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Teach consdiffmgr to remember two digests: one compressed, one not.

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This commit is contained in:
Nick Mathewson 2017-04-25 13:06:08 -04:00
parent 0274ea749a
commit 9e081a44a9
1 changed files with 31 additions and 16 deletions
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47
src/or/consdiffmgr.c
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@ -21,8 +21,6 @@
#include "networkstatus.h"
#include "workqueue.h"
/* XXXX support compression */
/**
* Labels to apply to items in the conscache object.
*
@ -33,8 +31,10 @@
/* The valid-after time for a consensus (or for the target consensus of a
* diff), encoded as ISO UTC. */
#define LABEL_VALID_AFTER "consensus-valid-after"
/* A hex encoded SHA3 digest of the object after decompression. */
/* A hex encoded SHA3 digest of the object, as compressed (if any) */
#define LABEL_SHA3_DIGEST "sha3-digest"
/* A hex encoded SHA3 digest of the object before compression. */
#define LABEL_SHA3_DIGEST_UNCOMPRESSED "sha3-digest-uncompressed"
/* The flavor of the consensus or consensuses diff */
#define LABEL_FLAVOR "consensus-flavor"
/* Diff only: the SHA3 digest of the source consensus. */
@ -43,6 +43,8 @@
#define LABEL_TARGET_SHA3_DIGEST "target-sha3-digest"
/* Diff only: the valid-after date of the source consensus. */
#define LABEL_FROM_VALID_AFTER "from-valid-after"
/* What kind of compression was used? */
#define LABEL_COMPRESSION_TYPE "compression"
/** @} */
#define DOCTYPE_CONSENSUS "consensus"
@ -299,10 +301,11 @@ cdm_cache_get(void)
/**
* Helper: given a list of labels, prepend the hex-encoded SHA3 digest
* of the <b>bodylen</b>-byte object at <b>body</b> to those labels,
* with LABEL_SHA3_DIGEST as its label.
* with <b>label</b> as its label.
*/
static void
cdm_labels_prepend_sha3(config_line_t **labels,
const char *label,
const uint8_t *body,
size_t bodylen)
{
@ -313,7 +316,7 @@ cdm_labels_prepend_sha3(config_line_t **labels,
base16_encode(hexdigest, sizeof(hexdigest),
(const char *)sha3_digest, sizeof(sha3_digest));
config_line_prepend(labels, LABEL_SHA3_DIGEST, hexdigest);
config_line_prepend(labels, label, hexdigest);
}
/** Helper: if there is a sha3-256 hex-encoded digest in <b>ent</b> with the
@ -417,7 +420,10 @@ consdiffmgr_add_consensus(const char *consensus,
format_iso_time_nospace(formatted_time, valid_after);
const char *flavname = networkstatus_get_flavor_name(flavor);
cdm_labels_prepend_sha3(&labels, (const uint8_t *)consensus, bodylen);
cdm_labels_prepend_sha3(&labels, LABEL_SHA3_DIGEST,
(const uint8_t *)consensus, bodylen);
cdm_labels_prepend_sha3(&labels, LABEL_SHA3_DIGEST_UNCOMPRESSED,
(const uint8_t *)consensus, bodylen);
config_line_prepend(&labels, LABEL_FLAVOR, flavname);
config_line_prepend(&labels, LABEL_VALID_AFTER, formatted_time);
config_line_prepend(&labels, LABEL_DOCTYPE, DOCTYPE_CONSENSUS);
@ -584,7 +590,8 @@ consdiffmgr_cleanup(void)
if (most_recent == NULL)
continue;
const char *most_recent_sha3 =
consensus_cache_entry_get_value(most_recent, LABEL_SHA3_DIGEST);
consensus_cache_entry_get_value(most_recent,
LABEL_SHA3_DIGEST_UNCOMPRESSED);
if (BUG(most_recent_sha3 == NULL))
continue; // LCOV_EXCL_LINE
@ -713,7 +720,7 @@ consdiffmgr_rescan_flavor_(consensus_flavor_t flavor)
goto done; //LCOV_EXCL_LINE
uint8_t most_recent_sha3[DIGEST256_LEN];
if (BUG(cdm_entry_get_sha3_value(most_recent_sha3, most_recent,
LABEL_SHA3_DIGEST) < 0))
LABEL_SHA3_DIGEST_UNCOMPRESSED) < 0))
goto done; //LCOV_EXCL_LINE
// 2. Find all the relevant diffs _to_ this consensus. These are ones
@ -765,7 +772,8 @@ consdiffmgr_rescan_flavor_(consensus_flavor_t flavor)
continue; // LCOV_EXCL_LINE
uint8_t this_sha3[DIGEST256_LEN];
if (BUG(cdm_entry_get_sha3_value(this_sha3, c, LABEL_SHA3_DIGEST)<0))
if (BUG(cdm_entry_get_sha3_value(this_sha3, c,
LABEL_SHA3_DIGEST_UNCOMPRESSED)<0))
continue; // LCOV_EXCL_LINE
if (cdm_diff_ht_check_and_note_pending(flavor,
this_sha3, most_recent_sha3)) {
@ -933,13 +941,15 @@ consensus_diff_worker_threadfn(void *state_, void *work_)
const char *lv_from_valid_after =
consensus_cache_entry_get_value(job->diff_from, LABEL_VALID_AFTER);
const char *lv_from_digest =
consensus_cache_entry_get_value(job->diff_from, LABEL_SHA3_DIGEST);
consensus_cache_entry_get_value(job->diff_from,
LABEL_SHA3_DIGEST_UNCOMPRESSED);
const char *lv_from_flavor =
consensus_cache_entry_get_value(job->diff_from, LABEL_FLAVOR);
const char *lv_to_flavor =
consensus_cache_entry_get_value(job->diff_to, LABEL_FLAVOR);
const char *lv_to_digest =
consensus_cache_entry_get_value(job->diff_to, LABEL_SHA3_DIGEST);
consensus_cache_entry_get_value(job->diff_to,
LABEL_SHA3_DIGEST_UNCOMPRESSED);
/* All these values are mandatory on the input */
if (BUG(!lv_to_valid_after) ||
@ -978,7 +988,10 @@ consensus_diff_worker_threadfn(void *state_, void *work_)
job->body_out = (uint8_t *) consensus_diff;
job->bodylen_out = strlen(consensus_diff);
cdm_labels_prepend_sha3(&job->labels_out, job->body_out, job->bodylen_out);
cdm_labels_prepend_sha3(&job->labels_out, LABEL_SHA3_DIGEST,
job->body_out, job->bodylen_out);
cdm_labels_prepend_sha3(&job->labels_out, LABEL_SHA3_DIGEST_UNCOMPRESSED,
job->body_out, job->bodylen_out);
config_line_prepend(&job->labels_out, LABEL_FROM_VALID_AFTER,
lv_from_valid_after);
config_line_prepend(&job->labels_out, LABEL_VALID_AFTER, lv_to_valid_after);
@ -1020,9 +1033,11 @@ consensus_diff_worker_replyfn(void *work_)
consensus_diff_worker_job_t *job = work_;
const char *lv_from_digest =
consensus_cache_entry_get_value(job->diff_from, LABEL_SHA3_DIGEST);
consensus_cache_entry_get_value(job->diff_from,
LABEL_SHA3_DIGEST_UNCOMPRESSED);
const char *lv_to_digest =
consensus_cache_entry_get_value(job->diff_to, LABEL_SHA3_DIGEST);
consensus_cache_entry_get_value(job->diff_to,
LABEL_SHA3_DIGEST_UNCOMPRESSED);
const char *lv_flavor =
consensus_cache_entry_get_value(job->diff_to, LABEL_FLAVOR);
if (BUG(lv_from_digest == NULL))
@ -1035,10 +1050,10 @@ consensus_diff_worker_replyfn(void *work_)
int flav = -1;
int cache = 1;
if (BUG(cdm_entry_get_sha3_value(from_sha3, job->diff_from,
LABEL_SHA3_DIGEST) < 0))
LABEL_SHA3_DIGEST_UNCOMPRESSED) < 0))
cache = 0;
if (BUG(cdm_entry_get_sha3_value(to_sha3, job->diff_to,
LABEL_SHA3_DIGEST) < 0))
LABEL_SHA3_DIGEST_UNCOMPRESSED) < 0))
cache = 0;
if (BUG(lv_flavor == NULL)) {
cache = 0;