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<script lang="ts">
import ChatWindow from "$lib/components/chat/ChatWindow.svelte";
import { pendingMessage } from "$lib/stores/pendingMessage";
import { pendingMessageIdToRetry } from "$lib/stores/pendingMessageIdToRetry";
import { onMount } from "svelte";
import { page } from "$app/stores";
import { textGenerationStream, type Options } from "@huggingface/inference";
import { invalidate } from "$app/navigation";
import { base } from "$app/paths";
import { shareConversation } from "$lib/shareConversation";
import { UrlDependency } from "$lib/types/UrlDependency";
import { ERROR_MESSAGES, error } from "$lib/stores/errors";
import { randomUUID } from "$lib/utils/randomUuid";
import { findCurrentModel } from "$lib/utils/models";
import { webSearchParameters } from "$lib/stores/webSearchParameters";
import type { WebSearchMessage } from "$lib/types/WebSearch";
import type { Message } from "$lib/types/Message";
import { PUBLIC_APP_DISCLAIMER } from "$env/static/public";
export let data;
let messages = data.messages;
let lastLoadedMessages = data.messages;
let isAborted = false;
let webSearchMessages: WebSearchMessage[] = [];
// Since we modify the messages array locally, we don't want to reset it if an old version is passed
$: if (data.messages !== lastLoadedMessages) {
messages = data.messages;
lastLoadedMessages = data.messages;
}
let loading = false;
let pending = false;
let loginRequired = false;
async function getTextGenerationStream(
inputs: string,
messageId: string,
isRetry = false,
webSearchId?: string
) {
let conversationId = $page.params.id;
const responseId = randomUUID();
const response = textGenerationStream(
{
model: $page.url.href,
inputs,
parameters: {
...data.models.find((m) => m.id === data.model)?.parameters,
return_full_text: false,
},
},
{
id: messageId,
response_id: responseId,
is_retry: isRetry,
use_cache: false,
web_search_id: webSearchId,
} as Options
);
for await (const output of response) {
pending = false;
if (!output) {
break;
}
if (conversationId !== $page.params.id) {
fetch(`${base}/conversation/${conversationId}/stop-generating`, {
method: "POST",
}).catch(console.error);
break;
}
if (isAborted) {
isAborted = false;
fetch(`${base}/conversation/${conversationId}/stop-generating`, {
method: "POST",
}).catch(console.error);
break;
}
// final message
if (output.generated_text) {
const lastMessage = messages[messages.length - 1];
if (lastMessage) {
lastMessage.content = output.generated_text;
lastMessage.webSearchId = webSearchId;
messages = [...messages];
}
break;
}
if (!output.token.special) {
const lastMessage = messages[messages.length - 1];
if (lastMessage?.from !== "assistant") {
// First token has a space at the beginning, trim it
messages = [
...messages,
// id doesn't match the backend id but it's not important for assistant messages
{ from: "assistant", content: output.token.text.trimStart(), id: responseId },
];
} else {
lastMessage.content += output.token.text;
messages = [...messages];
}
}
}
}
async function summarizeTitle(id: string) {
await fetch(`${base}/conversation/${id}/summarize`, {
method: "POST",
});
}
async function writeMessage(message: string, messageId = randomUUID()) {
if (!message.trim()) return;
try {
isAborted = false;
loading = true;
pending = true;
let retryMessageIndex = messages.findIndex((msg) => msg.id === messageId);
const isRetry = retryMessageIndex !== -1;
if (!isRetry) {
retryMessageIndex = messages.length;
}
messages = [
...messages.slice(0, retryMessageIndex),
{ from: "user", content: message, id: messageId },
];
let searchResponseId: string | null = "";
if ($webSearchParameters.useSearch) {
webSearchMessages = [];
const res = await fetch(
`${base}/conversation/${$page.params.id}/web-search?` +
new URLSearchParams({ prompt: message }),
{
method: "GET",
}
);
// required bc linting doesn't see TextDecoderStream for some reason?
// eslint-disable-next-line no-undef
const encoder = new TextDecoderStream();
const reader = res?.body?.pipeThrough(encoder).getReader();
while (searchResponseId === "") {
await new Promise((r) => setTimeout(r, 25));
if (isAborted) {
reader?.cancel();
return;
}
reader
?.read()
.then(async ({ done, value }) => {
if (done) {
reader.cancel();
return;
}
try {
webSearchMessages = (JSON.parse(value) as { messages: WebSearchMessage[] })
.messages;
} catch (parseError) {
// in case of parsing error we wait for the next message
return;
}
const lastSearchMessage = webSearchMessages[webSearchMessages.length - 1];
if (lastSearchMessage.type === "result") {
searchResponseId = lastSearchMessage.id;
reader.cancel();
data.searches[searchResponseId] = [...webSearchMessages];
return;
}
})
.catch(() => {
searchResponseId = null;
});
}
}
await getTextGenerationStream(message, messageId, isRetry, searchResponseId ?? undefined);
webSearchMessages = [];
if (messages.filter((m) => m.from === "user").length === 1) {
summarizeTitle($page.params.id)
.then(() => invalidate(UrlDependency.ConversationList))
.catch(console.error);
} else {
await invalidate(UrlDependency.ConversationList);
}
} catch (err) {
if (err instanceof Error && err.message.includes("overloaded")) {
$error = "Too much traffic, please try again.";
} else if (err instanceof Error && err.message.includes("429")) {
$error = ERROR_MESSAGES.rateLimited;
} else if (err instanceof Error) {
$error = err.message;
} else {
$error = ERROR_MESSAGES.default;
}
console.error(err);
} finally {
loading = false;
pending = false;
}
}
async function voteMessage(score: Message["score"], messageId: string) {
let conversationId = $page.params.id;
let oldScore: Message["score"] | undefined;
// optimistic update to avoid waiting for the server
messages = messages.map((message) => {
if (message.id === messageId) {
oldScore = message.score;
return { ...message, score: score };
}
return message;
});
try {
await fetch(`${base}/conversation/${conversationId}/message/${messageId}/vote`, {
method: "POST",
body: JSON.stringify({ score }),
});
} catch {
// revert score on any error
messages = messages.map((message) => {
return message.id !== messageId ? message : { ...message, score: oldScore };
});
}
}
onMount(async () => {
if ($pendingMessage) {
const val = $pendingMessage;
const messageId = $pendingMessageIdToRetry || undefined;
$pendingMessage = "";
$pendingMessageIdToRetry = null;
writeMessage(val, messageId);
}
});
$: $page.params.id, (isAborted = true);
$: title = data.conversations.find((conv) => conv.id === $page.params.id)?.title ?? data.title;
$: loginRequired =
(data.requiresLogin
? !data.user
: !data.settings.ethicsModalAcceptedAt && !!PUBLIC_APP_DISCLAIMER) &&
messages.length >= data.messagesBeforeLogin;
</script>
<svelte:head>
<title>{title}</title>
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.css"
integrity="sha384-GvrOXuhMATgEsSwCs4smul74iXGOixntILdUW9XmUC6+HX0sLNAK3q71HotJqlAn"
crossorigin="anonymous"
/>
</svelte:head>
<ChatWindow
{loading}
{pending}
{messages}
bind:webSearchMessages
searches={{ ...data.searches }}
on:message={(event) => writeMessage(event.detail)}
on:retry={(event) => writeMessage(event.detail.content, event.detail.id)}
on:vote={(event) => voteMessage(event.detail.score, event.detail.id)}
on:share={() => shareConversation($page.params.id, data.title)}
on:stop={() => (isAborted = true)}
models={data.models}
currentModel={findCurrentModel([...data.models, ...data.oldModels], data.model)}
settings={data.settings}
{loginRequired}
/>
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