-
Notifications
You must be signed in to change notification settings - Fork 0
/
kafka.go
201 lines (177 loc) · 4.18 KB
/
kafka.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
package kafkaclient
import (
"encoding/json"
"errors"
"sync"
"github.com/antonio-alexander/go-bludgeon/changes/client"
"github.com/antonio-alexander/go-bludgeon/changes/data"
"github.com/antonio-alexander/go-bludgeon/internal"
"github.com/antonio-alexander/go-bludgeon/internal/config"
internal_kafka "github.com/antonio-alexander/go-bludgeon/internal/kafka"
internal_logger "github.com/antonio-alexander/go-bludgeon/internal/logger"
logger "github.com/antonio-alexander/go-bludgeon/internal/logger"
"github.com/google/uuid"
)
type kafkaClient struct {
sync.RWMutex
sync.WaitGroup
internal_logger.Logger
handlers map[string]client.HandlerFx
subscribeId string
initialized bool
configured bool
config *Configuration
kafkaClient interface {
internal.Configurer
internal.Initializer
internal.Parameterizer
internal_kafka.Client
}
}
func New() interface {
client.Handler
internal.Initializer
internal.Parameterizer
internal.Configurer
} {
return &kafkaClient{
handlers: make(map[string]client.HandlerFx),
kafkaClient: internal_kafka.New(),
Logger: logger.NewNullLogger(),
}
}
func (k *kafkaClient) handleFx(changes ...*data.Change) {
k.RLock()
defer k.RUnlock()
var wg sync.WaitGroup
for _, handleFx := range k.handlers {
wg.Add(1)
go func(handleFx client.HandlerFx) {
defer wg.Done()
handleFx(changes...)
}(handleFx)
}
wg.Wait()
}
func (k *kafkaClient) subscribeFx(topic string, bytes []byte) {
if len(bytes) == 0 {
k.Trace(logAlias + "no bytes received")
return
}
wrapper := &data.Wrapper{}
if err := json.Unmarshal(bytes, wrapper); err != nil {
k.Error(logAlias+"error while unmarshalling json: %s", err)
return
}
item, err := data.FromWrapper(wrapper)
if err != nil {
k.Error(logAlias+"error during FromWrapper: %s", err)
return
}
switch v := item.(type) {
default:
k.Trace(logAlias+"received unsupported type: %T", v)
case *data.Change:
k.handleFx(v)
case *data.ChangeDigest:
k.handleFx(v.Changes...)
}
}
func (k *kafkaClient) SetParameters(parameters ...interface{}) {
k.kafkaClient.SetParameters(parameters...)
for _, parameter := range parameters {
switch p := parameter.(type) {
case interface {
internal.Configurer
internal.Initializer
internal.Parameterizer
internal_kafka.Client
}:
k.kafkaClient = p
}
}
switch {
case k.kafkaClient == nil:
panic("kafka client not set")
}
}
func (k *kafkaClient) SetUtilities(parameters ...interface{}) {
k.kafkaClient.SetUtilities(parameters...)
for _, parameter := range parameters {
switch p := parameter.(type) {
case internal_logger.Logger:
k.Logger = p
}
}
}
func (k *kafkaClient) Configure(items ...interface{}) error {
k.Lock()
defer k.Unlock()
var envs map[string]string
var c *Configuration
if err := k.kafkaClient.Configure(items...); err != nil {
return err
}
for _, item := range items {
switch v := item.(type) {
case config.Envs:
envs = v
case *Configuration:
c = v
}
}
if c == nil {
c = new(Configuration)
c.Default()
c.FromEnv(envs)
}
if err := c.Validate(); err != nil {
return err
}
k.config = c
k.configured = true
return nil
}
func (k *kafkaClient) Initialize() error {
k.Lock()
defer k.Unlock()
if err := k.kafkaClient.Initialize(); err != nil {
return err
}
subscribeId, err := k.kafkaClient.Subscribe(k.config.Topic, k.subscribeFx)
if err != nil {
return err
}
k.initialized, k.subscribeId = true, subscribeId
return nil
}
func (k *kafkaClient) Shutdown() {
k.Lock()
defer k.Unlock()
if !k.initialized {
return
}
k.kafkaClient.Unsubscribe(k.subscribeId)
k.initialized, k.subscribeId = false, ""
k.Info(logAlias + "shutdown")
}
func (k *kafkaClient) HandlerCreate(handlerFx client.HandlerFx) (string, error) {
k.Lock()
defer k.Unlock()
handlerId := uuid.Must(uuid.NewRandom()).String()
k.handlers[handlerId] = handlerFx
return handlerId, nil
}
func (k *kafkaClient) HandlerConnected(handlerId string) (bool, error) {
return k.subscribeId != "", nil
}
func (k *kafkaClient) HandlerDelete(handlerId string) error {
k.Lock()
defer k.Unlock()
_, ok := k.handlers[handlerId]
if !ok {
return errors.New("handler not found")
}
delete(k.handlers, handlerId)
return nil
}