feat(twap-monitor): index ConditionalOrderCreated → local-store (BLEU-826)#3
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`on_event(Event::Logs)` decodes each log against
`ComposableCoW.ConditionalOrderCreated` via `alloy_sol_types`,
extracts `(owner, params)`, and writes `watch:{owner}:{params_hash}`
to local-store with the abi-encoded `ConditionalOrderParams` as
the value. BLEU-827 reads this back via `list-keys("watch:")` and
the value is exactly the `(handler, salt, staticInput)` tuple the
poll path passes to `getTradeableOrderWithSignature`.
Idempotency: `local_store::set` overwrites in place, so re-org
replay or overlapping subscription windows produce no observable
side effect.
Resilience: `decode_conditional_order_created` returns `None`
when topic0 does not match the event signature or the payload
fails ABI decoding. Adjacent events on the same subscription
(MerkleRootSet, SwapGuardSet) are silently skipped instead of
short-circuiting the batch. The fn is on plain slices so the
host-free unit tests cover well-formed / wrong-topic / empty-
topics without wit-bindgen scaffolding.
Block, Tick, and Message variants of `Event` are left unhandled
in this PR — `Event::Block` dispatch lands in BLEU-827 (poll
path); the other two are not used by this module.
Adds `alloy-primitives` as a direct dep so the topic/data plumbing
does not rely on alloy types leaking through `cowprotocol`'s
re-exports.
`cargo build --target wasm32-wasip2 --release -p twap-monitor`
emits a 96 KB .wasm (up from the 65 KB skeleton because of the
alloy + cowprotocol composable types now linked in).
This was referenced Jun 15, 2026
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Summary
on_event(Event::Logs)decodes each log againstComposableCoW.ConditionalOrderCreatedviaalloy_sol_typesand writeswatch:{owner}:{params_hash}→abi_encode(params)to local-store.Decode fn is on plain slices so unit tests cover well-formed / wrong-topic / empty-topics without wit-bindgen scaffolding. Block / Tick / Message dispatch is left for BLEU-827 / future PRs.
Stacks on #2 (BLEU-825 skeleton). Base will switch to `dev/m2-base` once #2 merges.
Linear: BLEU-826. Ref ADR-0006.
Test plan