dapr-spike's Introduction

dapr-spike

Spike code exploring a simple use case with dapr (distributed application runtime)

dapr concepts

dapr install

wget -q https://raw.githubusercontent.com/dapr/cli/master/install/install.sh -O - | /bin/bash

init

This will pull the required dapr binaries via Docker images and run as a container

dapr init

Verify install with

dapr -v

Verify components directory initialized with

ls $HOME/.dapr
bin  components  config.yaml # expected output

service invocation

server

run dapr sidecar on server

dapr run --app-id hello-world-server --app-port 3001 --dapr-http-port 3500 npm run start:server
or
npm run dapr:server

invoke server endpoint via dapr sidecar

curl http://localhost:3500/v1.0/invoke/hello-world-server/method/api/v1/message
{"message":"Hello World!"}

client

run dapr sidecar on client

dapr run --app-id hello-world-client --app-port 3002 --dapr-http-port 3501 npm run start:client
or
npm run dapr:client

invoke client endpoint via dapr sidecar

curl http://localhost:3501/v1.0/invoke/hello-world-client/method/fetch-message
{"message":"Hello World!","originAppId":"hello-world-server"}

state management

Create a new user:

curl --location 'localhost:3500/v1.0/invoke/hello-world-server/method/api/v1/user' \
--header 'Content-Type: application/json' \
--data '{
    "name": "Alan"
} '
9cdc5d54-5d74-4037-887c-2ea4e31b2271

Query for user:

curl --location 'http://localhost:3500/v1.0/invoke/hello-world-server/method/api/v1/user/9cdc5d54-5d74-4037-887c-2ea4e31b2271' 
{
    "id": "9cdc5d54-5d74-4037-887c-2ea4e31b2271",
    "name": "Alan"
}