DAPR C# DEMO

This is a sample project using Dapr with dotnet core 5.0 and redis cache as a store. We have a sample api controller with several actions:

• create client
• get client
• delete client

Check src/DaprSamples/SampleStateStore_Redis for a sample project.

TOOLS

• Minikube
• Docker
• Kubernetes (kubectl)
• dotnet core 5.0
• Dapr

INSTALL DAPR ON KUBERNETES

I am going to use minukube to run Kubernetes locally.

1. Start minikube

minikube start

2. Install DAPR locally on your kubernetes cluster

dapr init -k

3. Install Redis into your cluster

dapr init -k

and check the status

kubectl get pods

, and you should see 3 nodes in RUNNING status.

To get the redis password, use

export REDIS_PASSWORD=$(kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" | base64 --decode)

4. Run DAPR API project locally

cd src/DaprSamples/SampleStateStore_Redis
dotnet build
dapr run --app-id controller --app-port 5000 -- dotnet run

, where app-id defines the name of the app for Dapr.

5. Add DAPR components to the Kubernetes cluster

5.1. Create redis-statestore.yaml

and add

apiVersion: v1
kind: Secret
metadata:
  name: redis
data:
  redis-password: <REPLACE WITH BASE64 ENCODED PASSWORD>
---
apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: statestore
  namespace: default
spec:
  type: state.redis
  version: v1
  metadata:
  - name: redisHost
    value: localhost:6379
  - name: redisPassword
    secretKeyRef:
      name: redis
      key: redis-password

Or check redis-statestore.yaml

Here we create a state store component for persistence and restoration, using redis cache.

5.2. Deploy to the Kubernetes cluster

deploy -f redis-pubsub.yaml apply

6. Mappings

• redis-pubsub.yaml --> kind: Component (1st) --> name: statestore equals SampleController.cs --> public const string StoreName = "statestore";
• redis-pubsub.yaml --> kind: Component (2nd) --> name: pubsub equals SampleController.cs --> [Topic("pubsub", ...)]

7. Add client to the store

POST http://localhost:5000/addClient
Content-Type: application/json

{
    "Id": "1",
    "FirstName" : "Evgeny",
    "LastName" : "Grishchenko"
}

To verify the redis (the store ):

redis-cli -h localhost -a <YOUR REDIS PASSWORD>
KEYS *
HGET <OUR KEY NAME>

Yes, the value is stored as HASH type. In this case the name of the key would be controller||<client id>

8. Get client from the store

GET http://localhost:5000/getClient/1
Content-Type: application/json

{
    "id": "1",
    "firstName": "Evgeny",
    "lastName": "Grishchenko"
}

9. Delete client from the store

DELETE http://localhost:5000/deleteClient/1

Who do I talk to?

• Evgeny Grishchenko e.grisss@gmail.com