feat: implement EIP-7928 Block-Level Access Lists OpenTelemetry tracing#2
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feat: implement EIP-7928 Block-Level Access Lists OpenTelemetry tracing#2AbdelStark wants to merge 2 commits into
AbdelStark wants to merge 2 commits into
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January 28, 2026 18:24
Implements the OpenTelemetry tracing specification for EIP-7928 Block-Level Access Lists as defined in the BAL OTel spec. Adds: - BAL data model (BlockAccessList, BlockAccessListEntry) - OTel spans: ethereum.block, ethereum.tx.execute, ethereum.stateroot, ethereum.bal.prefetch (with optional per-account/slot child spans) - OTel metrics: counters and histograms per spec sections 6.2-6.3 - BAL tracing configuration (enable/disable, OTLP endpoint) - Integration with AbstractBlockProcessor for block processing tracing - Unit tests for all major components Key components: - BalOtelTracer: Main tracer managing span hierarchy - BalMetrics: Counter and histogram metrics as per specification - BalPrefetchTracer: Specialized prefetch phase tracing - BalSpanAttributes: Constants for span attribute names - BalTracingConfig: Configuration for tracing settings The implementation follows the span hierarchy defined in the spec: ethereum.block ├── ethereum.bal.prefetch │ ├── ethereum.bal.prefetch.account (optional) │ └── ethereum.bal.prefetch.slot (optional) ├── ethereum.tx.execute (per transaction) └── ethereum.stateroot Performance requirements addressed: - Lazy attribute setting for minimal overhead - Optional detailed tracing for per-account/slot spans - Configurable enable/disable settings Ref: besu-eth#9704
Comprehensive documentation covering: - Implementation overview and span hierarchy - Configuration and usage examples - Performance characteristics - Component descriptions - Future integration notes - Testing information
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Summary
Implements the OpenTelemetry tracing specification for EIP-7928 Block-Level Access Lists (BAL) as defined in the BAL OTel spec.
What's Included
BAL Data Model
BlockAccessList— Complete BAL data structure with accounts, storage slots, and code access trackingBlockAccessListEntry— Individual entry with storage keys and code access flagsOpenTelemetry Spans (Section 5)
Full span hierarchy per spec:
OpenTelemetry Metrics (Section 6)
Configuration
localhost:4317)Performance
Tests
BalOtelTracerTest— Tracer functionalityBalMetricsTest— Metrics recordingBlockAccessListTest— Data modelIntegration
Integrated into
AbstractBlockProcessorwith backward compatibility. BAL extraction is a placeholder (extractBlockAccessList) until the actual EIP-7928 block header data is available.References