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handlers.server.ts
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handlers.server.ts
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import { makeReadableStream, makeWebSocket } from "./channel.ts";
import type {
ClientMessage,
ClientMessageHandler,
DataEndMessage,
DataMessage,
RegisterMessage,
ResponseStartMessage,
WSConnectionClosed,
WSMessage,
} from "./messages.ts";
import { arrayBufferSerializer } from "./serializers.ts";
/**
* List of status codes that represent null bodies in responses.
* @type {number[]}
*/
const NULL_BODIES = [101, 204, 205, 304];
/**
* Handler for the 'response-start' client message.
* @param {ClientState} state - The client state.
* @param {ResponseStartMessage} message - The message data.
*/
const onResponseStart: ClientMessageHandler<ResponseStartMessage> = (
state,
message,
) => {
const request = state.ongoingRequests[message.id];
if (!request) {
console.error(
new Date(),
"Didn't find response object, probably dead?",
);
return;
}
const headers = new Headers();
Object.entries(message.headers).forEach(
([key, value]: [string, string | Array<string>]) => {
if (typeof value === "string") {
headers.set(key, value);
} else if (Array.isArray(value)) {
value.forEach((v) => {
headers.append(key, v);
});
}
},
);
const shouldBeNullBody = NULL_BODIES.includes(message.statusCode);
const stream = !shouldBeNullBody && request.responseBodyChan
? makeReadableStream(request.responseBodyChan, state.ch.out.signal)
: undefined;
const resp = new Response(stream, {
status: message.statusCode,
statusText: message.statusMessage,
headers,
});
request.requestObject?.signal?.addEventListener?.("abort", () => {
if (message.id in state.ongoingRequests) {
delete state.ongoingRequests[message.id];
request.responseObject.reject(
new DOMException("Connection closed", "AbortError"),
);
request?.responseBodyChan?.close?.();
}
});
request.responseObject.resolve(resp);
};
/**
* Handler for the 'data' client message.
* @param {ClientState} state - The client state.
* @param {DataMessage} message - The message data.
*/
const data: ClientMessageHandler<DataMessage> = async (state, message) => {
const request = state.ongoingRequests[message.id];
if (!request) {
return;
}
try {
await request.responseBodyChan?.send(
message.chunk,
);
} catch (_err) {
console.log("Request was aborted", _err);
}
};
/**
* Handler for the 'data-end' client message.
* @param {ClientState} state - The client state.
* @param {DataEndMessage} message - The message data.
*/
const onDataEnd: ClientMessageHandler<DataEndMessage> = (state, message) => {
const request = state.ongoingRequests[message.id];
if (!request) {
return;
}
if (message.error) {
request.responseObject.reject(
new DOMException("Connection closed", JSON.stringify(message.error)),
);
return;
}
try {
request.responseBodyChan?.close?.();
} catch (_err) {
console.log(`error closing body chan`, _err);
}
};
/**
* Handler for the 'ws-closed' client message.
* @param {ClientState} state - The client state.
* @param {WSConnectionClosed} message - The message data.
*/
const onWsClosed: ClientMessageHandler<WSConnectionClosed> = (
state,
message,
) => {
delete state.ongoingRequests[message.id];
};
/**
* Handler for the 'ws-message' client message.
* @param {ClientState} state - The client state.
* @param {WSMessage} message - The message data.
*/
const onWsMessage: ClientMessageHandler<WSMessage> = async (state, message) => {
await state.ongoingRequests?.[message.id]?.webSocketChan?.send(message.data);
};
/**
* Handler for the 'ws-opened' client message.
* @param {ClientState} state - The client state.
* @param {DataEndMessage} message - The message data.
*/
const onWsOpened: ClientMessageHandler<DataEndMessage> = async (
state,
message,
) => {
const request = state.ongoingRequests[message.id];
if (!request) {
return;
}
try {
const { socket, response } = Deno.upgradeWebSocket(request.requestObject);
request.responseObject.resolve(response);
const socketChan = await makeWebSocket<
ArrayBuffer,
ArrayBuffer,
ArrayBuffer
>(
socket,
arrayBufferSerializer(),
);
request.webSocketChan = socketChan.out;
(async () => {
const signal = state.ch.out.signal;
try {
for await (const msg of socketChan.in.recv(signal)) {
await state.ch.out.send({
type: "ws-message",
id: message.id,
data: msg,
});
}
if (signal.aborted) {
return;
}
await state.ch.out.send({ type: "ws-closed", id: message.id });
} catch (error) {
if (signal.aborted) {
console.log("sending through a closed channel error", error, message);
} else {
console.error(
`unexpected error when handling websocket message`,
error,
message,
);
}
} finally {
try {
socket.close();
} catch (_err) {
// ignore
}
}
})();
} catch (err) {
console.error(new Date(), "Error upgrading websocket", err);
delete state.ongoingRequests[message.id];
}
};
/**
* Handler for the 'register' client message.
* @param {ClientState} state - The client state.
* @param {RegisterMessage} message - The message data.
*/
const register: ClientMessageHandler<RegisterMessage> = async (
state,
message,
) => {
if (state.apiKeys.includes(message.apiKey)) {
state.controller.link(message.domain);
await state.ch.out.send({
type: "registered",
domain: message.domain,
id: message.id,
});
} else {
console.error(
new Date(),
"Given API key is wrong/not recognised, stopping connection",
message,
);
await state.ch.out.send({ type: "error", message: "Invalid API key" });
state.socket.close();
}
};
/**
* A record mapping client message types to their respective handlers.
* @type {Record<ClientMessage["type"], ClientMessageHandler<any>>}
* @ignore
*/
// deno-lint-ignore no-explicit-any
const handlersByType: Record<ClientMessage["type"], ClientMessageHandler<any>> =
{
"response-start": onResponseStart,
data,
"data-end": onDataEnd,
"ws-closed": onWsClosed,
"ws-message": onWsMessage,
"ws-opened": onWsOpened,
register,
};
/**
* Handles client messages received from the server.
* @param {ClientState} state - The client state.
* @param {ClientMessage} message - The message received from the server.
*/
export const handleClientMessage: ClientMessageHandler = async (
state,
message,
) => {
await handlersByType?.[message.type]?.(state, message)?.catch?.((err) => {
console.error(
"unexpected error happening when handling message",
message,
err,
);
delete state.ongoingRequests[message.id];
});
};