英文:
How to extract path from user request in golang grpc-gateway
问题
我有一个问题。是否可以从用户请求中提取元数据路径？
这是我的proto文件，其中定义了一个方法。
rpc AllPath(google.protobuf.Empty) returns (google.protobuf.Empty) {
option (google.api.http) = {
get: "/*",
};
}
rpc Auth(google.protobuf.Empty) returns (TokenRender) {
option (google.api.http) = {
get: "/auth"
};
}
在我的服务器文件中的AllPath函数中，我使用了grpc-gateway生态系统网站上找到的类似以下的代码。
path := make(map[string]string)
if pattern, ok := runtime.HTTPPathPattern(ctx); ok {
path["pattern"] = pattern // /v1/example/login
}
fmt.Printf("当前路径为：%v", path["pattern"])
但是我的当前模式/路径就像我在proto文件中定义的那样：当前路径为：/*
如果有人知道如何处理这个问题，我将不胜感激 
最好，Kacper
英文:
i have a question. Is it possible to extract via metadata path from user request.
Here i have my proto file with defined method.
rpc AllPath(google.protobuf.Empty) returns (google.protobuf.Empty) {
option (google.api.http) = {
get: "/*",
};
}
rpc Auth(google.protobuf.Empty) returns (TokenRender) {
option (google.api.http) = {
get: "/auth"
};
}
}
In AllPath function in my server file im using something like this, found on grpc-gateway ecosystem website.
path := make(map[string]string)
if pattern, ok := runtime.HTTPPathPattern(ctx); ok {
path["pattern"] = pattern // /v1/example/login
}
fmt.Printf("Current path is: %v", path["pattern"])
but my current pattern/path is like i defined in proto file: Current path is: /*
If anyone have idea how to deal with this thing i would appreciate it
Best, Kacper
答案1
得分: 2
gRPC-Gateway通过gRPC元数据从原始的HTTP请求中传递各种信息。然而，我不认为原始路径是被提供的。但是，仍然可以通过注册一个元数据注解器来获取传递的路径。
在调用github.com/grpc-ecosystem/grpc-gateway/v2/runtime.NewServeMux()时，可以利用WithMetadata选项函数：
mux := runtime.NewServeMux(runtime.WithMetadata(func(_ context.Context, req *http.Request) metadata.MD {
return metadata.New(map[string]string{
"grpcgateway-http-path": req.URL.Path,
})
}))
然后在你的gRPC服务实现中，可以通过传入的上下文检索该值：
func (s *server) AllPath(ctx context.Context, _ *emptypb.Empty) (*emptypb.Empty, error) {
md, _ := metadata.FromIncomingContext(ctx)
log.Printf("path: %s", md["grpcgateway-http-path"][0])
return &emptypb.Empty{}, nil
}
当访问/foo时，这将记录：
2022/10/25 15:31:42 path: /foo
英文:
gRPC-Gateway passes various bits of information from the originating HTTP request via gRPC metadata. I don't believe the raw path is supplied, however. It is still possible to get the path passed through by registering a metadata annotator.
When calling github.com/grpc-ecosystem/grpc-gateway/v2/runtime.NewServeMux(), leverage the WithMetadata option func:
mux := runtime.NewServeMux(runtime.WithMetadata(func(_ context.Context, req *http.Request) metadata.MD {
return metadata.New(map[string]string{
"grpcgateway-http-path": req.URL.Path,
})
}))
Then in your gRPC service implementation, you can retrieve the value via the incoming context:
func (s *server) AllPath(ctx context.Context, _ *emptypb.Empty) (*emptypb.Empty, error) {
md, _ := metadata.FromIncomingContext(ctx)
log.Printf("path: %s", md["grpcgateway-http-path"][0])
return &emptypb.Empty{}, nil
}
When hitting, e.g. /foo, this should log:
2022/10/25 15:31:42 path: /foo
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