feat: ship host metrics as a first-party in-process plugin

plugins/host-metrics/backend/widgets/uptime-collector.ts

@@ -0,0 +1,105 @@
+import type { Client } from "ssh2";
+import {
+  execCommand,
+  execPowerShell,
+  type HostPlatform,
+} from "../../../../src/backend/hosts/metrics-shared/common-utils.js";
+
+function formatUptime(uptimeSeconds: number): string {
+  const days = Math.floor(uptimeSeconds / 86400);
+  const hours = Math.floor((uptimeSeconds % 86400) / 3600);
+  const minutes = Math.floor((uptimeSeconds % 3600) / 60);
+  return `${days}d ${hours}h ${minutes}m`;
+}
+
+async function collectDarwinUptimeMetrics(client: Client): Promise<{
+  seconds: number | null;
+  formatted: string | null;
+}> {
+  let uptimeSeconds: number | null = null;
+  let uptimeFormatted: string | null = null;
+
+  try {
+    const bootTimeOut = await execCommand(client, "sysctl -n kern.boottime");
+    // "{ sec = 1700000000, usec = 123456 } Thu Nov 16 ..."
+    const match = bootTimeOut.stdout.match(/sec\s*=\s*(\d+)/);
+    if (match) {
+      const bootSeconds = Number(match[1]);
+      if (Number.isFinite(bootSeconds)) {
+        uptimeSeconds = Math.max(0, Date.now() / 1000 - bootSeconds);
+        uptimeFormatted = formatUptime(uptimeSeconds);
+      }
+    }
+  } catch {
+    // expected
+  }
+
+  return {
+    seconds: uptimeSeconds,
+    formatted: uptimeFormatted,
+  };
+}
+
+async function collectWindowsUptimeMetrics(client: Client): Promise<{
+  seconds: number | null;
+  formatted: string | null;
+}> {
+  let uptimeSeconds: number | null = null;
+  let uptimeFormatted: string | null = null;
+
+  try {
+    const { stdout } = await execPowerShell(
+      client,
+      "$os=Get-CimInstance Win32_OperatingSystem; [PSCustomObject]@{seconds=((Get-Date) - $os.LastBootUpTime).TotalSeconds} | ConvertTo-Json -Compress",
+    );
+    const parsed = JSON.parse(stdout.trim());
+    const seconds = Number(parsed?.seconds);
+    if (Number.isFinite(seconds)) {
+      uptimeSeconds = Math.max(0, seconds);
+      uptimeFormatted = formatUptime(uptimeSeconds);
+    }
+  } catch {
+    // expected
+  }
+
+  return {
+    seconds: uptimeSeconds,
+    formatted: uptimeFormatted,
+  };
+}
+
+export async function collectUptimeMetrics(
+  client: Client,
+  platform?: HostPlatform,
+): Promise<{
+  seconds: number | null;
+  formatted: string | null;
+}> {
+  if (platform === "darwin") {
+    return collectDarwinUptimeMetrics(client);
+  }
+  if (platform === "windows") {
+    return collectWindowsUptimeMetrics(client);
+  }
+
+  let uptimeSeconds: number | null = null;
+  let uptimeFormatted: string | null = null;
+
+  try {
+    const uptimeOut = await execCommand(client, "cat /proc/uptime");
+    const uptimeParts = uptimeOut.stdout.trim().split(/\s+/);
+    if (uptimeParts.length >= 1) {
+      uptimeSeconds = Number(uptimeParts[0]);
+      if (Number.isFinite(uptimeSeconds)) {
+        uptimeFormatted = formatUptime(uptimeSeconds);
+      }
+    }
+  } catch {
+    // expected
+  }
+
+  return {
+    seconds: uptimeSeconds,
+    formatted: uptimeFormatted,
+  };
+}