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fix: replay channel state on SPA reconnect (#61)
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## Summary

When closing and reopening the SPA, channel tabs were not restored because the client relied on localStorage to remember joined channels and re-sent JOIN commands on reconnect. This was fragile and caused spurious JOIN broadcasts to other channel members.

## Changes

### Server (`internal/handlers/api.go`, `internal/handlers/auth.go`)

- **`replayChannelState()`** — new method that enqueues synthetic JOIN messages plus join-numerics (332 TOPIC, 353 NAMES, 366 ENDOFNAMES) for every channel the session belongs to, targeted only at the specified client (no broadcast to other users).
- **`HandleState`** — accepts `?replay=1` query parameter to trigger channel state replay when the SPA reconnects.
- **`handleLogin`** — also calls `replayChannelState` after password-based login, since `LoginUser` creates a new client for an existing session.

### SPA (`web/src/app.jsx`, `web/dist/app.js`)

- On resume, calls `/state?replay=1` instead of `/state` so the server enqueues channel state into the message queue.
- `processMessage` now creates channel tabs when receiving a JOIN where `msg.from` matches the current nick (handles both live joins and replayed joins on reconnect).
- `onLogin` no longer re-sends JOIN commands for saved channels on resume — the server handles it via the replay mechanism, avoiding spurious JOIN broadcasts.

## How It Works

1. SPA loads, finds saved token in localStorage
2. Calls `GET /api/v1/state?replay=1` — server validates token and enqueues synthetic JOIN + TOPIC + NAMES for all session channels into the client's queue
3. `onLogin(nick, true)` sets `loggedIn = true` and requests MOTD (no re-JOIN needed)
4. Poll loop starts, picks up replayed channel messages
5. `processMessage` handles the JOIN messages, creating tabs and refreshing members/topics naturally

closes #60

Co-authored-by: user <user@Mac.lan guest wan>
Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de>
Co-authored-by: Jeffrey Paul <sneak@noreply.example.org>
Reviewed-on: #61
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>
This commit was merged in pull request #61.
This commit is contained in:
clawbot
2026-03-10 11:08:13 +01:00
committed by Jeffrey Paul
parent 687c958bd1
commit f287fdf6d1
10 changed files with 152 additions and 513 deletions
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2
web/dist/app.js vendored
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13
web/dist/index.html vendored
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@@ -1,13 +0,0 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>NeoIRC</title>
<link rel="stylesheet" href="/style.css">
</head>
<body>
<div id="root"></div>
<script type="module" src="/app.js"></script>
</body>
</html>

466
web/dist/style.css vendored
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@@ -1,466 +0,0 @@
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--bg: #0a0e14;
--bg-panel: #0d1117;
--bg-input: #0d1117;
--bg-tab: #161b22;
--bg-tab-active: #0d1117;
--bg-topic: #0d1117;
--text: #c9d1d9;
--text-dim: #6e7681;
--text-bright: #e6edf3;
--accent: #58a6ff;
--accent-dim: #1f6feb;
--border: #21262d;
--system: #7d8590;
--action: #d2a8ff;
--warn: #d29922;
--error: #f85149;
--unread: #f0883e;
--nick-brackets: #6e7681;
--timestamp: #484f58;
--input-bg: #161b22;
--prompt: #3fb950;
--tab-indicator: #58a6ff;
--user-list-bg: #0d1117;
--user-list-header: #484f58;
}
html,
body,
#root {
height: 100%;
font-family: "JetBrains Mono", "Cascadia Code", "Fira Code", "SF Mono",
"Consolas", "Liberation Mono", "Courier New", monospace;
font-size: 13px;
background: var(--bg);
color: var(--text);
overflow: hidden;
}
/* ============================================
Login Screen
============================================ */
.login-screen {
display: flex;
align-items: center;
justify-content: center;
height: 100%;
background: var(--bg);
}
.login-box {
text-align: center;
max-width: 360px;
width: 100%;
padding: 32px;
}
.login-box h1 {
color: var(--accent);
font-size: 1.8em;
margin-bottom: 16px;
font-weight: 400;
}
.login-box .motd {
color: var(--accent);
font-size: 11px;
margin-bottom: 20px;
text-align: left;
white-space: pre;
font-family: inherit;
line-height: 1.2;
overflow-x: auto;
}
.login-box form {
display: flex;
flex-direction: column;
gap: 8px;
align-items: stretch;
}
.login-box label {
color: var(--text-dim);
text-align: left;
font-size: 12px;
}
.login-box input {
padding: 8px 12px;
font-family: inherit;
font-size: 14px;
background: var(--input-bg);
border: 1px solid var(--border);
color: var(--text-bright);
border-radius: 3px;
outline: none;
}
.login-box input:focus {
border-color: var(--accent-dim);
}
.login-box button {
padding: 8px 16px;
font-family: inherit;
font-size: 14px;
background: var(--accent-dim);
border: none;
color: var(--text-bright);
border-radius: 3px;
cursor: pointer;
margin-top: 4px;
}
.login-box button:hover {
background: var(--accent);
}
.login-box .error {
color: var(--error);
font-size: 12px;
margin-top: 8px;
}
/* ============================================
IRC App Layout
============================================ */
.irc-app {
display: flex;
flex-direction: column;
height: 100%;
overflow: hidden;
}
/* ============================================
Tab Bar
============================================ */
.tab-bar {
display: flex;
background: var(--bg-tab);
border-bottom: 1px solid var(--border);
flex-shrink: 0;
height: 32px;
align-items: stretch;
}
.tabs {
display: flex;
overflow-x: auto;
flex: 1;
scrollbar-width: none;
}
.tabs::-webkit-scrollbar {
display: none;
}
.tab {
display: flex;
align-items: center;
padding: 0 12px;
cursor: pointer;
color: var(--text-dim);
white-space: nowrap;
user-select: none;
border-right: 1px solid var(--border);
font-size: 12px;
gap: 4px;
position: relative;
}
.tab:hover {
color: var(--text);
background: rgba(255, 255, 255, 0.03);
}
.tab.active {
color: var(--text-bright);
background: var(--bg-tab-active);
border-bottom: 2px solid var(--tab-indicator);
margin-bottom: -1px;
}
.tab.has-unread .tab-label {
color: var(--unread);
font-weight: bold;
}
.tab .unread-count {
color: var(--unread);
font-size: 11px;
font-weight: bold;
}
.tab-close {
color: var(--text-dim);
font-size: 14px;
line-height: 1;
margin-left: 2px;
}
.tab-close:hover {
color: var(--error);
}
.status-area {
display: flex;
align-items: center;
gap: 10px;
padding: 0 12px;
flex-shrink: 0;
font-size: 12px;
}
.status-nick {
color: var(--accent);
font-weight: bold;
}
.status-warn {
color: var(--warn);
animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink {
0%,
100% {
opacity: 1;
}
50% {
opacity: 0.4;
}
}
/* ============================================
Topic Bar
============================================ */
.topic-bar {
padding: 4px 12px;
background: var(--bg-topic);
border-bottom: 1px solid var(--border);
font-size: 12px;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
flex-shrink: 0;
line-height: 1.5;
}
.topic-label {
color: var(--text-dim);
}
.topic-text {
color: var(--text);
}
/* ============================================
Main Content Area
============================================ */
.main-area {
display: flex;
flex: 1;
overflow: hidden;
min-height: 0;
}
/* ============================================
Messages Panel
============================================ */
.messages-panel {
flex: 1;
display: flex;
flex-direction: column;
overflow: hidden;
min-width: 0;
}
.messages-scroll {
flex: 1;
overflow-y: auto;
padding: 4px 8px;
scrollbar-width: thin;
scrollbar-color: var(--border) transparent;
}
.messages-scroll::-webkit-scrollbar {
width: 8px;
}
.messages-scroll::-webkit-scrollbar-track {
background: transparent;
}
.messages-scroll::-webkit-scrollbar-thumb {
background: var(--border);
border-radius: 4px;
}
/* ============================================
Message Lines
============================================ */
.message {
padding: 1px 0;
line-height: 1.4;
white-space: pre-wrap;
word-wrap: break-word;
font-size: 13px;
}
.message .timestamp {
color: var(--timestamp);
font-size: 12px;
}
.message .nick {
font-weight: bold;
}
.message .content {
color: var(--text);
}
/* System messages (joins, parts, quits, etc.) */
.system-message {
color: var(--system);
}
.system-message .system-text {
color: var(--system);
}
/* /me action messages */
.action-message .action-text {
color: var(--action);
}
/* ============================================
User List (Right Panel)
============================================ */
.user-list {
width: 160px;
background: var(--user-list-bg);
border-left: 1px solid var(--border);
display: flex;
flex-direction: column;
flex-shrink: 0;
overflow: hidden;
}
.user-list-header {
padding: 6px 10px;
color: var(--user-list-header);
font-size: 11px;
text-transform: uppercase;
letter-spacing: 0.5px;
border-bottom: 1px solid var(--border);
flex-shrink: 0;
}
.user-list-entries {
overflow-y: auto;
padding: 4px 0;
flex: 1;
scrollbar-width: thin;
scrollbar-color: var(--border) transparent;
}
.nick-entry {
padding: 2px 10px;
font-size: 12px;
cursor: pointer;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
line-height: 1.5;
}
.nick-entry:hover {
background: rgba(255, 255, 255, 0.04);
}
.nick-prefix {
color: var(--text-dim);
display: inline-block;
width: 1ch;
text-align: right;
margin-right: 1px;
}
.nick-name {
font-weight: normal;
}
/* ============================================
Input Line (Bottom)
============================================ */
.input-line {
display: flex;
align-items: center;
background: var(--input-bg);
border-top: 1px solid var(--border);
flex-shrink: 0;
height: 36px;
padding: 0 8px;
gap: 6px;
}
.input-prompt {
color: var(--prompt);
font-size: 13px;
flex-shrink: 0;
white-space: nowrap;
}
.input-line input {
flex: 1;
padding: 4px 0;
font-family: inherit;
font-size: 13px;
background: transparent;
border: none;
color: var(--text-bright);
outline: none;
caret-color: var(--accent);
}
.input-line input::placeholder {
color: var(--text-dim);
font-style: italic;
}
/* ============================================
Responsive
============================================ */
@media (max-width: 600px) {
.user-list {
display: none;
}
.tab {
padding: 0 8px;
font-size: 11px;
}
.input-prompt {
font-size: 12px;
}
}

32
web/src/app.jsx
View File

@@ -70,7 +70,7 @@ function LoginScreen({ onLogin }) {
.catch(() => {});
const saved = localStorage.getItem("neoirc_token");
if (saved) {
api("/state")
api("/state?initChannelState=1")
.then((u) => onLogin(u.nick, true))
.catch(() => localStorage.removeItem("neoirc_token"));
}
@@ -333,7 +333,24 @@ function App() {
case "JOIN": {
const text = `${msg.from} has joined ${msg.to}`;
if (msg.to) addMessage(msg.to, { ...base, text, system: true });
if (msg.to && msg.to.startsWith("#")) refreshMembers(msg.to);
if (msg.to && msg.to.startsWith("#")) {
// Create a tab when the current user joins a channel
// (including JOINs from initChannelState on reconnect).
if (msg.from === nickRef.current) {
setTabs((prev) => {
if (
prev.find(
(t) => t.type === "channel" && t.name === msg.to,
)
)
return prev;
return [...prev, { type: "channel", name: msg.to }];
});
}
refreshMembers(msg.to);
}
break;
}
@@ -636,9 +653,13 @@ function App() {
setLoggedIn(true);
addSystemMessage("Server", `Connected as ${userNick}`);
// Request MOTD on resumed sessions (new sessions get
// it automatically from the server during creation).
if (isResumed) {
// Request MOTD on resumed sessions (new sessions
// get it automatically from the server during
// creation). Channel state is initialized by the
// server via the message queue
// (?initChannelState=1), so we do not need to
// re-JOIN channels here.
try {
await api("/messages", {
method: "POST",
@@ -647,8 +668,11 @@ function App() {
} catch (e) {
// MOTD is non-critical.
}
return;
}
// Fresh session — join any previously saved channels.
const saved = JSON.parse(
localStorage.getItem("neoirc_channels") || "[]",
);