-
Notifications
You must be signed in to change notification settings - Fork 1
/
handlers.go
62 lines (51 loc) · 1.88 KB
/
handlers.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
package transport
import (
"fmt"
"google.golang.org/protobuf/proto"
"sync"
)
// MessageHandler defines the function signature for a handler that processes a protobuf message.
type MessageHandler func(msg proto.Message)
// HandlerRegistry holds registered handlers for protobuf messages.
type HandlerRegistry struct {
errorOnNoHandlers bool
mu sync.RWMutex
handlers map[string][]MessageHandler
}
// New creates a new instance of HandlerRegistry. Set errorOnNoHandler to true if you want HandleMessage to return
// an error if there are no handlers registered for a given msg when HandleMessage is called.
func NewHandlerRegistry(errorOnNoHandler bool) *HandlerRegistry {
return &HandlerRegistry{
errorOnNoHandlers: errorOnNoHandler,
handlers: make(map[string][]MessageHandler),
}
}
// RegisterHandler registers a handler for a specific protobuf message type.
func (r *HandlerRegistry) RegisterHandler(msg proto.Message, handler MessageHandler) {
r.mu.Lock()
defer r.mu.Unlock()
msgName := proto.MessageName(msg)
if msgName == "" {
return // Could not get message name; consider logging or handling the error
}
name := string(msgName)
r.handlers[name] = append(r.handlers[name], handler)
}
// HandleMessage invokes all registered handlers for the provided protobuf message, in the order they were registered.
func (r *HandlerRegistry) HandleMessage(msg proto.Message) error {
r.mu.RLock()
defer r.mu.RUnlock()
msgName := proto.MessageName(msg)
if msgName == "" {
return fmt.Errorf("failed to get message name for type: %T", msg) // Could not get message name; consider logging or handling the error
}
name := string(msgName)
if handlers, exists := r.handlers[name]; exists {
for _, handler := range handlers {
go handler(msg)
}
} else if r.errorOnNoHandlers {
return fmt.Errorf("no handlers registered for message: %s", msgName)
}
return nil
}