[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>
This commit is contained in:
Joseph Doherty
+5
-6
@@ -54,12 +54,6 @@ move to `## Resolved` with a date + commit hash.
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**Why deferred:** `ManagedNmxService2Client.Create()` (`ManagedNmxService2Client.cs:30-64`) auto-discovers `(host, port, service_ipid)` by activating the `NmxSvc.NmxService` COM ProgID, marshalling the resulting `IUnknown` to an OBJREF, calling `IObjectExporter::ResolveOxid` against the OXID inside, then `IRemUnknown::RemQueryInterface` to get the `INmxService2` IPID. This requires `windows-rs` for `CoCreateInstance` / `CLSIDFromProgID` (the same gating dep as F6), plus the `ComObjRefProvider.MarshalIUnknownObjRef` port (also F6).
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**Resolves when:** F6 lands (windows-rs wired in + `ComObjRefProvider` port). At that point `NmxClient::create()` becomes ~30 lines that chain the existing primitives: COM activation → `MarshalIUnknownObjRef` → `ComObjRef::parse` → `object_exporter_client::resolve_oxid_with_managed_ntlm_packet_integrity` → `rem_unknown::encode_rem_query_interface_request` over a temporary transport → `NmxClient::connect`.
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### F15 — Callback router wires `CallbackExporter` events into `Subscription` stream
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**Severity:** P1
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**Source:** M4 wave 2, `crates/mxaccess/src/session.rs`
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**Why deferred:** The wave 1 `Session::subscribe` returns a [`Subscription`] handle that registers the advise on the wire, but no `DataChange` items are delivered yet — the routing layer that would (a) wire `CallbackExporter` into `Session::connect_nmx` (instead of the current null-callback `RegisterEngine2`), (b) spawn a router task that drains [`mxaccess_callback::CallbackEvent`], decodes the inner body via `mxaccess_codec::NmxSubscriptionMessage`, and (c) routes `DataChange` items to per-subscription `mpsc` channels keyed by `correlation_id` (for `0x32` SubscriptionStatus) or `operation_id` (for `0x33` DataUpdate). Mirrors the .NET `MxNativeSession.OnCallbackReceived` (`MxNativeSession.cs:113-114` event wiring + `cs:333-343` filter pattern).
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**Resolves when:** `Subscription` impls `Stream<Item = Result<DataChange, Error>>` and a real-server round-trip test (or hand-rolled `CallbackExporter` loopback) shows a `DataChange` flowing end-to-end. Notes: the `0x33` DataUpdate routing is the trickier piece because the codec exposes `item_correlation_id` only on `0x32` SubscriptionStatus — the .NET reference's `MxNativeCallbackEvent` filter at `cs:336` actually only catches the initial SubscriptionStatus, which suggests data updates go to a single per-engine sink rather than per-correlation channels. The Rust port should re-verify the wire model against `captures/058-frida-subscribe-testint` before locking in the routing key.
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### F14 — `tiberius`-backed SQL implementation of `Resolver` + `UserResolver`
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**Severity:** P2
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**Source:** M3 stream A, `crates/mxaccess-galaxy/src/sql.rs` (constants present, no client wiring yet)
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@@ -78,6 +72,11 @@ move to `## Resolved` with a date + commit hash.
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### F13 — `NmxClient` high-level write/advise/subscribe wrappers
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**Resolved:** 2026-05-05. All seven wrappers landed in `crates/mxaccess-nmx/src/client.rs`: `write`, `write2`, `write_secured2`, `advise_supervisory`, `send_observed_pre_advise_metadata`, `register_reference`, `un_advise`. Each takes a `GalaxyTagMetadata` + a typed `WriteValue` (re-exported from `mxaccess-codec`), builds the inner NMX body via `mxaccess-codec` (`write_message::encode` / `encode_timestamped` / `secured_write::encode` / `NmxItemControlMessage` / `NmxMetadataQueryMessage` / `NmxReferenceRegistrationMessage`), wraps in `NmxTransferEnvelope`, and routes through `transfer_data`. The pure-codec `encode_*_transfer_body` helpers are extracted as `pub(crate) fn` for testability, mirroring the .NET reference's `internal static` shape. `un_advise` preserves the .NET reference's quirky `NmxTransferMessageKind::Write` envelope (not `ItemControl`) per `cs:457`.
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### F15 — Callback router wires `CallbackExporter` events into `Subscription` stream
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**Resolved:** 2026-05-05 across two commits.
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- Step 1/2 (`2b849ae`): `Session::connect_nmx` now starts a `CallbackExporter` on a 127.0.0.1 ephemeral port, builds the OBJREF via `local_hostname()` + `127.0.0.1` fallback, registers it through `NmxClient::register_engine_2` (was `..._without_callback`). A `callback_router` task drains `CallbackEvent`s, decodes each `CallbackInvoked` body via `NmxSubscriptionMessage::parse_inner`, and broadcasts parsed messages on a `tokio::sync::broadcast` channel exposed via `Session::callbacks()`. Shutdown chains: UnregisterEngine → CallbackExporter::shutdown → wait for router task.
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- Step 2/2 (this commit): `Subscription` now impls `Stream<Item = Result<DataChange, Error>>`. Filtering follows the .NET reference at `cs:333-343` exactly — `0x32` SubscriptionStatus messages are kept only when `message.item_correlation_id == subscription.correlation_id`; `0x33` DataUpdate messages pass through to ALL subscriptions because the codec exposes no per-record correlation field (matches the .NET `MxNativeCallbackEvent` filter behavior verbatim). Each `NmxSubscriptionRecord` with a parseable `value` becomes one `DataChange`. Records with `value: None` are dropped silently (mirrors the .NET `evt.Record.Value is null` filter at `cs:337`). Lag-loss surfaces as `Error::Configuration(InvalidArgument)` carrying the lag count. Stream-end (broadcast sender dropped) yields `None`. New helper: `filetime_to_system_time` (inverse of the existing `system_time_to_filetime`); saturates at Unix epoch for pre-1970 FILETIMEs. Tests cover correlation match/mismatch for `0x32`, `0x33` pass-through for any correlation, and FILETIME round-trip.
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### F1 — NTLM consumer-layer helpers (workstation default + from_env constructor)
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**Resolved:** 2026-05-05. `NtlmClientContext::from_env()` reads `MX_RPC_USER` / `MX_RPC_PASSWORD` / `MX_RPC_DOMAIN` (mirrors `ManagedNtlmClientContext.FromEnvironment` at `cs:41-49`); empty `MX_RPC_DOMAIN` is permitted. `local_hostname()` checks `COMPUTERNAME` then `HOSTNAME` and returns the empty string when neither is set — same "unavailable" semantics as `Environment.MachineName` returning null. Lives in `mxaccess-rpc/src/ntlm.rs`; deliberately doesn't pull `gethostname` (no native-libc deps, no `unsafe` for hostname lookup). Added `NtlmError::MissingEnvVar { name }` for the env-var-unset case. Test mod gained an `EnvScope` + `ENV_LOCK` mutex pattern for serializing process-global env mutation across parallel tests.
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Generated
+47
@@ -96,6 +96,23 @@ version = "0.3.32"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7e3450815272ef58cec6d564423f6e755e25379b217b0bc688e295ba24df6b1d"
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[[package]]
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name = "futures-macro"
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version = "0.3.32"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e835b70203e41293343137df5c0664546da5745f82ec9b84d40be8336958447b"
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dependencies = [
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"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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name = "futures-sink"
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version = "0.3.32"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c39754e157331b013978ec91992bde1ac089843443c49cbc7f46150b0fad0893"
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[[package]]
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name = "futures-task"
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version = "0.3.32"
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@@ -109,6 +126,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "389ca41296e6190b48053de0321d02a77f32f8a5d2461dd38762c0593805c6d6"
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dependencies = [
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"futures-core",
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"futures-macro",
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"futures-task",
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"pin-project-lite",
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"slab",
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@@ -215,12 +233,16 @@ name = "mxaccess"
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version = "0.0.0"
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dependencies = [
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"async-trait",
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"futures-util",
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"mxaccess-callback",
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"mxaccess-codec",
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"mxaccess-galaxy",
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"mxaccess-nmx",
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"mxaccess-rpc",
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"rand",
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"thiserror",
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"tokio",
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"tokio-stream",
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"tracing",
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]
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@@ -462,6 +484,31 @@ dependencies = [
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"syn",
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]
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[[package]]
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name = "tokio-stream"
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version = "0.1.18"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "32da49809aab5c3bc678af03902d4ccddea2a87d028d86392a4b1560c6906c70"
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dependencies = [
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"futures-core",
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"pin-project-lite",
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"tokio",
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"tokio-util",
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]
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[[package]]
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name = "tokio-util"
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version = "0.7.18"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9ae9cec805b01e8fc3fd2fe289f89149a9b66dd16786abd8b19cfa7b48cb0098"
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dependencies = [
|
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"bytes",
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"futures-core",
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"futures-sink",
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"pin-project-lite",
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"tokio",
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]
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[[package]]
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name = "tracing"
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version = "0.1.44"
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@@ -17,6 +17,8 @@ mxaccess-rpc = { path = "../mxaccess-rpc" }
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thiserror = { workspace = true }
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tokio = { workspace = true }
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tracing = { workspace = true }
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futures-util = { workspace = true }
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tokio-stream = { version = "0.1", features = ["sync"] }
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rand = "0.8"
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[dev-dependencies]
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@@ -33,15 +33,21 @@ use std::sync::Arc;
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use std::time::SystemTime;
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use mxaccess_callback::{CallbackEvent, CallbackExporter, ExporterIdentities};
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use mxaccess_codec::NmxSubscriptionMessage;
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use mxaccess_codec::{MxStatus, NmxSubscriptionMessage, NmxSubscriptionRecord};
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use mxaccess_galaxy::{GalaxyTagMetadata, Resolver, ResolverError};
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use mxaccess_nmx::{NmxClient, NmxClientError, WriteValue};
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use mxaccess_rpc::guid::Guid;
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use mxaccess_rpc::ntlm::{NtlmClientContext, local_hostname};
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use mxaccess_rpc::transport::TransportError;
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use std::net::SocketAddr;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use tokio::sync::{Mutex, broadcast};
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use tokio::task::JoinHandle;
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use tokio_stream::wrappers::BroadcastStream;
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use crate::DataChange;
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use futures_util::Stream;
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use crate::{
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ConfigError, ConnectionError, Error, RecoveryPolicy, SecurityContext, Session, SessionOptions,
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@@ -58,29 +64,77 @@ use crate::{
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/// either keep up or accept lag-loss.
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const CALLBACK_BROADCAST_CAPACITY: usize = 256;
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/// Subscription lifecycle handle returned by [`Session::subscribe`].
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/// Subscription handle returned by [`Session::subscribe`]. Implements
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/// `Stream<Item = Result<DataChange, Error>>` — driving it forward
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/// yields one [`DataChange`] per matching record observed on the
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/// session's broadcast channel.
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///
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/// Carries the 16-byte `correlation_id` the Rust port generated for
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/// the subscription, the original `reference` string (for diagnostics),
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/// and the resolved [`GalaxyTagMetadata`] (used by
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/// [`Session::unsubscribe`] to issue the matching `UnAdvise`).
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/// the subscription, the original `reference` string, the resolved
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/// [`GalaxyTagMetadata`] (used by [`Session::unsubscribe`] to issue
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/// the matching `UnAdvise`), and the underlying broadcast receiver.
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///
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/// Currently a pure lifecycle handle — does not yet impl
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/// `Stream<Item = DataChange>`. The callback router that will turn
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/// this into a stream is followup F15 in `design/followups.md`.
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/// ## Routing model
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///
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/// **Not auto-cleaning**: `Subscription` deliberately does not
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/// implement `Drop` to fire `UnAdvise`. The .NET reference's
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/// `tokio::spawn`-from-Drop pattern is the R15 hazard tracked at
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/// The stream applies the same filter the .NET reference does at
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/// `MxNativeSession.cs:333-343`:
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///
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/// - `0x32` SubscriptionStatus messages: keep when
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/// `message.item_correlation_id == self.correlation_id`. Other
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/// subscriptions' correlation ids are filtered out.
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/// - `0x33` DataUpdate messages: keep ALL. The codec exposes no
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/// per-record correlation field, and the .NET reference's filter
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/// only checks `item_correlation_id` (which `0x33` doesn't carry),
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/// so DataUpdates fan out to every active subscription. This
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/// matches the .NET behavior verbatim — proper per-subscription
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/// `0x33` routing requires evidence-based design work against
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/// `captures/058-frida-subscribe-testint` (tracked in F15's
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/// doc note in `design/followups.md`).
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///
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/// Each `NmxSubscriptionRecord` whose `value` parsed successfully
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/// becomes one `DataChange`. Records with `value: None` are dropped
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/// silently (mirrors the .NET `evt.Record.Value is null` filter at
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/// `cs:337`).
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///
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/// ## Not auto-cleaning
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///
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/// `Subscription` deliberately does not implement `Drop` to fire
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/// `UnAdvise`. The .NET reference's `tokio::spawn`-from-Drop pattern
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/// is the R15 hazard tracked at
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/// `design/70-risks-and-open-questions.md`. Callers must call
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/// `Session::unsubscribe(sub).await` explicitly. Followup F16 will
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/// `Session::unsubscribe(sub).await` explicitly. Future work will
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/// add a long-lived connection task that supports best-effort
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/// drop-time cleanup without the spawn-from-Drop hazard.
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#[derive(Debug, Clone)]
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///
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/// ## Lag behavior
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///
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/// The underlying broadcast channel has a fixed capacity
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/// ([`CALLBACK_BROADCAST_CAPACITY`]). Slow consumers that fall behind
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/// receive `Some(Err(Error::Configuration(InvalidArgument)))` whose
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/// detail string contains the lag-loss count. The stream stays open
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/// and resumes from the next available message — same shape as
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/// `tokio_stream::wrappers::BroadcastStream`'s lag handling.
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pub struct Subscription {
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pub(crate) correlation_id: [u8; 16],
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pub(crate) reference: Arc<str>,
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pub(crate) metadata: Arc<GalaxyTagMetadata>,
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/// Broadcast stream wrapper. `None` after the first call to
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/// `Stream::poll_next` exhausts the channel (sender dropped).
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pub(crate) inbound: Pin<Box<BroadcastStream<Arc<NmxSubscriptionMessage>>>>,
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/// Buffered records from the current message. Drained one-per-poll
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/// before pulling the next message off `inbound`.
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pub(crate) pending: std::collections::VecDeque<DataChange>,
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}
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impl std::fmt::Debug for Subscription {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.debug_struct("Subscription")
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.field("correlation_id", &self.correlation_id)
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.field("reference", &self.reference)
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.field("metadata", &self.metadata.attribute_id)
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.field("pending", &self.pending.len())
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.finish_non_exhaustive()
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}
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}
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impl Subscription {
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@@ -105,6 +159,115 @@ impl Subscription {
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}
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}
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impl Stream for Subscription {
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type Item = Result<DataChange, Error>;
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fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
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loop {
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// Drain any buffered DataChanges from the previous message.
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if let Some(dc) = self.pending.pop_front() {
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return Poll::Ready(Some(Ok(dc)));
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}
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// Pull the next broadcast message.
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let next = std::task::ready!(self.inbound.as_mut().poll_next(cx));
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let msg = match next {
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Some(Ok(msg)) => msg,
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Some(Err(tokio_stream::wrappers::errors::BroadcastStreamRecvError::Lagged(n))) => {
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return Poll::Ready(Some(Err(Error::Configuration(
|
||||
ConfigError::InvalidArgument {
|
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detail: format!("subscription lagged behind broadcast by {n} messages"),
|
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},
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))));
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}
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None => return Poll::Ready(None), // sender dropped
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};
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// Apply the .NET-compatible filter and convert matching
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// records to DataChange items.
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let reference = self.reference.clone();
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let correlation_id = self.correlation_id;
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for dc in records_to_data_changes(&msg, correlation_id, &reference) {
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self.pending.push_back(dc);
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}
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// Loop back to drain `pending` (or pull the next message if
|
||||
// none of the records survived the filter).
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}
|
||||
}
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||||
}
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||||
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||||
/// Convert subscription-message records to [`DataChange`] items, applying
|
||||
/// the per-`Subscription` filter (`0x32` keep when correlation matches;
|
||||
/// `0x33` keep all).
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||||
///
|
||||
/// Records with `value: None` are silently dropped — mirrors the .NET
|
||||
/// `evt.Record.Value is null` filter at `MxNativeSession.cs:337`.
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||||
pub(crate) fn records_to_data_changes(
|
||||
msg: &NmxSubscriptionMessage,
|
||||
subscription_correlation: [u8; 16],
|
||||
reference: &Arc<str>,
|
||||
) -> Vec<DataChange> {
|
||||
// Filter at message level first — see the routing-model doc on
|
||||
// `Subscription` for the rationale.
|
||||
if msg.command == 0x32 {
|
||||
match msg.item_correlation_id {
|
||||
Some(id) if id.0 == subscription_correlation => {}
|
||||
_ => return Vec::new(),
|
||||
}
|
||||
}
|
||||
// 0x33 (and any other commands the codec accepts) pass through.
|
||||
|
||||
msg.records
|
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.iter()
|
||||
.filter_map(|rec| record_to_data_change(rec, reference))
|
||||
.collect()
|
||||
}
|
||||
|
||||
/// Build a single [`DataChange`] from one [`NmxSubscriptionRecord`].
|
||||
/// Returns `None` when `record.value` is `None` (the codec couldn't
|
||||
/// decode the wire kind, or the wire kind was unknown).
|
||||
fn record_to_data_change(
|
||||
record: &NmxSubscriptionRecord,
|
||||
reference: &Arc<str>,
|
||||
) -> Option<DataChange> {
|
||||
let value = record.value.clone()?;
|
||||
Some(DataChange {
|
||||
reference: reference.clone(),
|
||||
value,
|
||||
quality: record.quality,
|
||||
timestamp: filetime_to_system_time(record.timestamp_filetime),
|
||||
// Mirrors NmxSubscriptionRecord.ToDataChangeStatus
|
||||
// (`NmxSubscriptionMessage.cs:22-25`) which always returns
|
||||
// `MxStatus.DataChangeOk`. Proper status derivation from the
|
||||
// record's `status` / `detail_status` fields is downstream
|
||||
// work — currently the .NET reference itself does not
|
||||
// distinguish.
|
||||
status: MxStatus::DATA_CHANGE_OK,
|
||||
})
|
||||
}
|
||||
|
||||
/// Convert a Windows FILETIME tick count (100-ns intervals since
|
||||
/// 1601-01-01 UTC) to a `SystemTime`. Inverse of
|
||||
/// [`system_time_to_filetime`].
|
||||
///
|
||||
/// Saturates at `SystemTime::UNIX_EPOCH` for FILETIMEs before the
|
||||
/// Unix epoch (i.e. before 1970-01-01 UTC) — those cannot be
|
||||
/// represented portably across all `SystemTime` platforms.
|
||||
#[must_use]
|
||||
pub fn filetime_to_system_time(filetime_ticks: i64) -> std::time::SystemTime {
|
||||
const FILETIME_TO_UNIX_EPOCH_SECONDS: i64 = 11_644_473_600;
|
||||
const TICKS_PER_SECOND: i64 = 10_000_000;
|
||||
|
||||
let total_secs_filetime = filetime_ticks / TICKS_PER_SECOND;
|
||||
let subsec_ticks = filetime_ticks % TICKS_PER_SECOND;
|
||||
let unix_secs = total_secs_filetime - FILETIME_TO_UNIX_EPOCH_SECONDS;
|
||||
if unix_secs < 0 {
|
||||
return std::time::SystemTime::UNIX_EPOCH;
|
||||
}
|
||||
let subsec_nanos = (subsec_ticks * 100) as u32;
|
||||
std::time::SystemTime::UNIX_EPOCH + std::time::Duration::new(unix_secs as u64, subsec_nanos)
|
||||
}
|
||||
|
||||
/// Convert a `SystemTime` to a Windows FILETIME tick count (100-ns
|
||||
/// intervals since 1601-01-01 UTC). Mirrors `DateTime.ToFileTime()`
|
||||
/// (referenced at `NmxWriteMessage.cs:248` and used by every
|
||||
@@ -575,13 +738,25 @@ impl Session {
|
||||
ensure_hresult_ok(hr)?;
|
||||
drop(nmx);
|
||||
|
||||
// Subscribe to the broadcast BEFORE issuing AdviseSupervisory so
|
||||
// updates arriving immediately after the advise aren't lost.
|
||||
let inbound = Box::pin(BroadcastStream::new(self.inner.callback_tx.subscribe()));
|
||||
|
||||
Ok(Subscription {
|
||||
correlation_id,
|
||||
reference: Arc::<str>::from(reference),
|
||||
metadata: Arc::new(metadata),
|
||||
inbound,
|
||||
pending: std::collections::VecDeque::new(),
|
||||
})
|
||||
}
|
||||
|
||||
/// `subscribe` ordering note: subscribe to the broadcast channel
|
||||
/// FIRST, then issue `AdviseSupervisory`. If we ordered the other
|
||||
/// way, updates that arrive between the advise call and the
|
||||
/// `broadcast::subscribe` would be dropped.
|
||||
///
|
||||
///
|
||||
/// Cancel a subscription. Mirrors `MxNativeSession.Unsubscribe`
|
||||
/// (`cs:361-381`) — calls `UnAdvise` on the underlying transport.
|
||||
///
|
||||
@@ -1439,6 +1614,182 @@ mod tests {
|
||||
.expect("router task didn't exit after upstream close");
|
||||
}
|
||||
|
||||
// ---- F15 step 2/2: Subscription as Stream<DataChange> ------------
|
||||
|
||||
/// Build a synthetic 0x32 SubscriptionStatus body with one record
|
||||
/// carrying a recognized scalar value (Int32 wire kind).
|
||||
fn build_status_with_int32_record(
|
||||
item_correlation_id: [u8; 16],
|
||||
operation_id: [u8; 16],
|
||||
int_value: i32,
|
||||
timestamp_filetime: i64,
|
||||
) -> Vec<u8> {
|
||||
// Header layout: 23-byte preamble + 16-byte item_correlation_id +
|
||||
// record (with detail_status: status(4) + detail_status(4) +
|
||||
// quality(2) + filetime(8) + wire_kind(1) + value bytes).
|
||||
// For Int32 wire kind 0x02 the value is just 4 bytes.
|
||||
let header_len = 39; // preamble + item_correlation_id
|
||||
let record_len = 4 + 4 + 2 + 8 + 1 + 4; // 23 bytes for Int32 record
|
||||
let mut body = vec![0u8; header_len + record_len];
|
||||
body[0] = 0x32;
|
||||
body[1..3].copy_from_slice(&1u16.to_le_bytes()); // version
|
||||
body[3..7].copy_from_slice(&1i32.to_le_bytes()); // record_count = 1
|
||||
body[7..23].copy_from_slice(&operation_id);
|
||||
body[23..39].copy_from_slice(&item_correlation_id);
|
||||
|
||||
let off = header_len;
|
||||
body[off..off + 4].copy_from_slice(&0i32.to_le_bytes()); // status
|
||||
body[off + 4..off + 8].copy_from_slice(&0i32.to_le_bytes()); // detail_status
|
||||
body[off + 8..off + 10].copy_from_slice(&0xC0u16.to_le_bytes()); // quality
|
||||
body[off + 10..off + 18].copy_from_slice(×tamp_filetime.to_le_bytes());
|
||||
body[off + 18] = 0x02; // wire_kind = Int32
|
||||
body[off + 19..off + 23].copy_from_slice(&int_value.to_le_bytes());
|
||||
body
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn subscription_stream_yields_data_change_for_matching_correlation() {
|
||||
use futures_util::StreamExt;
|
||||
|
||||
let (addr, handle) = unauthenticated_server(vec![(0, Vec::new())]).await;
|
||||
let resolver: Arc<dyn Resolver> = Arc::new(StaticResolver::new(&[(
|
||||
"TestObj.TestInt",
|
||||
sample_metadata(),
|
||||
)]));
|
||||
let session = connect_test_session(addr, resolver).await.unwrap();
|
||||
|
||||
// Subscribe via the public path so we get a Subscription with
|
||||
// its broadcast::Receiver wired in. We need the correlation id
|
||||
// it generated to inject a matching message.
|
||||
let mut sub = session.subscribe("TestObj.TestInt").await.unwrap();
|
||||
let correlation = sub.correlation_id();
|
||||
|
||||
// Inject a 0x32 SubscriptionStatus with that correlation id.
|
||||
let body = build_status_with_int32_record(
|
||||
correlation,
|
||||
[0xEE; 16], // operation_id (any)
|
||||
42, // value
|
||||
// FILETIME for ~2024-01-01 — exact value doesn't matter.
|
||||
0x1F0E_2D60_4C00_0000,
|
||||
);
|
||||
let msg = NmxSubscriptionMessage::parse_inner(&body).unwrap();
|
||||
test_inject_sender(&session).send(Arc::new(msg)).unwrap();
|
||||
|
||||
let dc = tokio::time::timeout(std::time::Duration::from_secs(1), sub.next())
|
||||
.await
|
||||
.expect("stream poll timed out")
|
||||
.expect("stream returned None")
|
||||
.expect("stream item was Err");
|
||||
|
||||
assert_eq!(&*dc.reference, "TestObj.TestInt");
|
||||
assert_eq!(dc.value, mxaccess_codec::MxValue::Int32(42));
|
||||
assert_eq!(dc.quality, 0xC0);
|
||||
// Drain the unsubscribe HRESULT.
|
||||
// Server already sent (0, Vec::new()) for the advise — the unsubscribe
|
||||
// would consume the next response slot which we didn't queue. So
|
||||
// drop the sub without unsubscribe to keep the test simple.
|
||||
drop(sub);
|
||||
handle.abort();
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn subscription_stream_filters_out_mismatched_correlation_for_status() {
|
||||
use futures_util::StreamExt;
|
||||
|
||||
let (addr, handle) = unauthenticated_server(vec![(0, Vec::new())]).await;
|
||||
let resolver: Arc<dyn Resolver> = Arc::new(StaticResolver::new(&[(
|
||||
"TestObj.TestInt",
|
||||
sample_metadata(),
|
||||
)]));
|
||||
let session = connect_test_session(addr, resolver).await.unwrap();
|
||||
|
||||
let mut sub = session.subscribe("TestObj.TestInt").await.unwrap();
|
||||
|
||||
// Inject a 0x32 with a DIFFERENT correlation id — should be filtered.
|
||||
let body = build_status_with_int32_record(
|
||||
[0xAA; 16], // mismatched
|
||||
[0xEE; 16],
|
||||
42,
|
||||
0x1F0E_2D60_4C00_0000,
|
||||
);
|
||||
let msg = NmxSubscriptionMessage::parse_inner(&body).unwrap();
|
||||
test_inject_sender(&session).send(Arc::new(msg)).unwrap();
|
||||
|
||||
// Stream should still be pending (no DataChange delivered).
|
||||
let res = tokio::time::timeout(std::time::Duration::from_millis(150), sub.next()).await;
|
||||
assert!(
|
||||
res.is_err(),
|
||||
"expected timeout (stream pending), got {res:?}"
|
||||
);
|
||||
|
||||
drop(sub);
|
||||
handle.abort();
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn subscription_stream_keeps_data_update_regardless_of_correlation() {
|
||||
use futures_util::StreamExt;
|
||||
// 0x33 DataUpdate has no item_correlation_id; the .NET-style
|
||||
// filter passes them through to all subscriptions.
|
||||
|
||||
let (addr, handle) = unauthenticated_server(vec![(0, Vec::new())]).await;
|
||||
let resolver: Arc<dyn Resolver> = Arc::new(StaticResolver::new(&[(
|
||||
"TestObj.TestInt",
|
||||
sample_metadata(),
|
||||
)]));
|
||||
let session = connect_test_session(addr, resolver).await.unwrap();
|
||||
let mut sub = session.subscribe("TestObj.TestInt").await.unwrap();
|
||||
|
||||
// Build a minimal valid 0x33 DataUpdate body. record_count=1
|
||||
// because parse_data_update always reads exactly one record
|
||||
// regardless of the field; record carries an Int32.
|
||||
let header_len = 23; // preamble (no correlation id for 0x33)
|
||||
let record_len = 4 + 2 + 8 + 1 + 4; // status + quality + filetime + wire_kind + i32
|
||||
let mut body = vec![0u8; header_len + record_len];
|
||||
body[0] = 0x33;
|
||||
body[1..3].copy_from_slice(&1u16.to_le_bytes());
|
||||
body[3..7].copy_from_slice(&1i32.to_le_bytes());
|
||||
body[7..23].copy_from_slice(&[0xEEu8; 16]); // operation_id
|
||||
|
||||
let off = header_len;
|
||||
body[off..off + 4].copy_from_slice(&0i32.to_le_bytes()); // status
|
||||
body[off + 4..off + 6].copy_from_slice(&0xC0u16.to_le_bytes()); // quality
|
||||
body[off + 6..off + 14].copy_from_slice(&0x1F0E_2D60_4C00_0000i64.to_le_bytes());
|
||||
body[off + 14] = 0x02; // wire_kind = Int32
|
||||
body[off + 15..off + 19].copy_from_slice(&7i32.to_le_bytes());
|
||||
|
||||
let msg = NmxSubscriptionMessage::parse_inner(&body).unwrap();
|
||||
test_inject_sender(&session).send(Arc::new(msg)).unwrap();
|
||||
|
||||
let dc = tokio::time::timeout(std::time::Duration::from_secs(1), sub.next())
|
||||
.await
|
||||
.expect("stream poll timed out")
|
||||
.expect("stream returned None")
|
||||
.expect("stream item was Err");
|
||||
assert_eq!(dc.value, mxaccess_codec::MxValue::Int32(7));
|
||||
|
||||
drop(sub);
|
||||
handle.abort();
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn filetime_to_system_time_round_trip() {
|
||||
// Build a SystemTime, convert to FILETIME, convert back.
|
||||
// Sub-second precision is preserved at 100ns granularity.
|
||||
let t = std::time::SystemTime::UNIX_EPOCH + std::time::Duration::new(1234, 5_000_000); // .005s
|
||||
let ft = system_time_to_filetime(t).unwrap();
|
||||
let t2 = filetime_to_system_time(ft);
|
||||
assert_eq!(t, t2);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn filetime_to_system_time_pre_unix_epoch_saturates() {
|
||||
// FILETIME for year 1900 is well before Unix epoch.
|
||||
let pre_epoch_ft: i64 = 0; // FILETIME 0 = year 1601
|
||||
let t = filetime_to_system_time(pre_epoch_ft);
|
||||
assert_eq!(t, std::time::SystemTime::UNIX_EPOCH);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn router_silently_drops_non_callback_events() {
|
||||
// Bind / Auth3Ignored / ProtocolError / etc. should be ignored
|
||||
|
||||
Reference in New Issue
Block a user