CODEWITHSUNDEEP
grpcgrpc-java
Moutabreath
Moutabreath

Reputation: 196

Generate grpc java client

I am trying to compile my proto into a grpc java client and a python grpc java server. I can't get the java generated class to produce the Services. The following is proto named 'myproto.proto:

syntax = "proto3";

package amat.metrology_setup.api.services.generic_measurement;
option java_package  = "amat.metrology_setup.api.services.generic_measurement";

message AlLData {
  map<string, SingleData> map_data = 1;
}
message SingleData{
  map<string, string> params = 1;
}
message Empty{

}
service Updaer {
  rpc SendData(AlLData) returns (Empty);
  rpc GetUpdatedData(Empty) returns (AlLData);
}

Python works well, but the java cannot geneate the matching Updaer. I've read that without the protoc-gen-grpc-java plugin it is expected not to generate services. Like this:

$protoc -I=$SRC_DIR --java_out=$DST_DIR $SRC_DIR/my_proto.proto

I know that I need grpc pluginprotoc-gen-grpc-java to generate the services and that wit

So i've done:

$protoc -I=$SRC_DIR --java_out=$DST_DIR --plugin=protoc-gen-grpc-java=$grpc_java_plugin $proto_file

But I still can't get the services to be compiled. All the paths are valid because the file is being compiled. what am I missing?

Upvotes: 0

Views: 448

Answers (1)

DazWilkin
DazWilkin

Reputation: 40326

I'm running Linux AMD64 and:

  1. created your myproto.proto (including the typo in the service name Updaer) and;
  2. downloaded protoc-gen-grpc-java from Maven.
  3. ran protoc1 command as described in the comments

1 As mentioned, for Java, protoc is commonly invoked using Maven, Gradle ...

ARCH="linux-x86_64"
VERS="1.64.0"

PLUGIN="protoc-gen-grpc-java-${VERS}-${ARCH}.exe"

wget \
  https://repo1.maven.org/maven2/io/grpc/protoc-gen-grpc-java/${VERS}/${PLUGIN}

chmod +x ${PLUGIN}

Before:

.
├── myproto.proto
└── protoc-gen-grpc-java-1.64.0-linux-x86_64.exe

Then, I used the command as I described in the comment:

protoc \
--plugin=protoc-gen-grpc-java=${PLUGIN} \
--proto_path=${PWD} \
--java_out=${PWD} \
--grpc-java_out=${PWD} \
${PWD}/myproto.proto

After:

.
├── amat
│   └── metrology_setup
│       └── api
│           └── services
│               └── generic_measurement
│                   ├── Myproto.java
│                   └── UpdaerGrpc.java
├── myproto.proto
└── protoc-gen-grpc-java-1.64.0-linux-x86_64.exe

Upvotes: 0

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