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* Offline Store
*
* Manages offline state, message queue, and reconnection logic.
* Provides graceful degradation when backend is unavailable.
*/
import { create } from 'zustand';
import { persist } from 'zustand/middleware';
import { useConnectionStore, getConnectionState } from './connectionStore';
// === Types ===
export interface QueuedMessage {
id: string;
content: string;
agentId?: string;
sessionKey?: string;
timestamp: number;
retryCount: number;
lastError?: string;
status: 'pending' | 'sending' | 'failed' | 'sent';
}
export interface OfflineState {
isOffline: boolean;
isReconnecting: boolean;
reconnectAttempt: number;
nextReconnectDelay: number;
lastOnlineTime: number | null;
queuedMessages: QueuedMessage[];
maxRetryCount: number;
maxQueueSize: number;
}
export interface OfflineActions {
// State management
setOffline: (offline: boolean) => void;
setReconnecting: (reconnecting: boolean, attempt?: number) => void;
// Message queue operations
queueMessage: (content: string, agentId?: string, sessionKey?: string) => string;
updateMessageStatus: (id: string, status: QueuedMessage['status'], error?: string) => void;
removeMessage: (id: string) => void;
clearQueue: () => void;
retryAllMessages: () => Promise<void>;
// Reconnection
scheduleReconnect: () => void;
cancelReconnect: () => void;
attemptReconnect: () => Promise<boolean>;
// Getters
getPendingMessages: () => QueuedMessage[];
hasPendingMessages: () => boolean;
}
export type OfflineStore = OfflineState & OfflineActions;
// === Constants ===
const INITIAL_RECONNECT_DELAY = 1000; // 1 second
const MAX_RECONNECT_DELAY = 60000; // 60 seconds
const RECONNECT_BACKOFF_FACTOR = 1.5;
const MAX_RETRY_COUNT = 5;
const MAX_QUEUE_SIZE = 100;
// === Helper Functions ===
function calculateNextDelay(currentDelay: number): number {
return Math.min(
currentDelay * RECONNECT_BACKOFF_FACTOR,
MAX_RECONNECT_DELAY
);
}
function generateMessageId(): string {
return `queued_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`;
}
// === Store Implementation ===
let reconnectTimer: ReturnType<typeof setTimeout> | null = null;
let healthCheckInterval: ReturnType<typeof setInterval> | null = null;
export const useOfflineStore = create<OfflineStore>()(
persist(
(set, get) => ({
// === Initial State ===
isOffline: false,
isReconnecting: false,
reconnectAttempt: 0,
nextReconnectDelay: INITIAL_RECONNECT_DELAY,
lastOnlineTime: null,
queuedMessages: [],
maxRetryCount: MAX_RETRY_COUNT,
maxQueueSize: MAX_QUEUE_SIZE,
// === State Management ===
setOffline: (offline: boolean) => {
const wasOffline = get().isOffline;
set({
isOffline: offline,
lastOnlineTime: offline ? get().lastOnlineTime : Date.now(),
});
// Start reconnect process when going offline
if (offline && !wasOffline) {
get().scheduleReconnect();
} else if (!offline && wasOffline) {
// Back online - try to send queued messages
get().cancelReconnect();
set({ reconnectAttempt: 0, nextReconnectDelay: INITIAL_RECONNECT_DELAY });
get().retryAllMessages();
}
},
setReconnecting: (reconnecting: boolean, attempt?: number) => {
set({
isReconnecting: reconnecting,
reconnectAttempt: attempt ?? get().reconnectAttempt,
});
},
// === Message Queue Operations ===
queueMessage: (content: string, agentId?: string, sessionKey?: string) => {
const state = get();
// Check queue size limit
if (state.queuedMessages.length >= state.maxQueueSize) {
// Remove oldest pending message
const filtered = state.queuedMessages.filter((m, i) =>
i > 0 || m.status !== 'pending'
);
set({ queuedMessages: filtered });
}
const id = generateMessageId();
const message: QueuedMessage = {
id,
content,
agentId,
sessionKey,
timestamp: Date.now(),
retryCount: 0,
status: 'pending',
};
set((s) => ({
queuedMessages: [...s.queuedMessages, message],
}));
console.log(`[OfflineStore] Message queued: ${id}`);
return id;
},
updateMessageStatus: (id: string, status: QueuedMessage['status'], error?: string) => {
set((s) => ({
queuedMessages: s.queuedMessages.map((m) =>
m.id === id
? {
...m,
status,
lastError: error,
retryCount: status === 'failed' ? m.retryCount + 1 : m.retryCount,
}
: m
),
}));
},
removeMessage: (id: string) => {
set((s) => ({
queuedMessages: s.queuedMessages.filter((m) => m.id !== id),
}));
},
clearQueue: () => {
set({ queuedMessages: [] });
},
retryAllMessages: async () => {
const state = get();
const pending = state.queuedMessages.filter(
(m) => m.status === 'pending' || m.status === 'failed'
);
if (pending.length === 0) return;
// Check if connected
if (getConnectionState() !== 'connected') {
console.log('[OfflineStore] Not connected, cannot retry messages');
return;
}
console.log(`[OfflineStore] Retrying ${pending.length} queued messages`);
for (const msg of pending) {
if (msg.retryCount >= state.maxRetryCount) {
console.log(`[OfflineStore] Message ${msg.id} exceeded max retries`);
get().updateMessageStatus(msg.id, 'failed', 'Max retry count exceeded');
continue;
}
get().updateMessageStatus(msg.id, 'sending');
try {
// Use connected client from connectionStore (supports both GatewayClient and KernelClient)
const { getClient } = await import('./connectionStore');
const client = getClient();
await client.chat(msg.content, {
sessionKey: msg.sessionKey,
agentId: msg.agentId,
});
get().updateMessageStatus(msg.id, 'sent');
// Remove sent message after a short delay
setTimeout(() => get().removeMessage(msg.id), 1000);
console.log(`[OfflineStore] Message ${msg.id} sent successfully`);
} catch (err) {
const errorMessage = err instanceof Error ? err.message : 'Send failed';
get().updateMessageStatus(msg.id, 'failed', errorMessage);
console.warn(`[OfflineStore] Message ${msg.id} failed:`, errorMessage);
}
}
},
// === Reconnection ===
scheduleReconnect: () => {
const state = get();
// Don't schedule if already online
if (!state.isOffline) return;
// Cancel any existing timer
get().cancelReconnect();
const attempt = state.reconnectAttempt + 1;
const delay = state.nextReconnectDelay;
console.log(`[OfflineStore] Scheduling reconnect attempt ${attempt} in ${delay}ms`);
set({
isReconnecting: true,
reconnectAttempt: attempt,
nextReconnectDelay: calculateNextDelay(delay),
});
reconnectTimer = setTimeout(() => {
get().attemptReconnect();
}, delay);
},
cancelReconnect: () => {
if (reconnectTimer) {
clearTimeout(reconnectTimer);
reconnectTimer = null;
}
set({ isReconnecting: false });
},
attemptReconnect: async () => {
console.log('[OfflineStore] Attempting to reconnect...');
try {
// Try to connect via connection store
await useConnectionStore.getState().connect();
// Check if now connected
if (getConnectionState() === 'connected') {
console.log('[OfflineStore] Reconnection successful');
get().setOffline(false);
return true;
}
} catch (err) {
console.warn('[OfflineStore] Reconnection failed:', err);
}
// Still offline, schedule next attempt
get().setReconnecting(false);
get().scheduleReconnect();
return false;
},
// === Getters ===
getPendingMessages: () => {
return get().queuedMessages.filter(
(m) => m.status === 'pending' || m.status === 'failed'
);
},
hasPendingMessages: () => {
return get().queuedMessages.some(
(m) => m.status === 'pending' || m.status === 'failed'
);
},
}),
{
name: 'zclaw-offline-storage',
partialize: (state) => ({
queuedMessages: state.queuedMessages.filter(
(m) => m.status === 'pending' || m.status === 'failed'
),
lastOnlineTime: state.lastOnlineTime,
}),
}
)
);
// === Connection State Monitor ===
/**
* Start monitoring connection state and update offline store accordingly.
* Should be called once during app initialization.
*/
export function startOfflineMonitor(): () => void {
const checkConnection = () => {
const connectionState = getConnectionState();
const isOffline = connectionState !== 'connected';
if (isOffline !== useOfflineStore.getState().isOffline) {
useOfflineStore.getState().setOffline(isOffline);
}
};
// Initial check
checkConnection();
// Subscribe to connection state changes
const unsubscribe = useConnectionStore.subscribe((state, prevState) => {
if (state.connectionState !== prevState.connectionState) {
const isOffline = state.connectionState !== 'connected';
useOfflineStore.getState().setOffline(isOffline);
}
});
// Periodic health check (every 30 seconds)
healthCheckInterval = setInterval(checkConnection, 30000);
return () => {
unsubscribe();
if (healthCheckInterval) {
clearInterval(healthCheckInterval);
healthCheckInterval = null;
}
};
}
// === Exported Accessors ===
export const isOffline = () => useOfflineStore.getState().isOffline;
export const getQueuedMessages = () => useOfflineStore.getState().queuedMessages;
export const hasPendingMessages = () => useOfflineStore.getState().hasPendingMessages();
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