feat: Add server health check at '/api/health'

Author: codinsonn

apps/expo/app/(public)/images/index.tsx renamed to apps/expo/app/(main)/images/index.tsx

@@ -0,0 +1,27 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { healthCheck } from '@app/core/resolvers/healthCheck'
+
+/* --- Types ----------------------------------------------------------------------------------- */
+
+type RequestContext<T = Record<string, unknown>> = {
+    params: T
+}
+
+/* --- Handlers -------------------------------------------------------------------------------- */
+
+export const handler = async (req: NextRequest, context: RequestContext) => {
+    // Input
+    const searchParams = req.nextUrl.searchParams
+    const echo = searchParams.get('echo') || null
+
+    // Run
+    const serverHealth = await healthCheck({ echo, req })
+
+    // Respond
+    return NextResponse.json(serverHealth)
+}
+
+/* --- Methods --------------------------------------------------------------------------------- */
+
+export const GET = handler
+

apps/expo/app/(public)/index.tsx renamed to apps/expo/app/(main)/index.tsx

@@ -0,0 +1,65 @@
+import type { NextApiRequest } from 'next'
+import * as OS from 'os'
+
+/* --- Constants ------------------------------------------------------------------------------- */
+
+const ALIVE_SINCE = new Date()
+
+/* --- Types ----------------------------------------------------------------------------------- */
+
+type HealthCheckArgs = {
+  echo: string
+  req: Request | NextApiRequest
+}
+
+/** --- healthCheck() -------------------------------------------------------------------------- */
+/** -i- Check the health status of the server. Includes relevant urls, server time(zone), versions and more */
+export const healthCheck = async (args: HealthCheckArgs) => {
+    // Input
+    const { echo, req } = args
+
+    // Vars
+    const now = new Date()
+    const aliveTime = now.getTime() - ALIVE_SINCE.getTime()
+
+    // Urls
+    const r = req as Request
+    const rn = req as NextApiRequest
+    const reqHost = rn?.headers?.host
+    const reqProtocol = rn?.headers?.['x-forwarded-proto'] ?? 'http'
+    const requestURL = r?.url ?? `${reqProtocol}://${reqHost}/api/health`
+    const baseURL = process.env.BACKEND_URL || requestURL?.split('/api/')[0]
+    const apiURL = baseURL ? `${baseURL}/api` : null
+
+    // -- Respond --
+
+    return {
+        // PARAMS
+        echo,
+        // STATUS
+        status: 'OK',
+        alive: true,
+        kicking: true,
+        // TIME & DATES
+        now: now.toISOString(),
+        aliveTime,
+        aliveSince: ALIVE_SINCE.toISOString(),
+        serverTimezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
+        // URLS
+        requestURL,
+        baseURL,
+        apiURL,
+        port: process.env.PORT ? Number(process.env.PORT) : null,
+        debugPort: process.debugPort && Number(process.debugPort),
+        // VERSIONS
+        nodeVersion: process.versions.node,
+        v8Version: process.versions.v8,
+        // SYSTEM
+        systemArch: OS.arch(),
+        systemPlatform: OS.platform(),
+        systemRelease: OS.release(),
+        systemFreeMemory: OS.freemem(),
+        systemTotalMemory: OS.totalmem(),
+        systemLoadAverage: OS.loadavg(),
+    }
+}