refactor(ethflow-watcher): port to Host trait + MockHost tests (BLEU-855)#25
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…855) Same shape as BLEU-854 (twap-monitor / PR #24). Closes the M2-side gap on ethflow-watcher. Before: `submit_placement`, `prior_outcome`, `apply_submit_retry`, and the `submitted:` / `dropped:` / `backoff:` bookkeeping called `local_store::*` and `cow_api::submit_order` directly, with all the state-machine bits unverified in unit (only 7 decoder / encoder tests). After: 1. `strategy.rs` (new) - pure logic against `shepherd_sdk::host::Host`. `LogView<'a>` keeps the strategy wit- independent; `on_logs` is the entry point. 2. `lib.rs` (rewritten, 427 -> 157 lines) - wit-bindgen `generate!`, `WitBindgenHost` adapter, `Guest` impl that destructures `types::Event::Logs` into `LogView`s and delegates to `strategy::on_logs`. 3. Tests against `shepherd_sdk_test::MockHost` (5 new) cover the dispatch + idempotency matrix: - `placement_log_submits_order_and_persists_submitted_uid` - `redelivered_placement_is_skipped_via_submitted_uid_dedup` (PR #10 / commit c5e4d7d regression guard) - `submit_transient_error_writes_backoff_marker_and_returns` - `submit_permanent_error_persists_dropped_uid_and_clears_backoff` - `eip1271_signature_shape_round_trips_through_submit_body` (decodes the JSON body MockCowApi received and asserts `signingScheme=eip1271`, signature blob verbatim, `from` = EthFlow contract) 4. All 7 original pure tests preserved unchanged. Total: 12 tests (was 7). Numbers: - `.wasm` 281,518 bytes (release wasm32-wasip2). - 12 tests passing; clippy clean on host + wasm32-wasip2. - 0 em-dashes in the module tree. Stacks on PR #24 (BLEU-854) so reviewers can compare both M2 strategy / lib.rs splits in one stack with the M3 examples.
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Summary
Mirror of #24 (twap-monitor / BLEU-854) for the second M2 module. Closes the parallel gap on ethflow-watcher: `submit_placement` and the `submitted:` / `dropped:` / `backoff:` bookkeeping were calling `local_store::*` + `cow_api::submit_order` directly, so the dispatch + idempotency state machine introduced by PR #10 / commit c5e4d7d was not unit-tested.
Tests
Total: 12 tests (was 7).
Numbers
Linear: BLEU-855.
Closes the M2 QA loop opened in the post-M3 audit. With #24 + this PR landed, the four host-trait modules (price-alert, stop-loss, twap-monitor, ethflow-watcher) all share the same `strategy.rs` + `lib.rs` shape - so M4 hardening (BLEU-842 supervisor restart, BLEU-845 poison pill) can MockHost-test the dispatch matrix in isolation.
Test plan