grpc-swift | The Swift language implementation of gRPC
kandi X-RAY | grpc-swift Summary
kandi X-RAY | grpc-swift Summary
This repository contains a gRPC Swift API and code generator. It is intended for use with Apple's SwiftProtobuf support for Protocol Buffers. Both projects contain code generation plugins for protoc, Google's Protocol Buffer compiler, and both contain libraries of supporting code that is needed to build and run the generated code. APIs and generated code is provided for both gRPC clients and servers, and can be built either with Xcode or the Swift Package Manager. Support is provided for all four gRPC API styles (Unary, Server Streaming, Client Streaming, and Bidirectional Streaming) and connections can be made either over secure (TLS) or insecure channels.
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QUESTION
Trying to analyze the syntax of following Swift code snippet. I am not concerned with the larger semantics, but if you want more context you can look here. I am particularly interested in the use of .with
which is some pattern I am not familiar with. Can anyone parse this and break it down for me?
ANSWER
Answered 2021-Feb-11 at 22:57The phrase let note: Routeguide_RouteNote
tells Swift that what is on the far side of the upcoming equals sign will be a Routeguide_RouteNote
.
This type conforms to SwiftProtobuf.Message
.
Thus it has a static method called with
that returns Self
, i.e. in this case, a Routeguide_RouteNote
instance.
Thus, thanks to the declared type, we can call that method by saying .with
instead of saying Routeguide_RouteNote.with
.
NOTE This is due to a highly specialized rule in Swift that if a static/class func
MyType.myFunc
returns a MyType instance, then if the compiler already knows that this is a MyType, you can omitMyType
when you call the func, i.e. you can call.myFunc()
instead ofMyType.myFunc()
.It's exactly the same rule that allows you to set a view
backgroundColor
to.red
instead of having to sayUIColor.red
. The compiler knows this will be a UIColor, so, looking at the rule more generally, any UIColor static/class member that yields a UIColor can be used without sayingUIColor
explicitly.
The .with
function takes a function parameter which is expressed as an anonymous function in trailing closure syntax, and you're done.
QUESTION
I am trying to access Google Cloud Storage using the Swift programming language. Unfortunately, Google does not offer a client library for Swift. If Cloud Storage exposed a gRPC endpoint, I could simply "generate my own" using SwiftGRPC.
Therefore, does Google Cloud Storage offer a gRPC endpoint, and if so, where could I find the service's definition file in protobuf
format?
ANSWER
Answered 2019-May-10 at 15:20Google Cloud Storage does not have a gRPC endpoint at this time.
QUESTION
I'm using the Swift gRPC library (which curiously isn't listed on gRPC's website, but there is a GitHub repo for it) to build an implementation of the Google Assistant SDK for macOS. I've gotten my OAuth2 credentials and token, and am trying to make the initial request to begin a conversation, however it fails to do so.
I always get the error Google_Assistant_Embedded_V1Alpha1_EmbeddedAssistantClientError error 1.)
and gRPC.CallError error 1.
I ran Wireshark to try and debug the issue, and I saw the my computer is attempting to establish a connection but eventually ends up aborting the connection. I think it may be due to a TLS issue, but I'm not sure if that actually is the case or how to fix it.
I noticed the service initialization function has an overload where you specify certificates, but I don't know what to put there (or if that function needs to be used at all)
...ANSWER
Answered 2017-May-07 at 19:44I don't know Swift, and your Wireshark screen shot may be masking important information, but I believe one or both of the following may be the problem:
Constants.ASSISTANT_API_ENDPOINT
needs to be set to "embeddedassistant.googleapis.com". (It isn't clear, but I don't think the destination address shown in Wireshark is the API endpoint, which it should be.)Constants.AUTH_TOKEN_KEY
should be the auth token that you've gotten as part of the OAuth2 dance. Keep in mind that it expires (usually after an hour) and you'll need to get a new one. I don't know how Swift configuration works for it, but in others you don't need to specify the "Bearer" part of the auth information since you're not passing the header specifically.
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