grpc-swift

• Add more channel arguments (@SebastianThiebaud)
• Add casts to fix warnings about ints used as void *. (@timburks)
• README updates (@rebello95)
• Fix memory leaks (@MrMage)
• Avoid a try! call (@MrMage)
• Make the test stubs thread safe (@MrMage)
• Leave zlib dependency only for non-Apple platforms (@MrMage)
• Add CocoaPods-based sample (@timburks)
• Fix broken link (@koichi.tanaka)
• Spin up dedicated queues for some operations (@MrMage)
• Dispatch the actual request handlers on new threads (@MrMage)
• Remove several now-unused DispatchQueue arguments (@MrMage)
• Make the server dispatch each request handler on its own thread (@MrMage)
• Streamline the interface of the server-side response handling code (@MrMage)
• Fix several completion queue leaks in tests (@MrMage)
• Add server/client codegen options to protoc (@rebello95)
• Add docs for protoc parameter usage (@rebello95)

This release contains a large set of improvements led by @MrMage that improve error visibility and the structure of generated code. The Swift gRPC core now consists of two parts, a "Core" that provides basic services and a "Runtime" that contains code factored out of previously-generated code. With these changes, generated code is much lighter and easier to generate. To reduce dependencies, protoc-gen-swiftgrpc was rewritten to directly "print" generated code, and this simplification allowed us to move the plugin to the main Package.swift.

There are other pending improvements coming soon as patch version updates.

Improvements made during prototyping of a Swift webserver-to-gRPC proxy.

CountDownLatch was removed and replaced with DispatchSemaphore.

This update adds a dependency on SwiftProtobufPluginLibrary with the goal of using the SwiftProtobufNamer class to generate names that are consistent with the ones used by the Swift Protobuf project. Currently only message names are affected.

It also manually imports code used to determine file names for generated code to allow the default path names of files generated by protoc-gen-swiftgrpc to be more consistent with those from protoc-gen-swift.

Previous versions required a separate "roots.pem" file to be loaded to initialize secure connections. Now this file is built into the library binary (see Sources/gRPC/Roots.swift) so clients no longer have to worry about providing this file.

In a related simplification, the Channel constructor now takes an optional "secure" argument whose default value is true. Note that this will break code that calls the Channel constructor with just an address since previously that created insecure connections. To get an insecure channel, add "secure:false" to your Channel constructor.

This release moves from Swift 3 to Swift 4. The update required changes to the modulemap for CgRPC that could break Swift 3 builds. If you still need to build with Swift 3, add the following line to the modulemap:

link "CgRPC"

See the change for more details.

The vendored gRPC is now v1.6.0, and the grpc-swift C shim layer compiles with versions of gRPC at least as far back as v1.4.5.

Libz is now included as a source package that is built by the Swift Package Manager. This removes the need to add -lz to Package Manager builds of grpc-swift clients.