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destination-service.ts
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destination-service.ts
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/* Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. */
import { errorWithCause, propertyExists } from '@sap-cloud-sdk/util';
import axios, { AxiosError, AxiosPromise, AxiosRequestConfig } from 'axios';
import { wrapJwtInHeader } from '../util';
import { getAxiosConfigWithDefaults } from '../http-client';
import { parseDestination } from './destination';
import { Destination } from './destination-service-types';
import {
circuitBreakerDefaultOptions,
ResilienceOptions
} from './resilience-options';
// For some reason, the equivalent import statement does not work
/* eslint-disable-next-line @typescript-eslint/no-var-requires */
const CircuitBreaker = require('opossum');
/**
* Fetches all instance destinations from the given URI.
*
* @param destinationServiceUri - The URI of the destination service
* @param jwt - The access token
* @param options - Options to use by retrieving destinations
* @returns A promise resolving to a list of instance destinations
*/
export function fetchInstanceDestinations(
destinationServiceUri: string,
jwt: string,
options?: ResilienceOptions
): Promise<Destination[]> {
return fetchDestinations(
destinationServiceUri,
jwt,
DestinationType.Instance,
options
);
}
/**
* Fetches all subaccount destinations from the given URI.
*
* @param destinationServiceUri - The URI of the destination service
* @param jwt - The access token
* @param options - Options to use by retrieving destinations
* @returns A promise resolving to a list of subaccount destinations
*/
export function fetchSubaccountDestinations(
destinationServiceUri: string,
jwt: string,
options?: ResilienceOptions
): Promise<Destination[]> {
return fetchDestinations(
destinationServiceUri,
jwt,
DestinationType.Subaccount,
options
);
}
enum DestinationType {
Instance = 'instance',
Subaccount = 'subaccount'
}
function fetchDestinations(
destinationServiceUri: string,
jwt: string,
type: DestinationType,
options?: ResilienceOptions
): Promise<Destination[]> {
const targetUri = `${destinationServiceUri.replace(
/\/$/,
''
)}/destination-configuration/v1/${type}Destinations`;
return callDestinationService(targetUri, jwt, options)
.then(response => response.data.map(d => parseDestination(d)))
.catch(error =>
Promise.reject(
errorWithCause(
`Failed to fetch ${type} destinations.${errorMessageFromResponse(
error
)}`,
error
)
)
);
}
/**
* Fetches a specific destination by name from the given URI, including authorization tokens.
* For destinations with authenticationType OAuth2SAMLBearerAssertion, this call will trigger the OAuth2SAMLBearerFlow against the target destination.
*
* @param destinationServiceUri - The URI of the destination service
* @param jwt - The access token
* @param destinationName - The name of the desired destination
* @param options - Options to use by retrieving destinations
* @returns A Promise resolving to the destination
*/
export function fetchDestination(
destinationServiceUri: string,
jwt: string,
destinationName: string,
options?: ResilienceOptions
): Promise<Destination> {
const targetUri = `${destinationServiceUri.replace(
/\/$/,
''
)}/destination-configuration/v1/destinations/${destinationName}`;
return callDestinationService(targetUri, jwt, options)
.then(response => parseDestination(response.data))
.catch(error =>
Promise.reject(
errorWithCause(
`Failed to fetch destination ${destinationName}.${errorMessageFromResponse(
error
)}`,
error
)
)
);
}
function errorMessageFromResponse(error: AxiosError): string {
return propertyExists(error, 'response', 'data', 'ErrorMessage')
? ` ${error.response!.data.ErrorMessage}`
: '';
}
function callDestinationService(
uri: string,
jwt: string,
options: ResilienceOptions = { enableCircuitBreaker: true }
): AxiosPromise {
const config: AxiosRequestConfig = {
...getAxiosConfigWithDefaults(),
url: uri,
headers: wrapJwtInHeader(jwt).headers
};
if (
options.enableCircuitBreaker ||
options.enableCircuitBreaker === undefined
) {
return getInstanceCircuitBreaker().fire(uri, config);
}
return axios.request(config);
}
function getInstanceCircuitBreaker(breaker?: any): any {
return typeof breaker === 'undefined'
? new CircuitBreaker(axios.get, circuitBreakerDefaultOptions)
: breaker;
}