connection-manager.test.js
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'use strict';
const chai = require('chai'),
expect = chai.expect,
Support = require('../../support'),
sinon = require('sinon'),
Config = require('../../../config/config'),
ConnectionManager = require('../../../../lib/dialects/abstract/connection-manager'),
Pool = require('sequelize-pool').Pool;
const baseConf = Config[Support.getTestDialect()];
const poolEntry = {
host: baseConf.host,
port: baseConf.port,
pool: {}
};
describe('Connection Manager', () => {
let sandbox;
beforeEach(() => {
sandbox = sinon.createSandbox();
});
afterEach(() => {
sandbox.restore();
});
it('should initialize a single pool without replication', () => {
const options = {
replication: null
};
const sequelize = Support.createSequelizeInstance(options);
const connectionManager = new ConnectionManager(Support.getTestDialect(), sequelize);
connectionManager.initPools();
expect(connectionManager.pool).to.be.instanceOf(Pool);
expect(connectionManager.pool.read).to.be.undefined;
expect(connectionManager.pool.write).to.be.undefined;
});
it('should initialize a multiple pools with replication', () => {
const options = {
replication: {
write: { ...poolEntry },
read: [{ ...poolEntry }, { ...poolEntry }]
}
};
const sequelize = Support.createSequelizeInstance(options);
const connectionManager = new ConnectionManager(Support.getTestDialect(), sequelize);
connectionManager.initPools();
expect(connectionManager.pool.read).to.be.instanceOf(Pool);
expect(connectionManager.pool.write).to.be.instanceOf(Pool);
});
it('should round robin calls to the read pool', () => {
if (Support.getTestDialect() === 'sqlite') {
return;
}
const slave1 = { ...poolEntry };
const slave2 = { ...poolEntry };
slave1.host = 'slave1';
slave2.host = 'slave2';
const options = {
replication: {
write: { ...poolEntry },
read: [slave1, slave2]
}
};
const sequelize = Support.createSequelizeInstance(options);
const connectionManager = new ConnectionManager(Support.getTestDialect(), sequelize);
const res = {
queryType: 'read'
};
const connectStub = sandbox.stub(connectionManager, '_connect').resolves(res);
sandbox.stub(connectionManager, '_disconnect').resolves(res);
sandbox.stub(sequelize, 'databaseVersion').resolves(res);
connectionManager.initPools();
const queryOptions = {
priority: 0,
type: 'SELECT',
useMaster: false
};
const _getConnection = connectionManager.getConnection.bind(connectionManager, queryOptions);
return _getConnection()
.then(_getConnection)
.then(_getConnection)
.then(() => {
chai.expect(connectStub.callCount).to.equal(4);
// First call is the get connection for DB versions - ignore
const calls = connectStub.getCalls();
chai.expect(calls[1].args[0].host).to.eql('slave1');
chai.expect(calls[2].args[0].host).to.eql('slave2');
chai.expect(calls[3].args[0].host).to.eql('slave1');
});
});
it('should allow forced reads from the write pool', () => {
const master = { ...poolEntry };
master.host = 'the-boss';
const options = {
replication: {
write: master,
read: [{ ...poolEntry }]
}
};
const sequelize = Support.createSequelizeInstance(options);
const connectionManager = new ConnectionManager(Support.getTestDialect(), sequelize);
const res = {
queryType: 'read'
};
const connectStub = sandbox.stub(connectionManager, '_connect').resolves(res);
sandbox.stub(connectionManager, '_disconnect').resolves(res);
sandbox.stub(sequelize, 'databaseVersion').resolves(res);
connectionManager.initPools();
const queryOptions = {
priority: 0,
type: 'SELECT',
useMaster: true
};
return connectionManager.getConnection(queryOptions)
.then(() => {
chai.expect(connectStub).to.have.been.calledTwice; // Once to get DB version, and once to actually get the connection.
const calls = connectStub.getCalls();
chai.expect(calls[1].args[0].host).to.eql('the-boss');
});
});
it('should clear the pool after draining it', () => {
const options = {
replication: null
};
const sequelize = Support.createSequelizeInstance(options);
const connectionManager = new ConnectionManager(Support.getTestDialect(), sequelize);
connectionManager.initPools();
const poolDrainSpy = sandbox.spy(connectionManager.pool, 'drain');
const poolClearSpy = sandbox.spy(connectionManager.pool, 'destroyAllNow');
return connectionManager.close().then(() => {
expect(poolDrainSpy.calledOnce).to.be.true;
expect(poolClearSpy.calledOnce).to.be.true;
});
});
});