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19 * @file scalarproduct/scalarproduct_api.c
20 * @brief API for the scalarproduct
21 * @author Christian Fuchs
22 * @author Gaurav Kukreja
23 * @author Christian Grothoff
26 #include "gnunet_util_lib.h"
27 #include "gnunet_statistics_service.h"
28 #include "gnunet_scalarproduct_service.h"
29 #include "gnunet_protocols.h"
30 #include "scalarproduct.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "scalarproduct-api",__VA_ARGS__)
36 * The abstraction function for our internal callback
38 * @param h computation handle
39 * @param msg response we got, NULL on errors
40 * @param status processing status code
43 (*GNUNET_SCALARPRODUCT_ResponseMessageHandler) (struct GNUNET_SCALARPRODUCT_ComputationHandle *h,
44 const struct ClientResponseMessage *msg,
45 enum GNUNET_SCALARPRODUCT_ResponseStatus status);
49 * A handle returned for each computation
51 struct GNUNET_SCALARPRODUCT_ComputationHandle
56 const struct GNUNET_CONFIGURATION_Handle *cfg;
59 * Current connection to the scalarproduct service.
61 struct GNUNET_MQ_Handle *mq;
64 * Function to call after transmission of the request (Bob).
66 GNUNET_SCALARPRODUCT_ContinuationWithStatus cont_status;
69 * Function to call after transmission of the request (Alice).
71 GNUNET_SCALARPRODUCT_DatumProcessor cont_datum;
74 * Closure for @e cont_status or @e cont_datum.
79 * API internal callback for results and failures to be forwarded to
82 GNUNET_SCALARPRODUCT_ResponseMessageHandler response_proc;
85 * The shared session key identifying this computation
87 struct GNUNET_HashCode key;
93 * Called when a response is received from the service. Perform basic
94 * check that the message is well-formed.
96 * @param cls Pointer to the Master Context
97 * @param message Pointer to the data received in response
98 * @return #GNUNET_OK if @a message is well-formed
101 check_response (void *cls,
102 const struct ClientResponseMessage *message)
104 if (ntohs (message->header.size) !=
105 ntohl (message->product_length) + sizeof (struct ClientResponseMessage))
108 return GNUNET_SYSERR;
115 * Handles the STATUS received from the service for a response, does
116 * not contain a payload. Called when we participate as "Bob" via
117 * #GNUNET_SCALARPRODUCT_accept_computation().
119 * @param h our Handle
120 * @param msg the response received
121 * @param status the condition the request was terminated with (eg: disconnect)
124 process_status_message (struct GNUNET_SCALARPRODUCT_ComputationHandle *h,
125 const struct ClientResponseMessage *msg,
126 enum GNUNET_SCALARPRODUCT_ResponseStatus status)
128 if (NULL != h->cont_status)
129 h->cont_status (h->cont_cls,
131 GNUNET_SCALARPRODUCT_cancel (h);
136 * Called when a response is received from the service. After basic
137 * check, the handler in `h->response_proc` is called. This functions
138 * handles the response to the client which used the API.
140 * @param cls Pointer to the Master Context
141 * @param msg Pointer to the data received in response
144 handle_response (void *cls,
145 const struct ClientResponseMessage *message)
147 struct GNUNET_SCALARPRODUCT_ComputationHandle *h = cls;
148 enum GNUNET_SCALARPRODUCT_ResponseStatus status;
150 status = (enum GNUNET_SCALARPRODUCT_ResponseStatus) ntohl (message->status);
158 * Check if the keys for all given elements are unique.
160 * @param elements elements to check
161 * @param element_count size of the @a elements array
162 * @return #GNUNET_OK if all keys are unique
165 check_unique (const struct GNUNET_SCALARPRODUCT_Element *elements,
166 uint32_t element_count)
168 struct GNUNET_CONTAINER_MultiHashMap *map;
173 map = GNUNET_CONTAINER_multihashmap_create (2 * element_count,
175 for (i=0;i<element_count;i++)
177 GNUNET_CONTAINER_multihashmap_put (map,
180 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
182 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
183 _("Keys given to SCALARPRODUCT not unique!\n"));
186 GNUNET_CONTAINER_multihashmap_destroy (map);
192 * We encountered an error communicating with the set service while
193 * performing a set operation. Report to the application.
195 * @param cls the `struct GNUNET_SCALARPRODUCT_ComputationHandle`
196 * @param error error code
199 mq_error_handler (void *cls,
200 enum GNUNET_MQ_Error error)
202 struct GNUNET_SCALARPRODUCT_ComputationHandle *h = cls;
204 LOG (GNUNET_ERROR_TYPE_INFO,
205 "Disconnected from SCALARPRODUCT service.\n");
208 GNUNET_SCALARPRODUCT_STATUS_DISCONNECTED);
213 * Used by Bob's client to cooperate with Alice,
215 * @param cfg the gnunet configuration handle
216 * @param key Session key unique to the requesting client
217 * @param elements Array of elements of the vector
218 * @param element_count Number of elements in the @a elements vector
219 * @param cont Callback function
220 * @param cont_cls Closure for @a cont
221 * @return a new handle for this computation
223 struct GNUNET_SCALARPRODUCT_ComputationHandle *
224 GNUNET_SCALARPRODUCT_accept_computation (const struct GNUNET_CONFIGURATION_Handle *cfg,
225 const struct GNUNET_HashCode *session_key,
226 const struct GNUNET_SCALARPRODUCT_Element *elements,
227 uint32_t element_count,
228 GNUNET_SCALARPRODUCT_ContinuationWithStatus cont,
231 struct GNUNET_SCALARPRODUCT_ComputationHandle *h
232 = GNUNET_new (struct GNUNET_SCALARPRODUCT_ComputationHandle);
233 struct GNUNET_MQ_MessageHandler handlers[] = {
234 GNUNET_MQ_hd_var_size (response,
235 GNUNET_MESSAGE_TYPE_SCALARPRODUCT_RESULT,
236 struct ClientResponseMessage,
238 GNUNET_MQ_handler_end ()
240 struct GNUNET_MQ_Envelope *env;
241 struct BobComputationMessage *msg;
242 struct ComputationBobCryptodataMultipartMessage *mmsg;
246 uint32_t element_count_transfered;
249 if (GNUNET_SYSERR == check_unique (elements,
252 h->cont_status = cont;
253 h->cont_cls = cont_cls;
254 h->response_proc = &process_status_message;
256 h->key = *session_key;
257 h->mq = GNUNET_CLIENT_connect (cfg,
264 /* scalarproduct configuration error */
269 possible = (GNUNET_MAX_MESSAGE_SIZE - 1 - sizeof (struct BobComputationMessage))
270 / sizeof (struct GNUNET_SCALARPRODUCT_Element);
271 todo = GNUNET_MIN (possible,
273 size = todo * sizeof (struct GNUNET_SCALARPRODUCT_Element);
274 env = GNUNET_MQ_msg_extra (msg,
276 GNUNET_MESSAGE_TYPE_SCALARPRODUCT_CLIENT_TO_BOB);
277 msg->element_count_total = htonl (element_count);
278 msg->element_count_contained = htonl (todo);
279 msg->session_key = *session_key;
280 GNUNET_memcpy (&msg[1],
283 element_count_transfered = todo;
284 GNUNET_MQ_send (h->mq,
286 possible = (GNUNET_MAX_MESSAGE_SIZE - 1 - sizeof (*mmsg))
287 / sizeof (struct GNUNET_SCALARPRODUCT_Element);
288 while (element_count_transfered < element_count)
290 todo = GNUNET_MIN (possible,
291 element_count - element_count_transfered);
292 size = todo * sizeof (struct GNUNET_SCALARPRODUCT_Element);
293 env = GNUNET_MQ_msg_extra (mmsg,
295 GNUNET_MESSAGE_TYPE_SCALARPRODUCT_CLIENT_MULTIPART_BOB);
296 mmsg->element_count_contained = htonl (todo);
297 GNUNET_memcpy (&mmsg[1],
298 &elements[element_count_transfered],
300 element_count_transfered += todo;
301 GNUNET_MQ_send (h->mq,
309 * Handles the RESULT received from the service for a request, should
310 * contain a result MPI value. Called when we participate as "Alice" via
311 * #GNUNET_SCALARPRODUCT_start_computation().
313 * @param h our Handle
314 * @param msg Pointer to the response received
315 * @param status the condition the request was terminated with (eg: disconnect)
318 process_result_message (struct GNUNET_SCALARPRODUCT_ComputationHandle *h,
319 const struct ClientResponseMessage *msg,
320 enum GNUNET_SCALARPRODUCT_ResponseStatus status)
322 uint32_t product_len;
323 gcry_mpi_t result = NULL;
328 if (GNUNET_SCALARPRODUCT_STATUS_SUCCESS == status)
330 result = gcry_mpi_new (0);
332 product_len = ntohl (msg->product_length);
336 if (0 != (rc = gcry_mpi_scan (&num, GCRYMPI_FMT_STD,
341 LOG_GCRY (GNUNET_ERROR_TYPE_ERROR,
344 gcry_mpi_release (result);
346 status = GNUNET_SCALARPRODUCT_STATUS_INVALID_RESPONSE;
350 if (0 < (int32_t) ntohl (msg->range))
351 gcry_mpi_add (result, result, num);
353 gcry_mpi_sub (result, result, num);
354 gcry_mpi_release (num);
358 if (NULL != h->cont_datum)
359 h->cont_datum (h->cont_cls,
363 gcry_mpi_release (result);
364 GNUNET_SCALARPRODUCT_cancel (h);
369 * Request by Alice's client for computing a scalar product
371 * @param cfg the gnunet configuration handle
372 * @param session_key Session key should be unique to the requesting client
373 * @param peer PeerID of the other peer
374 * @param elements Array of elements of the vector
375 * @param element_count Number of elements in the @a elements vector
376 * @param cont Callback function
377 * @param cont_cls Closure for @a cont
378 * @return a new handle for this computation
380 struct GNUNET_SCALARPRODUCT_ComputationHandle *
381 GNUNET_SCALARPRODUCT_start_computation (const struct GNUNET_CONFIGURATION_Handle *cfg,
382 const struct GNUNET_HashCode *session_key,
383 const struct GNUNET_PeerIdentity *peer,
384 const struct GNUNET_SCALARPRODUCT_Element *elements,
385 uint32_t element_count,
386 GNUNET_SCALARPRODUCT_DatumProcessor cont,
389 struct GNUNET_SCALARPRODUCT_ComputationHandle *h
390 = GNUNET_new (struct GNUNET_SCALARPRODUCT_ComputationHandle);
391 struct GNUNET_MQ_MessageHandler handlers[] = {
392 GNUNET_MQ_hd_var_size (response,
393 GNUNET_MESSAGE_TYPE_SCALARPRODUCT_RESULT,
394 struct ClientResponseMessage,
396 GNUNET_MQ_handler_end ()
398 struct GNUNET_MQ_Envelope *env;
399 struct AliceComputationMessage *msg;
400 struct ComputationBobCryptodataMultipartMessage *mmsg;
404 uint32_t element_count_transfered;
406 if (GNUNET_SYSERR == check_unique (elements,
409 h->mq = GNUNET_CLIENT_connect (cfg,
410 "scalarproduct-alice",
416 /* missconfigured scalarproduct service */
421 h->cont_datum = cont;
422 h->cont_cls = cont_cls;
423 h->response_proc = &process_result_message;
425 h->key = *session_key;
427 possible = (GNUNET_MAX_MESSAGE_SIZE - 1 - sizeof (struct AliceComputationMessage))
428 / sizeof (struct GNUNET_SCALARPRODUCT_Element);
429 todo = GNUNET_MIN (possible,
431 size = todo * sizeof (struct GNUNET_SCALARPRODUCT_Element);
432 env = GNUNET_MQ_msg_extra (msg,
434 GNUNET_MESSAGE_TYPE_SCALARPRODUCT_CLIENT_TO_ALICE);
435 msg->element_count_total = htonl (element_count);
436 msg->element_count_contained = htonl (todo);
437 msg->reserved = htonl (0);
439 msg->session_key = *session_key;
440 GNUNET_memcpy (&msg[1],
443 GNUNET_MQ_send (h->mq,
445 element_count_transfered = todo;
446 possible = (GNUNET_MAX_MESSAGE_SIZE - 1 - sizeof (*mmsg))
447 / sizeof (struct GNUNET_SCALARPRODUCT_Element);
448 while (element_count_transfered < element_count)
450 todo = GNUNET_MIN (possible,
451 element_count - element_count_transfered);
452 size = todo * sizeof (struct GNUNET_SCALARPRODUCT_Element);
453 env = GNUNET_MQ_msg_extra (mmsg,
455 GNUNET_MESSAGE_TYPE_SCALARPRODUCT_CLIENT_MULTIPART_ALICE);
456 mmsg->element_count_contained = htonl (todo);
457 GNUNET_memcpy (&mmsg[1],
458 &elements[element_count_transfered],
460 element_count_transfered += todo;
461 GNUNET_MQ_send (h->mq,
469 * Cancel an ongoing computation or revoke our collaboration offer.
470 * Closes the connection to the service
472 * @param h computation handle to terminate
475 GNUNET_SCALARPRODUCT_cancel (struct GNUNET_SCALARPRODUCT_ComputationHandle *h)
479 GNUNET_MQ_destroy (h->mq);
486 /* end of scalarproduct_api.c */