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feat: add streaming to XHR driver client

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This commit is contained in:
KernelDeimos 2024-08-22 14:28:09 -04:00
parent fa96c6d146
commit 7600d9b07c
1 changed files with 67 additions and 0 deletions
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67
src/puter-js/src/lib/utils.js
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@ -269,8 +269,75 @@ async function driverCall_(
xhr.responseType = settings.responseType;
}
// ===============================================
// TO UNDERSTAND THIS CODE, YOU MUST FIRST
// UNDERSTAND THE FOLLOWING TEXT:
//
// Everything between here and the comment reading
// "=== END OF STREAMING ===" is ONLY for handling
// requests with content type "application/x-ndjson"
// ===============================================
let is_stream = false;
let got_headers = false;
let signal_stream_update = null;
let lastLength = 0;
let response_complete = false;
const parts_received = [];
xhr.onreadystatechange = () => {
if ( got_headers ) return;
got_headers = true;
if ( xhr.readyState >= 2 ) {
if ( xhr.getResponseHeader("Content-Type") !==
'application/x-ndjson'
) return;
is_stream = true;
const Stream = async function* Stream () {
while ( ! response_complete ) {
const tp = new TeePromise();
signal_stream_update = tp.resolve.bind(tp);
await tp;
if ( response_complete ) break;
while ( parts_received.length > 0 ) {
const value = parts_received.pop();
const parts = value.split('\n');
for ( const part of parts ) {
if ( part.trim() === '' ) continue;
yield JSON.parse(part);
}
}
}
}
return resolve_func(Stream());
}
};
xhr.onprogress = function() {
if ( ! signal_stream_update ) return;
const newText = xhr.responseText.slice(lastLength);
lastLength = xhr.responseText.length; // Update lastLength to the current length
parts_received.push(newText);
signal_stream_update();
};
xhr.addEventListener('load', () => {
response_complete = true;
});
// ========================
// === END OF STREAMING ===
// ========================
// load: success or error
xhr.addEventListener('load', async function(response){
response_complete = true;
if ( is_stream ) {
signal_stream_update?.();
return;
}
const resp = await parseResponse(response.target);
// HTTP Error - unauthorized
if(response.status === 401 || resp?.code === "token_auth_failed"){