connection-manager.js
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"use strict";
var Pooling = require('generic-pool')
, Promise = require('./promise')
, _ = require('lodash')
, defaultPoolingConfig = {
max: 10,
min: 0,
idle: 10000,
handleDisconnects: false
}
, ConnectionManager;
ConnectionManager = function(sequelize) {
var config = sequelize.config
, self = this;
this.config = config;
this.dialect = sequelize.dialect;
if (config.pool) {
config.pool = _.extend({}, config.pool); // Make sure we don't modify the existing config object (user might re-use it)
config.pool =_.defaults(config.pool, defaultPoolingConfig, {
validate: this.$validate.bind(this)
}) ;
} else {
// If the user has turned off pooling we provide a 0/1 pool for backwards compat
config.pool = _.defaults({
max: 1,
min: 0,
}, defaultPoolingConfig, {
validate: this.$validate.bind(this)
});
}
// Map old names
if (config.pool.maxIdleTime) config.pool.idle = config.pool.maxIdleTime;
if (config.pool.maxConnections) config.pool.max = config.pool.maxConnections;
if (config.pool.minConnections) config.pool.min = config.pool.minConnections;
if (config.replication) {
var reads = 0
, writes = 0;
// Make sure we don't modify the existing config object (user might re-use it)
config.replication.write = _.extend({}, config.replication.write);
config.replication.read = config.replication.read.map(function (read) {
return _.extend({}, read);
});
// Map main connection config
config.replication.write = _.defaults(config.replication.write, {
host: config.host,
port: config.port,
username: config.username,
password: config.password,
database: config.database
});
for (var i = 0; i < config.replication.read.length; i++) {
config.replication.read[i] = _.defaults(config.replication.read[i], {
host: this.config.host,
port: this.config.port,
username: this.config.username,
password: this.config.password,
database: this.config.database
});
}
// I'll make my own pool, with blackjack and hookers! (original credit goes to @janzeh)
this.pool = {
release: function(client) {
if (client.queryType === 'read') {
return self.pool.read.release(client);
} else {
return self.pool.write.release(client);
}
},
acquire: function(callback, priority, queryType) {
if (queryType === 'SELECT') {
self.pool.read.acquire(callback, priority);
} else {
self.pool.write.acquire(callback, priority);
}
},
drain: function() {
self.pool.read.drain();
self.pool.write.drain();
},
read: Pooling.Pool({
name: 'sequelize-connection-read',
create: function(done) {
if (reads >= config.replication.read.length) {
reads = 0;
}
// Simple round robin config
self.$connect(config.replication.read[reads++]).then(function (connection) {
connection.queryType = 'read';
}).nodeify(done);
},
destroy: function(connection) {
self.$disconnect(connection);
},
validate: config.pool.validate,
max: config.pool.max,
min: config.pool.min,
idleTimeoutMillis: config.pool.idle
}),
write: Pooling.Pool({
name: 'sequelize-connection-write',
create: function(done) {
self.$connect(config.replication.write).then(function (connection) {
connection.queryType = 'write';
}).nodeify(done);
},
destroy: function(connection) {
self.$disconnect(connection);
},
validate: config.pool.validate,
max: config.pool.max,
min: config.pool.min,
idleTimeoutMillis: config.pool.idle
})
};
} else {
this.pool = Pooling.Pool({
name: 'sequelize-connection',
create: function(done) {
self.$connect(config).nodeify(done);
},
destroy: function(connection) {
self.$disconnect(connection);
},
max: config.pool.max,
min: config.pool.min,
validate: config.pool.validate,
idleTimeoutMillis: config.pool.idle
});
}
this.onProcessExit = function() {
// Cleanup
self.pool.drain();
return;
}.bind(this);
process.on('exit', this.onProcessExit);
};
ConnectionManager.prototype.getConnection = function(options) {
var self = this;
options = options || {};
return new Promise(function (resolve, reject) {
self.pool.acquire(function(err, connection) {
if (err) return reject(err);
resolve(connection);
}, options.priority, options.type);
});
};
ConnectionManager.prototype.releaseConnection = function(connection) {
var self = this;
return new Promise(function (resolve, reject) {
self.pool.release(connection);
resolve();
});
};
ConnectionManager.prototype.$connect = function(config) {
return this.dialect.connectionManager.connect(config);
};
ConnectionManager.prototype.$disconnect = function(connection) {
return this.dialect.connectionManager.disconnect(connection);
};
ConnectionManager.prototype.$validate = function(connection) {
if (!this.dialect.connectionManager.validate) return Promise.resolve();
return this.dialect.connectionManager.validate(connection);
};
module.exports = ConnectionManager;