7165b4306f
The hintrouter is now in principle capable of routing requests to the master or to some slave (in a round robin fashion) based upon hints set by some earlier filter. Note that as the router is completely oblivious of transaction boundaries, using it with transactions and autocommit being off will not make anyone happy. Recognizing transaction boundaries using regexes and then pinning the server until transaction commit would be needed.
110 lines
2.7 KiB
C++
110 lines
2.7 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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#define MXS_MODULE_NAME "hintrouter"
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#include "hintrouter.hh"
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#include <maxscale/log_manager.h>
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#include "dcb.hh"
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HintRouter::HintRouter(SERVICE* pService)
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: maxscale::Router<HintRouter, HintRouterSession>(pService)
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{
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HR_ENTRY();
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MXS_NOTICE("Hint router [%s] created.", pService->name);
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}
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//static
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HintRouter* HintRouter::create(SERVICE* pService, char** pzOptions)
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{
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HR_ENTRY();
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return new HintRouter(pService);
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}
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HintRouterSession* HintRouter::newSession(MXS_SESSION *pSession)
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{
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HR_ENTRY();
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HintRouterSession* pRouterSession = NULL;
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HintRouterSession::Backends backends;
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for (SERVER_REF* pSref = m_pService->dbref; pSref; pSref = pSref->next)
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{
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if (SERVER_REF_IS_ACTIVE(pSref))
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{
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SERVER* pServer = pSref->server;
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HR_DEBUG("Connecting to %s.", pServer->name);
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DCB* pDcb = dcb_connect(pServer, pSession, pServer->protocol);
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if (pDcb)
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{
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HR_DEBUG("Connected to %p %s.", pDcb, pServer->name);
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// TODO: What's done here, should be done by dcb_connect().
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atomic_add(&pSref->connections, 1);
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pDcb->service = pSession->service;
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backends.push_back(Dcb(pDcb));
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}
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else
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{
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HR_DEBUG("Failed to connect to %s.", pServer->name);
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}
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}
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}
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if (backends.size() != 0)
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{
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pRouterSession = new HintRouterSession(pSession, this, backends);
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}
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return pRouterSession;
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}
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void HintRouter::diagnostics(DCB* pOut)
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{
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HR_ENTRY();
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}
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uint64_t HintRouter::getCapabilities()
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{
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HR_ENTRY();
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return RCAP_TYPE_STMT_OUTPUT;
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}
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extern "C" MXS_MODULE* MXS_CREATE_MODULE()
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{
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static MXS_MODULE module =
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{
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MXS_MODULE_API_ROUTER, /* Module type */
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MXS_MODULE_BETA_RELEASE, /* Release status */
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MXS_ROUTER_VERSION, /* Implemented module API version */
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"A hint router", /* Description */
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"V1.0.0", /* Module version */
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&HintRouter::s_object,
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NULL, /* Process init, can be null */
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NULL, /* Process finish, can be null */
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NULL, /* Thread init */
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NULL, /* Thread finish */
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{
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{MXS_END_MODULE_PARAMS}
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}
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};
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return &module;
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}
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