Fail when issues could not be listed

As of a couple of weeks ago, GitHub seems to have serious issues with
reliability, where the issues sometimes fail to be listed.

Those issues revealed that this here Action failed to inspect the
returned HTTP status (which was previously unnecessary because it was
always 200, but this now apparently is no longer as reliable).

Let's inspect the `status` attribute to find out, and complain loudly
instead of opening duplicate issues.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

__tests__/index.test.js

@@ -61,7 +61,7 @@ test('handles feed entries without titles', async () => {
   const date = '2021-06-19T01:01:29+12:00'
   mockHTTPSGet.__RETURN__ = `<feed xmlns="http://www.w3.org/2005/Atom"><entry><published>${date}</published><content type="html">TBD</content></entry></feed>`
   core.__INPUTS__['max-age'] = '9999d'
-  octokit.rest.issues.listForRepo.mockReturnValueOnce({ data: [] })
+  octokit.rest.issues.listForRepo.mockReturnValueOnce({ status: 200, data: [] })
   await run()
 
   expect(https.get).toHaveBeenCalledTimes(1)
@@ -105,7 +105,7 @@ Signed-off-by: Johannes Schindelin &amp;lt;johannes.schindelin@gmx.de&amp;gt;&lt
   </entry>
 </feed>
 `
-  octokit.rest.issues.listForRepo.mockReturnValueOnce({ data: [] })
+  octokit.rest.issues.listForRepo.mockReturnValueOnce({ status: 200, data: [] })
   await run()
 
   expect(octokit.rest.issues.create).toHaveBeenCalledWith({
@@ -166,7 +166,7 @@ test('curl -rc versions', async () => {
     <media:thumbnail height="30" width="30" url="https://avatars.githubusercontent.com/u/177011?s=60&amp;v=4"/>
   </entry>
 </feed>`
-  octokit.rest.issues.listForRepo.mockReturnValueOnce({ data: [] })
+  octokit.rest.issues.listForRepo.mockReturnValueOnce({ status: 200, data: [] })
   Object.assign(core.__INPUTS__, {
     'max-age': '9999d',
     prefix: '[New curl version]',
@@ -185,3 +185,18 @@ test('curl -rc versions', async () => {
     labels: undefined
   })
 })
+
+test('errors out if GitHub API returns 500', async () => {
+  mockHTTPSGet.__RETURN__ = `<?xml version="1.0" encoding="UTF-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/" xml:lang="en-US">
+  <entry>
+    <title>Hello></title>
+    <published>${new Date().toUTCString()}</published>
+    <content type="html">TBD</content>
+  </entry>
+</feed>`
+  octokit.rest.issues.listForRepo.mockReturnValueOnce({ status: 500, data: [], message: 'Server Error' })
+  // Expect an error to be thrown
+  await expect(run()).rejects.toThrow('Failed to list issues: 500 {"message":"Server Error"}')
+  expect(octokit.rest.issues.listForRepo).toHaveBeenCalledTimes(1)
+})

index.js

@@ -68,12 +68,13 @@ const run = async () => {
     // Remove old items in feed
     feed.items = feed.items.filter(x => x.pubDate === undefined || limitTime < new Date(x.pubDate).getTime())
 
-    const { data: issues } = await octokit.rest.issues.listForRepo({
+    const { status, data: issues, ...rest } = await octokit.rest.issues.listForRepo({
       owner: context.repo.owner,
       repo: context.repo.repo,
       state: 'all',
       labels
     })
+    if (status !== 200) throw new Error(`Failed to list issues: ${status} ${JSON.stringify(rest)}`)
     core.debug(`${issues.length} issues`)
 
     const createdIssues = []