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rocksdb/utilities/ttl/db_ttl_impl.cc

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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef ROCKSDB_LITE
#include "utilities/ttl/db_ttl_impl.h"
#include "db/filename.h"
#include "db/write_batch_internal.h"
#include "rocksdb/convenience.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "rocksdb/utilities/db_ttl.h"
#include "util/coding.h"
namespace rocksdb {
void DBWithTTLImpl::SanitizeOptions(int32_t ttl, ColumnFamilyOptions* options,
Env* env) {
if (options->compaction_filter) {
options->compaction_filter =
new TtlCompactionFilter(ttl, env, options->compaction_filter);
} else {
options->compaction_filter_factory =
std::shared_ptr<CompactionFilterFactory>(new TtlCompactionFilterFactory(
ttl, env, options->compaction_filter_factory));
}
if (options->merge_operator) {
options->merge_operator.reset(
new TtlMergeOperator(options->merge_operator, env));
}
}
// Open the db inside DBWithTTLImpl because options needs pointer to its ttl
DBWithTTLImpl::DBWithTTLImpl(DB* db) : DBWithTTL(db) {}
DBWithTTLImpl::~DBWithTTLImpl() {
// Need to stop background compaction before getting rid of the filter
CancelAllBackgroundWork(db_, /* wait = */ true);
delete GetOptions().compaction_filter;
}
Status UtilityDB::OpenTtlDB(const Options& options, const std::string& dbname,
StackableDB** dbptr, int32_t ttl, bool read_only) {
DBWithTTL* db;
Status s = DBWithTTL::Open(options, dbname, &db, ttl, read_only);
if (s.ok()) {
*dbptr = db;
} else {
*dbptr = nullptr;
}
return s;
}
Status DBWithTTL::Open(const Options& options, const std::string& dbname,
DBWithTTL** dbptr, int32_t ttl, bool read_only) {
DBOptions db_options(options);
ColumnFamilyOptions cf_options(options);
std::vector<ColumnFamilyDescriptor> column_families;
column_families.push_back(
ColumnFamilyDescriptor(kDefaultColumnFamilyName, cf_options));
std::vector<ColumnFamilyHandle*> handles;
Status s = DBWithTTL::Open(db_options, dbname, column_families, &handles,
dbptr, {ttl}, read_only);
if (s.ok()) {
assert(handles.size() == 1);
// i can delete the handle since DBImpl is always holding a reference to
// default column family
delete handles[0];
}
return s;
}
Status DBWithTTL::Open(
const DBOptions& db_options, const std::string& dbname,
const std::vector<ColumnFamilyDescriptor>& column_families,
std::vector<ColumnFamilyHandle*>* handles, DBWithTTL** dbptr,
std::vector<int32_t> ttls, bool read_only) {
if (ttls.size() != column_families.size()) {
return Status::InvalidArgument(
"ttls size has to be the same as number of column families");
}
std::vector<ColumnFamilyDescriptor> column_families_sanitized =
column_families;
for (size_t i = 0; i < column_families_sanitized.size(); ++i) {
DBWithTTLImpl::SanitizeOptions(
ttls[i], &column_families_sanitized[i].options,
db_options.env == nullptr ? Env::Default() : db_options.env);
}
DB* db;
Status st;
if (read_only) {
st = DB::OpenForReadOnly(db_options, dbname, column_families_sanitized,
handles, &db);
} else {
st = DB::Open(db_options, dbname, column_families_sanitized, handles, &db);
}
if (st.ok()) {
*dbptr = new DBWithTTLImpl(db);
} else {
*dbptr = nullptr;
}
return st;
}
Status DBWithTTLImpl::CreateColumnFamilyWithTtl(
const ColumnFamilyOptions& options, const std::string& column_family_name,
ColumnFamilyHandle** handle, int ttl) {
ColumnFamilyOptions sanitized_options = options;
DBWithTTLImpl::SanitizeOptions(ttl, &sanitized_options, GetEnv());
return DBWithTTL::CreateColumnFamily(sanitized_options, column_family_name,
handle);
}
Status DBWithTTLImpl::CreateColumnFamily(const ColumnFamilyOptions& options,
const std::string& column_family_name,
ColumnFamilyHandle** handle) {
return CreateColumnFamilyWithTtl(options, column_family_name, handle, 0);
}
// Appends the current timestamp to the string.
// Returns false if could not get the current_time, true if append succeeds
Status DBWithTTLImpl::AppendTS(const Slice& val, std::string* val_with_ts,
Env* env) {
val_with_ts->reserve(kTSLength + val.size());
char ts_string[kTSLength];
int64_t curtime;
Status st = env->GetCurrentTime(&curtime);
if (!st.ok()) {
return st;
}
EncodeFixed32(ts_string, (int32_t)curtime);
val_with_ts->append(val.data(), val.size());
val_with_ts->append(ts_string, kTSLength);
return st;
}
// Returns corruption if the length of the string is lesser than timestamp, or
// timestamp refers to a time lesser than ttl-feature release time
Status DBWithTTLImpl::SanityCheckTimestamp(const Slice& str) {
if (str.size() < kTSLength) {
return Status::Corruption("Error: value's length less than timestamp's\n");
}
// Checks that TS is not lesser than kMinTimestamp
// Gaurds against corruption & normal database opened incorrectly in ttl mode
int32_t timestamp_value = DecodeFixed32(str.data() + str.size() - kTSLength);
if (timestamp_value < kMinTimestamp) {
return Status::Corruption("Error: Timestamp < ttl feature release time!\n");
}
return Status::OK();
}
// Checks if the string is stale or not according to TTl provided
bool DBWithTTLImpl::IsStale(const Slice& value, int32_t ttl, Env* env) {
if (ttl <= 0) { // Data is fresh if TTL is non-positive
return false;
}
int64_t curtime;
if (!env->GetCurrentTime(&curtime).ok()) {
return false; // Treat the data as fresh if could not get current time
}
int32_t timestamp_value =
DecodeFixed32(value.data() + value.size() - kTSLength);
return (timestamp_value + ttl) < curtime;
}
// Strips the TS from the end of the slice
Status DBWithTTLImpl::StripTS(PinnableSlice* pinnable_val) {
Status st;
if (pinnable_val->size() < kTSLength) {
return Status::Corruption("Bad timestamp in key-value");
}
// Erasing characters which hold the TS
pinnable_val->remove_suffix(kTSLength);
return st;
}
// Strips the TS from the end of the string
Status DBWithTTLImpl::StripTS(std::string* str) {
Status st;
if (str->length() < kTSLength) {
return Status::Corruption("Bad timestamp in key-value");
}
// Erasing characters which hold the TS
str->erase(str->length() - kTSLength, kTSLength);
return st;
}
Status DBWithTTLImpl::Put(const WriteOptions& options,
ColumnFamilyHandle* column_family, const Slice& key,
const Slice& val) {
WriteBatch batch;
batch.Put(column_family, key, val);
return Write(options, &batch);
}
Status DBWithTTLImpl::Get(const ReadOptions& options,
ColumnFamilyHandle* column_family, const Slice& key,
PinnableSlice* value) {
Status st = db_->Get(options, column_family, key, value);
if (!st.ok()) {
return st;
}
st = SanityCheckTimestamp(*value);
if (!st.ok()) {
return st;
}
return StripTS(value);
}
std::vector<Status> DBWithTTLImpl::MultiGet(
const ReadOptions& options,
const std::vector<ColumnFamilyHandle*>& column_family,
const std::vector<Slice>& keys, std::vector<std::string>* values) {
auto statuses = db_->MultiGet(options, column_family, keys, values);
for (size_t i = 0; i < keys.size(); ++i) {
if (!statuses[i].ok()) {
continue;
}
statuses[i] = SanityCheckTimestamp((*values)[i]);
if (!statuses[i].ok()) {
continue;
}
statuses[i] = StripTS(&(*values)[i]);
}
return statuses;
}
bool DBWithTTLImpl::KeyMayExist(const ReadOptions& options,
ColumnFamilyHandle* column_family,
const Slice& key, std::string* value,
bool* value_found) {
bool ret = db_->KeyMayExist(options, column_family, key, value, value_found);
if (ret && value != nullptr && value_found != nullptr && *value_found) {
if (!SanityCheckTimestamp(*value).ok() || !StripTS(value).ok()) {
return false;
}
}
return ret;
}
Status DBWithTTLImpl::Merge(const WriteOptions& options,
ColumnFamilyHandle* column_family, const Slice& key,
const Slice& value) {
WriteBatch batch;
batch.Merge(column_family, key, value);
return Write(options, &batch);
}
Status DBWithTTLImpl::Write(const WriteOptions& opts, WriteBatch* updates) {
class Handler : public WriteBatch::Handler {
public:
explicit Handler(Env* env) : env_(env) {}
WriteBatch updates_ttl;
Status batch_rewrite_status;
virtual Status PutCF(uint32_t column_family_id, const Slice& key,
const Slice& value) override {
std::string value_with_ts;
Status st = AppendTS(value, &value_with_ts, env_);
if (!st.ok()) {
batch_rewrite_status = st;
} else {
WriteBatchInternal::Put(&updates_ttl, column_family_id, key,
value_with_ts);
}
return Status::OK();
}
virtual Status MergeCF(uint32_t column_family_id, const Slice& key,
const Slice& value) override {
std::string value_with_ts;
Status st = AppendTS(value, &value_with_ts, env_);
if (!st.ok()) {
batch_rewrite_status = st;
} else {
WriteBatchInternal::Merge(&updates_ttl, column_family_id, key,
value_with_ts);
}
return Status::OK();
}
virtual Status DeleteCF(uint32_t column_family_id,
const Slice& key) override {
WriteBatchInternal::Delete(&updates_ttl, column_family_id, key);
return Status::OK();
}
virtual void LogData(const Slice& blob) override {
updates_ttl.PutLogData(blob);
}
private:
Env* env_;
};
Handler handler(GetEnv());
updates->Iterate(&handler);
if (!handler.batch_rewrite_status.ok()) {
return handler.batch_rewrite_status;
} else {
return db_->Write(opts, &(handler.updates_ttl));
}
}
Iterator* DBWithTTLImpl::NewIterator(const ReadOptions& opts,
ColumnFamilyHandle* column_family) {
return new TtlIterator(db_->NewIterator(opts, column_family));
}
} // namespace rocksdb
#endif // ROCKSDB_LITE