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migrator - cleaner migration runner with es7

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This commit is contained in:
kumavis 2017-05-11 18:15:59 -07:00
parent 8421cf9cce
commit 70a328e028
1 changed files with 12 additions and 24 deletions
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36
app/scripts/lib/migrator/index.js
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@ -1,47 +1,35 @@
const asyncQ = require('async-q')
class Migrator {
constructor (opts = {}) {
const migrations = opts.migrations || []
// sort migrations by version
this.migrations = migrations.sort((a, b) => a.version - b.version)
// grab migration with highest version
const lastMigration = this.migrations.slice(-1)[0]
// use specified defaultVersion or highest migration version
this.defaultVersion = opts.defaultVersion || (lastMigration && lastMigration.version) || 0
}
// run all pending migrations on meta in place
migrateData (versionedData = this.generateInitialState()) {
const remaining = this.migrations.filter(migrationIsPending)
if (remaining.length === 0) return versionedData
async migrateData (versionedData = this.generateInitialState()) {
const pendingMigrations = this.migrations.filter(migrationIsPending)
const migrations = remaining.map((migration, i) => {
if (i === 0) return this.runMigration.bind(this, migration, versionedData)
return this.runMigration.bind(this, migration)
})
for (let index in pendingMigrations) {
let migration = pendingMigrations[index]
versionedData = await migration.migrate(versionedData)
if (!versionedData.data) throw new Error('Migrator - migration returned empty data')
if (versionedData.version !== undefined && migratedData.meta.version !== migration.version) throw new Error('Migrator - Migration did not update version number correctly')
}
return (
asyncQ.waterfall(migrations)
.then((migratedData) => Promise.resolve(migratedData))
)
return versionedData
// migration is "pending" if hit has a higher
// migration is "pending" if it has a higher
// version number than currentVersion
function migrationIsPending (migration) {
return migration.version > versionedData.meta.version
}
}
runMigration (migration, versionedData) {
return migration.migrate(versionedData)
.then((migratedData) => {
if (!migratedData.data) return Promise.reject(new Error('Migrator - migration returned empty data'))
if (migration.version !== undefined && migratedData.meta.version !== migration.version) return Promise.reject(new Error('Migrator - Migration did not update version number correctly'))
return Promise.resolve(migratedData)
})
}
generateInitialState (initState) {
return {
meta: {