ceremonyclient/go-libp2p/examples/ipfs-camp-2019/08-End/pubsub.go

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2023-08-21 03:50:38 +00:00
package main
import (
"context"
"fmt"
"os"
"github.com/gogo/protobuf/proto"
pubsub "github.com/libp2p/go-libp2p-pubsub"
peer "github.com/libp2p/go-libp2p/core/peer"
)
var handles = map[string]string{}
const pubsubTopic = "/libp2p/example/chat/1.0.0"
func pubsubMessageHandler(id peer.ID, msg *SendMessage) {
handle, ok := handles[id.String()]
if !ok {
handle = id.ShortString()
}
fmt.Printf("%s: %s\n", handle, msg.Data)
}
func pubsubUpdateHandler(id peer.ID, msg *UpdatePeer) {
oldHandle, ok := handles[id.String()]
if !ok {
oldHandle = id.ShortString()
}
handles[id.String()] = string(msg.UserHandle)
fmt.Printf("%s -> %s\n", oldHandle, msg.UserHandle)
}
func pubsubHandler(ctx context.Context, sub *pubsub.Subscription) {
defer sub.Cancel()
for {
msg, err := sub.Next(ctx)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
req := &Request{}
err = proto.Unmarshal(msg.Data, req)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
switch *req.Type {
case Request_SEND_MESSAGE:
pubsubMessageHandler(msg.GetFrom(), req.SendMessage)
case Request_UPDATE_PEER:
pubsubUpdateHandler(msg.GetFrom(), req.UpdatePeer)
}
}
}