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Send more descriptor requests per attempt when using tunneled connections

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This commit is contained in:
Arlo Breault 2014-09-23 12:22:28 -04:00 committed by Nick Mathewson
parent 21d5dbd474
commit 5ed5ac185b
2 changed files with 82 additions and 75 deletions
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3
src/or/directory.c
View File

@ -1261,7 +1261,8 @@ directory_send_command(dir_connection_t *conn,
return;
}
if (strlen(proxystring) + strlen(url) >= 4096) {
/* warn in the non-tunneled case */
if (direct && (strlen(proxystring) + strlen(url) >= 4096)) {
log_warn(LD_BUG,
"Squid does not like URLs longer than 4095 bytes, and this "
"one is %d bytes long: %s%s",

154
src/or/routerlist.c
View File

@ -4354,8 +4354,16 @@ MOCK_IMPL(STATIC void, initiate_descriptor_downloads,
* 4058/41 (40 for the hash and 1 for the + that separates them) => 98
* So use 96 because it's a nice number.
*/
#define MAX_DL_PER_REQUEST 96
#define MAX_MICRODESC_DL_PER_REQUEST 92
int
max_dl_per_request(const or_options_t *options, int purpose)
{
int max = 96;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
max = options->TunnelDirConns ? 1000 : 92;
}
return max;
}
/** Don't split our requests so finely that we are requesting fewer than
* this number per server. */
#define MIN_DL_PER_REQUEST 4
@ -4377,92 +4385,89 @@ launch_descriptor_downloads(int purpose,
smartlist_t *downloadable,
const routerstatus_t *source, time_t now)
{
int should_delay = 0, n_downloadable;
const or_options_t *options = get_options();
const char *descname;
const int fetch_microdesc = (purpose == DIR_PURPOSE_FETCH_MICRODESC);
tor_assert(purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
purpose == DIR_PURPOSE_FETCH_MICRODESC);
tor_assert(fetch_microdesc || purpose == DIR_PURPOSE_FETCH_SERVERDESC);
descname = fetch_microdesc ? "microdesc" : "routerdesc";
descname = (purpose == DIR_PURPOSE_FETCH_SERVERDESC) ?
"routerdesc" : "microdesc";
int n_downloadable = smartlist_len(downloadable);
if (!n_downloadable)
return;
n_downloadable = smartlist_len(downloadable);
if (!directory_fetches_dir_info_early(options)) {
if (n_downloadable >= MAX_DL_TO_DELAY) {
log_debug(LD_DIR,
"There are enough downloadable %ss to launch requests.",
descname);
should_delay = 0;
} else {
should_delay = (last_descriptor_download_attempted +
options->TestingClientMaxIntervalWithoutRequest) > now;
if (!should_delay && n_downloadable) {
if (last_descriptor_download_attempted) {
log_info(LD_DIR,
"There are not many downloadable %ss, but we've "
"been waiting long enough (%d seconds). Downloading.",
descname,
(int)(now-last_descriptor_download_attempted));
} else {
log_info(LD_DIR,
"There are not many downloadable %ss, but we haven't "
"tried downloading descriptors recently. Downloading.",
descname);
}
/* should delay */
if ((last_descriptor_download_attempted +
options->TestingClientMaxIntervalWithoutRequest) > now)
return;
if (last_descriptor_download_attempted) {
log_info(LD_DIR,
"There are not many downloadable %ss, but we've "
"been waiting long enough (%d seconds). Downloading.",
descname,
(int)(now-last_descriptor_download_attempted));
} else {
log_info(LD_DIR,
"There are not many downloadable %ss, but we haven't "
"tried downloading descriptors recently. Downloading.",
descname);
}
}
}
if (! should_delay && n_downloadable) {
int i, n_per_request;
const char *req_plural = "", *rtr_plural = "";
int pds_flags = PDS_RETRY_IF_NO_SERVERS;
if (! authdir_mode_any_nonhidserv(options)) {
/* If we wind up going to the authorities, we want to only open one
* connection to each authority at a time, so that we don't overload
* them. We do this by setting PDS_NO_EXISTING_SERVERDESC_FETCH
* regardless of whether we're a cache or not; it gets ignored if we're
* not calling router_pick_trusteddirserver.
*
* Setting this flag can make initiate_descriptor_downloads() ignore
* requests. We need to make sure that we do in fact call
* update_router_descriptor_downloads() later on, once the connections
* have succeeded or failed.
*/
pds_flags |= (purpose == DIR_PURPOSE_FETCH_MICRODESC) ?
PDS_NO_EXISTING_MICRODESC_FETCH :
PDS_NO_EXISTING_SERVERDESC_FETCH;
}
n_per_request = CEIL_DIV(n_downloadable, MIN_REQUESTS);
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
if (n_per_request > MAX_MICRODESC_DL_PER_REQUEST)
n_per_request = MAX_MICRODESC_DL_PER_REQUEST;
} else {
if (n_per_request > MAX_DL_PER_REQUEST)
n_per_request = MAX_DL_PER_REQUEST;
}
if (n_per_request < MIN_DL_PER_REQUEST)
n_per_request = MIN_DL_PER_REQUEST;
if (n_downloadable > n_per_request)
req_plural = rtr_plural = "s";
else if (n_downloadable > 1)
rtr_plural = "s";
log_info(LD_DIR,
"Launching %d request%s for %d %s%s, %d at a time",
CEIL_DIV(n_downloadable, n_per_request), req_plural,
n_downloadable, descname, rtr_plural, n_per_request);
smartlist_sort_digests(downloadable);
for (i=0; i < n_downloadable; i += n_per_request) {
initiate_descriptor_downloads(source, purpose,
downloadable, i, i+n_per_request,
pds_flags);
}
last_descriptor_download_attempted = now;
int i, n_per_request, max_dl_per_req;
const char *req_plural = "", *rtr_plural = "";
int pds_flags = PDS_RETRY_IF_NO_SERVERS;
if (!authdir_mode_any_nonhidserv(options) || fetch_microdesc) {
/* If we wind up going to the authorities, we want to only open one
* connection to each authority at a time, so that we don't overload
* them. We do this by setting PDS_NO_EXISTING_SERVERDESC_FETCH
* regardless of whether we're a cache or not.
*
* Setting this flag can make initiate_descriptor_downloads() ignore
* requests. We need to make sure that we do in fact call
* update_router_descriptor_downloads() later on, once the connections
* have succeeded or failed.
*/
pds_flags |= fetch_microdesc ?
PDS_NO_EXISTING_MICRODESC_FETCH :
PDS_NO_EXISTING_SERVERDESC_FETCH;
}
n_per_request = CEIL_DIV(n_downloadable, MIN_REQUESTS);
max_dl_per_req = max_dl_per_request(options, purpose);
if (n_per_request > max_dl_per_req)
n_per_request = max_dl_per_req;
if (n_per_request < MIN_DL_PER_REQUEST)
n_per_request = MIN_DL_PER_REQUEST;
if (n_downloadable > n_per_request)
req_plural = rtr_plural = "s";
else if (n_downloadable > 1)
rtr_plural = "s";
log_info(LD_DIR,
"Launching %d request%s for %d %s%s, %d at a time",
CEIL_DIV(n_downloadable, n_per_request), req_plural,
n_downloadable, descname, rtr_plural, n_per_request);
smartlist_sort_digests(downloadable);
for (i=0; i < n_downloadable; i += n_per_request) {
initiate_descriptor_downloads(source, purpose,
downloadable, i, i+n_per_request,
pds_flags);
}
last_descriptor_download_attempted = now;
}
/** For any descriptor that we want that's currently listed in
@ -4698,9 +4703,10 @@ update_extrainfo_downloads(time_t now)
n_no_ei, n_have, n_delay, n_pending, smartlist_len(wanted));
smartlist_shuffle(wanted);
for (i = 0; i < smartlist_len(wanted); i += MAX_DL_PER_REQUEST) {
int max_dl_per_req = max_dl_per_request(options, DIR_PURPOSE_FETCH_EXTRAINFO);
for (i = 0; i < smartlist_len(wanted); i += max_dl_per_req) {
initiate_descriptor_downloads(NULL, DIR_PURPOSE_FETCH_EXTRAINFO,
wanted, i, i + MAX_DL_PER_REQUEST,
wanted, i, i+max_dl_per_req,
PDS_RETRY_IF_NO_SERVERS|PDS_NO_EXISTING_SERVERDESC_FETCH);
}