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1 | 'use strict' | |
2 | ||
3 | const eachSeries = require('async/eachSeries') | |
4 | const fs = require('fs') | |
5 | const path = require('path') | |
6 | ||
7 | const constants = require('./constants') | |
8 | const db = require('./database') | |
9 | const logger = require('../helpers/logger') | |
10 | ||
11 | const migrator = { | |
12 | migrate: migrate | |
13 | } | |
14 | ||
15 | function migrate (callback) { | |
16 | db.Application.loadMigrationVersion(function (err, actualVersion) { | |
17 | if (err) return callback(err) | |
18 | ||
19 | // If there are a new migration scripts | |
20 | if (actualVersion < constants.LAST_MIGRATION_VERSION) { | |
21 | logger.info('Begin migrations.') | |
22 | ||
23 | getMigrationScripts(function (err, migrationScripts) { | |
24 | if (err) return callback(err) | |
25 | ||
26 | eachSeries(migrationScripts, function (entity, callbackEach) { | |
27 | executeMigration(actualVersion, entity, callbackEach) | |
28 | }, function (err) { | |
29 | if (err) return callback(err) | |
30 | ||
31 | logger.info('Migrations finished. New migration version schema: %s', constants.LAST_MIGRATION_VERSION) | |
32 | return callback(null) | |
33 | }) | |
34 | }) | |
35 | } else { | |
36 | return callback(null) | |
37 | } | |
38 | }) | |
39 | } | |
40 | ||
41 | // --------------------------------------------------------------------------- | |
42 | ||
43 | module.exports = migrator | |
44 | ||
45 | // --------------------------------------------------------------------------- | |
46 | ||
47 | function getMigrationScripts (callback) { | |
48 | fs.readdir(path.join(__dirname, 'migrations'), function (err, files) { | |
49 | if (err) return callback(err) | |
50 | ||
51 | const filesToMigrate = [] | |
52 | ||
53 | files.forEach(function (file) { | |
54 | // Filename is something like 'version-blabla.js' | |
55 | const version = file.split('-')[0] | |
56 | filesToMigrate.push({ | |
57 | version, | |
58 | script: file | |
59 | }) | |
60 | }) | |
61 | ||
62 | return callback(err, filesToMigrate) | |
63 | }) | |
64 | } | |
65 | ||
66 | function executeMigration (actualVersion, entity, callback) { | |
67 | const versionScript = parseInt(entity.version) | |
68 | ||
69 | // Do not execute old migration scripts | |
70 | if (versionScript <= actualVersion) return callback(null) | |
71 | ||
72 | // Load the migration module and run it | |
73 | const migrationScriptName = entity.script | |
74 | logger.info('Executing %s migration script.', migrationScriptName) | |
75 | ||
76 | const migrationScript = require(path.join(__dirname, 'migrations', migrationScriptName)) | |
77 | ||
78 | db.sequelize.transaction().asCallback(function (err, t) { | |
79 | if (err) return callback(err) | |
80 | ||
81 | const options = { | |
82 | transaction: t, | |
83 | queryInterface: db.sequelize.getQueryInterface(), | |
84 | Sequelize: db.Sequelize | |
85 | } | |
86 | migrationScript.up(options, function (err) { | |
87 | if (err) { | |
88 | t.rollback() | |
89 | return callback(err) | |
90 | } | |
91 | ||
92 | // Update the new migration version | |
93 | db.Application.updateMigrationVersion(versionScript, t, function (err) { | |
94 | if (err) { | |
95 | t.rollback() | |
96 | return callback(err) | |
97 | } | |
98 | ||
99 | t.commit().asCallback(callback) | |
100 | }) | |
101 | }) | |
102 | }) | |
103 | } |