Joseph Doherty
80 lines
3.0 KiB
Markdown
80 lines
3.0 KiB
Markdown
# Protobuf Contracts
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The contracts project contains the public gRPC API and the gateway-to-worker
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IPC messages. The `.proto` files are the source of truth; generated C# files are
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recreated by the contracts project build.
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## Files
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`src/MxGateway.Contracts/Protos/mxaccess_gateway.proto` defines the public
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`MxAccessGateway` gRPC service, command payloads, command replies, event DTOs,
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`MxValue`, `MxArray`, and `MxStatusProxy`.
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The public command model includes bulk subscription command kinds for
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`AddItemBulk`, `AdviseItemBulk`, `RemoveItemBulk`, `UnAdviseItemBulk`,
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`SubscribeBulk`, and `UnsubscribeBulk`. These commands are normal unary
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`Invoke` payloads. They do not add separate gRPC methods, and they return a
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`BulkSubscribeReply` containing per-item `SubscribeResult` records with
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`ServerHandle`, `TagAddress`, `ItemHandle`, `WasSuccessful`, and
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`ErrorMessage`.
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The gateway forwards each bulk command as one worker command. The worker runs
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the corresponding MXAccess `AddItem`, `Advise`, `UnAdvise`, and `RemoveItem`
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calls sequentially on the session STA and preserves input order in the result
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list.
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`src/MxGateway.Contracts/Protos/mxaccess_worker.proto` defines the named-pipe
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worker IPC envelope and control messages. It imports
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`mxaccess_gateway.proto` so the worker and gateway use the same command, reply,
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event, value, and status shapes.
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`src/MxGateway.Contracts/Protos/galaxy_repository.proto` defines the
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`GalaxyRepository` service used by clients to browse the Galaxy Repository
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(deployed object hierarchy and dynamic attributes). The service is metadata-
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only and does not share types with `mxaccess_gateway.proto`. See
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[Galaxy Repository Browse](./GalaxyRepository.md) for the RPC catalog and
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behavior.
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Generated C# output is written to `src/MxGateway.Contracts/Generated/`. Do not
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hand-edit generated files.
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Client generation inputs are published through
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`clients/proto/proto-inputs.json` and the descriptor set under
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`clients/proto/descriptors/`. See
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[Client Proto Generation](./client-proto-generation.md) for language-specific
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generation inputs, output directories, and golden protobuf JSON fixtures.
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## Generation
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Run the contracts build to regenerate C# protobuf and gRPC code:
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```bash
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dotnet build src/MxGateway.Contracts/MxGateway.Contracts.csproj
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```
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Run the focused contract tests after changing either `.proto` file:
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```bash
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dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj --filter ProtobufContractRoundTripTests
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```
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The full solution build also regenerates the C# contracts before compiling
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gateway and test projects:
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```bash
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dotnet build src/MxGateway.sln
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```
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Regenerate the client descriptor after changing either `.proto` file:
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```bash
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powershell -ExecutionPolicy Bypass -File scripts/publish-client-proto-inputs.ps1
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```
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## Related Documentation
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- [Client Proto Generation](./client-proto-generation.md)
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- [Gateway Process Detailed Design](./gateway-process-design.md)
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- [MXAccess Worker Instance Detailed Design](./mxaccess-worker-instance-design.md)
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- [Protobuf Style Guide](./style-guides/ProtobufStyleGuide.md)
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