I set up a series of gRPC requests and responses which all work fine, but I'm stuck when I try to get the client IP address and user-agent who is calling my gRPC APIs.
I read the Go gRPC documentation and other sources, but didn't find much valuable information. Few of them are talking about gRPC in Golang.
Should I set up a key-value to store the IP address in the context when setting up the gRPC APIs?
In Golang GRPC, you can use
func (UserServicesServer) Login(ctx context.Context, request *sso.LoginRequest) (*sso.LoginResponse, error) {
p, _ := peer.FromContext(ctx)
request.Frontendip = p.Addr.String()
.
.
}
But, do not forget import "google.golang.org/grpc/peer"
For grpc-gateway is used, the client IP address may be retrieved through x-forwarded-for like this:
// Get IP from GRPC context
func GetIP(ctx context.Context) string {
if headers, ok := metadata.FromIncomingContext(ctx); ok {
xForwardFor := headers.Get("x-forwarded-for")
if len(xForwardFor) > 0 && xForwardFor[0] != "" {
ips := strings.Split(xForwardFor[0], ",")
if len(ips) > 0 {
clientIp := ips[0]
return clientIp
}
}
}
return ""
}
In Golang GRPC, context has 3 values
authority
content-type
user-agent
md,ok:=metadata.FromIncomingContext(ctx)
fmt.Printf("%+v%+v",md,ok)
