Upgrade to new go errors and some minor fixes and improvements including easier debugging of invalid routes and e.t.c.

Former-commit-id: 5809157b952ccc61a67a9861470774b3a6fee024

sessions/sessiondb/redis/database.go

@@ -1,9 +1,9 @@
 package redis
 
 import (
+	"errors"
 	"time"
 
-	"github.com/kataras/iris/core/errors"
 	"github.com/kataras/iris/sessions"
 
 	"github.com/kataras/golog"
@@ -252,8 +252,13 @@ func closeDB(db *Database) error {
 }
 
 var (
-	// ErrRedisClosed an error with message 'Redis is already closed'
-	ErrRedisClosed = errors.New("Redis is already closed")
-	// ErrKeyNotFound an error with message 'Key $thekey doesn't found'
-	ErrKeyNotFound = errors.New("Key '%s' doesn't found")
+	// ErrRedisClosed an error with message 'redis: already closed'
+	ErrRedisClosed = errors.New("redis: already closed")
+	// ErrKeyNotFound a type of error of non-existing redis keys.
+	// The producers(the library) of this error will dynamically wrap this error(fmt.Errorf) with the key name.
+	// Usage:
+	// if err != nil && errors.Is(err, ErrKeyNotFound) {
+	// [...]
+	// }
+	ErrKeyNotFound = errors.New("key not found")
 )

sessions/sessiondb/redis/driver_radix.go

@@ -145,7 +145,7 @@ func (r *RadixDriver) Get(key string) (interface{}, error) {
 		return nil, err
 	}
 	if mn.Nil {
-		return nil, ErrKeyNotFound.Format(key)
+		return nil, fmt.Errorf("%s: %w", key, ErrKeyNotFound)
 	}
 	return redisVal, nil
 }

sessions/sessiondb/redis/driver_redigo.go

@@ -83,7 +83,7 @@ func (r *RedigoDriver) Get(key string) (interface{}, error) {
 		return nil, err
 	}
 	if redisVal == nil {
-		return nil, ErrKeyNotFound.Format(key)
+		return nil, fmt.Errorf("%s: %w", key, ErrKeyNotFound)
 	}
 	return redisVal, nil
 }
@@ -256,7 +256,7 @@ func (r *RedigoDriver) GetBytes(key string) ([]byte, error) {
 		return nil, err
 	}
 	if redisVal == nil {
-		return nil, ErrKeyNotFound.Format(key)
+		return nil, fmt.Errorf("%s: %w", key, ErrKeyNotFound)
 	}
 
 	return redis.Bytes(redisVal, err)