-
Notifications
You must be signed in to change notification settings - Fork 24
/
provider.go
241 lines (197 loc) · 6.59 KB
/
provider.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
package couchbase
import (
"encoding/json"
"errors"
"fmt"
"log"
"reflect"
"sort"
"strings"
"time"
"github.com/andrewwebber/cqrs"
couchbase "github.com/couchbaselabs/go-couchbase"
)
type cbVersionedEvent struct {
ID string `json:"id"`
CorrelationID string `json:"correlationID"`
SourceID string `json:"sourceID"`
Version int `json:"version"`
EventType string `json:"eventType"`
Created time.Time `json:"time"`
Event json.RawMessage
}
// EventStreamRepository : a Couchbase Server event stream repository
type EventStreamRepository struct {
bucket *couchbase.Bucket
cbPrefix string
}
// NewEventStreamRepository creates new Couchbase Server based event stream repository
func NewEventStreamRepository(connectionString string, poolName string, bucketName string, prefix string) (*EventStreamRepository, error) {
c, err := couchbase.Connect(connectionString)
if err != nil {
log.Println(fmt.Sprintf("Error connecting to couchbase : %v", err))
return nil, err
}
pool, err := c.GetPool(poolName)
if err != nil {
log.Println(fmt.Sprintf("Error getting pool: %v", err))
return nil, err
}
bucket, err := pool.GetBucket(bucketName)
if err != nil {
log.Println(fmt.Sprintf("Error getting bucket: %v", err))
return nil, err
}
return &EventStreamRepository{bucket, prefix}, nil
}
// Save persists an event sourced object into the repository
func (r *EventStreamRepository) Save(sourceID string, events []cqrs.VersionedEvent) error {
latestVersion := events[len(events)-1].Version
for _, versionedEvent := range events {
key := fmt.Sprintf("%s:%s:%d", r.cbPrefix, sourceID, versionedEvent.Version)
added, err := r.bucket.Add(key, 0, versionedEvent)
if err != nil {
return err
}
if !added {
return cqrs.ErrConcurrencyWhenSavingEvents
}
if err := r.SaveIntegrationEvent(versionedEvent); err != nil {
return err
}
}
cbKey := fmt.Sprintf("%s:%s", r.cbPrefix, sourceID)
return r.bucket.Set(cbKey, 0, latestVersion)
}
// SaveIntegrationEvent persists a published integration event
func (r *EventStreamRepository) SaveIntegrationEvent(event cqrs.VersionedEvent) error {
counter, err := r.bucket.Incr("eventstore:integration", 1, 1, 0)
if err != nil {
return err
}
key := fmt.Sprintf("eventstore:integration:%d", counter)
if err = r.bucket.Set(key, 0, event); err != nil {
return err
}
var eventsByCorrelationID map[string]cqrs.VersionedEvent
correlationKey := "eventstore:correlation:" + event.CorrelationID
if err := r.bucket.Get(correlationKey, &eventsByCorrelationID); err != nil {
if IsNotFoundError(err) {
eventsByCorrelationID = make(map[string]cqrs.VersionedEvent)
} else {
return err
}
}
eventsByCorrelationID[event.ID] = event
if err := r.bucket.Set(correlationKey, 0, eventsByCorrelationID); err != nil {
return err
}
return nil
}
// GetIntegrationEventsByCorrelationID returns all integration events by correlation ID
func (r *EventStreamRepository) GetIntegrationEventsByCorrelationID(correlationID string) ([]cqrs.VersionedEvent, error) {
var eventsByCorrelationID map[string]cbVersionedEvent
correlationKey := "eventstore:correlation:" + correlationID
if err := r.bucket.Get(correlationKey, &eventsByCorrelationID); err != nil {
return nil, err
}
typeRegistry := cqrs.NewTypeRegistry()
var events []cqrs.VersionedEvent
for _, raw := range eventsByCorrelationID {
eventType, ok := typeRegistry.GetTypeByName(raw.EventType)
if !ok {
log.Println("Cannot find event type", raw.EventType)
return nil, errors.New("Cannot find event type " + raw.EventType)
}
eventValue := reflect.New(eventType)
event := eventValue.Interface()
if err := json.Unmarshal(raw.Event, event); err != nil {
log.Println("Error deserializing event ", raw.Event)
return nil, err
}
versionedEvent := cqrs.VersionedEvent{
ID: raw.ID,
SourceID: raw.SourceID,
Version: raw.Version,
EventType: raw.EventType,
Created: raw.Created,
Event: reflect.Indirect(eventValue).Interface()}
events = append(events, versionedEvent)
}
return events, nil
}
// AllIntegrationEventsEverPublished retreives all events every persisted
func (r *EventStreamRepository) AllIntegrationEventsEverPublished() ([]cqrs.VersionedEvent, error) {
var counter int
if err := r.bucket.Get("integration", &counter); err != nil {
return nil, err
}
var result []cqrs.VersionedEvent
for i := 0; i < counter; i++ {
key := fmt.Sprintf("integration::%d", i)
events, err := r.Get(key, 0)
if err != nil {
return nil, err
}
for _, event := range events {
result = append(result, event)
}
}
sort.Sort(cqrs.ByCreated(result))
return result, nil
}
func (r *EventStreamRepository) GetSnapshot(id string) (cqrs.EventSourced, error) {
return nil, nil
}
func (r *EventStreamRepository) SaveSnapshot(eventsourced cqrs.EventSourced) error {
return nil
}
// Get retrieves events assoicated with an event sourced object by ID
func (r *EventStreamRepository) Get(id string, fromVersion int) ([]cqrs.VersionedEvent, error) {
var version int
cbKey := fmt.Sprintf("%s:%s", r.cbPrefix, id)
if error := r.bucket.Get(cbKey, &version); error != nil {
log.Println("Error getting event source ", id)
return nil, error
}
var events []cqrs.VersionedEvent
for versionNumber := 1; versionNumber <= version; versionNumber++ {
eventKey := fmt.Sprintf("%s:%s:%d", r.cbPrefix, id, versionNumber)
raw := new(cbVersionedEvent)
if error := r.bucket.Get(eventKey, raw); error != nil {
log.Println("Error getting event :", eventKey)
return nil, error
}
typeRegistry := cqrs.NewTypeRegistry()
eventType, ok := typeRegistry.GetTypeByName(raw.EventType)
if !ok {
log.Println("Cannot find event type", raw.EventType)
return nil, errors.New("Cannot find event type " + raw.EventType)
}
eventValue := reflect.New(eventType)
event := eventValue.Interface()
if err := json.Unmarshal(raw.Event, event); err != nil {
log.Println("Error deserializing event ", raw.Event)
return nil, err
}
versionedEvent := cqrs.VersionedEvent{
ID: raw.ID,
SourceID: raw.SourceID,
Version: raw.Version,
EventType: raw.EventType,
Created: raw.Created,
Event: reflect.Indirect(eventValue).Interface()}
events = append(events, versionedEvent)
}
return events, nil
}
// NotFound error string returned from couchbase when a key cannot be found
const NotFound string = "Not found"
// IsNotFoundError checks if we get a key not found error from couchbase
func IsNotFoundError(err error) bool {
// No error?
if err == nil {
return false
}
return strings.Contains(err.Error(), NotFound)
}