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https://github.com/brianwatling/redispp

C++ client for Redis
https://github.com/brianwatling/redispp

Last synced: 3 months ago
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C++ client for Redis

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# Another C++ client for Redis [![Build Status](https://img.shields.io/travis/brianwatling/redispp/master.svg?style=flat-square&label=Travis)](https://travis-ci.org/brianwatling/redispp)



- Supports pipelining, using the same functions as synchronous requests

- The included performance test runs about 5 times faster with pipelining than with synchronous requests (single client/thread, on my laptop, to localhost)

- Depends on boost library

- Tested on Linux (clang-4.0 and g++-6), Windows (VC++ 2010), Mac (g++, OS X 10.6.5)

- Includes makefile, bjam jamfiles, and VC++ project

- Written against Redis 2.0.4 (and currently tested against docker redis 3.2.9)



## Performance



This client's pipelining allows it to really push the redis server, even with one client. I ran the included performance benchmark on my Ubuntu 9.10 64-bit virtual machine. The physical machine is quad-core @ 3Ghz with 8GB RAM @ 800Mhz. At 256 requests 'on-the-wire', I reached approximately 230k writes per second with one connection (a write is: conn.set("somemediumkey2", "somemediumvalue")). I was able to reach nearly 260k writes per second with 4096 requests 'on-the-wire'. Below is test/perf.cpp's output for various amounts of outstanding requests.



256 requests on the wire:



    bwatling@ubuntu:~/Desktop/redispp$ for cur in `seq 1 10`; do ./test/bin/perf.test/gcc-4.4.1/release/perf 6379 1000000; done

    1000000 writes in 4451367 usecs ~= 224650 requests per second

    1000000 writes in 4301082 usecs ~= 232500 requests per second

    1000000 writes in 4294144 usecs ~= 232875 requests per second

    1000000 writes in 4255403 usecs ~= 234995 requests per second

    1000000 writes in 4272437 usecs ~= 234058 requests per second

    1000000 writes in 4273374 usecs ~= 234007 requests per second

    1000000 writes in 4251377 usecs ~= 235218 requests per second

    1000000 writes in 4288723 usecs ~= 233170 requests per second

    1000000 writes in 4247717 usecs ~= 235421 requests per second

    1000000 writes in 4257261 usecs ~= 234893 requests per second



4096 requests on the wire:



    bwatling@ubuntu:~/Desktop/redispp$ for cur in `seq 1 10`; do ./test/bin/perf.test/gcc-4.4.1/release/perf 6379 1000000; done

    1000000 writes in 4035970 usecs ~= 247772 requests per second

    1000000 writes in 3855737 usecs ~= 259354 requests per second

    1000000 writes in 3876598 usecs ~= 257958 requests per second

    1000000 writes in 3867489 usecs ~= 258566 requests per second

    1000000 writes in 3887749 usecs ~= 257218 requests per second

    1000000 writes in 3826811 usecs ~= 261314 requests per second

    1000000 writes in 3864827 usecs ~= 258744 requests per second

    1000000 writes in 3893552 usecs ~= 256835 requests per second

    1000000 writes in 3881562 usecs ~= 257628 requests per second

    1000000 writes in 3869083 usecs ~= 258459 requests per second



In comparison, with a single client and no pipelining this machine could handle approximately 50k writes per second (using redispp and the same for credis).



## Simple example



```cpp

redispp::Connection conn("127.0.0.1", "6379", "password", false);

conn.set("hello", "world");

```



## Pipelining Example



- Reply objects take care of reading the response lazily, on demand

- The response is read in either the destructor or when the return value is used

- The objects can be nested/scoped in any order. All outstanding replies are read and cached for later when a newer request's response is used.

- See test/perf.cpp or test/test.cpp for more examples



Up to 64 requests 'on the wire':



```cpp

VoidReply replies[64];



for(size_t i = 0; i < count; ++i)

{

    replies[i & 63] = conn.set(keys[i], values[i]);

}

```



Save an object using pipelining. ~BoolReply takes care of reading the responses in order.



```cpp

{

    BoolReply a = conn.hset("computer", "os", "linux");

    BoolReply b = conn.hset("computer", "speed", "3Ghz");

    BoolReply c = conn.hset("computer", "RAM", "8GB");

    BoolReply d = conn.hset("computer", "cores", "4");

}

//here all the replies have been cleared off conn's socket

```



Start loading a value, then use it later:



```cpp

StringReply value = conn.get("world");

//do stuff

std::string theValue = value;

```



These are resolved immediately:



```cpp

int hlen = conn.hlen("computer");

std::string value = conn.get("world");

```



This demonstrates arbitrary nesting/scoping and works as expected (see test/test.cpp). There's no problems caused by a and readA outliving b and c:



```cpp

{

    VoidReply a = conn.set("one", "a");

    StringReply readA = conn.get("one");

    {

        BoolReply b = conn.hset("two", "two", "b");

        VoidReply c = conn.set("three", "c");

    }

    BOOST_CHECK(readA.result() == "a");

}

```



## Multi Bulk Replies



Request that have multi-bulk replies supply a MultiBulkEnumerator as the return type. The MultiBulkEnumerator will read the data lazily as requested.



Read out a list:



```cpp

conn.lpush("hello", "a")

conn.lpush("hello", "b")

conn.lpush("hello", "c")

MultiBulkEnumerator result = conn.lrange("hello", 1, 3);

std::string result;

while(result.next(&result))

    std::cout << result << std::endl;

```



## Transactions



The client has basic support for transactions. It currently can open a MULTI and close it with an EXEC. Closing with a DISCARD is not supported yet. WATCH and UNWATCH may also come soon. Here's an example of how to use transactions. Note: it's very important to use the defered reply objects with transactions, or else the connection will be corrupted. (see trans.cpp for more detail).



```cpp

Transaction trans(&conn);

VoidReply one = conn.set("x", "1");

VoidReply two = conn.set("y", "21");

StringReply three = conn.get("x");

trans.commit();

//access one, two, and three here

```



## Building



- You should be able to build libredispp.a and libredispp.so by typing 'make'

- Bjam users can type 'bjam'

- Windows can use the included VC++ 2010 project file. Be warned I've set it up to simply call bjam. It should be fairly simple to create a regular project or include the source in your own.

- **WARNING** The unit tests will not pass unless you change TEST_PORT in test/test.cpp. The *entire* redis database will be cleared

- You should run the unit and performance tests with a temporary database, with no production data

- The performance test will not run unless you start it with a port (ie ./perf 6379)



## TODO



- add a way to listen for messages after subscribing to a channel

- fill in the missing requests

- cleanup code, move stuff out of the header to the .cpp file

- implement a clean method for watch and related functions (using transaction objects)

- write a consistent hashing wrapper?



## License



See [LICENSE.md](LICENSE.md). Credit is appreciated (but not required), and I would like to hear about how you use it (but again, not required).



## Contributors



- Brian Watling

- Alex Ianus