Function closeClientOnOutputBufferLimitReached

app/redis-6.2.6/src/networking.c:3267–3289

Asynchronously close a client if soft or hard limit is reached on the * output buffer size. The caller can check if the client will be closed * checking if the client CLIENT_CLOSE_ASAP flag is set. * * Note: we need to close the client asynchronously because this function is * called from contexts where the client can't be freed safely, i.e. from the * lower level functions pushing data insi

 *
 * Returns 1 if client was (flagged) closed. */
int closeClientOnOutputBufferLimitReached(client *c, int async) {
    if (!c->conn) return 0; /* It is unsafe to free fake clients. */
    serverAssert(c->reply_bytes < SIZE_MAX-(1024*64));
    if (c->reply_bytes == 0 || c->flags & CLIENT_CLOSE_ASAP) return 0;
    if (checkClientOutputBufferLimits(c)) {
        sds client = catClientInfoString(sdsempty(),c);

        if (async) {
            freeClientAsync(c);
            serverLog(LL_WARNING,
                      "Client %s scheduled to be closed ASAP for overcoming of output buffer limits.",
                      client);
        } else {
            freeClient(c);
            serverLog(LL_WARNING,
                      "Client %s closed for overcoming of output buffer limits.",
                      client);
        }
        sdsfree(client);
        return  1;
    }
    return 0;
}

/* Helper function used by performEvictions() in order to flush slaves
 * output buffers without returning control to the event loop.