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gRPC Java Client - hasNext during onNext?


gRPC Java Client - hasNext during onNext?

By : nanangitak
Date : October 21 2020, 08:10 PM
it fixes the issue There's no API to determine if additional messages have been received, but not yet delivered to the application.
The client-side stub API (e.g., StreamObserver) is implemented using the more advanced ClientCall/ClientCall.Listener API. It does not provide any received-but-not-delivered hint.
code :


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GRPC client onNext does not fail if there is no server

GRPC client onNext does not fail if there is no server


By : anup
Date : March 29 2020, 07:55 AM
it helps some times This is the intended behavior. As you mentioned the API is asynchronous and so errors must generally be asynchronous as well. gRPC does not guarantee message delivery and in the case of a streaming RPC failure does not indicate which messages were received by the remote side. The advanced ClientCall API calls this out.
If you need stronger guarantees it must be added at the application-level, such as with replies or with a Status of OK. As an example, in gRPC + Image Upload I mention using a bidirectional stream for acknowledgements.
Grpc: Grpc C++ client and Grpc java server, asynchronous bidirectional stream

Grpc: Grpc C++ client and Grpc java server, asynchronous bidirectional stream


By : Jie Li
Date : March 29 2020, 07:55 AM
it helps some times I am trying to write a cpp client for a bi-directional stream api. , This issue was because of difference in protobuf version.
How to send trailing metadata from python gRPC service to grpc-web client?

How to send trailing metadata from python gRPC service to grpc-web client?


By : user2893664
Date : March 29 2020, 07:55 AM
Hope that helps Before calling method set_trailing_metadata, you need to call send_initial_metadata with same medatdata keys but any values.
In my case it will looks like this:
code :
class Greeter(helloworld_pb2_grpc.GreeterServicer):
    def SayHello(self, request, context):
        context.send_initial_metadata((
            ('checksum', ''),
            ('retry', ''),
        ))
        context.set_trailing_metadata((
            ('checksum', 'I agree'),
            ('retry', 'false'),
        ))
        return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)
gRPC client: error in compiled file (io.grpc.protobuf does not exist)

gRPC client: error in compiled file (io.grpc.protobuf does not exist)


By : user3413592
Date : March 29 2020, 07:55 AM
may help you . Android uses Protobuf Lite, which is a subset of the normal implementation and optimized for Android. You correctly tried to depend on io.grpc:grpc-protobuf-lite:1.25.0. This provides the io.grpc.protobuf.lite package.
You also correctly configured protoc to generate protobuf-lite messages. However, the grpc plugin is generating "full" protobuf services. That's why you're seeing references to io.grpc.protobuf and classes missing in protobuf like com.google.protobuf.Descriptors.
code :
protobuf {
    ...
    generateProtoTasks {
        all().each { task ->
                ...
                task.plugins {
                    grpc {
                        outputSubDir = 'java'
                        option 'lite' // Needed this line
                    }
                }
        }
    }
}
dependencies {
    ...
    implementation ('io.grpc:grpc-protobuf-lite:1.25.0') {
        // Exclude will not be necessary starting in grpc 1.26
        exclude group: 'com.google.protobuf', module: 'protobuf-lite'
    }
}
How to make gRPC client comunicate with a gRPC server in a different machine? Both in Aspnet Core 3.0. Possible SSL prob

How to make gRPC client comunicate with a gRPC server in a different machine? Both in Aspnet Core 3.0. Possible SSL prob


By : user3511362
Date : March 29 2020, 07:55 AM
help you fix your problem After a great research and many messages exchanged in Issues at Microsoft official GitHub Repository for .Net Core kestrel documentation i found it.
It can be done with this settings on appsettings.json
code :
{
  "Logging": {
    "LogLevel": {
      "Default": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "Kestrel": {
    "EndpointDefaults": {
      "Protocols": "Http2"
    },
    "EndPoints": {
      "Https": {
        "Url": "https://*:5002",
        "Certificate": {
          "Path": "c:\\test.pfx",
          "Password": "password1234"
        }
      }
    }
  },
}
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