Orleans.HttpGateway.AspNetCore

a http gateway for Microsoft Orleans.

Installation

Install-Package Orleans.HttpGateway.AspNetCore

Configuring the gateway

Startup.cs

public void ConfigureService(IServiceCollection services)
{
    // add known grain interface assemblies
    Assembly grainInterfaceAssembly = GetGrainInterfacesAssembly();
    services.AddOrleansHttpGateway(c => c.AddAssemblies(grainInterfaceAssembly));

    // ensure IGrainFactory is registered in the service container
    services.AddSingleton<IGrainFactory>(GetGrainFactory());
}

public void Configure(IApplicationBuilder app)
{
    // register the middleware in the application
    // note: the middleware internally uses Microsoft.AspNetCore.Routing
    // default route is: "{grainInterface}/{grainId}/{grainMethod}"
    app.UseOrleansHttpGateway();
}

IMPORTANT: Please note that ALL grains are accessible with this gateway, it is adviceable to not publicly expose the endpoint and use any of the default methods to securing your web app

Calling grains with http client

Grainmethods can be invoked using the following url format

http://your.aspnet.url/{grainInterface}/{grainId}/{grainMethod}

example: http://localhost:5000/Orleans.HttpGateway.AspNetCore.Tests.ITestGrain3/6/GetObjectWith2Parameters?one=1&two=okay

Providing method parameters

given the following grain interface:

public interface ITestGrain : IGrainWithStringKey
{
    Task<int> TestGrainMethod(string p1, bool p2, string[]p3);
}

parameters can be supplied by QueryParameters for GET requests, e.g. ?p1=one&p2=true&p3=[a,b,c]

complex parameters can also be provided in the request body using PUT or POST, names of the root elements must match the variable names in the GrainInterface and contenttype must be application/json:

{
    "p1":"one",
    "p2":true,
    "p3": ["a","b","c"]
}

note: not supplied values will default to null in the resulting grain call

Using Compound Grain Keys

Compound keys can be provided, seperated with a , e.g for an IGrainWithIntegerCompoundKey: http://localhost:5000/Orleans.HttpGateway.AspNetCore.Tests.ITestGrain3/1234,myStringkey/GetObjectWith2Parameters?one=1&two=okay

Acknowledgements

this project uses ObjectMethodExecutor from https://github.com/aspnet/Common/tree/dev/shared/Microsoft.Extensions.ObjectMethodExecutor.Sources