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Viewing file:     fetch-http-handler.js (4.37 KB)      -rw-r--r--

import { HttpResponse } from "@smithy/protocol-http";
import { buildQueryString } from "@smithy/querystring-builder";
import { requestTimeout } from "./request-timeout";
export const keepAliveSupport = {
    supported: Boolean(typeof Request !== "undefined" && "keepalive" in new Request("https://[::1]")),
};
export class FetchHttpHandler {
    static create(instanceOrOptions) {
        if (typeof instanceOrOptions?.handle === "function") {
            return instanceOrOptions;
        }
        return new FetchHttpHandler(instanceOrOptions);
    }
    constructor(options) {
        if (typeof options === "function") {
            this.configProvider = options().then((opts) => opts || {});
        }
        else {
            this.config = options ?? {};
            this.configProvider = Promise.resolve(this.config);
        }
    }
    destroy() {
    }
    async handle(request, { abortSignal } = {}) {
        if (!this.config) {
            this.config = await this.configProvider;
        }
        const requestTimeoutInMs = this.config.requestTimeout;
        const keepAlive = this.config.keepAlive === true;
        if (abortSignal?.aborted) {
            const abortError = new Error("Request aborted");
            abortError.name = "AbortError";
            return Promise.reject(abortError);
        }
        let path = request.path;
        const queryString = buildQueryString(request.query || {});
        if (queryString) {
            path += `?${queryString}`;
        }
        if (request.fragment) {
            path += `#${request.fragment}`;
        }
        let auth = "";
        if (request.username != null || request.password != null) {
            const username = request.username ?? "";
            const password = request.password ?? "";
            auth = `${username}:${password}@`;
        }
        const { port, method } = request;
        const url = `${request.protocol}//${auth}${request.hostname}${port ? `:${port}` : ""}${path}`;
        const body = method === "GET" || method === "HEAD" ? undefined : request.body;
        const requestOptions = {
            body,
            headers: new Headers(request.headers),
            method: method,
        };
        if (body) {
            requestOptions.duplex = "half";
        }
        if (typeof AbortController !== "undefined") {
            requestOptions.signal = abortSignal;
        }
        if (keepAliveSupport.supported) {
            requestOptions.keepalive = keepAlive;
        }
        const fetchRequest = new Request(url, requestOptions);
        const raceOfPromises = [
            fetch(fetchRequest).then((response) => {
                const fetchHeaders = response.headers;
                const transformedHeaders = {};
                for (const pair of fetchHeaders.entries()) {
                    transformedHeaders[pair[0]] = pair[1];
                }
                const hasReadableStream = response.body != undefined;
                if (!hasReadableStream) {
                    return response.blob().then((body) => ({
                        response: new HttpResponse({
                            headers: transformedHeaders,
                            reason: response.statusText,
                            statusCode: response.status,
                            body,
                        }),
                    }));
                }
                return {
                    response: new HttpResponse({
                        headers: transformedHeaders,
                        reason: response.statusText,
                        statusCode: response.status,
                        body: response.body,
                    }),
                };
            }),
            requestTimeout(requestTimeoutInMs),
        ];
        if (abortSignal) {
            raceOfPromises.push(new Promise((resolve, reject) => {
                abortSignal.onabort = () => {
                    const abortError = new Error("Request aborted");
                    abortError.name = "AbortError";
                    reject(abortError);
                };
            }));
        }
        return Promise.race(raceOfPromises);
    }
    updateHttpClientConfig(key, value) {
        this.config = undefined;
        this.configProvider = this.configProvider.then((config) => {
            config[key] = value;
            return config;
        });
    }
    httpHandlerConfigs() {
        return this.config ?? {};
    }
}