vitess.io/vitess@v0.16.2/go/test/fuzzing/ast_fuzzer.go (about)

     1  //go:build gofuzz
     2  // +build gofuzz
     3  
     4  /*
     5  Copyright 2021 The Vitess Authors.
     6  Licensed under the Apache License, Version 2.0 (the "License");
     7  you may not use this file except in compliance with the License.
     8  You may obtain a copy of the License at
     9      http://www.apache.org/licenses/LICENSE-2.0
    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 fuzzing
    18  
    19  import (
    20  	fuzz "github.com/AdaLogics/go-fuzz-headers"
    21  
    22  	"vitess.io/vitess/go/vt/sqlparser"
    23  )
    24  
    25  // FuzzEqualsSQLNode implements the fuzzer
    26  func FuzzEqualsSQLNode(data []byte) int {
    27  	if len(data) < 10 {
    28  		return 0
    29  	}
    30  	f := fuzz.NewConsumer(data)
    31  	query1, err := f.GetSQLString()
    32  	if err != nil {
    33  		return 0
    34  	}
    35  	query2, err := f.GetSQLString()
    36  	if err != nil {
    37  		return 0
    38  	}
    39  	inA, err := sqlparser.Parse(query1)
    40  	if err != nil {
    41  		return 0
    42  	}
    43  	inB, err := sqlparser.Parse(query2)
    44  	if err != nil {
    45  		return 0
    46  	}
    47  
    48  	// There are 3 targets in this fuzzer:
    49  	// 1) sqlparser.EqualsSQLNode
    50  	// 2) sqlparser.CloneSQLNode
    51  	// 3) sqlparser.VisitSQLNode
    52  
    53  	// Target 1:
    54  	identical := sqlparser.EqualsSQLNode(inA, inA)
    55  	if !identical {
    56  		panic("Should be identical")
    57  	}
    58  	identical = sqlparser.EqualsSQLNode(inB, inB)
    59  	if !identical {
    60  		panic("Should be identical")
    61  	}
    62  
    63  	// Target 2:
    64  	newSQLNode := sqlparser.CloneSQLNode(inA)
    65  	if !sqlparser.EqualsSQLNode(inA, newSQLNode) {
    66  		panic("These two nodes should be identical")
    67  	}
    68  
    69  	// Target 3:
    70  	_ = sqlparser.VisitSQLNode(inA, func(node sqlparser.SQLNode) (bool, error) { return false, nil })
    71  	return 1
    72  }