feat: LangChain auto-instrumentation + dashboard UI
- LangChain: AgentLensCallbackHandler with auto-span creation for LLM calls, tool calls, chains, and agent decision logging - Dashboard: trace list with search, status filters, pagination - Dashboard: trace detail with Decision/Span/Event tabs - Dashboard: sidebar layout, responsive design, dark theme
This commit is contained in:
Vectry
155
apps/web/src/app/dashboard/layout.tsx
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155
apps/web/src/app/dashboard/layout.tsx
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"use client";
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import { ReactNode, useState } from "react";
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import Link from "next/link";
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import { usePathname } from "next/navigation";
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import {
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Activity,
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GitBranch,
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Settings,
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Menu,
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X,
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ChevronRight,
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} from "lucide-react";
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import { cn } from "@/lib/utils";
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interface NavItem {
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href: string;
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label: string;
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icon: React.ComponentType<{ className?: string }>;
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comingSoon?: boolean;
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}
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const navItems: NavItem[] = [
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{ href: "/dashboard", label: "Traces", icon: Activity },
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{ href: "/dashboard/decisions", label: "Decisions", icon: GitBranch, comingSoon: true },
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{ href: "/dashboard/settings", label: "Settings", icon: Settings, comingSoon: true },
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];
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function Sidebar({ onNavigate }: { onNavigate?: () => void }) {
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const pathname = usePathname();
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return (
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<div className="flex flex-col h-full bg-neutral-900 border-r border-neutral-800">
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{/* Logo */}
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<div className="p-6 border-b border-neutral-800">
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<Link
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href="/"
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className="flex items-center gap-3 group"
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onClick={onNavigate}
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>
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<div className="w-10 h-10 rounded-xl bg-gradient-to-br from-emerald-400 to-emerald-600 flex items-center justify-center shadow-lg shadow-emerald-500/20 group-hover:shadow-emerald-500/30 transition-shadow">
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<Activity className="w-5 h-5 text-white" />
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</div>
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<div className="flex flex-col">
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<span className="font-bold text-lg text-neutral-100">AgentLens</span>
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<span className="text-xs text-neutral-500">Dashboard</span>
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</div>
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</Link>
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</div>
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{/* Navigation */}
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<nav className="flex-1 p-4 space-y-1">
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{navItems.map((item) => {
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const Icon = item.icon;
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const isActive = pathname === item.href || pathname.startsWith(`${item.href}/`);
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return (
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<Link
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key={item.href}
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href={item.comingSoon ? "#" : item.href}
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onClick={(e) => {
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if (item.comingSoon) {
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e.preventDefault();
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return;
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}
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onNavigate?.();
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}}
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className={cn(
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"flex items-center gap-3 px-4 py-3 rounded-lg text-sm font-medium transition-all duration-200",
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isActive
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? "bg-emerald-500/10 text-emerald-400 border border-emerald-500/20"
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: "text-neutral-400 hover:text-neutral-100 hover:bg-neutral-800/50",
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item.comingSoon && "opacity-50 cursor-not-allowed"
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)}
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>
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<Icon className="w-5 h-5" />
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<span className="flex-1">{item.label}</span>
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{item.comingSoon && (
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<span className="text-xs px-2 py-0.5 rounded-full bg-neutral-800 text-neutral-500">
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Soon
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</span>
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)}
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{isActive && <ChevronRight className="w-4 h-4" />}
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</Link>
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);
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})}
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</nav>
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{/* Footer */}
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<div className="p-4 border-t border-neutral-800">
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<div className="px-4 py-3 rounded-lg bg-neutral-800/50 border border-neutral-700/50">
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<p className="text-xs text-neutral-500">AgentLens v0.1.0</p>
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</div>
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</div>
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</div>
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);
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}
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export default function DashboardLayout({ children }: { children: ReactNode }) {
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const [sidebarOpen, setSidebarOpen] = useState(false);
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return (
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<div className="min-h-screen bg-neutral-950 flex">
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{/* Desktop Sidebar */}
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<aside className="hidden lg:block w-64 h-screen sticky top-0">
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<Sidebar />
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</aside>
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{/* Mobile Sidebar Overlay */}
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{sidebarOpen && (
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<div
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className="fixed inset-0 bg-black/50 z-40 lg:hidden"
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onClick={() => setSidebarOpen(false)}
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/>
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)}
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{/* Mobile Sidebar */}
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<aside
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className={cn(
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"fixed inset-y-0 left-0 w-72 z-50 transform transition-transform duration-300 ease-in-out lg:hidden",
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sidebarOpen ? "translate-x-0" : "-translate-x-full"
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)}
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>
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<Sidebar onNavigate={() => setSidebarOpen(false)} />
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</aside>
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{/* Main Content */}
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<main className="flex-1 min-w-0">
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{/* Mobile Header */}
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<header className="lg:hidden sticky top-0 z-30 bg-neutral-950/80 backdrop-blur-md border-b border-neutral-800 px-4 py-3">
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<div className="flex items-center justify-between">
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<button
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onClick={() => setSidebarOpen(true)}
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className="p-2 rounded-lg bg-neutral-900 border border-neutral-800 text-neutral-400 hover:text-neutral-100 transition-colors"
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>
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<Menu className="w-5 h-5" />
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</button>
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<Link href="/" className="flex items-center gap-2">
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<div className="w-8 h-8 rounded-lg bg-gradient-to-br from-emerald-400 to-emerald-600 flex items-center justify-center">
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<Activity className="w-4 h-4 text-white" />
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</div>
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<span className="font-bold text-neutral-100">AgentLens</span>
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</Link>
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<div className="w-9" />
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</div>
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</header>
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{/* Page Content */}
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<div className="p-4 sm:p-6 lg:p-8">
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{children}
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</div>
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</main>
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</div>
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);
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}
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63
apps/web/src/app/dashboard/page.tsx
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63
apps/web/src/app/dashboard/page.tsx
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import { TraceList } from "@/components/trace-list";
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interface TracesResponse {
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traces: Array<{
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id: string;
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name: string;
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status: "RUNNING" | "COMPLETED" | "ERROR";
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startedAt: string;
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endedAt: string | null;
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durationMs: number | null;
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tags: string[];
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metadata: Record<string, unknown>;
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_count: {
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decisionPoints: number;
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spans: number;
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events: number;
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};
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}>;
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total: number;
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page: number;
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limit: number;
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totalPages: number;
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}
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async function getTraces(
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limit = 50,
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page = 1
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): Promise<TracesResponse> {
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try {
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const res = await fetch(
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`http://localhost:3000/api/traces?limit=${limit}&page=${page}`,
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{ cache: "no-store" }
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);
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if (!res.ok) {
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throw new Error(`Failed to fetch traces: ${res.status}`);
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}
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return res.json();
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} catch (error) {
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console.error("Error fetching traces:", error);
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return {
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traces: [],
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total: 0,
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page: 1,
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limit,
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totalPages: 0,
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};
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}
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}
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export default async function DashboardPage() {
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const data = await getTraces(50, 1);
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return (
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<TraceList
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initialTraces={data.traces}
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initialTotal={data.total}
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initialTotalPages={data.totalPages}
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initialPage={data.page}
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/>
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);
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}
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87
apps/web/src/app/dashboard/traces/[id]/page.tsx
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87
apps/web/src/app/dashboard/traces/[id]/page.tsx
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@@ -0,0 +1,87 @@
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import { notFound } from "next/navigation";
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import { TraceDetail } from "@/components/trace-detail";
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interface TraceResponse {
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trace: {
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id: string;
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name: string;
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status: "RUNNING" | "COMPLETED" | "ERROR";
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startedAt: string;
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endedAt: string | null;
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durationMs: number | null;
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tags: string[];
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metadata: Record<string, unknown>;
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costUsd: number | null;
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};
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decisionPoints: Array<{
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id: string;
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type: string;
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chosenAction: string;
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alternatives: string[];
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reasoning: string | null;
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contextSnapshot: Record<string, unknown> | null;
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confidence: number | null;
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timestamp: string;
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}>;
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spans: Array<{
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id: string;
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name: string;
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type: string;
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status: "OK" | "ERROR" | "CANCELLED";
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startedAt: string;
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endedAt: string | null;
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durationMs: number | null;
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input: unknown;
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output: unknown;
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metadata: Record<string, unknown>;
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}>;
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events: Array<{
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id: string;
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type: string;
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name: string;
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timestamp: string;
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metadata: Record<string, unknown>;
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}>;
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}
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async function getTrace(id: string): Promise<TraceResponse | null> {
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try {
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const res = await fetch(`http://localhost:3000/api/traces/${id}`, {
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cache: "no-store",
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});
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if (!res.ok) {
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if (res.status === 404) {
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return null;
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}
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throw new Error(`Failed to fetch trace: ${res.status}`);
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}
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return res.json();
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} catch (error) {
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console.error("Error fetching trace:", error);
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return null;
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}
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}
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interface TraceDetailPageProps {
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params: Promise<{ id: string }>;
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}
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export default async function TraceDetailPage({ params }: TraceDetailPageProps) {
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const { id } = await params;
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const data = await getTrace(id);
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if (!data) {
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notFound();
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}
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return (
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<TraceDetail
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trace={data.trace}
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decisionPoints={data.decisionPoints}
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spans={data.spans}
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events={data.events}
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/>
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);
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}
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