Fix errors message

Signed-off-by: dusanb94 <dusan.borovcanin@mainflux.com>

things/redis/channels.go

@@ -14,14 +14,16 @@ import (
 
 const chanPrefix = "channel"
 
-// ErrRedisConnectChannel indicates error while adding connection in redis cache
-var ErrRedisConnectChannel = errors.New("add connection to redis cache error")
+var (
+	// ErrRedisConnectChannel indicates error while adding connection in redis cache
+	ErrRedisConnectChannel = errors.New("failed to add connection to redis cache")
 
-// ErrRedisDisconnectChannel indicates error while removing connection from redis cache
-var ErrRedisDisconnectChannel = errors.New("remove connection from redis cache error")
+	// ErrRedisDisconnectChannel indicates error while removing connection from redis cache
+	ErrRedisDisconnectChannel = errors.New("failed to remove connection from redis cache")
 
-// ErrRedisRemoveChannel indicates error while removing channel from redis cache
-var ErrRedisRemoveChannel = errors.New("remove channel from redis cache error")
+	// ErrRedisRemoveChannel indicates error while removing channel from redis cache
+	ErrRedisRemoveChannel = errors.New("failed to remove channel from redis cache")
+)
 
 var _ things.ChannelCache = (*channelCache)(nil)
 

things/redis/things.go

@@ -19,13 +19,13 @@ const (
 
 var (
 	// ErrRedisThingSave indicates error while saving Thing in redis cache
-	ErrRedisThingSave = errors.New("saving thing in redis cache error")
+	ErrRedisThingSave = errors.New("failed to save thing in redis cache")
 
 	// ErrRedisThingID indicates error while geting Thing ID from redis cache
-	ErrRedisThingID = errors.New("get thing id from redis cache error")
+	ErrRedisThingID = errors.New("failed to get thing id from redis cache")
 
 	// ErrRedisThingRemove indicates error while removing Thing from redis cache
-	ErrRedisThingRemove = errors.New("remove thing from redis cache error")
+	ErrRedisThingRemove = errors.New("failed to remove thing from redis cache")
 )
 
 var _ things.ThingCache = (*thingCache)(nil)