migrator.js
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const fs = require("fs")
, path = require("path")
, moment = require("moment")
var Utils = require("./utils")
, Migration = require("./migration")
, DataTypes = require("./data-types")
module.exports = (function() {
var Migrator = function(sequelize, options) {
this.sequelize = sequelize
this.options = Utils._.extend({
path: __dirname + '/../migrations',
from: null,
to: null
}, options || {})
}
Object.defineProperty(Migrator.prototype, "queryInterface", {
get: function() {
return this.sequelize.getQueryInterface()
}
})
Migrator.prototype.migrate = function(options) {
var self = this
options = Utils._.extend({
method: 'up'
}, options || {})
return new Utils.CustomEventEmitter(function(emitter) {
self.getUndoneMigrations(function(migrations) {
var chainer = new Utils.QueryChainer
if(options.method == 'down')
migrations.reverse()
migrations.forEach(function(migration) {
chainer.add(migration.execute(options))
})
chainer
.run()
.success(function() { emitter.emit('success', null) })
.error(function(err) { emitter.emit('failure', err) })
})
}).run()
}
Migrator.prototype.getUndoneMigrations = function(callback) {
var self = this
var filterFrom = function(migrations, from, callback, options) {
var result = migrations.filter(function(migration) { return migration.isAfter(from, options) })
callback && callback(result)
}
var filterTo = function(migrations, to, callback, options) {
var result = migrations.filter(function(migration) { return migration.isBefore(to, options) })
callback && callback(result)
}
var migrationFiles = fs.readdirSync(this.options.path)
var migrations = migrationFiles.map(function(file) {
return new Migration(self, self.options.path + '/' + file)
})
if(this.options.from) {
filterFrom(migrations, this.options.from, function(migrations) {
if(self.options.to)
filterTo(migrations, self.options.to, callback)
else
callback && callback(migrations)
})
} else {
getLastMigrationIdFromDatabase.call(this).success(function(lastMigrationId) {
if(lastMigrationId) {
filterFrom(migrations, lastMigrationId, function(migrations) {
if(self.options.to)
filterTo(migrations, self.options.to, callback)
else
callback && callback(migrations)
}, { withoutEqual: true })
} else {
callback && callback(migrations)
}
})
}
}
Migrator.prototype.findOrCreateSequelizeMetaModel = function(syncOptions) {
var self = this
return new Utils.CustomEventEmitter(function(emitter) {
var SequelizeMeta = self.sequelize.modelManager.getModel('SequelizeMeta')
if(SequelizeMeta) {
emitter.emit('success', SequelizeMeta)
} else {
SequelizeMeta = self.sequelize.define('SequelizeMeta', {
lastMigrationId: DataTypes.STRING
})
SequelizeMeta
.sync(syncOptions || {})
.success(function() { emitter.emit('success', SequelizeMeta) })
.error(function(err) { emitter.emit('failure', err) })
}
}).run()
}
// private
var getLastMigrationIdFromDatabase = function() {
var self = this
return new Utils.CustomEventEmitter(function(emitter) {
self.findOrCreateSequelizeMetaModel().success(function(SequelizeMeta) {
SequelizeMeta.find({ order: 'id DESC' }).success(function(meta) {
emitter.emit('success', meta ? meta.lastMigrationId : null)
}).error(function(err) { emitter.emit('failure', err) })
}).error(function(err) { emitter.emit(err) })
}).run()
}
var getFormattedDateString = function(s) {
var result = null
try {
result = s.match(/(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/).slice(1, 6).join('-')
} catch(e) {
throw new Error(s + ' is no valid migration timestamp format! Use YYYYMMDDHHmmss!')
}
return result
}
var stringToDate = function(s) {
return moment(getFormattedDateString(s), "YYYYMMDDHHmmss")
}
return Migrator
})()