go-dvote/net/swarm/swarm.go
net/swarm/swarm.goRaw
1package swarm
2
3import (
4 "context"
5 "crypto/ecdsa"
6 "fmt"
7 "os"
8 "os/user"
9 "strings"
10 "time"
11
12 "github.com/ethereum/go-ethereum/common/hexutil"
13 "github.com/ethereum/go-ethereum/node"
14
15 "github.com/ethereum/go-ethereum/crypto"
16 "github.com/ethereum/go-ethereum/p2p"
17
18 "github.com/ethereum/go-ethereum/log"
19 "github.com/ethereum/go-ethereum/p2p/enode"
20 "github.com/ethereum/go-ethereum/swarm"
21
22 swarmapi "github.com/ethereum/go-ethereum/swarm/api"
23 "github.com/ethereum/go-ethereum/swarm/network"
24 "github.com/ethereum/go-ethereum/swarm/pss"
25)
26
27const (
28 // MaxPeers is the maximum number of p2p peer connections
29 MaxPeers = 10
30)
31
32// SwarmBootnodes list of bootnodes for the SWARM network
33var SwarmBootnodes = []string{
34 // EF Swarm Bootnode - AWS - eu-central-1
35 "enode://4c113504601930bf2000c29bcd98d1716b6167749f58bad703bae338332fe93cc9d9204f08afb44100dc7bea479205f5d162df579f9a8f76f8b402d339709023@3.122.203.99:30301",
36 // EF Swarm Bootnode - AWS - us-west-2
37 "enode://89f2ede3371bff1ad9f2088f2012984e280287a4e2b68007c2a6ad994909c51886b4a8e9e2ecc97f9910aca538398e0a5804b0ee80a187fde1ba4f32626322ba@52.35.212.179:30301",
38}
39
40func newNode(key *ecdsa.PrivateKey, port int, httpport int, wsport int,
41 datadir string, modules ...string) (*node.Node, *node.Config, error) {
42 if port == 0 {
43 port = 30100
44 }
45 cfg := &node.DefaultConfig
46 if key != nil {
47 cfg.P2P.PrivateKey = key
48 }
49 cfg.P2P.MaxPeers = MaxPeers
50 cfg.P2P.ListenAddr = fmt.Sprintf("0.0.0.0:%d", port)
51 cfg.P2P.EnableMsgEvents = true
52 cfg.P2P.NoDiscovery = false
53 cfg.P2P.DiscoveryV5 = true
54 cfg.IPCPath = datadir + "/node.ipc"
55 cfg.DataDir = datadir
56 if httpport > 0 {
57 cfg.HTTPHost = node.DefaultHTTPHost
58 cfg.HTTPPort = httpport
59 cfg.HTTPCors = []string{"*"}
60 }
61 if wsport > 0 {
62 cfg.WSHost = node.DefaultWSHost
63 cfg.WSPort = wsport
64 cfg.WSOrigins = []string{"*"}
65 for i := 0; i < len(modules); i++ {
66 cfg.WSModules = append(cfg.WSModules, modules[i])
67 }
68 }
69 stack, err := node.New(cfg)
70 if err != nil {
71 return nil, nil, fmt.Errorf("ServiceNode create fail: %v", err)
72 }
73 return stack, cfg, nil
74}
75
76func newSwarm(privkey *ecdsa.PrivateKey, datadir string, port int) (*swarm.Swarm, *swarmapi.Config, node.ServiceConstructor) {
77 // create swarm service
78 swarmCfg := swarmapi.NewConfig()
79 swarmCfg.SyncEnabled = true
80 swarmCfg.Port = fmt.Sprintf("%d", port)
81 swarmCfg.Path = datadir
82 swarmCfg.HiveParams.Discovery = true
83 swarmCfg.Discovery = true
84 swarmCfg.Pss.MsgTTL = time.Second * 10
85 swarmCfg.Pss.CacheTTL = time.Second * 30
86 swarmCfg.Pss.AllowRaw = true
87 swarmCfg.Init(privkey)
88 swarmNode, err := swarm.NewSwarm(swarmCfg, nil)
89 if err != nil {
90 log.Crit("cannot crate swarm node")
91 }
92 // register swarm service to the node
93 var swarmService node.ServiceConstructor = func(ctx *node.ServiceContext) (node.Service, error) {
94 return swarmNode, nil
95 }
96 return swarmNode, swarmCfg, swarmService
97}
98
99type swarmPorts struct {
100 WebSockets int
101 HTTPRPC int
102 Bzz int
103 P2P int
104}
105
106func NewSwarmPorts() *swarmPorts {
107 sp := new(swarmPorts)
108 sp.WebSockets = 8544
109 sp.HTTPRPC = 8543
110 sp.Bzz = 8542
111 sp.P2P = 31000
112 return sp
113}
114
115type pssMsg struct {
116 Msg []byte
117 Peer *p2p.Peer
118 Asym bool
119 Keyid string
120}
121
122type pssSub struct {
123 Unregister func()
124 Delivery (chan pssMsg)
125 Address string
126}
127
128type SwarmNet struct {
129 Node *node.Node
130 NodeConfig *node.Config
131 EnodeID string
132 Datadir string
133 Key *ecdsa.PrivateKey
134 Pss *pss.API
135 PssPubKey string
136 PssAddr pss.PssAddress
137 PssTopics map[string]*pssSub
138 Hive *network.Hive
139 Ports *swarmPorts
140}
141
142func (sn *SwarmNet) SetLog(level string) error {
143 // ensure good log formats for terminal
144 // handle verbosity flag
145 loglevel, err := log.LvlFromString(level)
146 if err != nil {
147 return err
148 }
149 hs := log.StreamHandler(os.Stderr, log.TerminalFormat(true))
150 hf := log.LvlFilterHandler(loglevel, hs)
151 h := log.CallerFileHandler(hf)
152 log.Root().SetHandler(h)
153 return nil
154}
155
156func (sn *SwarmNet) PrintStats() {
157 // statistics thread
158 go func() {
159 for {
160 if sn.Node.Server() != nil && sn.Hive != nil {
161 addr := fmt.Sprintf("%x", sn.PssAddr)
162 var addrs [][]byte
163 addrs = append(addrs, []byte(addr))
164 peerCount := sn.Node.Server().PeerCount()
165 log.Info(fmt.Sprintf("PeerCount:%d NeighDepth:%d", peerCount, sn.Hive.NeighbourhoodDepth))
166 }
167 time.Sleep(time.Second * 5)
168 }
169 }()
170}
171
172func (sn *SwarmNet) SetDatadir(datadir string) {
173 sn.Datadir = datadir
174}
175
176func (sn *SwarmNet) SetKey(key *ecdsa.PrivateKey) {
177 sn.Key = key
178}
179
180func (sn *SwarmNet) Init() error {
181 var err error
182 if len(sn.Datadir) < 1 {
183 usr, err := user.Current()
184 if err != nil {
185 return err
186 }
187 sn.Datadir = usr.HomeDir + "/.dvote/swarm"
188 os.MkdirAll(sn.Datadir, 0755)
189 }
190
191 sn.SetLog("info")
192 sn.Ports = NewSwarmPorts()
193
194 // create node
195 sn.Node, sn.NodeConfig, err = newNode(sn.Key, sn.Ports.P2P,
196 sn.Ports.HTTPRPC, sn.Ports.WebSockets, sn.Datadir, "pss")
197 if err != nil {
198 return err
199 }
200 // set node key, if not set use the storage one or generate it
201 if sn.Key == nil {
202 sn.Key = sn.NodeConfig.NodeKey()
203 }
204
205 // create and register Swarm service
206 swarmNode, _, swarmHandler := newSwarm(sn.Key, sn.Datadir, sn.Ports.Bzz)
207 err = sn.Node.Register(swarmHandler)
208 if err != nil {
209 return fmt.Errorf("swarm register fail %v", err)
210 }
211
212 // start the node
213 sn.Node.Start()
214 for _, url := range SwarmBootnodes {
215 log.Info("Add bootnode " + url)
216 node, _ := enode.ParseV4(url)
217 sn.Node.Server().AddPeer(node)
218 }
219
220 // wait to connect to the p2p network
221 _, cancel := context.WithTimeout(context.Background(), time.Second)
222 defer cancel()
223 time.Sleep(time.Second * 5)
224
225 // Get the services API
226 for _, a := range swarmNode.APIs() {
227 switch a.Service.(type) {
228 case *network.Hive:
229 sn.Hive = a.Service.(*network.Hive)
230 case *pss.API:
231 sn.Pss = a.Service.(*pss.API)
232 }
233 }
234
235 // Create topics map
236 sn.PssTopics = make(map[string]*pssSub)
237
238 // Set some extra data
239 sn.EnodeID = sn.Node.Server().NodeInfo().Enode
240 sn.PssPubKey = hexutil.Encode(crypto.FromECDSAPub(sn.Pss.PublicKey()))
241 sn.PssAddr, err = sn.Pss.BaseAddr()
242 if err != nil {
243 return fmt.Errorf("pss API fail %v", err)
244 }
245
246 // Print some information
247 log.Info(fmt.Sprintf("My PSS pubkey is %s", sn.PssPubKey))
248 log.Info(fmt.Sprintf("My PSS address is %x", sn.PssAddr))
249
250 // Run statistics goroutine
251 sn.PrintStats()
252
253 return nil
254}
255
256func strTopic(topic string) pss.Topic {
257 return pss.BytesToTopic([]byte(topic))
258}
259
260func strSymKey(key string) []byte {
261 symKey := make([]byte, 32)
262 copy(symKey, []byte(key))
263 return symKey
264}
265
266func strAddress(addr string) pss.PssAddress {
267 var pssAddress pss.PssAddress
268 pssAddress = []byte(addr)
269 return pssAddress
270}
271
272func (sn *SwarmNet) PssSub(subType, key, topic, address string) error {
273 pssTopic := strTopic(topic)
274 pssAddress := strAddress(address)
275 if subType == "sym" {
276 _, err := sn.Pss.SetSymmetricKey(strSymKey(key), pssTopic, pssAddress, true)
277 if err != nil {
278 return err
279 }
280 }
281
282 sn.PssTopics[topic] = new(pssSub)
283 sn.PssTopics[topic].Address = address
284 sn.PssTopics[topic].Delivery = make(chan pssMsg)
285
286 var pssHandler pss.HandlerFunc = func(msg []byte, peer *p2p.Peer, asym bool, keyid string) error {
287 log.Debug("pss received", "msg", fmt.Sprintf("%s", msg), "keyid", fmt.Sprintf("%s", keyid))
288
289 sn.PssTopics[topic].Delivery <- pssMsg{Msg: msg, Peer: peer, Asym: asym, Keyid: keyid}
290 return nil
291 }
292 topicHandler := pss.NewHandler(pssHandler)
293 if subType == "raw" {
294 topicHandler = topicHandler.WithProxBin().WithRaw()
295 }
296 sn.PssTopics[topic].Unregister = sn.Pss.Register(&pssTopic, topicHandler)
297
298 log.Info(fmt.Sprintf("Subscribed to [%s] topic %s", subType, pssTopic.String()))
299 return nil
300}
301
302func (sn *SwarmNet) PssPub(subType, key, topic, msg, address string) error {
303 var err error
304 dstAddr := strAddress(address)
305 dstTopic := strTopic(topic)
306 if subType == "sym" {
307 symKeyId, err := sn.Pss.SetSymmetricKey(strSymKey(key), dstTopic, dstAddr, false)
308 if err != nil {
309 return err
310 }
311 // send symetric message
312 err = sn.Pss.SendSym(symKeyId, strTopic(topic), hexutil.Bytes(msg))
313 }
314 if subType == "raw" {
315 // sed raw message
316 err = sn.Pss.SendRaw(hexutil.Bytes(address), dstTopic, hexutil.Bytes(msg))
317 }
318 if subType == "asym" {
319 // add 0x prefix if not present
320 if hasHexPrefix := strings.HasPrefix(key, "0x"); !hasHexPrefix {
321 key = "0x" + key
322 }
323
324 // check if topic+address is already set for a pubKey
325 _, err := sn.Pss.GetPeerAddress(key, dstTopic)
326 if err != nil {
327 pubKeyBytes, err := hexutil.Decode(key)
328 if err != nil {
329 return err
330 }
331 err = sn.Pss.SetPeerPublicKey(pubKeyBytes, dstTopic, dstAddr)
332 if err != nil {
333 return err
334 }
335 }
336
337 // send asymetric message
338 err = sn.Pss.SendAsym(key, dstTopic, hexutil.Bytes(msg))
339 }
340 return err
341}