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add abort controller support

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ading2210 2024-03-10 10:24:42 -04:00
parent 954ce1f60b
commit b9b871b25a
5 changed files with 40 additions and 7 deletions
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36
client/javascript/main.js
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@ -173,6 +173,25 @@ async function create_options(params) {
function perform_request_async(url, params, body) {
return new Promise((resolve, reject) => {
let stream_controller;
let http_handle;
let response_obj;
let aborted = false;
//handle abort signals
if (params.signal instanceof AbortSignal) {
params.signal.addEventListener("abort", () => {
if (aborted) return;
aborted = true;
_cleanup_handle(http_handle);
if (!response_obj) {
reject(new DOMException("The operation was aborted."));
}
else {
stream_controller.error("The operation was aborted.");
}
});
}
let stream = new ReadableStream({
start(controller) {
stream_controller = controller;
@ -180,10 +199,21 @@ function perform_request_async(url, params, body) {
});
function data_callback(new_data) {
stream_controller.enqueue(new_data);
try {
stream_controller.enqueue(new_data);
}
catch (e) {
//the readable stream has been closed elsewhere, so cancel the request
if (e instanceof TypeError) {
_cleanup_handle(http_handle);
}
else {
throw e;
}
}
}
function headers_callback(response_info) {
let response_obj = create_response(stream, response_info);
response_obj = create_response(stream, response_info);
resolve(response_obj);
}
function finish_callback(error) {
@ -196,7 +226,7 @@ function perform_request_async(url, params, body) {
stream_controller.close();
}
perform_request(url, params, data_callback, finish_callback, headers_callback, body);
http_handle = perform_request(url, params, data_callback, finish_callback, headers_callback, body);
});
}