-
Notifications
You must be signed in to change notification settings - Fork 10
/
config.go
145 lines (120 loc) · 3.12 KB
/
config.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
// Copyright The HTNN Authors.
//
// 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 limit_count_redis
import (
"crypto/tls"
"fmt"
"net"
"strings"
"github.com/google/cel-go/cel"
"github.com/google/uuid"
"github.com/redis/go-redis/v9"
"mosn.io/htnn/pkg/expr"
"mosn.io/htnn/pkg/filtermanager/api"
"mosn.io/htnn/pkg/plugins"
)
const (
Name = "limitCountRedis"
)
func init() {
plugins.RegisterHttpPlugin(Name, &plugin{})
}
type plugin struct {
plugins.PluginMethodDefaultImpl
}
func (p *plugin) Type() plugins.PluginType {
return plugins.TypeTraffic
}
func (p *plugin) Order() plugins.PluginOrder {
return plugins.PluginOrder{
Position: plugins.OrderPositionTraffic,
}
}
func (p *plugin) Factory() api.FilterFactory {
return factory
}
func (p *plugin) Config() api.PluginConfig {
return &config{}
}
type config struct {
Config
client *redis.Client
limiters []*Limiter
quotaPolicy string
}
type Limiter struct {
script expr.Script
count uint32
timeWindow int64
prefix string
}
func (conf *config) Validate() error {
err := conf.Config.Validate()
if err != nil {
return err
}
addr := conf.GetAddress()
if addr != "" {
_, _, err = net.SplitHostPort(addr)
if err != nil {
return fmt.Errorf("bad address %s: %w", addr, err)
}
}
for i, rule := range conf.Rules {
if rule.Key == "" {
continue
}
_, err = expr.CompileCel(rule.Key, cel.StringType)
if err != nil {
return fmt.Errorf("bad rule %d: %w", i, err)
}
}
if conf.Username != "" && conf.Password == "" {
return fmt.Errorf("password is required when username is set")
}
return nil
}
func (conf *config) Init(cb api.ConfigCallbackHandler) error {
addr := conf.GetAddress()
opt := &redis.Options{
Addr: addr,
Username: conf.Username,
Password: conf.Password,
}
if conf.Tls {
opt.TLSConfig = &tls.Config{
InsecureSkipVerify: conf.TlsSkipVerify,
}
}
conf.client = redis.NewClient(opt)
prefix := uuid.NewString()[:8] // enough for millions configurations
api.LogInfof("limitCountRedis filter uses %s as prefix, config: %v", prefix, &conf.Config)
conf.limiters = make([]*Limiter, len(conf.Rules))
quotaPolicy := make([]string, len(conf.Rules))
for i, rule := range conf.Rules {
conf.limiters[i] = &Limiter{
count: rule.Count,
timeWindow: rule.TimeWindow.Seconds,
prefix: fmt.Sprintf("%s|%d", prefix, i),
}
quotaPolicy[i] = fmt.Sprintf("%d;w=%d", rule.Count, rule.TimeWindow.Seconds)
if rule.Key == "" {
continue
}
script, _ := expr.CompileCel(rule.Key, cel.StringType)
conf.limiters[i].script = script
}
conf.quotaPolicy = strings.Join(quotaPolicy, ", ")
return nil
}