Function sendCommand

src/replication.cpp:3117–3145

Compose a multi-bulk command and send it to the connection. * Used to send AUTH and REPLCONF commands to the master before starting the * replication. * * Takes a list of char* arguments, terminated by a NULL argument. * * The command returns an sds string representing the result of the * operation. On error the first byte is a "-". */

 * operation. On error the first byte is a "-".
 */
char *sendCommand(connection *conn, ...) {
    va_list ap;
    sds cmd = sdsempty();
    sds cmdargs = sdsempty();
    size_t argslen = 0;
    char *arg;

    /* Create the command to send to the master, we use redis binary
     * protocol to make sure correct arguments are sent. This function
     * is not safe for all binary data. */
    va_start(ap,conn);
    while(1) {
        arg = va_arg(ap, char*);
        if (arg == NULL) break;
        cmdargs = sdscatprintf(cmdargs,"$%zu\r\n%s\r\n",strlen(arg),arg);
        argslen++;
    }

    cmd = sdscatprintf(cmd,"*%zu\r\n",argslen);
    cmd = sdscatsds(cmd,cmdargs);
    sdsfree(cmdargs);

    va_end(ap);
    char* err = sendCommandRaw(conn, cmd);
    sdsfree(cmd);
    if(err)
        return err;
    return NULL;
}

/* Compose a multi-bulk command and send it to the connection. 
 * Used to send AUTH and REPLCONF commands to the master before starting the