Example #1
0
bool b2b_forward_item(conn *uc, downstream *d, item *it) {
    int  vbucket = -1;
    bool local;
    conn *c;
    protocol_binary_request_header *req;
    char *key;
    int keylen;

    cb_assert(uc != NULL);
    cb_assert(uc->next == NULL);
    cb_assert(uc->noreply == false);
    cb_assert(it != NULL);

    req = (protocol_binary_request_header *) ITEM_data(it);
    key = ((char *) req) + sizeof(*req) + req->request.extlen;
    keylen = ntohs(req->request.keylen);

    if (settings.verbose > 2) {
        char buf[300];
        memcpy(buf, key, keylen);
        buf[keylen] = '\0';

        moxi_log_write("%d: b2b_forward_item nbytes %u, extlen %d, keylen %d opcode %x key (%s)\n",
                       uc->sfd, it->nbytes, req->request.extlen, keylen, req->request.opcode, buf);

        cproxy_dump_header(uc->sfd, (char *) req);
    }

    if (key == NULL ||
        keylen <= 0) {
        return false; /* We don't know how to hash an empty key. */
    }


    c = cproxy_find_downstream_conn_ex(d, key, keylen, &local, &vbucket);
    if (c != NULL) {
        if (local) {
            uc->hit_local = true;
        }
        if (b2b_forward_item_vbucket(uc, d, it, c, vbucket) == true) {
            d->downstream_used_start = 1;
            d->downstream_used = 1;

            cproxy_start_downstream_timeout(d, c);

            return true;
        }
    }

    if (settings.verbose > 2) {
        moxi_log_write("%d: b2b_forward_item failed (%d)\n",
                uc->sfd, (c != NULL));
    }

    return false;
}
Example #2
0
/* We reach here after nread'ing a header+body into an item.
 */
void cproxy_process_b2b_downstream_nread(conn *c) {
    conn *uc;
    item *it;
    downstream *d;
    protocol_binary_response_header *header;
    int extlen;
    int keylen;
    uint32_t bodylen;
    int status;
    int opcode;

    cb_assert(c != NULL);
    cb_assert(c->cmd >= 0);
    cb_assert(c->next == NULL);
    cb_assert(c->cmd_start == NULL);
    cb_assert(IS_BINARY(c->protocol));
    cb_assert(IS_PROXY(c->protocol));

    header = (protocol_binary_response_header *) &c->binary_header;
    extlen = header->response.extlen;
    keylen = header->response.keylen;
    bodylen = header->response.bodylen;
    status = ntohs(header->response.status);
    opcode = header->response.opcode;

    if (settings.verbose > 2) {
        moxi_log_write("<%d cproxy_process_b2b_downstream_nread %x %x %d %d %u %d %x\n",
                c->sfd, c->cmd, opcode, extlen, keylen, bodylen, c->noreply, status);
    }

    d = c->extra;
    cb_assert(d != NULL);
    cb_assert(d->ptd != NULL);
    cb_assert(d->ptd->proxy != NULL);

    /* TODO: Need to handle quiet binary command error response, */
    /*       in the right order. */
    /* TODO: Need to handle not-my-vbucket error during a quiet cmd. */

    uc = d->upstream_conn;
    it = c->item;

    /* Clear c->item because we either move it to the upstream or */
    /* item_remove() it on error. */

    c->item = NULL;

    cb_assert(it != NULL);
    cb_assert(it->refcount == 1);

    if (cproxy_binary_ignore_reply(c, header, it)) {
        return;
    }

    if (c->noreply) {
        conn_set_state(c, conn_new_cmd);
    } else {
        conn_set_state(c, conn_pause);

        if (opcode == PROTOCOL_BINARY_CMD_NOOP ||
            opcode == PROTOCOL_BINARY_CMD_FLUSH) {
            goto done;
        }

        if (opcode == PROTOCOL_BINARY_CMD_STAT) {
            if (status == PROTOCOL_BINARY_RESPONSE_SUCCESS) {
                if (keylen > 0) {
                    if (d->merger != NULL) {
                        char *key = (ITEM_data(it)) + sizeof(*header) + extlen;
                        char *val = key + keylen;

                        protocol_stats_merge_name_val(d->merger, "STAT", 4,
                                                      key, keylen,
                                                      val, bodylen - keylen - extlen);
                    }

                    conn_set_state(c, conn_new_cmd); /* Get next STATS response. */
                }
            }

            goto done;
        }

        /* If the client is still there, we should handle */
        /* a not-my-vbucket error with a possible retry. */

        if (uc != NULL &&
            status == PROTOCOL_BINARY_RESPONSE_NOT_MY_VBUCKET) {

            int max_retries;
            protocol_binary_request_header *req;
            int vbucket;
            int sindex;

            if (settings.verbose > 2) {
                moxi_log_write("<%d cproxy_process_b2b_downstream_nread not-my-vbucket, "
                        "cmd: %x %d\n",
                        c->sfd, header->response.opcode, uc->item != NULL);
            }

            cb_assert(uc->item != NULL);

            req = (protocol_binary_request_header *)ITEM_data((item*)uc->item);

            vbucket = ntohs(req->request.reserved);
            sindex = downstream_conn_index(d, c);

            if (settings.verbose > 2) {
                moxi_log_write("<%d cproxy_process_b2b_downstream_nread not-my-vbucket, "
                        "cmd: %x not multi-key get, sindex %d, vbucket %d, retries %d\n",
                        c->sfd, header->response.opcode,
                        sindex, vbucket, uc->cmd_retries);
            }

            mcs_server_invalid_vbucket(&d->mst, sindex, vbucket);

            /* As long as the upstream is still open and we haven't */
            /* retried too many times already. */

            max_retries = cproxy_max_retries(d);

            if (uc->cmd_retries < max_retries) {
                uc->cmd_retries++;

                d->upstream_retry++;
                d->ptd->stats.stats.tot_retry_vbucket++;

                goto done;
            }

            if (settings.verbose > 2) {
                moxi_log_write("%d: cproxy_process_b2b_downstream_nread not-my-vbucket, "
                        "cmd: %x skipping retry %d >= %d\n",
                        c->sfd, header->response.opcode, uc->cmd_retries,
                        max_retries);
            }
        }
    }

    /* Write the response to the upstream connection. */

    if (uc != NULL) {
        if (settings.verbose > 2) {
            moxi_log_write("<%d cproxy_process_b2b_downstream_nread got %u\n",
                           c->sfd, it->nbytes);

            cproxy_dump_header(c->sfd, ITEM_data(it));
        }

        if (add_conn_item(uc, it) == true) {
            it->refcount++;

            if (add_iov(uc, ITEM_data(it), it->nbytes) == 0) {
                /* If we got a quiet response, however, don't change the */
                /* upstream connection's state (should be in paused state), */
                /* as we expect the downstream server to provide a */
                /* verbal/non-quiet response that moves the downstream */
                /* conn through the conn_pause countdown codepath. */

                if (c->noreply == false) {
                    cproxy_update_event_write(d, uc);

                    conn_set_state(uc, conn_mwrite);
                }

                goto done;
            }
        }

        d->ptd->stats.stats.err_oom++;
        cproxy_close_conn(uc);
    }

 done:
    if (it != NULL) {
        item_remove(it);
    }
}
Example #3
0
/* Used for broadcast commands, like no-op, flush_all or stats.
 */
bool cproxy_broadcast_b2b_downstream(downstream *d, conn *uc) {
    int nwrite = 0;
    int nconns;
    int i;

    cb_assert(d != NULL);
    cb_assert(d->ptd != NULL);
    cb_assert(d->ptd->proxy != NULL);
    cb_assert(d->downstream_conns != NULL);
    cb_assert(uc != NULL);
    cb_assert(uc->next == NULL);
    cb_assert(uc->noreply == false);

    nconns = mcs_server_count(&d->mst);

    for (i = 0; i < nconns; i++) {
        conn *c = d->downstream_conns[i];
        if (c != NULL &&
            c != NULL_CONN &&
            b2b_forward_item_vbucket(uc, d, uc->item, c, -1) == true) {
            nwrite++;
        }
    }

    if (settings.verbose > 2) {
        moxi_log_write("%d: b2b broadcast nwrite %d out of %d\n",
                uc->sfd, nwrite, nconns);
    }

    if (nwrite > 0) {
        /* TODO: Handle binary 'stats reset' sub-command. */
        item *it;

        if (uc->cmd == PROTOCOL_BINARY_CMD_STAT &&
            d->merger == NULL) {
            d->merger = genhash_init(128, skeyhash_ops);
        }

        it = item_alloc("h", 1, 0, 0,
                              sizeof(protocol_binary_response_header));
        if (it != NULL) {
            protocol_binary_response_header *header =
                (protocol_binary_response_header *) ITEM_data(it);

            memset(ITEM_data(it), 0, it->nbytes);

            header->response.magic  = (uint8_t) PROTOCOL_BINARY_RES;
            header->response.opcode = uc->binary_header.request.opcode;
            header->response.opaque = uc->opaque;

            if (add_conn_item(uc, it)) {
                d->upstream_suffix     = ITEM_data(it);
                d->upstream_suffix_len = it->nbytes;
                d->upstream_status = PROTOCOL_BINARY_RESPONSE_SUCCESS;
                d->target_host_ident = NULL;

                if (settings.verbose > 2) {
                    moxi_log_write("%d: b2b broadcast upstream_suffix", uc->sfd);
                    cproxy_dump_header(uc->sfd, ITEM_data(it));
                }

                /* TODO: Handle FLUSHQ (quiet binary flush_all). */

                d->downstream_used_start = nwrite;
                d->downstream_used       = nwrite;

                cproxy_start_downstream_timeout(d, NULL);

                return true;
            }

            item_remove(it);
        }
    }

    return false;
}
Example #4
0
void protocol_stats_foreach_write(const void *key,
                                  const void *value,
                                  void *user_data) {

    char *line = (char *) value;
    conn *uc = (conn *) user_data;
    int nline;
    cb_assert(line != NULL);
    cb_assert(uc != NULL);
    (void)key;

    nline = strlen(line);
    if (nline > 0) {
        item *it;
        if (settings.verbose > 2) {
            moxi_log_write("%d: cproxy_stats writing: %s\n", uc->sfd, line);
        }

        if (IS_BINARY(uc->protocol)) {
            token_t line_tokens[MAX_TOKENS];
            size_t  line_ntokens = scan_tokens(line, line_tokens, MAX_TOKENS, NULL);

            if (line_ntokens == 4) {
                uint16_t key_len  = line_tokens[NAME_TOKEN].length;
                uint32_t data_len = line_tokens[VALUE_TOKEN].length;

                it = item_alloc("s", 1, 0, 0,
                                sizeof(protocol_binary_response_stats) + key_len + data_len);
                if (it != NULL) {
                    protocol_binary_response_stats *header =
                        (protocol_binary_response_stats *) ITEM_data(it);

                    memset(ITEM_data(it), 0, it->nbytes);

                    header->message.header.response.magic = (uint8_t) PROTOCOL_BINARY_RES;
                    header->message.header.response.opcode = uc->binary_header.request.opcode;
                    header->message.header.response.keylen  = (uint16_t) htons(key_len);
                    header->message.header.response.bodylen = htonl(key_len + data_len);
                    header->message.header.response.opaque  = uc->opaque;

                    memcpy((ITEM_data(it)) + sizeof(protocol_binary_response_stats),
                           line_tokens[NAME_TOKEN].value, key_len);
                    memcpy((ITEM_data(it)) + sizeof(protocol_binary_response_stats) + key_len,
                           line_tokens[VALUE_TOKEN].value, data_len);

                    if (add_conn_item(uc, it)) {
                        add_iov(uc, ITEM_data(it), it->nbytes);

                        if (settings.verbose > 2) {
                            moxi_log_write("%d: cproxy_stats writing binary", uc->sfd);
                            cproxy_dump_header(uc->sfd, ITEM_data(it));
                        }

                        return;
                    }

                    item_remove(it);
                }
            }

            return;
        }

        it = item_alloc("s", 1, 0, 0, nline + 2);
        if (it != NULL) {
            strncpy(ITEM_data(it), line, nline);
            strncpy(ITEM_data(it) + nline, "\r\n", 2);

            if (add_conn_item(uc, it)) {
                add_iov(uc, ITEM_data(it), nline + 2);
                return;
            }

            item_remove(it);
        }
    }
}