api.views: update pr description on landing trigger (bug 2031664)

src/lando/api/legacy/api/landing_jobs.py

@@ -7,9 +7,11 @@
 from django.utils.decorators import method_decorator
 from django.views import View
 
+from lando.api.views import generate_enhanced_pr_description
 from lando.main.auth import require_authenticated_user
 from lando.main.models import JobAction, JobStatus, LandingJob
 from lando.utils.exceptions import NotFoundProblemException
+from lando.utils.github import GitHubAPIClient
 
 logger = logging.getLogger(__name__)
 
@@ -99,6 +101,18 @@ def put(self, request: WSGIRequest, job_id: int) -> JsonResponse:
             if landing_job.status in (JobStatus.SUBMITTED, JobStatus.DEFERRED):
                 landing_job.transition_status(JobAction.CANCEL)
                 landing_job.save()
+                if landing_job.is_pull_request_job:
+                    client = GitHubAPIClient(landing_job.target_repo.url)
+                    for revision in landing_job.revisions:
+                        pull_request = client.build_pull_request(revision.pull_number)
+                        description = generate_enhanced_pr_description(
+                            pull_request,
+                            landing_job.target_repo,
+                            template="pr_description_landing.md",
+                        )
+                        client.update_pull_request_body(
+                            revision.pull_number, description
+                        )
                 return JsonResponse({"id": landing_job.id})
             else:
                 data = {

src/lando/api/legacy/workers/landing_worker.py

@@ -97,6 +97,8 @@ def run_job(self, job: LandingJob) -> bool:
             True: The job finished processing and is in a permanent state.
             False: The job encountered a temporary failure and should be tried again.
         """
+        from lando.api.views import generate_enhanced_pr_description
+
         repo: Repo = job.target_repo
         scm = repo.scm
 
@@ -139,6 +141,13 @@ def run_job(self, job: LandingJob) -> bool:
             pull_number = job.revisions.first().pull_number
             message = f"Pull request closed by commit {commit_id}"
             client = GitHubAPIClient(job.target_repo.url)
+            pull_request = client.build_pull_request(pull_number)
+            description = generate_enhanced_pr_description(
+                pull_request,
+                job.target_repo,
+                template="pr_description_landing.md",
+            )
+            client.update_pull_request_body(pull_number, description)
             client.add_comment_to_pull_request(pull_number, message)
             client.close_pull_request(pull_number)
 

src/lando/api/views.py

@@ -99,6 +99,45 @@ def generate_warnings_and_blockers(
     return {"warnings": warnings, "blockers": blockers}
 
 
+def generate_enhanced_pr_description(
+    pull_request: PullRequest,
+    target_repo: Repo,
+    request: WSGIRequest = None,
+    template: str = "pr_description.md",
+) -> str:
+    context = {}
+    if request:
+        context.update(
+            generate_warnings_and_blockers(target_repo, pull_request, request)
+        )
+
+    context["landing_status"] = str(
+        get_pull_request_last_landing_job_status(target_repo.name, pull_request.number)
+    ).lower()
+
+    path = reverse(
+        "pull-request",
+        kwargs={
+            "repo_name": target_repo.name,
+            "number": pull_request.number,
+        },
+    )
+
+    context["lando_url"] = f"{settings.SITE_URL}{path}"
+    context["special_delimiter"] = SPECIAL_DELIMITER
+    bugs = parse_bugs(pull_request.title)
+    context["bugs"] = []
+
+    for bug in bugs:
+        context["bugs"].append((bug, f"{settings.BUGZILLA_URL}/{bug}"))
+
+    context["title"] = pull_request.title
+    context["body"] = pull_request.parsed_body
+
+    rendered = render_to_string(template, context)
+    return rendered
+
+
 @method_decorator(csrf_exempt, name="dispatch")
 class LegacyDiffWarningView(View):
     """
@@ -233,10 +272,10 @@ def get(
         self, request: WSGIRequest, repo_name: int, pull_number: int
     ) -> JsonResponse:
         """Return the status of a pull request based on landing job counts."""
-        status = str(
+        landing_status = str(
             get_pull_request_last_landing_job_status(repo_name, pull_number)
         ).lower()
-        return JsonResponse({"status": status}, status=200)
+        return JsonResponse({"status": landing_status}, status=200)
 
     @method_decorator(require_authenticated_user)
     def post(
@@ -302,6 +341,14 @@ class Form(forms.Form):
         job.status = JobStatus.SUBMITTED
         job.save()
 
+        description = generate_enhanced_pr_description(
+            self.pull_request,
+            self.target_repo,
+            request,
+            template="pr_description_landing.md",
+        )
+        self.client.update_pull_request_body(pull_number, description)
+
         return JsonResponse({"id": job.id}, status=201)
 
 
@@ -378,30 +425,10 @@ def get(
         if not request.user.has_perm("main.can_change_landing_job"):
             raise PermissionError()
 
-        context = {}
-        context.update(
-            generate_warnings_and_blockers(self.target_repo, self.pull_request, request)
+        description = generate_enhanced_pr_description(
+            self.pull_request, self.target_repo, request
         )
-
-        path = reverse(
-            "pull-request",
-            kwargs={
-                "repo_name": self.target_repo.name,
-                "number": self.pull_request.number,
-            },
+        self.client.update_pull_request_body(pull_number, description)
+        return JsonResponse(
+            {"status": f"Pull request {pull_number} description updated."}
         )
-
-        context["lando_url"] = f"{settings.SITE_URL}{path}"
-        context["special_delimiter"] = SPECIAL_DELIMITER
-        bugs = parse_bugs(self.pull_request.title)
-        context["bugs"] = []
-
-        for bug in bugs:
-            context["bugs"].append((bug, f"{settings.BUGZILLA_URL}/{bug}"))
-
-        context["title"] = self.pull_request.title
-        context["body"] = self.pull_request.parsed_body
-
-        rendered = render_to_string("pr_description.md", context)
-        self.client.update_pull_request_body(pull_number, rendered)
-        return JsonResponse({"context": context, "md": rendered})

src/lando/ui/jinja2/pr_description.md

@@ -11,10 +11,10 @@
 {% endfor %}
 {% endmacro %}
 
-{% block upper %}
 Lando: [link]({{ lando_url }})
 {% if bugs %}Bugzilla: {% for bug in bugs %}[bug {{ bug.0 }}]({{ bug.1 }}){% endfor %}{% endif %}
 
+{% block upper %}
 {% if not warnings and not blockers %}
 :white_check_mark: All Lando checks passed
 {% endif %}

src/lando/ui/jinja2/pr_description_landing.md

@@ -0,0 +1,4 @@
+{% extends "pr_description.md" %}
+{% block upper %}
+**Landing request {{ landing_status }}**
+{% endblock %}