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feat: switch OpenAI SSE parsing to eventsource-parser

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This commit is contained in:
Jun Siang Cheah 2024-04-30 20:42:55 +01:00
parent 3f0fae1d10
commit e8bf596959
5 changed files with 40 additions and 44 deletions
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9
package-lock.json generated
View file

@ -12,6 +12,7 @@
"async": "^3.2.5",
"bits-ui": "^0.19.7",
"dayjs": "^1.11.10",
"eventsource-parser": "^1.1.2",
"file-saver": "^2.0.5",
"highlight.js": "^11.9.0",
"i18next": "^23.10.0",
@ -3167,6 +3168,14 @@
"integrity": "sha512-tYUSVOGeQPKt/eC1ABfhHy5Xd96N3oIijJvN3O9+TsC28T5V9yX9oEfEK5faP0EFSNVOG97qtAS68GBrQB2hDg==",
"dev": true
},
"node_modules/eventsource-parser": {
"version": "1.1.2",
"resolved": "https://registry.npmjs.org/eventsource-parser/-/eventsource-parser-1.1.2.tgz",
"integrity": "sha512-v0eOBUbiaFojBu2s2NPBfYUoRR9GjcDNvCXVaqEf5vVfpIAh9f8RCo4vXTP8c63QRKCFwoLpMpTdPwwhEKVgzA==",
"engines": {
"node": ">=14.18"
}
},
"node_modules/execa": {
"version": "4.1.0",
"resolved": "https://registry.npmjs.org/execa/-/execa-4.1.0.tgz",

1
package.json
View file

@ -49,6 +49,7 @@
"async": "^3.2.5",
"bits-ui": "^0.19.7",
"dayjs": "^1.11.10",
"eventsource-parser": "^1.1.2",
"file-saver": "^2.0.5",
"highlight.js": "^11.9.0",
"i18next": "^23.10.0",

48
src/lib/apis/streaming/index.ts
View file

@ -1,15 +1,22 @@
import { EventSourceParserStream } from 'eventsource-parser/stream';
import type { ParsedEvent } from 'eventsource-parser';
type TextStreamUpdate = {
done: boolean;
value: string;
};
// createOpenAITextStream takes a ReadableStreamDefaultReader from an SSE response,
// createOpenAITextStream takes a responseBody with a SSE response,
// and returns an async generator that emits delta updates with large deltas chunked into random sized chunks
export async function createOpenAITextStream(
messageStream: ReadableStreamDefaultReader,
responseBody: ReadableStream<Uint8Array>,
splitLargeDeltas: boolean
): Promise<AsyncGenerator<TextStreamUpdate>> {
let iterator = openAIStreamToIterator(messageStream);
const eventStream = responseBody
.pipeThrough(new TextDecoderStream())
.pipeThrough(new EventSourceParserStream())
.getReader();
let iterator = openAIStreamToIterator(eventStream);
if (splitLargeDeltas) {
iterator = streamLargeDeltasAsRandomChunks(iterator);
}
@ -17,7 +24,7 @@ export async function createOpenAITextStream(
}
async function* openAIStreamToIterator(
reader: ReadableStreamDefaultReader
reader: ReadableStreamDefaultReader<ParsedEvent>
): AsyncGenerator<TextStreamUpdate> {
while (true) {
const { value, done } = await reader.read();
@ -25,34 +32,25 @@ async function* openAIStreamToIterator(
yield { done: true, value: '' };
break;
}
const lines = value.split('\n');
for (let line of lines) {
if (line.endsWith('\r')) {
// Remove trailing \r
line = line.slice(0, -1);
}
if (line !== '') {
console.log(line);
if (line === 'data: [DONE]') {
yield { done: true, value: '' };
} else if (line.startsWith(':')) {
// Events starting with : are comments https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#event_stream_format
// OpenRouter sends heartbeats like ": OPENROUTER PROCESSING"
if (!value) {
continue;
} else {
try {
const data = JSON.parse(line.replace(/^data: /, ''));
console.log(data);
}
const data = value.data;
if (data.startsWith('[DONE]')) {
yield { done: true, value: '' };
break;
}
yield { done: false, value: data.choices?.[0]?.delta?.content ?? '' };
try {
const parsedData = JSON.parse(data);
console.log(parsedData);
yield { done: false, value: parsedData.choices?.[0]?.delta?.content ?? '' };
} catch (e) {
console.error('Error extracting delta from SSE event:', e);
}
}
}
}
}
}
// streamLargeDeltasAsRandomChunks will chunk large deltas (length > 5) into random sized chunks between 1-3 characters
// This is to simulate a more fluid streaming, even though some providers may send large chunks of text at once

10
src/routes/(app)/+page.svelte
View file

@ -605,14 +605,8 @@
scrollToBottom();
if (res && res.ok) {
const reader = res.body
.pipeThrough(new TextDecoderStream())
.pipeThrough(splitStream('\n'))
.getReader();
const textStream = await createOpenAITextStream(reader, $settings.splitLargeChunks);
console.log(textStream);
if (res && res.ok && res.body) {
const textStream = await createOpenAITextStream(res.body, $settings.splitLargeChunks);
for await (const update of textStream) {
const { value, done } = update;

10
src/routes/(app)/c/[id]/+page.svelte
View file

@ -617,14 +617,8 @@
scrollToBottom();
if (res && res.ok) {
const reader = res.body
.pipeThrough(new TextDecoderStream())
.pipeThrough(splitStream('\n'))
.getReader();
const textStream = await createOpenAITextStream(reader, $settings.splitLargeChunks);
console.log(textStream);
if (res && res.ok && res.body) {
const textStream = await createOpenAITextStream(res.body, $settings.splitLargeChunks);
for await (const update of textStream) {
const { value, done } = update;