Mobicoop V3 - Configuration package

NPM package used to get / set configuration items for Mobicoop V3 services into a Redis database.

Requirements

• a running Redis server

Installation

npm install --save @mobicoop/configuration-module

Usage

Add the module in the imports section of the parent module, for example, using NestJs ConfigModule to inject values from .env:

...
import {
  ConfigurationModule,
  ConfigurationModuleOptions,
} from '@mobicoop/configuration-module';
import { ConfigModule, ConfigService } from '@nestjs/config';
...
imports: [
    ConfigModule.forRoot({ isGlobal: true }),
    ConfigurationModule.forRootAsync({
        imports: [ConfigModule],
        inject: [ConfigService],
        useFactory: async (
        configService: ConfigService,
        ): Promise<ConfigurationModuleOptions> => ({
            host: configService.get<string>('REDIS_HOST'),
            password: configService.get<string>('REDIS_PASSWORD'),
            port: configService.get<number>('REDIS_PORT'),
        }),
    }),
],
...

You need to set the following options :

• host : the redis hostname
• password : the redis password
• port : the redis port

Then you need to inject the ConfigurationRepository in a service with the appropriate port (GetConfigurationRepositoryPort to get a value, SetConfigurationRepositoryPort to set a value) :

...
import {
  ConfigurationDomain,
  ConfigurationType,
  ConfigurationValue,
  GetConfigurationRepositoryPort,
} from '@mobicoop/configuration-module';
...
constructor(
    @Inject(CONFIGURATION_REPOSITORY)
    private readonly configurationRepository: GetConfigurationRepositoryPort,
  ) {}
...
const myValue: ConfigurationValue = await this.configurationRepository.get(
    {
    domain: ConfigurationDomain.CARPOOL,
    key: 'seatsProposed',
    type: ConfigurationType.INT,
    },
);
...

The get methods requires an identifier (a domain and a key) as well as as a return type : the value will automatically be casted from string (as Redis stores values as strings) to the required type.

The mget can return many items but for a single domain. It requires the domain and a list of keys with their return type. It returns a Configurator object, that contains the list of configuration items (consisting in the domain, a key, and the value associated casted to the required type), as well as a get method to get a configuration value by its key. If one of the identifiers is not found, the whole methods throws.

The set methods requires an identifier (a domain and a key) and a value. The value will be casted to string (as Redis stores values as strings).

Available domains

• AUTH : authentication & authorization related configuration items (eg. default password encryption algorithm)
• CARPOOL : carpool related configuration items (eg. default number of seats proposed as a driver)
• GEOGRAPHY : geographic related configuration items (eg. georouter settings)
• MATCH : matching related configuration items (eg. default algorithm type)
• PAGINATION : pagination related configuration items (eg. default number of results per page)

New domains will be added in the future depending on the needs !

Available types

As Redis stores values as strings, we need to cast these values when we get them. The available types are :

• BOOLEAN
• INT
• FLOAT
• JSON
• JSON_ARRAY
• STRING
• STRING_ARRAY (stored in redis as a comma-separated string)
• INT_ARRAY (stored in redis as a comma-separated string)
• FLOAT_ARRAY (stored in redis as a comma-separated string)