Front-Proxy PoC
Simple Envoy Service Mesh with External Authorization and Custom Header Injection.
Showing that Envoy can be used in conjunction with external auth (ext-authz) to
manage routing, headers, and auth. The two backend services service/sn-instagram/instagram.go
and service/sn-facebook/facebook.go are placeholders to help demonstrate separation of services
and routing.
The Call Flow
- Envoy is listening on port 8000
- Checks with extauth (port 4000)
- extauth injects token if valid and removes original auth header
- Endpoint is then hit
extauth is called via gRPC because of how Envoy has decided to implement External Authorization.
How to set it up
1. Cloning the repository
Make sure you've cloned this repo under your working GOPATH, this is important!
For example: ~/go/src/simple-envoy-service-mesh.
2. Setup Docker-compose Run Config
Next, we want to edit our Run/Debug Configurations. Click on Add Configuration.
Then we want to add a new configuration of Docker Compose under + > Docker > Docker-compose. These run configs
allow us to start the container quickly through IntelliJ.
Fill in the details as follows. Select the docker-compose.yaml file for the field Compose File(s). No
need to worry about requirements as the Dockerfiles take care of that on first run.
Done! Now you can run the service.
3.1. Running the service
To run the entire service, we can just let IntelliJ handle it for us and
run it through the Run Config we created earlier. Select envoy-example from the dropdown menu and press Run!
You can then test the service with a curl command.
This, as an example, would hit the Instagram service and get the post for that member ID
curl -X GET \
http://localhost:8000/instagram/get_post/1 \
-H 'Authorization: Bearer 1'It should return a response like this
Hello from the Instagram service! Fetching post with ID "1"
Finding test header value: "some test token"
Similarly, Facebook can be hit by changing the service name.
curl -X GET \
http://localhost:8000/facebook/get_post/1 \
-H 'Authorization: Bearer 1'Hello from the Facebook service! Fetching post with ID "1"
Finding test header value: "some test token"