vitess.io/vitess@v0.16.2/go/vt/schemadiff/names.go (about)

     1  /*
     2  Copyright 2022 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package schemadiff
    18  
    19  import (
    20  	"regexp"
    21  )
    22  
    23  // constraint name examples:
    24  // - check1
    25  // - check1_db9d15e218979970c23bfc13a
    26  // - isnegative_2dbf8418af7250d783beb2083
    27  // - employee_id_af3d858eb99b87d6419133d5c
    28  // where:
    29  // - db9d15e218979970c23bfc13a is a deterministic vitess-generates sum (128 bit encoded with base36, 25 characters)
    30  // - check1, isnegative, employee_id -- are the original constraints names
    31  var constraintVitessNameRegexp = regexp.MustCompile(`^(.*?)(_([0-9a-z]{25}))?$`)
    32  
    33  func ExtractConstraintOriginalName(constraintName string) string {
    34  	if submatch := constraintVitessNameRegexp.FindStringSubmatch(constraintName); len(submatch) > 0 {
    35  		return submatch[1]
    36  	}
    37  	return constraintName
    38  }