forked from lix-project/lix
487 lines
15 KiB
C++
487 lines
15 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 "thread-pool.hh"
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#include "callback.hh"
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#include <chrono>
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#include <future>
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#include <regex>
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#include <fstream>
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#include <nlohmann/json.hpp>
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namespace nix {
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BinaryCacheStore::BinaryCacheStore(const Params & params)
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: BinaryCacheStoreConfig(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("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.setDefault(value == "1" ? "true" : "false");
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} else if (name == "Priority") {
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priority.setDefault(fmt("%d", std::stoi(value)));
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}
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}
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}
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}
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void BinaryCacheStore::upsertFile(const std::string & path,
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std::string && data,
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const std::string & mimeType)
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{
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upsertFile(path, std::make_shared<std::stringstream>(std::move(data)), mimeType);
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}
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void BinaryCacheStore::getFile(const std::string & path,
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Callback<std::shared_ptr<std::string>> callback) noexcept
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{
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try {
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callback(getFile(path));
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} catch (...) { callback.rethrow(); }
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}
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void BinaryCacheStore::getFile(const std::string & path, Sink & sink)
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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::future<std::shared_ptr<std::string>> result) {
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try {
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promise.set_value(result.get());
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} catch (...) {
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promise.set_exception(std::current_exception());
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}
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}});
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sink(*promise.get_future().get());
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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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StringSink sink;
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try {
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getFile(path, sink);
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} catch (NoSuchBinaryCacheFile &) {
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return nullptr;
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}
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return sink.s;
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}
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std::string BinaryCacheStore::narInfoFileFor(const StorePath & storePath)
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{
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return std::string(storePath.hashPart()) + ".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(*this), "text/x-nix-narinfo");
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std::string hashPart(narInfo->path.hashPart());
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{
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auto state_(state.lock());
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state_->pathInfoCache.upsert(hashPart, PathInfoCacheValue { .value = 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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AutoCloseFD openFile(const Path & path)
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{
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auto fd = open(path.c_str(), O_RDONLY | O_CLOEXEC);
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if (!fd)
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throw SysError("opening file '%1%'", path);
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return fd;
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}
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struct FileSource : FdSource
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{
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AutoCloseFD fd2;
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FileSource(const Path & path)
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: fd2(openFile(path))
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{
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fd = fd2.get();
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}
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};
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ref<const ValidPathInfo> BinaryCacheStore::addToStoreCommon(
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Source & narSource, RepairFlag repair, CheckSigsFlag checkSigs,
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std::function<ValidPathInfo(HashResult)> mkInfo)
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{
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auto [fdTemp, fnTemp] = createTempFile();
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AutoDelete autoDelete(fnTemp);
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auto now1 = std::chrono::steady_clock::now();
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/* Read the NAR simultaneously into a CompressionSink+FileSink (to
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write the compressed NAR to disk), into a HashSink (to get the
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NAR hash), and into a NarAccessor (to get the NAR listing). */
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HashSink fileHashSink { htSHA256 };
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std::shared_ptr<FSAccessor> narAccessor;
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HashSink narHashSink { htSHA256 };
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{
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FdSink fileSink(fdTemp.get());
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TeeSink teeSinkCompressed { fileSink, fileHashSink };
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auto compressionSink = makeCompressionSink(compression, teeSinkCompressed);
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TeeSink teeSinkUncompressed { *compressionSink, narHashSink };
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TeeSource teeSource { narSource, teeSinkUncompressed };
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narAccessor = makeNarAccessor(teeSource);
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compressionSink->finish();
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fileSink.flush();
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}
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auto now2 = std::chrono::steady_clock::now();
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auto info = mkInfo(narHashSink.finish());
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auto narInfo = make_ref<NarInfo>(info);
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narInfo->compression = compression;
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auto [fileHash, fileSize] = fileHashSink.finish();
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narInfo->fileHash = fileHash;
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narInfo->fileSize = fileSize;
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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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auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1).count();
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printMsg(lvlTalkative, "copying path '%1%' (%2% bytes, compressed %3$.1f%% in %4% ms) to binary cache",
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printStorePath(narInfo->path), info.narSize,
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((1.0 - (double) fileSize / info.narSize) * 100.0),
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duration);
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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("cannot add '%s' to the binary cache because the reference '%s' is not valid",
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printStorePath(info.path), printStorePath(ref));
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}
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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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{
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auto res = jsonRoot.placeholder("root");
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listNar(res, ref<FSAccessor>(narAccessor), "", true);
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}
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}
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upsertFile(std::string(info.path.hashPart()) + ".ls", jsonOut.str(), "application/json");
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}
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/* Optionally maintain an index of DWARF debug info files
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consisting of JSON files named 'debuginfo/<build-id>' that
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specify the NAR file and member containing the debug info. */
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if (writeDebugInfo) {
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std::string buildIdDir = "/lib/debug/.build-id";
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if (narAccessor->stat(buildIdDir).type == FSAccessor::tDirectory) {
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ThreadPool threadPool(25);
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auto doFile = [&](std::string member, std::string key, std::string target) {
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checkInterrupt();
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nlohmann::json json;
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json["archive"] = target;
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json["member"] = member;
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// FIXME: or should we overwrite? The previous link may point
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// to a GC'ed file, so overwriting might be useful...
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if (fileExists(key)) return;
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printMsg(lvlTalkative, "creating debuginfo link from '%s' to '%s'", key, target);
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upsertFile(key, json.dump(), "application/json");
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};
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std::regex regex1("^[0-9a-f]{2}$");
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std::regex regex2("^[0-9a-f]{38}\\.debug$");
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for (auto & s1 : narAccessor->readDirectory(buildIdDir)) {
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auto dir = buildIdDir + "/" + s1;
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if (narAccessor->stat(dir).type != FSAccessor::tDirectory
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|| !std::regex_match(s1, regex1))
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continue;
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for (auto & s2 : narAccessor->readDirectory(dir)) {
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auto debugPath = dir + "/" + s2;
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if (narAccessor->stat(debugPath).type != FSAccessor::tRegular
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|| !std::regex_match(s2, regex2))
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continue;
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auto buildId = s1 + s2;
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std::string key = "debuginfo/" + buildId;
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std::string target = "../" + narInfo->url;
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threadPool.enqueue(std::bind(doFile, std::string(debugPath, 1), key, target));
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}
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}
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threadPool.process();
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}
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}
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/* Atomically write the NAR file. */
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if (repair || !fileExists(narInfo->url)) {
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stats.narWrite++;
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upsertFile(narInfo->url,
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std::make_shared<std::fstream>(fnTemp, std::ios_base::in | std::ios_base::binary),
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"application/x-nix-nar");
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} else
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stats.narWriteAverted++;
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stats.narWriteBytes += info.narSize;
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stats.narWriteCompressedBytes += fileSize;
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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(*this, *secretKey);
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writeNarInfo(narInfo);
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stats.narInfoWrite++;
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return narInfo;
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}
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void BinaryCacheStore::addToStore(const ValidPathInfo & info, Source & narSource,
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RepairFlag repair, CheckSigsFlag checkSigs)
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{
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if (!repair && isValidPath(info.path)) {
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// FIXME: copyNAR -> null sink
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narSource.drain();
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return;
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}
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addToStoreCommon(narSource, repair, checkSigs, {[&](HashResult nar) {
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/* FIXME reinstate these, once we can correctly do hash modulo sink as
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needed. We need to throw here in case we uploaded a corrupted store path. */
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// assert(info.narHash == nar.first);
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// assert(info.narSize == nar.second);
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return info;
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}});
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}
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StorePath BinaryCacheStore::addToStoreFromDump(Source & dump, const string & name,
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FileIngestionMethod method, HashType hashAlgo, RepairFlag repair)
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{
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if (method != FileIngestionMethod::Recursive || hashAlgo != htSHA256)
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unsupported("addToStoreFromDump");
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return addToStoreCommon(dump, repair, CheckSigs, [&](HashResult nar) {
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ValidPathInfo info {
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makeFixedOutputPath(method, nar.first, name),
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nar.first,
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};
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info.narSize = nar.second;
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return info;
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})->path;
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}
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bool BinaryCacheStore::isValidPathUncached(const StorePath & 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 StorePath & storePath, Sink & sink)
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{
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auto info = queryPathInfo(storePath).cast<const NarInfo>();
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LengthSink narSize;
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TeeSink tee { sink, narSize };
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auto decompressor = makeDecompressionSink(info->compression, tee);
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try {
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getFile(info->url, *decompressor);
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} catch (NoSuchBinaryCacheFile & e) {
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throw SubstituteGone(e.info());
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}
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decompressor->finish();
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stats.narRead++;
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//stats.narReadCompressedBytes += nar->size(); // FIXME
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stats.narReadBytes += narSize.length;
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}
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void BinaryCacheStore::queryPathInfoUncached(const StorePath & storePath,
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Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept
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{
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auto uri = getUri();
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auto storePathS = printStorePath(storePath);
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auto act = std::make_shared<Activity>(*logger, lvlTalkative, actQueryPathInfo,
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fmt("querying info about '%s' on '%s'", storePathS, uri), Logger::Fields{storePathS, uri});
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PushActivity pact(act->id);
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auto narInfoFile = narInfoFileFor(storePath);
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auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
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getFile(narInfoFile,
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{[=](std::future<std::shared_ptr<std::string>> fut) {
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try {
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auto data = fut.get();
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if (!data) return (*callbackPtr)(nullptr);
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stats.narInfoRead++;
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(*callbackPtr)((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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} catch (...) {
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callbackPtr->rethrow();
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}
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}});
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}
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StorePath BinaryCacheStore::addToStore(const string & name, const Path & srcPath,
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FileIngestionMethod method, HashType hashAlgo, PathFilter & filter, RepairFlag repair)
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{
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/* FIXME: Make BinaryCacheStore::addToStoreCommon support
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non-recursive+sha256 so we can just use the default
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implementation of this method in terms of addToStoreFromDump. */
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HashSink sink { hashAlgo };
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if (method == FileIngestionMethod::Recursive) {
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dumpPath(srcPath, sink, filter);
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} else {
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readFile(srcPath, sink);
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}
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auto h = sink.finish().first;
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auto source = sinkToSource([&](Sink & sink) {
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dumpPath(srcPath, sink, filter);
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});
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return addToStoreCommon(*source, repair, CheckSigs, [&](HashResult nar) {
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ValidPathInfo info {
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makeFixedOutputPath(method, h, name),
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nar.first,
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};
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info.narSize = nar.second;
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info.ca = FixedOutputHash {
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.method = method,
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.hash = h,
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};
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return info;
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})->path;
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}
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StorePath BinaryCacheStore::addTextToStore(const string & name, const string & s,
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const StorePathSet & references, RepairFlag repair)
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{
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auto textHash = hashString(htSHA256, s);
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auto path = makeTextPath(name, textHash, references);
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if (!repair && isValidPath(path))
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return path;
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auto source = StringSource { s };
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return addToStoreCommon(source, repair, CheckSigs, [&](HashResult nar) {
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ValidPathInfo info { path, nar.first };
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info.narSize = nar.second;
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info.ca = TextHash { textHash };
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info.references = references;
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return info;
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})->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 StorePath & 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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writeNarInfo(narInfo);
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}
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std::shared_ptr<std::string> BinaryCacheStore::getBuildLog(const StorePath & path)
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{
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auto drvPath = path;
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if (!path.isDerivation()) {
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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/" + std::string(baseNameOf(printStorePath(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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