status-go/vendor/github.com/libp2p/go-libp2p-pubsub/midgen.go

53 lines
1.1 KiB
Go

package pubsub
import (
"sync"
pb "github.com/libp2p/go-libp2p-pubsub/pb"
)
// msgIDGenerator handles computing IDs for msgs
// It allows setting custom generators(MsgIdFunction) per topic
type msgIDGenerator struct {
Default MsgIdFunction
topicGensLk sync.RWMutex
topicGens map[string]MsgIdFunction
}
func newMsgIdGenerator() *msgIDGenerator {
return &msgIDGenerator{
Default: DefaultMsgIdFn,
topicGens: make(map[string]MsgIdFunction),
}
}
// Set sets custom id generator(MsgIdFunction) for topic.
func (m *msgIDGenerator) Set(topic string, gen MsgIdFunction) {
m.topicGensLk.Lock()
m.topicGens[topic] = gen
m.topicGensLk.Unlock()
}
// ID computes ID for the msg or short-circuits with the cached value.
func (m *msgIDGenerator) ID(msg *Message) string {
if msg.ID != "" {
return msg.ID
}
msg.ID = m.RawID(msg.Message)
return msg.ID
}
// RawID computes ID for the proto 'msg'.
func (m *msgIDGenerator) RawID(msg *pb.Message) string {
m.topicGensLk.RLock()
gen, ok := m.topicGens[msg.GetTopic()]
m.topicGensLk.RUnlock()
if !ok {
gen = m.Default
}
return gen(msg)
}