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-rw-r--r--whisper/whisperv2/main.go106
1 files changed, 106 insertions, 0 deletions
diff --git a/whisper/whisperv2/main.go b/whisper/whisperv2/main.go
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+++ b/whisper/whisperv2/main.go
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+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build none
+
+// Contains a simple whisper peer setup and self messaging to allow playing
+// around with the protocol and API without a fancy client implementation.
+
+package main
+
+import (
+ "fmt"
+ "log"
+ "os"
+ "time"
+
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/crypto"
+ "github.com/ethereum/go-ethereum/logger"
+ "github.com/ethereum/go-ethereum/p2p"
+ "github.com/ethereum/go-ethereum/p2p/nat"
+ "github.com/ethereum/go-ethereum/whisper"
+)
+
+func main() {
+ logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, log.LstdFlags, logger.InfoLevel))
+
+ // Generate the peer identity
+ key, err := crypto.GenerateKey()
+ if err != nil {
+ fmt.Printf("Failed to generate peer key: %v.\n", err)
+ os.Exit(-1)
+ }
+ name := common.MakeName("whisper-go", "1.0")
+ shh := whisper.New()
+
+ // Create an Ethereum peer to communicate through
+ server := p2p.Server{
+ PrivateKey: key,
+ MaxPeers: 10,
+ Name: name,
+ Protocols: []p2p.Protocol{shh.Protocol()},
+ ListenAddr: ":30300",
+ NAT: nat.Any(),
+ }
+ fmt.Println("Starting Ethereum peer...")
+ if err := server.Start(); err != nil {
+ fmt.Printf("Failed to start Ethereum peer: %v.\n", err)
+ os.Exit(1)
+ }
+
+ // Send a message to self to check that something works
+ payload := fmt.Sprintf("Hello world, this is %v. In case you're wondering, the time is %v", name, time.Now())
+ if err := selfSend(shh, []byte(payload)); err != nil {
+ fmt.Printf("Failed to self message: %v.\n", err)
+ os.Exit(-1)
+ }
+}
+
+// SendSelf wraps a payload into a Whisper envelope and forwards it to itself.
+func selfSend(shh *whisper.Whisper, payload []byte) error {
+ ok := make(chan struct{})
+
+ // Start watching for self messages, output any arrivals
+ id := shh.NewIdentity()
+ shh.Watch(whisper.Filter{
+ To: &id.PublicKey,
+ Fn: func(msg *whisper.Message) {
+ fmt.Printf("Message received: %s, signed with 0x%x.\n", string(msg.Payload), msg.Signature)
+ close(ok)
+ },
+ })
+ // Wrap the payload and encrypt it
+ msg := whisper.NewMessage(payload)
+ envelope, err := msg.Wrap(whisper.DefaultPoW, whisper.Options{
+ From: id,
+ To: &id.PublicKey,
+ TTL: whisper.DefaultTTL,
+ })
+ if err != nil {
+ return fmt.Errorf("failed to seal message: %v", err)
+ }
+ // Dump the message into the system and wait for it to pop back out
+ if err := shh.Send(envelope); err != nil {
+ return fmt.Errorf("failed to send self-message: %v", err)
+ }
+ select {
+ case <-ok:
+ case <-time.After(time.Second):
+ return fmt.Errorf("failed to receive message in time")
+ }
+ return nil
+}