196821c6fc
The backend DCBs didn't have a valid service pointer whereas the client DCBs had one. The necessity of the pointer can be questioned as a similar pointer is located in the session.
978 lines
28 KiB
C
978 lines
28 KiB
C
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file session.c - A representation of the session within the gateway.
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 17/06/13 Mark Riddoch Initial implementation
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* 02/09/13 Massimiliano Pinto Added session refcounter
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* 29/05/14 Mark Riddoch Addition of filter mechanism
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* 23/08/15 Martin Brampton Tidying; slight improvement in safety
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* 17/09/15 Martin Brampton Keep failed session in existence - leave DCBs to close
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* 27/06/16 Martin Brampton Amend to utilise list manager
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*
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* @endverbatim
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*/
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#include <maxscale/session.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <maxscale/alloc.h>
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#include <maxscale/atomic.h>
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#include <maxscale/dcb.h>
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#include <maxscale/housekeeper.h>
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#include <maxscale/log_manager.h>
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#include <maxscale/poll.h>
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#include <maxscale/router.h>
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#include <maxscale/service.h>
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#include <maxscale/spinlock.h>
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#include "maxscale/session.h"
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#include "maxscale/filter.h"
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/* A session with null values, used for initialization */
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static MXS_SESSION session_initialized = SESSION_INIT;
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/** Global session id; updated safely by use of atomic_add */
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static int session_id;
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static struct session session_dummy_struct;
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static void session_initialize(void *session);
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static int session_setup_filters(MXS_SESSION *session);
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static void session_simple_free(MXS_SESSION *session, DCB *dcb);
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static void session_add_to_all_list(MXS_SESSION *session);
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static MXS_SESSION *session_find_free();
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static void session_final_free(MXS_SESSION *session);
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/**
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* @brief Initialize a session
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*
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* This routine puts initial values into the fields of the session pointed to
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* by the parameter. The parameter has to be passed as void * because the
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* function can be called by the generic list manager, which does not know
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* the actual type of the list entries it handles.
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*
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* All fields can be initialized by the assignment of the static
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* initialized session.
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*
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* @param *session Pointer to the session to be initialized
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*/
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static void
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session_initialize(void *session)
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{
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*(MXS_SESSION *)session = session_initialized;
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}
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/**
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* Allocate a new session for a new client of the specified service.
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*
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* Create the link to the router session by calling the newSession
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* entry point of the router using the router instance of the
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* service this session is part of.
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*
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* @param service The service this connection was established by
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* @param client_dcb The client side DCB
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* @return The newly created session or NULL if an error occured
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*/
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MXS_SESSION *
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session_alloc(SERVICE *service, DCB *client_dcb)
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{
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MXS_SESSION *session = (MXS_SESSION *)(MXS_MALLOC(sizeof(*session)));
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if (NULL == session)
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{
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return NULL;
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}
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session_initialize(session);
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/** Assign a session id and increase */
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session->ses_id = (size_t)atomic_add(&session_id, 1) + 1;
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session->ses_is_child = (bool) DCB_IS_CLONE(client_dcb);
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session->service = service;
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session->client_dcb = client_dcb;
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session->stats.connect = time(0);
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session->stmt.buffer = NULL;
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session->stmt.target = NULL;
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session->qualifies_for_pooling = false;
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/*<
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* Associate the session to the client DCB and set the reference count on
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* the session to indicate that there is a single reference to the
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* session. There is no need to protect this or use atomic add as the
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* session has not been made available to the other threads at this
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* point.
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*/
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session->refcount = 1;
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/*<
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* This indicates that session is ready to be shared with backend
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* DCBs. Note that this doesn't mean that router is initialized yet!
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*/
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session->state = SESSION_STATE_READY;
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session->trx_state = SESSION_TRX_INACTIVE;
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session->autocommit = true;
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/*
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* Only create a router session if we are not the listening
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* DCB or an internal DCB. Creating a router session may create a connection to a
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* backend server, depending upon the router module implementation
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* and should be avoided for the listener session
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*
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* Router session creation may create other DCBs that link to the
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* session, therefore it is important that the session lock is
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* relinquished before the router call.
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*/
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if (client_dcb->state != DCB_STATE_LISTENING &&
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client_dcb->dcb_role != DCB_ROLE_INTERNAL)
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{
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session->router_session = service->router->newSession(service->router_instance, session);
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if (session->router_session == NULL)
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{
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session->state = SESSION_STATE_TO_BE_FREED;
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MXS_ERROR("Failed to create new router session for service '%s'. "
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"See previous errors for more details.", service->name);
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}
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/*
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* Pending filter chain being setup set the head of the chain to
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* be the router. As filters are inserted the current head will
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* be pushed to the filter and the head updated.
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*
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* NB This dictates that filters are created starting at the end
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* of the chain nearest the router working back to the client
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* protocol end of the chain.
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*/
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session->head.instance = service->router_instance;
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session->head.session = session->router_session;
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session->head.routeQuery = (void *)(service->router->routeQuery);
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session->tail.instance = session;
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session->tail.session = session;
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session->tail.clientReply = session_reply;
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if (SESSION_STATE_TO_BE_FREED != session->state
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&& service->n_filters > 0
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&& !session_setup_filters(session))
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{
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session->state = SESSION_STATE_TO_BE_FREED;
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MXS_ERROR("Setting up filters failed. "
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"Terminating session %s.",
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service->name);
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}
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}
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if (SESSION_STATE_TO_BE_FREED != session->state)
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{
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session->state = SESSION_STATE_ROUTER_READY;
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if (session->client_dcb->user == NULL)
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{
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MXS_INFO("Started session [%lu] for %s service ",
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session->ses_id,
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service->name);
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}
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else
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{
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MXS_INFO("Started %s client session [%lu] for '%s' from %s",
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service->name,
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session->ses_id,
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session->client_dcb->user,
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session->client_dcb->remote);
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}
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}
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else
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{
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MXS_INFO("Start %s client session [%lu] for '%s' from %s failed, will be "
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"closed as soon as all related DCBs have been closed.",
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service->name,
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session->ses_id,
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session->client_dcb->user,
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session->client_dcb->remote);
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}
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atomic_add(&service->stats.n_sessions, 1);
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atomic_add(&service->stats.n_current, 1);
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CHK_SESSION(session);
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client_dcb->session = session;
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return SESSION_STATE_TO_BE_FREED == session->state ? NULL : session;
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}
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/**
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* Allocate a dummy session so that DCBs can always have sessions.
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*
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* Only one dummy session exists, it is statically declared
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*
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* @param client_dcb The client side DCB
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* @return The dummy created session
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*/
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MXS_SESSION *
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session_set_dummy(DCB *client_dcb)
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{
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MXS_SESSION *session;
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session = &session_dummy_struct;
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session->ses_chk_top = CHK_NUM_SESSION;
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session->ses_chk_tail = CHK_NUM_SESSION;
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session->ses_is_child = false;
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session->service = NULL;
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session->client_dcb = NULL;
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session->n_filters = 0;
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memset(&session->stats, 0, sizeof(MXS_SESSION_STATS));
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session->stats.connect = 0;
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session->state = SESSION_STATE_DUMMY;
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session->refcount = 1;
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session->ses_id = 0;
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client_dcb->session = session;
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return session;
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}
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/**
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* Link a session to a DCB.
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*
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* @param session The session to link with the dcb
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* @param dcb The DCB to be linked
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* @return True if the session was sucessfully linked to the DCB
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*/
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bool
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session_link_dcb(MXS_SESSION *session, DCB *dcb)
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{
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ss_info_dassert(session->state != SESSION_STATE_FREE,
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"If session->state is SESSION_STATE_FREE then this attempt to "
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"access freed memory block.");
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if (session->state == SESSION_STATE_FREE)
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{
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return false;
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}
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atomic_add(&session->refcount, 1);
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dcb->session = session;
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dcb->service = session->service;
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/** Move this DCB under the same thread */
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dcb->thread.id = session->client_dcb->thread.id;
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return true;
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}
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/**
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* Deallocate the specified session, minimal actions during session_alloc
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* Since changes to keep new session in existence until all related DCBs
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* have been destroyed, this function is redundant. Just left until we are
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* sure of the direction taken.
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*
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* @param session The session to deallocate
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*/
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static void
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session_simple_free(MXS_SESSION *session, DCB *dcb)
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{
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/* Does this possibly need a lock? */
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if (dcb->data && !DCB_IS_CLONE(dcb))
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{
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void * clientdata = dcb->data;
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dcb->data = NULL;
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MXS_FREE(clientdata);
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}
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if (session)
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{
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if (SESSION_STATE_DUMMY == session->state)
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{
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return;
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}
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if (session && session->router_session)
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{
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session->service->router->freeSession(
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session->service->router_instance,
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session->router_session);
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}
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session->state = SESSION_STATE_STOPPING;
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}
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session_final_free(session);
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}
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/**
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* Deallocate the specified session
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*
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* @param session The session to deallocate
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*/
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static void session_free(MXS_SESSION *session)
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{
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CHK_SESSION(session);
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ss_dassert(session->refcount == 0);
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session->state = SESSION_STATE_TO_BE_FREED;
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atomic_add(&session->service->stats.n_current, -1);
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if (session->client_dcb)
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{
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dcb_free_all_memory(session->client_dcb);
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}
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/**
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* If session is not child of some other session, free router_session.
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* Otherwise let the parent free it.
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*/
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if (!session->ses_is_child && session->router_session)
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{
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session->service->router->freeSession(session->service->router_instance,
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session->router_session);
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}
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if (session->n_filters)
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{
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int i;
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for (i = 0; i < session->n_filters; i++)
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{
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if (session->filters[i].filter)
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{
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session->filters[i].filter->obj->closeSession(session->filters[i].instance,
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session->filters[i].session);
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}
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}
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for (i = 0; i < session->n_filters; i++)
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{
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if (session->filters[i].filter)
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{
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session->filters[i].filter->obj->freeSession(session->filters[i].instance,
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session->filters[i].session);
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}
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}
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MXS_FREE(session->filters);
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}
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MXS_INFO("Stopped %s client session [%lu]", session->service->name, session->ses_id);
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/** If session doesn't have parent referencing to it, it can be freed */
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if (!session->ses_is_child)
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{
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session->state = SESSION_STATE_FREE;
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session_final_free(session);
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}
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}
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static void
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session_final_free(MXS_SESSION *session)
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{
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gwbuf_free(session->stmt.buffer);
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MXS_FREE(session);
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}
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/**
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* Check to see if a session is valid, i.e. in the list of all sessions
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*
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* @param session Session to check
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* @return 1 if the session is valid otherwise 0
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*/
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int
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session_isvalid(MXS_SESSION *session)
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{
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return session != NULL;
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}
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/**
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* Print details of an individual session
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*
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* @param session Session to print
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*/
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void
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printSession(MXS_SESSION *session)
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{
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struct tm result;
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char timebuf[40];
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printf("Session %p\n", session);
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printf("\tState: %s\n", session_state(session->state));
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printf("\tService: %s (%p)\n", session->service->name, session->service);
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printf("\tClient DCB: %p\n", session->client_dcb);
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printf("\tConnected: %s\n",
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asctime_r(localtime_r(&session->stats.connect, &result), timebuf));
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printf("\tRouter Session: %p\n", session->router_session);
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}
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bool printAllSessions_cb(DCB *dcb, void *data)
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{
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if (dcb->dcb_role == DCB_ROLE_CLIENT_HANDLER)
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{
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printSession(dcb->session);
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}
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return true;
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}
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/**
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* Print all sessions
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*
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* Designed to be called within a debugger session in order
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* to display all active sessions within the gateway
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*/
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void
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printAllSessions()
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{
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dcb_foreach(printAllSessions_cb, NULL);
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}
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/** Callback for dprintAllSessions */
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bool dprintAllSessions_cb(DCB *dcb, void *data)
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{
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if (dcb->dcb_role == DCB_ROLE_CLIENT_HANDLER &&
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dcb->session->state != SESSION_STATE_DUMMY)
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{
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DCB *out_dcb = (DCB*)data;
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dprintSession(out_dcb, dcb->session);
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}
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return true;
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}
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/**
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* Print all sessions to a DCB
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*
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* Designed to be called within a debugger session in order
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* to display all active sessions within the gateway
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*
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* @param dcb The DCB to print to
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*/
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void
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dprintAllSessions(DCB *dcb)
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{
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dcb_foreach(dprintAllSessions_cb, dcb);
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}
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/**
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* Print a particular session to a DCB
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*
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* Designed to be called within a debugger session in order
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* to display all active sessions within the gateway
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*
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* @param dcb The DCB to print to
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* @param print_session The session to print
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*/
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void
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dprintSession(DCB *dcb, MXS_SESSION *print_session)
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{
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struct tm result;
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char buf[30];
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int i;
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dcb_printf(dcb, "Session %lu\n", print_session->ses_id);
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dcb_printf(dcb, "\tState: %s\n", session_state(print_session->state));
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dcb_printf(dcb, "\tService: %s\n", print_session->service->name);
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if (print_session->client_dcb && print_session->client_dcb->remote)
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{
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double idle = (hkheartbeat - print_session->client_dcb->last_read);
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idle = idle > 0 ? idle / 10.f : 0;
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dcb_printf(dcb, "\tClient Address: %s%s%s\n",
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print_session->client_dcb->user ? print_session->client_dcb->user : "",
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print_session->client_dcb->user ? "@" : "",
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print_session->client_dcb->remote);
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dcb_printf(dcb, "\tConnected: %s\n",
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asctime_r(localtime_r(&print_session->stats.connect, &result), buf));
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if (print_session->client_dcb->state == DCB_STATE_POLLING)
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{
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dcb_printf(dcb, "\tIdle: %.0f seconds\n", idle);
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}
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}
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if (print_session->n_filters)
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{
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for (i = 0; i < print_session->n_filters; i++)
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{
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dcb_printf(dcb, "\tFilter: %s\n",
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print_session->filters[i].filter->name);
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print_session->filters[i].filter->obj->diagnostics(print_session->filters[i].instance,
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print_session->filters[i].session,
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dcb);
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}
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}
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}
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bool dListSessions_cb(DCB *dcb, void *data)
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{
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if (dcb->dcb_role == DCB_ROLE_CLIENT_HANDLER)
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{
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DCB *out_dcb = (DCB*)data;
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MXS_SESSION *session = dcb->session;
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dcb_printf(out_dcb, "%-16lu | %-15s | %-14s | %s\n", session->ses_id,
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session->client_dcb && session->client_dcb->remote ?
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session->client_dcb->remote : "",
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session->service && session->service->name ?
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session->service->name : "",
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session_state(session->state));
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}
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return true;
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}
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/**
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* List all sessions in tabular form to a DCB
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*
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* Designed to be called within a debugger session in order
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* to display all active sessions within the gateway
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*
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* @param dcb The DCB to print to
|
|
*/
|
|
void
|
|
dListSessions(DCB *dcb)
|
|
{
|
|
dcb_printf(dcb, "-----------------+-----------------+----------------+--------------------------\n");
|
|
dcb_printf(dcb, "Session | Client | Service | State\n");
|
|
dcb_printf(dcb, "-----------------+-----------------+----------------+--------------------------\n");
|
|
|
|
dcb_foreach(dListSessions_cb, dcb);
|
|
|
|
dcb_printf(dcb, "-----------------+-----------------+----------------+--------------------------\n\n");
|
|
}
|
|
|
|
/**
|
|
* Convert a session state to a string representation
|
|
*
|
|
* @param state The session state
|
|
* @return A string representation of the session state
|
|
*/
|
|
char *
|
|
session_state(mxs_session_state_t state)
|
|
{
|
|
switch (state)
|
|
{
|
|
case SESSION_STATE_ALLOC:
|
|
return "Session Allocated";
|
|
case SESSION_STATE_DUMMY:
|
|
return "Dummy Session";
|
|
case SESSION_STATE_READY:
|
|
return "Session Ready";
|
|
case SESSION_STATE_ROUTER_READY:
|
|
return "Session ready for routing";
|
|
case SESSION_STATE_LISTENER:
|
|
return "Listener Session";
|
|
case SESSION_STATE_LISTENER_STOPPED:
|
|
return "Stopped Listener Session";
|
|
case SESSION_STATE_STOPPING:
|
|
return "Stopping session";
|
|
case SESSION_STATE_TO_BE_FREED:
|
|
return "Session to be freed";
|
|
case SESSION_STATE_FREE:
|
|
return "Freed session";
|
|
default:
|
|
return "Invalid State";
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create the filter chain for this session.
|
|
*
|
|
* Filters must be setup in reverse order, starting with the last
|
|
* filter in the chain and working back towards the client connection
|
|
* Each filter is passed the current session head of the filter chain
|
|
* this head becomes the destination for the filter. The newly created
|
|
* filter becomes the new head of the filter chain.
|
|
*
|
|
* @param session The session that requires the chain
|
|
* @return 0 if filter creation fails
|
|
*/
|
|
static int
|
|
session_setup_filters(MXS_SESSION *session)
|
|
{
|
|
SERVICE *service = session->service;
|
|
MXS_DOWNSTREAM *head;
|
|
MXS_UPSTREAM *tail;
|
|
int i;
|
|
|
|
if ((session->filters = MXS_CALLOC(service->n_filters,
|
|
sizeof(SESSION_FILTER))) == NULL)
|
|
{
|
|
return 0;
|
|
}
|
|
session->n_filters = service->n_filters;
|
|
for (i = service->n_filters - 1; i >= 0; i--)
|
|
{
|
|
if (service->filters[i] == NULL)
|
|
{
|
|
MXS_ERROR("Service '%s' contians an unresolved filter.", service->name);
|
|
return 0;
|
|
}
|
|
if ((head = filter_apply(service->filters[i], session,
|
|
&session->head)) == NULL)
|
|
{
|
|
MXS_ERROR("Failed to create filter '%s' for "
|
|
"service '%s'.\n",
|
|
service->filters[i]->name,
|
|
service->name);
|
|
return 0;
|
|
}
|
|
session->filters[i].filter = service->filters[i];
|
|
session->filters[i].session = head->session;
|
|
session->filters[i].instance = head->instance;
|
|
session->head = *head;
|
|
MXS_FREE(head);
|
|
}
|
|
|
|
for (i = 0; i < service->n_filters; i++)
|
|
{
|
|
if ((tail = filter_upstream(service->filters[i],
|
|
session->filters[i].session,
|
|
&session->tail)) == NULL)
|
|
{
|
|
MXS_ERROR("Failed to create filter '%s' for service '%s'.",
|
|
service->filters[i]->name,
|
|
service->name);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* filter_upstream may simply return the 3 parameter if
|
|
* the filter has no upstream entry point. So no need
|
|
* to copy the contents or free tail in this case.
|
|
*/
|
|
if (tail != &session->tail)
|
|
{
|
|
session->tail = *tail;
|
|
MXS_FREE(tail);
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* Entry point for the final element in the upstream filter, i.e. the writing
|
|
* of the data to the client.
|
|
*
|
|
* @param instance The "instance" data
|
|
* @param session The session
|
|
* @param data The buffer chain to write
|
|
*/
|
|
int
|
|
session_reply(void *instance, void *session, GWBUF *data)
|
|
{
|
|
MXS_SESSION *the_session = (MXS_SESSION *)session;
|
|
|
|
return the_session->client_dcb->func.write(the_session->client_dcb, data);
|
|
}
|
|
|
|
/**
|
|
* Return the client connection address or name
|
|
*
|
|
* @param session The session whose client address to return
|
|
*/
|
|
const char *
|
|
session_get_remote(const MXS_SESSION *session)
|
|
{
|
|
if (session && session->client_dcb)
|
|
{
|
|
return session->client_dcb->remote;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
bool session_route_query(MXS_SESSION* ses, GWBUF* buf)
|
|
{
|
|
bool succp;
|
|
|
|
if (ses->head.routeQuery == NULL ||
|
|
ses->head.instance == NULL ||
|
|
ses->head.session == NULL)
|
|
{
|
|
succp = false;
|
|
goto return_succp;
|
|
}
|
|
|
|
if (ses->head.routeQuery(ses->head.instance, ses->head.session, buf) == 1)
|
|
{
|
|
succp = true;
|
|
}
|
|
else
|
|
{
|
|
succp = false;
|
|
}
|
|
return_succp:
|
|
return succp;
|
|
}
|
|
|
|
|
|
/**
|
|
* Return the username of the user connected to the client side of the
|
|
* session.
|
|
*
|
|
* @param session The session pointer.
|
|
* @return The user name or NULL if it can not be determined.
|
|
*/
|
|
const char *
|
|
session_get_user(const MXS_SESSION *session)
|
|
{
|
|
return (session && session->client_dcb) ? session->client_dcb->user : NULL;
|
|
}
|
|
|
|
/**
|
|
* Callback structure for the session list extraction
|
|
*/
|
|
typedef struct
|
|
{
|
|
int index;
|
|
int current;
|
|
SESSIONLISTFILTER filter;
|
|
RESULT_ROW *row;
|
|
RESULTSET *set;
|
|
} SESSIONFILTER;
|
|
|
|
bool dcb_iter_cb(DCB *dcb, void *data)
|
|
{
|
|
SESSIONFILTER *cbdata = (SESSIONFILTER*)data;
|
|
|
|
if (cbdata->current < cbdata->index)
|
|
{
|
|
if (cbdata->filter == SESSION_LIST_ALL ||
|
|
(cbdata->filter == SESSION_LIST_CONNECTION &&
|
|
(dcb->session->state != SESSION_STATE_LISTENER)))
|
|
{
|
|
cbdata->current++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
char buf[20];
|
|
MXS_SESSION *list_session = dcb->session;
|
|
|
|
cbdata->index++;
|
|
cbdata->row = resultset_make_row(cbdata->set);
|
|
snprintf(buf, sizeof(buf), "%p", list_session);
|
|
resultset_row_set(cbdata->row, 0, buf);
|
|
resultset_row_set(cbdata->row, 1, ((list_session->client_dcb && list_session->client_dcb->remote)
|
|
? list_session->client_dcb->remote : ""));
|
|
resultset_row_set(cbdata->row, 2, (list_session->service && list_session->service->name
|
|
? list_session->service->name : ""));
|
|
resultset_row_set(cbdata->row, 3, session_state(list_session->state));
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Provide a row to the result set that defines the set of sessions
|
|
*
|
|
* @param set The result set
|
|
* @param data The index of the row to send
|
|
* @return The next row or NULL
|
|
*/
|
|
static RESULT_ROW *
|
|
sessionRowCallback(RESULTSET *set, void *data)
|
|
{
|
|
SESSIONFILTER *cbdata = (SESSIONFILTER*)data;
|
|
RESULT_ROW *row = NULL;
|
|
|
|
cbdata->current = 0;
|
|
dcb_foreach(dcb_iter_cb, cbdata);
|
|
|
|
if (cbdata->row)
|
|
{
|
|
row = cbdata->row;
|
|
cbdata->row = NULL;
|
|
}
|
|
|
|
return row;
|
|
}
|
|
|
|
/**
|
|
* Return a resultset that has the current set of sessions in it
|
|
*
|
|
* @return A Result set
|
|
*/
|
|
/* Lint is not convinced that the new memory for data is always tracked
|
|
* because it does not see what happens within the resultset_create function,
|
|
* so we suppress the warning. In fact, the function call results in return
|
|
* of the set structure which includes a pointer to data
|
|
*/
|
|
|
|
/*lint -e429 */
|
|
RESULTSET *
|
|
sessionGetList(SESSIONLISTFILTER filter)
|
|
{
|
|
RESULTSET *set;
|
|
SESSIONFILTER *data;
|
|
|
|
if ((data = (SESSIONFILTER *)MXS_MALLOC(sizeof(SESSIONFILTER))) == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
data->index = 0;
|
|
data->filter = filter;
|
|
data->current = 0;
|
|
data->row = NULL;
|
|
|
|
if ((set = resultset_create(sessionRowCallback, data)) == NULL)
|
|
{
|
|
MXS_FREE(data);
|
|
return NULL;
|
|
}
|
|
|
|
data->set = set;
|
|
resultset_add_column(set, "Session", 16, COL_TYPE_VARCHAR);
|
|
resultset_add_column(set, "Client", 15, COL_TYPE_VARCHAR);
|
|
resultset_add_column(set, "Service", 15, COL_TYPE_VARCHAR);
|
|
resultset_add_column(set, "State", 15, COL_TYPE_VARCHAR);
|
|
|
|
return set;
|
|
}
|
|
/*lint +e429 */
|
|
|
|
mxs_session_trx_state_t session_get_trx_state(const MXS_SESSION* ses)
|
|
{
|
|
return ses->trx_state;
|
|
}
|
|
|
|
mxs_session_trx_state_t session_set_trx_state(MXS_SESSION* ses, mxs_session_trx_state_t new_state)
|
|
{
|
|
mxs_session_trx_state_t prev_state = ses->trx_state;
|
|
|
|
ses->trx_state = new_state;
|
|
|
|
return prev_state;
|
|
}
|
|
|
|
const char* session_trx_state_to_string(mxs_session_trx_state_t state)
|
|
{
|
|
switch (state)
|
|
{
|
|
case SESSION_TRX_INACTIVE:
|
|
return "SESSION_TRX_INACTIVE";
|
|
case SESSION_TRX_ACTIVE:
|
|
return "SESSION_TRX_ACTIVE";
|
|
case SESSION_TRX_READ_ONLY:
|
|
return "SESSION_TRX_READ_ONLY";
|
|
case SESSION_TRX_READ_WRITE:
|
|
return "SESSION_TRX_READ_WRITE";
|
|
case SESSION_TRX_READ_ONLY_ENDING:
|
|
return "SESSION_TRX_READ_ONLY_ENDING";
|
|
case SESSION_TRX_READ_WRITE_ENDING:
|
|
return "SESSION_TRX_READ_WRITE_ENDING";
|
|
}
|
|
|
|
MXS_ERROR("Unknown session_trx_state_t value: %d", (int)state);
|
|
return "UNKNOWN";
|
|
}
|
|
|
|
static bool ses_find_id(DCB *dcb, void *data)
|
|
{
|
|
void **params = (void**)data;
|
|
MXS_SESSION **ses = (MXS_SESSION**)params[0];
|
|
int *id = (int*)params[1];
|
|
bool rval = true;
|
|
|
|
if (dcb->session->ses_id == *id)
|
|
{
|
|
*ses = session_get_ref(dcb->session);
|
|
rval = false;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
MXS_SESSION* session_get_by_id(int id)
|
|
{
|
|
MXS_SESSION *session = NULL;
|
|
void *params[] = {&session, &id};
|
|
|
|
dcb_foreach(ses_find_id, params);
|
|
|
|
return session;
|
|
}
|
|
|
|
MXS_SESSION* session_get_ref(MXS_SESSION *session)
|
|
{
|
|
atomic_add(&session->refcount, 1);
|
|
return session;
|
|
}
|
|
|
|
void session_put_ref(MXS_SESSION *session)
|
|
{
|
|
if (session && session->state != SESSION_STATE_DUMMY)
|
|
{
|
|
/** Remove one reference. If there are no references left, free session */
|
|
if (atomic_add(&session->refcount, -1) == 1)
|
|
{
|
|
session_free(session);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool session_store_stmt(MXS_SESSION *session, GWBUF *buf, const SERVER *server)
|
|
{
|
|
bool rval = false;
|
|
|
|
if (session->stmt.buffer)
|
|
{
|
|
/** This should not happen with proper use */
|
|
ss_dassert(false);
|
|
gwbuf_free(session->stmt.buffer);
|
|
}
|
|
|
|
if ((session->stmt.buffer = gwbuf_clone(buf)))
|
|
{
|
|
session->stmt.target = server;
|
|
/** No old statements were stored and we successfully cloned the buffer */
|
|
rval = true;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
bool session_take_stmt(MXS_SESSION *session, GWBUF **buffer, const SERVER **target)
|
|
{
|
|
bool rval = false;
|
|
|
|
if (session->stmt.buffer && session->stmt.target)
|
|
{
|
|
*buffer = session->stmt.buffer;
|
|
*target = session->stmt.target;
|
|
session->stmt.buffer = NULL;
|
|
session->stmt.target = NULL;
|
|
rval = true;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
void session_clear_stmt(MXS_SESSION *session)
|
|
{
|
|
gwbuf_free(session->stmt.buffer);
|
|
session->stmt.buffer = NULL;
|
|
session->stmt.target = NULL;
|
|
}
|
|
|
|
void session_qualify_for_pool(MXS_SESSION* session)
|
|
{
|
|
session->qualifies_for_pooling = true;
|
|
}
|
|
|
|
bool session_valid_for_pool(const MXS_SESSION* session)
|
|
{
|
|
ss_dassert(session->state != SESSION_STATE_DUMMY);
|
|
return session->qualifies_for_pooling;
|
|
}
|
|
|
|
MXS_SESSION* session_get_current()
|
|
{
|
|
DCB* dcb = dcb_get_current();
|
|
|
|
return dcb ? dcb->session : NULL;
|
|
}
|
|
|
|
uint64_t session_get_current_id()
|
|
{
|
|
MXS_SESSION* session = session_get_current();
|
|
|
|
return session ? session->ses_id : 0;
|
|
}
|