How to know the deeper go-grpc error's name and detect it? Does Go 1.13 helpful?

[dlin]

I'm use go-grpc as communication between client & server program.

When the server killed by manual, the client will get an error, I'm trying to know that situation.

Here is some client code,

 36 var check = func(err error) {

 37         if err != nil {

 38                 panic(err)

 39         }

 40 }

...

145                         } else if err != nil {

146                                 log.Println(fmt.Errorf("decompress: %w\n", err))

147                                 st := conn.GetState()

148                                 if st == connectivity.TransientFailure {  

149                                         log.Println("server may down")

150                                         break

151                                 }

152                                 log.Println("Err: grpc code:", grpc.Code(err),

153                                         "state:", st)

154                                 check(err)

155                         }

panic: rpc error: code = Unavailable desc = transport is closing   // <-- output of line 146

goroutine 1 [running]:

main.glob..func1(0xc47280, 0xc0002060a0)

        /home/rt/cmd/rt_cmd/rt_cmd.go:38 +0x6f

main.main()

        /home/rt/cmd/rt_cmd/rt_cmd.go:153 +0x1537

[guest@tradevm tmp]$ ./rt_cmd -log /mnt/tmp/rt_cmd_f.log :8003 m all

panic: rpc error: code = Unavailable desc = transport is closing

goroutine 1 [running]:

main.glob..func1(0xc47560, 0xc0000ca5f0)

        /home//rt/cmd/rt_cmd/rt_cmd.go:38 +0x6f

main.main()

        /home/dlin/prj/trade.2019rt/f/opt/tools/rt/cmd/rt_cmd/rt_cmd.go:154 +0x15e0

I found it is not easy for me to figure out which error in the output of line 146.

Does any new Go 1.13 Errors functions can help?