From 30964f0ae14ca4c27b852007a9dbaba3c66ea393 Mon Sep 17 00:00:00 2001
From: WangXiangUSTC <347249478@qq.com>
Date: Tue, 23 Oct 2018 17:57:47 +0800
Subject: [PATCH 1/2] add some function to adjust juju/error

---
 juju_adaptor.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/juju_adaptor.go b/juju_adaptor.go
index 0b20f57..ccfb2fc 100644
--- a/juju_adaptor.go
+++ b/juju_adaptor.go
@@ -2,6 +2,7 @@ package errors
 
 import (
 	"fmt"
+	"strings"
 )
 
 // ==================== juju adaptor start ========================
@@ -61,6 +62,11 @@ func ErrorStack(err error) string {
 	return fmt.Sprintf("%+v", err)
 }
 
+// IsNotFound reports whether err was not found error.
+func IsNotFound(err error) bool {
+	return strings.Contains(err.Error(), "not found")
+}
+
 // NotFoundf represents an error with not found message.
 func NotFoundf(format string, args ...interface{}) error {
 	return Errorf(format+" not found", args...)
@@ -76,4 +82,18 @@ func NotSupportedf(format string, args ...interface{}) error {
 	return Errorf(format+" not supported", args...)
 }
 
+// NotValidf represents an error with not valid message.
+func NotValidf(format string, args ...interface{}) error {
+	return Errorf(format+" not valid", args...)
+}
+
+func IsAlreadyExists(err error) bool {
+	return strings.Contains(err.Error(), "already exists")
+}
+
+// AlreadyExistsf represents an error with already exists message.
+func AlreadyExistsf(format string, args ...interface{}) error {
+	return Errorf(format+" already exists", args...)
+}
+
 // ==================== juju adaptor end ========================

From c22a95629595d66d2902c19514ad2e68147bcb9b Mon Sep 17 00:00:00 2001
From: WangXiangUSTC <347249478@qq.com>
Date: Tue, 23 Oct 2018 18:00:01 +0800
Subject: [PATCH 2/2] add comment

---
 juju_adaptor.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/juju_adaptor.go b/juju_adaptor.go
index ccfb2fc..8bcfe2f 100644
--- a/juju_adaptor.go
+++ b/juju_adaptor.go
@@ -87,6 +87,7 @@ func NotValidf(format string, args ...interface{}) error {
 	return Errorf(format+" not valid", args...)
 }
 
+// IsAlreadyExists reports whether err was already exists error.
 func IsAlreadyExists(err error) bool {
 	return strings.Contains(err.Error(), "already exists")
 }