bsky-experiments

ATProto Package

Go-based ATProto (Bluesky) ecosystem for firehose indexing, feed generation, and search.

Major Projects

Indexer (cmd/indexer, pkg/indexer)

Subscribes to Jetstream WebSocket, consumes firehose events, and indexes Bluesky records into ClickHouse. Tracks progress in Redis with cursor recovery for restarts.

Feed Generator (cmd/feedgen, pkg/feed-generator)

HTTP service providing Bluesky-compatible feed endpoints. Implements trending/hot feeds, label-based feeds (private communities), and static feeds. JWT and API key authentication.

Search Service (cmd/search, pkg/search)

HTTP service for search, statistics, and repository maintenance. Provides site-wide analytics, stats caching, and cleanup operations.

Development Workflow

# Start services (uses sops for secret decryption)
just common        # Start Redis (and maybe Clickhouse)
just indexer       # Start indexer
just feedgen       # Start feed generator
just search        # Start search service

# Stop services
just indexer-down
just feedgen-down
just search-down
just common-down

Building

All services use multi-stage Docker builds. Binaries compile with CGO_ENABLED=0 GOOS=linux.

# Build locally
go build -o indexer ./cmd/indexer
go build -o feedgen ./cmd/feedgen
go build -o search ./cmd/search

# Run tests
go test ./...

Service Ports

• Indexer: 8091 (metrics only)
• Feedgen: 8094 (app), 8095 (metrics)
• Search: 8092 (app), 8093 (metrics)
• Redis: 6379

Data Schemas

ClickHouse schema is managed via migrations in pkg/migrate/migrations/. Full schema reference: ../../.claude/skills/clickhouse-analyst/references/databases/default/_full_schema.sql

# Migration commands
just migrate-up           # Apply pending migrations
just migrate-down         # Rollback last migration
just migrate-version      # Show current version
just migrate-create foo   # Create new migration files
just migrate-dump-schema  # Regenerate full schema reference

Core Tables

Views

• recent_posts - Posts from last 72 hours
• recent_posts_with_score - Trending posts with engagement scoring
• following_counts - User following statistics
• daily_stats_* - Materialized views for daily aggregations

Key Packages

Feed Implementations

Located in pkg/feeds/:

• Hot (hot/feed.go): "whats-hot", "top-1h", "top-24h" - trending algorithm with Redis caching
• Author Label (authorlabel/feed.go): "a-mpls", "cl-tqsp" - private/public community feeds based on actor labels
• Static (static/feed.go): "bangers", "at-bangers", etc. - pinned posts

All feeds implement the interface in pkg/feed-generator/feed.go.

Configuration

Environment files in env/ (encrypted with sops):

• indexer.env / indexer.enc.env
• feedgen.env / feedgen.enc.env
• search.env / search.enc.env

Key environment variables:

• WS_URL - Jetstream WebSocket endpoint
• REDIS_ADDRESS - Redis connection
• CLICKHOUSE_ADDRESS, CLICKHOUSE_USERNAME, CLICKHOUSE_PASSWORD - ClickHouse connection
• OTEL_EXPORTER_OTLP_ENDPOINT - OpenTelemetry endpoint

Dependencies

• ATProto: github.com/bluesky-social/indigo, github.com/bluesky-social/jetstream
• Database: github.com/ClickHouse/clickhouse-go/v2, github.com/redis/go-redis/v9
• Web: github.com/labstack/echo/v4, github.com/samber/slog-echo
• Telemetry: go.opentelemetry.io/otel, local packages/telemetry

Patterns

• Soft deletes: ReplacingMergeTree with deleted UInt8 DEFAULT 0, queries filter on deleted = 0
• Time versioning: time_us column for ClickHouse deduplication
• OpenTelemetry: Each module creates tracer via otel.Tracer("module-name")
• Graceful shutdown: Signal handling with timeout-based cleanup