Initial check-in for the PowerShell language worker

.gitmodules

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+[submodule "src/protocol/protobuf"]
+	path = src/protocol/protobuf
+	url = https://github.com/Azure/azure-functions-language-worker-protobuf.git

NuGet.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" /> 
+    <add key="dotnet-core" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />
+    <add key="powershell-core" value="https://powershell.myget.org/F/powershell-core/api/v3/index.json" />
+  </packageSources>
+</configuration>

src/PSWorker.cs

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+
+using CommandLine;
+using Grpc.Core;
+using Microsoft.Azure.WebJobs.Script.Grpc.Messages;
+
+namespace Microsoft.Azure.PowerShell.Worker
+{
+    public class WorkerEntry
+    {
+        public static void Main(string[] args)
+        {
+            LanguageWorker worker;
+            Parser.Default.ParseArguments<ArgumentOptions>(args)
+                .WithParsed(ops => worker = new LanguageWorker(ops))
+                .WithNotParsed(err => Environment.Exit(1));
+        }
+    }
+
+    public class ArgumentOptions
+    {
+        [Option("host", Required = true, HelpText = "IP Address used to connect to the Host via gRPC.")]
+        public string Host { get; set; }
+
+        [Option("port", Required = true, HelpText = "Port used to connect to the Host via gRPC.")]
+        public int Port { get; set; }
+
+        [Option("workerId", Required = true, HelpText = "Worker ID assigned to this language worker.")]
+        public string WorkerId { get; set; }
+
+        [Option("requestId", Required = true, HelpText = "Request ID used for gRPC communication with the Host.")]
+        public string RequestId { get; set; }
+
+        [Option("grpcMaxMessageLength", Required = true, HelpText = "gRPC Maximum message size.")]
+        public int MaxMessageLength { get; set; }
+    }
+
+    internal class LanguageWorker
+    {
+        private ArgumentOptions _options;
+        private FunctionRpc.FunctionRpcClient _client;
+        private AsyncDuplexStreamingCall<StreamingMessage, StreamingMessage> _streamingCall;
+
+        internal LanguageWorker(ArgumentOptions options)
+        {
+            var channel = new Channel(options.Host, options.Port, ChannelCredentials.Insecure);
+            _client = new FunctionRpc.FunctionRpcClient(channel);
+            _streamingCall = _client.EventStream();
+            _options = options;
+        }
+    }
+}

src/protocol/FunctionRpcGrpc.cs

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+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: FunctionRpc.proto
+// </auto-generated>
+#pragma warning disable 0414, 1591
+#region Designer generated code
+
+using grpc = global::Grpc.Core;
+
+namespace Microsoft.Azure.WebJobs.Script.Grpc.Messages {
+  /// <summary>
+  /// Interface exported by the server.
+  /// </summary>
+  public static partial class FunctionRpc
+  {
+    static readonly string __ServiceName = "AzureFunctionsRpcMessages.FunctionRpc";
+
+    static readonly grpc::Marshaller<global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage> __Marshaller_StreamingMessage = grpc::Marshallers.Create((arg) => global::Google.Protobuf.MessageExtensions.ToByteArray(arg), global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage.Parser.ParseFrom);
+
+    static readonly grpc::Method<global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage, global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage> __Method_EventStream = new grpc::Method<global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage, global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage>(
+        grpc::MethodType.DuplexStreaming,
+        __ServiceName,
+        "EventStream",
+        __Marshaller_StreamingMessage,
+        __Marshaller_StreamingMessage);
+
+    /// <summary>Service descriptor</summary>
+    public static global::Google.Protobuf.Reflection.ServiceDescriptor Descriptor
+    {
+      get { return global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.FunctionRpcReflection.Descriptor.Services[0]; }
+    }
+
+    /// <summary>Base class for server-side implementations of FunctionRpc</summary>
+    public abstract partial class FunctionRpcBase
+    {
+      public virtual global::System.Threading.Tasks.Task EventStream(grpc::IAsyncStreamReader<global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage> requestStream, grpc::IServerStreamWriter<global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage> responseStream, grpc::ServerCallContext context)
+      {
+        throw new grpc::RpcException(new grpc::Status(grpc::StatusCode.Unimplemented, ""));
+      }
+
+    }
+
+    /// <summary>Client for FunctionRpc</summary>
+    public partial class FunctionRpcClient : grpc::ClientBase<FunctionRpcClient>
+    {
+      /// <summary>Creates a new client for FunctionRpc</summary>
+      /// <param name="channel">The channel to use to make remote calls.</param>
+      public FunctionRpcClient(grpc::Channel channel) : base(channel)
+      {
+      }
+      /// <summary>Creates a new client for FunctionRpc that uses a custom <c>CallInvoker</c>.</summary>
+      /// <param name="callInvoker">The callInvoker to use to make remote calls.</param>
+      public FunctionRpcClient(grpc::CallInvoker callInvoker) : base(callInvoker)
+      {
+      }
+      /// <summary>Protected parameterless constructor to allow creation of test doubles.</summary>
+      protected FunctionRpcClient() : base()
+      {
+      }
+      /// <summary>Protected constructor to allow creation of configured clients.</summary>
+      /// <param name="configuration">The client configuration.</param>
+      protected FunctionRpcClient(ClientBaseConfiguration configuration) : base(configuration)
+      {
+      }
+
+      public virtual grpc::AsyncDuplexStreamingCall<global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage, global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage> EventStream(grpc::Metadata headers = null, global::System.DateTime? deadline = null, global::System.Threading.CancellationToken cancellationToken = default(global::System.Threading.CancellationToken))
+      {
+        return EventStream(new grpc::CallOptions(headers, deadline, cancellationToken));
+      }
+      public virtual grpc::AsyncDuplexStreamingCall<global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage, global::Microsoft.Azure.WebJobs.Script.Grpc.Messages.StreamingMessage> EventStream(grpc::CallOptions options)
+      {
+        return CallInvoker.AsyncDuplexStreamingCall(__Method_EventStream, null, options);
+      }
+      /// <summary>Creates a new instance of client from given <c>ClientBaseConfiguration</c>.</summary>
+      protected override FunctionRpcClient NewInstance(ClientBaseConfiguration configuration)
+      {
+        return new FunctionRpcClient(configuration);
+      }
+    }
+
+    /// <summary>Creates service definition that can be registered with a server</summary>
+    /// <param name="serviceImpl">An object implementing the server-side handling logic.</param>
+    public static grpc::ServerServiceDefinition BindService(FunctionRpcBase serviceImpl)
+    {
+      return grpc::ServerServiceDefinition.CreateBuilder()
+          .AddMethod(__Method_EventStream, serviceImpl.EventStream).Build();
+    }
+
+  }
+}
+#endregion

src/protocol/protobuf

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+Subproject commit 58b3dc0dbde065b15bd979bd2e27f36b7ee6273e

src/psworker.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <RootNamespace>Microsoft.Azure.PowerShell.Worker</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Grpc" Version="1.13.1" />
+    <PackageReference Include="Google.Protobuf" Version="3.6.0" />
+    <PackageReference Include="CommandLineParser" Version="2.2.1" />
+    <PackageReference Include="Microsoft.Azure.WebJobs" Version="3.0.0-beta5" />
+    <PackageReference Include="Microsoft.PowerShell.SDK" Version="6.1.0-preview.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="..\worker.config.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

worker.config.json

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+{
+    "Description":{
+        "Language":"powershell",
+        "Extension":".ps1",
+        "DefaultExecutablePath":"C:\\Users\\dongbow\\AppData\\Local\\Microsoft\\dotnet\\dotnet.exe",
+        "DefaultWorkerPath":"psworker.dll"
+    }
+}