lix/src/libstore/binary-cache-store.cc

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#include "archive.hh"
#include "binary-cache-store.hh"
#include "compression.hh"
#include "derivations.hh"
#include "fs-accessor.hh"
#include "globals.hh"
#include "nar-info.hh"
#include "sync.hh"
#include "remote-fs-accessor.hh"
#include "nar-info-disk-cache.hh"
#include "nar-accessor.hh"
#include "json.hh"
#include "thread-pool.hh"
#include <chrono>
#include <future>
#include <regex>
#include <fstream>
#include <nlohmann/json.hpp>
namespace nix {
BinaryCacheStore::BinaryCacheStore(const Params & params)
: BinaryCacheStoreConfig(params)
, Store(params)
{
if (secretKeyFile != "")
secretKey = std::unique_ptr<SecretKey>(new SecretKey(readFile(secretKeyFile)));
StringSink sink;
sink << narVersionMagic1;
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narMagic = *sink.s;
}
void BinaryCacheStore::init()
{
std::string cacheInfoFile = "nix-cache-info";
auto cacheInfo = getFile(cacheInfoFile);
if (!cacheInfo) {
upsertFile(cacheInfoFile, "StoreDir: " + storeDir + "\n", "text/x-nix-cache-info");
} else {
for (auto & line : tokenizeString<Strings>(*cacheInfo, "\n")) {
size_t colon= line.find(':');
if (colon ==std::string::npos) continue;
auto name = line.substr(0, colon);
auto value = trim(line.substr(colon + 1, std::string::npos));
if (name == "StoreDir") {
if (value != storeDir)
throw Error("binary cache '%s' is for Nix stores with prefix '%s', not '%s'",
getUri(), value, storeDir);
} else if (name == "WantMassQuery") {
wantMassQuery.setDefault(value == "1" ? "true" : "false");
} else if (name == "Priority") {
priority.setDefault(fmt("%d", std::stoi(value)));
}
}
}
}
void BinaryCacheStore::upsertFile(const std::string & path,
std::string && data,
const std::string & mimeType)
{
upsertFile(path, std::make_shared<std::stringstream>(std::move(data)), mimeType);
}
void BinaryCacheStore::getFile(const std::string & path,
Callback<std::shared_ptr<std::string>> callback) noexcept
{
try {
callback(getFile(path));
} catch (...) { callback.rethrow(); }
}
void BinaryCacheStore::getFile(const std::string & path, Sink & sink)
{
std::promise<std::shared_ptr<std::string>> promise;
getFile(path,
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{[&](std::future<std::shared_ptr<std::string>> result) {
try {
promise.set_value(result.get());
} catch (...) {
promise.set_exception(std::current_exception());
}
}});
auto data = promise.get_future().get();
sink((unsigned char *) data->data(), data->size());
}
std::shared_ptr<std::string> BinaryCacheStore::getFile(const std::string & path)
{
StringSink sink;
try {
getFile(path, sink);
} catch (NoSuchBinaryCacheFile &) {
return nullptr;
}
return sink.s;
}
std::string BinaryCacheStore::narInfoFileFor(const StorePath & storePath)
{
return std::string(storePath.hashPart()) + ".narinfo";
}
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void BinaryCacheStore::writeNarInfo(ref<NarInfo> narInfo)
{
auto narInfoFile = narInfoFileFor(narInfo->path);
upsertFile(narInfoFile, narInfo->to_string(*this), "text/x-nix-narinfo");
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std::string hashPart(narInfo->path.hashPart());
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{
auto state_(state.lock());
state_->pathInfoCache.upsert(hashPart, PathInfoCacheValue { .value = std::shared_ptr<NarInfo>(narInfo) });
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}
if (diskCache)
diskCache->upsertNarInfo(getUri(), hashPart, std::shared_ptr<NarInfo>(narInfo));
}
AutoCloseFD openFile(const Path & path)
{
auto fd = open(path.c_str(), O_RDONLY | O_CLOEXEC);
if (!fd)
throw SysError("opening file '%1%'", path);
return fd;
}
struct FileSource : FdSource
{
AutoCloseFD fd2;
FileSource(const Path & path)
: fd2(openFile(path))
{
fd = fd2.get();
}
};
void BinaryCacheStore::addToStore(const ValidPathInfo & info, Source & narSource,
RepairFlag repair, CheckSigsFlag checkSigs)
{
assert(info.narSize);
if (!repair && isValidPath(info.path)) {
// FIXME: copyNAR -> null sink
narSource.drain();
return;
}
auto [fdTemp, fnTemp] = createTempFile();
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AutoDelete autoDelete(fnTemp);
auto now1 = std::chrono::steady_clock::now();
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/* Read the NAR simultaneously into a CompressionSink+FileSink (to
write the compressed NAR to disk), into a HashSink (to get the
NAR hash), and into a NarAccessor (to get the NAR listing). */
HashSink fileHashSink(htSHA256);
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std::shared_ptr<FSAccessor> narAccessor;
{
FdSink fileSink(fdTemp.get());
TeeSink teeSink(fileSink, fileHashSink);
auto compressionSink = makeCompressionSink(compression, teeSink);
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TeeSource teeSource(narSource, *compressionSink);
narAccessor = makeNarAccessor(teeSource);
compressionSink->finish();
fileSink.flush();
}
auto now2 = std::chrono::steady_clock::now();
auto narInfo = make_ref<NarInfo>(info);
narInfo->narSize = info.narSize;
narInfo->narHash = info.narHash;
narInfo->compression = compression;
auto [fileHash, fileSize] = fileHashSink.finish();
narInfo->fileHash = fileHash;
narInfo->fileSize = fileSize;
narInfo->url = "nar/" + narInfo->fileHash->to_string(Base32, false) + ".nar"
+ (compression == "xz" ? ".xz" :
compression == "bzip2" ? ".bz2" :
compression == "br" ? ".br" :
"");
auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1).count();
printMsg(lvlTalkative, "copying path '%1%' (%2% bytes, compressed %3$.1f%% in %4% ms) to binary cache",
printStorePath(narInfo->path), info.narSize,
((1.0 - (double) fileSize / info.narSize) * 100.0),
duration);
/* Verify that all references are valid. This may do some .narinfo
reads, but typically they'll already be cached. */
for (auto & ref : info.references)
try {
if (ref != info.path)
queryPathInfo(ref);
} catch (InvalidPath &) {
throw Error("cannot add '%s' to the binary cache because the reference '%s' is not valid",
printStorePath(info.path), printStorePath(ref));
}
/* Optionally write a JSON file containing a listing of the
contents of the NAR. */
if (writeNARListing) {
std::ostringstream jsonOut;
{
JSONObject jsonRoot(jsonOut);
jsonRoot.attr("version", 1);
{
auto res = jsonRoot.placeholder("root");
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listNar(res, ref<FSAccessor>(narAccessor), "", true);
}
}
upsertFile(std::string(info.path.hashPart()) + ".ls", jsonOut.str(), "application/json");
}
/* Optionally maintain an index of DWARF debug info files
consisting of JSON files named 'debuginfo/<build-id>' that
specify the NAR file and member containing the debug info. */
if (writeDebugInfo) {
std::string buildIdDir = "/lib/debug/.build-id";
if (narAccessor->stat(buildIdDir).type == FSAccessor::tDirectory) {
ThreadPool threadPool(25);
auto doFile = [&](std::string member, std::string key, std::string target) {
checkInterrupt();
nlohmann::json json;
json["archive"] = target;
json["member"] = member;
// FIXME: or should we overwrite? The previous link may point
// to a GC'ed file, so overwriting might be useful...
if (fileExists(key)) return;
printMsg(lvlTalkative, "creating debuginfo link from '%s' to '%s'", key, target);
upsertFile(key, json.dump(), "application/json");
};
std::regex regex1("^[0-9a-f]{2}$");
std::regex regex2("^[0-9a-f]{38}\\.debug$");
for (auto & s1 : narAccessor->readDirectory(buildIdDir)) {
auto dir = buildIdDir + "/" + s1;
if (narAccessor->stat(dir).type != FSAccessor::tDirectory
|| !std::regex_match(s1, regex1))
continue;
for (auto & s2 : narAccessor->readDirectory(dir)) {
auto debugPath = dir + "/" + s2;
if (narAccessor->stat(debugPath).type != FSAccessor::tRegular
|| !std::regex_match(s2, regex2))
continue;
auto buildId = s1 + s2;
std::string key = "debuginfo/" + buildId;
std::string target = "../" + narInfo->url;
threadPool.enqueue(std::bind(doFile, std::string(debugPath, 1), key, target));
}
}
threadPool.process();
}
}
/* Atomically write the NAR file. */
if (repair || !fileExists(narInfo->url)) {
stats.narWrite++;
upsertFile(narInfo->url,
std::make_shared<std::fstream>(fnTemp, std::ios_base::in | std::ios_base::binary),
"application/x-nix-nar");
} else
stats.narWriteAverted++;
stats.narWriteBytes += info.narSize;
stats.narWriteCompressedBytes += fileSize;
stats.narWriteCompressionTimeMs += duration;
/* Atomically write the NAR info file.*/
if (secretKey) narInfo->sign(*this, *secretKey);
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writeNarInfo(narInfo);
stats.narInfoWrite++;
}
bool BinaryCacheStore::isValidPathUncached(const StorePath & storePath)
{
// FIXME: this only checks whether a .narinfo with a matching hash
// part exists. So f4kb...-foo matches f4kb...-bar, even
// though they shouldn't. Not easily fixed.
return fileExists(narInfoFileFor(storePath));
}
void BinaryCacheStore::narFromPath(const StorePath & storePath, Sink & sink)
{
auto info = queryPathInfo(storePath).cast<const NarInfo>();
LengthSink narSize;
TeeSink tee { sink, narSize };
auto decompressor = makeDecompressionSink(info->compression, tee);
try {
getFile(info->url, *decompressor);
} catch (NoSuchBinaryCacheFile & e) {
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throw SubstituteGone(e.info());
}
decompressor->finish();
stats.narRead++;
//stats.narReadCompressedBytes += nar->size(); // FIXME
stats.narReadBytes += narSize.length;
}
void BinaryCacheStore::queryPathInfoUncached(const StorePath & storePath,
Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept
{
auto uri = getUri();
auto storePathS = printStorePath(storePath);
auto act = std::make_shared<Activity>(*logger, lvlTalkative, actQueryPathInfo,
fmt("querying info about '%s' on '%s'", storePathS, uri), Logger::Fields{storePathS, uri});
PushActivity pact(act->id);
auto narInfoFile = narInfoFileFor(storePath);
auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
getFile(narInfoFile,
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{[=](std::future<std::shared_ptr<std::string>> fut) {
try {
auto data = fut.get();
if (!data) return (*callbackPtr)(nullptr);
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stats.narInfoRead++;
(*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
} catch (...) {
callbackPtr->rethrow();
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}
}});
}
StorePath BinaryCacheStore::addToStore(const string & name, const Path & srcPath,
FileIngestionMethod method, HashType hashAlgo, PathFilter & filter, RepairFlag repair)
{
// FIXME: some cut&paste from LocalStore::addToStore().
/* Read the whole path into memory. This is not a very scalable
method for very large paths, but `copyPath' is mainly used for
small files. */
StringSink sink;
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std::optional<Hash> h;
if (method == FileIngestionMethod::Recursive) {
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dumpPath(srcPath, sink, filter);
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h = hashString(hashAlgo, *sink.s);
} else {
auto s = readFile(srcPath);
dumpString(s, sink);
h = hashString(hashAlgo, s);
}
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ValidPathInfo info {
makeFixedOutputPath(method, *h, name),
Hash::dummy, // Will be fixed in addToStore, which recomputes nar hash
};
auto source = StringSource { *sink.s };
addToStore(info, source, repair, CheckSigs);
return std::move(info.path);
}
StorePath BinaryCacheStore::addTextToStore(const string & name, const string & s,
const StorePathSet & references, RepairFlag repair)
{
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ValidPathInfo info {
computeStorePathForText(name, s, references),
Hash::dummy, // Will be fixed in addToStore, which recomputes nar hash
};
info.references = references;
if (repair || !isValidPath(info.path)) {
StringSink sink;
dumpString(s, sink);
auto source = StringSource { *sink.s };
addToStore(info, source, repair, CheckSigs);
}
return std::move(info.path);
}
ref<FSAccessor> BinaryCacheStore::getFSAccessor()
{
return make_ref<RemoteFSAccessor>(ref<Store>(shared_from_this()), localNarCache);
}
void BinaryCacheStore::addSignatures(const StorePath & storePath, const StringSet & sigs)
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{
/* Note: this is inherently racy since there is no locking on
binary caches. In particular, with S3 this unreliable, even
when addSignatures() is called sequentially on a path, because
S3 might return an outdated cached version. */
auto narInfo = make_ref<NarInfo>((NarInfo &) *queryPathInfo(storePath));
narInfo->sigs.insert(sigs.begin(), sigs.end());
writeNarInfo(narInfo);
}
std::shared_ptr<std::string> BinaryCacheStore::getBuildLog(const StorePath & path)
{
auto drvPath = path;
if (!path.isDerivation()) {
try {
auto info = queryPathInfo(path);
// FIXME: add a "Log" field to .narinfo
if (!info->deriver) return nullptr;
drvPath = *info->deriver;
} catch (InvalidPath &) {
return nullptr;
}
}
auto logPath = "log/" + std::string(baseNameOf(printStorePath(drvPath)));
debug("fetching build log from binary cache '%s/%s'", getUri(), logPath);
return getFile(logPath);
}
}