/
event_store.go
245 lines (208 loc) · 6.89 KB
/
event_store.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
package eventstore_db
import (
"context"
"github.com/EventStore/EventStore-Client-Go/v2/esdb"
"github.com/discomco/go-cart/sdk/comps"
sdk_errors "github.com/discomco/go-cart/sdk/core/errors"
"github.com/discomco/go-cart/sdk/core/logger"
"github.com/discomco/go-cart/sdk/drivers/convert"
"io"
"github.com/discomco/go-cart/sdk/behavior"
"github.com/discomco/go-cart/sdk/drivers/jaeger"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/log"
"github.com/pkg/errors"
)
type eventStore struct {
log logger.IAppLogger
db *esdb.Client
}
func newEventStore(log logger.IAppLogger, db *esdb.Client) comps.IEventStore {
return &eventStore{log: log, db: db}
}
func EventStore(log logger.IAppLogger, newClient EventStoreDBFtor) comps.EventStoreFtor {
return func() comps.IEventStore {
db := newClient()
return newEventStore(log, db)
}
}
func (es *eventStore) SaveSnapshot(ctx context.Context, aggregate behavior.IBehavior) error {
panic("not implemented")
//streamID := aggregate.GetID()
//span, ctx := opentracing.StartSpanFromContext(ctx, "eventStore.SaveSnapShot")
//defer span.Finish()
//span.LogFields(log.String("aggregateID", streamID.Id()))
// es.db.AppendToStream()
}
func (es *eventStore) GetSnapshot(ctx context.Context, id string) (*behavior.Snapshot, error) {
//TODO implement me
panic("implement me")
}
func (es *eventStore) SaveEvents(ctx context.Context, streamID string, events []behavior.IEvt) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "eventStore.SaveEvents")
defer span.Finish()
span.LogFields(log.String("aggregateID", streamID))
eventsData := make([]esdb.EventData, 0, len(events))
for _, event := range events {
eventsData = append(eventsData, convert.Evt2EventData(event))
}
stream, err := es.db.AppendToStream(ctx, streamID, esdb.AppendToStreamOptions{}, eventsData...)
if err != nil {
jaeger.TraceErr(span, err)
return err
}
es.log.Debugf("SaveEvents stream: %+v", stream)
return nil
}
func (es *eventStore) LoadEvents(ctx context.Context, streamID string) ([]behavior.IEvt, error) {
span, ctx := opentracing.StartSpanFromContext(ctx, "eventStore.Load")
defer span.Finish()
span.LogFields(log.String("aggregateID", streamID))
stream, err := es.db.ReadStream(ctx, streamID, esdb.ReadStreamOptions{
Direction: esdb.Forwards,
From: esdb.Revision(1),
}, 100)
if err != nil {
jaeger.TraceErr(span, err)
return nil, err
}
defer stream.Close()
events := make([]behavior.IEvt, 0, 100)
for {
event, err := stream.Recv()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
jaeger.TraceErr(span, err)
return nil, err
}
events = append(events, convert.Recorded2Evt(event.Event))
}
return events, nil
}
func (es *eventStore) Load(ctx context.Context, aggregate behavior.IBehavior) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "evtStoreDB.Load")
defer span.Finish()
span.LogFields(log.String("aggregateID", aggregate.GetID().Id()))
stream, err := es.db.ReadStream(ctx, aggregate.GetID().Id(), esdb.ReadStreamOptions{}, count)
if err != nil {
jaeger.TraceErr(span, err)
return errors.Wrap(err, "db.ReadStream")
}
defer stream.Close()
for {
event, err := stream.Recv()
if err != nil {
esdbErr, ok := esdb.FromError(err)
if !ok && esdbErr.Code() == esdb.ErrorResourceNotFound {
err := sdk_errors.ErrStreamNotFound
jaeger.TraceErr(span, err)
return errors.Wrap(err, "stream.Recv")
}
if errors.Is(err, io.EOF) {
break
}
if err != nil {
jaeger.TraceErr(span, err)
return errors.Wrap(err, "stream.Recv")
}
}
esEvent := convert.Recorded2Evt(event.Event)
if err := aggregate.RaiseEvent(esEvent); err != nil {
jaeger.TraceErr(span, err)
return errors.Wrap(err, "RaiseEvent")
}
es.log.Debugf("(Load) esEvent: {%s}", esEvent.String())
}
es.log.Debugf("(Load) domain: {%s}", aggregate.String())
return nil
}
func (es *eventStore) Save(ctx context.Context, aggregate behavior.IBehavior) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "evtStoreDB.Save")
defer span.Finish()
span.LogFields(log.String("behavior", aggregate.String()))
if len(aggregate.GetUncommittedEvents()) == 0 {
es.log.Debugf("(Save) [no uncommittedEvents] len: {%d}", len(aggregate.GetUncommittedEvents()))
return nil
}
eventsData := make([]esdb.EventData, 0, len(aggregate.GetUncommittedEvents()))
for _, event := range aggregate.GetUncommittedEvents() {
eventsData = append(eventsData, convert.Evt2EventData(event))
}
// check for domain.GetVersion() == 0 or len(domain.GetAppliedEvents()) == 0 means new domain
var expectedRevision esdb.ExpectedRevision
if aggregate.GetVersion() == 0 {
expectedRevision = esdb.NoStream{}
es.log.Debugf("(Save) expectedRevision: {%TA}", expectedRevision)
appendStream, err := es.db.AppendToStream(
ctx,
aggregate.GetID().Id(),
esdb.AppendToStreamOptions{ExpectedRevision: expectedRevision},
eventsData...,
)
if err != nil {
jaeger.TraceErr(span, err)
return errors.Wrap(err, "db.AppendToStream")
}
es.log.Debugf("(Save) stream: {%+v}", appendStream)
return nil
}
readOps := esdb.ReadStreamOptions{Direction: esdb.Backwards, From: esdb.End{}}
stream, err := es.db.ReadStream(context.Background(), aggregate.GetID().Id(), readOps, 1)
if err != nil {
jaeger.TraceErr(span, err)
return errors.Wrap(err, "db.ReadStream")
}
defer stream.Close()
lastEvent, err := stream.Recv()
if err != nil {
jaeger.TraceErr(span, err)
return errors.Wrap(err, "stream.Recv")
}
expectedRevision = esdb.Revision(lastEvent.OriginalEvent().EventNumber)
es.log.Debugf("(Save) expectedRevision: {%TA}", expectedRevision)
appendStream, err := es.db.AppendToStream(
ctx,
aggregate.GetID().Id(),
esdb.AppendToStreamOptions{ExpectedRevision: expectedRevision},
eventsData...,
)
if err != nil {
jaeger.TraceErr(span, err)
return errors.Wrap(err, "db.AppendToStream")
}
es.log.Debugf("(Save) stream: {%+v}", appendStream)
aggregate.ClearUncommittedEvents()
return nil
}
func (es *eventStore) Close() error {
return es.db.Close()
}
// Exists checks whether the Event Stream identified by streamID exists in the EventStore.
func (es *eventStore) Exists(ctx context.Context, streamID string) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "evtStoreDB.Exists")
defer span.Finish()
span.LogFields(log.String("aggregateID", streamID))
readStreamOptions := esdb.ReadStreamOptions{Direction: esdb.Backwards, From: esdb.Revision(1)}
stream, err := es.db.ReadStream(ctx, streamID, readStreamOptions, 1)
if err != nil {
return errors.Wrap(err, "db.ReadStream")
}
defer stream.Close()
for {
_, err := stream.Recv()
if err != nil {
esdbErr, ok := esdb.FromError(err)
if !ok && esdbErr.Code() == esdb.ErrorResourceNotFound {
err = sdk_errors.ErrStreamNotFound
}
if errors.Is(err, io.EOF) {
break
}
jaeger.TraceErr(span, err)
return errors.Wrap(err, "stream.Recv")
}
}
return nil
}