Files
mxaccess/rust/Cargo.lock
T
Joseph Doherty a31237d1d0 [M4] mxaccess: Subscription impls Stream<Item = DataChange> (resolves F15)
F15 step 2/2 lands the per-Subscription routing on top of step 1's
broadcast layer. Subscription is now a working data-change stream.

Subscription type
- Now impls futures_util::Stream<Item = Result<DataChange, Error>>
  via tokio_stream::wrappers::BroadcastStream + a per-message filter.
- No longer Clone (broadcast::Receiver isn't Clone). Consumers that
  want fanout subscribe twice or share via Arc<Mutex<...>>.
- Holds the broadcast::Receiver subscribed BEFORE AdviseSupervisory
  fires — guarantees no updates between advise and stream-creation
  are dropped.
- pending VecDeque buffers records from the current message so each
  poll_next yields at most one DataChange (Stream contract).

Filter logic (records_to_data_changes, mirrors cs:333-343)
- 0x32 SubscriptionStatus: keep when
  msg.item_correlation_id == subscription.correlation_id; drop
  otherwise.
- 0x33 DataUpdate: keep ALL — codec exposes no per-record correlation
  field, and the .NET filter only checks item_correlation_id (which
  0x33 doesn't carry), so DataUpdates fan out to every active
  subscription. Matches .NET behavior verbatim.
- Records with value: None drop silently (mirrors evt.Record.Value
  is null filter at cs:337).
- BroadcastStream Lagged(n) maps to Error::Configuration with the
  lag count in the detail string.

Helpers
- filetime_to_system_time(i64) -> SystemTime: inverse of
  system_time_to_filetime; saturates at Unix epoch for FILETIMEs
  before 1970 since SystemTime can't portably represent pre-epoch.
- record_to_data_change(record, reference) -> Option<DataChange>:
  builds DataChange from one record, returns None for unparseable
  value (the codec couldn't decode the wire kind).
- Status currently hardcoded to MxStatus::DATA_CHANGE_OK (mirrors
  NmxSubscriptionRecord.ToDataChangeStatus at NmxSubscriptionMessage.cs:22-25
  which the .NET reference itself stubs to the OK constant).

Cargo.toml additions: futures-util (workspace) + tokio-stream (0.1
with sync feature for BroadcastStream).

Tests (5 new in mxaccess; total 40)
- subscription_stream_yields_data_change_for_matching_correlation:
  build a 0x32 SubscriptionStatus with one Int32 record and the
  subscription's correlation id, inject through test_inject_sender,
  observe the DataChange (reference, value, quality match) on the
  Stream.
- subscription_stream_filters_out_mismatched_correlation_for_status:
  inject 0x32 with wrong correlation id, assert the stream stays
  pending (timeout-as-success).
- subscription_stream_keeps_data_update_regardless_of_correlation:
  inject 0x33 DataUpdate with one Int32 record (no correlation
  field on the message); stream still yields the DataChange.
- filetime_to_system_time_round_trip: build a SystemTime with .005s
  precision, round-trip through both helpers, assert equality.
- filetime_to_system_time_pre_unix_epoch_saturates: FILETIME 0 (year
  1601) → SystemTime::UNIX_EPOCH (saturating clamp).

design/followups.md: F15 moved to Resolved with both step commits
referenced. Open list: 9 items (was 10).

Test count delta: 511 -> 516 (+5). All four DoD gates green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-05 09:45:16 -04:00

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