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Refactor server-sent events parsing

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Create one server-sent events stream class which implements the entire
spec (different line endings, chunking, etc) and use it in all the
streaming generators.
This commit is contained in:
valadaptive
2023-12-06 22:55:17 -05:00
parent 6f610204d6
commit 5540c165cf
5 changed files with 158 additions and 156 deletions
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54
public/scripts/textgen-settings.js
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@@ -14,6 +14,7 @@ import {
power_user,
registerDebugFunction,
} from './power-user.js';
import EventSourceStream from './sse-stream.js';
import { SENTENCEPIECE_TOKENIZERS, getTextTokens, tokenizers } from './tokenizers.js';
import { getSortableDelay, onlyUnique } from './utils.js';
@@ -475,55 +476,30 @@ async function generateTextGenWithStreaming(generate_data, signal) {
method: 'POST',
signal: signal,
});
const eventStream = new EventSourceStream();
response.body.pipeThrough(eventStream);
const reader = eventStream.readable.getReader();
return async function* streamData() {
const decoder = new TextDecoder();
const reader = response.body.getReader();
let getMessage = '';
let messageBuffer = '';
let text = '';
const swipes = [];
while (true) {
const { done, value } = await reader.read();
// We don't want carriage returns in our messages
let response = decoder.decode(value).replace(/\r/g, '');
if (done) return;
if (value.data === '[DONE]') return;
tryParseStreamingError(response);
tryParseStreamingError(response, value.data);
let eventList = [];
let data = JSON.parse(value.data);
messageBuffer += response;
eventList = messageBuffer.split('\n\n');
// Last element will be an empty string or a leftover partial message
messageBuffer = eventList.pop();
for (let event of eventList) {
if (event.startsWith('event: completion')) {
event = event.split('\n')[1];
}
if (typeof event !== 'string' || !event.length)
continue;
if (!event.startsWith('data'))
continue;
if (event == 'data: [DONE]') {
return;
}
let data = JSON.parse(event.substring(6));
if (data?.choices[0]?.index > 0) {
const swipeIndex = data.choices[0].index - 1;
swipes[swipeIndex] = (swipes[swipeIndex] || '') + data.choices[0].text;
} else {
getMessage += data?.choices[0]?.text || '';
}
yield { text: getMessage, swipes: swipes };
if (data?.choices[0]?.index > 0) {
const swipeIndex = data.choices[0].index - 1;
swipes[swipeIndex] = (swipes[swipeIndex] || '') + data.choices[0].text;
} else {
text += data?.choices[0]?.text || '';
}
if (done) {
return;
}
yield { text, swipes };
}
};
}