| #region Copyright notice and license |
| |
| // Copyright 2015 gRPC authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #endregion |
| |
| using System; |
| using System.IO; |
| using System.Reflection; |
| |
| using Grpc.Core.Logging; |
| |
| namespace Grpc.Core.Internal |
| { |
| /// <summary> |
| /// Takes care of loading C# native extension and provides access to PInvoke calls the library exports. |
| /// </summary> |
| internal sealed class NativeExtension |
| { |
| static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<NativeExtension>(); |
| static readonly object staticLock = new object(); |
| static volatile NativeExtension instance; |
| |
| readonly NativeMethods nativeMethods; |
| |
| private NativeExtension() |
| { |
| this.nativeMethods = LoadNativeMethods(); |
| |
| // Redirect the native logs as the very first thing after loading the native extension |
| // to make sure we don't lose any logs. |
| NativeLogRedirector.Redirect(this.nativeMethods); |
| |
| DefaultSslRootsOverride.Override(this.nativeMethods); |
| |
| Logger.Debug("gRPC native library loaded successfully."); |
| } |
| |
| /// <summary> |
| /// Gets singleton instance of this class. |
| /// The native extension is loaded when called for the first time. |
| /// </summary> |
| public static NativeExtension Get() |
| { |
| if (instance == null) |
| { |
| lock (staticLock) |
| { |
| if (instance == null) { |
| instance = new NativeExtension(); |
| } |
| } |
| } |
| return instance; |
| } |
| |
| /// <summary> |
| /// Provides access to the exported native methods. |
| /// </summary> |
| public NativeMethods NativeMethods |
| { |
| get { return this.nativeMethods; } |
| } |
| |
| /// <summary> |
| /// Detects which configuration of native extension to load and load it. |
| /// </summary> |
| private static UnmanagedLibrary LoadUnmanagedLibrary() |
| { |
| // TODO: allow customizing path to native extension (possibly through exposing a GrpcEnvironment property). |
| // See https://github.com/grpc/grpc/pull/7303 for one option. |
| var assemblyDirectory = Path.GetDirectoryName(GetAssemblyPath()); |
| |
| // With old-style VS projects, the native libraries get copied using a .targets rule to the build output folder |
| // alongside the compiled assembly. |
| // With dotnet cli projects targeting net45 framework, the native libraries (just the required ones) |
| // are similarly copied to the built output folder, through the magic of Microsoft.NETCore.Platforms. |
| var classicPath = Path.Combine(assemblyDirectory, GetNativeLibraryFilename()); |
| |
| // With dotnet cli project targeting netcoreapp1.0, projects will use Grpc.Core assembly directly in the location where it got restored |
| // by nuget. We locate the native libraries based on known structure of Grpc.Core nuget package. |
| // When "dotnet publish" is used, the runtimes directory is copied next to the published assemblies. |
| string runtimesDirectory = string.Format("runtimes/{0}/native", GetPlatformString()); |
| var netCorePublishedAppStylePath = Path.Combine(assemblyDirectory, runtimesDirectory, GetNativeLibraryFilename()); |
| var netCoreAppStylePath = Path.Combine(assemblyDirectory, "../..", runtimesDirectory, GetNativeLibraryFilename()); |
| |
| // Look for the native library in all possible locations in given order. |
| string[] paths = new[] { classicPath, netCorePublishedAppStylePath, netCoreAppStylePath}; |
| return new UnmanagedLibrary(paths); |
| } |
| |
| /// <summary> |
| /// Loads native extension and return native methods delegates. |
| /// </summary> |
| private static NativeMethods LoadNativeMethods() |
| { |
| return PlatformApis.IsUnity ? LoadNativeMethodsUnity() : new NativeMethods(LoadUnmanagedLibrary()); |
| } |
| |
| /// <summary> |
| /// Return native method delegates when running on Unity platform. |
| /// Unity does not use standard NuGet packages and the native library is treated |
| /// there as a "native plugin" which is (provided it has the right metadata) |
| /// automatically made available to <c>[DllImport]</c> loading logic. |
| /// WARNING: Unity support is experimental and work-in-progress. Don't expect it to work. |
| /// </summary> |
| private static NativeMethods LoadNativeMethodsUnity() |
| { |
| switch (PlatformApis.GetUnityRuntimePlatform()) |
| { |
| case "IPhonePlayer": |
| return new NativeMethods(new NativeMethods.DllImportsFromStaticLib()); |
| default: |
| // most other platforms load unity plugins as a shared library |
| return new NativeMethods(new NativeMethods.DllImportsFromSharedLib()); |
| } |
| } |
| |
| private static string GetAssemblyPath() |
| { |
| var assembly = typeof(NativeExtension).GetTypeInfo().Assembly; |
| #if NETSTANDARD1_5 |
| // Assembly.EscapedCodeBase does not exist under CoreCLR, but assemblies imported from a nuget package |
| // don't seem to be shadowed by DNX-based projects at all. |
| return assembly.Location; |
| #else |
| // If assembly is shadowed (e.g. in a webapp), EscapedCodeBase is pointing |
| // to the original location of the assembly, and Location is pointing |
| // to the shadow copy. We care about the original location because |
| // the native dlls don't get shadowed. |
| |
| var escapedCodeBase = assembly.EscapedCodeBase; |
| if (IsFileUri(escapedCodeBase)) |
| { |
| return new Uri(escapedCodeBase).LocalPath; |
| } |
| return assembly.Location; |
| #endif |
| } |
| |
| #if !NETSTANDARD1_5 |
| private static bool IsFileUri(string uri) |
| { |
| return uri.ToLowerInvariant().StartsWith(Uri.UriSchemeFile); |
| } |
| #endif |
| |
| private static string GetPlatformString() |
| { |
| if (PlatformApis.IsWindows) |
| { |
| return "win"; |
| } |
| if (PlatformApis.IsLinux) |
| { |
| return "linux"; |
| } |
| if (PlatformApis.IsMacOSX) |
| { |
| return "osx"; |
| } |
| throw new InvalidOperationException("Unsupported platform."); |
| } |
| |
| // Currently, only Intel platform is supported. |
| private static string GetArchitectureString() |
| { |
| if (PlatformApis.Is64Bit) |
| { |
| return "x64"; |
| } |
| else |
| { |
| return "x86"; |
| } |
| } |
| |
| // platform specific file name of the extension library |
| private static string GetNativeLibraryFilename() |
| { |
| string architecture = GetArchitectureString(); |
| if (PlatformApis.IsWindows) |
| { |
| return string.Format("grpc_csharp_ext.{0}.dll", architecture); |
| } |
| if (PlatformApis.IsLinux) |
| { |
| return string.Format("libgrpc_csharp_ext.{0}.so", architecture); |
| } |
| if (PlatformApis.IsMacOSX) |
| { |
| return string.Format("libgrpc_csharp_ext.{0}.dylib", architecture); |
| } |
| throw new InvalidOperationException("Unsupported platform."); |
| } |
| } |
| } |