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Refactor geoip_get_dirreq_history() some more.
This patch avoids a bunch of allocations, and avoids using unallocated memory.
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@ -720,9 +720,9 @@ geoip_get_dirreq_history(geoip_client_action_t action,
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dirreq_type_t type)
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{
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char *result = NULL;
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smartlist_t *dirreq_times = NULL;
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smartlist_t *dirreq_completed = NULL;
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uint32_t complete = 0, timeouts = 0, running = 0;
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int i = 0, bufsize = 1024, written;
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int bufsize = 1024, written;
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dirreq_map_entry_t **ptr, **next, *ent;
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struct timeval now;
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@ -730,7 +730,7 @@ geoip_get_dirreq_history(geoip_client_action_t action,
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if (action != GEOIP_CLIENT_NETWORKSTATUS &&
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action != GEOIP_CLIENT_NETWORKSTATUS_V2)
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return NULL;
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dirreq_times = smartlist_create();
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dirreq_completed = smartlist_create();
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for (ptr = HT_START(dirreqmap, &dirreq_map); ptr; ptr = next) {
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ent = *ptr;
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if (ent->action != action || ent->type != type) {
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@ -738,24 +738,17 @@ geoip_get_dirreq_history(geoip_client_action_t action,
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continue;
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} else {
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if (ent->completed) {
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uint32_t *bytes_per_second = tor_malloc_zero(sizeof(uint32_t));
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uint32_t time_diff = (uint32_t) tv_mdiff(&ent->request_time,
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&ent->completion_time);
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if (time_diff == 0)
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time_diff = 1; /* Avoid DIV/0; "instant" answers are impossible
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* by law of nature or something, but a milisecond
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* is a bit greater than "instantly" */
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*bytes_per_second = 1000 * ent->response_size / time_diff;
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smartlist_add(dirreq_times, bytes_per_second);
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smartlist_add(dirreq_completed, ent);
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complete++;
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next = HT_NEXT_RMV(dirreqmap, &dirreq_map, ptr);
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} else {
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if (tv_mdiff(&ent->request_time, &now) / 1000 > DIRREQ_TIMEOUT)
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timeouts++;
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else
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running++;
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next = HT_NEXT_RMV(dirreqmap, &dirreq_map, ptr);
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tor_free(ent);
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}
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next = HT_NEXT_RMV(dirreqmap, &dirreq_map, ptr);
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tor_free(ent);
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}
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}
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#define DIR_REQ_GRANULARITY 4
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@ -769,18 +762,29 @@ geoip_get_dirreq_history(geoip_client_action_t action,
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written = tor_snprintf(result, bufsize, "complete=%u,timeout=%u,"
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"running=%u", complete, timeouts, running);
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if (written < 0) {
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SMARTLIST_FOREACH(dirreq_times, uint32_t *, dlt, tor_free(dlt));
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smartlist_free(dirreq_times);
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return NULL;
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tor_free(result);
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goto done;
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}
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#define MIN_DIR_REQ_RESPONSES 16
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if (complete >= MIN_DIR_REQ_RESPONSES) {
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uint32_t *dltimes = tor_malloc(sizeof(uint32_t) * complete);
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SMARTLIST_FOREACH(dirreq_times, uint32_t *, dlt, {
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dltimes[i++] = *dlt;
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tor_free(dlt);
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});
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median_uint32(dltimes, complete); /* sort */
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uint32_t *dltimes;
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/* We may have rounded 'completed' up. Here we want to use the
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* real value. */
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complete = smartlist_len(dirreq_completed);
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dltimes = tor_malloc_zero(sizeof(uint32_t) * complete);
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SMARTLIST_FOREACH_BEGIN(dirreq_completed, dirreq_map_entry_t *, ent) {
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uint32_t bytes_per_second;
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uint32_t time_diff = (uint32_t) tv_mdiff(&ent->request_time,
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&ent->completion_time);
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if (time_diff == 0)
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time_diff = 1; /* Avoid DIV/0; "instant" answers are impossible
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* by law of nature or something, but a milisecond
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* is a bit greater than "instantly" */
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bytes_per_second = 1000 * ent->response_size / time_diff;
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dltimes[ent_sl_idx] = bytes_per_second;
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} SMARTLIST_FOREACH_END(ent);
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median_uint32(dltimes, complete); /* sorts as a side effect. */
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written = tor_snprintf(result + written, bufsize - written,
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",min=%u,d1=%u,d2=%u,q1=%u,d3=%u,d4=%u,md=%u,"
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"d6=%u,d7=%u,q3=%u,d8=%u,d9=%u,max=%u",
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@ -797,13 +801,14 @@ geoip_get_dirreq_history(geoip_client_action_t action,
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dltimes[8*complete/10-1],
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dltimes[9*complete/10-1],
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dltimes[complete-1]);
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if (written<0)
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tor_free(result);
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tor_free(dltimes);
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} else {
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SMARTLIST_FOREACH(dirreq_times, uint32_t *, dlt, tor_free(dlt));
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}
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if (written < 0)
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tor_free(result);
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smartlist_free(dirreq_times);
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done:
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SMARTLIST_FOREACH(dirreq_completed, dirreq_map_entry_t *, ent,
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tor_free(ent));
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smartlist_free(dirreq_completed);
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return result;
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}
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#endif
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