Redis 4.x Cookbook

How to do it...

The steps for writing a Redis module are as follows:

1. Create a mymodule.c file and include the header file, redismodule.h:

#include "redismodule.h" 

2. Create a RedisModule_OnLoad() function:

int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { 
  if (RedisModule_Init(ctx, "mymodule", 1, REDISMODULE_APIVER_1) == REDISMODULE_ERR) { 
    return REDISMODULE_ERR; 
  } 
 
  if (RedisModule_CreateCommand(ctx, "mymodule.zip", MyModule_Zip, "write deny-oom no-cluster", 1, 1, 1) == REDISMODULE_ERR) { 
    return REDISMODULE_ERR; 
  } 
 
  return REDISMODULE_OK; 
}

3. Create a MyModule_Zip() function, which is the handler function of our new command:

int MyModule_Zip(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { // MYMODULE.ZIP ...