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Using Json Rpc Standalone

One of the benefits of the JSON-RPC protocol is that communication can be fully bi-directional. Through some sort of interface agreement, like LSP / DAP, both sides can act as both client (sender) and server (reciever).

Creating a JsonRpcServer

JsonRpcServer can be created through two methods.

Standalone

JsonRpcServer.Create(options => {}) This will create a server where you provide options, handlers and more. An optional IServiceProvider can be provided that will be used as a fallback container when IJsonRcpHandlers are being resolved.

Microsoft.Extensions.DependencyInjection

services.AddJsonRpcServer([string name, ], options => {}) This will add JsonRpcServer to your service collection, or any number of named JsonRpcServers.

  • In the event that you add multiple named servers, they must be resolved using JsonRpcServerResolver.

When created through Microsoft DI the server will use the IServiceProvider as a fallback when resolving IJsonRpcHandlers.

Options

Some of the important options include...

  • options.WithInput() takes an input Stream or PipeReader
  • options.WithOutput() takes an output Stream or PipeWriter
  • options.WithAssemblies() takes additional assemblies that will participate in scanning operations.
    • Sometimes we scan this list of assemblies for potential strongly typed requests and notifications
  • options.AddHandler allows you to add handlers that implement IJsonRpcNotificationHandler<>, IJsonRpcRequestHandler<>, IJsonRpcRequestHandler<,>.
    • Handlers can be added as an instance, type or a factory that is given a IServiceProvider
  • options.OnNotification / options.OnRequest
    • These methods can be used to create handler delegates without having to implement the request interfaces.
  • options.OnJsonNotification / options.OnJsonRequest
    • These methods can be used to create handler delegates without having to implement the request interfaces.
    • These json JToken an the request / response types.
  • options.WithMaximumRequestTimeout()
    • Sets the maximum timeout before a request is cancelled
    • Defaults to 5 minutes
  • options.WithSupportsContentModified()
    • Sets the into a special model that is used more for Language Server Protocol.
    • In this mode any Serial request will cause any outstanding Parallel requests will be cancelled with an error message.
  • options.WithRequestProcessIdentifier()
    • This allows you to control how requests are "identified" or how they will behave (Serial / Parallel)

Testing

We have some helper classes that can be used to aid in Unit Testing such as JsonRpcServerTestBase.

Handlers

Handlers can be implemented as classes that implement IJsonRpcNotificationHandler<>, IJsonRpcRequestHandler<>, IJsonRpcRequestHandler<,> or as delegates on the JsonRpcServer itself.

Additionally handlers can be dynamically added and removed after the server has been initialized by using the registry.

server.Register(registry => {}) will return an IDisposable that can be used to remove all the handlers that were registered at that time.