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nar-info-disk-cache: refresh nix-cache-info weekly

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This allows changes to nix-cache-info to be picked up by existing
clients. Previously, the only way for this to happen would be for
clients to delete binary-cache-v6.sqlite, which is quite awkward for
users.

On the other hand, updates to nix-cache-info should be pretty rare,
hence the choice of a fairly long TTL. Configurability is probably not
useful enough to warrant implementing it.
This commit is contained in:
Linus Heckemann 2022-06-22 10:49:18 -04:00
parent f6cf644e5f
commit d533a88546
1 changed files with 8 additions and 2 deletions
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10
src/libstore/nar-info-disk-cache.cc
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@ -62,6 +62,9 @@ public:
/* How often to purge expired entries from the cache. */ /* How often to purge expired entries from the cache. */
const int purgeInterval = 24 * 3600; const int purgeInterval = 24 * 3600;
/* How long to cache binary cache info (i.e. /nix-cache-info) */
const int cacheInfoTtl = 7 * 24 * 3600;
struct Cache struct Cache
{ {
int id; int id;
@ -98,7 +101,7 @@ public:
"insert or replace into BinaryCaches(url, timestamp, storeDir, wantMassQuery, priority) values (?, ?, ?, ?, ?)"); "insert or replace into BinaryCaches(url, timestamp, storeDir, wantMassQuery, priority) values (?, ?, ?, ?, ?)");
state->queryCache.create(state->db, state->queryCache.create(state->db,
"select id, storeDir, wantMassQuery, priority from BinaryCaches where url = ?"); "select id, timestamp, storeDir, wantMassQuery, priority from BinaryCaches where url = ?");
state->insertNAR.create(state->db, state->insertNAR.create(state->db,
"insert or replace into NARs(cache, hashPart, namePart, url, compression, fileHash, fileSize, narHash, " "insert or replace into NARs(cache, hashPart, namePart, url, compression, fileHash, fileSize, narHash, "
@ -186,8 +189,11 @@ public:
auto queryCache(state->queryCache.use()(uri)); auto queryCache(state->queryCache.use()(uri));
if (!queryCache.next()) if (!queryCache.next())
return std::nullopt; return std::nullopt;
if (queryCache.getInt(1) + cacheInfoTtl < time(0))
return std::nullopt;
state->caches.emplace(uri, state->caches.emplace(uri,
Cache{(int) queryCache.getInt(0), queryCache.getStr(1), queryCache.getInt(2) != 0, (int) queryCache.getInt(3)}); Cache{(int) queryCache.getInt(0), queryCache.getStr(2), queryCache.getInt(3) != 0, (int) queryCache.getInt(4)});
} }
auto & cache(getCache(*state, uri)); auto & cache(getCache(*state, uri));