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ba0f8a7a919eaf612bbe69e63ab7003a1d919666
ternfs-XTXMarkets/cpp/ShardDB.cpp
Francesco Mazzoli ba0f8a7a91 Move things around a bit in preparation for cpp CDC 
Also, make log preparation in shard read-only, in preparation for
distributed consensus.
2022-12-11 20:08:31 +00:00

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#include <bit>
#include <chrono>
#include <cstdint>
#include <limits>
#include <rocksdb/db.h>
#include <rocksdb/options.h>
#include <rocksdb/write_batch.h>
#include <system_error>
#include <xxhash.h>
#include "Bincode.hpp"
#include "Crypto.hpp"
#include "Env.hpp"
#include "ShardDB.hpp"
#include "ShardDBData.hpp"
#include "Assert.hpp"
#include "Exception.hpp"
#include "Msgs.hpp"
#include "MsgsGen.hpp"
#include "Time.hpp"
#include "RocksDBUtils.hpp"
#include "ShardDBData.hpp"
#include "AssertiveLock.hpp"
// TODO maybe revisit all those ALWAYS_ASSERTs
// TODO can we pre-allocate the value strings rather than allocating each stupid time?
// ## High level design
//
// Right now, we're not implementing distributed consensus, but we want to prepare
// for this as best we can, since we need it for HA.
//
// This class implements the state storage, assuming that log entries will be persisted
// separatedly (if at all). The state storage is also used to prepare the log entries --
// e.g. there's a tiny bit of state that we read/write to without regards for the
// distributed consensus.
//
// Specifically, we allocate fresh ids, and we read info about block services, when
// preparing log entries.
//
// One question is how we write transactions concurrently, given that we rely on
// applying first one log entry and then the next in that order. We could be smart
// and pool independent log entries, and then write them concurrently. My guess is
// that it's probably not worth doing this, at least since the beginning, and that
// it's better to just serialize the transactions manually with a mutex here in C++.
//
// ## RocksDB schema
//
// Overview of the column families we use. Assumptions from the document:
//
// * 1e12 files
// * 10EiB storage
// * 100000 concurrent clients
// * 20000 storage nodes
//
// * Files:
// - Lots of point queries, we actually never do iteration of any kind here.
// - InodeId (8 bytes): FileBody (16 bytes)
// - Total size: 1e12 files / 256 shards * 24 bytes = ~100GiB
//
// * Spans:
// - Lots of range queries, mostly with SeekForPrev
// - Both files and transient files point to this. This is part of why it makes
// sense to have a different column family: otherwise we couldn't easily
// traverse the transient files with them without stepping over spans.
// - { id: InodeId, byte_offset: uint64_t } (16 bytes): SpanBody
// * SpanBody is 22 bytes of header, plus 0-255 inline body, or ~(10+4)*12 = 168 bytes for blocks
// * Say an average of 200 bytes for key + body, being a bit conservative
// * Let's also say that the max block size is 100MiB
// * Total size: 10EiB / 100MiB / 256 shards * 200 bytes ~ 100GiB
// * However the above is quite optimistic, assuming no fragmentation -- the average file will probably
// be something like 10MiB. So the total dataset for spans will probably be around 1TiB in
// reality.
//
// * TransientFiles:
// - Should use bloom filter here, lots of point queries
// - Unordered iteration for garbage collection
// - InodeId (8 bytes): TransientFileBody (25-281 bytes)
// - The size for this will be neglegible -- say 1% of Files.
//
// * Directories:
// - We store the directory body
// - Unordered traversal for garbage collection
// - InodeId (8 bytes): DirectoryBody (18-273 bytes)
// - Unclear how many directories we have, but it's probably going to have a few order of magnitude less
// than files, e.g. 1e8 directories / 256 shards * 200 bytes = ~80MiB, tiny dataset.
//
// * Edges:
// - Lots of range queries
// - Might want to exploit the fact that for current edges we always seek by prefix (without the name)
// - Two kind of records:
// * { dir: InodeId, current: false, nameHash: nameHash, name: bytes, creationTime: uint64_t }: SnapshotEdgeBody
// * { dir: InodeId, current: true, nameHash: nameHash, name: bytes }: CurrentEdgeBody
// - The sizes below are for snapshot, for current the creation time moves to the body
// - They key size is 25-300 bytes, say 80 bytes on average with a 50 bytes filename
// - The value size is 10 bytes or so
// - Make it 100bytes total for key and value
// - The number of files puts a lower bound on the number of edges, and we don't expect the number to be much
// higher, since we won't have many snaphsot edges, and we have no hardlinks. Also there aren't that many
// directories.
// - So total size is something like 1e12 / 256 * 250 bytes = ~400GiB
// - Similar size as spans -- I think it makes a ton of sense to have them in a different column family
// from directories, given the different order of magnitude when it comes to size.
//
// We'll also store some small metadata in the default column family, e.g.:
//
// - ShardInfoKey::INFO: ShardInfoBody
// - ShardInfoKey::LAST_APPLIED_LOG_ENTRY: uint64_t
// - probably the block servers somewhere...
//
// Total data for the shard will be 1-2TiB. The big ones are `Spans` and `Edges`, which are also
// the ones requiring range queries.
//
// Does this sit well with RocksDB? Their own benchmarks use 900M keys, 20 byte key, 400 byte value,
// so 900e6 * (20+400)byte = ~400GiB. They're not very far off, so it seems reasonable.
//
// ## RocksDB test (state)
//
// We want to test the two heavy cases: spans and edges.
//
// For spans, we have 9 bytes keys, and 200 bytes values. 10EiB / 10MiB / 256 = ~5 billion keys. Total data,
// around 1TiB.
//
// I test with
//
// $ WAL_DIR=benchmarkdb DB_DIR=benchmarkdb KEY_SIZE=9 VALUE_SIZE=200 NUM_KEYS=5000000000 CACHE_SIZE=6442450944 ./benchmark.sh bulkload
//
// This runs like so:
//
// /usr/bin/time -f '%e %U %S' -o /tmp/benchmark_bulkload_fillrandom.log.time ./db_bench --benchmarks=fillrandom --use_existing_db=0 --disable_auto_compactions=1 --sync=0 --max_background_jobs=16 --max_write_buffer_number=8 --allow_concurrent_memtable_write=false --level0_file_num_compaction_trigger=10485760 --level0_slowdown_writes_trigger=10485760 --level0_stop_writes_trigger=10485760 --db=benchmarkdb --wal_dir=benchmarkdb --num=5000000000 --key_size=9 --value_size=200 --block_size=8192 --cache_size=6442450944 --cache_numshardbits=6 --compression_max_dict_bytes=0 --compression_ratio=0.5 --compression_type=zstd --bytes_per_sync=8388608 --benchmark_write_rate_limit=0 --write_buffer_size=134217728 --target_file_size_base=134217728 --max_bytes_for_level_base=1073741824 --verify_checksum=1 --delete_obsolete_files_period_micros=62914560 --max_bytes_for_level_multiplier=8 --statistics=0 --stats_per_interval=1 --stats_interval_seconds=60 --report_interval_seconds=5 --histogram=1 --memtablerep=skip_list --bloom_bits=10 --open_files=-1 --subcompactions=1 --compaction_style=0 --num_levels=8 --min_level_to_compress=-1 --level_compaction_dynamic_level_bytes=true --pin_l0_filter_and_index_blocks_in_cache=1 --threads=1 --memtablerep=vector --allow_concurrent_memtable_write=false --disable_wal=1 --seed=1669566020 --report_file=/tmp/benchmark_bulkload_fillrandom.log.r.csv 2>&1 | tee -a /tmp/benchmark_bulkload_fillrandom.log
//
// This runs in 3:51:09.16, which is 4 times the time it takes to load ~500GiB. The
// vast majority of the time is taken by compaction.
//
// Next I did
//
// WAL_DIR=benchmarkdb DB_DIR=benchmarkdb KEY_SIZE=9 VALUE_SIZE=200 NUM_KEYS=5000000000 CACHE_SIZE=6442450944 DURATION=5400 ./benchmark.sh readrandom
//
// TODO fill in results
static uint64_t computeHash(HashMode mode, const BincodeBytes& bytes) {
switch (mode) {
case HashMode::XXH3_63:
// TODO remove this chopping, pyfuse3 doesn't currently like
// full 64-bit hashes.
return XXH3_64bits(bytes.data, bytes.length) & ~(1ull<<63);
default:
throw EGGS_EXCEPTION("bad hash mode %s", (int)mode);
}
}
static bool validName(const BincodeBytes& name) {
if (name == BincodeBytes(".") || name == BincodeBytes("..")) {
return false;
}
for (int i = 0; i < name.length; i++) {
if (name.data[i] == (uint8_t)'/') {
return false;
}
}
return true;
}
constexpr uint64_t DEADLINE_INTERVAL = (60ull /*mins*/ * 60 /*secs*/ * 1'000'000'000 /*ns*/); // 1 hr
void ShardLogEntry::pack(BincodeBuf& buf) const {
time.pack(buf);
buf.packScalar<uint16_t>((uint16_t)body.kind());
body.pack(buf);
}
void ShardLogEntry::unpack(BincodeBuf& buf) {
time.unpack(buf);
ShardLogEntryKind kind = (ShardLogEntryKind)buf.unpackScalar<uint16_t>();
body.unpack(buf, kind);
}
struct ShardDBImpl {
Env& _env;
ShardId _shid;
std::array<uint8_t, 16> _secretKey;
rocksdb::DB* _db;
rocksdb::ColumnFamilyHandle* _defaultCf;
rocksdb::ColumnFamilyHandle* _transientCf;
rocksdb::ColumnFamilyHandle* _filesCf;
rocksdb::ColumnFamilyHandle* _spansCf;
rocksdb::ColumnFamilyHandle* _directoriesCf;
rocksdb::ColumnFamilyHandle* _edgesCf;
AssertiveLock _applyLogEntryLock;
// ----------------------------------------------------------------
// initialization
ShardDBImpl() = delete;
ShardDBImpl(Env& env, ShardId shid, const std::string& path) : _env(env), _shid(shid) {
// TODO actually figure out the best strategy for each family, including the default
// one.
rocksdb::Options options;
options.create_if_missing = true;
options.create_missing_column_families = true;
std::vector<rocksdb::ColumnFamilyDescriptor> familiesDescriptors{
{rocksdb::kDefaultColumnFamilyName, {}},
{"files", {}},
{"spans", {}},
{"transientFiles", {}},
{"directories", {}},
{"edges", {}},
};
std::vector<rocksdb::ColumnFamilyHandle*> familiesHandles;
auto dbPath = path + "/db";
LOG_INFO(_env, "initializing shard %s RocksDB in %s", _shid, dbPath);
ROCKS_DB_CHECKED_MSG(
rocksdb::DB::Open(options, dbPath, familiesDescriptors, &familiesHandles, &_db),
"could not open RocksDB %s", dbPath
);
ALWAYS_ASSERT(familiesDescriptors.size() == familiesHandles.size());
_defaultCf = familiesHandles[0];
_filesCf = familiesHandles[1];
_spansCf = familiesHandles[2];
_transientCf = familiesHandles[3];
_directoriesCf = familiesHandles[4];
_edgesCf = familiesHandles[5];
_initDb();
}
void close() {
LOG_INFO(_env, "destroying column families and closing database");
ROCKS_DB_CHECKED(_db->DestroyColumnFamilyHandle(_defaultCf));
ROCKS_DB_CHECKED(_db->DestroyColumnFamilyHandle(_filesCf));
ROCKS_DB_CHECKED(_db->DestroyColumnFamilyHandle(_spansCf));
ROCKS_DB_CHECKED(_db->DestroyColumnFamilyHandle(_transientCf));
ROCKS_DB_CHECKED(_db->DestroyColumnFamilyHandle(_directoriesCf));
ROCKS_DB_CHECKED(_db->DestroyColumnFamilyHandle(_edgesCf));
ROCKS_DB_CHECKED(_db->Close());
}
~ShardDBImpl() {
delete _db;
}
void _initDb() {
bool shardInfoExists;
{
std::string value;
auto status = _db->Get({}, shardMetadataKey(&SHARD_INFO_KEY), &value);
if (status.IsNotFound()) {
shardInfoExists = false;
} else {
ROCKS_DB_CHECKED(status);
shardInfoExists = true;
auto shardInfo = ExternalValue<ShardInfoBody>::FromSlice(value);
if (shardInfo->shardId() != _shid) {
throw EGGS_EXCEPTION("expected shard id %s, but found %s in DB", _shid, shardInfo->shardId());
}
shardInfo->getSecretKey(_secretKey);
}
}
if (!shardInfoExists) {
LOG_INFO(_env, "creating shard info, since it does not exist");
generateSecretKey(_secretKey);
StaticValue<ShardInfoBody> shardInfo;
shardInfo->setShardId(_shid);
shardInfo->setSecretKey(_secretKey);
ROCKS_DB_CHECKED(_db->Put({}, shardMetadataKey(&SHARD_INFO_KEY), shardInfo.toSlice()));
}
const auto keyExists = [this](rocksdb::ColumnFamilyHandle* cf, const rocksdb::Slice& key) -> bool {
std::string value;
auto status = _db->Get({}, cf, key, &value);
if (status.IsNotFound()) {
return false;
} else {
ROCKS_DB_CHECKED(status);
return true;
}
};
{
auto k = InodeIdKey::Static(ROOT_DIR_INODE_ID);
if (!keyExists(_directoriesCf, k.toSlice())) {
LOG_INFO(_env, "creating root directory, since it does not exist");
char buf[255];
auto info = defaultDirectoryInfo(buf);
StaticValue<DirectoryBody> dirBody;
dirBody->setOwnerId(NULL_INODE_ID);
dirBody->setMtime({});
dirBody->setHashMode(HashMode::XXH3_63);
dirBody->setInfoInherited(false);
dirBody->setInfo(info);
auto k = InodeIdKey::Static(ROOT_DIR_INODE_ID);
ROCKS_DB_CHECKED(_db->Put({}, _directoriesCf, k.toSlice(), dirBody.toSlice()));
}
}
if (!keyExists(_defaultCf, shardMetadataKey(&NEXT_FILE_ID_KEY))) {
LOG_INFO(_env, "initializing next file id");
InodeId nextFileId(InodeType::FILE, ShardId(_shid), 0);
auto v = InodeIdValue::Static(nextFileId);
ROCKS_DB_CHECKED(_db->Put({}, _defaultCf, shardMetadataKey(&NEXT_FILE_ID_KEY), v.toSlice()));
}
if (!keyExists(_defaultCf, shardMetadataKey(&NEXT_SYMLINK_ID_KEY))) {
LOG_INFO(_env, "initializing next symlink id");
InodeId nextLinkId(InodeType::SYMLINK, ShardId(_shid), 0);
auto v = InodeIdValue::Static(nextLinkId);
ROCKS_DB_CHECKED(_db->Put({}, _defaultCf, shardMetadataKey(&NEXT_SYMLINK_ID_KEY), v.toSlice()));
}
if (!keyExists(_defaultCf, shardMetadataKey(&LAST_APPLIED_LOG_ENTRY_KEY))) {
LOG_INFO(_env, "initializing last applied log entry");
auto v = U64Value::Static(0);
ROCKS_DB_CHECKED(_db->Put({}, _defaultCf, shardMetadataKey(&LAST_APPLIED_LOG_ENTRY_KEY), v.toSlice()));
}
}
// ----------------------------------------------------------------
// read-only path
EggsError _statFile(const StatFileReq& req, StatFileResp& resp) {
std::string fileValue;
ExternalValue<FileBody> file;
EggsError err = _getFile({}, req.id, fileValue, file);
if (err != NO_ERROR) {
return err;
}
resp.mtime = file->mtime();
resp.size = file->fileSize();
return NO_ERROR;
}
EggsError _statTransientFile(const StatTransientFileReq& req, BincodeBytesScratchpad& scratch, StatTransientFileResp& resp) {
std::string fileValue;
{
auto k = InodeIdKey::Static(req.id);
auto status = _db->Get({}, _transientCf, k.toSlice(), &fileValue);
if (status.IsNotFound()) {
return EggsError::FILE_NOT_FOUND;
}
ROCKS_DB_CHECKED(status);
}
auto body = ExternalValue<TransientFileBody>::FromSlice(fileValue);
resp.mtime = body->mtime();
resp.size = body->fileSize();
scratch.copyTo(body->note(), resp.note);
return NO_ERROR;
}
EggsError _statDirectory(const StatDirectoryReq& req, BincodeBytesScratchpad& scratch, StatDirectoryResp& resp) {
std::string dirValue;
ExternalValue<DirectoryBody> dir;
// allowSnapshot=true, the caller can very easily detect if it's snapshot or not
EggsError err = _getDirectory({}, req.id, true, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
resp.mtime = dir->mtime();
resp.owner = dir->ownerId();
scratch.copyTo(dir->info(), resp.info);
return NO_ERROR;
}
EggsError _readDir(const ReadDirReq& req, BincodeBytesScratchpad& scratch, ReadDirResp& resp) {
// snapshot probably not strictly needed -- it's for the possible lookup if we
// got no results. even if returned a false positive/negative there it probably
// wouldn't matter. but it's more pleasant.
WrappedSnapshot snapshot(_db);
rocksdb::ReadOptions options;
options.snapshot = snapshot.snapshot;
// we don't want snapshot directories, so check for that early
{
std::string dirValue;
ExternalValue<DirectoryBody> dir;
EggsError err = _getDirectory(options, req.dirId, false, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
}
{
auto it = WrappedIterator(_db->NewIterator(options, _edgesCf));
StaticValue<EdgeKey> beginKey;
beginKey->setDirIdWithCurrent(req.dirId, true); // current = true
beginKey->setNameHash(req.startHash);
beginKey->setName({});
int budget = UDP_MTU - ShardResponseHeader::STATIC_SIZE - ReadDirResp::STATIC_SIZE;
for (it->Seek(beginKey.toSlice()); it->Valid(); it->Next()) {
auto key = ExternalValue<EdgeKey>::FromSlice(it->key());
if (key->dirId() != req.dirId || !key->current()) {
resp.nextHash = 0; // we've ran out of edges
break;
}
auto edge = ExternalValue<CurrentEdgeBody>::FromSlice(it->value());
CurrentEdge& respEdge = resp.results.els.emplace_back();
respEdge.targetId = edge->targetIdWithLocked().id();
respEdge.nameHash = key->nameHash();
scratch.copyTo(key->name(), respEdge.name);
respEdge.creationTime = edge->creationTime();
budget -= respEdge.packedSize();
if (budget < 0) {
resp.nextHash = key->nameHash();
// remove the current element, and also, do not have straddling hashes
while (!resp.results.els.empty() && resp.results.els.back().nameHash == key->nameHash()) {
resp.results.els.pop_back();
}
break;
}
}
ROCKS_DB_CHECKED(it->status());
}
return NO_ERROR;
}
EggsError _fullReadDir(const FullReadDirReq& req, BincodeBytesScratchpad& scratch, FullReadDirResp& resp) {
// snapshot probably not strictly needed -- it's for the possible lookup if we
// got no results. even if returned a false positive/negative there it probably
// wouldn't matter. but it's more pleasant.
WrappedSnapshot snapshot(_db);
rocksdb::ReadOptions options;
options.snapshot = snapshot.snapshot;
{
auto it = WrappedIterator(_db->NewIterator(options, _edgesCf));
StaticValue<EdgeKey> beginKey;
beginKey->setDirIdWithCurrent(req.dirId, req.cursor.current);
beginKey->setNameHash(req.cursor.startHash);
beginKey->setName(req.cursor.startName);
if (!req.cursor.current) {
beginKey->setCreationTime(req.cursor.startTime);
} else {
ALWAYS_ASSERT(req.cursor.startTime == 0); // TODO proper error at validation time
}
int budget = UDP_MTU - ShardResponseHeader::STATIC_SIZE - FullReadDirResp::STATIC_SIZE;
for (it->Seek(beginKey.toSlice()); it->Valid(); it->Next()) {
auto key = ExternalValue<EdgeKey>::FromSlice(it->key());
if (key->dirId() != req.dirId) {
break;
}
auto& respEdge = resp.results.els.emplace_back();
if (key->current()) {
auto edge = ExternalValue<CurrentEdgeBody>::FromSlice(it->value());
respEdge.current = key->current();
respEdge.targetId = edge->targetIdWithLocked();
respEdge.nameHash = key->nameHash();
scratch.copyTo(key->name(), respEdge.name);
respEdge.creationTime = edge->creationTime();
} else {
auto edge = ExternalValue<SnapshotEdgeBody>::FromSlice(it->value());
respEdge.current = key->current();
respEdge.targetId = edge->targetIdWithOwned();
respEdge.nameHash = key->nameHash();
scratch.copyTo(key->name(), respEdge.name);
respEdge.creationTime = key->creationTime();
}
budget -= respEdge.packedSize();
if (budget < 0) {
int prevCursorSize = FullReadDirCursor::STATIC_SIZE;
while (budget < 0) {
auto& last = resp.results.els.back();
budget += last.packedSize();
resp.next.current = last.current;
resp.next.startHash = last.nameHash;
scratch.copyTo(last.name, resp.next.startName);
resp.next.startTime = last.current ? 0 : last.creationTime;
resp.results.els.pop_back();
budget += prevCursorSize;
budget -= resp.next.packedSize();
prevCursorSize = resp.next.packedSize();
}
break;
}
}
ROCKS_DB_CHECKED(it->status());
}
if (resp.results.els.empty()) {
std::string dirValue;
ExternalValue<DirectoryBody> dir;
// here we want snapshots, which is also why we can do this check later
EggsError err = _getDirectory(options, req.dirId, true, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
}
return NO_ERROR;
}
EggsError _lookup(const LookupReq& req, LookupResp& resp) {
WrappedSnapshot snapshot(_db);
rocksdb::ReadOptions options;
options.snapshot = snapshot.snapshot;
uint64_t nameHash;
{
std::string value;
ExternalValue<DirectoryBody> dir;
EggsError err = _getDirectory(options, req.dirId, false, value, dir);
if (err != NO_ERROR) {
return err;
}
nameHash = computeHash(dir->hashMode(), req.name);
}
{
StaticValue<EdgeKey> reqKey;
reqKey->setDirIdWithCurrent(req.dirId, true); // current=true
reqKey->setNameHash(nameHash);
reqKey->setName(req.name);
std::string edgeValue;
auto status = _db->Get(options, _edgesCf, reqKey.toSlice(), &edgeValue);
if (status.IsNotFound()) {
return EggsError::NAME_NOT_FOUND;
}
ROCKS_DB_CHECKED(status);
ExternalValue<CurrentEdgeBody> edge(edgeValue);
resp.creationTime = edge->creationTime();
resp.targetId = edge->targetIdWithLocked().id();
}
return NO_ERROR;
}
EggsError _visitTransientFiles(const VisitTransientFilesReq& req, BincodeBytesScratchpad& scratch, VisitTransientFilesResp& resp) {
resp.nextId = NULL_INODE_ID;
{
WrappedIterator it(_db->NewIterator({}, _transientCf));
auto beginKey = InodeIdKey::Static(req.beginId);
int budget = UDP_MTU - ShardResponseHeader::STATIC_SIZE - VisitTransientFilesResp::STATIC_SIZE;
for (it->Seek(beginKey.toSlice()); it->Valid(); it->Next()) {
auto id = ExternalValue<InodeIdKey>::FromSlice(it->key());
auto file = ExternalValue<TransientFileBody>::FromSlice(it->value());
auto& respFile = resp.files.els.emplace_back();
respFile.id = id->id();
_calcCookie(respFile.id, respFile.cookie.data);
respFile.deadlineTime = file->deadline();
budget -= respFile.packedSize();
if (budget <= 0) {
resp.nextId = resp.files.els.back().id;
resp.files.els.pop_back();
break;
}
}
ROCKS_DB_CHECKED(it->status());
}
return NO_ERROR;
}
EggsError _visitDirectories(const VisitDirectoriesReq& req, BincodeBytesScratchpad& scratch, VisitDirectoriesResp& resp) {
resp.nextId = NULL_INODE_ID;
int budget = UDP_MTU - ShardResponseHeader::STATIC_SIZE - VisitDirectoriesResp::STATIC_SIZE;
int maxIds = (budget/8) + 1; // include next inode
{
WrappedIterator it(_db->NewIterator({}, _directoriesCf));
auto beginKey = InodeIdKey::Static(req.beginId);
for (
it->Seek(beginKey.toSlice());
it->Valid() && resp.ids.els.size() < maxIds;
it->Next()
) {
auto id = ExternalValue<InodeIdKey>::FromSlice(it->key());
resp.ids.els.emplace_back(id->id());
}
}
if (resp.ids.els.size() == maxIds) {
resp.nextId = resp.ids.els.back();
resp.ids.els.pop_back();
}
return NO_ERROR;
}
EggsError read(const ShardReqContainer& req, BincodeBytesScratchpad& scratch, ShardRespContainer& resp) {
LOG_DEBUG(_env, "processing read-only request of kind %s", req.kind());
EggsError err = NO_ERROR;
scratch.reset();
resp.clear();
switch (req.kind()) {
case ShardMessageKind::STAT_FILE:
err = _statFile(req.getStatFile(), resp.setStatFile());
break;
case ShardMessageKind::READ_DIR:
err = _readDir(req.getReadDir(), scratch, resp.setReadDir());
break;
case ShardMessageKind::STAT_DIRECTORY:
err = _statDirectory(req.getStatDirectory(), scratch, resp.setStatDirectory());
break;
case ShardMessageKind::STAT_TRANSIENT_FILE:
err = _statTransientFile(req.getStatTransientFile(), scratch, resp.setStatTransientFile());
break;
case ShardMessageKind::LOOKUP:
err = _lookup(req.getLookup(), resp.setLookup());
break;
case ShardMessageKind::VISIT_TRANSIENT_FILES:
err = _visitTransientFiles(req.getVisitTransientFiles(), scratch, resp.setVisitTransientFiles());
break;
case ShardMessageKind::FULL_READ_DIR:
err = _fullReadDir(req.getFullReadDir(), scratch, resp.setFullReadDir());
break;
case ShardMessageKind::VISIT_DIRECTORIES:
err = _visitDirectories(req.getVisitDirectories(), scratch, resp.setVisitDirectories());
break;
case ShardMessageKind::FILE_SPANS:
case ShardMessageKind::VISIT_FILES:
case ShardMessageKind::BLOCK_SERVICE_FILES:
throw EGGS_EXCEPTION("UNIMPLEMENTED %s", req.kind());
default:
throw EGGS_EXCEPTION("bad read-only shard message kind %s", req.kind());
}
ALWAYS_ASSERT(req.kind() == resp.kind());
return err;
}
// ----------------------------------------------------------------
// log preparation
EggsError _prepareConstructFile(EggsTime time, const ConstructFileReq& req, BincodeBytesScratchpad& scratch, ConstructFileEntry& entry) {
if (req.type != (uint8_t)InodeType::FILE && req.type != (uint8_t)InodeType::SYMLINK) {
return EggsError::TYPE_IS_DIRECTORY;
}
entry.type = req.type;
scratch.copyTo(req.note, entry.note);
entry.deadlineTime = time + DEADLINE_INTERVAL;
return NO_ERROR;
}
EggsError _checkTransientFileCookie(InodeId id, std::array<uint8_t, 8> cookie) {
if (id.type() != InodeType::FILE && id.type() != InodeType::SYMLINK) {
return EggsError::TYPE_IS_DIRECTORY;
}
std::array<uint8_t, 8> expectedCookie;
_calcCookie(id, expectedCookie);
if (cookie != expectedCookie) {
return EggsError::BAD_COOKIE;
}
return NO_ERROR;
}
EggsError _prepareLinkFile(EggsTime time, const LinkFileReq& req, BincodeBytesScratchpad& scratch, LinkFileEntry& entry) {
// some early, preliminary checks
if (req.ownerId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.ownerId.shard() != _shid || req.fileId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
EggsError err = _checkTransientFileCookie(req.fileId, req.cookie.data);
if (err != NO_ERROR) {
return err;
}
entry.fileId = req.fileId;
scratch.copyTo(req.name, entry.name);
entry.ownerId = req.ownerId;
return NO_ERROR;
}
EggsError _prepareSameDirectoryRename(EggsTime time, const SameDirectoryRenameReq& req, BincodeBytesScratchpad& scratch, SameDirectoryRenameEntry& entry) {
if (req.dirId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (!validName(req.newName)) {
return EggsError::BAD_NAME;
}
if (req.dirId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
entry.dirId = req.dirId;
scratch.copyTo(req.oldName, entry.oldName);
scratch.copyTo(req.newName, entry.newName);
entry.targetId = req.targetId;
return NO_ERROR;
}
EggsError _prepareSoftUnlinkFile(EggsTime time, const SoftUnlinkFileReq& req, BincodeBytesScratchpad& scratch, SoftUnlinkFileEntry& entry) {
if (req.ownerId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.fileId.type() != InodeType::FILE && req.fileId.type() != InodeType::SYMLINK) {
return EggsError::TYPE_IS_DIRECTORY;
}
if (req.ownerId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
entry.ownerId = req.ownerId;
entry.fileId = req.fileId;
scratch.copyTo(req.name, entry.name);
return NO_ERROR;
}
EggsError _prepareCreateDirectoryInode(EggsTime time, const CreateDirectoryInodeReq& req, BincodeBytesScratchpad& scratch, CreateDirectoryInodeEntry& entry) {
if (req.id.shard() != _shid) {
return EggsError::BAD_SHARD;
}
if (req.id.type() != InodeType::DIRECTORY || req.ownerId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.info.inherited != (req.info.body.length == 0)) {
return EggsError::BAD_DIRECTORY_INFO;
}
entry.id = req.id;
entry.ownerId = req.ownerId;
entry.info.inherited = req.info.inherited;
scratch.copyTo(req.info.body, entry.info.body);
return NO_ERROR;
}
EggsError _prepareCreateLockedCurrentEdge(EggsTime time, const CreateLockedCurrentEdgeReq& req, BincodeBytesScratchpad& scratch, CreateLockedCurrentEdgeEntry& entry) {
if (entry.creationTime >= time) {
return EggsError::CREATION_TIME_TOO_RECENT;
}
if (req.dirId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.dirId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
if (!validName(req.name)) {
return EggsError::BAD_NAME;
}
ALWAYS_ASSERT(req.targetId != NULL_INODE_ID); // proper error
entry.dirId = req.dirId;
entry.creationTime = req.creationTime;
entry.targetId = req.targetId;
scratch.copyTo(req.name, entry.name);
return NO_ERROR;
}
EggsError _prepareUnlockCurrentEdge(EggsTime time, const UnlockCurrentEdgeReq& req, BincodeBytesScratchpad& scratch, UnlockCurrentEdgeEntry& entry) {
if (req.dirId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.dirId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
entry.dirId = req.dirId;
entry.targetId = req.targetId;
scratch.copyTo(req.name, entry.name);
entry.wasMoved = req.wasMoved;
return NO_ERROR;
}
EggsError _prepareLockCurrentEdge(EggsTime time, const LockCurrentEdgeReq& req, BincodeBytesScratchpad& scratch, LockCurrentEdgeEntry& entry) {
if (req.dirId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.dirId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
entry.dirId = req.dirId;
scratch.copyTo(req.name, entry.name);
entry.targetId = req.targetId;
return NO_ERROR;
}
EggsError _prepareRemoveDirectoryOwner(EggsTime time, const RemoveDirectoryOwnerReq& req, BincodeBytesScratchpad& scratch, RemoveDirectoryOwnerEntry& entry) {
if (req.dirId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.dirId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
if (req.info.length == 0) {
return EggsError::BAD_DIRECTORY_INFO;
}
ALWAYS_ASSERT(req.dirId != ROOT_DIR_INODE_ID); // TODO proper error
entry.dirId = req.dirId;
scratch.copyTo(req.info, entry.info);
return NO_ERROR;
}
EggsError _prepareRemoveInode(EggsTime time, const RemoveInodeReq& req, BincodeBytesScratchpad& scratch, RemoveInodeEntry& entry) {
if (req.id.shard() != _shid) {
return EggsError::BAD_SHARD;
}
if (req.id == ROOT_DIR_INODE_ID) {
return EggsError::CANNOT_REMOVE_ROOT_DIRECTORY;
}
entry.id = req.id;
return NO_ERROR;
}
EggsError _prepareSetDirectoryOwner(EggsTime time, const SetDirectoryOwnerReq& req, BincodeBytesScratchpad& scratch, SetDirectoryOwnerEntry& entry) {
if (req.dirId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.dirId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
if (req.ownerId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
entry.dirId = req.dirId;
entry.ownerId = req.ownerId;
return NO_ERROR;
}
EggsError _prepareSetDirectoryInfo(EggsTime time, const SetDirectoryInfoReq& req, BincodeBytesScratchpad& scratch, SetDirectoryInfoEntry& entry) {
if (req.id.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.id.shard() != _shid) {
return EggsError::BAD_SHARD;
}
if (req.info.inherited && req.id == ROOT_DIR_INODE_ID) {
return EggsError::BAD_DIRECTORY_INFO;
}
if (req.info.inherited != (req.info.body.length == 0)) {
return EggsError::BAD_DIRECTORY_INFO;
}
entry.dirId = req.id;
entry.info = req.info;
return NO_ERROR;
}
EggsError _prepareRemoveNonOwnedEdge(EggsTime time, const RemoveNonOwnedEdgeReq& req, BincodeBytesScratchpad& scratch, RemoveNonOwnedEdgeEntry& entry) {
if (req.dirId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.dirId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
entry.dirId = req.dirId;
entry.creationTime = req.creationTime;
scratch.copyTo(req.name, entry.name);
return NO_ERROR;
}
EggsError _prepareIntraShardHardFileUnlink(EggsTime time, const IntraShardHardFileUnlinkReq& req, BincodeBytesScratchpad& scratch, IntraShardHardFileUnlinkEntry& entry) {
if (req.ownerId.type() != InodeType::DIRECTORY) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
if (req.targetId.type() != InodeType::FILE && req.targetId.type() != InodeType::SYMLINK) {
return EggsError::TYPE_IS_DIRECTORY;
}
if (req.ownerId.shard() != _shid || req.targetId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
entry.ownerId = req.ownerId;
entry.targetId = req.targetId;
scratch.copyTo(req.name, entry.name);
entry.creationTime = req.creationTime;
return NO_ERROR;
}
EggsError _prepareRemoveSpanInitiate(EggsTime time, const RemoveSpanInitiateReq& req, BincodeBytesScratchpad& scratch, RemoveSpanInitiateEntry& entry) {
if (req.fileId.type() != InodeType::FILE && req.fileId.type() != InodeType::SYMLINK) {
return EggsError::TYPE_IS_DIRECTORY;
}
if (req.fileId.shard() != _shid) {
return EggsError::BAD_SHARD;
}
{
EggsError err = _checkTransientFileCookie(req.fileId, req.cookie.data);
if (err != NO_ERROR) {
return err;
}
}
entry.fileId = req.fileId;
return NO_ERROR;
}
EggsError prepareLogEntry(const ShardReqContainer& req, BincodeBytesScratchpad& scratch, ShardLogEntry& logEntry) {
LOG_DEBUG(_env, "processing write request of kind %s", req.kind());
scratch.reset();
logEntry.clear();
EggsError err = NO_ERROR;
EggsTime time = eggsNow();
logEntry.time = time;
auto& logEntryBody = logEntry.body;
switch (req.kind()) {
case ShardMessageKind::CONSTRUCT_FILE:
err = _prepareConstructFile(time, req.getConstructFile(), scratch, logEntryBody.setConstructFile());
break;
case ShardMessageKind::LINK_FILE:
err = _prepareLinkFile(time, req.getLinkFile(), scratch, logEntryBody.setLinkFile());
break;
case ShardMessageKind::SAME_DIRECTORY_RENAME:
err = _prepareSameDirectoryRename(time, req.getSameDirectoryRename(), scratch, logEntryBody.setSameDirectoryRename());
break;
case ShardMessageKind::SOFT_UNLINK_FILE:
err = _prepareSoftUnlinkFile(time, req.getSoftUnlinkFile(), scratch, logEntryBody.setSoftUnlinkFile());
break;
case ShardMessageKind::CREATE_DIRECTORY_INODE:
err = _prepareCreateDirectoryInode(time, req.getCreateDirectoryInode(), scratch, logEntryBody.setCreateDirectoryInode());
break;
case ShardMessageKind::CREATE_LOCKED_CURRENT_EDGE:
err = _prepareCreateLockedCurrentEdge(time, req.getCreateLockedCurrentEdge(), scratch, logEntryBody.setCreateLockedCurrentEdge());
break;
case ShardMessageKind::UNLOCK_CURRENT_EDGE:
err = _prepareUnlockCurrentEdge(time, req.getUnlockCurrentEdge(), scratch, logEntryBody.setUnlockCurrentEdge());
break;
case ShardMessageKind::LOCK_CURRENT_EDGE:
err = _prepareLockCurrentEdge(time, req.getLockCurrentEdge(), scratch, logEntryBody.setLockCurrentEdge());
break;
case ShardMessageKind::REMOVE_DIRECTORY_OWNER:
err = _prepareRemoveDirectoryOwner(time, req.getRemoveDirectoryOwner(), scratch, logEntryBody.setRemoveDirectoryOwner());
break;
case ShardMessageKind::REMOVE_INODE:
err = _prepareRemoveInode(time, req.getRemoveInode(), scratch, logEntryBody.setRemoveInode());
break;
case ShardMessageKind::SET_DIRECTORY_OWNER:
err = _prepareSetDirectoryOwner(time, req.getSetDirectoryOwner(), scratch, logEntryBody.setSetDirectoryOwner());
break;
case ShardMessageKind::SET_DIRECTORY_INFO:
err = _prepareSetDirectoryInfo(time, req.getSetDirectoryInfo(), scratch, logEntryBody.setSetDirectoryInfo());
break;
case ShardMessageKind::REMOVE_NON_OWNED_EDGE:
err = _prepareRemoveNonOwnedEdge(time, req.getRemoveNonOwnedEdge(), scratch, logEntryBody.setRemoveNonOwnedEdge());
break;
case ShardMessageKind::INTRA_SHARD_HARD_FILE_UNLINK:
err = _prepareIntraShardHardFileUnlink(time, req.getIntraShardHardFileUnlink(), scratch, logEntryBody.setIntraShardHardFileUnlink());
break;
case ShardMessageKind::REMOVE_SPAN_INITIATE:
err = _prepareRemoveSpanInitiate(time, req.getRemoveSpanInitiate(), scratch, logEntryBody.setRemoveSpanInitiate());
break;
case ShardMessageKind::ADD_SPAN_INITIATE:
case ShardMessageKind::ADD_SPAN_CERTIFY:
case ShardMessageKind::REMOVE_SPAN_CERTIFY:
case ShardMessageKind::SWAP_BLOCKS:
case ShardMessageKind::REMOVE_OWNED_SNAPSHOT_FILE_EDGE:
case ShardMessageKind::MAKE_FILE_TRANSIENT:
throw EGGS_EXCEPTION("UNIMPLEMENTED %s", req.kind());
default:
throw EGGS_EXCEPTION("bad write shard message kind %s", req.kind());
}
if (err == NO_ERROR) {
LOG_DEBUG(_env, "prepared log entry of kind %s, for request of kind %s", logEntryBody.kind(), req.kind());
} else {
LOG_INFO(_env, "could not prepare log entry for request of kind %s: %s", req.kind(), err);
}
return err;
}
// ----------------------------------------------------------------
// log application
void _advanceLastAppliedLogEntry(rocksdb::WriteBatch& batch, uint64_t index) {
uint64_t oldIndex = _lastAppliedLogEntry();
ALWAYS_ASSERT(oldIndex+1 == index, "old index is %s, expected %s, got %s", oldIndex, oldIndex+1, index);
LOG_DEBUG(_env, "bumping log index from %s to %s", oldIndex, index);
StaticValue<U64Value> v;
v->setU64(index);
ROCKS_DB_CHECKED(batch.Put({}, shardMetadataKey(&LAST_APPLIED_LOG_ENTRY_KEY), v.toSlice()));
}
EggsError _applyConstructFile(rocksdb::WriteBatch& batch, EggsTime time, const ConstructFileEntry& entry, BincodeBytesScratchpad& scratch, ConstructFileResp& resp) {
const auto nextFileId = [this, &batch](const ShardMetadataKey* key) -> InodeId {
std::string value;
ROCKS_DB_CHECKED(_db->Get({}, shardMetadataKey(key), &value));
ExternalValue<InodeIdValue> inodeId(value);
inodeId->setId(InodeId::FromU64(inodeId->id().u64 + 0x100));
ROCKS_DB_CHECKED(batch.Put(shardMetadataKey(key), inodeId.toSlice()));
return inodeId->id();
};
InodeId id;
if (entry.type == (uint8_t)InodeType::FILE) {
id = nextFileId(&NEXT_FILE_ID_KEY);
} else if (entry.type == (uint8_t)InodeType::SYMLINK) {
id = nextFileId(&NEXT_SYMLINK_ID_KEY);
} else {
ALWAYS_ASSERT(false, "Bad type %s", (int)entry.type);
}
// write to rocks
StaticValue<TransientFileBody> transientFile;
transientFile->setFileSize(0);
transientFile->setMtime(time);
transientFile->setDeadline(entry.deadlineTime);
transientFile->setLastSpanState(SpanState::CLEAN);
transientFile->setNote(entry.note);
auto k = InodeIdKey::Static(id);
ROCKS_DB_CHECKED(batch.Put(_transientCf, k.toSlice(), transientFile.toSlice()));
// prepare response
resp.id = id;
_calcCookie(resp.id, resp.cookie.data);
return NO_ERROR;
}
EggsError _applyLinkFile(rocksdb::WriteBatch& batch, EggsTime time, const LinkFileEntry& entry, BincodeBytesScratchpad& scratch, LinkFileResp& resp) {
std::string fileValue;
ExternalValue<TransientFileBody> transientFile;
{
EggsError err = _getTransientFile({}, time, false /*allowPastDeadline*/, entry.fileId, fileValue, transientFile);
if (err == EggsError::FILE_NOT_FOUND) {
// Check if the file has already been linked to simplify the life of retrying
// clients.
ExternalValue<FileBody> file;
EggsError err = _getFile({}, entry.fileId, fileValue, file); // don't overwrite old error
if (err == NO_ERROR) {
return NO_ERROR; // the non-transient file exists already, we're done
}
} else if (err != NO_ERROR) {
return err;
}
}
if (transientFile->lastSpanState() != SpanState::CLEAN) {
return EggsError::LAST_SPAN_STATE_NOT_CLEAN;
}
// move from transient to non-transient.
auto fileKey = InodeIdKey::Static(entry.fileId);
ROCKS_DB_CHECKED(batch.Delete(_transientCf, fileKey.toSlice()));
StaticValue<FileBody> file;
file->setMtime(time);
file->setFileSize(transientFile->fileSize());
ROCKS_DB_CHECKED(batch.Put(_filesCf, fileKey.toSlice(), file.toSlice()));
// create edge in owner.
{
EggsError err = ShardDBImpl::_createCurrentEdge(time, time, batch, entry.ownerId, entry.name, entry.fileId, false);
if (err != NO_ERROR) {
return err;
}
}
return NO_ERROR;
}
EggsError _initiateDirectoryModification(EggsTime time, rocksdb::WriteBatch& batch, InodeId dirId, bool allowSnapshot, std::string& dirValue, ExternalValue<DirectoryBody>& dir) {
ExternalValue<DirectoryBody> tmpDir;
EggsError err = _getDirectory({}, dirId, allowSnapshot, dirValue, tmpDir);
if (err != NO_ERROR) {
return err;
}
// Don't go backwards in time. This is important amongst other things to ensure
// that we do not have snapshot edges to be the same. This should be very uncommon.
if (tmpDir->mtime() >= time) {
RAISE_ALERT(_env, "trying to modify dir %s going backwards in time, dir mtime is %s, log entry time is %s", dirId, tmpDir->mtime(), time);
return EggsError::DIRECTORY_MTIME_IS_TOO_RECENT;
}
// Modify the directory mtime
tmpDir->setMtime(time);
{
auto k = InodeIdKey::Static(dirId);
ROCKS_DB_CHECKED(batch.Put(_directoriesCf, k.toSlice(), tmpDir.toSlice()));
}
dir = tmpDir;
return NO_ERROR;
}
// Note that we cannot expose an API which allows us to create non-locked current edges,
// see comment for CreateLockedCurrentEdgeReq.
//
// `logEntryTime` and `creationTime` are separate since we need a different `creationTime`
// for CreateDirectoryInodeReq.
//
// It must be the case that `creationTime <= logEntryTime`.
EggsError _createCurrentEdge(EggsTime logEntryTime, EggsTime creationTime, rocksdb::WriteBatch& batch, InodeId dirId, const BincodeBytes& name, InodeId targetId, bool locked) {
ALWAYS_ASSERT(creationTime <= logEntryTime);
// fetch the directory
ExternalValue<DirectoryBody> dir;
std::string dirValue;
{
// allowSnaphsot=false since we cannot create current edges in snapshot directories.
EggsError err = _initiateDirectoryModification(logEntryTime, batch, dirId, false, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
}
uint64_t nameHash = computeHash(dir->hashMode(), name);
// Next, we need to look at the current edge with the same name, if any.
StaticValue<EdgeKey> edgeKey;
edgeKey->setDirIdWithCurrent(dirId, true); // current=true
edgeKey->setNameHash(nameHash);
edgeKey->setName(name);
std::string edgeValue;
auto status = _db->Get({}, _edgesCf, edgeKey.toSlice(), &edgeValue);
// in the block below, we exit the function early if something is off.
if (status.IsNotFound()) {
// we're the first one here -- we only need to check the time of
// the snaphsot edges if the creation time is earlier than the
// log entry time, otherwise we know that the snapshot edges are
// all older, since they were all created before logEntryTime.
StaticValue<EdgeKey> snapshotEdgeKey;
snapshotEdgeKey->setDirIdWithCurrent(dirId, false); // snapshhot (current=false)
snapshotEdgeKey->setNameHash(nameHash);
snapshotEdgeKey->setName(name);
snapshotEdgeKey->setCreationTime({std::numeric_limits<uint64_t>::max()});
WrappedIterator it(_db->NewIterator({}, _edgesCf));
it->SeekForPrev(snapshotEdgeKey.toSlice());
if (it->Valid() && !it->status().IsNotFound()) {
auto k = ExternalValue<EdgeKey>::FromSlice(it->key());
if (k->dirId() == dirId && !k->current() && k->nameHash() == nameHash && k->name() == name) {
if (k->creationTime() >= creationTime) {
return EggsError::MORE_RECENT_SNAPSHOT_EDGE;
}
}
}
ROCKS_DB_CHECKED(it->status());
} else {
ROCKS_DB_CHECKED(status);
ExternalValue<CurrentEdgeBody> existingEdge(edgeValue);
if (existingEdge->targetIdWithLocked().extra()) { // locked
// we have an existing locked edge, we need to make sure that it's the one we expect for
// idempotency.
if (
!locked || // the one we're trying to create isn't locked
(targetId != existingEdge->targetIdWithLocked().id() || creationTime != existingEdge->creationTime()) // we're trying to create a different locked edge
) {
return EggsError::NAME_IS_LOCKED;
}
} else {
// We're kicking out a non-locked current edge. The only circumstance where we allow
// this automatically is if a file is overriding another file, which is also how it
// works in linux/posix (see `man 2 rename`).
if (existingEdge->creationTime() >= creationTime) {
return EggsError::MORE_RECENT_CURRENT_EDGE;
}
if (
targetId.type() == InodeType::DIRECTORY || existingEdge->targetIdWithLocked().id().type() == InodeType::DIRECTORY
) {
return EggsError::CANNOT_OVERRIDE_NAME;
}
// make what is now the current edge a snapshot edge -- no need to delete it,
// it'll be overwritten below.
{
StaticValue<EdgeKey> k;
k->setDirIdWithCurrent(dirId, false); // snapshot (current=false)
k->setNameHash(nameHash);
k->setName(name);
k->setCreationTime(existingEdge->creationTime());
StaticValue<SnapshotEdgeBody> v;
// this was current, so it's now owned.
v->setTargetIdWithOwned(InodeIdExtra(existingEdge->targetIdWithLocked().id(), true));
ROCKS_DB_CHECKED(batch.Put(_edgesCf, k.toSlice(), v.toSlice()));
}
}
}
// OK, we're now ready to insert the current edge
StaticValue<CurrentEdgeBody> edgeBody;
edgeBody->setTargetIdWithLocked(InodeIdExtra(targetId, locked));
edgeBody->setCreationTime(creationTime);
ROCKS_DB_CHECKED(batch.Put(_edgesCf, edgeKey.toSlice(), edgeBody.toSlice()));
return NO_ERROR;
}
EggsError _applySameDirectoryRename(EggsTime time, rocksdb::WriteBatch& batch, const SameDirectoryRenameEntry& entry, SameDirectoryRenameResp& resp) {
// First, remove the old edge -- which won't be owned anymore, since we're renaming it.
{
EggsError err = _softUnlinkCurrentEdge(time, batch, entry.dirId, entry.oldName, entry.targetId, false);
if (err != NO_ERROR) {
return err;
}
}
// Now, create the new one
{
EggsError err = _createCurrentEdge(time, time, batch, entry.dirId, entry.newName, entry.targetId, false);
if (err != NO_ERROR) {
return err;
}
}
return NO_ERROR;
}
EggsError _softUnlinkCurrentEdge(EggsTime time, rocksdb::WriteBatch& batch, InodeId dirId, const BincodeBytes& name, InodeId targetId, bool owned) {
// fetch the directory
ExternalValue<DirectoryBody> dir;
std::string dirValue;
{
// allowSnaphsot=false since we can't have current edges in snapshot dirs
EggsError err = _initiateDirectoryModification(time, batch, dirId, false, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
}
uint64_t nameHash = computeHash(dir->hashMode(), name);
// get the edge
StaticValue<EdgeKey> edgeKey;
edgeKey->setDirIdWithCurrent(dirId, true); // current=true
edgeKey->setNameHash(nameHash);
edgeKey->setName(name);
std::string edgeValue;
auto status = _db->Get({}, _edgesCf, edgeKey.toSlice(), &edgeValue);
if (status.IsNotFound()) {
return EggsError::NAME_NOT_FOUND;
}
ROCKS_DB_CHECKED(status);
ExternalValue<CurrentEdgeBody> edgeBody(edgeValue);
if (edgeBody->targetIdWithLocked().id() != targetId) {
return EggsError::MISMATCHING_TARGET;
}
if (edgeBody->targetIdWithLocked().extra()) { // locked
return EggsError::NAME_IS_LOCKED;
}
// delete the current edge
batch.Delete(_edgesCf, edgeKey.toSlice());
// add the two snapshot edges, one for what was the current edge,
// and another to signify deletion
{
StaticValue<EdgeKey> k;
k->setDirIdWithCurrent(dirId, false); // snapshot (current=false)
k->setNameHash(nameHash);
k->setName(name);
k->setCreationTime(edgeBody->creationTime());
StaticValue<SnapshotEdgeBody> v;
v->setTargetIdWithOwned(InodeIdExtra(targetId, owned));
ROCKS_DB_CHECKED(batch.Put(_edgesCf, k.toSlice(), v.toSlice()));
k->setCreationTime(time);
v->setTargetIdWithOwned(InodeIdExtra(NULL_INODE_ID, false));
ROCKS_DB_CHECKED(batch.Put(_edgesCf, k.toSlice(), v.toSlice()));
}
return NO_ERROR;
}
EggsError _applySoftUnlinkFile(EggsTime time, rocksdb::WriteBatch& batch, const SoftUnlinkFileEntry& entry, SoftUnlinkFileResp& resp) {
return _softUnlinkCurrentEdge(time, batch, entry.ownerId, entry.name, entry.fileId, true);
}
EggsError _applyCreateDirectoryInode(EggsTime time, rocksdb::WriteBatch& batch, const CreateDirectoryInodeEntry& entry, CreateDirectoryInodeResp& resp) {
// The assumption here is that only the CDC creates directories, and it doles out
// inode ids per transaction, so that you'll never get competing creates here, but
// we still check that the parent makes sense.
{
std::string dirValue;
ExternalValue<DirectoryBody> dir;
// we never create directories as snapshot
EggsError err = _getDirectory({}, entry.id, false, dirValue, dir);
if (err == NO_ERROR) {
if (dir->ownerId() != entry.ownerId) {
return EggsError::MISMATCHING_OWNER;
} else {
return NO_ERROR;
}
} else if (err == EggsError::DIRECTORY_NOT_FOUND) {
// we continue
} else {
return err;
}
}
{
auto dirKey = InodeIdKey::Static(entry.id);
StaticValue<DirectoryBody> dir;
dir->setOwnerId(entry.ownerId);
dir->setMtime(time);
dir->setHashMode(HashMode::XXH3_63);
dir->setInfoInherited(entry.info.inherited);
dir->setInfo(entry.info.body);
ROCKS_DB_CHECKED(batch.Put(_directoriesCf, dirKey.toSlice(), dir.toSlice()));
}
return NO_ERROR;
}
EggsError _applyCreateLockedCurrentEdge(EggsTime time, rocksdb::WriteBatch& batch, const CreateLockedCurrentEdgeEntry& entry, CreateLockedCurrentEdgeResp& resp) {
LOG_INFO(_env, "Creating edge %s -> %s", entry.dirId, entry.targetId);
return _createCurrentEdge(time, entry.creationTime, batch, entry.dirId, entry.name, entry.targetId, true); // locked=true
}
EggsError _applyUnlockCurrentEdge(EggsTime time, rocksdb::WriteBatch& batch, const UnlockCurrentEdgeEntry& entry, UnlockCurrentEdgeResp& resp) {
uint64_t nameHash;
{
std::string dirValue;
ExternalValue<DirectoryBody> dir;
// allowSnaphsot=false since no current edges in snapshot dirs
EggsError err = _getDirectory({}, entry.dirId, false, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
nameHash = computeHash(dir->hashMode(), entry.name);
}
StaticValue<EdgeKey> currentKey;
currentKey->setDirIdWithCurrent(entry.dirId, true); // current=true
currentKey->setNameHash(nameHash);
currentKey->setName(entry.name);
std::string edgeValue;
{
auto status = _db->Get({}, _edgesCf, currentKey.toSlice(), &edgeValue);
if (status.IsNotFound()) {
return EggsError::EDGE_NOT_FOUND;
}
ROCKS_DB_CHECKED(status);
}
ExternalValue<CurrentEdgeBody> edge(edgeValue);
if (edge->locked()) {
edge->setTargetIdWithLocked(InodeIdExtra(entry.targetId, false)); // locked=false
ROCKS_DB_CHECKED(batch.Put(_edgesCf, currentKey.toSlice(), edge.toSlice()));
}
if (entry.wasMoved) {
// We need to move the current edge to snapshot, and create a new snapshot
// edge with the deletion.
ROCKS_DB_CHECKED(batch.Delete(_edgesCf, currentKey.toSlice()));
StaticValue<EdgeKey> snapshotKey;
snapshotKey->setDirIdWithCurrent(entry.dirId, false); // snapshot (current=false)
snapshotKey->setNameHash(nameHash);
snapshotKey->setName(entry.name);
snapshotKey->setCreationTime(edge->creationTime());
StaticValue<SnapshotEdgeBody> snapshotBody;
snapshotBody->setTargetIdWithOwned(InodeIdExtra(entry.targetId, false)); // not owned (this was moved somewhere else)
ROCKS_DB_CHECKED(batch.Put(_edgesCf, snapshotKey.toSlice(), snapshotBody.toSlice()));
snapshotKey->setCreationTime(time);
snapshotBody->setTargetIdWithOwned(InodeIdExtra(NULL_INODE_ID, false)); // deletion edges are never owned
ROCKS_DB_CHECKED(batch.Put(_edgesCf, snapshotKey.toSlice(), snapshotBody.toSlice()));
}
return NO_ERROR;
}
EggsError _applyLockCurrentEdge(EggsTime time, rocksdb::WriteBatch& batch, const LockCurrentEdgeEntry& entry, LockCurrentEdgeResp& resp) {
// TODO lots of duplication with _applyUnlockCurrentEdge
uint64_t nameHash;
{
std::string dirValue;
ExternalValue<DirectoryBody> dir;
// allowSnaphsot=false since no current edges in snapshot dirs
EggsError err = _getDirectory({}, entry.dirId, false, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
nameHash = computeHash(dir->hashMode(), entry.name);
}
StaticValue<EdgeKey> currentKey;
currentKey->setDirIdWithCurrent(entry.dirId, true); // current=true
currentKey->setNameHash(nameHash);
currentKey->setName(entry.name);
std::string edgeValue;
{
auto status = _db->Get({}, _edgesCf, currentKey.toSlice(), &edgeValue);
if (status.IsNotFound()) {
return EggsError::EDGE_NOT_FOUND;
}
ROCKS_DB_CHECKED(status);
}
ExternalValue<CurrentEdgeBody> edge(edgeValue);
if (!edge->locked()) {
edge->setTargetIdWithLocked(InodeIdExtra(entry.targetId, true)); // locked=true
ROCKS_DB_CHECKED(batch.Put(_edgesCf, currentKey.toSlice(), edge.toSlice()));
}
return NO_ERROR;
}
EggsError _applyRemoveDirectoryOwner(EggsTime time, rocksdb::WriteBatch& batch, const RemoveDirectoryOwnerEntry& entry, RemoveDirectoryOwnerResp& resp) {
std::string dirValue;
ExternalValue<DirectoryBody> dir;
{
// allowSnapshot=true for idempotency (see below)
EggsError err = _initiateDirectoryModification(time, batch, entry.dirId, true, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
if (dir->ownerId() == NULL_INODE_ID) {
return NO_ERROR; // already done
}
}
// if we have any current edges, we can't proceed
{
StaticValue<EdgeKey> edgeKey;
edgeKey->setDirIdWithCurrent(entry.dirId, true); // current=true
edgeKey->setNameHash(0);
edgeKey->setName({});
WrappedIterator it(_db->NewIterator({}, _edgesCf));
it->Seek(edgeKey.toSlice());
if (it->Valid()) {
auto otherEdge = ExternalValue<EdgeKey>::FromSlice(it->key());
if (otherEdge->dirId() == entry.dirId && otherEdge->current()) {
return EggsError::DIRECTORY_NOT_EMPTY;
}
} else if (it->status().IsNotFound()) {
// nothing to do
} else {
ROCKS_DB_CHECKED(it->status());
}
}
// we need to create a new DirectoryBody, the materialized info might have changed size
{
StaticValue<DirectoryBody> newDir;
newDir->setOwnerId(NULL_INODE_ID);
newDir->setMtime(time);
newDir->setHashMode(dir->hashMode());
newDir->setInfoInherited(dir->infoInherited());
newDir->setInfo(entry.info);
// std::cerr << "setting info to " << entry.info << std::endl;
auto k = InodeIdKey::Static(entry.dirId);
ROCKS_DB_CHECKED(batch.Put(_directoriesCf, k.toSlice(), newDir.toSlice()));
}
return NO_ERROR;
}
EggsError _applyRemoveInode(EggsTime time, rocksdb::WriteBatch& batch, const RemoveInodeEntry& entry, RemoveInodeResp& resp) {
if (entry.id.type() == InodeType::DIRECTORY) {
std::string dirValue;
ExternalValue<DirectoryBody> dir;
{
EggsError err = _getDirectory({}, entry.id, true, dirValue, dir);
if (err == EggsError::DIRECTORY_NOT_FOUND) {
return NO_ERROR; // we're already done
}
if (err != NO_ERROR) {
return err;
}
}
if (dir->ownerId() != NULL_INODE_ID) {
return EggsError::DIRECTORY_HAS_OWNER;
}
// there can't be any outgoing edges when killing a directory definitively
{
StaticValue<EdgeKey> edgeKey;
edgeKey->setDirIdWithCurrent(entry.id, false);
edgeKey->setNameHash(0);
edgeKey->setName({});
edgeKey->setCreationTime(0);
WrappedIterator it(_db->NewIterator({}, _edgesCf));
it->Seek(edgeKey.toSlice());
if (it->Valid()) {
auto otherEdge = ExternalValue<EdgeKey>::FromSlice(it->key());
if (otherEdge->dirId() == entry.id) {
return EggsError::DIRECTORY_NOT_EMPTY;
}
} else if (it->status().IsNotFound()) {
// nothing to do
} else {
ROCKS_DB_CHECKED(it->status());
}
}
// we can finally delete
{
auto dirKey = InodeIdKey::Static(entry.id);
ROCKS_DB_CHECKED(batch.Delete(_directoriesCf, dirKey.toSlice()));
}
} else {
ALWAYS_ASSERT(entry.id.type() == InodeType::FILE || entry.id.type() == InodeType::DIRECTORY);
// we demand for the file to be transient, for the deadline to have passed, and for it to have
// no spans
{
std::string transientFileValue;
ExternalValue<TransientFileBody> transientFile;
EggsError err = _getTransientFile({}, time, true /*allowPastDeadline*/, entry.id, transientFileValue, transientFile);
if (err == EggsError::FILE_NOT_FOUND) {
std::string fileValue;
ExternalValue<FileBody> file;
EggsError err = _getFile({}, entry.id, fileValue, file);
if (err == NO_ERROR) {
return EggsError::FILE_IS_NOT_TRANSIENT;
} else if (err == EggsError::FILE_NOT_FOUND) {
return EggsError::FILE_NOT_FOUND;
} else {
return err;
}
} else if (err == NO_ERROR) {
// keep going
} else {
return err;
}
// check deadline
if (transientFile->deadline() >= time) {
return EggsError::DEADLINE_NOT_PASSED;
}
// check no spans
{
StaticValue<SpanKey> spanKey;
spanKey->setId(entry.id);
spanKey->setOffset(0);
WrappedIterator it(_db->NewIterator({}, _spansCf));
it->Seek(spanKey.toSlice());
if (it->Valid()) {
auto otherSpan = ExternalValue<SpanKey>::FromSlice(it->value());
if (otherSpan->id() == entry.id) {
return EggsError::FILE_NOT_EMPTY;
}
} else if (it->status().IsNotFound()) {
// nothing to do
} else {
ROCKS_DB_CHECKED(it->status());
}
}
}
// we can finally delete
{
auto fileKey = InodeIdKey::Static(entry.id);
ROCKS_DB_CHECKED(batch.Delete(_transientCf, fileKey.toSlice()));
}
}
return NO_ERROR;
}
EggsError _applySetDirectoryOwner(EggsTime time, rocksdb::WriteBatch& batch, const SetDirectoryOwnerEntry& entry, SetDirectoryOwnerResp& resp) {
std::string dirValue;
ExternalValue<DirectoryBody> dir;
{
EggsError err = _initiateDirectoryModification(time, batch, entry.dirId, true, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
}
// set the owner, and restore the directory entry if needed.
StaticValue<DirectoryBody> newDir;
newDir->setOwnerId(entry.ownerId);
newDir->setMtime(dir->mtime());
newDir->setHashMode(dir->hashMode());
newDir->setInfoInherited(dir->infoInherited());
// remove directory info if it was inherited, now that we have an
// owner again.
if (dir->infoInherited()) {
newDir->setInfo({});
}
{
auto k = InodeIdKey::Static(entry.dirId);
ROCKS_DB_CHECKED(batch.Put(_directoriesCf, k.toSlice(), newDir.toSlice()));
}
return NO_ERROR;
}
EggsError _applySetDirectoryInfo(EggsTime time, rocksdb::WriteBatch& batch, const SetDirectoryInfoEntry& entry, SetDirectoryInfoResp& resp) {
std::string dirValue;
ExternalValue<DirectoryBody> dir;
{
EggsError err = _initiateDirectoryModification(time, batch, entry.dirId, false, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
}
StaticValue<DirectoryBody> newDir;
newDir->setOwnerId(dir->ownerId());
newDir->setMtime(dir->mtime());
newDir->setHashMode(dir->hashMode());
newDir->setInfoInherited(entry.info.inherited);
// For snapshot directories, we need to preserve the last known info if inherited.
// It'll be reset when it's made non-snapshot again.
if (!entry.info.inherited || (dir->ownerId() != NULL_INODE_ID)) {
newDir->setInfo(entry.info.body);
}
{
auto k = InodeIdKey::Static(entry.dirId);
ROCKS_DB_CHECKED(batch.Put(_directoriesCf, k.toSlice(), newDir.toSlice()));
}
return NO_ERROR;
}
EggsError _applyRemoveNonOwnedEdge(EggsTime time, rocksdb::WriteBatch& batch, const RemoveNonOwnedEdgeEntry& entry, RemoveNonOwnedEdgeResp& resp) {
uint64_t nameHash;
{
std::string dirValue;
ExternalValue<DirectoryBody> dir;
// allowSnapshot=true since GC needs to be able to remove non-owned edges from snapshot dir
EggsError err = _initiateDirectoryModification(time, batch, entry.dirId, true, dirValue, dir);
if (err != NO_ERROR) {
return err;
}
nameHash = computeHash(dir->hashMode(), entry.name);
}
{
StaticValue<EdgeKey> k;
k->setDirIdWithCurrent(entry.dirId, false); // snapshot (current=false), we're deleting a non owned snapshot edge
k->setNameHash(nameHash);
k->setName(entry.name);
k->setCreationTime(entry.creationTime);
ROCKS_DB_CHECKED(batch.Delete(_edgesCf, k.toSlice()));
}
return NO_ERROR;
}
EggsError _applyIntraShardHardFileUnlink(EggsTime time, rocksdb::WriteBatch& batch, const IntraShardHardFileUnlinkEntry& entry, IntraShardHardFileUnlinkResp& resp) {
// fetch the file
std::string fileValue;
ExternalValue<FileBody> file;
{
EggsError err = _getFile({}, entry.targetId, fileValue, file);
if (err == EggsError::FILE_NOT_FOUND) {
// if the file is already transient, we're done
std::string transientFileValue;
ExternalValue<TransientFileBody> transientFile;
EggsError err = _getTransientFile({}, time, true, entry.targetId, fileValue, transientFile);
if (err == NO_ERROR) {
return NO_ERROR;
} else if (err == EggsError::FILE_NOT_FOUND) {
return EggsError::FILE_NOT_FOUND;
} else {
return err;
}
} else if (err != NO_ERROR) {
return err;
}
}
// fetch dir, compute hash
uint64_t nameHash;
{
std::string dirValue;
ExternalValue<DirectoryBody> dir;
// allowSnapshot=true since GC needs to be able to do this in snapshot dirs
EggsError err = _initiateDirectoryModification(time, batch, entry.ownerId, true, dirValue, dir);
nameHash = computeHash(dir->hashMode(), entry.name);
}
// remove edge
{
StaticValue<EdgeKey> k;
k->setDirIdWithCurrent(entry.ownerId, false);
k->setNameHash(nameHash);
k->setName(entry.name);
k->setCreationTime(entry.creationTime);
ROCKS_DB_CHECKED(batch.Delete(_edgesCf, k.toSlice()));
}
// make file transient
{
auto k = InodeIdKey::Static(entry.targetId);
ROCKS_DB_CHECKED(batch.Delete(_filesCf, k.toSlice()));
StaticValue<TransientFileBody> v;
v->setFileSize(file->fileSize());
v->setMtime(time);
v->setDeadline(0);
v->setLastSpanState(SpanState::CLEAN);
v->setNote(entry.name);
ROCKS_DB_CHECKED(batch.Put(_transientCf, k.toSlice(), v.toSlice()));
}
return NO_ERROR;
}
EggsError _applyRemoveSpanInitiate(EggsTime time, rocksdb::WriteBatch& batch, const RemoveSpanInitiateEntry& entry, RemoveSpanInitiateResp& resp) {
// TODO, just to make the GC integration tests pass for now
return EggsError::FILE_EMPTY;
}
EggsError applyLogEntry(bool sync, uint64_t logIndex, const ShardLogEntry& logEntry, BincodeBytesScratchpad& scratch, ShardRespContainer& resp) {
// TODO figure out the story with what regards time monotonicity (possibly drop non-monotonic log
// updates?)
LOG_DEBUG(_env, "applying log at index %s", logIndex);
auto locked = _applyLogEntryLock.lock();
scratch.reset();
resp.clear();
EggsError err = NO_ERROR;
rocksdb::WriteBatch batch;
_advanceLastAppliedLogEntry(batch, logIndex);
// We set this savepoint since we still want to record the log index advancement
// even if the application does _not_ go through.
//
// This gives us the freedom to write freely in the specific _apply* functions below,
// and fail midway, without worrying that we could write an inconsistent state, since
// it's all rolled back.
batch.SetSavePoint();
std::string entryScratch;
EggsTime time = logEntry.time;
const auto& logEntryBody = logEntry.body;
LOG_DEBUG(_env, "about to apply log entry %s", logEntryBody);
switch (logEntryBody.kind()) {
case ShardLogEntryKind::CONSTRUCT_FILE:
err = _applyConstructFile(batch, time, logEntryBody.getConstructFile(), scratch, resp.setConstructFile());
break;
case ShardLogEntryKind::LINK_FILE:
err = _applyLinkFile(batch, time, logEntryBody.getLinkFile(), scratch, resp.setLinkFile());
break;
case ShardLogEntryKind::SAME_DIRECTORY_RENAME:
err = _applySameDirectoryRename(time, batch, logEntryBody.getSameDirectoryRename(), resp.setSameDirectoryRename());
break;
case ShardLogEntryKind::SOFT_UNLINK_FILE:
err = _applySoftUnlinkFile(time, batch, logEntryBody.getSoftUnlinkFile(), resp.setSoftUnlinkFile());
break;
case ShardLogEntryKind::CREATE_DIRECTORY_INODE:
err = _applyCreateDirectoryInode(time, batch, logEntryBody.getCreateDirectoryInode(), resp.setCreateDirectoryInode());
break;
case ShardLogEntryKind::CREATE_LOCKED_CURRENT_EDGE:
err = _applyCreateLockedCurrentEdge(time, batch, logEntryBody.getCreateLockedCurrentEdge(), resp.setCreateLockedCurrentEdge());
break;
case ShardLogEntryKind::UNLOCK_CURRENT_EDGE:
err = _applyUnlockCurrentEdge(time, batch, logEntryBody.getUnlockCurrentEdge(), resp.setUnlockCurrentEdge());
break;
case ShardLogEntryKind::LOCK_CURRENT_EDGE:
err = _applyLockCurrentEdge(time, batch, logEntryBody.getLockCurrentEdge(), resp.setLockCurrentEdge());
break;
case ShardLogEntryKind::REMOVE_DIRECTORY_OWNER:
err = _applyRemoveDirectoryOwner(time, batch, logEntryBody.getRemoveDirectoryOwner(), resp.setRemoveDirectoryOwner());
break;
case ShardLogEntryKind::REMOVE_INODE:
err = _applyRemoveInode(time, batch, logEntryBody.getRemoveInode(), resp.setRemoveInode());
break;
case ShardLogEntryKind::SET_DIRECTORY_OWNER:
err = _applySetDirectoryOwner(time, batch, logEntryBody.getSetDirectoryOwner(), resp.setSetDirectoryOwner());
break;
case ShardLogEntryKind::SET_DIRECTORY_INFO:
err = _applySetDirectoryInfo(time, batch, logEntryBody.getSetDirectoryInfo(), resp.setSetDirectoryInfo());
break;
case ShardLogEntryKind::REMOVE_NON_OWNED_EDGE:
err = _applyRemoveNonOwnedEdge(time, batch, logEntryBody.getRemoveNonOwnedEdge(), resp.setRemoveNonOwnedEdge());
break;
case ShardLogEntryKind::INTRA_SHARD_HARD_FILE_UNLINK:
err = _applyIntraShardHardFileUnlink(time, batch, logEntryBody.getIntraShardHardFileUnlink(), resp.setIntraShardHardFileUnlink());
break;
case ShardLogEntryKind::REMOVE_SPAN_INITIATE:
err = _applyRemoveSpanInitiate(time, batch, logEntryBody.getRemoveSpanInitiate(), resp.setRemoveSpanInitiate());
break;
default:
throw EGGS_EXCEPTION("bad log entry kind %s", logEntryBody.kind());
}
if (err != NO_ERROR) {
LOG_INFO(_env, "could not apply log entry %s, index %s, because of err %s", logEntryBody.kind(), logIndex, err);
batch.RollbackToSavePoint();
} else {
LOG_DEBUG(_env, "applied log entry of kind %s, index %s, writing changes", logEntryBody.kind(), logIndex);
}
{
rocksdb::WriteOptions options;
options.sync = sync;
ROCKS_DB_CHECKED(_db->Write(options, &batch));
}
return err;
}
// ----------------------------------------------------------------
// miscellanea
void _calcCookie(InodeId id, std::array<uint8_t, 8>& cookie) {
cbcmac(_secretKey, (const uint8_t*)&id, sizeof(id), cookie);
}
uint64_t _lastAppliedLogEntry() {
std::string value;
ROCKS_DB_CHECKED(_db->Get({}, shardMetadataKey(&LAST_APPLIED_LOG_ENTRY_KEY), &value));
ExternalValue<U64Value> v(value);
return v->u64();
}
EggsError _getDirectory(const rocksdb::ReadOptions& options, InodeId id, bool allowSnapshot, std::string& dirValue, ExternalValue<DirectoryBody>& dir) {
if (unlikely(id.type() != InodeType::DIRECTORY)) {
return EggsError::TYPE_IS_NOT_DIRECTORY;
}
auto k = InodeIdKey::Static(id);
auto status = _db->Get(options, _directoriesCf, k.toSlice(), &dirValue);
if (status.IsNotFound()) {
return EggsError::DIRECTORY_NOT_FOUND;
}
ROCKS_DB_CHECKED(status);
auto tmpDir = ExternalValue<DirectoryBody>(dirValue);
if (!allowSnapshot && (tmpDir->ownerId() == NULL_INODE_ID && id != ROOT_DIR_INODE_ID)) { // root dir never has an owner
return EggsError::DIRECTORY_NOT_FOUND;
}
dir = tmpDir;
return NO_ERROR;
}
EggsError _getFile(const rocksdb::ReadOptions& options, InodeId id, std::string& fileValue, ExternalValue<FileBody>& file) {
if (unlikely(id.type() != InodeType::FILE && id.type() != InodeType::SYMLINK)) {
return EggsError::TYPE_IS_DIRECTORY;
}
auto k = InodeIdKey::Static(id);
auto status = _db->Get(options, _filesCf, k.toSlice(), &fileValue);
if (status.IsNotFound()) {
return EggsError::FILE_NOT_FOUND;
}
ROCKS_DB_CHECKED(status);
file = ExternalValue<FileBody>(fileValue);
return NO_ERROR;
}
EggsError _getTransientFile(const rocksdb::ReadOptions& options, EggsTime time, bool allowPastDeadline, InodeId id, std::string& value, ExternalValue<TransientFileBody>& file) {
if (id.type() != InodeType::FILE && id.type() != InodeType::SYMLINK) {
return EggsError::TYPE_IS_DIRECTORY;
}
auto k = InodeIdKey::Static(id);
auto status = _db->Get(options, _transientCf, k.toSlice(), &value);
if (status.IsNotFound()) {
return EggsError::FILE_NOT_FOUND;
}
ROCKS_DB_CHECKED(status);
auto tmpFile = ExternalValue<TransientFileBody>(value);
if (!allowPastDeadline && time > tmpFile->deadline()) {
// this should be fairly uncommon
LOG_INFO(_env, "not picking up transient file %s since its deadline %s is past the log entry time %s", id, tmpFile->deadline(), time);
return EggsError::FILE_NOT_FOUND;
}
file = tmpFile;
return NO_ERROR;
}
};
BincodeBytes defaultDirectoryInfo(char (&buf)[255]) {
DirectoryInfoBody info;
// delete after 30 days
info.deleteAfterTime = 30ull /*days*/ * 24 /*hours*/ * 60 /*minutes*/ * 60 /*seconds*/ * 1'000'000'000 /*ns*/;
// do not delete after N versions
info.deleteAfterVersions = 0;
// up to 1MiB flash, up to 10MiB HDD (should be 100MiB really, it's nicer to test with smaller
// spans now).
auto& flashPolicy = info.spanPolicies.els.emplace_back();
flashPolicy.maxSize = 1ull << 20; // 1MiB
flashPolicy.storageClass = storageClassByName("FLASH");
flashPolicy.parity = Parity(1, 1); // RAID1
auto& hddPolicy = info.spanPolicies.els.emplace_back();
hddPolicy.maxSize = 10ull << 20; // 10MiB
hddPolicy.storageClass = storageClassByName("HDD");
hddPolicy.parity = Parity(1, 1); // RAID1
BincodeBuf bbuf(buf, 255);
info.pack(bbuf);
return BincodeBytes(buf, bbuf.len());
}
bool readOnlyShardReq(const ShardMessageKind kind) {
switch (kind) {
case ShardMessageKind::LOOKUP:
case ShardMessageKind::STAT_FILE:
case ShardMessageKind::STAT_TRANSIENT_FILE:
case ShardMessageKind::STAT_DIRECTORY:
case ShardMessageKind::READ_DIR:
case ShardMessageKind::FULL_READ_DIR:
case ShardMessageKind::FILE_SPANS:
case ShardMessageKind::VISIT_DIRECTORIES:
case ShardMessageKind::VISIT_FILES:
case ShardMessageKind::VISIT_TRANSIENT_FILES:
case ShardMessageKind::BLOCK_SERVICE_FILES:
return true;
case ShardMessageKind::CONSTRUCT_FILE:
case ShardMessageKind::ADD_SPAN_INITIATE:
case ShardMessageKind::ADD_SPAN_CERTIFY:
case ShardMessageKind::LINK_FILE:
case ShardMessageKind::SOFT_UNLINK_FILE:
case ShardMessageKind::SAME_DIRECTORY_RENAME:
case ShardMessageKind::SET_DIRECTORY_INFO:
case ShardMessageKind::REMOVE_NON_OWNED_EDGE:
case ShardMessageKind::INTRA_SHARD_HARD_FILE_UNLINK:
case ShardMessageKind::REMOVE_SPAN_INITIATE:
case ShardMessageKind::REMOVE_SPAN_CERTIFY:
case ShardMessageKind::SWAP_BLOCKS:
case ShardMessageKind::CREATE_DIRECTORY_INODE:
case ShardMessageKind::SET_DIRECTORY_OWNER:
case ShardMessageKind::REMOVE_DIRECTORY_OWNER:
case ShardMessageKind::CREATE_LOCKED_CURRENT_EDGE:
case ShardMessageKind::LOCK_CURRENT_EDGE:
case ShardMessageKind::UNLOCK_CURRENT_EDGE:
case ShardMessageKind::REMOVE_INODE:
case ShardMessageKind::REMOVE_OWNED_SNAPSHOT_FILE_EDGE:
case ShardMessageKind::MAKE_FILE_TRANSIENT:
return false;
case ShardMessageKind::ERROR:
throw EGGS_EXCEPTION("unexpected ERROR shard message kind");
}
throw EGGS_EXCEPTION("bad message kind %s", kind);
}
ShardDB::ShardDB(Env& env, ShardId shid, const std::string& path) {
_impl = new ShardDBImpl(env, shid, path);
}
void ShardDB::close() {
((ShardDBImpl*)_impl)->close();
}
ShardDB::~ShardDB() {
delete (ShardDBImpl*)_impl;
_impl = nullptr;
}
EggsError ShardDB::read(const ShardReqContainer& req, BincodeBytesScratchpad& scratch, ShardRespContainer& resp) {
return ((ShardDBImpl*)_impl)->read(req, scratch, resp);
}
EggsError ShardDB::prepareLogEntry(const ShardReqContainer& req, BincodeBytesScratchpad& scratch, ShardLogEntry& logEntry) {
return ((ShardDBImpl*)_impl)->prepareLogEntry(req, scratch, logEntry);
}
EggsError ShardDB::applyLogEntry(bool sync, uint64_t logEntryIx, const ShardLogEntry& logEntry, BincodeBytesScratchpad& scratch, ShardRespContainer& resp) {
return ((ShardDBImpl*)_impl)->applyLogEntry(sync, logEntryIx, logEntry, scratch, resp);
}
uint64_t ShardDB::lastAppliedLogEntry() {
return ((ShardDBImpl*)_impl)->_lastAppliedLogEntry();
}
const std::array<uint8_t, 16>& ShardDB::secretKey() const {
return ((ShardDBImpl*)_impl)->_secretKey;
}
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