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// Copyright 2019 Yusuke Sakurai. All rights reserved. MIT license.import Writer = Deno.Writer;import { writeResponse, writeTrailers } from "./serveio.ts";import { ServerResponse } from "./server.ts";
/** basic responder for http response */export interface ServerResponder {  respond(response: ServerResponse): Promise<void>;  writeTrailers(trailers: Headers): Promise<void>;  isResponded(): boolean;}
/** create ServerResponder object */export function createResponder(w: Writer): ServerResponder {  let isResponded = false;  let headers: Headers;  return {    isResponded() {      return isResponded;    },    async writeTrailers(trailers: Headers): Promise<void> {      if (!isResponded) {        throw new Error("trailer headers can't be written before responding");      }      await writeTrailers(w, headers, trailers);    },    async respond(response: ServerResponse): Promise<void> {      if (isResponded) {        throw new Error("http: already responded");      }      headers = response.headers;      isResponded = true;      return writeResponse(w, response);    }  };}