mirror of https://gitee.com/bigwinds/arangodb
799 lines
25 KiB
C++
799 lines
25 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief single-server state
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2010-2012 triagens GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2013, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "ServerState.h"
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#include "Basics/JsonHelper.h"
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#include "Basics/ReadLocker.h"
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#include "Basics/WriteLocker.h"
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#include "BasicsC/logging.h"
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#include "Cluster/AgencyComm.h"
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#include "Cluster/ClusterInfo.h"
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using namespace triagens::arango;
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// -----------------------------------------------------------------------------
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// --SECTION-- ServerState
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor
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////////////////////////////////////////////////////////////////////////////////
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ServerState::ServerState ()
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: _id(),
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_address(),
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_authentication(),
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_lock(),
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_role(ROLE_UNDEFINED),
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_state(STATE_UNDEFINED),
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_initialised(false) {
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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ServerState::~ServerState () {
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public static methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the actual singleton instance
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////////////////////////////////////////////////////////////////////////////////
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ServerState* ServerState::_theinstance = 0;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the (sole) instance
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////////////////////////////////////////////////////////////////////////////////
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ServerState* ServerState::instance () {
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assert(_theinstance != 0);
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return _theinstance;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initialise the server state singleton object
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::initialise () {
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assert(_theinstance == 0);
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_theinstance = new ServerState(); // this now happens exactly once
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the string representation of a role
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////////////////////////////////////////////////////////////////////////////////
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std::string ServerState::roleToString (RoleEnum role) {
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switch (role) {
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case ROLE_UNDEFINED:
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return "UNDEFINED";
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case ROLE_PRIMARY:
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return "PRIMARY";
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case ROLE_SECONDARY:
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return "SECONDARY";
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case ROLE_COORDINATOR:
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return "COORDINATOR";
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}
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assert(false);
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return "";
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief convert a string to a role
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////////////////////////////////////////////////////////////////////////////////
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ServerState::RoleEnum ServerState::stringToRole (std::string const& value) {
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if (value == "PRIMARY") {
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return ROLE_PRIMARY;
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}
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else if (value == "SECONDARY") {
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return ROLE_SECONDARY;
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}
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else if (value == "COORDINATOR") {
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return ROLE_COORDINATOR;
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}
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return ROLE_UNDEFINED;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief convert a string representation to a state
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////////////////////////////////////////////////////////////////////////////////
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ServerState::StateEnum ServerState::stringToState (std::string const& value) {
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if (value == "SHUTDOWN") {
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return STATE_SHUTDOWN;
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}
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// TODO: do we need to understand other states, too?
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return STATE_UNDEFINED;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the string representation of a state
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////////////////////////////////////////////////////////////////////////////////
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std::string ServerState::stateToString (StateEnum state) {
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switch (state) {
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case STATE_UNDEFINED:
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return "UNDEFINED";
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case STATE_STARTUP:
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return "STARTUP";
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case STATE_SERVINGASYNC:
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return "SERVINGASYNC";
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case STATE_SERVINGSYNC:
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return "SERVINGSYNC";
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case STATE_STOPPING:
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return "STOPPING";
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case STATE_STOPPED:
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return "STOPPED";
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case STATE_SYNCING:
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return "SYNCING";
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case STATE_INSYNC:
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return "INSYNC";
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case STATE_LOSTPRIMARY:
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return "LOSTPRIMARY";
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case STATE_SERVING:
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return "SERVING";
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case STATE_SHUTDOWN:
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return "SHUTDOWN";
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}
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assert(false);
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return "";
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the authentication data for cluster-internal communication
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setAuthentication (std::string const& username,
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std::string const& password) {
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_authentication = "Basic " + basics::StringUtils::encodeBase64(username + ":" + password);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the authentication data for cluster-internal communication
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////////////////////////////////////////////////////////////////////////////////
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std::string ServerState::getAuthentication () {
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return _authentication;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief flush the server state (used for testing)
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::flush () {
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WRITE_LOCKER(_lock);
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if (_id.empty()) {
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return;
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}
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_address = ClusterInfo::instance()->getTargetServerEndpoint(_id);
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_role = determineRole(_id);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief check whether the server is a coordinator
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////////////////////////////////////////////////////////////////////////////////
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bool ServerState::isCoordinator () {
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READ_LOCKER(_lock);
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return (_role == ServerState::ROLE_COORDINATOR);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief check whether the server is a DB server (primary or secondory)
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/// running in cluster mode.
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////////////////////////////////////////////////////////////////////////////////
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bool ServerState::isDBserver () {
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READ_LOCKER(_lock);
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return (_role == ServerState::ROLE_PRIMARY ||
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_role == ServerState::ROLE_SECONDARY);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief check whether the server is running in a cluster
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////////////////////////////////////////////////////////////////////////////////
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bool ServerState::isRunningInCluster () {
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READ_LOCKER(_lock);
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return (_role == ServerState::ROLE_PRIMARY ||
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_role == ServerState::ROLE_SECONDARY ||
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_role == ServerState::ROLE_COORDINATOR);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the server id
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////////////////////////////////////////////////////////////////////////////////
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ServerState::RoleEnum ServerState::getRole () {
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std::string id;
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{
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READ_LOCKER(_lock);
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if (_role != ServerState::ROLE_UNDEFINED) {
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return _role;
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}
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id = _id;
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}
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// role not yet set
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RoleEnum role = determineRole(id);
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{
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WRITE_LOCKER(_lock);
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_role = role;
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}
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return role;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the server role
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setRole (RoleEnum role) {
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WRITE_LOCKER(_lock);
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_role = role;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the server id
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////////////////////////////////////////////////////////////////////////////////
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std::string ServerState::getId () {
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READ_LOCKER(_lock);
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return _id;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the server id
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setId (std::string const& id) {
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if (id.empty()) {
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return;
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}
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WRITE_LOCKER(_lock);
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_id = id;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the server address
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////////////////////////////////////////////////////////////////////////////////
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std::string ServerState::getAddress () {
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std::string id;
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{
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READ_LOCKER(_lock);
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if (! _address.empty()) {
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return _address;
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}
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id = _id;
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}
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// address not yet set
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if (id.empty()) {
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return "";
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}
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// fetch and set the address
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std::string const address = ClusterInfo::instance()->getTargetServerEndpoint(id);
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{
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WRITE_LOCKER(_lock);
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_address = address;
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}
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return address;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the server address
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setAddress (std::string const& address) {
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if (address.empty()) {
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return;
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}
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WRITE_LOCKER(_lock);
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_address = address;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the current state
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////////////////////////////////////////////////////////////////////////////////
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ServerState::StateEnum ServerState::getState () {
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READ_LOCKER(_lock);
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return _state;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the current state
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setState (StateEnum state) {
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bool result = false;
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WRITE_LOCKER(_lock);
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if (state == _state) {
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return;
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}
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if (_role == ROLE_PRIMARY) {
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result = checkPrimaryState(state);
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}
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else if (_role == ROLE_SECONDARY) {
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result = checkSecondaryState(state);
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}
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else if (_role == ROLE_COORDINATOR) {
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result = checkCoordinatorState(state);
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}
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if (result) {
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LOG_INFO("changing state of %s server from %s to %s",
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ServerState::roleToString(_role).c_str(),
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ServerState::stateToString(_state).c_str(),
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ServerState::stateToString(state).c_str());
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_state = state;
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}
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else {
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LOG_ERROR("invalid state transition for %s server from %s to %s",
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ServerState::roleToString(_role).c_str(),
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ServerState::stateToString(_state).c_str(),
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ServerState::stateToString(state).c_str());
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the data path
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////////////////////////////////////////////////////////////////////////////////
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string ServerState::getDataPath () {
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READ_LOCKER(_lock);
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return _dataPath;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the data path
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setDataPath (const string& value) {
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WRITE_LOCKER(_lock);
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_dataPath = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the log path
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////////////////////////////////////////////////////////////////////////////////
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string ServerState::getLogPath () {
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READ_LOCKER(_lock);
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return _logPath;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the log path
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setLogPath (const string& value) {
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WRITE_LOCKER(_lock);
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_logPath = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the agent path
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////////////////////////////////////////////////////////////////////////////////
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string ServerState::getAgentPath () {
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READ_LOCKER(_lock);
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return _agentPath;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the data path
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setAgentPath (const string& value) {
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WRITE_LOCKER(_lock);
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_agentPath = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the arangod path
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////////////////////////////////////////////////////////////////////////////////
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string ServerState::getArangodPath () {
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READ_LOCKER(_lock);
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return _arangodPath;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the arangod path
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setArangodPath (const string& value) {
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WRITE_LOCKER(_lock);
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_arangodPath = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the JavaScript startup path
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////////////////////////////////////////////////////////////////////////////////
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string ServerState::getJavaScriptPath () {
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READ_LOCKER(_lock);
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return _javaScriptStartupPath;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the arangod path
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setJavaScriptPath (const string& value) {
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WRITE_LOCKER(_lock);
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_javaScriptStartupPath = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the DBserver config
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////////////////////////////////////////////////////////////////////////////////
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string ServerState::getDBserverConfig () {
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READ_LOCKER(_lock);
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return _dbserverConfig;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the DBserver config
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setDBserverConfig (const string& value) {
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WRITE_LOCKER(_lock);
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_dbserverConfig = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the coordinator config
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////////////////////////////////////////////////////////////////////////////////
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string ServerState::getCoordinatorConfig () {
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READ_LOCKER(_lock);
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return _coordinatorConfig;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the coordinator config
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setCoordinatorConfig (const string& value) {
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WRITE_LOCKER(_lock);
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_coordinatorConfig = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the disable dispatcher frontend flag
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////////////////////////////////////////////////////////////////////////////////
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bool ServerState::getDisableDispatcherFrontend () {
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READ_LOCKER(_lock);
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return _disableDispatcherFrontend;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the disable dispatcher frontend flag
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setDisableDispatcherFrontend (bool value) {
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WRITE_LOCKER(_lock);
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_disableDispatcherFrontend = value;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief gets the disable dispatcher kickstarter flag
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////////////////////////////////////////////////////////////////////////////////
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bool ServerState::getDisableDispatcherKickstarter () {
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READ_LOCKER(_lock);
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return _disableDispatcherKickstarter;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets the disable dispatcher kickstarter flag
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////////////////////////////////////////////////////////////////////////////////
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void ServerState::setDisableDispatcherKickstarter (bool value) {
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WRITE_LOCKER(_lock);
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_disableDispatcherKickstarter = value;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief determine the server role by fetching data from the agency
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/// Note: this method must be called under the _lock
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////////////////////////////////////////////////////////////////////////////////
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ServerState::RoleEnum ServerState::determineRole (std::string const& id) {
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if (id.empty()) {
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return ServerState::ROLE_UNDEFINED;
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}
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ServerState::RoleEnum role = checkServersList(id);
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ServerState::RoleEnum role2 = checkCoordinatorsList(id);
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if (role == ServerState::ROLE_UNDEFINED) {
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// role is still unknown. check if we are a coordinator
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role = role2;
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}
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else {
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// we are a primary or a secondary.
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// now we double-check that we are not a coordinator as well
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if (role2 != ServerState::ROLE_UNDEFINED) {
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role = ServerState::ROLE_UNDEFINED;
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}
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}
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return role;
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}
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|
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////////////////////////////////////////////////////////////////////////////////
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/// @brief validate a state transition for a primary server
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////////////////////////////////////////////////////////////////////////////////
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bool ServerState::checkPrimaryState (StateEnum state) {
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if (state == STATE_STARTUP) {
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// startup state can only be set once
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return (_state == STATE_UNDEFINED);
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}
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else if (state == STATE_SERVINGASYNC) {
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return (_state == STATE_STARTUP ||
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_state == STATE_STOPPED);
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}
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else if (state == STATE_SERVINGSYNC) {
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return (_state == STATE_STARTUP ||
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_state == STATE_SERVINGASYNC ||
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_state == STATE_STOPPED);
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}
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else if (state == STATE_STOPPING) {
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return (_state == STATE_SERVINGSYNC ||
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_state == STATE_SERVINGASYNC);
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}
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else if (state == STATE_STOPPED) {
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return (_state == STATE_STOPPING);
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}
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else if (state == STATE_SHUTDOWN) {
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return (_state == STATE_STARTUP ||
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_state == STATE_STOPPED ||
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_state == STATE_SERVINGSYNC ||
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_state == STATE_SERVINGASYNC);
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}
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// anything else is invalid
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return false;
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}
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|
|
////////////////////////////////////////////////////////////////////////////////
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|
/// @brief validate a state transition for a secondary server
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|
////////////////////////////////////////////////////////////////////////////////
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|
|
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bool ServerState::checkSecondaryState (StateEnum state) {
|
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if (state == STATE_STARTUP) {
|
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// startup state can only be set once
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return (_state == STATE_UNDEFINED);
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}
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else if (state == STATE_SYNCING) {
|
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return (_state == STATE_STARTUP ||
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_state == STATE_LOSTPRIMARY);
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}
|
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else if (state == STATE_INSYNC) {
|
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return (_state == STATE_SYNCING);
|
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}
|
|
else if (state == STATE_LOSTPRIMARY) {
|
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return (_state == STATE_SYNCING ||
|
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_state == STATE_INSYNC);
|
|
}
|
|
else if (state == STATE_SERVING) {
|
|
return (_state == STATE_STARTUP);
|
|
}
|
|
else if (state == STATE_SHUTDOWN) {
|
|
return (_state == STATE_STARTUP ||
|
|
_state == STATE_SYNCING ||
|
|
_state == STATE_INSYNC ||
|
|
_state == STATE_LOSTPRIMARY);
|
|
}
|
|
|
|
// anything else is invalid
|
|
return false;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief validate a state transition for a coordinator server
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
bool ServerState::checkCoordinatorState (StateEnum state) {
|
|
if (state == STATE_STARTUP) {
|
|
// startup state can only be set once
|
|
return (_state == STATE_UNDEFINED);
|
|
}
|
|
else if (state == STATE_SERVING) {
|
|
return (_state == STATE_STARTUP);
|
|
}
|
|
else if (state == STATE_SHUTDOWN) {
|
|
return (_state == STATE_STARTUP ||
|
|
_state == STATE_SERVING);
|
|
}
|
|
|
|
// anything else is invalid
|
|
return false;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief lookup the server role by scanning Plan/Coordinators for our id
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
ServerState::RoleEnum ServerState::checkCoordinatorsList (std::string const& id) {
|
|
// fetch value at Plan/Coordinators
|
|
// we need to do this to determine the server's role
|
|
|
|
const std::string key = "Plan/Coordinators";
|
|
|
|
AgencyComm comm;
|
|
AgencyCommResult result;
|
|
|
|
{
|
|
AgencyCommLocker locker("Plan", "READ");
|
|
|
|
if (locker.successful()) {
|
|
result = comm.getValues(key, true);
|
|
}
|
|
}
|
|
|
|
if (! result.successful()) {
|
|
const std::string endpoints = AgencyComm::getEndpointsString();
|
|
|
|
LOG_TRACE("Could not fetch configuration from agency endpoints (%s): "
|
|
"got status code %d, message: %s, key: %s",
|
|
endpoints.c_str(),
|
|
result._statusCode,
|
|
result.errorMessage().c_str(),
|
|
key.c_str());
|
|
|
|
return ServerState::ROLE_UNDEFINED;
|
|
}
|
|
|
|
if (! result.parse("Plan/Coordinators/", false)) {
|
|
LOG_TRACE("Got an invalid JSON response for Plan/Coordinators");
|
|
|
|
return ServerState::ROLE_UNDEFINED;
|
|
}
|
|
|
|
// check if we can find ourselves in the list returned by the agency
|
|
std::map<std::string, AgencyCommResultEntry>::const_iterator it = result._values.find(id);
|
|
|
|
if (it != result._values.end()) {
|
|
// we are in the list. this means we are a primary server
|
|
return ServerState::ROLE_COORDINATOR;
|
|
}
|
|
|
|
return ServerState::ROLE_UNDEFINED;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief lookup the server role by scanning Plan/DBServers for our id
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
ServerState::RoleEnum ServerState::checkServersList (std::string const& id) {
|
|
// fetch value at Plan/DBServers
|
|
// we need to do this to determine the server's role
|
|
|
|
const std::string key = "Plan/DBServers";
|
|
|
|
AgencyComm comm;
|
|
AgencyCommResult result;
|
|
|
|
{
|
|
AgencyCommLocker locker("Plan", "READ");
|
|
|
|
if (locker.successful()) {
|
|
result = comm.getValues(key, true);
|
|
}
|
|
}
|
|
|
|
if (! result.successful()) {
|
|
const std::string endpoints = AgencyComm::getEndpointsString();
|
|
|
|
LOG_TRACE("Could not fetch configuration from agency endpoints (%s): "
|
|
"got status code %d, message: %s, key: %s",
|
|
endpoints.c_str(),
|
|
result._statusCode,
|
|
result.errorMessage().c_str(),
|
|
key.c_str());
|
|
|
|
return ServerState::ROLE_UNDEFINED;
|
|
}
|
|
|
|
ServerState::RoleEnum role = ServerState::ROLE_UNDEFINED;
|
|
|
|
// check if we can find ourselves in the list returned by the agency
|
|
result.parse("Plan/DBServers/", false);
|
|
std::map<std::string, AgencyCommResultEntry>::const_iterator it = result._values.find(id);
|
|
|
|
if (it != result._values.end()) {
|
|
// we are in the list. this means we are a primary server
|
|
role = ServerState::ROLE_PRIMARY;
|
|
}
|
|
else {
|
|
// check if we are a secondary...
|
|
it = result._values.begin();
|
|
|
|
while (it != result._values.end()) {
|
|
const std::string name = triagens::basics::JsonHelper::getStringValue((*it).second._json, "");
|
|
|
|
if (name == id) {
|
|
role = ServerState::ROLE_SECONDARY;
|
|
break;
|
|
}
|
|
|
|
++it;
|
|
}
|
|
}
|
|
|
|
return role;
|
|
}
|
|
|
|
// Local Variables:
|
|
// mode: outline-minor
|
|
// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
|
|
// End:
|
|
|