Archivarius

Note

This version is published for demo and testing purpose. Wait for the version 1.x before using in production

Fast and reliable file based database for microservices good enough to handle 100+ mln records per collection

Highlights

• synchronous — yep, to much chaos in this world and sometimes we need to get back in sync
• reliable — you can hard switch off server and this will be fine handled
• dependency free
• in memory with synchronous persisting to the disk
• high performance
• transactional
• simple as possible

import { Archivarius } from 'archivarius'

const collections = {
    users: {
        onPost: (database, record) => {
            record.createdAt = Date.now()
            return (database, record) => {
                if (record.couponName) {
                    const coupons = database.search('coupons', { name: record.couponName })
                    if (coupons[0].count === coupons[0].countUsed) {
                        throw new Error(`coupon ${record.couponName} is exceed its limit`)
                    }
                    coupons[0].countUsed++
                    database.put('coupons', coupons[0])
                }
            }
        },
    },
    coupons: {
        onPost(database, record) {
            record.countUsed = 0
        },
    },
}
const storageDir = `${__dirname}/../archivarius`

const db = new Archivarius(collections, storageDir)

const userNew = { 
  username: 'john', 
  password: '555555'
}

// every data changing operation should be wrapped in transaction
// option 1 - callback
// this option fill 
db.transactionsStart(() => {
  const user = db.post('users', userNew)
  return () => {
    console.log('you will see me after transaction is committed')
  }
})

// option 2 - direct use, please carefully catch exceptions you will have to rollback transactions manually 
const query = { username: 'john' }
const users = db.search('users', query)

db.transactionsStart()
try {
  users[0].email = '[email protected]'
  db.put('users', users[0])
} catch (e) {
  console.error(e)
  db.transactionsRollback()
}
db.transactionsCommit()

const query = { username: 'john' }
const users = db.search('users', query)

db.delete('users', users[0]._)

Best Practice

Road Map

• Indexes
• Hooks
• Full test coverage

Changelog

0.1.13

• now storage dir will be created if not exists instead of exception

0.1.12

• fix: delete method now return {_}

0.1.0

• transactions hooks

0.0.9

• documentation updates
• bug fixes
• tests
• development tools improvements

0.0.8

• readme updates and some refactoring