Spaces:
Running
Running
File size: 10,999 Bytes
b82d373 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 |
import { eventSource, event_types } from '../script.js';
import { power_user } from './power-user.js';
import { delay } from './utils.js';
/**
* A stream which handles Server-Sent Events from a binary ReadableStream like you get from the fetch API.
*/
class EventSourceStream {
constructor() {
const decoder = new TextDecoderStream('utf-8');
let streamBuffer = '';
let lastEventId = '';
function processChunk(controller) {
// Events are separated by two newlines
const events = streamBuffer.split(/\r\n\r\n|\r\r|\n\n/g);
if (events.length === 0) return;
// The leftover text to remain in the buffer is whatever doesn't have two newlines after it. If the buffer ended
// with two newlines, this will be an empty string.
streamBuffer = events.pop();
for (const eventChunk of events) {
let eventType = '';
// Split up by single newlines.
const lines = eventChunk.split(/\n|\r|\r\n/g);
let eventData = '';
for (const line of lines) {
const lineMatch = /([^:]+)(?:: ?(.*))?/.exec(line);
if (lineMatch) {
const field = lineMatch[1];
const value = lineMatch[2] || '';
switch (field) {
case 'event':
eventType = value;
break;
case 'data':
eventData += value;
eventData += '\n';
break;
case 'id':
// The ID field cannot contain null, per the spec
if (!value.includes('\0')) lastEventId = value;
break;
// We do nothing for the `delay` type, and other types are explicitly ignored
}
}
}
// https://html.spec.whatwg.org/multipage/server-sent-events.html#dispatchMessage
// Skip the event if the data buffer is the empty string.
if (eventData === '') continue;
if (eventData[eventData.length - 1] === '\n') {
eventData = eventData.slice(0, -1);
}
// Trim the *last* trailing newline only.
const event = new MessageEvent(eventType || 'message', { data: eventData, lastEventId });
controller.enqueue(event);
}
}
const sseStream = new TransformStream({
transform(chunk, controller) {
streamBuffer += chunk;
processChunk(controller);
},
});
decoder.readable.pipeThrough(sseStream);
this.readable = sseStream.readable;
this.writable = decoder.writable;
}
}
/**
* Gets a delay based on the character.
* @param {string} s The character.
* @returns {number} The delay in milliseconds.
*/
function getDelay(s) {
if (!s) {
return 0;
}
const speedFactor = Math.max(100 - power_user.smooth_streaming_speed, 1);
const defaultDelayMs = speedFactor * 0.4;
const punctuationDelayMs = defaultDelayMs * 25;
if ([',', '\n'].includes(s)) {
return punctuationDelayMs / 2;
}
if (['.', '!', '?'].includes(s)) {
return punctuationDelayMs;
}
return defaultDelayMs;
}
/**
* Parses the stream data and returns the parsed data and the chunk to be sent.
* @param {object} json The JSON data.
* @returns {AsyncGenerator<{data: object, chunk: string}>} The parsed data and the chunk to be sent.
*/
async function* parseStreamData(json) {
// Claude
if (typeof json.delta === 'object') {
if (typeof json.delta.text === 'string' && json.delta.text.length > 0) {
for (let i = 0; i < json.delta.text.length; i++) {
const str = json.delta.text[i];
yield {
data: { ...json, delta: { text: str } },
chunk: str,
};
}
}
return;
}
// MakerSuite
else if (Array.isArray(json.candidates)) {
for (let i = 0; i < json.candidates.length; i++) {
const isNotPrimary = json.candidates?.[0]?.index > 0;
if (isNotPrimary || json.candidates.length === 0) {
return null;
}
if (typeof json.candidates[0].content === 'object' && Array.isArray(json.candidates[i].content.parts)) {
for (let j = 0; j < json.candidates[i].content.parts.length; j++) {
if (typeof json.candidates[i].content.parts[j].text === 'string') {
for (let k = 0; k < json.candidates[i].content.parts[j].text.length; k++) {
const str = json.candidates[i].content.parts[j].text[k];
const candidateClone = structuredClone(json.candidates[0]);
candidateClone.content.parts[j].text = str;
const candidates = [candidateClone];
yield {
data: { ...json, candidates },
chunk: str,
};
}
}
}
}
}
return;
}
// NovelAI / KoboldCpp Classic
else if (typeof json.token === 'string' && json.token.length > 0) {
for (let i = 0; i < json.token.length; i++) {
const str = json.token[i];
yield {
data: { ...json, token: str },
chunk: str,
};
}
return;
}
// llama.cpp?
else if (typeof json.content === 'string' && json.content.length > 0 && json.object !== 'chat.completion.chunk') {
for (let i = 0; i < json.content.length; i++) {
const str = json.content[i];
yield {
data: { ...json, content: str },
chunk: str,
};
}
return;
}
// OpenAI-likes
else if (Array.isArray(json.choices)) {
const isNotPrimary = json?.choices?.[0]?.index > 0;
if (isNotPrimary || json.choices.length === 0) {
throw new Error('Not a primary swipe');
}
if (typeof json.choices[0].text === 'string' && json.choices[0].text.length > 0) {
for (let j = 0; j < json.choices[0].text.length; j++) {
const str = json.choices[0].text[j];
const choiceClone = structuredClone(json.choices[0]);
choiceClone.text = str;
const choices = [choiceClone];
yield {
data: { ...json, choices },
chunk: str,
};
}
return;
}
else if (typeof json.choices[0].delta === 'object') {
if (typeof json.choices[0].delta.text === 'string' && json.choices[0].delta.text.length > 0) {
for (let j = 0; j < json.choices[0].delta.text.length; j++) {
const str = json.choices[0].delta.text[j];
const choiceClone = structuredClone(json.choices[0]);
choiceClone.delta.text = str;
const choices = [choiceClone];
yield {
data: { ...json, choices },
chunk: str,
};
}
return;
}
else if (typeof json.choices[0].delta.content === 'string' && json.choices[0].delta.content.length > 0) {
for (let j = 0; j < json.choices[0].delta.content.length; j++) {
const str = json.choices[0].delta.content[j];
const choiceClone = structuredClone(json.choices[0]);
choiceClone.delta.content = str;
const choices = [choiceClone];
yield {
data: { ...json, choices },
chunk: str,
};
}
return;
}
}
else if (typeof json.choices[0].message === 'object') {
if (typeof json.choices[0].message.content === 'string' && json.choices[0].message.content.length > 0) {
for (let j = 0; j < json.choices[0].message.content.length; j++) {
const str = json.choices[0].message.content[j];
const choiceClone = structuredClone(json.choices[0]);
choiceClone.message.content = str;
const choices = [choiceClone];
yield {
data: { ...json, choices },
chunk: str,
};
}
return;
}
}
}
throw new Error('Unknown event data format');
}
/**
* Like the default one, but multiplies the events by the number of letters in the event data.
*/
export class SmoothEventSourceStream extends EventSourceStream {
constructor() {
super();
let lastStr = '';
const transformStream = new TransformStream({
async transform(chunk, controller) {
const event = chunk;
const data = event.data;
try {
const hasFocus = document.hasFocus();
if (data === '[DONE]') {
lastStr = '';
return controller.enqueue(event);
}
const json = JSON.parse(data);
if (!json) {
lastStr = '';
return controller.enqueue(event);
}
for await (const parsed of parseStreamData(json)) {
hasFocus && await delay(getDelay(lastStr));
controller.enqueue(new MessageEvent(event.type, { data: JSON.stringify(parsed.data) }));
lastStr = parsed.chunk;
hasFocus && await eventSource.emit(event_types.SMOOTH_STREAM_TOKEN_RECEIVED, parsed.chunk);
}
} catch (error) {
console.debug('Smooth Streaming parsing error', error);
controller.enqueue(event);
}
},
});
this.readable = this.readable.pipeThrough(transformStream);
}
}
export function getEventSourceStream() {
if (power_user.smooth_streaming) {
return new SmoothEventSourceStream();
}
return new EventSourceStream();
}
export default EventSourceStream;
|