diff options
Diffstat (limited to 'third_party/nix/src/libstore/nar-info-disk-cache.cc')
| -rw-r--r-- | third_party/nix/src/libstore/nar-info-disk-cache.cc | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/third_party/nix/src/libstore/nar-info-disk-cache.cc b/third_party/nix/src/libstore/nar-info-disk-cache.cc new file mode 100644 index 0000000000..32ad7f2b27 --- /dev/null +++ b/third_party/nix/src/libstore/nar-info-disk-cache.cc @@ -0,0 +1,267 @@ +#include "nar-info-disk-cache.hh" +#include "sync.hh" +#include "sqlite.hh" +#include "globals.hh" + +#include <sqlite3.h> + +namespace nix { + +static const char * schema = R"sql( + +create table if not exists BinaryCaches ( + id integer primary key autoincrement not null, + url text unique not null, + timestamp integer not null, + storeDir text not null, + wantMassQuery integer not null, + priority integer not null +); + +create table if not exists NARs ( + cache integer not null, + hashPart text not null, + namePart text, + url text, + compression text, + fileHash text, + fileSize integer, + narHash text, + narSize integer, + refs text, + deriver text, + sigs text, + ca text, + timestamp integer not null, + present integer not null, + primary key (cache, hashPart), + foreign key (cache) references BinaryCaches(id) on delete cascade +); + +create table if not exists LastPurge ( + dummy text primary key, + value integer +); + +)sql"; + +class NarInfoDiskCacheImpl : public NarInfoDiskCache +{ +public: + + /* How often to purge expired entries from the cache. */ + const int purgeInterval = 24 * 3600; + + struct Cache + { + int id; + Path storeDir; + bool wantMassQuery; + int priority; + }; + + struct State + { + SQLite db; + SQLiteStmt insertCache, queryCache, insertNAR, insertMissingNAR, queryNAR, purgeCache; + std::map<std::string, Cache> caches; + }; + + Sync<State> _state; + + NarInfoDiskCacheImpl() + { + auto state(_state.lock()); + + Path dbPath = getCacheDir() + "/nix/binary-cache-v6.sqlite"; + createDirs(dirOf(dbPath)); + + state->db = SQLite(dbPath); + + if (sqlite3_busy_timeout(state->db, 60 * 60 * 1000) != SQLITE_OK) + throwSQLiteError(state->db, "setting timeout"); + + // We can always reproduce the cache. + state->db.exec("pragma synchronous = off"); + state->db.exec("pragma main.journal_mode = truncate"); + + state->db.exec(schema); + + state->insertCache.create(state->db, + "insert or replace into BinaryCaches(url, timestamp, storeDir, wantMassQuery, priority) values (?, ?, ?, ?, ?)"); + + state->queryCache.create(state->db, + "select id, storeDir, wantMassQuery, priority from BinaryCaches where url = ?"); + + state->insertNAR.create(state->db, + "insert or replace into NARs(cache, hashPart, namePart, url, compression, fileHash, fileSize, narHash, " + "narSize, refs, deriver, sigs, ca, timestamp, present) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 1)"); + + state->insertMissingNAR.create(state->db, + "insert or replace into NARs(cache, hashPart, timestamp, present) values (?, ?, ?, 0)"); + + state->queryNAR.create(state->db, + "select present, namePart, url, compression, fileHash, fileSize, narHash, narSize, refs, deriver, sigs, ca from NARs where cache = ? and hashPart = ? and ((present = 0 and timestamp > ?) or (present = 1 and timestamp > ?))"); + + /* Periodically purge expired entries from the database. */ + retrySQLite<void>([&]() { + auto now = time(0); + + SQLiteStmt queryLastPurge(state->db, "select value from LastPurge"); + auto queryLastPurge_(queryLastPurge.use()); + + if (!queryLastPurge_.next() || queryLastPurge_.getInt(0) < now - purgeInterval) { + SQLiteStmt(state->db, + "delete from NARs where ((present = 0 and timestamp < ?) or (present = 1 and timestamp < ?))") + .use() + (now - settings.ttlNegativeNarInfoCache) + (now - settings.ttlPositiveNarInfoCache) + .exec(); + + debug("deleted %d entries from the NAR info disk cache", sqlite3_changes(state->db)); + + SQLiteStmt(state->db, + "insert or replace into LastPurge(dummy, value) values ('', ?)") + .use()(now).exec(); + } + }); + } + + Cache & getCache(State & state, const std::string & uri) + { + auto i = state.caches.find(uri); + if (i == state.caches.end()) abort(); + return i->second; + } + + void createCache(const std::string & uri, const Path & storeDir, bool wantMassQuery, int priority) override + { + retrySQLite<void>([&]() { + auto state(_state.lock()); + + // FIXME: race + + state->insertCache.use()(uri)(time(0))(storeDir)(wantMassQuery)(priority).exec(); + assert(sqlite3_changes(state->db) == 1); + state->caches[uri] = Cache{(int) sqlite3_last_insert_rowid(state->db), storeDir, wantMassQuery, priority}; + }); + } + + bool cacheExists(const std::string & uri, + bool & wantMassQuery, int & priority) override + { + return retrySQLite<bool>([&]() { + auto state(_state.lock()); + + auto i = state->caches.find(uri); + if (i == state->caches.end()) { + auto queryCache(state->queryCache.use()(uri)); + if (!queryCache.next()) return false; + state->caches.emplace(uri, + Cache{(int) queryCache.getInt(0), queryCache.getStr(1), queryCache.getInt(2) != 0, (int) queryCache.getInt(3)}); + } + + auto & cache(getCache(*state, uri)); + + wantMassQuery = cache.wantMassQuery; + priority = cache.priority; + + return true; + }); + } + + std::pair<Outcome, std::shared_ptr<NarInfo>> lookupNarInfo( + const std::string & uri, const std::string & hashPart) override + { + return retrySQLite<std::pair<Outcome, std::shared_ptr<NarInfo>>>( + [&]() -> std::pair<Outcome, std::shared_ptr<NarInfo>> { + auto state(_state.lock()); + + auto & cache(getCache(*state, uri)); + + auto now = time(0); + + auto queryNAR(state->queryNAR.use() + (cache.id) + (hashPart) + (now - settings.ttlNegativeNarInfoCache) + (now - settings.ttlPositiveNarInfoCache)); + + if (!queryNAR.next()) + return {oUnknown, 0}; + + if (!queryNAR.getInt(0)) + return {oInvalid, 0}; + + auto narInfo = make_ref<NarInfo>(); + + auto namePart = queryNAR.getStr(1); + narInfo->path = cache.storeDir + "/" + + hashPart + (namePart.empty() ? "" : "-" + namePart); + narInfo->url = queryNAR.getStr(2); + narInfo->compression = queryNAR.getStr(3); + if (!queryNAR.isNull(4)) + narInfo->fileHash = Hash(queryNAR.getStr(4)); + narInfo->fileSize = queryNAR.getInt(5); + narInfo->narHash = Hash(queryNAR.getStr(6)); + narInfo->narSize = queryNAR.getInt(7); + for (auto & r : tokenizeString<Strings>(queryNAR.getStr(8), " ")) + narInfo->references.insert(cache.storeDir + "/" + r); + if (!queryNAR.isNull(9)) + narInfo->deriver = cache.storeDir + "/" + queryNAR.getStr(9); + for (auto & sig : tokenizeString<Strings>(queryNAR.getStr(10), " ")) + narInfo->sigs.insert(sig); + narInfo->ca = queryNAR.getStr(11); + + return {oValid, narInfo}; + }); + } + + void upsertNarInfo( + const std::string & uri, const std::string & hashPart, + std::shared_ptr<ValidPathInfo> info) override + { + retrySQLite<void>([&]() { + auto state(_state.lock()); + + auto & cache(getCache(*state, uri)); + + if (info) { + + auto narInfo = std::dynamic_pointer_cast<NarInfo>(info); + + assert(hashPart == storePathToHash(info->path)); + + state->insertNAR.use() + (cache.id) + (hashPart) + (storePathToName(info->path)) + (narInfo ? narInfo->url : "", narInfo != 0) + (narInfo ? narInfo->compression : "", narInfo != 0) + (narInfo && narInfo->fileHash ? narInfo->fileHash.to_string() : "", narInfo && narInfo->fileHash) + (narInfo ? narInfo->fileSize : 0, narInfo != 0 && narInfo->fileSize) + (info->narHash.to_string()) + (info->narSize) + (concatStringsSep(" ", info->shortRefs())) + (info->deriver != "" ? baseNameOf(info->deriver) : "", info->deriver != "") + (concatStringsSep(" ", info->sigs)) + (info->ca) + (time(0)).exec(); + + } else { + state->insertMissingNAR.use() + (cache.id) + (hashPart) + (time(0)).exec(); + } + }); + } +}; + +ref<NarInfoDiskCache> getNarInfoDiskCache() +{ + static ref<NarInfoDiskCache> cache = make_ref<NarInfoDiskCacheImpl>(); + return cache; +} + +} |