* @file datastore/gnunet-service-datastore.c
* @brief Management for the datastore for files stored on a GNUnet node
* @author Christian Grothoff
- *
- * TODO:
- * 1) transmit and transmit flow-control (when do we signal client 'success'?
- * ALSO: async transmit will need to address ref-counting issues on client!
- * 2) efficient "update" for client to raise priority / expiration
- * (not possible with current datastore API, but plugin API has support!);
- * [ maybe integrate desired priority/expiration updates directly
- * with 'GET' request? ]
- * 3) semantics of "PUT" (plugin) if entry exists (should likely
- * be similar to "UPDATE" (need to specify in PLUGIN API!)
- * 4) quota management code!
- * 5) add bloomfilter for efficiency!
*/
#include "platform.h"
#include "gnunet_util_lib.h"
+#include "gnunet_arm_service.h"
#include "gnunet_protocols.h"
#include "plugin_datastore.h"
#include "datastore.h"
+/**
+ * How many messages do we queue at most per client?
+ */
+#define MAX_PENDING 1024
+
+/**
+ * How long are we at most keeping "expired" content
+ * past the expiration date in the database?
+ */
+#define MAX_EXPIRE_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
+
+
/**
* Our datastore plugin.
};
+/**
+ * Linked list of active reservations.
+ */
+struct ReservationList
+{
+
+ /**
+ * This is a linked list.
+ */
+ struct ReservationList *next;
+
+ /**
+ * Client that made the reservation.
+ */
+ struct GNUNET_SERVER_Client *client;
+
+ /**
+ * Number of bytes (still) reserved.
+ */
+ uint64_t amount;
+
+ /**
+ * Number of items (still) reserved.
+ */
+ uint64_t entries;
+
+ /**
+ * Reservation identifier.
+ */
+ int32_t rid;
+
+};
+
+
/**
* Our datastore plugin (NULL if not available).
*/
static struct DatastorePlugin *plugin;
+/**
+ * Linked list of space reservations made by clients.
+ */
+static struct ReservationList *reservations;
+
+/**
+ * Bloomfilter to quickly tell if we don't have the content.
+ */
+static struct GNUNET_CONTAINER_BloomFilter *filter;
+
+/**
+ * Static counter to produce reservation identifiers.
+ */
+static int reservation_gen;
+
+/**
+ * How much space are we allowed to use?
+ */
+static unsigned long long quota;
+
+/**
+ * How much space are we using for the cache? (space available for
+ * insertions that will be instantly reclaimed by discarding less
+ * important content --- or possibly whatever we just inserted into
+ * the "cache").
+ */
+static unsigned long long cache_size;
+
+/**
+ * How much space have we currently reserved?
+ */
+static unsigned long long reserved;
+
+/**
+ * Identity of the task that is used to delete
+ * expired content.
+ */
+static GNUNET_SCHEDULER_TaskIdentifier expired_kill_task;
+
+/**
+ * Our configuration.
+ */
+const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+/**
+ * Our scheduler.
+ */
+struct GNUNET_SCHEDULER_Handle *sched;
+
+/**
+ * Function called once the transmit operation has
+ * either failed or succeeded.
+ *
+ * @param cls closure
+ * @param status GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+typedef void (*TransmitContinuation)(void *cls,
+ int status);
+
+
+/**
+ * Context for transmitting replies to clients.
+ */
+struct TransmitCallbackContext
+{
+
+ /**
+ * We keep these in a doubly-linked list (for cleanup).
+ */
+ struct TransmitCallbackContext *next;
+
+ /**
+ * We keep these in a doubly-linked list (for cleanup).
+ */
+ struct TransmitCallbackContext *prev;
+
+ /**
+ * The message that we're asked to transmit.
+ */
+ struct GNUNET_MessageHeader *msg;
+
+ /**
+ * Handle for the transmission request.
+ */
+ struct GNUNET_CONNECTION_TransmitHandle *th;
+
+ /**
+ * Client that we are transmitting to.
+ */
+ struct GNUNET_SERVER_Client *client;
+
+ /**
+ * Function to call once msg has been transmitted
+ * (or at least added to the buffer).
+ */
+ TransmitContinuation tc;
+
+ /**
+ * Closure for tc.
+ */
+ void *tc_cls;
+
+ /**
+ * GNUNET_YES if we are supposed to signal the server
+ * completion of the client's request.
+ */
+ int end;
+};
+
+
+/**
+ * Head of the doubly-linked list (for cleanup).
+ */
+static struct TransmitCallbackContext *tcc_head;
+
+/**
+ * Tail of the doubly-linked list (for cleanup).
+ */
+static struct TransmitCallbackContext *tcc_tail;
+
+
+/**
+ * Task that is used to remove expired entries from
+ * the datastore. This task will schedule itself
+ * again automatically to always delete all expired
+ * content quickly.
+ *
+ * @param cls not used
+ * @param tc task context
+ */
+static void
+delete_expired (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
+/**
+ * Iterate over the expired items stored in the datastore.
+ * Delete all expired items; once we have processed all
+ * expired items, re-schedule the "delete_expired" task.
+ *
+ * @param cls not used
+ * @param next_cls closure to pass to the "next" function.
+ * @param key key for the content
+ * @param size number of bytes in data
+ * @param data content stored
+ * @param type type of the content
+ * @param priority priority of the content
+ * @param anonymity anonymity-level for the content
+ * @param expiration expiration time for the content
+ * @param uid unique identifier for the datum;
+ * maybe 0 if no unique identifier is available
+ *
+ * @return GNUNET_SYSERR to abort the iteration, GNUNET_OK to continue
+ * (continue on call to "next", of course),
+ * GNUNET_NO to delete the item and continue (if supported)
+ */
+static int
+expired_processor (void *cls,
+ void *next_cls,
+ const GNUNET_HashCode * key,
+ uint32_t size,
+ const void *data,
+ uint32_t type,
+ uint32_t priority,
+ uint32_t anonymity,
+ struct GNUNET_TIME_Absolute
+ expiration,
+ uint64_t uid)
+{
+ struct GNUNET_TIME_Absolute now;
+
+ expired_kill_task = GNUNET_SCHEDULER_NO_TASK;
+ if (key == NULL)
+ {
+ expired_kill_task
+ = GNUNET_SCHEDULER_add_delayed (sched,
+ MAX_EXPIRE_DELAY,
+ &delete_expired,
+ NULL);
+ return GNUNET_SYSERR;
+ }
+ now = GNUNET_TIME_absolute_get ();
+ if (expiration.value > now.value)
+ {
+ /* finished processing */
+ plugin->api->next_request (next_cls, GNUNET_YES);
+ return GNUNET_SYSERR;
+ }
+ plugin->api->next_request (next_cls, GNUNET_NO);
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Deleting content that expired %llu ms ago\n",
+ (unsigned long long) (now.value - expiration.value));
+#endif
+ GNUNET_CONTAINER_bloomfilter_remove (filter,
+ key);
+ return GNUNET_NO; /* delete */
+}
+
+
+/**
+ * Task that is used to remove expired entries from
+ * the datastore. This task will schedule itself
+ * again automatically to always delete all expired
+ * content quickly.
+ *
+ * @param cls not used
+ * @param tc task context
+ */
+static void
+delete_expired (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ plugin->api->iter_ascending_expiration (plugin->api->cls,
+ 0,
+ &expired_processor,
+ NULL);
+}
+
+
+/**
+ * An iterator over a set of items stored in the datastore.
+ *
+ * @param cls closure
+ * @param next_cls closure to pass to the "next" function.
+ * @param key key for the content
+ * @param size number of bytes in data
+ * @param data content stored
+ * @param type type of the content
+ * @param priority priority of the content
+ * @param anonymity anonymity-level for the content
+ * @param expiration expiration time for the content
+ * @param uid unique identifier for the datum;
+ * maybe 0 if no unique identifier is available
+ *
+ * @return GNUNET_SYSERR to abort the iteration, GNUNET_OK to continue
+ * (continue on call to "next", of course),
+ * GNUNET_NO to delete the item and continue (if supported)
+ */
+static int
+manage (void *cls,
+ void *next_cls,
+ const GNUNET_HashCode * key,
+ uint32_t size,
+ const void *data,
+ uint32_t type,
+ uint32_t priority,
+ uint32_t anonymity,
+ struct GNUNET_TIME_Absolute
+ expiration,
+ uint64_t uid)
+{
+ unsigned long long *need = cls;
+
+ if (NULL == key)
+ {
+ GNUNET_free (need);
+ return GNUNET_SYSERR;
+ }
+ if (size + GNUNET_DATASTORE_ENTRY_OVERHEAD > *need)
+ *need = 0;
+ else
+ *need -= size + GNUNET_DATASTORE_ENTRY_OVERHEAD;
+ plugin->api->next_request (next_cls,
+ (0 == *need) ? GNUNET_YES : GNUNET_NO);
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Deleting %llu bytes of low-priority content (still trying to free another %llu bytes)\n",
+ size + GNUNET_DATASTORE_ENTRY_OVERHEAD,
+ *need);
+#endif
+ GNUNET_CONTAINER_bloomfilter_remove (filter,
+ key);
+ return GNUNET_NO;
+}
+
+
+/**
+ * Manage available disk space by running tasks
+ * that will discard content if necessary. This
+ * function will be run whenever a request for
+ * "need" bytes of storage could only be satisfied
+ * by eating into the "cache" (and we want our cache
+ * space back).
+ *
+ * @param need number of bytes of content that were
+ * placed into the "cache" (and hence the
+ * number of bytes that should be removed).
+ */
+static void
+manage_space (unsigned long long need)
+{
+ unsigned long long *n;
+
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asked to free up %llu bytes of cache space\n",
+ need);
+#endif
+ n = GNUNET_malloc (sizeof(unsigned long long));
+ *n = need;
+ plugin->api->iter_low_priority (plugin->api->cls,
+ 0,
+ &manage,
+ n);
+}
+
+
+/**
+ * Function called to notify a client about the socket
+ * begin ready to queue more data. "buf" will be
+ * NULL and "size" zero if the socket was closed for
+ * writing in the meantime.
+ *
+ * @param cls closure
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
+ */
+static size_t
+transmit_callback (void *cls,
+ size_t size, void *buf)
+{
+ struct TransmitCallbackContext *tcc = cls;
+ size_t msize;
+
+ tcc->th = NULL;
+ GNUNET_CONTAINER_DLL_remove (tcc_head,
+ tcc_tail,
+ tcc);
+ msize = ntohs(tcc->msg->size);
+ if (size == 0)
+ {
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Transmission failed.\n");
+#endif
+ if (tcc->tc != NULL)
+ tcc->tc (tcc->tc_cls, GNUNET_SYSERR);
+ if (GNUNET_YES == tcc->end)
+ GNUNET_SERVER_receive_done (tcc->client, GNUNET_SYSERR);
+ GNUNET_SERVER_client_drop (tcc->client);
+ GNUNET_free (tcc->msg);
+ GNUNET_free (tcc);
+ return 0;
+ }
+ GNUNET_assert (size >= msize);
+ memcpy (buf, tcc->msg, msize);
+ if (tcc->tc != NULL)
+ tcc->tc (tcc->tc_cls, GNUNET_OK);
+ if (GNUNET_YES == tcc->end)
+ {
+ GNUNET_SERVER_receive_done (tcc->client, GNUNET_OK);
+ }
+ else
+ {
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Response transmitted, more pending!\n");
+#endif
+ }
+ GNUNET_SERVER_client_drop (tcc->client);
+ GNUNET_free (tcc->msg);
+ GNUNET_free (tcc);
+ return msize;
+}
+
/**
* Transmit the given message to the client.
+ *
+ * @param client target of the message
+ * @param msg message to transmit, will be freed!
+ * @param tc function to call afterwards
+ * @param tc_cls closure for tc
+ * @param end is this the last response (and we should
+ * signal the server completion accodingly after
+ * transmitting this message)?
*/
static void
transmit (struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *msg)
+ struct GNUNET_MessageHeader *msg,
+ TransmitContinuation tc,
+ void *tc_cls,
+ int end)
{
- /* FIXME! */
+ struct TransmitCallbackContext *tcc;
+
+ tcc = GNUNET_malloc (sizeof(struct TransmitCallbackContext));
+ tcc->msg = msg;
+ tcc->client = client;
+ tcc->tc = tc;
+ tcc->tc_cls = tc_cls;
+ tcc->end = end;
+ if (NULL ==
+ (tcc->th = GNUNET_SERVER_notify_transmit_ready (client,
+ ntohs(msg->size),
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &transmit_callback,
+ tcc)))
+ {
+ GNUNET_break (0);
+ if (GNUNET_YES == end)
+ {
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Disconnecting client.\n");
+#endif
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ }
+ if (NULL != tc)
+ tc (tc_cls, GNUNET_SYSERR);
+ GNUNET_free (msg);
+ GNUNET_free (tcc);
+ return;
+ }
+ GNUNET_SERVER_client_keep (client);
+ GNUNET_CONTAINER_DLL_insert (tcc_head,
+ tcc_tail,
+ tcc);
}
/**
- * Transmit the size of the current datastore to the client.
+ * Transmit a status code to the client.
+ *
+ * @param client receiver of the response
+ * @param code status code
+ * @param msg optional error message (can be NULL)
*/
static void
-transmit_size (struct GNUNET_SERVER_Client *client)
+transmit_status (struct GNUNET_SERVER_Client *client,
+ int code,
+ const char *msg)
{
- struct SizeMessage sm;
-
- sm.header.size = htons(sizeof(struct SizeMessage));
- sm.header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_SIZE);
- sm.reserved = htonl(0);
- sm.size = GNUNET_htonll(plugin->api->get_size (plugin->api->cls));
- transmit (client, &sm.header);
+ struct StatusMessage *sm;
+ size_t slen;
+
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting `%s' message with value %d and message `%s'\n",
+ "STATUS",
+ code,
+ msg != NULL ? msg : "(none)");
+#endif
+ slen = (msg == NULL) ? 0 : strlen(msg) + 1;
+ sm = GNUNET_malloc (sizeof(struct StatusMessage) + slen);
+ sm->header.size = htons(sizeof(struct StatusMessage) + slen);
+ sm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_STATUS);
+ sm->status = htonl(code);
+ if (slen > 0)
+ memcpy (&sm[1], msg, slen);
+ transmit (client, &sm->header, NULL, NULL, GNUNET_YES);
+}
+
+
+/**
+ * Function called once the transmit operation has
+ * either failed or succeeded.
+ *
+ * @param next_cls closure for calling "next_request" callback
+ * @param status GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+static void
+get_next(void *next_cls,
+ int status)
+{
+ if (status != GNUNET_OK)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("Failed to transmit an item to the client; aborting iteration.\n"));
+ if (plugin != NULL)
+ plugin->api->next_request (next_cls, GNUNET_YES);
+ return;
+ }
+ plugin->api->next_request (next_cls, GNUNET_NO);
}
* to the client.
*
* @param cls closure, pointer to the client (of type GNUNET_SERVER_Client).
+ * @param next_cls closure to use to ask for the next item
* @param key key for the content
* @param size number of bytes in data
* @param data content stored
*/
static int
transmit_item (void *cls,
+ void *next_cls,
const GNUNET_HashCode * key,
uint32_t size,
const void *data,
uint32_t priority,
uint32_t anonymity,
struct GNUNET_TIME_Absolute
- expiration, unsigned long long uid)
+ expiration, uint64_t uid)
{
struct GNUNET_SERVER_Client *client = cls;
- struct GNUNET_MessageHeader end;
+ struct GNUNET_MessageHeader *end;
struct DataMessage *dm;
if (key == NULL)
{
/* transmit 'DATA_END' */
- end.size = htons(sizeof(struct GNUNET_MessageHeader));
- end.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_DATA_END);
- transmit (client, &end);
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting `%s' message\n",
+ "DATA_END");
+#endif
+ end = GNUNET_malloc (sizeof(struct GNUNET_MessageHeader));
+ end->size = htons(sizeof(struct GNUNET_MessageHeader));
+ end->type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_DATA_END);
+ transmit (client, end, NULL, NULL, GNUNET_YES);
+ GNUNET_SERVER_client_drop (client);
return GNUNET_OK;
}
- /* FIXME: make use of 'uid' for efficient priority/expiration update! */
dm = GNUNET_malloc (sizeof(struct DataMessage) + size);
dm->header.size = htons(sizeof(struct DataMessage) + size);
dm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_DATA);
- dm->reserved = htonl(0);
+ dm->rid = htonl(0);
dm->size = htonl(size);
dm->type = htonl(type);
dm->priority = htonl(priority);
dm->anonymity = htonl(anonymity);
dm->expiration = GNUNET_TIME_absolute_hton(expiration);
+ dm->uid = GNUNET_htonll(uid);
dm->key = *key;
memcpy (&dm[1], data, size);
- transmit (client, &dm->header);
- GNUNET_free (dm);
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting `%s' message\n",
+ "DATA");
+#endif
+ transmit (client, &dm->header, &get_next, next_cls, GNUNET_NO);
return GNUNET_OK;
}
/**
- * Handle INIT-message.
+ * Handle RESERVE-message.
*
* @param cls closure
* @param client identification of the client
* @param message the actual message
*/
static void
-handle_init (void *cls,
- struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+handle_reserve (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct ReserveMessage *msg = (const struct ReserveMessage*) message;
+ struct ReservationList *e;
+ unsigned long long used;
+ unsigned long long req;
+ uint64_t amount;
+ uint32_t entries;
+
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing `%s' request\n",
+ "RESERVE");
+#endif
+ amount = GNUNET_ntohll(msg->amount);
+ entries = ntohl(msg->entries);
+ used = plugin->api->get_size (plugin->api->cls) + reserved;
+ req = amount + ((unsigned long long) GNUNET_DATASTORE_ENTRY_OVERHEAD) * entries;
+ if (used + req > quota)
+ {
+ if (quota < used)
+ used = quota; /* cheat a bit for error message (to avoid negative numbers) */
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Insufficient space (%llu bytes are available) to satisfy `%s' request for %llu bytes\n"),
+ quota - used,
+ "RESERVE",
+ req);
+ if (cache_size < req)
+ {
+ /* TODO: document this in the FAQ; essentially, if this
+ message happens, the insertion request could be blocked
+ by less-important content from migration because it is
+ larger than 1/8th of the overall available space, and
+ we only reserve 1/8th for "fresh" insertions */
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("The requested amount (%llu bytes) is larger than the cache size (%llu bytes)\n"),
+ req,
+ cache_size);
+ transmit_status (client, 0,
+ gettext_noop ("Insufficient space to satisfy request and "
+ "requested amount is larger than cache size"));
+ }
+ else
+ {
+ transmit_status (client, 0,
+ gettext_noop ("Insufficient space to satisfy request"));
+ }
+ return;
+ }
+ reserved += req;
+ e = GNUNET_malloc (sizeof(struct ReservationList));
+ e->next = reservations;
+ reservations = e;
+ e->client = client;
+ e->amount = amount;
+ e->entries = entries;
+ e->rid = ++reservation_gen;
+ if (reservation_gen < 0)
+ reservation_gen = 0; /* wrap around */
+ transmit_status (client, e->rid, NULL);
+}
+
+
+/**
+ * Handle RELEASE_RESERVE-message.
+ *
+ * @param cls closure
+ * @param client identification of the client
+ * @param message the actual message
+ */
+static void
+handle_release_reserve (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
{
- transmit_size (client);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ const struct ReleaseReserveMessage *msg = (const struct ReleaseReserveMessage*) message;
+ struct ReservationList *pos;
+ struct ReservationList *prev;
+ struct ReservationList *next;
+ int rid = ntohl(msg->rid);
+ unsigned long long rem;
+
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing `%s' request\n",
+ "RELEASE_RESERVE");
+#endif
+ next = reservations;
+ prev = NULL;
+ while (NULL != (pos = next))
+ {
+ next = pos->next;
+ if (rid == pos->rid)
+ {
+ if (prev == NULL)
+ reservations = next;
+ else
+ prev->next = next;
+ rem = pos->amount + ((unsigned long long) GNUNET_DATASTORE_ENTRY_OVERHEAD) * pos->entries;
+ GNUNET_assert (reserved >= rem);
+ reserved -= rem;
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Returning %llu remaining reserved bytes to storage pool\n",
+ rem);
+#endif
+ GNUNET_free (pos);
+ transmit_status (client, GNUNET_OK, NULL);
+ return;
+ }
+ prev = pos;
+ }
+ GNUNET_break (0);
+ transmit_status (client, GNUNET_SYSERR, gettext_noop ("Could not find matching reservation"));
}
GNUNET_break (0);
return NULL;
}
- if ( (ntohl(dm->type) == 0) ||
- (ntohl(dm->reserved) != 0) )
- {
- GNUNET_break (0);
- return NULL;
- }
return dm;
}
const struct GNUNET_MessageHeader *message)
{
const struct DataMessage *dm = check_data (message);
+ char *msg;
+ int ret;
+ int rid;
+ struct ReservationList *pos;
+ uint32_t size;
+
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing `%s' request\n",
+ "PUT");
+#endif
+ if (ntohl(dm->type) == 0)
+ {
+ GNUNET_break (0);
+ dm = NULL;
+ }
if (dm == NULL)
{
GNUNET_break (0);
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
}
- plugin->api->put (plugin->api->cls,
- &dm->key,
- ntohl(dm->size),
- &dm[1],
- ntohl(dm->type),
- ntohl(dm->priority),
- ntohl(dm->anonymity),
- GNUNET_TIME_absolute_ntoh(dm->expiration));
- transmit_size (client);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ rid = ntohl(dm->rid);
+ size = ntohl(dm->size);
+ if (rid > 0)
+ {
+ pos = reservations;
+ while ( (NULL != pos) &&
+ (rid != pos->rid) )
+ pos = pos->next;
+ GNUNET_break (pos != NULL);
+ if (NULL != pos)
+ {
+ GNUNET_break (pos->entries > 0);
+ GNUNET_break (pos->amount > size);
+ pos->entries--;
+ pos->amount -= size;
+ reserved -= (size + GNUNET_DATASTORE_ENTRY_OVERHEAD);
+ }
+ }
+ msg = NULL;
+ ret = plugin->api->put (plugin->api->cls,
+ &dm->key,
+ size,
+ &dm[1],
+ ntohl(dm->type),
+ ntohl(dm->priority),
+ ntohl(dm->anonymity),
+ GNUNET_TIME_absolute_ntoh(dm->expiration),
+ &msg);
+ if (GNUNET_OK == ret)
+ {
+ GNUNET_CONTAINER_bloomfilter_add (filter,
+ &dm->key);
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Successfully stored %u bytes under key `%s'\n",
+ size,
+ GNUNET_h2s (&dm->key));
+#endif
+ }
+ transmit_status (client,
+ (GNUNET_SYSERR == ret) ? GNUNET_SYSERR : GNUNET_OK,
+ msg);
+ GNUNET_free_non_null (msg);
+ if (quota - reserved - cache_size < plugin->api->get_size (plugin->api->cls))
+ manage_space (size + GNUNET_DATASTORE_ENTRY_OVERHEAD);
}
const struct GetMessage *msg;
uint16_t size;
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing `%s' request\n",
+ "GET");
+#endif
size = ntohs(message->size);
if ( (size != sizeof(struct GetMessage)) &&
(size != sizeof(struct GetMessage) - sizeof(GNUNET_HashCode)) )
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
}
+ GNUNET_SERVER_client_keep (client);
msg = (const struct GetMessage*) message;
+ if ( (size == sizeof(struct GetMessage)) &&
+ (GNUNET_YES != GNUNET_CONTAINER_bloomfilter_test (filter,
+ &msg->key)) )
+ {
+ /* don't bother database... */
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Empty result set for `%s' request for `%s'.\n",
+ "GET",
+ GNUNET_h2s (&msg->key));
+#endif
+ transmit_item (client,
+ NULL, NULL, 0, NULL, 0, 0, 0,
+ GNUNET_TIME_UNIT_ZERO_ABS, 0);
+ return;
+ }
plugin->api->get (plugin->api->cls,
((size == sizeof(struct GetMessage)) ? &msg->key : NULL),
NULL,
ntohl(msg->type),
&transmit_item,
client);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Handle UPDATE-message.
+ *
+ * @param cls closure
+ * @param client identification of the client
+ * @param message the actual message
+ */
+static void
+handle_update (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct UpdateMessage *msg;
+ int ret;
+ char *emsg;
+
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing `%s' request\n",
+ "UPDATE");
+#endif
+ msg = (const struct UpdateMessage*) message;
+ emsg = NULL;
+ ret = plugin->api->update (plugin->api->cls,
+ GNUNET_ntohll(msg->uid),
+ (int32_t) ntohl(msg->priority),
+ GNUNET_TIME_absolute_ntoh(msg->expiration),
+ &emsg);
+ transmit_status (client, ret, emsg);
+ GNUNET_free_non_null (emsg);
}
struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing `%s' request\n",
+ "GET_RANDOM");
+#endif
+ GNUNET_SERVER_client_keep (client);
plugin->api->iter_migration_order (plugin->api->cls,
0,
&transmit_item,
client);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
+/**
+ * Context for the 'remove_callback'.
+ */
+struct RemoveContext
+{
+ /**
+ * Client for whom we're doing the remvoing.
+ */
+ struct GNUNET_SERVER_Client *client;
+
+ /**
+ * GNUNET_YES if we managed to remove something.
+ */
+ int found;
+};
+
+
/**
* Callback function that will cause the item that is passed
* in to be deleted (by returning GNUNET_NO).
*/
static int
remove_callback (void *cls,
+ void *next_cls,
const GNUNET_HashCode * key,
uint32_t size,
const void *data,
uint32_t priority,
uint32_t anonymity,
struct GNUNET_TIME_Absolute
- expiration, unsigned long long uid)
+ expiration, uint64_t uid)
{
+ struct RemoveContext *rc = cls;
+
+ if (key == NULL)
+ {
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No further matches for `%s' request.\n",
+ "REMOVE");
+#endif
+ if (GNUNET_YES == rc->found)
+ transmit_status (rc->client, GNUNET_OK, NULL);
+ else
+ transmit_status (rc->client, GNUNET_NO, _("Content not found"));
+ GNUNET_SERVER_client_drop (rc->client);
+ GNUNET_free (rc);
+ return GNUNET_OK; /* last item */
+ }
+ rc->found = GNUNET_YES;
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Item %llu matches `%s' request.\n",
+ (unsigned long long) uid,
+ "REMOVE");
+#endif
+ GNUNET_CONTAINER_bloomfilter_remove (filter,
+ key);
+ plugin->api->next_request (next_cls, GNUNET_YES);
return GNUNET_NO;
}
{
const struct DataMessage *dm = check_data (message);
GNUNET_HashCode vhash;
+ struct RemoveContext *rc;
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing `%s' request\n",
+ "REMOVE");
+#endif
if (dm == NULL)
{
GNUNET_break (0);
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
}
+ rc = GNUNET_malloc (sizeof(struct RemoveContext));
+ GNUNET_SERVER_client_keep (client);
+ rc->client = client;
GNUNET_CRYPTO_hash (&dm[1],
ntohl(dm->size),
&vhash);
&vhash,
ntohl(dm->type),
&remove_callback,
- NULL);
- transmit_size (client);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ rc);
}
struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing `%s' request\n",
+ "DROP");
+#endif
plugin->api->drop (plugin->api->cls);
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
* service.
*/
static struct GNUNET_SERVER_MessageHandler handlers[] = {
- {&handle_init, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_INIT,
- sizeof(struct GNUNET_MessageHeader) },
+ {&handle_reserve, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_RESERVE,
+ sizeof(struct ReserveMessage) },
+ {&handle_release_reserve, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_RELEASE_RESERVE,
+ sizeof(struct ReleaseReserveMessage) },
{&handle_put, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_PUT, 0 },
+ {&handle_update, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_UPDATE,
+ sizeof (struct UpdateMessage) },
{&handle_get, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_GET, 0 },
{&handle_get_random, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_GET_RANDOM,
sizeof(struct GNUNET_MessageHeader) },
* Load the datastore plugin.
*/
static struct DatastorePlugin *
-load_plugin (struct GNUNET_CONFIGURATION_Handle *cfg,
- struct GNUNET_SCHEDULER_Handle *sched)
+load_plugin ()
{
struct DatastorePlugin *ret;
char *libname;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("Loading `%s' datastore plugin\n"), name);
GNUNET_asprintf (&libname, "libgnunet_plugin_datastore_%s", name);
- ret->short_name = GNUNET_strdup (name);
+ ret->short_name = name;
ret->lib_name = libname;
ret->api = GNUNET_PLUGIN_load (libname, &ret->env);
if (ret->api == NULL)
* Function called when the service shuts
* down. Unloads our datastore plugin.
*
- * @param cls closure
- * @param cfg configuration to use
+ * @param plug plugin to unload
*/
static void
unload_plugin (struct DatastorePlugin *plug)
}
+/**
+ * Final task run after shutdown. Unloads plugins and disconnects us from
+ * statistics.
+ */
+static void
+unload_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ unload_plugin (plugin);
+ plugin = NULL;
+ if (filter != NULL)
+ {
+ GNUNET_CONTAINER_bloomfilter_free (filter);
+ filter = NULL;
+ }
+ GNUNET_ARM_stop_services (cfg, tc->sched, "statistics", NULL);
+}
+
+
/**
* Last task run during shutdown. Disconnects us from
* the transport and core.
static void
cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- unload_plugin (plugin);
- plugin = NULL;
+ struct TransmitCallbackContext *tcc;
+
+ while (NULL != (tcc = tcc_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (tcc_head,
+ tcc_tail,
+ tcc);
+ if (tcc->th != NULL)
+ GNUNET_CONNECTION_notify_transmit_ready_cancel (tcc->th);
+ if (NULL != tcc->tc)
+ tcc->tc (tcc->tc_cls, GNUNET_SYSERR);
+ GNUNET_free (tcc->msg);
+ GNUNET_free (tcc);
+ }
+ if (expired_kill_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (sched,
+ expired_kill_task);
+ expired_kill_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_SCHEDULER_add_continuation (sched,
+ &unload_task,
+ NULL,
+ GNUNET_SCHEDULER_REASON_PREREQ_DONE);
+}
+
+
+/**
+ * Function that removes all active reservations made
+ * by the given client and releases the space for other
+ * requests.
+ *
+ * @param cls closure
+ * @param client identification of the client
+ */
+static void
+cleanup_reservations (void *cls,
+ struct GNUNET_SERVER_Client
+ * client)
+{
+ struct ReservationList *pos;
+ struct ReservationList *prev;
+ struct ReservationList *next;
+
+ if (client == NULL)
+ return;
+ prev = NULL;
+ pos = reservations;
+ while (NULL != pos)
+ {
+ next = pos->next;
+ if (pos->client == client)
+ {
+ if (prev == NULL)
+ reservations = next;
+ else
+ prev->next = next;
+ reserved -= pos->amount + pos->entries * GNUNET_DATASTORE_ENTRY_OVERHEAD;
+ GNUNET_free (pos);
+ }
+ else
+ {
+ prev = pos;
+ }
+ pos = next;
+ }
}
* Process datastore requests.
*
* @param cls closure
- * @param sched scheduler to use
+ * @param s scheduler to use
* @param server the initialized server
- * @param cfg configuration to use
+ * @param c configuration to use
*/
static void
run (void *cls,
- struct GNUNET_SCHEDULER_Handle *sched,
+ struct GNUNET_SCHEDULER_Handle *s,
struct GNUNET_SERVER_Handle *server,
- struct GNUNET_CONFIGURATION_Handle *cfg)
+ const struct GNUNET_CONFIGURATION_Handle *c)
{
- plugin = load_plugin (cfg, sched);
+ char *fn;
+ unsigned int bf_size;
+
+ sched = s;
+ cfg = c;
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg,
+ "DATASTORE", "QUOTA", "a))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("No `%s' specified for `%s' in configuration!\n"),
+ "QUOTA",
+ "DATASTORE");
+ return;
+ }
+ cache_size = quota / 8; /* Or should we make this an option? */
+ bf_size = quota / 32; /* 8 bit per entry, 1 bit per 32 kb in DB */
+ fn = NULL;
+ if ( (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (cfg,
+ "DATASTORE",
+ "BLOOMFILTER",
+ &fn)) ||
+ (GNUNET_OK !=
+ GNUNET_DISK_directory_create_for_file (fn)) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Could not use specified filename `%s' for bloomfilter.\n"),
+ fn != NULL ? fn : "");
+ GNUNET_free_non_null (fn);
+ fn = NULL;
+ }
+ filter = GNUNET_CONTAINER_bloomfilter_load (fn, bf_size, 5); /* approx. 3% false positives at max use */
+ GNUNET_free_non_null (fn);
+ if (filter == NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to initialize bloomfilter.\n"));
+ return;
+ }
+ GNUNET_ARM_start_services (cfg, sched, "statistics", NULL);
+ plugin = load_plugin ();
if (NULL == plugin)
- return;
+ {
+ GNUNET_CONTAINER_bloomfilter_free (filter);
+ filter = NULL;
+ GNUNET_ARM_stop_services (cfg, sched, "statistics", NULL);
+ return;
+ }
+ GNUNET_SERVER_disconnect_notify (server, &cleanup_reservations, NULL);
GNUNET_SERVER_add_handlers (server, handlers);
+ expired_kill_task
+ = GNUNET_SCHEDULER_add_with_priority (sched,
+ GNUNET_SCHEDULER_PRIORITY_IDLE,
+ &delete_expired, NULL);
GNUNET_SCHEDULER_add_delayed (sched,
- GNUNET_YES,
- GNUNET_SCHEDULER_PRIORITY_IDLE,
- GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
GNUNET_TIME_UNIT_FOREVER_REL,
&cleaning_task, NULL);
+
}
ret = (GNUNET_OK ==
GNUNET_SERVICE_run (argc,
argv,
- "datastore", &run, NULL, NULL, NULL)) ? 0 : 1;
+ "datastore",
+ GNUNET_SERVICE_OPTION_NONE,
+ &run, NULL)) ? 0 : 1;
return ret;
}
projects / oweals / gnunet.git / blobdiff