Undici request handler for aws-sdk

UndiciHandler.ts

import {HttpHandler, HttpRequest, HttpResponse} from "@aws-sdk/protocol-http";
import {HttpHandlerOptions, RequestHandlerMetadata, RequestHandlerOutput} from "@aws-sdk/types";
import {Agent, Dispatcher} from "undici";

export class UndiciHandler implements HttpHandler {
    private readonly agent = new Agent()

    metadata: RequestHandlerMetadata = {
        handlerProtocol: "http"
    }

    async handle(request: HttpRequest, handlerOptions: HttpHandlerOptions = {}): Promise<RequestHandlerOutput<HttpResponse>> {
        const response = await this.agent.request({
            method: request.method as Dispatcher.HttpMethod,
            headers: request.headers,
            origin: `${request.protocol}//${request.hostname}`,
            path: request.path,
            query: request.query,
            body: request.body,
            signal: handlerOptions.abortSignal,
        })
        const headerBag: Record<string, string> = {}
        for (const [name, value] of Object.entries(response.headers)) {
            if (typeof value === "string")
                headerBag[name] = value
            else if (Array.isArray(value))
                headerBag[name] = value[0]
        }
        return {
            response: new HttpResponse({
                headers: headerBag,
                statusCode: response.statusCode,
                body: response.body
            })
        }
    }

    destroy(): void {
        this.agent.destroy()
    }
}