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ext_filter.go
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ext_filter.go
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package nsqd
import (
"errors"
"regexp"
"github.com/gobwas/glob"
"github.com/tidwall/gjson"
"github.com/youzan/nsq/internal/ext"
)
// {
// "ver":1,
// "filter_ext_key":"xx",
// "filter_data":"filterA",
// }
// {
// "ver":2,
// "filter_ext_key":"xx",
// "filter_data":"regexp string",
// }
// {
// "ver":3,
// "filter_ext_key":"xx",
// "filter_data":"glob rule",
// }
// ver is used to extend other filter type
// currently support equal, regexp, glob
// TODO: maybe support multi ext key rule chains
// such as, filter if match_rule1(ext_key1) and match_rule2(ext_key2) or match_rule3(ext_key3)
var (
ErrNotSupportedFilter = errors.New("the filter type not supported")
ErrInvalidFilter = errors.New("invalid filter rule")
)
type ExtFilterData struct {
Type int `json:"type,omitempty"`
Inverse bool `json:"inverse,omitempty"`
FilterExtKey string `json:"filter_ext_key,omitempty"`
FilterData string `json:"filter_data,omitempty"`
FilterDataList []MultiFilterData `json:"filter_data_list,omitempty"`
}
type MultiFilterData struct {
FilterExtKey string `json:"filter_ext_key,omitempty"`
FilterData string `json:"filter_data,omitempty"`
}
type IExtFilter interface {
Match(msg *Message) bool
}
func getMsgExtFilterStr(msg *Message, key string) string {
filterData := gjson.GetBytes(msg.ExtBytes, key)
var msgExtFilterHeader string
if filterData.Type == gjson.String {
msgExtFilterHeader = filterData.String()
}
return msgExtFilterHeader
}
func isMatchedJsonValue(filterData gjson.Result, match interface{}) bool {
switch t := match.(type) {
case string:
if filterData.Type == gjson.String && t == filterData.String() {
return true
}
if t == "" {
// empty rule
return true
}
case []byte:
if filterData.Type == gjson.String && string(t) == filterData.String() {
return true
}
if len(t) == 0 {
// empty rule
return true
}
}
return false
}
type extReFilter struct {
re *regexp.Regexp
extKey string
}
func (crf *extReFilter) Match(msg *Message) bool {
if msg.ExtVer != ext.JSON_HEADER_EXT_VER {
return false
}
d := getMsgExtFilterStr(msg, crf.extKey)
return crf.re.MatchString(d)
}
type extExactlyFilter struct {
match string
extKey string
}
func (cef *extExactlyFilter) Match(msg *Message) bool {
if msg.ExtVer != ext.JSON_HEADER_EXT_VER {
return false
}
filterData := gjson.GetBytes(msg.ExtBytes, cef.extKey)
return isMatchedJsonValue(filterData, cef.match)
}
type extGlobFilter struct {
globF glob.Glob
extKey string
}
func (cgf *extGlobFilter) Match(msg *Message) bool {
if msg.ExtVer != ext.JSON_HEADER_EXT_VER {
return false
}
d := getMsgExtFilterStr(msg, cgf.extKey)
return cgf.globF.Match(d)
}
type extMultiFilter struct {
chainFilters []IExtFilter
relation string
}
func (f *extMultiFilter) Match(msg *Message) bool {
for _, r := range f.chainFilters {
if r.Match(msg) {
if f.relation == "any" {
return true
}
} else {
if f.relation == "all" {
return false
}
}
}
if f.relation == "all" {
return true
}
return false
}
func NewExtFilter(filter ExtFilterData) (IExtFilter, error) {
var cf IExtFilter
var err error
if filter.FilterExtKey == "" {
return nil, ErrInvalidFilter
}
if filter.FilterData == "" {
if filter.Type != 4 {
return nil, ErrInvalidFilter
}
}
if filter.Type == 1 {
cef := &extExactlyFilter{}
cef.match = filter.FilterData
cef.extKey = filter.FilterExtKey
cf = cef
} else if filter.Type == 2 {
crf := &extReFilter{}
crf.re, err = regexp.Compile(filter.FilterData)
if err != nil {
return nil, err
}
crf.extKey = filter.FilterExtKey
cf = crf
} else if filter.Type == 3 {
cgf := &extGlobFilter{}
cgf.globF, err = glob.Compile(filter.FilterData)
if err != nil {
return nil, err
}
cgf.extKey = filter.FilterExtKey
cf = cgf
} else if filter.Type == 4 {
mf := &extMultiFilter{}
filters := filter.FilterDataList
if len(filters) == 0 {
return nil, ErrInvalidFilter
}
mf.relation = filter.FilterExtKey
for _, f := range filters {
ef := &extExactlyFilter{}
if f.FilterExtKey == "" || f.FilterData == "" {
return nil, ErrInvalidFilter
}
ef.match = f.FilterData
ef.extKey = f.FilterExtKey
mf.chainFilters = append(mf.chainFilters, ef)
}
cf = mf
} else {
return nil, ErrNotSupportedFilter
}
return cf, nil
}