-
Notifications
You must be signed in to change notification settings - Fork 0
/
cacher.go
120 lines (100 loc) · 2.75 KB
/
cacher.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
// Copyright 2023 Stichting ThingsIX Foundation
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package cacher
import (
"context"
"encoding/json"
"fmt"
"strings"
"time"
"github.com/ThingsIXFoundation/data-aggregator/config"
"github.com/ThingsIXFoundation/data-aggregator/mapper/store"
"github.com/go-redis/redis/v8"
"github.com/sirupsen/logrus"
"github.com/spf13/viper"
)
type MapperCacher struct {
redis redis.UniversalClient
store store.Store
}
func NewMapperCacher() (*MapperCacher, error) {
store, err := store.NewStore()
if err != nil {
return nil, err
}
redis := redis.NewUniversalClient(&redis.UniversalOptions{Addrs: []string{viper.GetString(config.CONFIG_MAPPER_CACHER_REDIS_HOST)}})
gc := &MapperCacher{
store: store,
redis: redis,
}
return gc, nil
}
func (gc *MapperCacher) Run(ctx context.Context) error {
pollInterval := viper.GetDuration(config.CONFIG_MAPPER_CACHER_UPDATE_INTERVAL)
logrus.Info("caching mapper state")
err := gc.cache(ctx)
if err != nil {
logrus.WithError(err).Warn("unable to cache mapper state")
}
// periodically update the mapper cache
for {
select {
case <-time.After(pollInterval):
err := gc.cache(ctx)
if err != nil {
logrus.WithError(err).Warn("unable to cache mapper state")
}
case <-ctx.Done():
return ctx.Err()
}
}
}
func (gc *MapperCacher) cache(ctx context.Context) error {
logrus.Info("caching mapper state")
mappers, err := gc.store.GetAll(ctx)
if err != nil {
return err
}
ids := make(map[string]bool)
pipe := gc.redis.Pipeline()
for _, mapper := range mappers {
b, err := json.Marshal(&mapper)
if err != nil {
return nil
}
pipe.Set(ctx, fmt.Sprintf("Mapper.%s", mapper.ID.String()), string(b), 0)
ids[mapper.ID.String()] = true
}
_, err = pipe.Exec(ctx)
if err != nil {
return err
}
it := gc.redis.Scan(ctx, 0, "Mapper.*", 0).Iterator()
for it.Next(ctx) {
key := it.Val()
parts := strings.Split(key, ".")
if len(parts) < 2 {
logrus.Warnf("got invalid key while deleting mappers from cache: %s", key)
continue
}
id := parts[1]
if _, ok := ids[id]; !ok {
logrus.Infof("deleting mapper from cache as it's not in the store anymore: %s", id)
gc.redis.Del(ctx, key)
}
}
return nil
}