Minesweeper

Plan:

• Minesweeper game actions
• Minesweeper game flag field as mine
• Minesweeper game deflag a field
• Generate game
• start new game
• make an action to a given game
• Win a game
• cannot perform any action when game is lost or won
• run DB on k8s locally?
• run locally on k8s with one node
• run another service communicating with previous one
• ES - compare and set with events based on versions

Later or never:

• Generate game based on levels

Before running:

Working with gradle and make with multimodule:

Stupid but works. In each module create a symlink to gradlew file:

1. Enter module dir
2. ln -s $(PWD)/../gradlew gradlew

Thanks to this you can both have single source of truth of how to build a module solo, but at the same time have a "delegate-build-all" main Makefile.

Running:

• test: ./gradlew clean test
• test in docker: ./script/test-ci
• run locally:
  • in Intellij -> first run make local-development
  • in docker -> make build-and-run
• deploy to k8s locally:
  • make deploy-local

Other notes for me

Creating MongoDB:

• helm repo add stable https://kubernetes-charts.storage.googleapis.com/

• helm install minesweeper-mongo stable/mongodb-replicaset

• verification:

1. After the statefulset is created completely, one can check which instance is primary by running:

    $ for ((i = 0; i < 3; ++i)); do kubectl exec --namespace default minesweeper-mongo-mongodb-replicaset-$i -- sh -c 'mongo --eval="printjson(rs.isMaster())"'; done

2. One can insert a key into the primary instance of the mongodb replica set by running the following:
    MASTER_POD_NAME must be replaced with the name of the master found from the previous step.

    $ kubectl exec --namespace default MASTER_POD_NAME -- mongo --eval="printjson(db.test.insert({key1: 'value1'}))"

3. One can fetch the keys stored in the primary or any of the slave nodes in the following manner.
    POD_NAME must be replaced by the name of the pod being queried.

    $ kubectl exec --namespace default POD_NAME -- mongo --eval="rs.slaveOk(); db.test.find().forEach(printjson)"