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fd367e677e
rocksdb/util/ldb_cmd.cc
Dilip Antony Joseph 11ce6a060e Enhanced ldb to support data access commands 
Summary: Added put/get/scan/batchput/delete/approxsize

Test Plan: Added pyunit script to test the newly added commands

Reviewers: chip, leveldb

Reviewed By: chip

CC: zshao, emayanke

Differential Revision: https://reviews.facebook.net/D7947
2013-01-28 11:38:26 -08:00

1077 lines
32 KiB
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// Copyright (c) 2012 Facebook. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <boost/algorithm/string.hpp>
#include <boost/lexical_cast.hpp>
#include "leveldb/write_batch.h"
#include "db/dbformat.h"
#include "db/log_reader.h"
#include "db/write_batch_internal.h"
#include "util/ldb_cmd.h"
namespace leveldb {
const string LDBCommand::ARG_DB = "db";
const string LDBCommand::ARG_HEX = "hex";
const string LDBCommand::ARG_KEY_HEX = "key_hex";
const string LDBCommand::ARG_VALUE_HEX = "value_hex";
const string LDBCommand::ARG_FROM = "from";
const string LDBCommand::ARG_TO = "to";
const string LDBCommand::ARG_MAX_KEYS = "max_keys";
const string LDBCommand::ARG_BLOOM_BITS = "bloom_bits";
const string LDBCommand::ARG_COMPRESSION_TYPE = "compression_type";
const string LDBCommand::ARG_BLOCK_SIZE = "block_size";
const string LDBCommand::ARG_AUTO_COMPACTION = "auto_compaction";
const string LDBCommand::ARG_WRITE_BUFFER_SIZE = "write_buffer_size";
const string LDBCommand::ARG_FILE_SIZE = "file_size";
const string LDBCommand::ARG_CREATE_IF_MISSING = "create_if_missing";
const char* LDBCommand::DELIM = " ==> ";
LDBCommand* LDBCommand::InitFromCmdLineArgs(int argc, char** argv) {
vector<string> args;
for (int i = 1; i < argc; i++) {
args.push_back(argv[i]);
}
return InitFromCmdLineArgs(args);
}
/**
* Parse the command-line arguments and create the appropriate LDBCommand2
* instance.
* The command line arguments must be in the following format:
* ./ldb --db=PATH_TO_DB [--commonOpt1=commonOpt1Val] ..
* COMMAND <PARAM1> <PARAM2> ... [-cmdSpecificOpt1=cmdSpecificOpt1Val] ..
* This is similar to the command line format used by HBaseClientTool.
* Command name is not included in args.
* Returns NULL if the command-line cannot be parsed.
*/
LDBCommand* LDBCommand::InitFromCmdLineArgs(const vector<string>& args) {
// --x=y command line arguments are added as x->y map entries.
map<string, string> options;
// Command-line arguments of the form --hex end up in this array as hex
vector<string> flags;
// Everything other than options and flags. Represents commands
// and their parameters. For eg: put key1 value1 go into this vector.
vector<string> cmdTokens;
const string OPTION_PREFIX = "--";
for (vector<string>::const_iterator itr = args.begin();
itr != args.end(); itr++) {
string arg = *itr;
if (boost::starts_with(arg, OPTION_PREFIX)){
vector<string> splits;
boost::split(splits, arg, boost::is_any_of("="));
if (splits.size() == 2) {
string optionKey = splits[0].substr(OPTION_PREFIX.size());
options[optionKey] = splits[1];
} else {
string optionKey = splits[0].substr(OPTION_PREFIX.size());
flags.push_back(optionKey);
}
} else {
cmdTokens.push_back(string(arg));
}
}
if (cmdTokens.size() < 1) {
fprintf(stderr, "Command not specified!");
return NULL;
}
string cmd = cmdTokens[0];
vector<string> cmdParams(cmdTokens.begin()+1, cmdTokens.end());
if (cmd == GetCommand::Name()) {
return new GetCommand(cmdParams, options, flags);
} else if (cmd == PutCommand::Name()) {
return new PutCommand(cmdParams, options, flags);
} else if (cmd == BatchPutCommand::Name()) {
return new BatchPutCommand(cmdParams, options, flags);
} else if (cmd == ScanCommand::Name()) {
return new ScanCommand(cmdParams, options, flags);
} else if (cmd == DeleteCommand::Name()) {
return new DeleteCommand(cmdParams, options, flags);
} else if (cmd == ApproxSizeCommand::Name()) {
return new ApproxSizeCommand(cmdParams, options, flags);
} else if (cmd == DBQuerierCommand::Name()) {
return new DBQuerierCommand(cmdParams, options, flags);
} else if (cmd == CompactorCommand::Name()) {
return new CompactorCommand(cmdParams, options, flags);
} else if (cmd == WALDumperCommand::Name()) {
return new WALDumperCommand(cmdParams, options, flags);
} else if (cmd == ReduceDBLevelsCommand::Name()) {
return new ReduceDBLevelsCommand(cmdParams, options, flags);
} else if (cmd == DBDumperCommand::Name()) {
return new DBDumperCommand(cmdParams, options, flags);
} else if (cmd == DBLoaderCommand::Name()) {
return new DBLoaderCommand(cmdParams, options, flags);
}
return NULL;
}
/**
* Parses the specific integer option and fills in the value.
* Returns true if the option is found.
* Returns false if the option is not found or if there is an error parsing the
* value. If there is an error, the specified exec_state is also
* updated.
*/
bool LDBCommand::ParseIntOption(const map<string, string>& options,
string option, int& value, LDBCommandExecuteResult& exec_state) {
map<string, string>::const_iterator itr = options_.find(option);
if (itr != options_.end()) {
try {
value = boost::lexical_cast<int>(itr->second);
return true;
} catch( const boost::bad_lexical_cast & ) {
exec_state = LDBCommandExecuteResult::FAILED(option +
" has an invalid value.");
}
}
return false;
}
leveldb::Options LDBCommand::PrepareOptionsForOpenDB() {
leveldb::Options opt;
opt.create_if_missing = false;
map<string, string>::const_iterator itr;
int bits;
if (ParseIntOption(options_, ARG_BLOOM_BITS, bits, exec_state_)) {
if (bits > 0) {
opt.filter_policy = leveldb::NewBloomFilterPolicy(bits);
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(ARG_BLOOM_BITS +
" must be > 0.");
}
}
int block_size;
if (ParseIntOption(options_, ARG_BLOCK_SIZE, block_size, exec_state_)) {
if (block_size > 0) {
opt.block_size = block_size;
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(ARG_BLOCK_SIZE +
" must be > 0.");
}
}
itr = options_.find(ARG_AUTO_COMPACTION);
if (itr != options_.end()) {
opt.disable_auto_compactions = ! StringToBool(itr->second);
}
itr = options_.find(ARG_COMPRESSION_TYPE);
if (itr != options_.end()) {
string comp = itr->second;
if (comp == "no") {
opt.compression = leveldb::kNoCompression;
} else if (comp == "snappy") {
opt.compression = leveldb::kSnappyCompression;
} else if (comp == "zlib") {
opt.compression = leveldb::kZlibCompression;
} else if (comp == "bzip2") {
opt.compression = leveldb::kBZip2Compression;
} else {
// Unknown compression.
exec_state_ = LDBCommandExecuteResult::FAILED(
"Unknown compression level: " + comp);
}
}
int write_buffer_size;
if (ParseIntOption(options_, ARG_WRITE_BUFFER_SIZE, write_buffer_size,
exec_state_)) {
if (write_buffer_size > 0) {
opt.write_buffer_size = write_buffer_size;
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(ARG_WRITE_BUFFER_SIZE +
" must be > 0.");
}
}
int file_size;
if (ParseIntOption(options_, ARG_FILE_SIZE, file_size, exec_state_)) {
if (file_size > 0) {
opt.target_file_size_base = file_size;
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(ARG_FILE_SIZE +
" must be > 0.");
}
}
return opt;
}
bool LDBCommand::ParseKeyValue(const string& line, string* key, string* value,
bool is_key_hex, bool is_value_hex) {
size_t pos = line.find(DELIM);
if (pos != std::string::npos) {
*key = line.substr(0, pos);
*value = line.substr(pos + strlen(DELIM));
if (is_key_hex) {
*key = HexToString(*key);
}
if (is_value_hex) {
*value = HexToString(*value);
}
return true;
} else {
return false;
}
}
/**
* Make sure that ONLY the command-line options and flags expected by this
* command are specified on the command-line. Extraneous options are usually
* the result of user error.
* Returns true if all checks pass. Else returns false, and prints an
* appropriate error msg to stderr.
*/
bool LDBCommand::ValidateCmdLineOptions() {
for (map<string, string>::const_iterator itr = options_.begin();
itr != options_.end(); itr++) {
if (std::find(valid_cmd_line_options_.begin(),
valid_cmd_line_options_.end(), itr->first) ==
valid_cmd_line_options_.end()) {
fprintf(stderr, "Invalid command-line option %s\n", itr->first.c_str());
return false;
}
}
for (vector<string>::const_iterator itr = flags_.begin();
itr != flags_.end(); itr++) {
if (std::find(valid_cmd_line_options_.begin(),
valid_cmd_line_options_.end(), *itr) ==
valid_cmd_line_options_.end()) {
fprintf(stderr, "Invalid command-line flag %s\n", itr->c_str());
return false;
}
}
if (options_.find(ARG_DB) == options_.end()) {
fprintf(stderr, "%s must be specified\n", ARG_DB.c_str());
return false;
}
return true;
}
CompactorCommand::CompactorCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, false,
BuildCmdLineOptions({ARG_FROM, ARG_TO, ARG_HEX, ARG_KEY_HEX,
ARG_VALUE_HEX})),
null_from_(true), null_to_(true) {
map<string, string>::const_iterator itr = options.find(ARG_FROM);
if (itr != options.end()) {
null_from_ = false;
from_ = itr->second;
}
itr = options.find(ARG_TO);
if (itr != options.end()) {
null_to_ = false;
to_ = itr->second;
}
if (is_key_hex_) {
if (!null_from_) {
from_ = HexToString(from_);
}
if (!null_to_) {
to_ = HexToString(to_);
}
}
}
void CompactorCommand::Help(string& ret) {
ret.append(" ");
ret.append(CompactorCommand::Name());
ret.append(HelpRangeCmdArgs());
ret.append("\n");
}
void CompactorCommand::DoCommand() {
leveldb::Slice* begin = NULL;
leveldb::Slice* end = NULL;
if (!null_from_) {
begin = new leveldb::Slice(from_);
}
if (!null_to_) {
end = new leveldb::Slice(to_);
}
db_->CompactRange(begin, end);
exec_state_ = LDBCommandExecuteResult::SUCCEED("");
delete begin;
delete end;
}
const string DBLoaderCommand::ARG_DISABLE_WAL = "disable_wal";
DBLoaderCommand::DBLoaderCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, false,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX,
ARG_FROM, ARG_TO, ARG_CREATE_IF_MISSING,
ARG_DISABLE_WAL})),
create_if_missing_(false) {
create_if_missing_ = IsFlagPresent(flags, ARG_CREATE_IF_MISSING);
disable_wal_ = IsFlagPresent(flags, ARG_DISABLE_WAL);
}
void DBLoaderCommand::Help(string& ret) {
ret.append(" ");
ret.append(DBLoaderCommand::Name());
ret.append(" [--" + ARG_CREATE_IF_MISSING + "]");
ret.append(" [--" + ARG_DISABLE_WAL + "]");
ret.append("\n");
}
leveldb::Options DBLoaderCommand::PrepareOptionsForOpenDB() {
leveldb::Options opt = LDBCommand::PrepareOptionsForOpenDB();
opt.create_if_missing = create_if_missing_;
return opt;
}
void DBLoaderCommand::DoCommand() {
if (!db_) {
return;
}
WriteOptions write_options;
if (disable_wal_) {
write_options.disableWAL = true;
}
int bad_lines = 0;
string line;
while (std::getline(std::cin, line, '\n')) {
string key;
string value;
if (ParseKeyValue(line, &key, &value, is_key_hex_, is_value_hex_)) {
db_->Put(write_options, Slice(key), Slice(value));
} else if (0 == line.find("Keys in range:")) {
// ignore this line
} else if (0 == line.find("Created bg thread 0x")) {
// ignore this line
} else {
bad_lines ++;
}
}
if (bad_lines > 0) {
std::cout << "Warning: " << bad_lines << " bad lines ignored." << std::endl;
}
}
const string DBDumperCommand::ARG_COUNT_ONLY = "count_only";
const string DBDumperCommand::ARG_STATS = "stats";
DBDumperCommand::DBDumperCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, true,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX,
ARG_FROM, ARG_TO, ARG_MAX_KEYS,
ARG_COUNT_ONLY, ARG_STATS})),
null_from_(true),
null_to_(true),
max_keys_(-1),
count_only_(false),
print_stats_(false) {
map<string, string>::const_iterator itr = options.find(ARG_FROM);
if (itr != options.end()) {
null_from_ = false;
from_ = itr->second;
}
itr = options.find(ARG_TO);
if (itr != options.end()) {
null_to_ = false;
to_ = itr->second;
}
itr = options.find(ARG_MAX_KEYS);
if (itr != options.end()) {
try {
max_keys_ = boost::lexical_cast<int>(itr->second);
} catch( const boost::bad_lexical_cast & ) {
exec_state_ = LDBCommandExecuteResult::FAILED(ARG_MAX_KEYS +
" has an invalid value");
}
}
print_stats_ = IsFlagPresent(flags, ARG_STATS);
count_only_ = IsFlagPresent(flags, ARG_COUNT_ONLY);
if (is_key_hex_) {
if (!null_from_) {
from_ = HexToString(from_);
}
if (!null_to_) {
to_ = HexToString(to_);
}
}
}
void DBDumperCommand::Help(string& ret) {
ret.append(" ");
ret.append(DBDumperCommand::Name());
ret.append(HelpRangeCmdArgs());
ret.append(" [--" + ARG_MAX_KEYS + "=<N>]");
ret.append(" [--" + ARG_COUNT_ONLY + "]");
ret.append(" [--" + ARG_STATS + "]");
ret.append("\n");
}
void DBDumperCommand::DoCommand() {
if (!db_) {
return;
}
// Parse command line args
uint64_t count = 0;
if (print_stats_) {
string stats;
if (db_->GetProperty("leveldb.stats", &stats)) {
fprintf(stdout, "%s\n", stats.c_str());
}
}
// Setup key iterator
leveldb::Iterator* iter = db_->NewIterator(leveldb::ReadOptions());
leveldb::Status st = iter->status();
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED("Iterator error."
+ st.ToString());
}
if (!null_from_) {
iter->Seek(from_);
} else {
iter->SeekToFirst();
}
int max_keys = max_keys_;
for (; iter->Valid(); iter->Next()) {
// If end marker was specified, we stop before it
if (!null_to_ && (iter->key().ToString() >= to_))
break;
// Terminate if maximum number of keys have been dumped
if (max_keys == 0)
break;
if (max_keys > 0) {
--max_keys;
}
++count;
if (!count_only_) {
string str = PrintKeyValue(iter->key().ToString(),
iter->value().ToString(),
is_key_hex_, is_value_hex_);
fprintf(stdout, "%s\n", str.c_str());
}
}
fprintf(stdout, "Keys in range: %lld\n", (long long) count);
// Clean up
delete iter;
}
const string ReduceDBLevelsCommand::ARG_NEW_LEVELS = "new_levels";
const string ReduceDBLevelsCommand::ARG_PRINT_OLD_LEVELS = "print_old_levels";
ReduceDBLevelsCommand::ReduceDBLevelsCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, false,
BuildCmdLineOptions({ARG_NEW_LEVELS, ARG_PRINT_OLD_LEVELS})),
old_levels_(1 << 16),
new_levels_(-1),
print_old_levels_(false) {
ParseIntOption(options_, ARG_NEW_LEVELS, new_levels_, exec_state_);
print_old_levels_ = IsFlagPresent(flags, ARG_PRINT_OLD_LEVELS);
if(new_levels_ <= 0) {
exec_state_ = LDBCommandExecuteResult::FAILED(
" Use --" + ARG_NEW_LEVELS + " to specify a new level number\n");
}
}
vector<string> ReduceDBLevelsCommand::PrepareArgs(const string& db_path,
int new_levels, bool print_old_level) {
vector<string> ret;
ret.push_back("reduce_levels");
ret.push_back("--" + ARG_DB + "=" + db_path);
ret.push_back("--" + ARG_NEW_LEVELS + "=" + std::to_string(new_levels));
if(print_old_level) {
ret.push_back("--" + ARG_PRINT_OLD_LEVELS);
}
return ret;
}
void ReduceDBLevelsCommand::Help(string& ret) {
ret.append(" ");
ret.append(ReduceDBLevelsCommand::Name());
ret.append(" --" + ARG_NEW_LEVELS + "=<New number of levels>");
ret.append(" [--" + ARG_PRINT_OLD_LEVELS + "]");
ret.append("\n");
}
leveldb::Options ReduceDBLevelsCommand::PrepareOptionsForOpenDB() {
leveldb::Options opt = LDBCommand::PrepareOptionsForOpenDB();
opt.num_levels = old_levels_;
// Disable size compaction
opt.max_bytes_for_level_base = 1UL << 50;
opt.max_bytes_for_level_multiplier = 1;
opt.max_mem_compaction_level = 0;
return opt;
}
Status ReduceDBLevelsCommand::GetOldNumOfLevels(leveldb::Options& opt,
int* levels) {
TableCache* tc = new TableCache(db_path_, &opt, 10);
const InternalKeyComparator* cmp = new InternalKeyComparator(
opt.comparator);
VersionSet* versions = new VersionSet(db_path_, &opt,
tc, cmp);
// We rely the VersionSet::Recover to tell us the internal data structures
// in the db. And the Recover() should never do any change
// (like LogAndApply) to the manifest file.
Status st = versions->Recover();
if (!st.ok()) {
return st;
}
int max = -1;
for (int i = 0; i < versions->NumberLevels(); i++) {
if (versions->NumLevelFiles(i)) {
max = i;
}
}
*levels = max + 1;
delete versions;
return st;
}
void ReduceDBLevelsCommand::DoCommand() {
if (new_levels_ <= 1) {
exec_state_ = LDBCommandExecuteResult::FAILED(
"Invalid number of levels.\n");
return;
}
leveldb::Status st;
leveldb::Options opt = PrepareOptionsForOpenDB();
int old_level_num = -1;
st = GetOldNumOfLevels(opt, &old_level_num);
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
return;
}
if (print_old_levels_) {
fprintf(stdout, "The old number of levels in use is %d\n", old_level_num);
}
if (old_level_num <= new_levels_) {
return;
}
old_levels_ = old_level_num;
OpenDB();
if (!db_) {
return;
}
// Compact the whole DB to put all files to the highest level.
fprintf(stdout, "Compacting the db...\n");
db_->CompactRange(NULL, NULL);
CloseDB();
TableCache* tc = new TableCache(db_path_, &opt, 10);
const InternalKeyComparator* cmp = new InternalKeyComparator(
opt.comparator);
VersionSet* versions = new VersionSet(db_path_, &opt,
tc, cmp);
// We rely the VersionSet::Recover to tell us the internal data structures
// in the db. And the Recover() should never do any change (like LogAndApply)
// to the manifest file.
st = versions->Recover();
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
return;
}
port::Mutex mu;
mu.Lock();
st = versions->ReduceNumberOfLevels(new_levels_, &mu);
mu.Unlock();
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
return;
}
}
const string WALDumperCommand::ARG_WAL_FILE = "walfile";
const string WALDumperCommand::ARG_PRINT_HEADER = "header";
WALDumperCommand::WALDumperCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, true,
BuildCmdLineOptions({ARG_WAL_FILE, ARG_PRINT_HEADER})),
print_header_(false) {
wal_file_.clear();
map<string, string>::const_iterator itr = options.find(ARG_WAL_FILE);
if (itr != options.end()) {
wal_file_ = itr->second;
}
print_header_ = IsFlagPresent(flags, ARG_PRINT_HEADER);
if (wal_file_.empty()) {
exec_state_ = LDBCommandExecuteResult::FAILED(
"Argument " + ARG_WAL_FILE + " must be specified.");
}
}
void WALDumperCommand::Help(string& ret) {
ret.append(" ");
ret.append(WALDumperCommand::Name());
ret.append(" --" + ARG_WAL_FILE + "=<write_ahead_log_file_path>");
ret.append(" --[" + ARG_PRINT_HEADER + "] ");
ret.append("\n");
}
void WALDumperCommand::DoCommand() {
struct StdErrReporter : public log::Reader::Reporter {
virtual void Corruption(size_t bytes, const Status& s) {
std::cerr<<"Corruption detected in log file "<<s.ToString()<<"\n";
}
};
unique_ptr<SequentialFile> file;
Env* env_ = Env::Default();
Status status = env_->NewSequentialFile(wal_file_, &file);
if (!status.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED("Failed to open WAL file " +
status.ToString());
} else {
StdErrReporter reporter;
log::Reader reader(std::move(file), &reporter, true, 0);
string scratch;
WriteBatch batch;
Slice record;
std::stringstream row;
if (print_header_) {
std::cout<<"Sequence,Count,ByteSize,Physical Offset\n";
}
while(reader.ReadRecord(&record, &scratch)) {
row.str("");
if (record.size() < 12) {
reporter.Corruption(
record.size(), Status::Corruption("log record too small"));
} else {
WriteBatchInternal::SetContents(&batch, record);
row<<WriteBatchInternal::Sequence(&batch)<<",";
row<<WriteBatchInternal::Count(&batch)<<",";
row<<WriteBatchInternal::ByteSize(&batch)<<",";
row<<reader.LastRecordOffset()<<"\n";
}
std::cout<<row.str();
}
}
}
GetCommand::GetCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, true,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX})) {
if (params.size() != 1) {
exec_state_ = LDBCommandExecuteResult::FAILED(
"<key> must be specified for the get command");
} else {
key_ = params.at(0);
}
if (is_key_hex_) {
key_ = HexToString(key_);
}
}
void GetCommand::Help(string& ret) {
ret.append(" ");
ret.append(GetCommand::Name());
ret.append(" <key>");
ret.append("\n");
}
void GetCommand::DoCommand() {
string value;
leveldb::Status st = db_->Get(leveldb::ReadOptions(), key_, &value);
if (st.ok()) {
fprintf(stdout, "%s\n",
(is_value_hex_ ? StringToHex(value) : value).c_str());
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
}
}
ApproxSizeCommand::ApproxSizeCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, true,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX,
ARG_FROM, ARG_TO})) {
if (options.find(ARG_FROM) != options.end()) {
start_key_ = options.find(ARG_FROM)->second;
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(ARG_FROM +
" must be specified for approxsize command");
return;
}
if (options.find(ARG_TO) != options.end()) {
end_key_ = options.find(ARG_TO)->second;
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(ARG_TO +
" must be specified for approxsize command");
return;
}
if (is_key_hex_) {
start_key_ = HexToString(start_key_);
end_key_ = HexToString(end_key_);
}
}
void ApproxSizeCommand::Help(string& ret) {
ret.append(" ");
ret.append(ApproxSizeCommand::Name());
ret.append(HelpRangeCmdArgs());
ret.append("\n");
}
void ApproxSizeCommand::DoCommand() {
leveldb::Range ranges[1];
ranges[0] = leveldb::Range(start_key_, end_key_);
uint64_t sizes[1];
db_->GetApproximateSizes(ranges, 1, sizes);
fprintf(stdout, "%ld\n", sizes[0]);
/* Wierd that GetApproximateSizes() returns void, although documentation
* says that it returns a Status object.
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
}
*/
}
BatchPutCommand::BatchPutCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, false,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX,
ARG_CREATE_IF_MISSING})) {
if (params.size() < 2) {
exec_state_ = LDBCommandExecuteResult::FAILED(
"At least one <key> <value> pair must be specified batchput.");
} else if (params.size() % 2 != 0) {
exec_state_ = LDBCommandExecuteResult::FAILED(
"Equal number of <key>s and <value>s must be specified for batchput.");
} else {
for (size_t i = 0; i < params.size(); i += 2) {
string key = params.at(i);
string value = params.at(i+1);
key_values_.push_back(std::pair<string, string>(
is_key_hex_ ? HexToString(key) : key,
is_value_hex_ ? HexToString(value) : value));
}
}
}
void BatchPutCommand::Help(string& ret) {
ret.append(" ");
ret.append(BatchPutCommand::Name());
ret.append(" <key> <value> [<key> <value>] [..]");
ret.append("\n");
}
void BatchPutCommand::DoCommand() {
leveldb::WriteBatch batch;
for (vector<std::pair<string, string>>::const_iterator itr
= key_values_.begin(); itr != key_values_.end(); itr++) {
batch.Put(itr->first, itr->second);
}
leveldb::Status st = db_->Write(leveldb::WriteOptions(), &batch);
if (st.ok()) {
fprintf(stdout, "OK\n");
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
}
}
leveldb::Options BatchPutCommand::PrepareOptionsForOpenDB() {
leveldb::Options opt = LDBCommand::PrepareOptionsForOpenDB();
opt.create_if_missing = IsFlagPresent(flags_, ARG_CREATE_IF_MISSING);
return opt;
}
ScanCommand::ScanCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, true,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX,
ARG_FROM, ARG_TO, ARG_MAX_KEYS})),
start_key_specified_(false),
end_key_specified_(false),
max_keys_scanned_(-1) {
map<string, string>::const_iterator itr = options.find(ARG_FROM);
if (itr != options.end()) {
start_key_ = itr->second;
if (is_key_hex_) {
start_key_ = HexToString(start_key_);
}
start_key_specified_ = true;
}
itr = options.find(ARG_TO);
if (itr != options.end()) {
end_key_ = itr->second;
if (is_key_hex_) {
end_key_ = HexToString(end_key_);
}
end_key_specified_ = true;
}
itr = options.find(ARG_MAX_KEYS);
if (itr != options.end()) {
try {
max_keys_scanned_ = boost::lexical_cast< int >(itr->second);
} catch( const boost::bad_lexical_cast & ) {
exec_state_ = LDBCommandExecuteResult::FAILED(ARG_MAX_KEYS +
" has an invalid value");
}
}
}
void ScanCommand::Help(string& ret) {
ret.append(" ");
ret.append(ScanCommand::Name());
ret.append(HelpRangeCmdArgs());
ret.append("--" + ARG_MAX_KEYS + "=N] ");
ret.append("\n");
}
void ScanCommand::DoCommand() {
int num_keys_scanned = 0;
Iterator* it = db_->NewIterator(leveldb::ReadOptions());
if (start_key_specified_) {
it->Seek(start_key_);
} else {
it->SeekToFirst();
}
for ( ;
it->Valid() && (!end_key_specified_ || it->key().ToString() < end_key_);
it->Next()) {
string key = it->key().ToString();
string value = it->value().ToString();
fprintf(stdout, "%s : %s\n",
(is_key_hex_ ? StringToHex(key) : key).c_str(),
(is_value_hex_ ? StringToHex(value) : value).c_str()
);
num_keys_scanned++;
if (max_keys_scanned_ >= 0 && num_keys_scanned >= max_keys_scanned_) {
break;
}
}
if (!it->status().ok()) { // Check for any errors found during the scan
exec_state_ = LDBCommandExecuteResult::FAILED(it->status().ToString());
}
delete it;
}
DeleteCommand::DeleteCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, false,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX})) {
if (params.size() != 1) {
exec_state_ = LDBCommandExecuteResult::FAILED(
"KEY must be specified for the delete command");
} else {
key_ = params.at(0);
if (is_key_hex_) {
key_ = HexToString(key_);
}
}
}
void DeleteCommand::Help(string& ret) {
ret.append(" ");
ret.append(DeleteCommand::Name() + " <key>");
ret.append("\n");
}
void DeleteCommand::DoCommand() {
leveldb::Status st = db_->Delete(leveldb::WriteOptions(), key_);
if (st.ok()) {
fprintf(stdout, "OK\n");
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
}
}
PutCommand::PutCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, false,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX,
ARG_CREATE_IF_MISSING})) {
if (params.size() != 2) {
exec_state_ = LDBCommandExecuteResult::FAILED(
"<key> and <value> must be specified for the put command");
} else {
key_ = params.at(0);
value_ = params.at(1);
}
if (is_key_hex_) {
key_ = HexToString(key_);
}
if (is_value_hex_) {
value_ = HexToString(value_);
}
}
void PutCommand::Help(string& ret) {
ret.append(" ");
ret.append(PutCommand::Name());
ret.append(" <key> <value> ");
ret.append("\n");
}
void PutCommand::DoCommand() {
leveldb::Status st = db_->Put(leveldb::WriteOptions(), key_, value_);
if (st.ok()) {
fprintf(stdout, "OK\n");
} else {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
}
}
leveldb::Options PutCommand::PrepareOptionsForOpenDB() {
leveldb::Options opt = LDBCommand::PrepareOptionsForOpenDB();
opt.create_if_missing = IsFlagPresent(flags_, ARG_CREATE_IF_MISSING);
return opt;
}
const char* DBQuerierCommand::HELP_CMD = "help";
const char* DBQuerierCommand::GET_CMD = "get";
const char* DBQuerierCommand::PUT_CMD = "put";
const char* DBQuerierCommand::DELETE_CMD = "delete";
DBQuerierCommand::DBQuerierCommand(const vector<string>& params,
const map<string, string>& options, const vector<string>& flags) :
LDBCommand(options, flags, false,
BuildCmdLineOptions({ARG_HEX, ARG_KEY_HEX, ARG_VALUE_HEX})) {
}
void DBQuerierCommand::Help(string& ret) {
ret.append(" ");
ret.append(DBQuerierCommand::Name());
ret.append("\n");
ret.append(" Starts a REPL shell. Type help for list of available "
"commands.");
ret.append("\n");
}
void DBQuerierCommand::DoCommand() {
if (!db_) {
return;
}
leveldb::ReadOptions read_options;
leveldb::WriteOptions write_options;
string line;
string key;
string value;
while (getline(std::cin, line, '\n')) {
// Parse line into vector<string>
vector<string> tokens;
size_t pos = 0;
while (true) {
size_t pos2 = line.find(' ', pos);
if (pos2 == string::npos) {
break;
}
tokens.push_back(line.substr(pos, pos2-pos));
pos = pos2 + 1;
}
tokens.push_back(line.substr(pos));
const string& cmd = tokens[0];
if (cmd == HELP_CMD) {
fprintf(stdout,
"get <key>\n"
"put <key> <value>\n"
"delete <key>\n");
} else if (cmd == DELETE_CMD && tokens.size() == 2) {
key = (is_key_hex_ ? HexToString(tokens[1]) : tokens[1]);
db_->Delete(write_options, Slice(key));
fprintf(stdout, "Successfully deleted %s\n", tokens[1].c_str());
} else if (cmd == PUT_CMD && tokens.size() == 3) {
key = (is_key_hex_ ? HexToString(tokens[1]) : tokens[1]);
value = (is_value_hex_ ? HexToString(tokens[2]) : tokens[2]);
db_->Put(write_options, Slice(key), Slice(value));
fprintf(stdout, "Successfully put %s %s\n",
tokens[1].c_str(), tokens[2].c_str());
} else if (cmd == GET_CMD && tokens.size() == 2) {
key = (is_key_hex_ ? HexToString(tokens[1]) : tokens[1]);
if (db_->Get(read_options, Slice(key), &value).ok()) {
fprintf(stdout, "%s\n", PrintKeyValue(key, value,
is_key_hex_, is_value_hex_).c_str());
} else {
fprintf(stdout, "Not found %s\n", tokens[1].c_str());
}
} else {
fprintf(stdout, "Unknown command %s\n", line.c_str());
}
}
}
}
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