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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "Firestore/Source/Local/FSTWriteGroup.h"
#import <Protobuf/GPBProtocolBuffers.h>
#include <leveldb/db.h>
#include <leveldb/write_batch.h>
#import "Firestore/Source/Local/FSTLevelDBKey.h"
#import "Firestore/Source/Util/FSTAssert.h"
using Firestore::StringView;
using leveldb::DB;
using leveldb::Slice;
using leveldb::Status;
using leveldb::WriteBatch;
using leveldb::WriteOptions;
NS_ASSUME_NONNULL_BEGIN
namespace Firestore {
/**
* A WriteBatch::Handler implementation that extracts batch details from a leveldb::WriteBatch.
* This is used for describing a write batch primarily in log messages after a failure.
*/
class BatchDescription : public WriteBatch::Handler {
public:
BatchDescription() : ops_(0), size_(0), message_([NSMutableString string]) {
}
virtual ~BatchDescription();
virtual void Put(const Slice &key, const Slice &value);
virtual void Delete(const Slice &key);
// Converts the batch to a printable string description of it
NSString *ToString() const {
return [NSString
stringWithFormat:@"%d changes (%lu bytes):%@", ops_, (unsigned long)size_, message_];
}
// Disallow copies and moves
BatchDescription(const BatchDescription &) = delete;
BatchDescription &operator=(const BatchDescription &) = delete;
BatchDescription(BatchDescription &&) = delete;
BatchDescription &operator=(BatchDescription &&) = delete;
private:
int ops_;
size_t size_;
NSMutableString *message_;
};
BatchDescription::~BatchDescription() {
}
void BatchDescription::Put(const Slice &key, const Slice &value) {
ops_ += 1;
size_ += value.size();
[message_ appendFormat:@"\n - Put %@ (%lu bytes)", [FSTLevelDBKey descriptionForKey:key],
(unsigned long)value.size()];
}
void BatchDescription::Delete(const Slice &key) {
ops_ += 1;
[message_ appendFormat:@"\n - Delete %@", [FSTLevelDBKey descriptionForKey:key]];
}
} // namespace Firestore
@interface FSTWriteGroup ()
- (instancetype)initWithAction:(NSString *)action NS_DESIGNATED_INITIALIZER;
@end
@implementation FSTWriteGroup {
int _changes;
WriteBatch _contents;
}
+ (instancetype)groupWithAction:(NSString *)action {
return [[FSTWriteGroup alloc] initWithAction:action];
}
- (instancetype)initWithAction:(NSString *)action {
if (self = [super init]) {
_action = action;
}
return self;
}
- (NSString *)description {
Firestore::BatchDescription description;
Status status = _contents.Iterate(&description);
if (!status.ok()) {
FSTFail(@"Iterate over write batch should not fail");
}
return [NSString
stringWithFormat:@"<FSTWriteGroup for %@: %@>", self.action, description.ToString()];
}
- (void)removeMessageForKey:(StringView)key {
_contents.Delete(key);
_changes += 1;
}
- (void)setMessage:(GPBMessage *)message forKey:(StringView)key {
NSData *data = [message data];
Slice value((const char *)data.bytes, data.length);
_contents.Put(key, value);
_changes += 1;
}
- (void)setData:(StringView)data forKey:(StringView)key {
_contents.Put(key, data);
_changes += 1;
}
- (leveldb::Status)writeToDB:(std::shared_ptr<leveldb::DB>)db {
return db->Write(leveldb::WriteOptions(), &_contents);
}
- (BOOL)isEmpty {
return _changes == 0;
}
@end
NS_ASSUME_NONNULL_END
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