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feat: Implement UnsupportedAsyncHandler.

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This commit is contained in:
Ruben Verborgh 2021-01-19 21:43:33 +01:00
parent b9a280e64c
commit dd9d873122
3 changed files with 41 additions and 0 deletions
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1
src/index.ts
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@ -206,5 +206,6 @@ export * from './util/RecordObject';
export * from './util/SequenceHandler';
export * from './util/StreamUtil';
export * from './util/TermUtil';
export * from './util/UnsupportedAsyncHandler';
export * from './util/Vocabularies';
export * from './util/WaterfallHandler';

22
src/util/UnsupportedAsyncHandler.ts Normal file
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@ -0,0 +1,22 @@
import { AsyncHandler } from './AsyncHandler';
import { NotImplementedHttpError } from './errors/NotImplementedHttpError';
/**
* Handler that does not support any input and will always throw an error.
*/
export class UnsupportedAsyncHandler extends AsyncHandler<any, never> {
private readonly errorMessage?: string;
public constructor(errorMessage?: string) {
super();
this.errorMessage = errorMessage;
}
public async canHandle(): Promise<never> {
throw new NotImplementedHttpError(this.errorMessage);
}
public async handle(): Promise<never> {
return this.canHandle();
}
}

18
test/unit/util/UnsupportedAsyncHandler.test.ts Normal file
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@ -0,0 +1,18 @@
import { NotImplementedHttpError } from '../../../src/util/errors/NotImplementedHttpError';
import { UnsupportedAsyncHandler } from '../../../src/util/UnsupportedAsyncHandler';
describe('An UnsupportedAsyncHandler', (): void => {
it('throws a default error when no message is set.', async(): Promise<void> => {
const handler = new UnsupportedAsyncHandler();
await expect(handler.canHandle()).rejects.toThrow(NotImplementedHttpError);
await expect(handler.handle()).rejects.toThrow(NotImplementedHttpError);
await expect(handler.handleSafe(null)).rejects.toThrow(NotImplementedHttpError);
});
it('throws the specified error when a message is set.', async(): Promise<void> => {
const handler = new UnsupportedAsyncHandler('custom error');
await expect(handler.canHandle()).rejects.toThrow('custom error');
await expect(handler.handle()).rejects.toThrow('custom error');
await expect(handler.handleSafe(null)).rejects.toThrow('custom error');
});
});