Add core streaming infrastructure (labels, state, resilience) #16
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- Load labels from CSV files with automatic type detection - Support hex string to binary conversion for Ethereum addresses - Thread-safe label storage and retrieval - Add LabelJoinConfig type for configuring joins
- StreamStateStore interface with in-memory, null, and DB-backed implementations - Checkpoint management for resume after interruptions - Idempotency tracking to prevent duplicate processing - Block range tracking with gap detection - Reorg invalidation support Key features: - Resume from last processed position after crashes - Exactly-once semantics via batch deduplication - Gap detection and intelligent backfill - Support for multiple networks and tables
- Exponential backoff with jitter for transient failures - Adaptive rate limiting with automatic adjustment - Back pressure detection and mitigation - Error classification (transient vs permanent) - Configurable retry policies Features: - Auto-detects rate limits and slows down requests - Detects timeouts and adjusts batch sizes - Production-tested configurations included
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Summary
Adds foundational streaming infrastructure for the amp Python client, but does not yet integrate it.
Changes
LabelManagerfor loading and managing CSV label datasetsStreamStateStoreinterface with in-memory and null implementationsamp_stream_state)Key Features
Part 1 of 5 in the streaming state management feature set.
The next PR (2/5) will integrate these features into the DataLoader base class.