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matcher.go
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matcher.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package models
import (
"bytes"
"errors"
"fmt"
"regexp"
"strings"
)
func (m MatchType) String() string {
switch m {
case MatchEqual:
return "="
case MatchNotEqual:
return "!="
case MatchRegexp:
return "=~"
case MatchNotRegexp:
return "!~"
case MatchField:
return "-"
case MatchNotField:
return "!-"
case MatchAll:
return "*"
default:
return "unknown match type"
}
}
// NewMatcher returns a matcher object.
func NewMatcher(t MatchType, n, v []byte) (Matcher, error) {
m := Matcher{
Type: t,
Name: n,
Value: v,
}
if len(n) == 0 && t != MatchAll {
return Matcher{}, errors.New("name must be set unless using MatchAll")
}
if t == MatchRegexp || t == MatchNotRegexp {
re, err := regexp.Compile("^(?:" + string(v) + ")$")
if err != nil {
return Matcher{}, err
}
m.re = re
}
return m, nil
}
func (m Matcher) String() string {
return fmt.Sprintf("%s%s%q", m.Name, m.Type, m.Value)
}
// ToTags converts Matchers to Tags
// NB (braskin): this only works for exact matches
func (m Matchers) ToTags(
tagOptions TagOptions,
) (Tags, error) {
// todo: nil is good here?
tags := NewTags(len(m), tagOptions)
for _, v := range m {
if v.Type != MatchEqual {
return EmptyTags(),
fmt.Errorf("illegal match type, got %v, but expecting: %v",
v.Type, MatchEqual)
}
tags = tags.AddTag(Tag{Name: v.Name, Value: v.Value}).Clone()
}
return tags, nil
}
func (m Matchers) String() string {
var buffer bytes.Buffer
for _, match := range m {
buffer.WriteString(match.String())
buffer.WriteByte(sep)
}
return buffer.String()
}
// TODO: make this more robust, handle types other than MatchEqual
func matcherFromString(s string) (Matcher, error) {
ss := strings.Split(s, ":")
length := len(ss)
if length > 2 {
return Matcher{}, errors.New("invalid arg length for matcher")
}
if length == 0 || len(ss[0]) == 0 {
return Matcher{}, errors.New("empty matcher")
}
if length == 1 {
return Matcher{
Type: MatchRegexp,
Name: []byte(ss[0]),
Value: []byte{},
}, nil
}
return Matcher{
Type: MatchRegexp,
Name: []byte(ss[0]),
Value: []byte(ss[1]),
}, nil
}
// MatchersFromString parses a string into Matchers
// TODO: make this more robust, handle types other than MatchEqual
func MatchersFromString(s string) (Matchers, error) {
split := strings.Fields(s)
matchers := make(Matchers, len(split))
for i, ss := range split {
matcher, err := matcherFromString(ss)
if err != nil {
return nil, err
}
matchers[i] = matcher
}
return matchers, nil
}