go proto指定import路径
proto文件在import依赖包。需要在proto命令生成文件时，指明import的包的路径
demo：
syntax = "proto3";
package gateway;
import "google/api/annotations.proto";
message Message {
string msg = 1;
}
service Gateway {
rpc Echo (Message) returns (Message) {
option (google.api.http) = {
post: "/api/v1/echo"
body: "*"
};
}
}
执行命令：
protoc --grpc-gateway_out=logtostderr=true:. gateway.proto
报错：
google/api/annotations.proto: File not found.
gateway.proto: Import "google/api/annotations.proto" was not found or had errors.
protoc -I . -I $GOPATH/pkg/mod/github.com/grpc-ecosystem/grpc-gateway@v1.9.6/third_party/googleapis --grpc-gateway_out=logtostderr=true:. gateway.proto
