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redisclient.cpp
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redisclient.cpp
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/* redisclient.cpp -- a C++ client library for redis.
*
* Copyright (c) 2009, Brian Hammond <brian at fictorial dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "redisclient.h"
#include "anet.h"
#include <sstream>
#ifndef NDEBUG
#include <algorithm>
#include <iostream>
#include <ctime>
#endif
#include <cstring>
#include <cassert>
#include <sys/errno.h>
#include <sys/socket.h>
using namespace std;
namespace
{
const string whitespace(" \f\n\r\t\v");
const string CRLF("\r\n");
// Modifies in-place.
inline string & rtrim(string & str, const string & ws = whitespace)
{
string::size_type pos = str.find_last_not_of(ws);
str.erase(pos + 1);
return str;
}
vector<string>::size_type split(const string & str, char delim, vector<string> & elems)
{
stringstream ss(str);
string item;
vector<string>::size_type n = 0;
while (getline(ss, item, delim))
{
elems.push_back(item);
++n;
}
return n;
}
inline void split_lines(const string & str, vector<string> & elems)
{
split(str, '\n', elems);
for (vector<string>::iterator it = elems.begin(); it != elems.end(); ++it)
rtrim(*it);
}
#ifndef NDEBUG
void output_proto_debug(const string & data, bool is_received = true)
{
string escaped_data(data);
size_t pos;
while ((pos = escaped_data.find("\n")) != string::npos)
escaped_data.replace(pos, 1, "\\n");
while ((pos = escaped_data.find("\r")) != string::npos)
escaped_data.replace(pos, 1, "\\r");
cerr
<< time(NULL) << ": "
<< (is_received ? "RECV '" : "SEND '")
<< escaped_data
<< "'"
<< endl;
}
#endif
class makecmd
{
public:
explicit makecmd(const string & initial, bool finalize = false)
{
buffer_ << initial;
if (!finalize)
buffer_ << " ";
}
template <typename T>
makecmd & operator<<(T const & datum)
{
buffer_ << datum;
return *this;
}
template <typename T>
makecmd & operator<<(const vector<T> & data)
{
size_t n = data.size();
for (size_t i = 0; i < n; ++i)
{
buffer_ << data[i];
if (i < n - 1)
buffer_ << " ";
}
return *this;
}
operator std::string ()
{
buffer_ << CRLF;
return buffer_.str();
}
private:
ostringstream buffer_;
};
// Reads N bytes from given blocking socket.
string read_n(int socket, ssize_t n)
{
char * buffer = new char[n + 1];
buffer[n] = '\0';
char * bp = buffer;
ssize_t bytes_read = 0;
while (bytes_read != n)
{
ssize_t bytes_received = 0;
do bytes_received = recv(socket, bp, n - (bp - buffer), 0);
while (bytes_received < 0 && errno == EINTR);
if (bytes_received == 0)
throw redis::connection_error("connection was closed");
bytes_read += bytes_received;
bp += bytes_received;
}
string str(buffer);
delete [] buffer;
return str;
}
// Reads a single line of character data from the given blocking socket.
// Returns the line that was read, not including EOL delimiter(s). Both LF
// ('\n') and CRLF ("\r\n") delimiters are supported. If there was an I/O
// error reading from the socket, connection_error is raised. If max_size
// bytes are read before finding an EOL delimiter, a blank string is
// returned.
string read_line(int socket, ssize_t max_size = 2048)
{
assert(socket > 0);
assert(max_size > 0);
ostringstream oss;
enum { buffer_size = 64 };
char buffer[buffer_size];
memset(buffer, 0, buffer_size);
ssize_t total_bytes_read = 0;
bool found_delimiter = false;
while (total_bytes_read < max_size && !found_delimiter)
{
// Peek at what's available.
ssize_t bytes_received = 0;
do bytes_received = recv(socket, buffer, buffer_size, MSG_PEEK);
while (bytes_received < 0 && errno == EINTR);
if (bytes_received == 0)
throw redis::connection_error("connection was closed");
// Some data is available; Length might be < buffer_size.
// Look for newline in whatever was read though.
char * eol = static_cast<char *>(memchr(buffer, '\n', bytes_received));
// If found, write data from the buffer to the output string.
// Else, write the entire buffer and continue reading more data.
ssize_t to_read = bytes_received;
if (eol)
{
to_read = eol - buffer + 1;
oss.write(buffer, to_read);
found_delimiter = true;
}
else
oss.write(buffer, bytes_received);
// Now read from the socket to remove the peeked data from the socket's
// read buffer. This will not block since we've peeked already and know
// there's data waiting. It might fail if we were interrupted however.
do bytes_received = recv(socket, buffer, to_read, 0);
while (bytes_received < 0 && errno == EINTR);
}
// Construct final line string. Remove trailing CRLF-based whitespace.
string line = oss.str();
return rtrim(line, CRLF);
}
template <typename T>
T value_from_string(const string & data)
{
T value;
istringstream iss(data);
iss >> value;
if (iss.fail())
throw redis::value_error("invalid number");
return value;
}
const string status_reply_ok("OK");
const string prefix_status_reply_error("-ERR ");
const char prefix_status_reply_value = '+';
const char prefix_single_bulk_reply = '$';
const char prefix_multi_bulk_reply = '*';
const char prefix_int_reply = ':';
const string server_info_key_version = "redis_version";
const string server_info_key_bgsave_in_progress = "bgsave_in_progress";
const string server_info_key_connected_clients = "connected_clients";
const string server_info_key_connected_slaves = "connected_slaves";
const string server_info_key_used_memory = "used_memory";
const string server_info_key_changes_since_last_save = "changes_since_last_save";
const string server_info_key_last_save_time = "last_save_time";
const string server_info_key_total_connections_received = "total_connections_received";
const string server_info_key_total_commands_processed = "total_commands_processed";
const string server_info_key_uptime_in_seconds = "uptime_in_seconds";
const string server_info_key_uptime_in_days = "uptime_in_days";
const string server_info_key_role = "role";
const string server_info_value_role_master = "master";
const string server_info_value_role_slave = "slave";
}
namespace redis
{
redis_error::redis_error(const string & err) : err_(err)
{
}
redis_error::operator std::string ()
{
return err_;
}
redis_error::operator const std::string () const
{
return err_;
}
connection_error::connection_error(const string & err) : redis_error(err)
{
}
protocol_error::protocol_error(const string & err) : redis_error(err)
{
}
key_error::key_error(const string & err) : redis_error(err)
{
}
value_error::value_error(const string & err) : redis_error(err)
{
}
client::string_type client::missing_value("**nonexistent-key**");
client::client(const string_type & host, unsigned int port)
{
char err[ANET_ERR_LEN];
socket_ = anetTcpConnect(err, const_cast<char*>(host.c_str()), port);
if (socket_ == ANET_ERR)
throw connection_error(err);
anetTcpNoDelay(NULL, socket_);
}
client::~client()
{
if (socket_ != ANET_ERR)
close(socket_);
}
void client::auth(const client::string_type & pass)
{
send_(makecmd("AUTH") << pass);
recv_ok_reply_();
}
void client::set(const client::string_type & key,
const client::string_type & value)
{
send_(makecmd("SET") << key << ' ' << value.size() << CRLF << value);
recv_ok_reply_();
}
client::string_type client::get(const client::string_type & key)
{
send_(makecmd("GET") << key);
return recv_bulk_reply_();
}
client::string_type client::getset(const client::string_type & key,
const client::string_type & value)
{
send_(makecmd("GETSET") << key << ' ' << value.size() << CRLF << value);
return recv_bulk_reply_();
}
void client::mget(const client::string_vector & keys, string_vector & out)
{
send_(makecmd("MGET") << keys);
recv_multi_bulk_reply_(out);
}
bool client::setnx(const client::string_type & key,
const client::string_type & value)
{
send_(makecmd("SETNX") << key << ' ' << value.size() << CRLF << value);
return recv_int_reply_() == 1;
}
client::int_type client::incr(const client::string_type & key)
{
send_(makecmd("INCR") << key);
return recv_int_reply_();
}
client::int_type client::incrby(const client::string_type & key,
client::int_type by)
{
send_(makecmd("INCRBY") << key << ' ' << by);
return recv_int_reply_();
}
client::int_type client::decr(const client::string_type & key)
{
send_(makecmd("DECR") << key);
return recv_int_reply_();
}
client::int_type client::decrby(const client::string_type & key,
client::int_type by)
{
send_(makecmd("DECRBY") << key << ' ' << by);
return recv_int_reply_();
}
bool client::exists(const client::string_type & key)
{
send_(makecmd("EXISTS") << key);
return recv_int_reply_() == 1;
}
void client::del(const client::string_type & key)
{
send_(makecmd("DEL") << key);
recv_int_ok_reply_();
}
client::datatype client::type(const client::string_type & key)
{
send_(makecmd("TYPE") << key);
string response = recv_single_line_reply_();
if (response == "none") return datatype_none;
if (response == "string") return datatype_string;
if (response == "list") return datatype_list;
if (response == "set") return datatype_set;
return datatype_none;
}
client::int_type client::keys(const client::string_type & pattern,
client::string_vector & out)
{
send_(makecmd("KEYS") << pattern);
string resp = recv_bulk_reply_();
return split(resp, ' ', out);
}
client::string_type client::randomkey()
{
send_(makecmd("RANDOMKEY", true));
return recv_single_line_reply_();
}
void client::rename(const client::string_type & old_name,
const client::string_type & new_name)
{
send_(makecmd("RENAME") << old_name << ' ' << new_name);
recv_ok_reply_();
}
bool client::renamenx(const client::string_type & old_name,
const client::string_type & new_name)
{
send_(makecmd("RENAMENX") << old_name << ' ' << new_name);
return recv_int_reply_() == 1;
}
client::int_type client::dbsize()
{
send_(makecmd("DBSIZE"));
return recv_int_reply_();
}
void client::expire(const string_type & key, unsigned int secs)
{
send_(makecmd("EXPIRE") << key << ' ' << secs);
recv_int_ok_reply_();
}
void client::rpush(const client::string_type & key,
const client::string_type & value)
{
send_(makecmd("RPUSH") << key << ' ' << value.length() << CRLF << value);
recv_ok_reply_();
}
void client::lpush(const client::string_type & key,
const client::string_type & value)
{
send_(makecmd("LPUSH") << key << ' ' << value.length() << CRLF << value);
recv_ok_reply_();
}
client::int_type client::llen(const client::string_type & key)
{
send_(makecmd("LLEN") << key);
return recv_int_reply_();
}
client::int_type client::lrange(const client::string_type & key,
client::int_type start,
client::int_type end,
client::string_vector & out)
{
send_(makecmd("LRANGE") << key << ' ' << start << ' ' << end);
return recv_multi_bulk_reply_(out);
}
void client::ltrim(const client::string_type & key,
client::int_type start,
client::int_type end)
{
send_(makecmd("LTRIM") << key << ' ' << start << ' ' << end);
recv_ok_reply_();
}
client::string_type client::lindex(const client::string_type & key,
client::int_type index)
{
send_(makecmd("LINDEX") << key << ' ' << index);
return recv_bulk_reply_();
}
void client::lset(const client::string_type & key,
client::int_type index,
const client::string_type & value)
{
send_(makecmd("LSET") << key << ' ' << index << ' ' << value.length() << CRLF << value);
recv_ok_reply_();
}
client::int_type client::lrem(const client::string_type & key,
client::int_type count,
const client::string_type & value)
{
send_(makecmd("LREM") << key << ' ' << count << ' ' << value.length() << CRLF << value);
return recv_int_reply_();
}
client::string_type client::lpop(const client::string_type & key)
{
send_(makecmd("LPOP") << key);
return recv_bulk_reply_();
}
client::string_type client::rpop(const client::string_type & key)
{
send_(makecmd("RPOP") << key);
return recv_bulk_reply_();
}
void client::sadd(const client::string_type & key,
const client::string_type & value)
{
send_(makecmd("SADD") << key << ' ' << value.length() << CRLF << value);
recv_int_ok_reply_();
}
void client::srem(const client::string_type & key,
const client::string_type & value)
{
send_(makecmd("SREM") << key << ' ' << value.length() << CRLF << value);
recv_int_ok_reply_();
}
void client::smove(const client::string_type & srckey,
const client::string_type & dstkey,
const client::string_type & value)
{
send_(makecmd("SMOVE") << srckey << ' ' << dstkey << ' ' << value.length() << CRLF << value);
recv_int_ok_reply_();
}
client::int_type client::scard(const client::string_type & key)
{
send_(makecmd("SCARD") << key);
return recv_int_reply_();
}
bool client::sismember(const client::string_type & key,
const client::string_type & value)
{
send_(makecmd("SISMEMBER") << key << ' ' << value.length() << CRLF << value);
return recv_int_reply_() == 1;
}
client::int_type client::sinter(const client::string_vector & keys, client::string_set & out)
{
send_(makecmd("SINTER") << keys);
return recv_multi_bulk_reply_(out);
}
client::int_type client::sinterstore(const client::string_type & dstkey,
const client::string_vector & keys)
{
send_(makecmd("SINTERSTORE") << dstkey << ' ' << keys);
return recv_int_reply_();
}
client::int_type client::sunion(const client::string_vector & keys,
client::string_set & out)
{
send_(makecmd("SUNION") << keys);
return recv_multi_bulk_reply_(out);
}
client::int_type client::sunionstore(const client::string_type & dstkey,
const client::string_vector & keys)
{
send_(makecmd("SUNIONSTORE") << dstkey << ' ' << keys);
return recv_int_reply_();
}
client::int_type client::smembers(const client::string_type & key,
client::string_set & out)
{
send_(makecmd("SMEMBERS") << key);
return recv_multi_bulk_reply_(out);
}
void client::select(client::int_type dbindex)
{
send_(makecmd("SELECT") << dbindex);
recv_ok_reply_();
}
void client::move(const client::string_type & key,
client::int_type dbindex)
{
send_(makecmd("MOVE") << key << ' ' << dbindex);
recv_int_ok_reply_();
}
void client::flushdb()
{
send_(makecmd("FLUSHDB", true));
recv_ok_reply_();
}
void client::flushall()
{
send_(makecmd("FLUSHALL", true));
recv_ok_reply_();
}
client::int_type client::sort(const client::string_type & key,
client::string_vector & out,
client::sort_order order,
bool lexicographically)
{
send_(makecmd("SORT") << key
<< (order == sort_order_ascending ? " ASC" : " DESC")
<< (lexicographically ? " ALPHA" : ""));
return recv_multi_bulk_reply_(out);
}
client::int_type client::sort(const client::string_type & key,
client::string_vector & out,
client::int_type limit_start,
client::int_type limit_end,
client::sort_order order,
bool lexicographically)
{
send_(makecmd("SORT") << key
<< " LIMIT " << limit_start << ' ' << limit_end
<< (order == sort_order_ascending ? " ASC" : " DESC")
<< (lexicographically ? " ALPHA" : ""));
return recv_multi_bulk_reply_(out);
}
client::int_type client::sort(const client::string_type & key,
client::string_vector & out,
const client::string_type & by_pattern,
client::int_type limit_start,
client::int_type limit_end,
const client::string_vector & get_patterns,
client::sort_order order,
bool lexicographically)
{
makecmd m("SORT");
m << key
<< " BY " << by_pattern
<< " LIMIT " << limit_start << ' ' << limit_end;
client::string_vector::const_iterator it = get_patterns.begin();
for ( ; it != get_patterns.end(); ++it)
m << " GET " << *it;
m << (order == sort_order_ascending ? " ASC" : " DESC")
<< (lexicographically ? " ALPHA" : "");
send_(m);
return recv_multi_bulk_reply_(out);
}
void client::save()
{
send_(makecmd("SAVE", true));
recv_ok_reply_();
}
void client::bgsave()
{
send_(makecmd("BGSAVE", true));
recv_ok_reply_();
}
time_t client::lastsave()
{
send_(makecmd("LASTSAVE", true));
return recv_int_reply_();
}
void client::shutdown()
{
send_(makecmd("SHUTDOWN", true));
// we expected to get a connection_error as redis closes the connection on shutdown command.
try
{
recv_ok_reply_();
}
catch (connection_error & e)
{
}
}
void client::info(server_info & out)
{
send_(makecmd("INFO", true));
string response = recv_bulk_reply_();
if (response.empty())
throw protocol_error("empty");
string_vector lines;
split_lines(response, lines);
if (lines.empty())
throw protocol_error("empty line for info");
for (string_vector::const_iterator it = lines.begin();
it != lines.end(); ++it)
{
const string & line = *it;
string_vector line_parts;
split(line, ':', line_parts);
if (line_parts.size() != 2)
throw protocol_error("unexpected line format for info");
const string & key = line_parts[0];
const string & val = line_parts[1];
if (key == server_info_key_version)
out.version = val;
else if (key == server_info_key_bgsave_in_progress)
out.bgsave_in_progress = value_from_string<unsigned long>(val) == 1;
else if (key == server_info_key_connected_clients)
out.connected_clients = value_from_string<unsigned long>(val);
else if (key == server_info_key_connected_slaves)
out.connected_slaves = value_from_string<unsigned long>(val);
else if (key == server_info_key_used_memory)
out.used_memory = value_from_string<unsigned long>(val);
else if (key == server_info_key_changes_since_last_save)
out.changes_since_last_save = value_from_string<unsigned long>(val);
else if (key == server_info_key_last_save_time)
out.last_save_time = value_from_string<unsigned long>(val);
else if (key == server_info_key_total_connections_received)
out.total_connections_received = value_from_string<unsigned long>(val);
else if (key == server_info_key_total_commands_processed)
out.total_commands_processed = value_from_string<unsigned long>(val);
else if (key == server_info_key_uptime_in_seconds)
out.uptime_in_seconds = value_from_string<unsigned long>(val);
else if (key == server_info_key_uptime_in_days)
out.uptime_in_days = value_from_string<unsigned long>(val);
else if (key == server_info_key_role)
out.role = val == server_info_value_role_master ? role_master : role_slave;
else
throw protocol_error(string("unexpected info key '") + key + "'");
}
}
//
// Private methods
//
void client::send_(const string & msg)
{
#ifndef NDEBUG
output_proto_debug(msg, false);
#endif
if (anetWrite(socket_, const_cast<char *>(msg.data()), msg.size()) == -1)
throw connection_error(strerror(errno));
}
string client::recv_single_line_reply_()
{
string line = read_line(socket_);
#ifndef NDEBUG
output_proto_debug(line);
#endif
if (line.empty())
throw protocol_error("empty single line reply");
if (line.find(prefix_status_reply_error) == 0)
{
string error_msg = line.substr(prefix_status_reply_error.length());
if (error_msg.empty())
error_msg = "unknown error";
throw protocol_error(error_msg);
}
if (line[0] != prefix_status_reply_value)
throw protocol_error("unexpected prefix for status reply");
return line.substr(1);
}
void client::recv_ok_reply_()
{
if (recv_single_line_reply_() != status_reply_ok)
throw protocol_error("expected OK response");
}
client::int_type client::recv_bulk_reply_(char prefix)
{
string line = read_line(socket_);
#ifndef NDEBUG
output_proto_debug(line);
#endif
if (line[0] != prefix)
throw protocol_error("unexpected prefix for bulk reply");
return value_from_string<client::int_type>(line.substr(1));
}
string client::recv_bulk_reply_()
{
int_type length = recv_bulk_reply_(prefix_single_bulk_reply);
if (length == -1)
return client::missing_value;
int_type real_length = length + 2; // CRLF
string data = read_n(socket_, real_length);
#ifndef NDEBUG
output_proto_debug(data.substr(0, data.length()-2));
#endif
if (data.empty())
throw protocol_error("invalid bulk reply data; empty");
if (data.length() != static_cast<string::size_type>(real_length))
throw protocol_error("invalid bulk reply data; data of unexpected length");
data.erase(data.size() - 2);
return data;
}
client::int_type client::recv_multi_bulk_reply_(string_vector & out)
{
int_type length = recv_bulk_reply_(prefix_multi_bulk_reply);
if (length == -1)
throw key_error("no such key");
for (int_type i = 0; i < length; ++i)
out.push_back(recv_bulk_reply_());
return length;
}
client::int_type client::recv_multi_bulk_reply_(string_set & out)
{
int_type length = recv_bulk_reply_(prefix_multi_bulk_reply);
if (length == -1)
throw key_error("no such key");
for (int_type i = 0; i < length; ++i)
out.insert(recv_bulk_reply_());
return length;
}
client::int_type client::recv_int_reply_()
{
string line = read_line(socket_);
#ifndef NDEBUG
output_proto_debug(line);
#endif
if (line.empty())
throw protocol_error("invalid integer reply; empty");
if (line[0] != prefix_int_reply)
throw protocol_error("unexpected prefix for integer reply");
return value_from_string<client::int_type>(line.substr(1));
}
void client::recv_int_ok_reply_()
{
if (recv_int_reply_() != 1)
throw protocol_error("expecting int reply of 1");
}
}