An iOS Swift Client using a BFF (Backend for Frontend) service implemented in Node.js to simplify access to Pokemon APIs exposed on https://pokeapi.co
https://medium.com/@JMangia/grpc-bff-for-swift-ios-app-d5f6718a545
The BFF Node.js sercvice is implemented in two different flavors exposing REST or GRPC interfaces.
The REST BFF version use classic Promise/Future and use a in process memory cache to optimize responsiveness.
The GRPC BFF version use Async/Await and GRPC (HTTP/2) streaming capabilities to optimize responsiveness.
The client Swift iOS App consume the BFF services to search and display Pokemon info.
As the BFF service also the Swift client App is implemented in two different flavors using respectlivly REST or GRPC networking.
The REST Swift client use Codable protocol and URLSession to easily implement the REST client calls.
The GRPC Swift client use Swift GRPC stack.
If you waant customize the GRPC/proto interface file please follow the instructions on https://github.com/grpc/grpc-swift about how to install the Protocol Buffer Compiler, build SwiftGRPC and install the protoc-gen-swift and the protoc-gen-swiftgrpc plugin.
The SwiftGRPC and depency libraries are added to the XCode project using CocoaPod.
The generated Swift protobuf and grpc files are included in this repo so in order to build and test this sample you only need to run pod install
- run
npm installto install node dependencies - run
node server.jsto start the BFF server
- run
pod installto install Swift GRPC dependencies - open the solution in Xcode
- update the GRPC endpoint in the Info.plist (GRPC_Address field) file according to where you are running the GRPC BFF
- build and run on simulator or device
In order to run the BFF GRPC service on your workstation and being able to run the app on iPhone devices you need to connect the client and the server using a tcp tunnel solution.
- install ngrok from https://ngrok.com
- run
ngrok tcp 50051 - updtate the client GRPC endpoint in the Info.plist (GRPC_Address field)