Easily work with Consul Key/Value Store
Links
https://developer.hashicorp.com/consul/docs/dynamic-app-config/kv - Key/Value (KV) Store
https://www.npmjs.com/package/ilink-console-tools - console. utility for upload/download env files to/from consul-kv
https://www.npmjs.com/package/nestjs-consul-kv-realtime - NestJS module for realtime work with Consul-KV
https://github.com/EndyKaufman/nestjs-consul-example - project with code from this post
Steps to create a project using nest and consul
1. Create NestJS project
a) Create a new NestJS application with @nestjs/cli
npm i -g @nestjs/cli
nest new nestjs-consul-example
cd nestjs-consul-example
b) Install dependencies
npm i --save consul nestjs-consul-kv-realtime
c) Install devDependencies
npm i --save-dev ilink-console-tools @types/consul
2. Add work with Docker-compose
a) Install docker-compose
https://docs.docker.com/compose/install
b) Create nestjs-consul-example/docker-compose.yml
version: "3"
networks:
nestjs-consul-example-network:
driver: bridge
services:
nestjs-consul-example:
image: bitnami/consul:latest
container_name: "nestjs-consul-example"
environment:
- CONSUL_HTTP_TOKEN=${CONSUL_TOKEN_MASTER}
networks:
- nestjs-consul-example-network
ports:
- "8300:8300"
- "8301:8301"
- "8301:8301/udp"
- "8500:8500"
- "8600:8600"
- "8600:8600/udp"
c) Create nestjs-consul-example/env.docker-compose
CONSUL_HTTP_TOKEN=e2999fc6-1fc1-4345-a56e-e9d27b34c1c1
d) Add new scripts to nestjs-consul-example/package.json
{
"scripts": {
"__________dev infra__________": "__________dev infra__________",
"docker:dev:restart": "npm run docker:dev:down && npm run docker:dev:up",
"docker:dev:up": "set -a && . ./env.docker-compose && set +a && export COMPOSE_INTERACTIVE_NO_CLI=1 && docker-compose -f ./docker-compose.yml --compatibility up -d",
"docker:dev:down": "set -a && . ./env.docker-compose && set +a && export COMPOSE_INTERACTIVE_NO_CLI=1 && docker-compose -f ./docker-compose.yml down"
}
}
e) Start docker-compose
npm run docker:dev:restart
3. Add default environment variables to consul
a) Create nestjs-consul-example/env.default
HELLO_MESSAGE="Hello from ENV file!"
b) Add new script and update exist in nestjs-consul-example/package.json
{
"scripts": {
"__________dev infra__________": "__________dev infra__________",
"docker:dev:restart": "npm run docker:dev:down && npm run docker:dev:up && npm run docker:dev:fill-default-data",
"docker:dev:up": "set -a && . ./env.docker-compose && set +a && export COMPOSE_INTERACTIVE_NO_CLI=1 && docker-compose -f ./docker-compose.yml --compatibility up -d",
"docker:dev:down": "set -a && . ./env.docker-compose && set +a && export COMPOSE_INTERACTIVE_NO_CLI=1 && docker-compose -f ./docker-compose.yml down",
"docker:dev:fill-default-data": "set -a && . ./env.docker-compose && set +a && ilink-console-tools env-to-consul --path=./env.default --consul-token=$CONSUL_HTTP_TOKEN --consul-clear=true"
}
}
c) Restart docker-compose
npm run docker:dev:restart
d) Navigate to http://localhost:8500/ui/dc1/kv/env/ and check data in UI
4. Add NestjsConsulKvRealtimeModule to the application
a) Update nestjs-consul-example/src/app.module.ts
import { Module } from '@nestjs/common';
import { NestjsConsulKvRealtimeModule } from 'nestjs-consul-kv-realtime';
import { AppController } from './app.controller';
import { AppService } from './app.service';
@Module({
imports: [
NestjsConsulKvRealtimeModule.forRootAsync({
useFactory: async () => ({
port: '8500',
host: 'localhost',
defaults: {
token: process.env.CONSUL_HTTP_TOKEN,
},
}),
}),
],
controllers: [AppController],
providers: [AppService],
})
export class AppModule {}
b) Update nestjs-consul-example/src/app.controller.ts
import { Controller, Get } from '@nestjs/common';
import { ConsulKeyValue } from 'nestjs-consul-kv-realtime';
import { AppService } from './app.service';
@Controller()
export class AppController {
@ConsulKeyValue({
key: 'env',
})
consulEnvironments!: { HELLO_MESSAGE: string };
constructor(private readonly appService: AppService) {}
@Get()
getHello(): string {
return this.appService.getHello();
}
@Get('consul')
getConsulHello(): string {
return this.consulEnvironments.HELLO_MESSAGE;
}
}
c) Update nestjs-consul-example/tsconfig.json
{
"compilerOptions": {
"module": "commonjs",
"declaration": true,
"removeComments": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"allowSyntheticDefaultImports": true,
"target": "es2017",
"sourceMap": true,
"outDir": "./dist",
"baseUrl": "./",
"incremental": true,
"skipLibCheck": true,
"strictNullChecks": false,
"noImplicitAny": false,
"strictBindCallApply": false,
"forceConsistentCasingInFileNames": false,
"noFallthroughCasesInSwitch": false,
"esModuleInterop": true
}
}
d) Add new scripts to nestjs-consul-example/package.json
{
"scripts": {
"start:dev": "set -a && . ./env.docker-compose && set +a && nest start --watch",
"test": "npm run docker:dev:fill-default-data && set -a && . ./env.docker-compose && set +a && jest --forceExit",
}
}
5. Update tests and test them
a) Update exist test nestjs-consul-example/src/app.controller.spec.ts
import { Test, TestingModule } from '@nestjs/testing';
import Consul from 'consul';
import { NestjsConsulKvRealtimeModule } from 'nestjs-consul-kv-realtime';
import { AppController } from './app.controller';
import { AppService } from './app.service';
describe('AppController', () => {
let appController: AppController;
beforeEach(async () => {
const app: TestingModule = await Test.createTestingModule({
imports: [
NestjsConsulKvRealtimeModule.forRootAsync({
useFactory: async () => ({
port: '8500',
host: 'localhost',
defaults: {
token: process.env.CONSUL_HTTP_TOKEN,
},
}),
}),
],
controllers: [AppController],
providers: [AppService],
}).compile();
await app.init();
appController = app.get<AppController>(AppController);
});
describe('root', () => {
it('should return "Hello World!"', () => {
expect(appController.getHello()).toBe('Hello World!');
});
it('should return "Hello from ENV file!"', async () => {
expect(appController.getConsulHello()).toBe('Hello from ENV file!');
});
it('should return "Hello from TEST!"', async () => {
const consul = new Consul({
port: '8500',
host: 'localhost',
defaults: {
token: process.env.CONSUL_HTTP_TOKEN,
},
});
await consul.kv.set('env/HELLO_MESSAGE', 'Hello from TEST!');
expect(appController.getConsulHello()).not.toBe('Hello from TEST!');
await new Promise((resolve) => setTimeout(resolve, 1500));
expect(appController.getConsulHello()).toBe('Hello from TEST!');
});
});
});
b) Run tests
npm run test
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