fix: safer @nuxt/content integration

Relates to harlan-zw/nuxt-seo#273

Author: harlan-zw

src/runtime/nitro/logger.ts

@@ -0,0 +1,5 @@
+import { createConsola } from 'consola'
+
+export const logger = createConsola({
+  defaults: { tag: '@nuxtjs/robots' },
+})

src/runtime/nitro/plugins/initContext.ts

@@ -1,6 +1,7 @@
 import type { NitroApp } from 'nitropack'
 import { withoutTrailingSlash } from 'ufo'
 import { resolveRobotsTxtContext } from '../util'
+import { logger } from '../logger'
 import { defineNitroPlugin, getRouteRules, useRuntimeConfig } from '#imports'
 
 const PRERENDER_NO_SSR_ROUTES = new Set(['/index.html', '/200.html', '/404.html'])
@@ -13,8 +14,17 @@ export default defineNitroPlugin(async (nitroApp: NitroApp) => {
   await resolveRobotsTxtContext(undefined, nitroApp)
   const nuxtContentUrls = new Set<string>()
   if (usingNuxtContent) {
-    const urls = await (await nitroApp.localFetch('/__robots__/nuxt-content.json', {})).json()
-    urls.forEach((url: string) => nuxtContentUrls.add(withoutTrailingSlash(url)))
+    let urls: string[] | undefined
+    try {
+      urls = await (await nitroApp.localFetch('/__robots__/nuxt-content.json', {})).json()
+    }
+    catch (e) {
+      logger.error('Failed to read robot rules from content files.', e)
+      // silently fail I suppose
+    }
+    if (urls && Array.isArray(urls) && urls.length) {
+      urls.forEach((url: string) => nuxtContentUrls.add(withoutTrailingSlash(url)))
+    }
   }
   nitroApp._robots.nuxtContentUrls = nuxtContentUrls
 

src/runtime/nitro/server/__robots__/nuxt-content.ts

@@ -1,12 +1,19 @@
 import { defineEventHandler } from 'h3'
-import type { ParsedContent } from '@nuxt/content/dist/runtime/types'
+import type { ParsedContent } from '@nuxt/content'
+import { logger } from '../../logger'
 
 // @ts-expect-error alias module
 import { serverQueryContent } from '#content/server'
 
 export default defineEventHandler(async (e) => {
-  const contentList = (await serverQueryContent(e).find()) as ParsedContent[]
-  return contentList.map((c) => {
+  const content: ParsedContent[] = []
+  try {
+    content.push(...(await serverQueryContent(e).find()) as ParsedContent[])
+  }
+  catch (e) {
+    logger.error('Error querying Nuxt content', e)
+  }
+  return content.map((c) => {
     if (c._draft || c._extension !== 'md' || c._partial)
       return false
     if (c.path) {