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Refactor geoip_get_dirreq_history() some more.

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This patch avoids a bunch of allocations, and avoids using unallocated
memory.
This commit is contained in:
Nick Mathewson 2009-08-21 13:35:47 -04:00
parent d4a75a222f
commit b51c592547
1 changed files with 33 additions and 28 deletions
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61
src/or/geoip.c
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@ -720,9 +720,9 @@ geoip_get_dirreq_history(geoip_client_action_t action,
dirreq_type_t type)
{
char *result = NULL;
smartlist_t *dirreq_times = NULL;
smartlist_t *dirreq_completed = NULL;
uint32_t complete = 0, timeouts = 0, running = 0;
int i = 0, bufsize = 1024, written;
int bufsize = 1024, written;
dirreq_map_entry_t **ptr, **next, *ent;
struct timeval now;
@ -730,7 +730,7 @@ geoip_get_dirreq_history(geoip_client_action_t action,
if (action != GEOIP_CLIENT_NETWORKSTATUS &&
action != GEOIP_CLIENT_NETWORKSTATUS_V2)
return NULL;
dirreq_times = smartlist_create();
dirreq_completed = smartlist_create();
for (ptr = HT_START(dirreqmap, &dirreq_map); ptr; ptr = next) {
ent = *ptr;
if (ent->action != action || ent->type != type) {
@ -738,24 +738,17 @@ geoip_get_dirreq_history(geoip_client_action_t action,
continue;
} else {
if (ent->completed) {
uint32_t *bytes_per_second = tor_malloc_zero(sizeof(uint32_t));
uint32_t time_diff = (uint32_t) tv_mdiff(&ent->request_time,
&ent->completion_time);
if (time_diff == 0)
time_diff = 1; /* Avoid DIV/0; "instant" answers are impossible
* by law of nature or something, but a milisecond
* is a bit greater than "instantly" */
*bytes_per_second = 1000 * ent->response_size / time_diff;
smartlist_add(dirreq_times, bytes_per_second);
smartlist_add(dirreq_completed, ent);
complete++;
next = HT_NEXT_RMV(dirreqmap, &dirreq_map, ptr);
} else {
if (tv_mdiff(&ent->request_time, &now) / 1000 > DIRREQ_TIMEOUT)
timeouts++;
else
running++;
next = HT_NEXT_RMV(dirreqmap, &dirreq_map, ptr);
tor_free(ent);
}
next = HT_NEXT_RMV(dirreqmap, &dirreq_map, ptr);
tor_free(ent);
}
}
#define DIR_REQ_GRANULARITY 4
@ -769,18 +762,29 @@ geoip_get_dirreq_history(geoip_client_action_t action,
written = tor_snprintf(result, bufsize, "complete=%u,timeout=%u,"
"running=%u", complete, timeouts, running);
if (written < 0) {
SMARTLIST_FOREACH(dirreq_times, uint32_t *, dlt, tor_free(dlt));
smartlist_free(dirreq_times);
return NULL;
tor_free(result);
goto done;
}
#define MIN_DIR_REQ_RESPONSES 16
if (complete >= MIN_DIR_REQ_RESPONSES) {
uint32_t *dltimes = tor_malloc(sizeof(uint32_t) * complete);
SMARTLIST_FOREACH(dirreq_times, uint32_t *, dlt, {
dltimes[i++] = *dlt;
tor_free(dlt);
});
median_uint32(dltimes, complete); /* sort */
uint32_t *dltimes;
/* We may have rounded 'completed' up. Here we want to use the
* real value. */
complete = smartlist_len(dirreq_completed);
dltimes = tor_malloc_zero(sizeof(uint32_t) * complete);
SMARTLIST_FOREACH_BEGIN(dirreq_completed, dirreq_map_entry_t *, ent) {
uint32_t bytes_per_second;
uint32_t time_diff = (uint32_t) tv_mdiff(&ent->request_time,
&ent->completion_time);
if (time_diff == 0)
time_diff = 1; /* Avoid DIV/0; "instant" answers are impossible
* by law of nature or something, but a milisecond
* is a bit greater than "instantly" */
bytes_per_second = 1000 * ent->response_size / time_diff;
dltimes[ent_sl_idx] = bytes_per_second;
} SMARTLIST_FOREACH_END(ent);
median_uint32(dltimes, complete); /* sorts as a side effect. */
written = tor_snprintf(result + written, bufsize - written,
",min=%u,d1=%u,d2=%u,q1=%u,d3=%u,d4=%u,md=%u,"
"d6=%u,d7=%u,q3=%u,d8=%u,d9=%u,max=%u",
@ -797,13 +801,14 @@ geoip_get_dirreq_history(geoip_client_action_t action,
dltimes[8*complete/10-1],
dltimes[9*complete/10-1],
dltimes[complete-1]);
if (written<0)
tor_free(result);
tor_free(dltimes);
} else {
SMARTLIST_FOREACH(dirreq_times, uint32_t *, dlt, tor_free(dlt));
}
if (written < 0)
tor_free(result);
smartlist_free(dirreq_times);
done:
SMARTLIST_FOREACH(dirreq_completed, dirreq_map_entry_t *, ent,
tor_free(ent));
smartlist_free(dirreq_completed);
return result;
}
#endif