Update stream rendering frontend

This commit is contained in:
Samuele E. Locatelli
2025-08-21 15:27:04 +00:00
parent a92c3e6dee
commit c0da7f0398
7 changed files with 737 additions and 56 deletions
+580
View File
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"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/refractor/node_modules/comma-separated-tokens": {
"version": "1.0.8",
"resolved": "https://registry.npmjs.org/comma-separated-tokens/-/comma-separated-tokens-1.0.8.tgz",
"integrity": "sha512-GHuDRO12Sypu2cV70d1dkA2EUmXHgntrzbpvOB+Qy+49ypNfGgFQIC2fhhXbnyrJRynDCAARsT7Ou0M6hirpfw==",
"license": "MIT",
"funding": {
"type": "github",
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/refractor/node_modules/hast-util-parse-selector": {
"version": "2.2.5",
"resolved": "https://registry.npmjs.org/hast-util-parse-selector/-/hast-util-parse-selector-2.2.5.tgz",
"integrity": "sha512-7j6mrk/qqkSehsM92wQjdIgWM2/BW61u/53G6xmC8i1OmEdKLHbk419QKQUjz6LglWsfqoiHmyMRkP1BGjecNQ==",
"license": "MIT",
"funding": {
"type": "opencollective",
"url": "https://opencollective.com/unified"
}
},
"node_modules/refractor/node_modules/hastscript": {
"version": "6.0.0",
"resolved": "https://registry.npmjs.org/hastscript/-/hastscript-6.0.0.tgz",
"integrity": "sha512-nDM6bvd7lIqDUiYEiu5Sl/+6ReP0BMk/2f4U/Rooccxkj0P5nm+acM5PrGJ/t5I8qPGiqZSE6hVAwZEdZIvP4w==",
"license": "MIT",
"dependencies": {
"@types/hast": "^2.0.0",
"comma-separated-tokens": "^1.0.0",
"hast-util-parse-selector": "^2.0.0",
"property-information": "^5.0.0",
"space-separated-tokens": "^1.0.0"
},
"funding": {
"type": "opencollective",
"url": "https://opencollective.com/unified"
}
},
"node_modules/refractor/node_modules/is-alphabetical": {
"version": "1.0.4",
"resolved": "https://registry.npmjs.org/is-alphabetical/-/is-alphabetical-1.0.4.tgz",
"integrity": "sha512-DwzsA04LQ10FHTZuL0/grVDk4rFoVH1pjAToYwBrHSxcrBIGQuXrQMtD5U1b0U2XVgKZCTLLP8u2Qxqhy3l2Vg==",
"license": "MIT",
"funding": {
"type": "github",
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/refractor/node_modules/is-alphanumerical": {
"version": "1.0.4",
"resolved": "https://registry.npmjs.org/is-alphanumerical/-/is-alphanumerical-1.0.4.tgz",
"integrity": "sha512-UzoZUr+XfVz3t3v4KyGEniVL9BDRoQtY7tOyrRybkVNjDFWyo1yhXNGrrBTQxp3ib9BLAWs7k2YKBQsFRkZG9A==",
"license": "MIT",
"dependencies": {
"is-alphabetical": "^1.0.0",
"is-decimal": "^1.0.0"
},
"funding": {
"type": "github",
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/refractor/node_modules/is-decimal": {
"version": "1.0.4",
"resolved": "https://registry.npmjs.org/is-decimal/-/is-decimal-1.0.4.tgz",
"integrity": "sha512-RGdriMmQQvZ2aqaQq3awNA6dCGtKpiDFcOzrTWrDAT2MiWrKQVPmxLGHl7Y2nNu6led0kEyoX0enY0qXYsv9zw==",
"license": "MIT",
"funding": {
"type": "github",
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/refractor/node_modules/is-hexadecimal": {
"version": "1.0.4",
"resolved": "https://registry.npmjs.org/is-hexadecimal/-/is-hexadecimal-1.0.4.tgz",
"integrity": "sha512-gyPJuv83bHMpocVYoqof5VDiZveEoGoFL8m3BXNb2VW8Xs+rz9kqO8LOQ5DH6EsuvilT1ApazU0pyl+ytbPtlw==",
"license": "MIT",
"funding": {
"type": "github",
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/refractor/node_modules/parse-entities": {
"version": "2.0.0",
"resolved": "https://registry.npmjs.org/parse-entities/-/parse-entities-2.0.0.tgz",
"integrity": "sha512-kkywGpCcRYhqQIchaWqZ875wzpS/bMKhz5HnN3p7wveJTkTtyAB/AlnS0f8DFSqYW1T82t6yEAkEcB+A1I3MbQ==",
"license": "MIT",
"dependencies": {
"character-entities": "^1.0.0",
"character-entities-legacy": "^1.0.0",
"character-reference-invalid": "^1.0.0",
"is-alphanumerical": "^1.0.0",
"is-decimal": "^1.0.0",
"is-hexadecimal": "^1.0.0"
},
"funding": {
"type": "github",
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/refractor/node_modules/prismjs": {
"version": "1.27.0",
"resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.27.0.tgz",
"integrity": "sha512-t13BGPUlFDR7wRB5kQDG4jjl7XeuH6jbJGt11JHPL96qwsEHNX2+68tFXqc1/k+/jALsbSWJKUOT/hcYAZ5LkA==",
"license": "MIT",
"engines": {
"node": ">=6"
}
},
"node_modules/refractor/node_modules/property-information": {
"version": "5.6.0",
"resolved": "https://registry.npmjs.org/property-information/-/property-information-5.6.0.tgz",
"integrity": "sha512-YUHSPk+A30YPv+0Qf8i9Mbfe/C0hdPXk1s1jPVToV8pk8BQtpw10ct89Eo7OWkutrwqvT0eicAxlOg3dOAu8JA==",
"license": "MIT",
"dependencies": {
"xtend": "^4.0.0"
},
"funding": {
"type": "github",
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/refractor/node_modules/space-separated-tokens": {
"version": "1.1.5",
"resolved": "https://registry.npmjs.org/space-separated-tokens/-/space-separated-tokens-1.1.5.tgz",
"integrity": "sha512-q/JSVd1Lptzhf5bkYm4ob4iWPjx0KiRe3sRFBNrVqbJkFaBm5vbbowy1mymoPNLRa52+oadOhJ+K49wsSeSjTA==",
"license": "MIT",
"funding": {
"type": "github",
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/rehype-katex": {
"version": "7.0.1",
"resolved": "https://registry.npmjs.org/rehype-katex/-/rehype-katex-7.0.1.tgz",
@@ -1545,6 +2083,24 @@
"url": "https://opencollective.com/unified"
}
},
"node_modules/remark-gfm": {
"version": "4.0.1",
"resolved": "https://registry.npmjs.org/remark-gfm/-/remark-gfm-4.0.1.tgz",
"integrity": "sha512-1quofZ2RQ9EWdeN34S79+KExV1764+wCUGop5CPL1WGdD0ocPpu91lzPGbwWMECpEpd42kJGQwzRfyov9j4yNg==",
"license": "MIT",
"dependencies": {
"@types/mdast": "^4.0.0",
"mdast-util-gfm": "^3.0.0",
"micromark-extension-gfm": "^3.0.0",
"remark-parse": "^11.0.0",
"remark-stringify": "^11.0.0",
"unified": "^11.0.0"
},
"funding": {
"type": "opencollective",
"url": "https://opencollective.com/unified"
}
},
"node_modules/remark-math": {
"version": "6.0.0",
"resolved": "https://registry.npmjs.org/remark-math/-/remark-math-6.0.0.tgz",
@@ -1594,6 +2150,21 @@
"url": "https://opencollective.com/unified"
}
},
"node_modules/remark-stringify": {
"version": "11.0.0",
"resolved": "https://registry.npmjs.org/remark-stringify/-/remark-stringify-11.0.0.tgz",
"integrity": "sha512-1OSmLd3awB/t8qdoEOMazZkNsfVTeY4fTsgzcQFdXNq8ToTN4ZGwrMnlda4K6smTFKD+GRV6O48i6Z4iKgPPpw==",
"license": "MIT",
"dependencies": {
"@types/mdast": "^4.0.0",
"mdast-util-to-markdown": "^2.0.0",
"unified": "^11.0.0"
},
"funding": {
"type": "opencollective",
"url": "https://opencollective.com/unified"
}
},
"node_modules/rollup": {
"version": "3.29.5",
"license": "MIT",
@@ -1942,6 +2513,15 @@
"url": "https://github.com/sponsors/wooorm"
}
},
"node_modules/xtend": {
"version": "4.0.2",
"resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
"integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
"license": "MIT",
"engines": {
"node": ">=0.4"
}
},
"node_modules/zwitch": {
"version": "2.0.4",
"resolved": "https://registry.npmjs.org/zwitch/-/zwitch-2.0.4.tgz",
+2
View File
@@ -6,7 +6,9 @@
"react": "^18.3.1",
"react-dom": "^18.3.1",
"react-markdown": "^10.1.0",
"react-syntax-highlighter": "^15.6.1",
"rehype-katex": "^7.0.1",
"remark-gfm": "^4.0.1",
"remark-math": "^6.0.0",
"vite": "^4.0.0"
},
+5
View File
@@ -18,6 +18,7 @@ body, html {
overflow-y: auto;
padding: 1rem;
background-color: #f8f9fa; /* Bootstrap light gray */
overflow-anchor: none; /* prevent anchor jumps */
}
/* Wider bubbles — use Bootstrap breakpoints for responsiveness */
@@ -30,6 +31,10 @@ body, html {
word-wrap: break-word;
}
.message:last-child {
overflow-anchor: auto; /* anchor here */
}
@media (min-width: 768px) {
.message {
max-width: 75%; /* keep some margin on larger screens */
+57 -47
View File
@@ -3,74 +3,81 @@ import React, { useState, useRef, useEffect } from 'react';
import ReactMarkdown from 'react-markdown';
import remarkMath from 'remark-math';
import rehypeKatex from 'rehype-katex';
import MessageContent from './MessageContent';
import { useStreamBuffer } from './hooks/useStreamBuffer'
import './App.css';
import 'katex/dist/katex.min.css';
function App() {
const [messages, setMessages] = useState([]);
const [input, setInput] = useState("");
const [loading, setLoading] = useState(false);
const messagesEndRef = useRef(null);
useEffect(() => {
messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
}, [messages]);
const { buffered, pushChunk, reset } = useStreamBuffer(80);
const sendMessage = async () => {
if (!input.trim() || loading) return;
const userMessage = { role: "user", content: input };
const userId = "user1";
// Calculate where the assistant placeholder will land
const startIndex = messages.length;
const assistantIndex = startIndex + 1;
// Optimistic UI: user + empty assistant
setMessages(prev => [...prev, userMessage, { role: "assistant", content: "" }]);
setInput("");
setLoading(true);
const controller = new AbortController();
const signal = controller.signal;
reset(); // clear the buffer for the new response
try {
const res = await fetch("/chat-stream", {
method: "POST",
headers: { "Content-Type": "application/json", "Accept": "text/event-stream" },
body: JSON.stringify({ user_id: userId, message: userMessage.content }),
signal
body: JSON.stringify({ user_id: userId, message: userMessage.content })
});
if (!res.ok) {
// Fallback: non-streaming endpoint if server doesnt stream
// Non-streaming fallback
if (!res.ok || !res.body) {
const json = await res.json().catch(() => null);
const text = json?.response ?? "Error: streaming not available.";
setMessages(prev => {
const next = [...prev];
next[next.length - 1] = { role: "assistant", content: text };
next[assistantIndex] = { role: "assistant", content: text };
return next;
});
setLoading(false);
return;
}
const reader = res.body.getReader();
const decoder = new TextDecoder("utf-8");
let buffer = "";
let gotFirstToken = false;
let acc = ""; // final committed text
let sseBuffer = ""; // raw SSE buffer
while (true) {
const { value, done } = await reader.read();
if (done) break;
buffer += decoder.decode(value, { stream: true });
sseBuffer += decoder.decode(value, { stream: true });
// Split on SSE event boundary
const events = buffer.split("\n\n");
buffer = events.pop() || "";
// Split on SSE event boundaries
const events = sseBuffer.split("\n\n");
sseBuffer = events.pop() || "";
for (const evt of events) {
// Each event may contain multiple lines; process data lines
const lines = evt.split("\n").map(l => l.trim()).filter(Boolean);
for (const line of lines) {
if (!line.startsWith("data:")) continue;
const data = line.slice(5).trim();
if (data === "[DONE]") {
// Stream end
// Commit final text and finish
setMessages(prev => {
const next = [...prev];
next[assistantIndex] = { role: "assistant", content: acc };
return next;
});
setLoading(false);
return;
}
@@ -80,33 +87,38 @@ function App() {
const delta = choice.delta ?? {};
const piece = delta.content ?? choice.text ?? "";
if (piece) {
if (!gotFirstToken) {
gotFirstToken = true;
}
setMessages(prev => {
const next = [...prev];
const lastIndex = next.length - 1;
const last = next[lastIndex];
next[lastIndex] = { ...last, content: (last.content || "") + piece };
return next;
});
acc += piece; // reliable final copy
pushChunk(piece); // smooth UI copy
}
} catch {
// Non-JSON control lines (ignore)
// ignore non-JSON control lines
}
}
}
}
// Stream ended without an explicit [DONE]
setMessages(prev => {
const next = [...prev];
next[assistantIndex] = { role: "assistant", content: acc };
return next;
});
} catch (err) {
setMessages(prev => {
const next = [...prev];
next[next.length - 1] = { role: "assistant", content: `Error: ${String(err)}` };
next[assistantIndex] = { role: "assistant", content: `Error: ${String(err)}` };
return next;
});
} finally {
setLoading(false);
}
};
useEffect(() => {
if (loading) {
messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
}
}, [buffered, loading]);
return (
<div className="chat-container d-flex flex-column vh-100">
@@ -117,18 +129,18 @@ function App() {
</header>
<div className="chat-box container-fluid py-2 flex-grow-1 overflow-auto">
{messages.map((msg, i) => (
<div className="row mb-2" key={i}>
<div className={`col-12 d-flex ${msg.role === "user" ? "justify-content-end" : "justify-content-start"}`} >
<div className={`p-2 rounded-3 shadow-sm ${
msg.role === "user" ? "bg-primary bg-opacity-75 text-white" : "bg-light border text-dark"
}`}
style={{ width: "95%" }} >
<ReactMarkdown remarkPlugins={[remarkMath]} rehypePlugins={[rehypeKatex]}>{msg.content}</ReactMarkdown>
</div>
</div>
</div>
))}
{messages.map((msg, i) => {
const isLastAssistant = i === messages.length - 1 && msg.role === "assistant" && loading;
return (
<div className="row mb-2" key={i}>
<div className={`col-12 d-flex ${msg.role === "user" ? "justify-content-end" : "justify-content-start"}`}>
<div className={`p-2 rounded-3 shadow-sm ${ msg.role === "user" ? "bg-primary bg-opacity-75 text-white" : "bg-light border text-dark" }`} style={{ width: "95%" }} >
<MessageContent content={isLastAssistant ? buffered : msg.content} />
</div>
</div>
</div>
);
})}
{loading && (
<div className="row text-muted ps-3">
@@ -163,5 +175,3 @@ function App() {
}
export default App;
+27
View File
@@ -0,0 +1,27 @@
/* MessageContent.css */
.table {
width: auto;
border-collapse: collapse;
}
.table th,
.table td {
border: 1px solid #dee2e6;
padding: 0.25rem 0.5rem;
vertical-align: top;
}
code {
white-space: pre-wrap;
word-break: break-word;
}
.md-pre-wrapper {
min-height: 5rem; /* adjust to taste */
}
.md-pre-wrapper pre,
.md-pre-wrapper > div { /* syntax highlighter wrapper */
margin: 0;
overflow: auto;
}
+41 -9
View File
@@ -1,36 +1,68 @@
// MessageContent.jsx
import React, { useCallback } from 'react';
import ReactMarkdown from 'react-markdown';
import remarkMath from 'remark-math';
import remarkGfm from 'remark-gfm';
import rehypeKatex from 'rehype-katex';
import 'katex/dist/katex.min.css';
import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter';
import { oneDark } from 'react-syntax-highlighter/dist/esm/styles/prism';
import './MessageContent.css';
export default function MessageContent({ content }) {
const handleCopy = useCallback((text) => {
navigator.clipboard.writeText(text);
const handleCopy = useCallback(async (text) => {
try {
await navigator.clipboard.writeText(text);
} catch {
/* you could add a toast here if desired */
}
}, []);
return (
<ReactMarkdown
remarkPlugins={[remarkMath]}
remarkPlugins={[remarkMath, remarkGfm]}
rehypePlugins={[rehypeKatex]}
components={{
table: (props) => <table className="table table-bordered table-sm" {...props} />,
thead: (props) => <thead className="table-light" {...props} />,
code({ inline, className, children, ...props }) {
const codeText = String(children).replace(/\n$/, '');
if (inline) {
return <code className={className} {...props}>{children}</code>;
const match = /language-(\w+)/.exec(className || '');
const isMultiLine = codeText.includes('\n');
if (inline || !isMultiLine) {
// Inline or single-line — render plainly
return (
<code className={className} {...props}>
{children}
</code>
);
}
// Multi-line fenced code block → highlight + copy button
return (
<div className="position-relative">
<pre className={className} {...props}>{children}</pre>
<div className="position-relative md-pre-wrapper">
<SyntaxHighlighter
style={oneDark}
language={match ? match[1] : null}
PreTag="div"
customStyle={{ margin: 0, borderRadius: '0.25rem', minHeight: '5rem' }}
>
{codeText || ' '} {/* keep at least a space to hold height */}
</SyntaxHighlighter>
<button
className="btn btn-sm btn-outline-secondary position-absolute top-0 end-0 m-1"
type="button"
className="btn btn-sm btn-outline-secondary position-absolute top-0 end-0 m-1 d-flex align-items-center gap-1"
onClick={() => handleCopy(codeText)}
>
<span role="img" aria-label="Copy">
📋
</span>
Copy
</button>
</div>
);
}
},
}}
>
{content}
+25
View File
@@ -0,0 +1,25 @@
// src/hooks/useStreamBuffer.js
import { useState, useRef } from 'react';
export function useStreamBuffer(updateInterval = 80) {
const [buffered, setBuffered] = useState('');
const bufferRef = useRef('');
const lastUpdateRef = useRef(0);
const pushChunk = (chunk) => {
bufferRef.current += chunk;
const now = performance.now();
if (now - lastUpdateRef.current > updateInterval) {
setBuffered(bufferRef.current);
lastUpdateRef.current = now;
}
};
const reset = () => {
bufferRef.current = '';
setBuffered('');
lastUpdateRef.current = 0;
};
return { buffered, pushChunk, reset };
}