89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
// rs_config.h
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// repl set configuration
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//
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "../../util/hostandport.h"
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#include "health.h"
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namespace mongo {
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/* singleton config object is stored here */
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const string rsConfigNs = "local.system.replset";
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class ReplSetConfig {
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enum { EMPTYCONFIG = -2 };
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public:
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/* if something is misconfigured, throws an exception.
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if couldn't be queried or is just blank, ok() will be false.
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*/
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ReplSetConfig(const HostAndPort& h);
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ReplSetConfig(BSONObj cfg);
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bool ok() const { return _ok; }
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struct MemberCfg {
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MemberCfg() : _id(-1), votes(1), priority(1.0), arbiterOnly(false) { }
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int _id; /* ordinal */
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unsigned votes; /* how many votes this node gets. default 1. */
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HostAndPort h;
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double priority; /* 0 means can never be primary */
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bool arbiterOnly;
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void check() const; /* check validity, assert if not. */
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BSONObj asBson() const;
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bool potentiallyHot() const {
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return !arbiterOnly && priority > 0;
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}
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};
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vector<MemberCfg> members;
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string _id;
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int version;
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HealthOptions ho;
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string md5;
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BSONObj getLastErrorDefaults;
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list<HostAndPort> otherMemberHostnames() const; // except self
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/** @return true if could connect, and there is no cfg object there at all */
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bool empty() const { return version == EMPTYCONFIG; }
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string toString() const { return asBson().toString(); }
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/** validate the settings. does not call check() on each member, you have to do that separately. */
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void check() const;
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/** check if modification makes sense */
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static bool legalChange(const ReplSetConfig& old, const ReplSetConfig& n, string& errmsg);
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//static void receivedNewConfig(BSONObj);
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void saveConfigLocally(BSONObj comment); // to local db
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string saveConfigEverywhere(); // returns textual info on what happened
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BSONObj asBson() const;
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private:
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bool _ok;
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void from(BSONObj);
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void clear();
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};
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}
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