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#include "caffe2/core/db.h"
#include <mutex>
#include "caffe2/core/blob_serialization.h"
#include "caffe2/core/logging.h"
namespace caffe2 {
CAFFE_KNOWN_TYPE(db::DBReader);
CAFFE_KNOWN_TYPE(db::Cursor);
namespace db {
C10_DEFINE_REGISTRY(Caffe2DBRegistry, DB, const string&, Mode);
// Below, we provide a bare minimum database "minidb" as a reference
// implementation as well as a portable choice to store data.
// Note that the MiniDB classes are not exposed via a header file - they should
// be created directly via the db interface. See MiniDB for details.
class MiniDBCursor : public Cursor {
public:
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
explicit MiniDBCursor(FILE* f, std::mutex* mutex)
: file_(f), lock_(*mutex), valid_(true) {
// We call Next() to read in the first entry.
// NOLINTNEXTLINE(clang-analyzer-optin.cplusplus.VirtualCall)
Next();
}
// NOLINTNEXTLINE(modernize-use-equals-default)
~MiniDBCursor() override {}
void Seek(const string& /*key*/) override {
LOG(FATAL) << "MiniDB does not support seeking to a specific key.";
}
void SeekToFirst() override {
fseek(file_, 0, SEEK_SET);
CAFFE_ENFORCE(!feof(file_), "Hmm, empty file?");
// Read the first item.
valid_ = true;
Next();
}
void Next() override {
// First, read in the key and value length.
if (fread(&key_len_, sizeof(int), 1, file_) == 0) {
// Reaching EOF.
VLOG(1) << "EOF reached, setting valid to false";
valid_ = false;
return;
}
CAFFE_ENFORCE_EQ(fread(&value_len_, sizeof(int), 1, file_), 1);
CAFFE_ENFORCE_GT(key_len_, 0);
CAFFE_ENFORCE_GT(value_len_, 0);
// Resize if the key and value len is larger than the current one.
if (key_len_ > (int)key_.size()) {
key_.resize(key_len_);
}
if (value_len_ > (int)value_.size()) {
value_.resize(value_len_);
}
// Actually read in the contents.
CAFFE_ENFORCE_EQ(
fread(key_.data(), sizeof(char), key_len_, file_), key_len_);
CAFFE_ENFORCE_EQ(
fread(value_.data(), sizeof(char), value_len_, file_), value_len_);
// Note(Yangqing): as we read the file, the cursor naturally moves to the
// beginning of the next entry.
}
string key() override {
CAFFE_ENFORCE(valid_, "Cursor is at invalid location!");
return string(key_.data(), key_len_);
}
string value() override {
CAFFE_ENFORCE(valid_, "Cursor is at invalid location!");
return string(value_.data(), value_len_);
}
bool Valid() override {
return valid_;
}
private:
FILE* file_;
std::lock_guard<std::mutex> lock_;
bool valid_;
int key_len_;
vector<char> key_;
int value_len_;
vector<char> value_;
};
class MiniDBTransaction : public Transaction {
public:
explicit MiniDBTransaction(FILE* f, std::mutex* mutex)
: file_(f), lock_(*mutex) {}
~MiniDBTransaction() override {
// NOLINTNEXTLINE(clang-analyzer-optin.cplusplus.VirtualCall)
Commit();
}
void Put(const string& key, string&& value) override {
int key_len = key.size();
int value_len = value.size();
CAFFE_ENFORCE_EQ(fwrite(&key_len, sizeof(int), 1, file_), 1);
CAFFE_ENFORCE_EQ(fwrite(&value_len, sizeof(int), 1, file_), 1);
CAFFE_ENFORCE_EQ(
fwrite(key.c_str(), sizeof(char), key_len, file_), key_len);
CAFFE_ENFORCE_EQ(
fwrite(value.c_str(), sizeof(char), value_len, file_), value_len);
}
void Commit() override {
if (file_ != nullptr) {
CAFFE_ENFORCE_EQ(fflush(file_), 0);
file_ = nullptr;
}
}
private:
FILE* file_;
std::lock_guard<std::mutex> lock_;
C10_DISABLE_COPY_AND_ASSIGN(MiniDBTransaction);
};
class MiniDB : public DB {
public:
MiniDB(const string& source, Mode mode) : DB(source, mode), file_(nullptr) {
switch (mode) {
case NEW:
file_ = fopen(source.c_str(), "wb");
break;
case WRITE:
file_ = fopen(source.c_str(), "ab");
fseek(file_, 0, SEEK_END);
break;
case READ:
file_ = fopen(source.c_str(), "rb");
break;
}
CAFFE_ENFORCE(file_, "Cannot open file: " + source);
VLOG(1) << "Opened MiniDB " << source;
}
~MiniDB() override {
// NOLINTNEXTLINE(clang-analyzer-optin.cplusplus.VirtualCall)
Close();
}
void Close() override {
if (file_) {
fclose(file_);
}
file_ = nullptr;
}
unique_ptr<Cursor> NewCursor() override {
CAFFE_ENFORCE_EQ(this->mode_, READ);
return make_unique<MiniDBCursor>(file_, &file_access_mutex_);
}
unique_ptr<Transaction> NewTransaction() override {
CAFFE_ENFORCE(this->mode_ == NEW || this->mode_ == WRITE);
return make_unique<MiniDBTransaction>(file_, &file_access_mutex_);
}
private:
FILE* file_;
// access mutex makes sure we don't have multiple cursors/transactions
// reading the same file.
std::mutex file_access_mutex_;
};
REGISTER_CAFFE2_DB(MiniDB, MiniDB);
REGISTER_CAFFE2_DB(minidb, MiniDB);
void DBReaderSerializer::Serialize(
const void* pointer,
TypeMeta typeMeta,
const string& name,
BlobSerializerBase::SerializationAcceptor acceptor) {
CAFFE_ENFORCE(typeMeta.Match<DBReader>());
const auto& reader = *static_cast<const DBReader*>(pointer);
DBReaderProto proto;
proto.set_name(name);
proto.set_source(reader.source_);
proto.set_db_type(reader.db_type_);
if (reader.cursor() && reader.cursor()->SupportsSeek()) {
proto.set_key(reader.cursor()->key());
}
BlobProto blob_proto;
blob_proto.set_name(name);
blob_proto.set_type("DBReader");
blob_proto.set_content(SerializeAsString_EnforceCheck(proto));
acceptor(name, SerializeBlobProtoAsString_EnforceCheck(blob_proto));
}
void DBReaderDeserializer::Deserialize(const BlobProto& proto, Blob* blob) {
DBReaderProto reader_proto;
CAFFE_ENFORCE(
reader_proto.ParseFromString(proto.content()),
"Cannot parse content into a DBReaderProto.");
blob->Reset(new DBReader(reader_proto));
}
namespace {
// Serialize TensorCPU.
REGISTER_BLOB_SERIALIZER((TypeMeta::Id<DBReader>()), DBReaderSerializer);
REGISTER_BLOB_DESERIALIZER(DBReader, DBReaderDeserializer);
} // namespace
} // namespace db
} // namespace caffe2
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