-
Notifications
You must be signed in to change notification settings - Fork 18
/
deserialize.go
86 lines (72 loc) · 1.79 KB
/
deserialize.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
package broker
import (
"context"
"fmt"
"code.vegaprotocol.io/vega/core/events"
"code.vegaprotocol.io/vega/libs/proto"
eventspb "code.vegaprotocol.io/vega/protos/vega/events/v1"
)
type Deserializer struct {
source RawEventReceiver
}
func NewDeserializer(source RawEventReceiver) *Deserializer {
return &Deserializer{
source: source,
}
}
func (e *Deserializer) Listen() error {
return e.source.Listen()
}
func (e *Deserializer) Receive(ctx context.Context) (<-chan events.Event, <-chan error) {
in, inErr := e.source.Receive(ctx)
out := make(chan events.Event)
outErr := make(chan error)
go func() {
defer close(out)
defer close(outErr)
for {
select {
case rawEvent, ok := <-in:
if !ok {
return
}
event, err := deserializeEvent(rawEvent)
if err != nil {
outErr <- err
return
}
// Listen for context cancels, even if we're blocked sending events
select {
case out <- event:
case <-ctx.Done():
return
}
case err, ok := <-inErr:
if !ok {
return
}
// Listen for context cancels, even if we're blocked sending events
select {
case outErr <- err:
case <-ctx.Done():
return
}
}
}
}()
return out, outErr
}
func deserializeEvent(rawEvent []byte) (events.Event, error) {
busEvent := &eventspb.BusEvent{}
if err := proto.Unmarshal(rawEvent, busEvent); err != nil {
return nil, fmt.Errorf("failed to unmarshal bus event: %w", err)
}
if busEvent.Version != eventspb.Version {
return nil, fmt.Errorf("mismatched BusEvent version received: %d, want %d", busEvent.Version, eventspb.Version)
}
event := toEvent(context.Background(), busEvent)
if event == nil {
return nil, fmt.Errorf("Can not convert proto '%s' event to internal event", busEvent.GetType().String())
}
return event, nil
}