);
/**
* Callback after MQ envelope is sent
*
- * @param cls a 'struct GNUNET_PEERSTORE_IterateContext *'
+ * @param cls a `struct GNUNET_PEERSTORE_StoreContext *`
*/
static void
-iterate_request_sent (void *cls);
+store_request_sent (void *cls)
+{
+ struct GNUNET_PEERSTORE_StoreContext *sc = cls;
+ GNUNET_PEERSTORE_Continuation cont;
+ void *cont_cls;
+
+ cont = sc->cont;
+ cont_cls = sc->cont_cls;
+ GNUNET_PEERSTORE_store_cancel (sc);
+ if (NULL != cont)
+ cont (cont_cls, GNUNET_OK);
+}
-/**
- * Callback after MQ envelope is sent
- *
- * @param cls a 'struct GNUNET_PEERSTORE_StoreContext *'
- */
-static void
-store_request_sent (void *cls);
/**
* MQ message handlers
/**
* Iterator over previous watches to resend them
+ *
+ * @param cls the `struct GNUNET_PEERSTORE_Handle`
+ * @param key key for the watch
+ * @param value the `struct GNUNET_PEERSTORE_WatchContext *`
+ * @return #GNUNET_YES (continue to iterate)
*/
static int
rewatch_it (void *cls, const struct GNUNET_HashCode *key, void *value)
struct GNUNET_PEERSTORE_Handle *h = cls;
struct GNUNET_PEERSTORE_WatchContext *wc = value;
struct StoreKeyHashMessage *hm;
+ struct GNUNET_MQ_Envelope *ev;
- if (GNUNET_YES == wc->request_sent)
- { /* Envelope gone, create new one. */
- wc->ev = GNUNET_MQ_msg (hm, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH);
- hm->keyhash = wc->keyhash;
- wc->request_sent = GNUNET_NO;
- }
- GNUNET_MQ_notify_sent (wc->ev, &watch_request_sent, wc);
- GNUNET_MQ_send (h->mq, wc->ev);
+ ev = GNUNET_MQ_msg (hm, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH);
+ hm->keyhash = wc->keyhash;
+ GNUNET_MQ_send (h->mq, ev);
return GNUNET_YES;
}
+/**
+ * Called when the iterate request is timedout
+ *
+ * @param cls a `struct GNUNET_PEERSTORE_IterateContext *`
+ * @param tc Scheduler task context (unused)
+ */
+static void
+iterate_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_PEERSTORE_IterateContext *ic = cls;
+ GNUNET_PEERSTORE_Processor callback;
+ void *callback_cls;
+
+ ic->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ callback = ic->callback;
+ callback_cls = ic->callback_cls;
+ GNUNET_PEERSTORE_iterate_cancel (ic);
+ if (NULL != callback)
+ callback (callback_cls, NULL, _("timeout"));
+}
+
+
/**
* Close the existing connection to PEERSTORE and reconnect.
*
reconnect (struct GNUNET_PEERSTORE_Handle *h)
{
struct GNUNET_PEERSTORE_IterateContext *ic;
+ struct GNUNET_PEERSTORE_IterateContext *next;
GNUNET_PEERSTORE_Processor icb;
void *icb_cls;
struct GNUNET_PEERSTORE_StoreContext *sc;
+ struct GNUNET_MQ_Envelope *ev;
LOG (GNUNET_ERROR_TYPE_DEBUG, "Reconnecting...\n");
+ for (ic = h->iterate_head; NULL != ic; ic = next)
+ {
+ next = ic->next;
+ icb = ic->callback;
+ icb_cls = ic->callback_cls;
+ GNUNET_PEERSTORE_iterate_cancel (ic);
+ if (NULL != icb)
+ icb (icb_cls, NULL, _("Iteration canceled due to reconnection."));
+ }
if (NULL != h->mq)
{
GNUNET_MQ_destroy (h->mq);
GNUNET_CLIENT_disconnect (h->client);
h->client = NULL;
}
+
h->client = GNUNET_CLIENT_connect ("peerstore", h->cfg);
GNUNET_assert (NULL != h->client);
h->mq =
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Resending pending requests after reconnect.\n");
if (NULL != h->watches)
- {
GNUNET_CONTAINER_multihashmap_iterate (h->watches, &rewatch_it, h);
- }
- ic = h->iterate_head;
- while (NULL != ic)
+ for (ic = h->iterate_head; NULL != ic; ic = ic->next)
{
- if (GNUNET_YES == ic->iterating)
- {
- icb = ic->callback;
- icb_cls = ic->callback_cls;
- GNUNET_PEERSTORE_iterate_cancel (ic);
- if (NULL != icb)
- icb (icb_cls, NULL, _("Iteration canceled due to reconnection."));
- }
- else
- {
- GNUNET_MQ_notify_sent (ic->ev, &iterate_request_sent, ic);
- GNUNET_MQ_send (h->mq, ic->ev);
- }
- ic = ic->next;
+ ev =
+ PEERSTORE_create_record_mq_envelope (ic->sub_system, &ic->peer, ic->key,
+ NULL, 0, NULL, 0,
+ GNUNET_MESSAGE_TYPE_PEERSTORE_ITERATE);
+ GNUNET_MQ_send (h->mq, ev);
+ ic->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (ic->timeout, &iterate_timeout, ic);
}
- sc = h->store_head;
- while (NULL != sc)
+ for (sc = h->store_head; NULL != sc; sc = sc->next)
{
- GNUNET_MQ_notify_sent (sc->ev, &store_request_sent, sc);
- GNUNET_MQ_send (h->mq, sc->ev);
- sc = sc->next;
+ ev =
+ PEERSTORE_create_record_mq_envelope (sc->sub_system, &sc->peer, sc->key,
+ sc->value, sc->size, &sc->expiry,
+ sc->options,
+ GNUNET_MESSAGE_TYPE_PEERSTORE_STORE);
+ GNUNET_MQ_notify_sent (ev, &store_request_sent, sc);
+ GNUNET_MQ_send (h->mq, ev);
}
}
/**
* Connect to the PEERSTORE service.
*
+ * @param cfg configuration to use
* @return NULL on error
*/
struct GNUNET_PEERSTORE_Handle *
&handle_client_error, h);
if (NULL == h->mq)
{
+ GNUNET_CLIENT_disconnect (h->client);
GNUNET_free (h);
return NULL;
}
ic_iter = h->iterate_head;
while (NULL != ic_iter)
{
+ GNUNET_break (0);
ic = ic_iter;
ic_iter = ic_iter->next;
GNUNET_PEERSTORE_iterate_cancel (ic);
/******************* STORE FUNCTIONS *********************/
/******************************************************************************/
-/**
- * Callback after MQ envelope is sent
- *
- * @param cls a 'struct GNUNET_PEERSTORE_StoreContext *'
- */
-static void
-store_request_sent (void *cls)
-{
- struct GNUNET_PEERSTORE_StoreContext *sc = cls;
- GNUNET_PEERSTORE_Continuation cont;
- void *cont_cls;
-
- sc->ev = NULL;
- cont = sc->cont;
- cont_cls = sc->cont_cls;
- GNUNET_PEERSTORE_store_cancel (sc);
- if (NULL != cont)
- cont (cont_cls, GNUNET_OK);
-}
-
/**
* Cancel a store request
{
struct GNUNET_PEERSTORE_Handle *h = sc->h;
- if (NULL != sc->ev)
- {
- GNUNET_MQ_send_cancel (sc->ev);
- sc->ev = NULL;
- }
GNUNET_CONTAINER_DLL_remove (sc->h->store_head, sc->h->store_tail, sc);
+ GNUNET_free (sc->sub_system);
+ GNUNET_free (sc->value);
+ GNUNET_free (sc->key);
GNUNET_free (sc);
- if (GNUNET_YES == h->disconnecting && NULL == h->store_head)
+ if ((GNUNET_YES == h->disconnecting) && (NULL == h->store_head))
do_disconnect (h);
}
* @param expiry absolute time after which the entry is (possibly) deleted
* @param options options specific to the storage operation
* @param cont Continuation function after the store request is sent
- * @param cont_cls Closure for 'cont'
+ * @param cont_cls Closure for @a cont
*/
struct GNUNET_PEERSTORE_StoreContext *
GNUNET_PEERSTORE_store (struct GNUNET_PEERSTORE_Handle *h,
GNUNET_MESSAGE_TYPE_PEERSTORE_STORE);
sc = GNUNET_new (struct GNUNET_PEERSTORE_StoreContext);
- sc->ev = ev;
+ sc->sub_system = GNUNET_strdup (sub_system);
+ sc->peer = *peer;
+ sc->key = GNUNET_strdup (key);
+ sc->value = GNUNET_memdup (value, size);
+ sc->size = size;
+ sc->expiry = expiry;
+ sc->options = options;
sc->cont = cont;
sc->cont_cls = cont_cls;
sc->h = h;
+
GNUNET_CONTAINER_DLL_insert_tail (h->store_head, h->store_tail, sc);
GNUNET_MQ_notify_sent (ev, &store_request_sent, sc);
GNUNET_MQ_send (h->mq, ev);
/**
* When a response for iterate request is received
*
- * @param cls a 'struct GNUNET_PEERSTORE_Handle *'
+ * @param cls a `struct GNUNET_PEERSTORE_Handle *`
* @param msg message received, NULL on timeout or fatal error
*/
static void
reconnect (h);
return;
}
+ ic->iterating = GNUNET_YES;
callback = ic->callback;
callback_cls = ic->callback_cls;
if (NULL == msg) /* Connection error */
{
-
if (NULL != callback)
callback (callback_cls, NULL,
_("Error communicating with `PEERSTORE' service."));
}
-/**
- * Callback after MQ envelope is sent
- *
- * @param cls a 'struct GNUNET_PEERSTORE_IterateContext *'
- */
-static void
-iterate_request_sent (void *cls)
-{
- struct GNUNET_PEERSTORE_IterateContext *ic = cls;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Iterate request sent to service.\n");
- ic->iterating = GNUNET_YES;
- ic->ev = NULL;
-}
-
-
-/**
- * Called when the iterate request is timedout
- *
- * @param cls a 'struct GNUNET_PEERSTORE_IterateContext *'
- * @param tc Scheduler task context (unused)
- */
-static void
-iterate_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct GNUNET_PEERSTORE_IterateContext *ic = cls;
-
- ic->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- GNUNET_PEERSTORE_iterate_cancel (ic);
-}
-
-
/**
* Cancel an iterate request
* Please do not call after the iterate request is done
}
if (GNUNET_NO == ic->iterating)
{
- if (NULL != ic->ev)
- {
- GNUNET_MQ_send_cancel (ic->ev);
- ic->ev = NULL;
- }
GNUNET_CONTAINER_DLL_remove (ic->h->iterate_head, ic->h->iterate_tail, ic);
+ GNUNET_free (ic->sub_system);
+ if (NULL != ic->key)
+ GNUNET_free (ic->key);
GNUNET_free (ic);
}
else
ic->callback = callback;
ic->callback_cls = callback_cls;
- ic->ev = ev;
ic->h = h;
- ic->iterating = GNUNET_NO;
- GNUNET_CONTAINER_DLL_insert_tail (h->iterate_head, h->iterate_tail, ic);
+ ic->sub_system = GNUNET_strdup (sub_system);
+ if (NULL != peer)
+ ic->peer = *peer;
+ if (NULL != key)
+ ic->key = GNUNET_strdup (key);
+ ic->timeout = timeout;
+ GNUNET_CONTAINER_DLL_insert_tail (h->iterate_head,
+ h->iterate_tail,
+ ic);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Sending an iterate request for sub system `%s'\n", sub_system);
- GNUNET_MQ_notify_sent (ev, &iterate_request_sent, ic);
GNUNET_MQ_send (h->mq, ev);
ic->timeout_task =
GNUNET_SCHEDULER_add_delayed (timeout, &iterate_timeout, ic);
if (NULL == msg)
{
LOG (GNUNET_ERROR_TYPE_ERROR,
- _("Problem receiving a watch response, no way to determine which request.\n"));
+ _
+ ("Problem receiving a watch response, no way to determine which request.\n"));
reconnect (h);
return;
}
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received a watch record from service.\n");
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a watch record from service.\n");
record = PEERSTORE_parse_record_message (msg);
PEERSTORE_hash_key (record->sub_system, record->peer, record->key, &keyhash);
+ // FIXME: what if there are multiple watches for the same key?
wc = GNUNET_CONTAINER_multihashmap_get (h->watches, &keyhash);
if (NULL == wc)
{
}
-/**
- * Callback after MQ envelope is sent
- *
- * @param cls a `struct GNUNET_PEERSTORE_WatchContext *`
- */
-static void
-watch_request_sent (void *cls)
-{
- struct GNUNET_PEERSTORE_WatchContext *wc = cls;
-
- wc->request_sent = GNUNET_YES;
- wc->ev = NULL;
-}
-
-
/**
* Cancel a watch request
*
struct GNUNET_MQ_Envelope *ev;
struct StoreKeyHashMessage *hm;
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Canceling watch.\n");
- if (GNUNET_YES == wc->request_sent) /* If request already sent to service, send a cancel request. */
- {
- ev = GNUNET_MQ_msg (hm, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH_CANCEL);
- hm->keyhash = wc->keyhash;
- GNUNET_MQ_send (h->mq, ev);
- wc->callback = NULL;
- wc->callback_cls = NULL;
- }
- if (NULL != wc->ev)
- {
- GNUNET_MQ_send_cancel (wc->ev);
- wc->ev = NULL;
- }
- GNUNET_CONTAINER_multihashmap_remove (h->watches, &wc->keyhash, wc);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Canceling watch.\n");
+ ev = GNUNET_MQ_msg (hm, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH_CANCEL);
+ hm->keyhash = wc->keyhash;
+ GNUNET_MQ_send (h->mq, ev);
+ GNUNET_CONTAINER_multihashmap_remove (h->watches,
+ &wc->keyhash,
+ wc);
GNUNET_free (wc);
-
}
GNUNET_assert (NULL != peer);
GNUNET_assert (NULL != key);
ev = GNUNET_MQ_msg (hm, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH);
- PEERSTORE_hash_key (sub_system, peer, key, &hm->keyhash);
+ PEERSTORE_hash_key (sub_system,
+ peer,
+ key,
+ &hm->keyhash);
wc = GNUNET_new (struct GNUNET_PEERSTORE_WatchContext);
-
wc->callback = callback;
wc->callback_cls = callback_cls;
- wc->ev = ev;
wc->h = h;
- wc->request_sent = GNUNET_NO;
wc->keyhash = hm->keyhash;
if (NULL == h->watches)
h->watches = GNUNET_CONTAINER_multihashmap_create (5, GNUNET_NO);
- GNUNET_CONTAINER_multihashmap_put (h->watches, &wc->keyhash, wc,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (h->watches,
+ &wc->keyhash,
+ wc,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Sending a watch request for ss `%s', peer `%s', key `%s'.\n",
- sub_system, GNUNET_i2s (peer), key);
- GNUNET_MQ_notify_sent (ev, &watch_request_sent, wc);
+ sub_system,
+ GNUNET_i2s (peer),
+ key);
GNUNET_MQ_send (h->mq, ev);
return wc;
}
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