-
Notifications
You must be signed in to change notification settings - Fork 1.1k
/
stream_filter.go
293 lines (263 loc) · 6.3 KB
/
stream_filter.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
package logstorage
import (
"fmt"
"strconv"
"strings"
"sync"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/regexutil"
)
// StreamFilter is a filter for streams, e.g. `_stream:{...}`
type StreamFilter struct {
orFilters []*andStreamFilter
}
func (sf *StreamFilter) matchStreamName(s string) bool {
sn := getStreamName()
defer putStreamName(sn)
if !sn.parse(s) {
return false
}
for _, of := range sf.orFilters {
matchAndFilters := true
for _, tf := range of.tagFilters {
if !sn.match(tf) {
matchAndFilters = false
break
}
}
if matchAndFilters {
return true
}
}
return false
}
func (sf *StreamFilter) isEmpty() bool {
for _, af := range sf.orFilters {
if len(af.tagFilters) > 0 {
return false
}
}
return true
}
func (sf *StreamFilter) marshalForCacheKey(dst []byte) []byte {
dst = encoding.MarshalVarUint64(dst, uint64(len(sf.orFilters)))
for _, af := range sf.orFilters {
dst = encoding.MarshalVarUint64(dst, uint64(len(af.tagFilters)))
for _, f := range af.tagFilters {
dst = encoding.MarshalBytes(dst, bytesutil.ToUnsafeBytes(f.tagName))
dst = encoding.MarshalBytes(dst, bytesutil.ToUnsafeBytes(f.op))
dst = encoding.MarshalBytes(dst, bytesutil.ToUnsafeBytes(f.value))
}
}
return dst
}
func (sf *StreamFilter) String() string {
a := make([]string, len(sf.orFilters))
for i := range a {
a[i] = sf.orFilters[i].String()
}
return "{" + strings.Join(a, " or ") + "}"
}
type andStreamFilter struct {
tagFilters []*streamTagFilter
}
func (af *andStreamFilter) String() string {
a := make([]string, len(af.tagFilters))
for i := range a {
a[i] = af.tagFilters[i].String()
}
return strings.Join(a, ",")
}
// streamTagFilter is a filter for `tagName op value`
type streamTagFilter struct {
// tagName is the name for the tag to filter
tagName string
// op is operation such as `=`, `!=`, `=~` or `!~`
op string
// value is the value
value string
regexp *regexutil.PromRegex
}
func (tf *streamTagFilter) String() string {
return quoteTokenIfNeeded(tf.tagName) + tf.op + strconv.Quote(tf.value)
}
func parseStreamFilter(lex *lexer) (*StreamFilter, error) {
if !lex.isKeyword("{") {
return nil, fmt.Errorf("unexpected token %q instead of '{' in _stream filter", lex.token)
}
if !lex.mustNextToken() {
return nil, fmt.Errorf("incomplete _stream filter after '{'")
}
var filters []*andStreamFilter
for {
f, err := parseAndStreamFilter(lex)
if err != nil {
return nil, err
}
filters = append(filters, f)
switch {
case lex.isKeyword("}"):
lex.nextToken()
sf := &StreamFilter{
orFilters: filters,
}
return sf, nil
case lex.isKeyword("or"):
if !lex.mustNextToken() {
return nil, fmt.Errorf("incomplete _stream filter after 'or'")
}
if lex.isKeyword("}") {
return nil, fmt.Errorf("unexpected '}' after 'or' in _stream filter")
}
default:
return nil, fmt.Errorf("unexpected token in _stream filter: %q; want '}' or 'or'", lex.token)
}
}
}
func parseAndStreamFilter(lex *lexer) (*andStreamFilter, error) {
var filters []*streamTagFilter
for {
if lex.isKeyword("}") {
asf := &andStreamFilter{
tagFilters: filters,
}
return asf, nil
}
f, err := parseStreamTagFilter(lex)
if err != nil {
return nil, err
}
filters = append(filters, f)
switch {
case lex.isKeyword("or", "}"):
asf := &andStreamFilter{
tagFilters: filters,
}
return asf, nil
case lex.isKeyword(","):
if !lex.mustNextToken() {
return nil, fmt.Errorf("missing stream filter after ','")
}
default:
return nil, fmt.Errorf("unexpected token %q in _stream filter; want 'or', 'and', '}' or ','", lex.token)
}
}
}
func parseStreamTagFilter(lex *lexer) (*streamTagFilter, error) {
tagName := lex.token
if !lex.mustNextToken() {
return nil, fmt.Errorf("missing operation in _stream filter for %q field", tagName)
}
if !lex.isKeyword("=", "!=", "=~", "!~") {
return nil, fmt.Errorf("unsupported operation %q in _steam filter for %q field; supported operations: =, !=, =~, !~", lex.token, tagName)
}
op := lex.token
if !lex.mustNextToken() {
return nil, fmt.Errorf("missing _stream filter value for %q field", tagName)
}
value := lex.token
if !lex.mustNextToken() {
return nil, fmt.Errorf("missing token after %q%s%q filter", tagName, op, value)
}
stf := &streamTagFilter{
tagName: tagName,
op: op,
value: value,
}
if op == "=~" || op == "!~" {
re, err := regexutil.NewPromRegex(value)
if err != nil {
return nil, fmt.Errorf("invalid regexp %q for stream filter: %w", value, err)
}
stf.regexp = re
}
return stf, nil
}
func getStreamName() *streamName {
v := streamNamePool.Get()
if v == nil {
return &streamName{}
}
return v.(*streamName)
}
func putStreamName(sn *streamName) {
sn.reset()
streamNamePool.Put(sn)
}
var streamNamePool sync.Pool
type streamName struct {
tags []Field
}
func (sn *streamName) reset() {
clear(sn.tags)
sn.tags = sn.tags[:0]
}
func (sn *streamName) parse(s string) bool {
if len(s) < 2 || s[0] != '{' || s[len(s)-1] != '}' {
return false
}
s = s[1 : len(s)-1]
if len(s) == 0 {
return true
}
for {
// Parse tag name
n := strings.IndexByte(s, '=')
if n < 0 {
// cannot find tag name
return false
}
name := s[:n]
s = s[n+1:]
// Parse tag value
if len(s) == 0 || s[0] != '"' {
return false
}
qPrefix, err := strconv.QuotedPrefix(s)
if err != nil {
return false
}
s = s[len(qPrefix):]
value, err := strconv.Unquote(qPrefix)
if err != nil {
return false
}
sn.tags = append(sn.tags, Field{
Name: name,
Value: value,
})
if len(s) == 0 {
return true
}
if s[0] != ',' {
return false
}
s = s[1:]
}
}
func (sn *streamName) match(tf *streamTagFilter) bool {
v := sn.getTagValueByTagName(tf.tagName)
switch tf.op {
case "=":
return v == tf.value
case "!=":
return v != tf.value
case "=~":
return tf.regexp.MatchString(v)
case "!~":
return !tf.regexp.MatchString(v)
default:
logger.Panicf("BUG: unexpected tagFilter operation: %q", tf.op)
return false
}
}
func (sn *streamName) getTagValueByTagName(name string) string {
for _, t := range sn.tags {
if t.Name == name {
return t.Value
}
}
return ""
}