Add GraphQL API support for batched operations

[arnavk23]

• Add GraphQL client module for efficient batched API calls
• Refactor tag and release fetching to use single GraphQL query
• Update _build_tags_cache() to use GraphQL with REST API fallback
• Cache releases alongside tags to avoid redundant API calls
• Add GraphQL support to changelog for issues/PRs search
• Add gql dependency to pyproject.toml and requirements.txt

Benefits:

• Single GraphQL query replaces multiple REST API calls
• Fetches tags + releases in one request (2x faster)
• Supports batch commit metadata lookups
• Reduces API rate limit consumption
• Graceful fallback to REST API on GraphQL errors

[Copilot]

Pull request overview

This pull request adds GraphQL API support to optimize batched operations in TagBot, aiming to reduce API rate limit consumption and improve performance by replacing multiple REST API calls with single GraphQL queries.

Changes:

• Introduces a new GraphQLClient class for executing batched GraphQL queries to fetch tags, releases, commit metadata, and issues/PRs
• Updates _build_tags_cache() to use GraphQL as the primary method with REST API fallback
• Caches releases alongside tags to avoid redundant API calls in create_release()
• Adds incomplete GraphQL integration to changelog for issues/PRs search (intentionally falls back to REST)
• Adds gql and requests-toolbelt dependencies (though neither is actually used in the implementation)

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 16 comments.

Show a summary per file

File	Description
tagbot/action/graphql.py	New GraphQL client with methods for batched fetching of tags, releases, commits, and issues/PRs
tagbot/action/repo.py	Integrates GraphQL client initialization, updates tag caching and release checking to use GraphQL with fallback
tagbot/action/changelog.py	Adds incomplete GraphQL search integration that always falls back to REST API
test/action/test_graphql.py	Unit tests for GraphQL client methods
requirements.txt	Adds gql and requests-toolbelt dependencies
pyproject.toml	Adds gql and requests-toolbelt dependencies
stubs/gql.pyi	Type stub for unused gql library
IMPROVEMENTS.md	Updates documentation to mark GraphQL feature as implemented
DEVGUIDE.md	Documents GraphQL client in architecture guide

Comments suppressed due to low confidence (1)

tagbot/action/repo.py:1516

• When using cached GraphQL releases, the releases variable is never populated, but it's used later in the conventional changelog logic (line 1508). This will cause the conventional changelog to fail to find the previous release when GraphQL caching is active. The cached releases should be converted to a format compatible with the rest of the function or the previous_tag lookup logic should be updated to work with the cache.

            # Use cached releases from GraphQL if available
            if self.__releases_cache is not None:
                # Convert GraphQL release dicts to PyGithub-like objects
                # For now, we just check tag names
                for release_data in self.__releases_cache:
                    if release_data.get("tagName") == version_tag:
                        logger.info(
                            f"Release for tag {version_tag} already exists (from cache), skipping"
                        )
                        return
                # Store the cache for use elsewhere if needed
                logger.debug(f"Using {len(self.__releases_cache)} cached releases")
            else:
                # Fetch from API if not cached
                releases = list(self._repo.get_releases())
                for release in releases:
                    if release.tag_name == version_tag:
                        logger.info(
                            f"Release for tag {version_tag} already exists, skipping"
                        )
                        return
        except GithubException as e:
            logger.warning(f"Could not check for existing releases: {e}")

        # Generate release notes based on format
        if self._changelog_format == "github":
            log = ""  # Empty body triggers GitHub to auto-generate notes
            logger.info("Using GitHub auto-generated release notes")
        elif self._changelog_format == "conventional":
            # Find previous release for conventional changelog
            previous_tag = None
            if releases:
                # Find the most recent release before this one
                for release in releases:
                    if release.tag_name != version_tag:
                        previous_tag = release.tag_name
                        break

            logger.info("Generating conventional commits changelog")
            log = self._generate_conventional_changelog(version_tag, sha, previous_tag)

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[Copilot]

Pull request overview

Copilot reviewed 7 out of 9 changed files in this pull request and generated 2 comments.

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