Persistent Storage feature

[cyril36]

Description

I have created new parameters to be able to store the data in a json file instead of being only in memory data With this new parameters we can :

• save the in memory data in the json file given in input
• create a copy of this json file at every action, this way we keep an history of the mutation and if we want to revert a change and come back to a previous version, we can replace the input file with the backup
• provide a directory where those copies will be saved
• add some logs

The parameters to use are:

• --persistent : enable the persistent feature that will save the in memory data in the json file
• --keep-change-history : enable a feature that will create a copy of the json file everytime there is an action
• --persistent-dir (string) : path where the data copy will be saved
• --verbose : to have some logs

Related Issue

I had the same need as the user in this ticket

https://github.com/marmelab/json-graphql-server/issues/96

I dont know if you will want to include it to your repo, but it might help other people :D

Best regards,