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import { decodePacket } from "engine.io-parser";
import { Emitter } from "@socket.io/component-emitter";
import { installTimerFunctions } from "./util.js";
import { encode } from "./contrib/parseqs.js";
import debugModule from "debug"; // debug()
const debug = debugModule("engine.io-client:transport"); // debug()
export class TransportError extends Error {
constructor(reason, description, context) {
super(reason);
this.description = description;
this.context = context;
this.type = "TransportError";
}
}
export class Transport extends Emitter {
/**
* Transport abstract constructor.
*
* @param {Object} opts - options
* @protected
*/
constructor(opts) {
super();
this.writable = false;
installTimerFunctions(this, opts);
this.opts = opts;
this.query = opts.query;
this.socket = opts.socket;
this.supportsBinary = !opts.forceBase64;
}
/**
* Emits an error.
*
* @param {String} reason
* @param description
* @param context - the error context
* @return {Transport} for chaining
* @protected
*/
onError(reason, description, context) {
super.emitReserved("error", new TransportError(reason, description, context));
return this;
}
/**
* Opens the transport.
*/
open() {
this.readyState = "opening";
this.doOpen();
return this;
}
/**
* Closes the transport.
*/
close() {
if (this.readyState === "opening" || this.readyState === "open") {
this.doClose();
this.onClose();
}
return this;
}
/**
* Sends multiple packets.
*
* @param {Array} packets
*/
send(packets) {
if (this.readyState === "open") {
this.write(packets);
}
else {
// this might happen if the transport was silently closed in the beforeunload event handler
debug("transport is not open, discarding packets");
}
}
/**
* Called upon open
*
* @protected
*/
onOpen() {
this.readyState = "open";
this.writable = true;
super.emitReserved("open");
}
/**
* Called with data.
*
* @param {String} data
* @protected
*/
onData(data) {
const packet = decodePacket(data, this.socket.binaryType);
this.onPacket(packet);
}
/**
* Called with a decoded packet.
*
* @protected
*/
onPacket(packet) {
super.emitReserved("packet", packet);
}
/**
* Called upon close.
*
* @protected
*/
onClose(details) {
this.readyState = "closed";
super.emitReserved("close", details);
}
/**
* Pauses the transport, in order not to lose packets during an upgrade.
*
* @param onPause
*/
pause(onPause) { }
createUri(schema, query = {}) {
return (schema +
"://" +
this._hostname() +
this._port() +
this.opts.path +
this._query(query));
}
_hostname() {
const hostname = this.opts.hostname;
return hostname.indexOf(":") === -1 ? hostname : "[" + hostname + "]";
}
_port() {
if (this.opts.port &&
((this.opts.secure && Number(this.opts.port) !== 443) ||
(!this.opts.secure && Number(this.opts.port) !== 80))) {
return ":" + this.opts.port;
}
else {
return "";
}
}
_query(query) {
const encodedQuery = encode(query);
return encodedQuery.length ? "?" + encodedQuery : "";
}
}