/**
* @file fs/gnunet-service-fs_lc.c
- * @brief API to handle 'connected peers'
+ * @brief API to handle 'local clients'
* @author Christian Grothoff
*/
#include "platform.h"
+#include "gnunet-service-fs.h"
#include "gnunet-service-fs_lc.h"
+#include "gnunet-service-fs_cp.h"
+#include "gnunet-service-fs_pr.h"
/**
*/
struct GSF_LocalClient *lc;
-};
+ /**
+ * Task scheduled to destroy the request.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier kill_task;
+};
/**
};
-
/**
* A local client.
*/
struct GSF_LocalClient *pos;
pos = client_head;
- while ( (pos != NULL) &&
- (pos->client != client) )
+ while ((pos != NULL) && (pos->client != client))
pos = pos->next;
if (pos != NULL)
return pos;
pos = GNUNET_malloc (sizeof (struct GSF_LocalClient));
pos->client = client;
- GNUNET_CONTAINER_DLL_insert (client_head,
- client_tail,
- pos);
+ GNUNET_CONTAINER_DLL_insert (client_head, client_tail, pos);
return pos;
}
+/**
+ * Free the given client request.
+ *
+ * @param cls the client request to free
+ * @param tc task context
+ */
+static void
+client_request_destroy (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct ClientRequest *cr = cls;
+ struct GSF_LocalClient *lc;
+
+ cr->kill_task = GNUNET_SCHEDULER_NO_TASK;
+ lc = cr->lc;
+ GNUNET_CONTAINER_DLL_remove (lc->cr_head, lc->cr_tail, cr);
+ GSF_pending_request_cancel_ (cr->pr, GNUNET_NO);
+ GNUNET_STATISTICS_update (GSF_stats,
+ gettext_noop ("# client searches active"), -1,
+ GNUNET_NO);
+ GNUNET_free (cr);
+}
+
+
+/**
+ * Handle a reply to a pending request. Also called if a request
+ * expires (then with data == NULL). The handler may be called
+ * many times (depending on the request type), but will not be
+ * called during or after a call to GSF_pending_request_cancel
+ * and will also not be called anymore after a call signalling
+ * expiration.
+ *
+ * @param cls user-specified closure
+ * @param eval evaluation of the result
+ * @param pr handle to the original pending request
+ * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
+ * @param expiration when does 'data' expire?
+ * @param last_transmission when was the last time we've tried to download this block? (FOREVER if unknown)
+ * @param type type of the block
+ * @param data response data, NULL on request expiration
+ * @param data_len number of bytes in data
+ */
+static void
+client_response_handler (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
+ struct GSF_PendingRequest *pr,
+ uint32_t reply_anonymity_level,
+ struct GNUNET_TIME_Absolute expiration,
+ struct GNUNET_TIME_Absolute last_transmission,
+ enum GNUNET_BLOCK_Type type, const void *data,
+ size_t data_len)
+{
+ struct ClientRequest *cr = cls;
+ struct GSF_LocalClient *lc;
+ struct ClientPutMessage *pm;
+ const struct GSF_PendingRequestData *prd;
+ size_t msize;
+
+ if (NULL == data)
+ {
+ /* ugh, request 'timed out' -- how can this be? */
+ GNUNET_break (0);
+ return;
+ }
+ prd = GSF_pending_request_get_data_ (pr);
+ GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
+ if ((prd->type != type) && (prd->type != GNUNET_BLOCK_TYPE_ANY))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ GNUNET_STATISTICS_update (GSF_stats,
+ gettext_noop
+ ("# replies received for local clients"), 1,
+ GNUNET_NO);
+ GNUNET_assert (pr == cr->pr);
+ lc = cr->lc;
+ msize = sizeof (struct ClientPutMessage) + data_len;
+ {
+ char buf[msize];
+
+ pm = (struct ClientPutMessage *) buf;
+ pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
+ pm->header.size = htons (msize);
+ pm->type = htonl (type);
+ pm->expiration = GNUNET_TIME_absolute_hton (expiration);
+ pm->last_transmission = GNUNET_TIME_absolute_hton (last_transmission);
+ memcpy (&pm[1], data, data_len);
+ GSF_local_client_transmit_ (lc, &pm->header);
+ }
+#if DEBUG_FS_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Queued reply to query `%s' for local client\n",
+ GNUNET_h2s (&prd->query), (unsigned int) prd->type);
+#endif
+ if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
+ return;
+ if (GNUNET_SCHEDULER_NO_TASK != cr->kill_task)
+ cr->kill_task = GNUNET_SCHEDULER_add_now (&client_request_destroy, cr);
+}
+
+
/**
* Handle START_SEARCH-message (search request from local client).
+ * Only responsible for creating the request entry itself and setting
+ * up reply callback and cancellation on client disconnect. Does NOT
+ * execute the actual request strategy (planning).
*
* @param client identification of the client
* @param message the actual message
- * @return pending request handle for the request, NULL on error
+ * @param prptr where to store the pending request handle for the request
+ * @return GNUNET_YES to start local processing,
+ * GNUNET_NO to not (yet) start local processing,
+ * GNUNET_SYSERR on error
*/
-struct GSF_PendingRequest *
+int
GSF_local_client_start_search_handler_ (struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+ const struct GNUNET_MessageHeader
+ *message,
+ struct GSF_PendingRequest **prptr)
{
static GNUNET_HashCode all_zeros;
const struct SearchMessage *sm;
struct GSF_LocalClient *lc;
struct ClientRequest *cr;
- struct GSF_PendingRequest *pr;
+ struct GSF_PendingRequestData *prd;
uint16_t msize;
unsigned int sc;
enum GNUNET_BLOCK_Type type;
enum GSF_PendingRequestOptions options;
msize = ntohs (message->size);
- if ( (msize < sizeof (struct SearchMessage)) ||
- (0 != (msize - sizeof (struct SearchMessage)) % sizeof (GNUNET_HashCode)) )
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client,
- GNUNET_SYSERR);
- return NULL;
- }
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# client searches received"),
- 1,
- GNUNET_NO);
+ if ((msize < sizeof (struct SearchMessage)) ||
+ (0 != (msize - sizeof (struct SearchMessage)) % sizeof (GNUNET_HashCode)))
+ {
+ GNUNET_break (0);
+ *prptr = NULL;
+ return GNUNET_SYSERR;
+ }
+ GNUNET_STATISTICS_update (GSF_stats,
+ gettext_noop ("# client searches received"), 1,
+ GNUNET_NO);
sc = (msize - sizeof (struct SearchMessage)) / sizeof (GNUNET_HashCode);
- sm = (const struct SearchMessage*) message;
+ sm = (const struct SearchMessage *) message;
type = ntohl (sm->type);
-#if DEBUG_FS
+#if DEBUG_FS_CLIENT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received request for `%s' of type %u from local client\n",
- GNUNET_h2s (&sm->query),
- (unsigned int) type);
+ "Received request for `%s' of type %u from local client\n",
+ GNUNET_h2s (&sm->query), (unsigned int) type);
#endif
lc = GSF_local_client_lookup_ (client);
-
+ cr = NULL;
/* detect duplicate KBLOCK requests */
- if ( (type == GNUNET_BLOCK_TYPE_FS_KBLOCK) ||
- (type == GNUNET_BLOCK_TYPE_FS_NBLOCK) ||
- (type == GNUNET_BLOCK_TYPE_ANY) )
+ if ((type == GNUNET_BLOCK_TYPE_FS_KBLOCK) ||
+ (type == GNUNET_BLOCK_TYPE_FS_NBLOCK) || (type == GNUNET_BLOCK_TYPE_ANY))
+ {
+ cr = lc->cr_head;
+ while (cr != NULL)
{
- cr = lc->cr_head;
- while ( (cl != NULL) &&
- ( (0 != memcmp (GSF_pending_request_get_query_ (cr->pr),
- &sm->query,
- sizeof (GNUNET_HashCode))) ||
- (GSF_pending_request_get_type_ (cr->pr) != type) ) )
- cr = cr->next;
- if (crl != NULL)
- {
-#if DEBUG_FS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Have existing request, merging content-seen lists.\n");
-#endif
- GSF_pending_request_update_ (cr->pr,
- &sm[1],
- sc);
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# client searches updated (merged content seen list)"),
- 1,
- GNUNET_NO);
- GNUNET_SERVER_receive_done (client,
- GNUNET_OK);
- return NULL;
- }
+ prd = GSF_pending_request_get_data_ (cr->pr);
+ /* only unify with queries that hae not yet started local processing
+ (SEARCH_MESSAGE_OPTION_CONTINUED was always set) and that have a
+ matching query and type */
+ if ((GNUNET_YES != prd->has_started) &&
+ (0 != memcmp (&prd->query, &sm->query, sizeof (GNUNET_HashCode))) &&
+ (prd->type == type))
+ break;
+ cr = cr->next;
}
-
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# client searches active"),
- 1,
- GNUNET_NO);
- cr = GNUNET_malloc (sizeof (struct ClientRequest));
- cr->lc = lc;
- GNUNET_CONTAINER_DLL_insert (lc->cr_head,
- lc->cr_tail,
- cr);
- options = GSF_PRO_LOCAL_REQUEST;
- if (0 != (1 & ntohl (sm->options)))
- options |= GSF_PRO_LOCAL_ONLY;
- cr->pr = GSF_pending_request_create_ (options,
- type,
- &sm->query,
- (type == GNUNET_BLOCK_TYPE_SBLOCK)
- ? &sm->target /* namespace */
- : NULL,
- (0 != memcmp (&sm->target,
- &all_zeros,
- sizeof (GNUNET_HashCode)))
- ? &sm->target,
- : NULL,
- NULL /* bf */, 0 /* mingle */,
- ntohl (sm->anonymity_level),
- 0 /* priority */,
- &sm[1], sc,
- &client_response_handler,
- cr);
- return cr->pr;
+ }
+ if (cr != NULL)
+ {
+#if DEBUG_FS_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Have existing request, merging content-seen lists.\n");
+#endif
+ GSF_pending_request_update_ (cr->pr, (const GNUNET_HashCode *) &sm[1], sc);
+ GNUNET_STATISTICS_update (GSF_stats,
+ gettext_noop
+ ("# client searches updated (merged content seen list)"),
+ 1, GNUNET_NO);
+ }
+ else
+ {
+ GNUNET_STATISTICS_update (GSF_stats,
+ gettext_noop ("# client searches active"), 1,
+ GNUNET_NO);
+ cr = GNUNET_malloc (sizeof (struct ClientRequest));
+ cr->lc = lc;
+ GNUNET_CONTAINER_DLL_insert (lc->cr_head, lc->cr_tail, cr);
+ options = GSF_PRO_LOCAL_REQUEST;
+ if (0 != (SEARCH_MESSAGE_OPTION_LOOPBACK_ONLY & ntohl (sm->options)))
+ options |= GSF_PRO_LOCAL_ONLY;
+ cr->pr = GSF_pending_request_create_ (options, type, &sm->query, (type == GNUNET_BLOCK_TYPE_FS_SBLOCK) ? &sm->target /* namespace */
+ : NULL,
+ (0 !=
+ memcmp (&sm->target, &all_zeros,
+ sizeof (GNUNET_HashCode)))
+ ? (const struct GNUNET_PeerIdentity *)
+ &sm->target : NULL, NULL, 0,
+ 0 /* bf */ ,
+ ntohl (sm->anonymity_level),
+ 0 /* priority */ ,
+ 0 /* ttl */ ,
+ 0 /* sender PID */ ,
+ 0 /* origin PID */ ,
+ (const GNUNET_HashCode *) &sm[1], sc,
+ &client_response_handler, cr);
+ }
+ *prptr = cr->pr;
+ return (0 !=
+ (SEARCH_MESSAGE_OPTION_CONTINUED & ntohl (sm->options))) ? GNUNET_NO :
+ GNUNET_YES;
}
* @return number of bytes written to buf
*/
static size_t
-transmit_to_client (void *cls,
- size_t size,
- void *buf)
+transmit_to_client (void *cls, size_t size, void *buf)
{
struct GSF_LocalClient *lc = cls;
char *cbuf = buf;
struct ClientResponse *res;
size_t msize;
-
- cl->th = NULL;
+
+ lc->th = NULL;
if (NULL == buf)
return 0;
msize = 0;
- while ( (NULL != (res = lc->res_head) ) &&
- (res->msize <= size) )
- {
- memcpy (&cbuf[msize], &res[1], res->msize);
- msize += res->msize;
- size -= res->msize;
- GNUNET_CONTAINER_DLL_remove (cl->res_head,
- cl->res_tail,
- res);
- GNUNET_free (res);
- }
+ while ((NULL != (res = lc->res_head)) && (res->msize <= size))
+ {
+ memcpy (&cbuf[msize], &res[1], res->msize);
+ msize += res->msize;
+ size -= res->msize;
+ GNUNET_CONTAINER_DLL_remove (lc->res_head, lc->res_tail, res);
+ GNUNET_free (res);
+ }
if (NULL != res)
- lc->th = GNUNET_SERVER_notify_transmit_ready (lc->client,
- res->msize,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &transmit_to_client,
- lc);
+ lc->th =
+ GNUNET_SERVER_notify_transmit_ready (lc->client, res->msize,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &transmit_to_client, lc);
return msize;
}
*/
void
GSF_local_client_transmit_ (struct GSF_LocalClient *lc,
- const struct GNUNET_MessageHeader *msg)
+ const struct GNUNET_MessageHeader *msg)
{
struct ClientResponse *res;
size_t msize;
res = GNUNET_malloc (sizeof (struct ClientResponse) + msize);
res->lc = lc;
res->msize = msize;
- GNUNET_CONTAINER_DLL_insert_tail (lc->res_head,
- lc->res_tail,
- res);
- if (NULL == lc->tc)
- lc->tc = GNUNET_CLIENT_notify_transmit_ready (lc->client,
- msize,
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_NO,
- &transmit_to_client,
- lc);
+ memcpy (&res[1], msg, msize);
+ GNUNET_CONTAINER_DLL_insert_tail (lc->res_head, lc->res_tail, res);
+ if (NULL == lc->th)
+ lc->th =
+ GNUNET_SERVER_notify_transmit_ready (lc->client, msize,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &transmit_to_client, lc);
}
* @param client handle of the client
*/
void
-GSF_client_disconnect_handler_ (void *cls,
- const struct GNUNET_SERVER_Client *client)
+GSF_client_disconnect_handler_ (void *cls, struct GNUNET_SERVER_Client *client)
{
struct GSF_LocalClient *pos;
- struct DisconnectCallback *dc;
struct ClientRequest *cr;
struct ClientResponse *res;
pos = client_head;
- while ( (pos != NULL) &&
- (pos->client != client) )
+ while ((pos != NULL) && (pos->client != client))
pos = pos->next;
if (pos == NULL)
- return pos;
+ return;
while (NULL != (cr = pos->cr_head))
- {
- GNUNET_CONTAINER_DLL_remove (pos->cr_head,
- pos->cr_tail,
- cr);
- GSF_pending_request_cancel_ (cr->pr);
- GNUNET_free (cr);
- }
+ {
+ GNUNET_CONTAINER_DLL_remove (pos->cr_head, pos->cr_tail, cr);
+ GSF_pending_request_cancel_ (cr->pr, GNUNET_NO);
+ GNUNET_STATISTICS_update (GSF_stats,
+ gettext_noop ("# client searches active"), -1,
+ GNUNET_NO);
+ if (GNUNET_SCHEDULER_NO_TASK != cr->kill_task)
+ GNUNET_SCHEDULER_cancel (cr->kill_task);
+ GNUNET_free (cr);
+ }
while (NULL != (res = pos->res_head))
- {
- GNUNET_CONTAINER_DLL_remove (pos->res_head,
- pos->res_tail,
- res);
- GNUNET_free (res);
- }
+ {
+ GNUNET_CONTAINER_DLL_remove (pos->res_head, pos->res_tail, res);
+ GNUNET_free (res);
+ }
if (pos->th != NULL)
- {
- GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
- pos->th = NULL;
- }
+ {
+ GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
+ pos->th = NULL;
+ }
GSF_handle_local_client_disconnect_ (pos);
+ GNUNET_CONTAINER_DLL_remove (client_head, client_tail, pos);
GNUNET_free (pos);
}
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