Examples

Examples

Redis Client

#include <cpp_redis/cpp_redis>

#include <signal.h>
#include <iostream>

volatile std::atomic_bool should_exit(false);
cpp_redis::redis_client client;

void
sigint_handler(int) {
  std::cout << "disconnected (sigint handler)" << std::endl;
  client.disconnect();
  should_exit = true;
}

int
main(void) {
  client.connect("127.0.0.1", 6379, [] (cpp_redis::redis_client&) {
    std::cout << "client disconnected (disconnection handler)" << std::endl;
    should_exit = true;
  });

  // same as client.send({ "SET", "hello", "42" }, ...)
  client.set("hello", "42", [] (cpp_redis::reply& reply) {
    std::cout << reply.as_string() << std::endl;
  });
  // same as client.send({ "DECRBY", "hello", 12 }, ...)
  client.decrby("hello", 12, [] (cpp_redis::reply& reply) {
    std::cout << reply.as_integer() << std::endl;
  });
  // same as client.send({ "GET", "hello" }, ...)
  client.get("hello", [] (cpp_redis::reply& reply) {
    std::cout << reply.as_string() << std::endl;
  });
  // commands are pipelined and only sent when client.commit() is called
  client.commit();
  // synchronous commit, no timeout
  // client.sync_commit();
  // synchronous commit, timeout
  // client.sync_commit(std::chrono::milliseconds(100));

  signal(SIGINT, &sigint_handler);
  while (not should_exit);

  return 0;
}

Redis Subscriber

#include <cpp_redis/cpp_redis>

#include <signal.h>
#include <iostream>

volatile std::atomic_bool should_exit(false);
cpp_redis::redis_subscriber sub;

void
sigint_handler(int) {
  std::cout << "disconnected (sigint handler)" << std::endl;
  sub.disconnect();
  should_exit = true;
}

int
main(void) {
  sub.connect("127.0.0.1", 6379, [](cpp_redis::redis_subscriber&) {
    std::cout << "sub disconnected (disconnection handler)" << std::endl;
    should_exit = true;
  });

  sub.subscribe("some_chan", [] (const std::string& chan, const std::string& msg) {
    std::cout << "MESSAGE " << chan << ": " << msg << std::endl;
  });
  sub.psubscribe("*", [] (const std::string& chan, const std::string& msg) {
    std::cout << "PMESSAGE " << chan << ": " << msg << std::endl;
  });
  sub.commit();

  signal(SIGINT, &sigint_handler);
  while (not should_exit);

  return 0;
}

Logger

#include <cpp_redis/cpp_redis>

#include <iostream>

class my_logger : public cpp_redis::logger_iface {
public:
  //! ctor & dtor
  my_logger(void) = default;
  ~my_logger(void) = default;

  //! copy ctor & assignment operator
  my_logger(const my_logger&) = default;
  my_logger& operator=(const my_logger&) = default;

public:
  void debug(const std::string& msg, const std::string& file, unsigned int line) {
    std::cout << "debug: " << msg << " @ " << file << ":" << line << std::endl;
  }

  void info(const std::string& msg, const std::string& file, unsigned int line) {
    std::cout << "info: " << msg << " @ " << file << ":" << line << std::endl;
  }

  void warn(const std::string& msg, const std::string& file, unsigned int line) {
    std::cout << "warn: " << msg << " @ " << file << ":" << line << std::endl;
  }

  void error(const std::string& msg, const std::string& file, unsigned int line) {
    std::cerr << "error: " << msg << " @ " << file << ":" << line << std::endl;
  }
};


int
main(void) {
  //! By default, no logging
  //! Force logger call, just for the example (you will never have to do that by yourself)
  std::cout << "By default: no logging" << std::endl;
  _CPP_REDIS_LOG(debug, "This is a debug message");
  _CPP_REDIS_LOG(info, "This is an info message");
  _CPP_REDIS_LOG(warn, "This is a warn message");
  _CPP_REDIS_LOG(error, "This is an error message");
  std::cout << std::endl;

  //! Use the default logger, provided with the library
  cpp_redis::active_logger = std::unique_ptr<cpp_redis::logger>(new cpp_redis::logger);
  //! Force logger call, just for the example (you will never have to do that by yourself)
  std::cout << "With the library provided logger" << std::endl;
  _CPP_REDIS_LOG(debug, "This is a debug message");
  _CPP_REDIS_LOG(info, "This is an info message");
  _CPP_REDIS_LOG(warn, "This is a warn message");
  _CPP_REDIS_LOG(error, "This is an error message");
  std::cout << std::endl;

  //! Use your custom logger
  cpp_redis::active_logger = std::unique_ptr<my_logger>(new my_logger);
  //! Force logger call, just for the example (you will never have to do that by yourself)
  std::cout << "With an example of custom logger" << std::endl;
  _CPP_REDIS_LOG(debug, "This is a debug message");
  _CPP_REDIS_LOG(info, "This is an info message");
  _CPP_REDIS_LOG(warn, "This is a warn message");
  _CPP_REDIS_LOG(error, "This is an error message");
  std::cout << std::endl;

  return 0;
}