From 611de5f9fd809b22d33ff9094c4d2f8426b6dac0 Mon Sep 17 00:00:00 2001
From: Alex Shtin <alex@temporal.io>
Date: Tue, 31 Mar 2020 16:01:58 -0700
Subject: [PATCH] Add Unimplemented error (#5)

---
 serviceerror/convert.go       |  3 +-
 serviceerror/unimplemented.go | 63 +++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 serviceerror/unimplemented.go

diff --git a/serviceerror/convert.go b/serviceerror/convert.go
index 87d86508..5b90224b 100644
--- a/serviceerror/convert.go
+++ b/serviceerror/convert.go
@@ -77,12 +77,13 @@ func FromStatus(st *status.Status) error {
 		return newCanceled(st)
 	case codes.Unavailable:
 		return newUnavailable(st)
+	case codes.Unimplemented:
+		return newUnimplemented(st)
 	case codes.Unknown:
 		// Unwrap error message from unknown error.
 		return errors.New(st.Message())
 	// Unsupported codes.
 	case codes.OutOfRange,
-		codes.Unimplemented,
 		codes.Unauthenticated:
 		// Use standard gRPC error representation for unsupported codes ("rpc error: code = %s desc = %s").
 		return st.Err()
diff --git a/serviceerror/unimplemented.go b/serviceerror/unimplemented.go
new file mode 100644
index 00000000..e6d926da
--- /dev/null
+++ b/serviceerror/unimplemented.go
@@ -0,0 +1,63 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2020 Temporal Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package serviceerror
+
+import (
+	"github.com/gogo/status"
+	"google.golang.org/grpc/codes"
+)
+
+type (
+	// Unimplemented represents unimplemented error.
+	Unimplemented struct {
+		Message string
+		st *status.Status
+	}
+)
+
+// NewUnimplemented returns new Unimplemented error.
+func NewUnimplemented(message string) *Unimplemented {
+	return &Unimplemented{
+		Message: message,
+	}
+}
+
+// Error returns string message.
+func (e *Unimplemented) Error() string {
+	return e.Message
+}
+
+func (e *Unimplemented) status() *status.Status {
+	if e.st != nil{
+		return e.st
+	}
+
+	return status.New(codes.Unimplemented, e.Message)
+}
+
+func newUnimplemented(st *status.Status) *Unimplemented {
+	return &Unimplemented{
+		Message: st.Message(),
+		st: st,
+	}
+}