Microservices - Examples

Here are a few examples of microservice configurations.

API Gateway

eicrud.ms.ts

export const microServices: Record<string, MicroServiceConfig>  = {
    "entry": {
        services: [],
        openMsLink: false,
        openController: true,
        url: "http(s)://<entry_ms_host>",
    },
    "user": {
        services: [User],
        openMsLink: true,
        openController: false,
        url: "http(s)://<user_ms_host>",
    },
    "store": {
        services: [Store, Product],
        openMsLink: true,
        openController: false,
        url: "http(s)://<store_ms_host>",
    },
}

In this configuration Authentication, Authorization and Rate Limiting are performed on the entry ms.

Then requests are forwarded to the different ms depending on what service is called.

Note

user and store can communicate with each other via their ms-link, they won't listen to external requests since their controller is closed.

Auth Performance

eicrud.ms.ts

export const microServices: Record<string, MicroServiceConfig>  = {
    "entry": {
        services: [User],
        openMsLink: true,
        openController: true,
        url: "http(s)://<entry_ms_host>",
    },
    "store": {
        services: [Store],
        openMsLink: true,
        openController: false,
        url: "http(s)://<store_ms_host>",
    },
    "product": {
        services: [Product],
        openMsLink: true,
        openController: false,
        url: "http(s)://<product_ms_host>",
    },
}

This configuration puts the UserService into the entry ms. Along with caching users in RAM, this allows for great performance since the users will be fetched from the pod memory.

It can work with multiple entry pods if you put a load balancer with an IP-hashing strategy in front of it.

Note

This configuration leaves your ms-link exposed to the internet, you might want to use a reverse proxy that blocks requests to /crud/ms-link/* coming from outside your network.

Maximum Distribution

eicrud.ms.ts

export const microServices: Record<string, MicroServiceConfig>  = {
    "entry": {
        services: [],
        openMsLink: false,
        openController: true,
        url: "http(s)://<entry_ms_host>",
        proxyCrudController: true,
    },
    "store": {
        services: [Store],
        openMsLink: true,
        openController: true,
        url: "http(s)://<store_ms_host>",
    },
    "product": {
        services: [Product],
        openMsLink: true,
        openController: true,
        url: "http(s)://<product_ms_host>",
    },    
    "user": {
        services: [User],
        openMsLink: true,
        openController: true,
        url: "http(s)://<user_ms_host>",
    },
}

In this configuration, the entry acts as a simple proxy, requests are forwarded to the microservices' controllers.

Note

In this configuration, no checking is performed on the entry. Each ms performs its own validation, authentication, authorization and limiting.