## A Multi-Feature Environment Example

English | [简体中文](./README-zh.md)

## I. Deployment Structure

<img src="./imgs/structs.png" alt="multi-feature environment structure"/>

As shown in the figure above, there are three environments.

1. `baseline` environment, including `FrontService`, `MiddleService`, `BackendService`
2. `feature1` environment, including `MiddleService`, `BackendService`
3. `feature2` environment, including `FrontService`, `BackendService`

And at the entrance, deploy the `gateway` service.

Three request links.

1. `baseline` environment link, `Gateway` -> `FrontService`(baseline) -> `MiddleService`(baseline) -> `BackendService`(
   baseline)
2. `feature1` environment link, `Gateway` -> `FrontService`(baseline) -> `MiddleService`(feature1) -> `BackendService`(
   feature1)
3. `feature2` environment link, `Gateway` -> `FrontService`(feature2) -> `MiddleService`(baseline) -> `BackendService`(
   feature2)

## II. Running

Without any code changes, just start all the applications under `base`, `feature1`, `feature2`, `featureenv-gateway`
directly.

By default, the applications point to the official Polaris experience environment, and you can directly view the service
registration data at the experience site after a successful launch.

- Console address: http://119.91.66.223:80/
    - Account: polaris
    - Password: polaris

## III. Testing

### Mode 1: Client Request With `featureenv` Label

#### `baseline` environment link

````
curl http://127.0.0.1:9999/featureenv-front-example/router/rest
````

Response results (base indicates baseline environment)

````
featureenv-front-example[base] -> featureenv-middle-example[base] -> featureenv-backend-example[base]
````

#### `feature1` environment link

Specify the feature environment via the `X-Polaris-Metadata-Transitive-featureenv` request header.

````
curl -H'X-Polaris-Metadata-Transitive-featureenv:feature1' http://127.0.0.1:9999/featureenv-front-example/router/rest
````

Response results

````
featureenv-front-example[base] -> featureenv-middle-example[feature1] -> featureenv-backend-example[feature1]
````

#### `feature2` environment link

Specify the feature environment via the `X-Polaris-Metadata-Transitive-featureenv` request header.

````
curl -H'X-Polaris-Metadata-Transitive-featureenv:feature2' http://127.0.0.1:9999/featureenv-front-example/router/rest
````

Response results

````
featureenv-front-example[feature2] -> featureenv-middle-example[base] -> featureenv-backend-example[feature2]
````

### Mode 2: Gateway traffic staining

Simulate a real-world scenario, assuming that the client request has a uid request parameter and expects:

1. `uid=1000` requests hit the `feature1` environment
2. `uid=2000` requests hit the `feature2` environment
3. requests with other uid hit the `baseline` environment

**Configure coloring rules**

Polaris Configuration Address: http://119.91.66.223:80/#/filegroup-detail?group=featureenv-gateway&namespace=default

Modify the `rule/staining.json` configuration file and fill in the following rule:

````json
{
  "rules": [
    {
      "conditions": [
        {
          "key": "${http.query.uid}",
          "values": [
            "1000"
          ],
          "operation": "EQUALS"
        }
      ],
      "labels": [
        {
          "key": "featureenv",
          "value": "feature1"
        }
      ]
    },
    {
      "conditions": [
        {
          "key": "${http.query.uid}",
          "values": [
            "2000"
          ],
          "operation": "EQUALS"
        }
      ],
      "labels": [
        {
          "key": "featureenv",
          "value": "feature2"
        }
      ]
    }
  ]
}
````

Just fill out and publish the configuration.

#### `baseline` Environment Link

````
curl http://127.0.0.1:9999/featureenv-front-example/router/rest?uid=3000
````

Response results (base indicates baseline environment)

````
featureenv-front-example[base] -> featureenv-middle-example[base] -> featureenv-backend-example[base]
````

#### `feature1` Environment Link

Specify the feature environment via the `X-Polaris-Metadata-Transitive-featureenv` request header.

````
curl http://127.0.0.1:9999/featureenv-front-example/router/rest?uid=1000
````

Response results

````
featureenv-front-example[base] -> featureenv-middle-example[feature1] -> featureenv-backend-example[feature1]
````

#### `feature2` Environment Link

Specify the feature environment via the `X-Polaris-Metadata-Transitive-featureenv` request header.

````
curl http://127.0.0.1:9999/featureenv-front-example/router/rest?uid=2000
````

Response results

````
featureenv-front-example[feature2] -> featureenv-middle-example[base] -> featureenv-backend-example[feature2]
````