英文:
Create variable of type Map[string]interface{} in gRPC protoc buffer golang
问题
我正在使用gRPC的Go语言实现来实现客户端和服务器应用程序之间的通信。
以下是protoc buffer的代码。
syntax = "proto3";
package Trail;
service TrailFunc {
rpc HelloWorld (Request) returns (Reply) {}
}
// The request message containing the user's name.
message Request {
map<string,string> inputVar = 1;
}
// The response message containing the greetings
message Reply {
string outputVar = 1;
}
我需要在消息数据结构中创建一个类型为map[string]interface{}的inputVar字段，而不是map[string]string。我该如何实现呢？
提前感谢。
英文:
I'm using grpc golang to communicate between client and server application.
Below is the code for protoc buffer.
syntax = "proto3";
package Trail;
service TrailFunc {
rpc HelloWorld (Request) returns (Reply) {}
}
// The request message containing the user's name.
message Request {
map<string,string> inputVar = 1;
}
// The response message containing the greetings
message Reply {
string outputVar = 1;
}
I need to create a field inputVar of type map[string]interface{} inside message data structure instead of map[string]string.
How can I achieve it?
Thanks in advance.
答案1
得分: 21
proto3中有一个类型为Any的字段。
import "google/protobuf/any.proto";
message ErrorStatus {
string message = 1;
repeated google.protobuf.Any details = 2;
}
但是如果你查看它的实现，它只是简单地定义了如下的消息类型：
message Any {
string type_url = 1;
bytes value = 2;
}
你需要自己定义这样一个消息类型，可能需要使用反射和一个中间类型。
参考示例应用。
https://github.com/golang/protobuf/issues/60
英文:
proto3 has type Any
import "google/protobuf/any.proto";
message ErrorStatus {
string message = 1;
repeated google.protobuf.Any details = 2;
}
but if you look at its implementation, it is simply as
message Any {
string type_url = 1;
bytes value = 2;
}
You have to define such a message yourself by possibly using reflection and an intermediate type.
答案2
得分: 12
我写了一篇更长的帖子，介绍如何使用google.protobuf.Struct来处理任意的JSON输入。structpb包可以通过其AsMap()函数从structpb.Struct生成一个map[string]interface{}。
官方文档：https://pkg.go.dev/google.golang.org/protobuf/types/known/structpb
英文:
I wrote a longer post about how to use google.protobuf.Struct to work with arbitrary JSON input. The structpb package capable to produce a map[string]interface{} from a structpb.Struct via its AsMap() function.
Official documentation: https://pkg.go.dev/google.golang.org/protobuf/types/known/structpb
答案3
得分: 4
尽管处理起来有点冗长，但协议缓冲区中的"struct"类型可能更接近于Go语言的map[string]interface{}。
但是，与interface{}一样，需要一些反射式的开销来确定实际存储的类型。
例如，请参见此处的评论：https://github.com/golang/protobuf/issues/370
英文:
While it gets a little verbose to deal with, the "struct" type in protocol buffers is probably closer to golang's map[string]interface{}
But like interface{} will take some reflection-style overhead to determine what the actual stored type is.
for example see comment here: https://github.com/golang/protobuf/issues/370
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