Comment on backport PR when status checks are done. (GH-27)

Leave a comment when status checks for the backport PR are done.
Only leave the comment on backports made by @miss-islington.
Mention the original PR author and the core dev who merged the original PR.
Closes python/miss-islington#26

backport/__main__.py

@@ -14,8 +14,12 @@
 from . import tasks
 from . import backport_pr
 from . import delete_branch
+from . import status_change
+
+router = routing.Router(backport_pr.router,
+                        delete_branch.router,
+                        status_change.router)
 
-router = routing.Router(backport_pr.router, delete_branch.router)
 cache = cachetools.LRUCache(maxsize=500)
 
 

backport/backport_pr.py

@@ -43,7 +43,11 @@ async def backport_pr(event, gh, *args, **kwargs):
 
             util.comment_on_pr(issue_number, message)
 
-            for branch in branches:
+            sorted_branches = sorted(branches,
+                                     reverse=True,
+                                     key=lambda v: tuple(map(int, v.split('.'))))
+
+            for branch in sorted_branches:
                 tasks.backport_task.delay(commit_hash,
                                           branch,
                                           issue_number=issue_number,

backport/status_change.py

@@ -0,0 +1,61 @@
+import requests
+import os
+import re
+
+from gidgethub import sansio, routing
+
+from . import util
+
+router = routing.Router()
+
+TITLE_RE = re.compile(r'\[(?P<branch>\d+\.\d+)\].+?(?P<pr>\d+)\)')
+
+
+
+@router.register("status")
+async def check_status(event, gh, *args, **kwargs):
+    """
+    Check the state change
+    """
+    if event.data["commit"]["committer"]["login"] == "miss-islington":
+        sha = event.data["sha"]
+        status_url = f"https://api.github.com/repos/python/cpython/commits/{sha}/status"
+        request_headers = sansio.create_headers(
+            "miss-islington",
+            oauth_token=os.getenv('GH_AUTH'))
+        response = requests.get(status_url,
+                                 headers=request_headers)
+        result = response.json()
+
+        if result["state"] != "pending":
+            url = "https://api.github.com/repos/miss-islington/cpython/git/refs/heads/"
+            response = requests.get(url, headers=request_headers)
+            for ref in response.json():
+                print("ref obj")
+                print(ref)
+                if "backport-" in ref["ref"] and ref["object"]["sha"] == sha:
+                    backport_branch_name = ref["ref"].split("/")[-1]
+                    pr_url = f"https://api.github.com/repos/python/cpython/pulls?state=open&head=miss-islington:{backport_branch_name}"
+                    pr_response = requests.get(pr_url, headers=request_headers).json()
+                    print("pr respponse")
+                    print(pr_response)
+                    if pr_response:
+                        pr_number = pr_response[0]["number"]
+                        normalized_pr_title = util.normalize_title(pr_response[0]["title"],
+                                                                   pr_response[0]["body"])
+
+                        title_match = TITLE_RE.match(normalized_pr_title)
+                        if title_match:
+                            original_pr_number = title_match.group('pr')
+                            original_pr_url = f"https://api.github.com/repos/python/cpython/pulls/{original_pr_number}"
+                            original_pr_result = requests.get(original_pr_url,
+                                                              headers=request_headers).json()
+                            pr_author = original_pr_result["user"]["login"]
+                            committer = original_pr_result["merged_by"]["login"]
+
+                            participants = util.get_participants(
+                                pr_author, committer)
+                            emoji = "✅" if result['state'] == "success" else "❌"
+                            util.comment_on_pr(
+                                pr_number,
+                                message=f"{participants}: Backport status check is done, and it's a {result['state']} {emoji} .")

backport/tasks.py

@@ -30,8 +30,13 @@ def backport_task(commit_hash, branch, *, issue_number, created_by, merged_by):
     """Backport a commit into a branch."""
     if not util.is_cpython_repo():
         # cd to cpython if we're not already in it
-
-        os.chdir('./cpython')
+        if "cpython" in os.listdir('.'):
+            os.chdir('./cpython')
+        else:
+            print(f"pwd: {os.pwd()}, listdir: {os.listdir('.')}")
+            util.comment_on_pr(issue_number,
+                               f"""{util.get_participants(created_by, merged_by)}, Something is wrong... I can't backport for now.
+                               Please backport using [cherry_picker](https://pypi.org/project/cherry-picker/) on command line.""")
     cp = cherry_picker.CherryPicker('origin', commit_hash, [branch])
     try:
         cp.backport()

backport/util.py

@@ -20,7 +20,7 @@ def comment_on_pr(issue_number, message):
                              headers=request_headers,
                              json=data)
     if response.status_code == requests.codes.created:
-        print(f"Commented at {response.json()['html_url']}")
+        print(f"Commented at {response.json()['html_url']}, message: {message}")
     else:
         print(response.status_code)
         print(response.text)
@@ -60,4 +60,13 @@ def delete_branch(branch_name):
     if response.status_code == 204:
         print(f"{branch_name} branch deleted.")
     else:
-        print(f"Couldn't delete the branch {branch_name}")
+        print(f"Couldn't delete the branch {branch_name}")
+
+
+def normalize_title(title, body):
+    """Normalize the title if it spills over into the PR's body."""
+    if not (title.endswith('…') and body.startswith('…')):
+        return title
+    else:
+        # Being paranoid in case \r\n is used.
+        return title[:-1] + body[1:].partition('\r\n')[0]