tidb matchers 源码
tidb matchers 代码
文件路径：/util/table-filter/matchers.go
// Copyright 2021 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package filter
import (
"regexp"
"strings"
"github.com/pingcap/errors"
)
// tableRule of a tableFilter, consisting of a schema and table pattern, and may be an
// accept-list (positive) or deny-list (negative).
type tableRule struct {
schema matcher
table matcher
positive bool
}
// columnRule of a columnFilter, consisting of a column pattern, and may be an
// accept-list (positive) or deny-list (negative).
type columnRule struct {
column matcher
positive bool
}
// matcher matches a name against a pattern.
type matcher interface {
matchString(name string) bool
matchAllStrings() bool
toLower() matcher
}
// stringMatcher is a matcher with a literal string.
type stringMatcher string
func (m stringMatcher) matchString(name string) bool {
return string(m) == name
}
func (stringMatcher) matchAllStrings() bool {
return false
}
func (m stringMatcher) toLower() matcher {
return stringMatcher(strings.ToLower(string(m)))
}
// trueMatcher is a matcher which matches everything. The `*` pattern.
type trueMatcher struct{}
func (trueMatcher) matchString(string) bool {
return true
}
func (trueMatcher) matchAllStrings() bool {
return true
}
func (m trueMatcher) toLower() matcher {
return m
}
// regexpMatcher is a matcher based on a regular expression.
type regexpMatcher struct {
pattern *regexp.Regexp
}
func newRegexpMatcher(pat string) (matcher, error) {
if pat == "(?s)^.*$" {
// special case for '*'
return trueMatcher{}, nil
}
pattern, err := regexp.Compile(pat)
if err != nil {
return nil, errors.Trace(err)
}
return regexpMatcher{pattern: pattern}, nil
}
func (m regexpMatcher) matchString(name string) bool {
return m.pattern.MatchString(name)
}
func (regexpMatcher) matchAllStrings() bool {
return false
}
func (m regexpMatcher) toLower() matcher {
pattern := regexp.MustCompile("(?i)" + m.pattern.String())
return regexpMatcher{pattern: pattern}
}
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