lix/src/libstore/binary-cache-store.cc
John Ericson 537e8719f2
Explain various .self = false,
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
2023-04-17 09:15:11 -04:00

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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 "thread-pool.hh"
#include "callback.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;
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");
} else if (name == "Priority") {
priority.setDefault(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::optional<std::string>> callback) noexcept
{
try {
callback(getFile(path));
} catch (...) { callback.rethrow(); }
}
void BinaryCacheStore::getFile(const std::string & path, Sink & sink)
{
std::promise<std::optional<std::string>> promise;
getFile(path,
{[&](std::future<std::optional<std::string>> result) {
try {
promise.set_value(result.get());
} catch (...) {
promise.set_exception(std::current_exception());
}
}});
sink(*promise.get_future().get());
}
std::optional<std::string> BinaryCacheStore::getFile(const std::string & path)
{
StringSink sink;
try {
getFile(path, sink);
} catch (NoSuchBinaryCacheFile &) {
return std::nullopt;
}
return std::move(sink.s);
}
std::string BinaryCacheStore::narInfoFileFor(const StorePath & storePath)
{
return std::string(storePath.hashPart()) + ".narinfo";
}
void BinaryCacheStore::writeNarInfo(ref<NarInfo> narInfo)
{
auto narInfoFile = narInfoFileFor(narInfo->path);
upsertFile(narInfoFile, narInfo->to_string(*this), "text/x-nix-narinfo");
{
auto state_(state.lock());
state_->pathInfoCache.upsert(
std::string(narInfo->path.to_string()),
PathInfoCacheValue { .value = std::shared_ptr<NarInfo>(narInfo) });
}
if (diskCache)
diskCache->upsertNarInfo(getUri(), std::string(narInfo->path.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;
}
ref<const ValidPathInfo> BinaryCacheStore::addToStoreCommon(
Source & narSource, RepairFlag repair, CheckSigsFlag checkSigs,
std::function<ValidPathInfo(HashResult)> mkInfo)
{
auto [fdTemp, fnTemp] = createTempFile();
AutoDelete autoDelete(fnTemp);
auto now1 = std::chrono::steady_clock::now();
/* 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 };
std::shared_ptr<FSAccessor> narAccessor;
HashSink narHashSink { htSHA256 };
{
FdSink fileSink(fdTemp.get());
TeeSink teeSinkCompressed { fileSink, fileHashSink };
auto compressionSink = makeCompressionSink(compression, teeSinkCompressed, parallelCompression, compressionLevel);
TeeSink teeSinkUncompressed { *compressionSink, narHashSink };
TeeSource teeSource { narSource, teeSinkUncompressed };
narAccessor = makeNarAccessor(teeSource);
compressionSink->finish();
fileSink.flush();
}
auto now2 = std::chrono::steady_clock::now();
auto info = mkInfo(narHashSink.finish());
auto narInfo = make_ref<NarInfo>(info);
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 == "zstd" ? ".zst" :
compression == "lzip" ? ".lzip" :
compression == "lz4" ? ".lz4" :
compression == "br" ? ".br" :
"");
auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1).count();
printMsg(lvlTalkative, "copying path '%1%' (%2% bytes, compressed %3$.1f%% in %4% ms) to binary cache",
printStorePath(narInfo->path), info.narSize,
((1.0 - (double) fileSize / info.narSize) * 100.0),
duration);
/* Verify that all references are valid. This may do some .narinfo
reads, but typically they'll already be cached. */
for (auto & ref : info.references)
try {
if (ref != info.path)
queryPathInfo(ref);
} catch (InvalidPath &) {
throw Error("cannot add '%s' to the binary cache because the reference '%s' is not valid",
printStorePath(info.path), printStorePath(ref));
}
/* Optionally write a JSON file containing a listing of the
contents of the NAR. */
if (writeNARListing) {
nlohmann::json j = {
{"version", 1},
{"root", listNar(ref<FSAccessor>(narAccessor), "", true)},
};
upsertFile(std::string(info.path.hashPart()) + ".ls", j.dump(), "application/json");
}
/* Optionally maintain an index of DWARF debug info files
consisting of JSON files named 'debuginfo/<build-id>' that
specify the NAR file and member containing the debug info. */
if (writeDebugInfo) {
std::string buildIdDir = "/lib/debug/.build-id";
if (narAccessor->stat(buildIdDir).type == FSAccessor::tDirectory) {
ThreadPool threadPool(25);
auto doFile = [&](std::string member, std::string key, std::string target) {
checkInterrupt();
nlohmann::json json;
json["archive"] = target;
json["member"] = member;
// FIXME: or should we overwrite? The previous link may point
// to a GC'ed file, so overwriting might be useful...
if (fileExists(key)) return;
printMsg(lvlTalkative, "creating debuginfo link from '%s' to '%s'", key, target);
upsertFile(key, json.dump(), "application/json");
};
std::regex regex1("^[0-9a-f]{2}$");
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);
writeNarInfo(narInfo);
stats.narInfoWrite++;
return narInfo;
}
void BinaryCacheStore::addToStore(const ValidPathInfo & info, Source & narSource,
RepairFlag repair, CheckSigsFlag checkSigs)
{
if (!repair && isValidPath(info.path)) {
// FIXME: copyNAR -> null sink
narSource.drain();
return;
}
addToStoreCommon(narSource, repair, checkSigs, {[&](HashResult nar) {
/* FIXME reinstate these, once we can correctly do hash modulo sink as
needed. We need to throw here in case we uploaded a corrupted store path. */
// assert(info.narHash == nar.first);
// assert(info.narSize == nar.second);
return info;
}});
}
StorePath BinaryCacheStore::addToStoreFromDump(Source & dump, std::string_view name,
FileIngestionMethod method, HashType hashAlgo, RepairFlag repair, const StorePathSet & references)
{
if (method != FileIngestionMethod::Recursive || hashAlgo != htSHA256)
unsupported("addToStoreFromDump");
return addToStoreCommon(dump, repair, CheckSigs, [&](HashResult nar) {
ValidPathInfo info {
*this,
name,
FixedOutputInfo {
.hash = {
.method = method,
.hash = nar.first,
},
.references = {
.others = references,
// caller is not capable of creating a self-reference, because this is content-addressed without modulus
.self = false,
},
},
nar.first,
};
info.narSize = nar.second;
return info;
})->path;
}
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));
}
std::optional<StorePath> BinaryCacheStore::queryPathFromHashPart(const std::string & hashPart)
{
auto pseudoPath = StorePath(hashPart + "-" + MissingName);
try {
auto info = queryPathInfo(pseudoPath);
return info->path;
} catch (InvalidPath &) {
return std::nullopt;
}
}
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) {
throw SubstituteGone(std::move(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,
{[=,this](std::future<std::optional<std::string>> fut) {
try {
auto data = fut.get();
if (!data) return (*callbackPtr)({});
stats.narInfoRead++;
(*callbackPtr)((std::shared_ptr<ValidPathInfo>)
std::make_shared<NarInfo>(*this, *data, narInfoFile));
(void) act; // force Activity into this lambda to ensure it stays alive
} catch (...) {
callbackPtr->rethrow();
}
}});
}
StorePath BinaryCacheStore::addToStore(
std::string_view name,
const Path & srcPath,
FileIngestionMethod method,
HashType hashAlgo,
PathFilter & filter,
RepairFlag repair,
const StorePathSet & references)
{
/* FIXME: Make BinaryCacheStore::addToStoreCommon support
non-recursive+sha256 so we can just use the default
implementation of this method in terms of addToStoreFromDump. */
HashSink sink { hashAlgo };
if (method == FileIngestionMethod::Recursive) {
dumpPath(srcPath, sink, filter);
} else {
readFile(srcPath, sink);
}
auto h = sink.finish().first;
auto source = sinkToSource([&](Sink & sink) {
dumpPath(srcPath, sink, filter);
});
return addToStoreCommon(*source, repair, CheckSigs, [&](HashResult nar) {
ValidPathInfo info {
*this,
name,
FixedOutputInfo {
.hash = {
.method = method,
.hash = h,
},
.references = {
.others = references,
// caller is not capable of creating a self-reference, because this is content-addressed without modulus
.self = false,
},
},
nar.first,
};
info.narSize = nar.second;
return info;
})->path;
}
StorePath BinaryCacheStore::addTextToStore(
std::string_view name,
std::string_view s,
const StorePathSet & references,
RepairFlag repair)
{
auto textHash = hashString(htSHA256, s);
auto path = makeTextPath(name, TextInfo { { textHash }, references });
if (!repair && isValidPath(path))
return path;
StringSink sink;
dumpString(s, sink);
StringSource source(sink.s);
return addToStoreCommon(source, repair, CheckSigs, [&](HashResult nar) {
ValidPathInfo info {
*this,
std::string { name },
TextInfo {
{ .hash = textHash },
references,
},
nar.first,
};
info.narSize = nar.second;
return info;
})->path;
}
void BinaryCacheStore::queryRealisationUncached(const DrvOutput & id,
Callback<std::shared_ptr<const Realisation>> callback) noexcept
{
auto outputInfoFilePath = realisationsPrefix + "/" + id.to_string() + ".doi";
auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
Callback<std::optional<std::string>> newCallback = {
[=](std::future<std::optional<std::string>> fut) {
try {
auto data = fut.get();
if (!data) return (*callbackPtr)({});
auto realisation = Realisation::fromJSON(
nlohmann::json::parse(*data), outputInfoFilePath);
return (*callbackPtr)(std::make_shared<const Realisation>(realisation));
} catch (...) {
callbackPtr->rethrow();
}
}
};
getFile(outputInfoFilePath, std::move(newCallback));
}
void BinaryCacheStore::registerDrvOutput(const Realisation& info) {
if (diskCache)
diskCache->upsertRealisation(getUri(), info);
auto filePath = realisationsPrefix + "/" + info.id.to_string() + ".doi";
upsertFile(filePath, info.toJSON().dump(), "application/json");
}
ref<FSAccessor> BinaryCacheStore::getFSAccessor()
{
return make_ref<RemoteFSAccessor>(ref<Store>(shared_from_this()), localNarCache);
}
void BinaryCacheStore::addSignatures(const StorePath & storePath, const StringSet & sigs)
{
/* 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::optional<std::string> BinaryCacheStore::getBuildLogExact(const StorePath & path)
{
auto logPath = "log/" + std::string(baseNameOf(printStorePath(path)));
debug("fetching build log from binary cache '%s/%s'", getUri(), logPath);
return getFile(logPath);
}
void BinaryCacheStore::addBuildLog(const StorePath & drvPath, std::string_view log)
{
assert(drvPath.isDerivation());
upsertFile(
"log/" + std::string(drvPath.to_string()),
(std::string) log, // FIXME: don't copy
"text/plain; charset=utf-8");
}
}