Function RM_EmitAOF

app/redis-6.2.6/src/module.c:5038–5082

Emits a command into the AOF during the AOF rewriting process. This function * is only called in the context of the aof_rewrite method of data types exported * by a module. The command works exactly like RedisModule_Call() in the way * the parameters are passed, but it does not return anything as the error * handling is performed by Redis itself. */

 * the parameters are passed, but it does not return anything as the error
 * handling is performed by Redis itself. */
void RM_EmitAOF(RedisModuleIO *io, const char *cmdname, const char *fmt, ...) {
    if (io->error) return;
    struct redisCommand *cmd;
    robj **argv = NULL;
    int argc = 0, flags = 0, j;
    va_list ap;

    cmd = lookupCommandByCString((char*)cmdname);
    if (!cmd) {
        serverLog(LL_WARNING,
            "Fatal: AOF method for module data type '%s' tried to "
            "emit unknown command '%s'",
            io->type->name, cmdname);
        io->error = 1;
        errno = EINVAL;
        return;
    }

    /* Emit the arguments into the AOF in Redis protocol format. */
    va_start(ap, fmt);
    argv = moduleCreateArgvFromUserFormat(cmdname,fmt,&argc,&flags,ap);
    va_end(ap);
    if (argv == NULL) {
        serverLog(LL_WARNING,
            "Fatal: AOF method for module data type '%s' tried to "
            "call RedisModule_EmitAOF() with wrong format specifiers '%s'",
            io->type->name, fmt);
        io->error = 1;
        errno = EINVAL;
        return;
    }

    /* Bulk count. */
    if (!io->error && rioWriteBulkCount(io->rio,'*',argc) == 0)
        io->error = 1;

    /* Arguments. */
    for (j = 0; j < argc; j++) {
        if (!io->error && rioWriteBulkObject(io->rio,argv[j]) == 0)
            io->error = 1;
        decrRefCount(argv[j]);
    }
    zfree(argv);
    return;
}

/* --------------------------------------------------------------------------
 * ## IO context handling