nest-consul-config

Description

A component of nestcloud. NestCloud is a nest framework micro-service solution.

中文文档

This is a Nest module to get configurations from consul kv.

Installation

$ npm i --save nest-consul consul nest-consul-config

Quick Start

Import Module

import { Module } from '@nestjs/common';
import { ConsulModule } from 'nest-consul';
import { ConsulConfigModule } from 'nest-consul-config';
 
const env = process.env.NODE_ENV;
 
@Module({
  imports: [
      ConsulModule.register({
        host: '127.0.0.1',
        port: 8500
      }),
      ConsulConfigModule.register({key: `config__user-service__${env}`})
  ],
})
export class ApplicationModule {}

If you use nest-boot module.

import { Module } from '@nestjs/common';
import { ConsulModule } from 'nest-consul';
import { ConsulConfigModule } from 'nest-consul-config';
import { BootModule } from 'nest-boot';
import { NEST_BOOT } from 'nest-common';
 
@Module({
  imports: [
      ConsulModule.register({dependencies: [NEST_BOOT]}),
      BootModule.register(__dirname, 'bootstrap.yml'),
      ConsulConfigModule.register({dependencies: [NEST_BOOT]})
  ],
})
export class ApplicationModule {}

Nest-boot config file

web:
  serviceId:
  serviceName: user-service
consul:
  host: localhost
  port: 8500
  config:
    # available expressions: {serviceName} {serviceId} {env} 
    key: config__{serviceName}__{env}
    retry: 5

Config Client Injection

In consul kv, the key is "config__user-service__development".

user:
  info:
    name: 'test'

import { Injectable } from '@nestjs/common';
import { InjectConfig, ConsulConfig } from 'nest-consul-config';
 
@Injectable()
export class TestService {
  constructor(
      @InjectConfig() private readonly config: ConsulConfig
  ) {}
 
  getUserInfo() {
      const userInfo = this.config.get('user.info', {name: 'judi'});
      console.log(userInfo);
  }
}

Dynamic config update:

import { Injectable } from '@nestjs/common';
import { InjectConfig, ConsulConfig, DynamicConfig, ConfigValue, OnUpdate } from 'nest-consul-config';
 
@Injectable()
export class TestService extends DynamicConfig implements OnUpdate {
  @ConfigValue('user.info', {name: 'judi'})
  private readonly userInfo;
  
  constructor(
      @InjectConfig() private readonly config: ConsulConfig
  ) {
      super(config);
  }
  
  onUpdate() {
      // Some service need re-initial after the config updated, you can execute it here.
  }
 
  getUserInfo() {
      return this.userInfo;
  }
}

API

class ConsulConfigModule

static register(options): DynamicModule

Import nest consul config module.

field	type	description
options.dependencies	string[]	if you are using nest-boot module, please set [NEST_BOOT]
options.key	string	the key of consul kv
options.retry	number	the max retry count when get configuration fail

class ConsulConfig

get(path?: string, defaults?: any): any

Get configuration from consul kv.

field	type	description
path	string	the path of the configuration
defaults	any	default value if the specific configuration is not exist

getKey(): string

Get the current key.

onChange(callback: (configs) => void): void

watch the configurations.

field	type	description
callback	(configs) => void	callback function

async set(path: string, value: any): void

update configuration.

field	type	description
path	string	the path of the configuration
value	any	the configuration

Stay in touch

• Author - NestCloud

License

NestCloud is MIT licensed.