@sap-cloud-sdk/resilience/dist/circuit-breaker.js

SAP Cloud SDK for JavaScript resilience

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.circuitBreakerDefaultOptions = exports.circuitBreakers = void 0;
exports.circuitBreaker = circuitBreaker;
const opossum_1 = __importDefault(require("opossum"));
/**
 * Map of all existing circuit breakers.
 * Entries are added in a lazy way.
 * TODO:
 *  The value type here should be CircuitBreaker, but this would make the Opossum types part of our public API.
 *  This happens although it is marked as internal, because transpilation includes internal.
 *  Adding CircuitBreaker will break transpilation on generation.
 * @internal
 */
exports.circuitBreakers = {};
/**
 * @internal
 */
exports.circuitBreakerDefaultOptions = {
    timeout: false,
    errorThresholdPercentage: 50,
    volumeThreshold: 10,
    resetTimeout: 30000,
    cache: false
};
function httpErrorFilter(error) {
    return (!!error.response?.status && error.response.status.toString().startsWith('4'));
}
function circuitBreakerKeyBuilder({ uri, tenantId = 'tenant_id' }) {
    return `${uri}::${tenantId}`;
}
/**
 * Helper method to build a circuit breaker middleware.
 * @returns The middleware adding a circuit breaker to the function.
 */
function circuitBreaker() {
    return circuitBreakerGeneric(circuitBreakerKeyBuilder, httpErrorFilter);
}
function circuitBreakerGeneric(keyBuilder, errorFilter) {
    return (options) => fnArgument => getCircuitBreaker(keyBuilder(options.context), errorFilter).fire(options.fn, fnArgument);
}
function getCircuitBreaker(key, errorFilter) {
    if (!exports.circuitBreakers[key]) {
        exports.circuitBreakers[key] = new opossum_1.default(executeFunction, {
            ...exports.circuitBreakerDefaultOptions,
            errorFilter
        });
    }
    return exports.circuitBreakers[key];
}
function executeFunction(fn, ...parameters) {
    return fn(...parameters);
}
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