1 | 'use strict'
|
2 |
|
3 | process.on('unhandledRejection', function(reason, promise){
|
4 | console.log({ event: 'UnhandledPromiseRejection', promise, reason })
|
5 | process.exit(1)
|
6 | })
|
7 |
|
8 | const uuid = require('uuid/v4')
|
9 | const analyser = require('./analyser')
|
10 | const ConflictError = require('./errors/conflict')
|
11 | const localRepository = require('./repositories/local')
|
12 | const MigrationUpError = require('./errors/migration-up')
|
13 | const remoteRepository = require('./repositories/remote')
|
14 | const MigrationDownError = require('./errors/migration-down')
|
15 |
|
16 | const conflictValidation = async (analysed) => {
|
17 | const conflicts = await analysed.conflicting()
|
18 | if (conflicts.length > 0) {
|
19 |
|
20 | throw new ConflictError(conflicts)
|
21 | }
|
22 | }
|
23 |
|
24 | const migrateDown = async (migrationRegistry, local, args) => {
|
25 | const migrationFiles = await local.fetchAll(migrationRegistry.content)
|
26 | const downedMigrations = []
|
27 |
|
28 | try {
|
29 | for (const migration of migrationFiles) {
|
30 | await migration.content.down(...args)
|
31 | downedMigrations.push(migration.name)
|
32 | }
|
33 | } catch (err) {
|
34 | throw new MigrationDownError(err, migrationRegistry, downedMigrations)
|
35 | }
|
36 | }
|
37 |
|
38 | const migrateUp = async (migrationFiles, args) => {
|
39 | const migrationRegistry = { name: uuid(), content: [] }
|
40 |
|
41 | try {
|
42 | for (const migration of migrationFiles) {
|
43 | await migration.content.up(...args)
|
44 | migrationRegistry.content.push(migration.name)
|
45 | }
|
46 | } catch (err) {
|
47 | throw new MigrationUpError(err, migrationRegistry)
|
48 | }
|
49 |
|
50 | return migrationRegistry
|
51 | }
|
52 |
|
53 | const unsynced = async (analysed, local) => {
|
54 | const unsynced = await analysed.unsynced()
|
55 | return local.fetchAll(unsynced.map(migration => migration.name))
|
56 | }
|
57 |
|
58 | module.exports = (local, remote) => ({
|
59 | up: async (...args) => {
|
60 | const analysed = await analyser(local, remote).analyse()
|
61 |
|
62 | await conflictValidation(analysed)
|
63 |
|
64 | const migrations = await unsynced(analysed, local)
|
65 | const migrationRegistry = await migrateUp(migrations, args)
|
66 |
|
67 | if (migrationRegistry.content.length === 0) {
|
68 | return migrationRegistry
|
69 | }
|
70 |
|
71 | return remote.add(migrationRegistry.name, migrationRegistry.content)
|
72 | .then(() => migrationRegistry)
|
73 | },
|
74 | down: async (...args) => {
|
75 | await analyser(local, remote).analyse()
|
76 | .then(conflictValidation)
|
77 |
|
78 | const latestMigration = await remote.all()
|
79 | .then(all => all.reverse().shift())
|
80 |
|
81 | if (!latestMigration) {
|
82 | return null
|
83 | }
|
84 |
|
85 | await migrateDown(latestMigration, local, args)
|
86 | await remote.remove(latestMigration.name)
|
87 |
|
88 | return latestMigration
|
89 | }
|
90 | })
|
91 |
|
92 | module.exports.from = (localAdaptor, remoteAdaptor) => {
|
93 | return module.exports(
|
94 | localRepository(localAdaptor),
|
95 | remoteRepository(remoteAdaptor),
|
96 | )
|
97 | }
|