Comments (6)
I started to work on @configuration
For now I have something like this:
Decorator:
import 'reflect-metadata';
import {ConfigurationMetadata} from '../../interfaces/configuration-metadata.interface';
import {isNil, isObject} from '../shared.utils';
import {FILE_METADATA, IN_MEMORY_METADATA, URL_METADATA} from '../../constants';
export const Configuration = (metadata?: ConfigurationMetadata): ClassDecorator => {
return isObject(metadata) ? ConfigurationFrom(metadata) : InMemoryConfiguration();
};
const InMemoryConfiguration = (): ClassDecorator => {
return (target: object) => {
Reflect.defineMetadata(IN_MEMORY_METADATA, true, target);
}
};
const ConfigurationFrom = (metadata: ConfigurationMetadata): ClassDecorator => {
if (!isNil(metadata.file))
return FileConfiguration(metadata.file);
else if (!isNil(metadata.url))
return RemoteConfiguration(metadata.url);
};
const FileConfiguration = (filename: string): ClassDecorator => {
return (target: object) => {
Reflect.defineMetadata(FILE_METADATA, filename, target);
}
};
const RemoteConfiguration = (url: string): ClassDecorator => {
return (target: object) => {
Reflect.defineMetadata(URL_METADATA, url, target);
}
};
Helper classes:
export interface IConfiguration {
getProperty(name: string): string;
}
export abstract class AbstractConfiguration implements IConfiguration {
constructor(protected properties: {[key: string]: string} = {}) {}
public getProperty(name: string): string {
return this.properties[name];
}
}
export abstract class AbstractInMemoryConfiguration extends AbstractConfiguration{
constructor() {
super();
this.declare();
}
protected abstract declare(): void;
}
And a use case:
class TestConfiguration extends AbstractInMemoryConfiguration {
protected declare(): void {
this.properties['KEY'] = 'VALUE';
}
}
Regarding the @configuration decorator I can declare it like this:
@Configuration()
class TestConfiguration extends AbstractInMemoryConfiguration { }
@Configuration(file: 'filename')
class TestConfiguration extends AbstractFileConfiguration { }
@Configuration(url: 'http://domain/path')
class TestConfiguration extends AbstractRemoteConfiguration { }
Does it seem to be good for you guys ?
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Are you sure we really need the abstraction layer over configuration stuff? I think now it's easy to fetch the remote configuration / load config using fs package just before creating the Nest instance. If the configuration affects components and should be a part of the DI container - just use async components. What @thomrick proposed looks really good, but I'm trying to keep in mind that learning curve is already big enough 😃
from nest.
Hi @thomrick,
Thank you so much for the invested time, but I just don't want to exaggerate. Maybe in the future, but not now 🙂 Kamil
from nest.
@kamilmysliwiec could you leave it open? It's very nice feature.
from nest.
You convinced me.
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This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
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