337 lines
10 KiB
C++
337 lines
10 KiB
C++
#include "archive.hh"
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#include "binary-cache-store.hh"
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#include "compression.hh"
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#include "derivations.hh"
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#include "fs-accessor.hh"
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#include "globals.hh"
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#include "nar-info.hh"
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#include "sync.hh"
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#include "remote-fs-accessor.hh"
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#include "nar-info-disk-cache.hh"
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#include "nar-accessor.hh"
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#include "json.hh"
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#include <chrono>
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#include <future>
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namespace nix {
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BinaryCacheStore::BinaryCacheStore(const Params & params)
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: Store(params)
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{
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if (secretKeyFile != "")
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secretKey = std::unique_ptr<SecretKey>(new SecretKey(readFile(secretKeyFile)));
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StringSink sink;
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sink << narVersionMagic1;
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narMagic = *sink.s;
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}
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void BinaryCacheStore::init()
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{
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std::string cacheInfoFile = "nix-cache-info";
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auto cacheInfo = getFile(cacheInfoFile);
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if (!cacheInfo) {
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upsertFile(cacheInfoFile, "StoreDir: " + storeDir + "\n", "text/x-nix-cache-info");
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} else {
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for (auto & line : tokenizeString<Strings>(*cacheInfo, "\n")) {
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size_t colon = line.find(':');
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if (colon == std::string::npos) continue;
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auto name = line.substr(0, colon);
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auto value = trim(line.substr(colon + 1, std::string::npos));
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if (name == "StoreDir") {
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if (value != storeDir)
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throw Error(format("binary cache '%s' is for Nix stores with prefix '%s', not '%s'")
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% getUri() % value % storeDir);
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} else if (name == "WantMassQuery") {
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wantMassQuery_ = value == "1";
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} else if (name == "Priority") {
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string2Int(value, priority);
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}
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}
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}
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}
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std::shared_ptr<std::string> BinaryCacheStore::getFile(const std::string & path)
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{
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std::promise<std::shared_ptr<std::string>> promise;
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getFile(path,
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[&](std::shared_ptr<std::string> result) {
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promise.set_value(result);
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},
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[&](std::exception_ptr exc) {
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promise.set_exception(exc);
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});
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return promise.get_future().get();
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}
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Path BinaryCacheStore::narInfoFileFor(const Path & storePath)
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{
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assertStorePath(storePath);
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return storePathToHash(storePath) + ".narinfo";
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}
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void BinaryCacheStore::writeNarInfo(ref<NarInfo> narInfo)
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{
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auto narInfoFile = narInfoFileFor(narInfo->path);
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upsertFile(narInfoFile, narInfo->to_string(), "text/x-nix-narinfo");
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auto hashPart = storePathToHash(narInfo->path);
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{
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auto state_(state.lock());
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state_->pathInfoCache.upsert(hashPart, std::shared_ptr<NarInfo>(narInfo));
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}
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if (diskCache)
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diskCache->upsertNarInfo(getUri(), hashPart, std::shared_ptr<NarInfo>(narInfo));
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}
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void BinaryCacheStore::addToStore(const ValidPathInfo & info, const ref<std::string> & nar,
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RepairFlag repair, CheckSigsFlag checkSigs, std::shared_ptr<FSAccessor> accessor)
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{
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if (!repair && isValidPath(info.path)) return;
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/* Verify that all references are valid. This may do some .narinfo
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reads, but typically they'll already be cached. */
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for (auto & ref : info.references)
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try {
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if (ref != info.path)
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queryPathInfo(ref);
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} catch (InvalidPath &) {
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throw Error(format("cannot add '%s' to the binary cache because the reference '%s' is not valid")
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% info.path % ref);
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}
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assert(nar->compare(0, narMagic.size(), narMagic) == 0);
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auto narInfo = make_ref<NarInfo>(info);
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narInfo->narSize = nar->size();
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narInfo->narHash = hashString(htSHA256, *nar);
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if (info.narHash && info.narHash != narInfo->narHash)
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throw Error(format("refusing to copy corrupted path '%1%' to binary cache") % info.path);
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auto accessor_ = std::dynamic_pointer_cast<RemoteFSAccessor>(accessor);
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/* Optionally write a JSON file containing a listing of the
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contents of the NAR. */
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if (writeNARListing) {
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std::ostringstream jsonOut;
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{
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JSONObject jsonRoot(jsonOut);
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jsonRoot.attr("version", 1);
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auto narAccessor = makeNarAccessor(nar);
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if (accessor_)
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accessor_->addToCache(info.path, *nar, narAccessor);
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{
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auto res = jsonRoot.placeholder("root");
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listNar(res, narAccessor, "", true);
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}
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}
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upsertFile(storePathToHash(info.path) + ".ls", jsonOut.str(), "application/json");
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}
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else {
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if (accessor_)
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accessor_->addToCache(info.path, *nar, makeNarAccessor(nar));
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}
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/* Compress the NAR. */
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narInfo->compression = compression;
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auto now1 = std::chrono::steady_clock::now();
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auto narCompressed = compress(compression, *nar, settings.parallelCompression);
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auto now2 = std::chrono::steady_clock::now();
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narInfo->fileHash = hashString(htSHA256, *narCompressed);
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narInfo->fileSize = narCompressed->size();
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auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1).count();
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printMsg(lvlTalkative, format("copying path '%1%' (%2% bytes, compressed %3$.1f%% in %4% ms) to binary cache")
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% narInfo->path % narInfo->narSize
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% ((1.0 - (double) narCompressed->size() / nar->size()) * 100.0)
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% duration);
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/* Atomically write the NAR file. */
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narInfo->url = "nar/" + narInfo->fileHash.to_string(Base32, false) + ".nar"
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+ (compression == "xz" ? ".xz" :
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compression == "bzip2" ? ".bz2" :
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compression == "br" ? ".br" :
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"");
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if (repair || !fileExists(narInfo->url)) {
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stats.narWrite++;
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upsertFile(narInfo->url, *narCompressed, "application/x-nix-nar");
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} else
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stats.narWriteAverted++;
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stats.narWriteBytes += nar->size();
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stats.narWriteCompressedBytes += narCompressed->size();
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stats.narWriteCompressionTimeMs += duration;
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/* Atomically write the NAR info file.*/
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if (secretKey) narInfo->sign(*secretKey);
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writeNarInfo(narInfo);
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stats.narInfoWrite++;
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}
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bool BinaryCacheStore::isValidPathUncached(const Path & storePath)
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{
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// FIXME: this only checks whether a .narinfo with a matching hash
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// part exists. So ‘f4kb...-foo’ matches ‘f4kb...-bar’, even
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// though they shouldn't. Not easily fixed.
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return fileExists(narInfoFileFor(storePath));
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}
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void BinaryCacheStore::narFromPath(const Path & storePath, Sink & sink)
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{
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auto info = queryPathInfo(storePath).cast<const NarInfo>();
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auto nar = getFile(info->url);
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if (!nar) throw Error(format("file '%s' missing from binary cache") % info->url);
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stats.narRead++;
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stats.narReadCompressedBytes += nar->size();
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/* Decompress the NAR. FIXME: would be nice to have the remote
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side do this. */
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try {
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nar = decompress(info->compression, *nar);
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} catch (UnknownCompressionMethod &) {
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throw Error(format("binary cache path '%s' uses unknown compression method '%s'")
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% storePath % info->compression);
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}
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stats.narReadBytes += nar->size();
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printMsg(lvlTalkative, format("exporting path '%1%' (%2% bytes)") % storePath % nar->size());
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assert(nar->size() % 8 == 0);
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sink((unsigned char *) nar->c_str(), nar->size());
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}
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void BinaryCacheStore::queryPathInfoUncached(const Path & storePath,
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std::function<void(std::shared_ptr<ValidPathInfo>)> success,
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std::function<void(std::exception_ptr exc)> failure)
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{
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auto uri = getUri();
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auto act = std::make_shared<Activity>(*logger, lvlTalkative, actQueryPathInfo,
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fmt("querying info about '%s' on '%s'", storePath, uri), Logger::Fields{storePath, uri});
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PushActivity pact(act->id);
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auto narInfoFile = narInfoFileFor(storePath);
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getFile(narInfoFile,
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[=](std::shared_ptr<std::string> data) {
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if (!data) return success(0);
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stats.narInfoRead++;
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callSuccess(success, failure, (std::shared_ptr<ValidPathInfo>)
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std::make_shared<NarInfo>(*this, *data, narInfoFile));
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(void) act; // force Activity into this lambda to ensure it stays alive
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},
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failure);
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}
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Path BinaryCacheStore::addToStore(const string & name, const Path & srcPath,
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bool recursive, HashType hashAlgo, PathFilter & filter, RepairFlag repair)
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{
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// FIXME: some cut&paste from LocalStore::addToStore().
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/* Read the whole path into memory. This is not a very scalable
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method for very large paths, but `copyPath' is mainly used for
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small files. */
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StringSink sink;
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Hash h;
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if (recursive) {
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dumpPath(srcPath, sink, filter);
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h = hashString(hashAlgo, *sink.s);
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} else {
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auto s = readFile(srcPath);
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dumpString(s, sink);
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h = hashString(hashAlgo, s);
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}
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ValidPathInfo info;
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info.path = makeFixedOutputPath(recursive, h, name);
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addToStore(info, sink.s, repair, CheckSigs, nullptr);
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return info.path;
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}
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Path BinaryCacheStore::addTextToStore(const string & name, const string & s,
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const PathSet & references, RepairFlag repair)
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{
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ValidPathInfo info;
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info.path = computeStorePathForText(name, s, references);
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info.references = references;
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if (repair || !isValidPath(info.path)) {
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StringSink sink;
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dumpString(s, sink);
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addToStore(info, sink.s, repair, CheckSigs, nullptr);
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}
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return info.path;
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}
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ref<FSAccessor> BinaryCacheStore::getFSAccessor()
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{
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return make_ref<RemoteFSAccessor>(ref<Store>(shared_from_this()), localNarCache);
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}
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void BinaryCacheStore::addSignatures(const Path & storePath, const StringSet & sigs)
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{
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/* Note: this is inherently racy since there is no locking on
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binary caches. In particular, with S3 this unreliable, even
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when addSignatures() is called sequentially on a path, because
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S3 might return an outdated cached version. */
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auto narInfo = make_ref<NarInfo>((NarInfo &) *queryPathInfo(storePath));
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narInfo->sigs.insert(sigs.begin(), sigs.end());
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auto narInfoFile = narInfoFileFor(narInfo->path);
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writeNarInfo(narInfo);
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}
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std::shared_ptr<std::string> BinaryCacheStore::getBuildLog(const Path & path)
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{
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Path drvPath;
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if (isDerivation(path))
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drvPath = path;
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else {
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try {
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auto info = queryPathInfo(path);
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// FIXME: add a "Log" field to .narinfo
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if (info->deriver == "") return nullptr;
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drvPath = info->deriver;
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} catch (InvalidPath &) {
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return nullptr;
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}
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}
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auto logPath = "log/" + baseNameOf(drvPath);
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debug("fetching build log from binary cache '%s/%s'", getUri(), logPath);
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return getFile(logPath);
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}
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}
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