mirror of https://github.com/status-im/go-waku.git
139 lines
3.2 KiB
Go
139 lines
3.2 KiB
Go
package main
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"fmt"
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"net"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/waku-org/go-waku/waku/v2/node"
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"github.com/waku-org/go-waku/waku/v2/payload"
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"github.com/waku-org/go-waku/waku/v2/protocol"
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"github.com/waku-org/go-waku/waku/v2/protocol/pb"
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"github.com/waku-org/go-waku/waku/v2/utils"
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"go.uber.org/zap"
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)
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var log = utils.Logger().Named("basic2")
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func main() {
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var cTopic, err = protocol.NewContentTopic("basic2", 1, "test", "proto")
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if err != nil {
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fmt.Println("Invalid contentTopic")
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return
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}
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contentTopic := cTopic.String()
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hostAddr, _ := net.ResolveTCPAddr("tcp", "0.0.0.0:0")
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key, err := randomHex(32)
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if err != nil {
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log.Error("Could not generate random key", zap.Error(err))
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return
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}
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prvKey, err := crypto.HexToECDSA(key)
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if err != nil {
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log.Error("Could not convert hex into ecdsa key", zap.Error(err))
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return
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}
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ctx := context.Background()
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wakuNode, err := node.New(
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node.WithPrivateKey(prvKey),
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node.WithHostAddress(hostAddr),
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node.WithNTP(),
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node.WithWakuRelay(),
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)
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if err != nil {
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log.Error("Error creating wakunode", zap.Error(err))
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return
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}
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if err := wakuNode.Start(ctx); err != nil {
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log.Error("Error starting wakunode", zap.Error(err))
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return
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}
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go writeLoop(ctx, wakuNode, contentTopic)
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go readLoop(ctx, wakuNode, contentTopic)
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// Wait for a SIGINT or SIGTERM signal
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ch := make(chan os.Signal, 1)
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signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
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<-ch
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fmt.Println("\n\n\nReceived signal, shutting down...")
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// shut the node down
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wakuNode.Stop()
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}
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func randomHex(n int) (string, error) {
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bytes := make([]byte, n)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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func write(ctx context.Context, wakuNode *node.WakuNode, contentTopic string, msgContent string) {
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var version uint32 = 0
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var timestamp int64 = utils.GetUnixEpoch(wakuNode.Timesource())
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p := new(payload.Payload)
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p.Data = []byte(wakuNode.ID() + ": " + msgContent)
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p.Key = &payload.KeyInfo{Kind: payload.None}
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payload, err := p.Encode(version)
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if err != nil {
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log.Error("Error encoding the payload", zap.Error(err))
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return
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}
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msg := &pb.WakuMessage{
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Payload: payload,
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Version: version,
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ContentTopic: contentTopic,
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Timestamp: timestamp,
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}
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_, err = wakuNode.Relay().Publish(ctx, msg)
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if err != nil {
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log.Error("Error sending a message", zap.Error(err))
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}
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}
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func writeLoop(ctx context.Context, wakuNode *node.WakuNode, contentTopic string) {
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for {
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time.Sleep(2 * time.Second)
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write(ctx, wakuNode, contentTopic, "Hello world!")
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}
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}
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func readLoop(ctx context.Context, wakuNode *node.WakuNode, contentTopic string) {
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sub, err := wakuNode.Relay().Subscribe(ctx)
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if err != nil {
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log.Error("Could not subscribe", zap.Error(err))
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return
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}
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for envelope := range sub.Ch {
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if envelope.Message().ContentTopic != contentTopic {
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continue
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}
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payload, err := payload.DecodePayload(envelope.Message(), &payload.KeyInfo{Kind: payload.None})
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if err != nil {
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log.Error("Error decoding payload", zap.Error(err))
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continue
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}
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log.Info("Received msg, ", zap.String("data", string(payload.Data)))
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}
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}
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