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-rw-r--r--src/or/config.c1
-rw-r--r--src/or/consdiffmgr.c13
-rw-r--r--src/or/or.h5
3 files changed, 18 insertions, 1 deletions
diff --git a/src/or/config.c b/src/or/config.c
index 7d2ebbdd03..a0ff0e871a 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -393,6 +393,7 @@ static config_var_t option_vars_[] = {
V(MaxAdvertisedBandwidth, MEMUNIT, "1 GB"),
V(MaxCircuitDirtiness, INTERVAL, "10 minutes"),
V(MaxClientCircuitsPending, UINT, "32"),
+ V(MaxConsensusAgeForDiffs, INTERVAL, "0 seconds"),
VAR("MaxMemInQueues", MEMUNIT, MaxMemInQueues_raw, "0"),
OBSOLETE("MaxOnionsPending"),
V(MaxOnionQueueDelay, MSEC_INTERVAL, "1750 msec"),
diff --git a/src/or/consdiffmgr.c b/src/or/consdiffmgr.c
index 638fcd6794..a3ffed10db 100644
--- a/src/or/consdiffmgr.c
+++ b/src/or/consdiffmgr.c
@@ -14,6 +14,7 @@
#define CONSDIFFMGR_PRIVATE
#include "or.h"
+#include "config.h"
#include "conscache.h"
#include "consdiff.h"
#include "consdiffmgr.h"
@@ -462,12 +463,22 @@ cdm_cache_lookup_consensus(consensus_flavor_t flavor, time_t valid_after)
static int32_t
get_max_age_to_cache(void)
{
- /* The parameter is in hours. */
const int32_t DEFAULT_MAX_AGE_TO_CACHE = 8192;
const int32_t MIN_MAX_AGE_TO_CACHE = 0;
const int32_t MAX_MAX_AGE_TO_CACHE = 8192;
const char MAX_AGE_TO_CACHE_NAME[] = "max-consensus-age-to-cache-for-diff";
+ const or_options_t *options = get_options();
+
+ if (options->MaxConsensusAgeForDiffs) {
+ const int v = options->MaxConsensusAgeForDiffs;
+ if (v >= MAX_MAX_AGE_TO_CACHE * 3600)
+ return MAX_MAX_AGE_TO_CACHE;
+ else
+ return v;
+ }
+
+ /* The parameter is in hours, so we multiply */
return 3600 * networkstatus_get_param(NULL,
MAX_AGE_TO_CACHE_NAME,
DEFAULT_MAX_AGE_TO_CACHE,
diff --git a/src/or/or.h b/src/or/or.h
index 1f55b55062..77207bc031 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -4558,6 +4558,11 @@ typedef struct {
/** Bool (default: 0): Tells if a %include was used on torrc */
int IncludeUsed;
+
+ /** The seconds after expiration which we as a relay should keep old
+ * consensuses around so that we can generate diffs from them. If 0,
+ * use the default. */
+ int MaxConsensusAgeForDiffs;
} or_options_t;
/** Persistent state for an onion router, as saved to disk. */