Add hierarchical token-bucket scheduler for grid capacity control (#48)#86
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elizabetheonoja-art merged 5 commits intoJun 26, 2026
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…ility-Protocol#48) Replaces the flat per-meter rate limiter with a tree of rate-limited buckets (root -> region -> substation -> feeder -> meter) so hierarchical capacity is shared correctly and the sum of children can never exceed a parent: - ratelimit/htb: HtbTree of HtbNodes (atomic tokens/rate/ceil/burst/debt). A conform() debits the leaf and every ancestor; a node may go negative down to -burst (bursting/borrowing) and beyond that the request is rejected with the whole path rolled back. Refill tops up per node (rate * elapsed, capped at burst) via a CAS-claimed window; debt (negative balance) accrues interest (default 10% APR) and is repaid from refill, converging to zero. Time is injected (conform_at/refill_at(now_ns)) for deterministic behaviour. - ratelimit/topology: TopologyDef loader + validation (unique ids, existing parents, single root, cycle detection, and the invariant that the sum of a parent's children rates <= the parent ceil), building the HtbTree. Kept dependency-free / CI-runnable: no protoc (topology is a Rust def mirroring the kept topology.proto spec); dashmap and proptest are already deps. Self- contained (evaluator/admin call sites don't exist in this repo). Tests: deterministic coverage of topology validation, hierarchical debit + borrowing + rollback, refill/debt repayment, plus proptest properties that no node is ever driven below its burst floor and that a rejected request is a no-op.
…Bucket-Scheduler # Conflicts: # tests/mod.rs
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Hierarchical Token Bucket Scheduler for Multi-Tier Grid Capacity Allocation and Congestion Control (#48)
Closes #48
What's added (
src/ratelimit/)htb.rsHtbTreeofHtbNodes with atomictokens/rate/ceil/burst/debt.conform_at(leaf, requested, now_ns)debits the leaf and every ancestor; a node may go negative down to-burst(bursting/borrowing), and beyond that the request is rejected with the whole path rolled back (leaf→root, then reverse).refill_*tops up each node (rate × elapsed, capped atburst) via a CAS-claimed refill window so concurrent deductions aren't lost; debt (negative balance) accrues interest (default 10% APR) and is repaid from refill, converging to zero. Token unit = 1 µWh. Time is injected (*_at(now_ns)) for determinism.topology.rsTopologyDefloader +validate(): unique ids, existing parents, exactly one root, cycle detection, and the HTB invariant that Σ(children rates) ≤ parentceil; thenbuild()s the tree (parents-first).