gRPC in 3 minutes (C#)

BACKGROUND

This is a version of the helloworld example using the dotnet SDK tools to compile helloworld.proto in a common library, build the server and the client, and run them.

PREREQUISITES

• The .NET Core SDK 2.1+

You can also build the solution Greeter.sln using Visual Studio 2017, but it's not a requirement.

BUILD AND RUN

• Build and run the server

  > dotnet run -p GreeterServer
  

• Build and run the client

  > dotnet run -p GreeterClient
  

Tutorial

You can find a more detailed tutorial about gRPC in gRPC Basics: C#

Earthquake monitoring

This app simulates an earthquake response using a microservice architecture.

It consists of a backend app (see folder eartqake-monitoring) written using the moleculer framework and admin panel (see folder client-app) written in angular.

For the communication between services mqtt broker is used (only when deployed to docker).

Moleculer

Usage

Start the project in dev mode with npm run dev command. After starting, open the http://localhost:3000/ URL in your browser. On the welcome page you can test the generated services via API Gateway and check the nodes & services.

Services

• api: API Gateway services and also used for hosting a socket server.
• data: Service that saves data to DB and publishes data to analytics-data topic.
• device: Service that randomly publishes data to new-data topic, simulates sensor work. Also has routes for setting the interval of sampling.
• command: Service used to host all the commands for the actuators and start the when an alert happens.
• analytics: Service saves important data to DB and publishes them out if needed.

NPM scripts

• npm run dev: Start development mode (load all services locally with hot-reload & REPL)

To use the commands below first you need to install docker on your machine

• npm run dc:up: Start the stack with Docker Compose and also starts the angular client
• npm run dc:down: Stop the stack with Docker Compose

Routes

• GET /api/analytics/
• GET /api/analytics/:id
• POST /api/analytics/
• PUT /api/analytics/:id
• DELETE /api/analytics/:id
• GET /api/command/
• GET /api/data/
• GET /api/data/:id
• POST /api/data/
• PUT /api/data/:id
• DELETE /api/data/:id
• GET /api/device/settings
• POST /api/device/settings

Angular

Usage

Start the moleculer backend first

Start the project in dev mode with npm start command. After starting, open the http://localhost:4200/ URL in your browser.