Joseph Doherty
e541339c07
Resolve audit findings: correct WorkerEnvelope proto/route/metric/session facts; rewrite auth (ZB.MOM.WW.Auth migration), dashboard (ZB.MOM.WW.Theme), and StyleGuide (foreign-project copy-paste); document alarm subsystem, Ldap options, and gateway alarm broker; fix client CLI flags and package paths.
160 lines
7.8 KiB
Markdown
160 lines
7.8 KiB
Markdown
# Protobuf Contracts
|
|
|
|
The contracts project contains the public gRPC API and the gateway-to-worker
|
|
IPC messages. The `.proto` files are the source of truth; generated C# files are
|
|
recreated by the contracts project build.
|
|
|
|
## Files
|
|
|
|
`src/ZB.MOM.WW.MxGateway.Contracts/Protos/mxaccess_gateway.proto` defines the public
|
|
`MxAccessGateway` gRPC service, command payloads, command replies, event DTOs,
|
|
`MxValue`, `MxArray`, and `MxStatusProxy`.
|
|
|
|
The public command model includes bulk subscription command kinds for
|
|
`AddItemBulk`, `AdviseItemBulk`, `RemoveItemBulk`, `UnAdviseItemBulk`,
|
|
`SubscribeBulk`, and `UnsubscribeBulk`. These commands are normal unary
|
|
`Invoke` payloads. They do not add separate gRPC methods, and they return a
|
|
`BulkSubscribeReply` containing per-item `SubscribeResult` records with
|
|
`ServerHandle`, `TagAddress`, `ItemHandle`, `WasSuccessful`, and
|
|
`ErrorMessage`.
|
|
|
|
The gateway forwards each bulk command as one worker command. The worker runs
|
|
the corresponding MXAccess `AddItem`, `Advise`, `UnAdvise`, and `RemoveItem`
|
|
calls sequentially on the session STA and preserves input order in the result
|
|
list.
|
|
|
|
The command model also includes bulk write/read command kinds:
|
|
`WriteBulk`, `Write2Bulk`, `WriteSecuredBulk`, `WriteSecured2Bulk`, and
|
|
`ReadBulk`. They are unary `Invoke` payloads on the same `MxAccessGateway`
|
|
surface (not separate gRPC methods) and exist so a caller can submit one list
|
|
of items per round trip while preserving MXAccess parity per entry.
|
|
|
|
- `WriteBulkCommand` / `Write2BulkCommand` / `WriteSecuredBulkCommand` /
|
|
`WriteSecured2BulkCommand` each carry a `server_handle` and a `repeated`
|
|
list of entries (`WriteBulkEntry`, `Write2BulkEntry`,
|
|
`WriteSecuredBulkEntry`, `WriteSecured2BulkEntry`). Each entry mirrors the
|
|
single-item command shape — `item_handle` + `value` (+ `timestamp_value` on
|
|
the `*2` variants, + `current_user_id` / `verifier_user_id` on the secured
|
|
variants). All four replies use `BulkWriteReply`, which carries
|
|
`repeated BulkWriteResult`. A `BulkWriteResult` has `server_handle`,
|
|
`item_handle`, `was_successful`, `optional int32 hresult`, `repeated
|
|
MxStatusProxy statuses`, and `error_message`. Per-entry failures populate
|
|
`error_message` + `hresult` and never raise — callers iterate and inspect
|
|
each entry. The credential-sensitive redaction rules for `WriteSecured` /
|
|
`WriteSecured2` apply to every `value` inside `WriteSecuredBulkEntry` and
|
|
`WriteSecured2BulkEntry`.
|
|
|
|
- `ReadBulkCommand` carries `server_handle`, `repeated string tag_addresses`,
|
|
and `uint32 timeout_ms` (0 means use the gateway-configured default). The
|
|
reply is `BulkReadReply` carrying `repeated BulkReadResult`. A
|
|
`BulkReadResult` has `server_handle`, `tag_address`, `item_handle`,
|
|
`was_successful`, `was_cached`, `value`, `quality`, `source_timestamp`,
|
|
`repeated MxStatusProxy statuses`, and `error_message`. MXAccess has no
|
|
synchronous `Read`, so `ReadBulk` is dual-mode per entry: when a tag is
|
|
already advised in the session the worker returns the cached
|
|
`OnDataChange` payload without touching the subscription
|
|
(`was_cached = true`); otherwise the worker takes a full
|
|
`AddItem` + `Advise` + wait-for-first-`OnDataChange` + `UnAdvise` +
|
|
`RemoveItem` snapshot lifecycle and returns the result
|
|
(`was_cached = false`). The asymmetry that `BulkReadResult` has no
|
|
`hresult` field is intentional — `ReadBulk` outcomes are timeout / cache
|
|
/ lifecycle states rather than MXAccess COM return codes.
|
|
|
|
See `gateway.md` for the full cached-vs-snapshot `ReadBulk` lifecycle and the
|
|
per-command scope requirements, and `docs/DesignDecisions.md` "Bulk Command
|
|
Family" for the rationale behind the per-entry result shape (independent
|
|
success tracking, input-order preservation, no partial-failure exceptions).
|
|
|
|
`src/ZB.MOM.WW.MxGateway.Contracts/Protos/mxaccess_worker.proto` defines the named-pipe
|
|
worker IPC envelope and control messages. It imports
|
|
`mxaccess_gateway.proto` so the worker and gateway use the same command, reply,
|
|
event, value, and status shapes.
|
|
|
|
`src/ZB.MOM.WW.MxGateway.Contracts/Protos/galaxy_repository.proto` defines the
|
|
`GalaxyRepository` service used by clients to browse the Galaxy Repository
|
|
(deployed object hierarchy and dynamic attributes). The service is metadata-
|
|
only and does not share types with `mxaccess_gateway.proto`. See
|
|
[Galaxy Repository Browse](./GalaxyRepository.md) for the RPC catalog and
|
|
behavior.
|
|
|
|
### Alarm RPCs and messages
|
|
|
|
`mxaccess_gateway.proto` also defines three session-less alarm RPCs served by
|
|
the gateway's always-on central alarm monitor (no client worker session is
|
|
involved):
|
|
|
|
- `AcknowledgeAlarm(AcknowledgeAlarmRequest) returns (AcknowledgeAlarmReply)` —
|
|
acknowledges one alarm by its `alarm_full_reference`, with an operator
|
|
`comment` and `operator_user`.
|
|
- `StreamAlarms(StreamAlarmsRequest) returns (stream AlarmFeedMessage)` — the
|
|
central alarm feed.
|
|
- `QueryActiveAlarms(QueryActiveAlarmsRequest) returns (stream
|
|
ActiveAlarmSnapshot)` — a point-in-time snapshot of the currently-active
|
|
alarm set, streamed so callers can begin processing without buffering the
|
|
whole set. `alarm_filter_prefix` (when non-empty) narrows the snapshot to
|
|
alarms whose `alarm_full_reference` starts with the prefix.
|
|
|
|
`StreamAlarms` uses a three-phase protocol carried by the `AlarmFeedMessage`
|
|
`oneof payload`: the stream opens with one `active_alarm` (`ActiveAlarmSnapshot`)
|
|
per currently-active alarm, then a single `snapshot_complete = true` sentinel,
|
|
then a `transition` (`OnAlarmTransitionEvent`) for every subsequent change.
|
|
`active_alarm` carries the collapsed current state (`AlarmConditionState`:
|
|
`Active` / `ActiveAcked` / `Inactive`); `transition` carries the
|
|
`AlarmTransitionKind` (`Raise` / `Acknowledge` / `Clear` / `Retrigger`).
|
|
|
|
`AcknowledgeAlarmRequest` and `AcknowledgeAlarmReply` both **reserve** field 1
|
|
and the name `session_id`: acknowledgement was made session-less and the field
|
|
was retired (the reservation prevents reuse of the tag). The authoritative
|
|
ack-outcome field on `AcknowledgeAlarmReply` is `hresult` (the worker's native
|
|
by-name/by-GUID ack return code, 0 = success), alongside `protocol_status`. The
|
|
structured `MxStatusProxy status` field is intentionally left **unset** on every
|
|
reply because the worker ack path produces only the int32 return code; clients
|
|
must read `hresult` and must not depend on `status` being populated.
|
|
|
|
For the broker architecture and the parse contract for `alarm_full_reference`
|
|
(GUID vs `Provider!Group.Tag`) see
|
|
[Alarm Client Discovery](./AlarmClientDiscovery.md).
|
|
|
|
Generated C# output is written to `src/ZB.MOM.WW.MxGateway.Contracts/Generated/`. Do not
|
|
hand-edit generated files.
|
|
|
|
Client generation inputs are published through
|
|
`clients/proto/proto-inputs.json` and the descriptor set under
|
|
`clients/proto/descriptors/`. See
|
|
[Client Proto Generation](./ClientProtoGeneration.md) for language-specific
|
|
generation inputs, output directories, and golden protobuf JSON fixtures.
|
|
|
|
## Generation
|
|
|
|
Run the contracts build to regenerate C# protobuf and gRPC code:
|
|
|
|
```bash
|
|
dotnet build src/ZB.MOM.WW.MxGateway.Contracts/ZB.MOM.WW.MxGateway.Contracts.csproj
|
|
```
|
|
|
|
Run the focused contract tests after changing either `.proto` file:
|
|
|
|
```bash
|
|
dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter ProtobufContractRoundTripTests
|
|
```
|
|
|
|
The full solution build also regenerates the C# contracts before compiling
|
|
gateway and test projects:
|
|
|
|
```bash
|
|
dotnet build src/ZB.MOM.WW.MxGateway.slnx
|
|
```
|
|
|
|
Regenerate the client descriptor after changing either `.proto` file:
|
|
|
|
```bash
|
|
powershell -ExecutionPolicy Bypass -File scripts/publish-client-proto-inputs.ps1
|
|
```
|
|
|
|
## Related Documentation
|
|
|
|
- [Client Proto Generation](./ClientProtoGeneration.md)
|
|
- [Gateway Process Detailed Design](./GatewayProcessDesign.md)
|
|
- [MXAccess Worker Instance Detailed Design](./MxAccessWorkerInstanceDesign.md)
|
|
- [Protobuf Style Guide](./style-guides/ProtobufStyleGuide.md)
|