Trigger handle-new-mails on new mails

GitGitGadget maintains a mirror of the Git mailing list at
https://github.com/gitgitgadget/git-mailing-list-mirror/, synchronizing
it via the `sync-git-mailing-list-mirror` workflow.

As a side effect of having installed the `gitgitgadget` GitHub App on
that repository (so that the workflow can push updates), GitGitGadget's
App also receives webhook events from that repository.

Let's put that fact to good use by triggering the new `handle-new-mails`
GitHub workflow that wants to replace GitGitGadget's "Mirror Git List to
GitGitGadget's PRs" Azure Pipeline at
https://dev.azure.com/gitgitgadget/git/_build?definitionId=5 (which
polled the upstream Git mailing list repository).

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

Author: dscho

GitGitGadget/index.js

@@ -59,7 +59,21 @@ module.exports = async (context, req) => {
                 body: `Ignored event type: ${eventType}`,
             };
         } else if (eventType === 'push') {
-            if (req.body.repository.full_name !== 'git/git') {
+            if (req.body.repository.full_name ==='gitgitgadget/git-mailing-list-mirror') {
+                context.res = { body: `push(${req.body.ref} in ${req.body.repository.full_name}): ` }
+                if (req.body.ref === 'refs/heads/lore-1') {
+                    const queued = await listWorkflowRuns(...a, 'handle-new-mails.yml', 'queued')
+                    if (queued.length) {
+                        context.res.body += [
+                            `skip triggering handle-new-emails, ${queued} already queued:`,
+                            queued.map(e => `- ${e.html_url}`)
+                        ].join('\n')
+                    } else {
+                        const run = await triggerWorkflowDispatch(...a, 'handle-new-mails.yml', 'main')
+                        context.res.body += `triggered ${run.html_url}`
+                    }
+                } else context.res.body += `Ignoring non-default branches`
+            } else if (req.body.repository.full_name !== 'git/git') {
                 context.res = { body: `Ignoring pushes to ${req.body.repository.full_name}` }
             } else {
                 const run = await triggerWorkflowDispatch(

__tests__/index.test.js

@@ -255,4 +255,31 @@ testWebhookPayload('react to `seen` being pushed to git/git', 'push', {
         'main',
         undefined
     ])
+})
+
+testWebhookPayload('react to `lore-1` being pushed to https://github.com/gitgitgadget/git-mailing-list-mirror', 'push', {
+    ref: 'refs/heads/lore-1',
+    repository: {
+        full_name: 'gitgitgadget/git-mailing-list-mirror',
+        owner: {
+            login: 'gitgitgadget'
+        }
+    }
+}, (context) => {
+    expect(context.res).toEqual({
+        body: [
+            'push(refs/heads/lore-1 in gitgitgadget/git-mailing-list-mirror):',
+            'triggered <the URL to the workflow handle-new-mails.yml run on main with inputs undefined>'
+        ].join(' ')
+    })
+    expect(mockTriggerWorkflowDispatch).toHaveBeenCalledTimes(1)
+    expect(mockTriggerWorkflowDispatch.mock.calls[0]).toEqual([
+        context,
+        undefined,
+        'gitgitgadget-workflows',
+        'gitgitgadget-workflows',
+        'handle-new-mails.yml',
+        'main',
+        undefined
+    ])
 })