RedisBigNum

A simple Redis module for setting and incrementing big numbers. Native Redis INCRBY and HINCRBY commands are limited to signed 64-bit integers.

Usage

Loading the module

Load the module through redis either through:

redis-server --loadmodule /path/to/bignumber.so

or inside redis.conf loadmodule /path/to/bignumber.so

or at runtime MODULE LOAD /path/to/bignumber.so

Using the module

127.0.0.1:6379> BIGNUM someKey SET 1
OK
127.0.0.1:6379> BIGNUM someKey INCRBY 10000000000000000000000000000000000000000000000000
OK
127.0.0.1:6379> GET someKey
"10000000000000000000000000000000000000000000000001"
127.0.0.1:6379> BIGNUM someKey INCRBY -10000000000000000000000000000000000000000000000000
OK
127.0.0.1:6379> GET someKey
"1"
127.0.0.1:6379> BIGNUM someKey INCRBY -1
OK
127.0.0.1:6379> GET someKey
"0"

Note, this module only works on whole numbers. Decimals are not supported.

Building

RedisBigNum only requires one external dependency, libgmp.

On Mac: brew install gmp

On Debian Linux: sudo apt-get install libgmp3-dev

Then simply run: $ make

This will output bignumber.so which can then be loaded into redis.