fix(orchestrator): advance ingestion cursor only after notifications succeed

[Haseebx162006]

Addressed Issues:

Fixes #120

Summary of Changes:

• Root Cause: In Orchestrator._run_once_body (src/ghdcbot/engine/orchestrator.py), self.storage.set_cursor("github", new_cursor) was committed immediately after fetching and storing raw contributions. If a crash or network error occurred during notification dispatch (e.g. transient Discord API failures or timeouts), the sync cycle aborted, but the cursor had already moved forward. As a result, subsequent sync cycles skipped those events, permanently dropping their notifications.
• Fix:
  1. Removed the premature cursor persistence call right after contribution ingestion and kept the calculation in memory (cursor_after).
  2. Deferred calling self.storage.set_cursor("github", cursor_after) until directly after the notification dispatch block completes.
• Scope: Kept strictly small and focused only on the notification timing per maintainer instructions, leaving role evaluations and snapshots untouched since roles are rebuilt from stored events every run.

Testing:

• Added tests/test_cursor_after_notifications.py covering:
  • test_cursor_not_advanced_when_notifications_crash: Asserts cursor stays at prior_cursor when notification dispatch raises an error.
  • test_cursor_advanced_on_successful_sync: Asserts cursor advances to the latest contribution timestamp upon successful sync.
  • test_cursor_unchanged_when_no_new_contributions: Asserts cursor remains unchanged when no new events exist.
• Ran full test suite: 780 passed (0 regressions).
• Ran ruff check on modified and added files: 0 errors.

Screenshots / Test Proof:

New Cursor Timing Tests:

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Summary by CodeRabbit

• Bug Fixes
  • GitHub sync progress is now saved only after notifications are successfully dispatched, so interrupted runs can retry without skipping contributions.
  • The saved progress remains unchanged when there are no new contributions.

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Review configuration:

⚙️ Run configuration

• Configuration used: Repository: AOSSIE-Org/Gitcord-GithubDiscordBot/.coderabbit.yaml
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: c1fa8343-9b6f-4d5f-bab7-76353657371b

📥 Commits

Reviewing files that changed from the base of the PR and between 93b7131 and 819d0c7.

📒 Files selected for processing (1)

• tests/test_cursor_after_notifications.py

Walkthrough

The orchestrator now saves a newer GitHub cursor after notification dispatch. Tests cover cursor behavior when dispatch fails, when a sync succeeds, and when no new contributions are available.

Changes

GitHub cursor timing

Layer / File(s)	Summary
Defer cursor persistence until after notifications src/ghdcbot/engine/orchestrator.py, tests/test_cursor_after_notifications.py	The orchestrator records an eligible newer contribution timestamp and saves it after notification dispatch. Tests verify that a dispatch error leaves the cursor unchanged, a successful sync advances it, and a sync without contributions retains the prior value.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested labels: Python Lang

Suggested reviewers: shubham5080

Merge Risk: 🟡 Moderate · up to 93b71

Moving the cursor save after notification dispatch only protects against crashes. If Discord fails to deliver a message, the cursor still advances and that event is never retried. Separately, one new test uses a fixed date and will start failing in about a month. Fix both before merging.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	Issue #120 requires the cursor to remain unchanged until downstream processing succeeds, including role application and report generation. The PR delays cursor persistence until notification dispatch …	Move cursor persistence after the required downstream processing completes successfully. Add failure-path tests for role application and report generation, or define and implement explicit non-blocking behavior for those failures that meets…

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: the ingestion cursor advances only after notification dispatch succeeds.
Out of Scope Changes check	✅ Passed	The reported orchestrator change and the new cursor-timing tests all address issue #120. The reviewed code shows no demonstrated unrelated change.

Full details: Linked Issues check

Explanation

Issue #120 requires the cursor to remain unchanged until downstream processing succeeds, including role application and report generation. The PR delays cursor persistence until notification dispatch finishes, but Orchestrator._run_once_body persists it before write_reports and apply_discord_roles. An error in either later operation can therefore occur after the cursor advances. The reported tests cover notification failure and successful or empty syncs, but do not cover these later failures.

Resolution

Move cursor persistence after the required downstream processing completes successfully. Add failure-path tests for role application and report generation, or define and implement explicit non-blocking behavior for those failures that meets issue #120.

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_{A rabbit checks the cursor’s place,
Then waits for dispatch to complete.
If notices stumble, it stays put,
New contributions move it on,
And quiet runs leave it as found.}

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Actionable comments posted: 3

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @src/ghdcbot/engine/orchestrator.py:
- Around line 171-172: Update _send_notifications_for_new_events to distinguish
Discord delivery failures from expected False results such as disabled
notifications, and propagate delivery failures to the orchestrator. Only persist
cursor_after in the cursor update flow when notification delivery succeeded.

Review comments at @tests/test_cursor_after_notifications.py:
- Line 164: Update the successful-run test around orch.run_once() to enable the
pr_opened notification path and verify the cursor remains unchanged while
notification dispatch is in progress, then advances after dispatch returns.
- Line 153: Update the fixed event timestamps in both tests in
tests/test_cursor_after_notifications.py to be recent relative to the test run
and within the 30-day activity window, so the cursor-advance assertion and crash
test exercise eligible events.

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Reviewing files that changed from the base of the PR and between 8fbb78f and 93b7131.

📒 Files selected for processing (2)

• src/ghdcbot/engine/orchestrator.py
• tests/test_cursor_after_notifications.py

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[shubham5080]

Thanks Haseeb, this is exactly the scope we agreed: small, focused, and tested. Handling sends that fail without crashing would need per-event retry tracking (otherwise one user with closed DMs could block the cursor forever), so that's out of scope here. Merging.

[Haseebx162006]

Thanks @shubham5080 for review !!