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dangerfile.ts
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dangerfile.ts
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import * as fs from 'fs'
import * as readline from 'readline'
import * as stream from 'stream'
import { danger, fail } from 'danger'
// verifyMigrationTransactions() checks that all migrations are wrapped in a transaction
const verifyMigrationTransactions = async () => {
const editedFiles = [
...danger.git.modified_files,
...danger.git.created_files,
]
const migrationFiles = editedFiles.filter(
(file) =>
file.includes('app-api/prisma/migrations') && file.match(/\.(sql)$/)
)
for (const file of migrationFiles) {
const firstLine = await readFirstLine(file)
const lastLine = await readLastLine(file)
if (firstLine !== 'BEGIN;' || lastLine !== 'COMMIT;') {
fail(`Migration ${file} is not wrapped in a transaction`)
}
}
}
async function readFirstLine(file: string) {
const fileStream = fs.createReadStream(file, { encoding: 'utf8' })
const reader = readline.createInterface({ input: fileStream })
const line = await new Promise((resolve) => {
reader.on('line', (line) => {
reader.close()
resolve(line)
})
})
fileStream.close()
return line
}
async function readLastLine(file: string, minLength: number = 1) {
let fileStream = fs.createReadStream(file, { encoding: 'utf8' })
let outStream = new stream.Writable()
let rl = readline.createInterface(fileStream, outStream)
let lastLine = ''
const line = await new Promise((resolve) => {
rl.on('line', (line) => {
if (line.length >= minLength) {
lastLine = line
}
})
rl.on('error', function (err) {
console.error(err)
})
rl.on('close', function () {
resolve(lastLine)
})
})
fileStream.close()
return line
}
verifyMigrationTransactions()