Backup Restore Machine

machine.js

const canBackup = (context, event) => {
  return !context.backupLock
};

const canRestore = (context, event) => {
  return !context.restoreLock
};

const backupMachine = Machine(
  {
    id: 'backup',
    context: {
      backupLock: false,
      restoreLock: false
    },
    initial: 'start',
    states: {
      start: {
        on: {
          GET_RESTORE: {
            target: 'queryS3',
            cond: 'canRestore'
          },
          GET_BACKUP: {
            target: 'backingUp',
            cond: 'canBackup'
          }
        }
      },
      backingUp: {
        on: {
          BACKUP_FINISH: 'start'
        },
        entry: assign({
          backupLock: (context, event) => true
        }),
        exit: assign({
          backupLock: (context, event) => false
        })
      },
      queryS3: {
        on: {
          NO_BACKUP: 'start',
          EXISTS_BACKUP: 'restoring'
        }
      },
      restoring: {
        on: {
          RESTORE_FINISH: 'start'
        },
        entry: assign({
          restoreLock: (context, event) => true
        }),
        exit: assign({
          restoreLock: (context, event) => false
        })
      }
    }
  },
  {
    guards: {
      canBackup,
      canRestore
    }
  }
);