How to use Write method of rpctype Package

Best Syzkaller code snippet using rpctype.Write

rpc.go

Source:rpc.go Github

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...55 r.sendError(conn, fmt.Sprintf("dial leader: %v", err))56 return57 }58 defer leaderConn.Close()59 leaderConn.Write([]byte{MuxRPCHeader})60 // re-write the original message to the leader61 leaderConn.Write(buf)62 if err := proxy(leaderConn.(*net.TCPConn), conn); err != nil {63 r.sendError(conn, fmt.Sprintf("leader proxy error: %v", err))64 }65}66// handleRPCConn reads a command from the connection and executes it.67func (r *rpc) handleRPCConn(conn net.Conn) {68 defer conn.Close()69 // RPC connections should execute on the leader. If we are not the leader,70 // proxy the connection to the leader so that clients an connect to any node71 // in the cluster.72 r.traceCluster("rpc connection from: %v", conn.RemoteAddr())73 // Read and execute request.74 typ, buf, err := r.readMessage(conn)75 // Handle unexpected RPC errors76 if err != nil {77 r.sendError(conn, err.Error())78 return79 }80 if !r.store.IsLeader() && typ != internal.RPCType_PromoteRaft {81 r.proxyLeader(conn.(*net.TCPConn), pack(typ, buf))82 return83 }84 typ, resp, err := r.executeMessage(conn, typ, buf)85 // Handle unexpected RPC errors86 if err != nil {87 r.sendError(conn, err.Error())88 return89 }90 // Set the status header and error message91 if reply, ok := resp.(Reply); ok {92 reply.GetHeader().OK = proto.Bool(err == nil)93 if err != nil {94 reply.GetHeader().Error = proto.String(err.Error())95 }96 }97 r.sendResponse(conn, typ, resp)98}99func (r *rpc) readMessage(conn net.Conn) (internal.RPCType, []byte, error) {100 // Read request size.101 var sz uint64102 if err := binary.Read(conn, binary.BigEndian, &sz); err != nil {103 return internal.RPCType_Error, nil, fmt.Errorf("read size: %s", err)104 }105 if sz == 0 {106 return internal.RPCType_Error, nil, fmt.Errorf("invalid message size: %d", sz)107 }108 if sz >= MaxMessageSize {109 return internal.RPCType_Error, nil, fmt.Errorf("max message size of %d exceeded: %d", MaxMessageSize, sz)110 }111 // Read request.112 buf := make([]byte, sz)113 if _, err := io.ReadFull(conn, buf); err != nil {114 return internal.RPCType_Error, nil, fmt.Errorf("read request: %s", err)115 }116 // Determine the RPC type117 rpcType := internal.RPCType(btou64(buf[0:8]))118 buf = buf[8:]119 r.traceCluster("recv %v request on: %v", rpcType, conn.RemoteAddr())120 return rpcType, buf, nil121}122func (r *rpc) executeMessage(conn net.Conn, rpcType internal.RPCType, buf []byte) (internal.RPCType, proto.Message, error) {123 switch rpcType {124 case internal.RPCType_FetchData:125 var req internal.FetchDataRequest126 if err := proto.Unmarshal(buf, &req); err != nil {127 return internal.RPCType_Error, nil, fmt.Errorf("fetch request unmarshal: %v", err)128 }129 resp, err := r.handleFetchData(&req)130 return rpcType, resp, err131 case internal.RPCType_Join:132 var req internal.JoinRequest133 if err := proto.Unmarshal(buf, &req); err != nil {134 return internal.RPCType_Error, nil, fmt.Errorf("join request unmarshal: %v", err)135 }136 resp, err := r.handleJoinRequest(&req)137 return rpcType, resp, err138 case internal.RPCType_PromoteRaft:139 var req internal.PromoteRaftRequest140 if err := proto.Unmarshal(buf, &req); err != nil {141 return internal.RPCType_Error, nil, fmt.Errorf("promote to raft request unmarshal: %v", err)142 }143 resp, err := r.handlePromoteRaftRequest(&req)144 return rpcType, resp, err145 default:146 return internal.RPCType_Error, nil, fmt.Errorf("unknown rpc type:%v", rpcType)147 }148}149func (r *rpc) sendResponse(conn net.Conn, typ internal.RPCType, resp proto.Message) {150 // Marshal the response back to a protobuf151 buf, err := proto.Marshal(resp)152 if err != nil {153 r.logger.Printf("unable to marshal response: %v", err)154 return155 }156 // Encode response back to connection.157 if _, err := conn.Write(pack(typ, buf)); err != nil {158 r.logger.Printf("unable to write rpc response: %s", err)159 }160}161func (r *rpc) sendError(conn net.Conn, msg string) {162 r.traceCluster(msg)163 resp := &internal.ErrorResponse{164 Header: &internal.ResponseHeader{165 OK: proto.Bool(false),166 Error: proto.String(msg),167 },168 }169 r.sendResponse(conn, internal.RPCType_Error, resp)170}171// handleFetchData handles a request for the current nodes meta data172func (r *rpc) handleFetchData(req *internal.FetchDataRequest) (*internal.FetchDataResponse, error) {173 var (174 b []byte175 data *Data176 err error177 )178 for {179 data = r.store.cachedData()180 if data.Index != req.GetIndex() {181 b, err = data.MarshalBinary()182 if err != nil {183 return nil, err184 }185 break186 }187 if !req.GetBlocking() {188 break189 }190 if err := r.store.WaitForDataChanged(); err != nil {191 return nil, err192 }193 }194 return &internal.FetchDataResponse{195 Header: &internal.ResponseHeader{196 OK: proto.Bool(true),197 },198 Index: proto.Uint64(data.Index),199 Term: proto.Uint64(data.Term),200 Data: b}, nil201}202// handleJoinRequest handles a request to join the cluster203func (r *rpc) handleJoinRequest(req *internal.JoinRequest) (*internal.JoinResponse, error) {204 r.traceCluster("join request from: %v", *req.Addr)205 node, err := func() (*NodeInfo, error) {206 // attempt to create the node207 node, err := r.store.CreateNode(*req.Addr)208 // if it exists, return the existing node209 if err == ErrNodeExists {210 node, err = r.store.NodeByHost(*req.Addr)211 if err != nil {212 return node, err213 }214 r.logger.Printf("existing node re-joined: id=%v addr=%v", node.ID, node.Host)215 } else if err != nil {216 return nil, fmt.Errorf("create node: %v", err)217 }218 peers, err := r.store.Peers()219 if err != nil {220 return nil, fmt.Errorf("list peers: %v", err)221 }222 // If we have less than 3 nodes, add them as raft peers if they are not223 // already a peer224 if len(peers) < MaxRaftNodes && !raft.PeerContained(peers, *req.Addr) {225 r.logger.Printf("adding new raft peer: nodeId=%v addr=%v", node.ID, *req.Addr)226 if err = r.store.AddPeer(*req.Addr); err != nil {227 return node, fmt.Errorf("add peer: %v", err)228 }229 }230 return node, err231 }()232 nodeID := uint64(0)233 if node != nil {234 nodeID = node.ID235 }236 if err != nil {237 return nil, err238 }239 // get the current raft peers240 peers, err := r.store.Peers()241 if err != nil {242 return nil, fmt.Errorf("list peers: %v", err)243 }244 return &internal.JoinResponse{245 Header: &internal.ResponseHeader{246 OK: proto.Bool(true),247 },248 EnableRaft: proto.Bool(raft.PeerContained(peers, *req.Addr)),249 RaftNodes: peers,250 NodeID: proto.Uint64(nodeID),251 }, err252}253func (r *rpc) handlePromoteRaftRequest(req *internal.PromoteRaftRequest) (*internal.PromoteRaftResponse, error) {254 r.traceCluster("promote raft request from: %v", *req.Addr)255 // Need to set the local store peers to match what we are about to join256 if err := r.store.SetPeers(req.RaftNodes); err != nil {257 return nil, err258 }259 if err := r.store.enableLocalRaft(); err != nil {260 return nil, err261 }262 if !contains(req.RaftNodes, *req.Addr) {263 req.RaftNodes = append(req.RaftNodes, *req.Addr)264 }265 if err := r.store.SetPeers(req.RaftNodes); err != nil {266 return nil, err267 }268 return &internal.PromoteRaftResponse{269 Header: &internal.ResponseHeader{270 OK: proto.Bool(true),271 },272 Success: proto.Bool(true),273 }, nil274}275// pack returns a TLV style byte slice encoding the size of the payload, the RPC type276// and the RPC data277func pack(typ internal.RPCType, b []byte) []byte {278 buf := u64tob(uint64(len(b)) + 8)279 buf = append(buf, u64tob(uint64(typ))...)280 buf = append(buf, b...)281 return buf282}283// fetchMetaData returns the latest copy of the meta store data from the current284// leader.285func (r *rpc) fetchMetaData(blocking bool) (*Data, error) {286 assert(r.store != nil, "store is nil")287 // Retrieve the current known leader.288 leader := r.store.Leader()289 if leader == "" {290 return nil, errors.New("no leader detected during fetchMetaData")291 }292 var index, term uint64293 data := r.store.cachedData()294 if data != nil {295 index = data.Index296 term = data.Index297 }298 resp, err := r.call(leader, &internal.FetchDataRequest{299 Index: proto.Uint64(index),300 Term: proto.Uint64(term),301 Blocking: proto.Bool(blocking),302 })303 if err != nil {304 return nil, err305 }306 switch t := resp.(type) {307 case *internal.FetchDataResponse:308 // If data is nil, then the term and index we sent matches the leader309 if t.GetData() == nil {310 return nil, nil311 }312 ms := &Data{}313 if err := ms.UnmarshalBinary(t.GetData()); err != nil {314 return nil, fmt.Errorf("rpc unmarshal metadata: %v", err)315 }316 return ms, nil317 case *internal.ErrorResponse:318 return nil, fmt.Errorf("rpc failed: %s", t.GetHeader().GetError())319 default:320 return nil, fmt.Errorf("rpc failed: unknown response type: %v", t.String())321 }322}323// join attempts to join a cluster at remoteAddr using localAddr as the current324// node's cluster address325func (r *rpc) join(localAddr, remoteAddr string) (*JoinResult, error) {326 req := &internal.JoinRequest{327 Addr: proto.String(localAddr),328 }329 resp, err := r.call(remoteAddr, req)330 if err != nil {331 return nil, err332 }333 switch t := resp.(type) {334 case *internal.JoinResponse:335 return &JoinResult{336 RaftEnabled: t.GetEnableRaft(),337 RaftNodes: t.GetRaftNodes(),338 NodeID: t.GetNodeID(),339 }, nil340 case *internal.ErrorResponse:341 return nil, fmt.Errorf("rpc failed: %s", t.GetHeader().GetError())342 default:343 return nil, fmt.Errorf("rpc failed: unknown response type: %v", t.String())344 }345}346// enableRaft attempts to promote a node at remoteAddr using localAddr as the current347// node's cluster address348func (r *rpc) enableRaft(addr string, peers []string) error {349 req := &internal.PromoteRaftRequest{350 Addr: proto.String(addr),351 RaftNodes: peers,352 }353 resp, err := r.call(addr, req)354 if err != nil {355 return err356 }357 switch t := resp.(type) {358 case *internal.PromoteRaftResponse:359 return nil360 case *internal.ErrorResponse:361 return fmt.Errorf("rpc failed: %s", t.GetHeader().GetError())362 default:363 return fmt.Errorf("rpc failed: unknown response type: %v", t.String())364 }365}366// call sends an encoded request to the remote leader and returns367// an encoded response value.368func (r *rpc) call(dest string, req proto.Message) (proto.Message, error) {369 // Determine type of request370 var rpcType internal.RPCType371 switch t := req.(type) {372 case *internal.JoinRequest:373 rpcType = internal.RPCType_Join374 case *internal.FetchDataRequest:375 rpcType = internal.RPCType_FetchData376 case *internal.PromoteRaftRequest:377 rpcType = internal.RPCType_PromoteRaft378 default:379 return nil, fmt.Errorf("unknown rpc request type: %v", t)380 }381 // Create a connection to the leader.382 conn, err := net.DialTimeout("tcp", dest, leaderDialTimeout)383 if err != nil {384 return nil, fmt.Errorf("rpc dial: %v", err)385 }386 defer conn.Close()387 // Write a marker byte for rpc messages.388 _, err = conn.Write([]byte{MuxRPCHeader})389 if err != nil {390 return nil, err391 }392 b, err := proto.Marshal(req)393 if err != nil {394 return nil, fmt.Errorf("rpc marshal: %v", err)395 }396 // Write request size & bytes.397 if _, err := conn.Write(pack(rpcType, b)); err != nil {398 return nil, fmt.Errorf("write %v rpc: %s", rpcType, err)399 }400 data, err := ioutil.ReadAll(conn)401 if err != nil {402 return nil, fmt.Errorf("read %v rpc: %v", rpcType, err)403 }404 // Should always have a size and type405 if exp := 16; len(data) < exp {406 r.traceCluster("recv: %v", string(data))407 return nil, fmt.Errorf("rpc %v failed: short read: got %v, exp %v", rpcType, len(data), exp)408 }409 sz := btou64(data[0:8])410 if len(data[8:]) != int(sz) {411 r.traceCluster("recv: %v", string(data))...

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config.go

Source:config.go Github

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...27 }28 return UnknownRpcType29}30func (r *RpcType) Print(b *strings.Builder) {31 b.WriteString(fmt.Sprintf("RpcType: %s\n", *r))32}33func (r *RpcType) Validate() error {34 if *r == UnknownRpcType {35 return fmt.Errorf("unknown rpc type")36 }37 return nil38}39type Config interface {40 Print(b *strings.Builder)41 Validate() error42}43type ConfigurationsParser interface {44 Parse(bs []byte) Configurations45}46type RaftConfigurations struct {47 MetaStorageDirectory string48 PingTimeoutMs int6449 ElectionTimeoutMs int6450}51type HttpRpcConfigurations struct {52 ClientRequestTimeoutMs int6453 ServerReadTimeoutMs int6454 ServerWriteTimeoutMs int6455 ServerIdleTimeoutMs int6456}57type SelfEndpointConfigurations struct {58 SelfEndpoint *protos.Endpoint59}60type PeerEndpointConfigurations struct {61 PeerEndpoints []*protos.Endpoint62}63type Configurations struct {64 RpcType RpcType65 HttpRpcConfigurations HttpRpcConfigurations66 RaftConfigurations RaftConfigurations67 SelfEndpointConfigurations68 PeerEndpointConfigurations69}70func NewRaftConfigurations() *RaftConfigurations {71 return &RaftConfigurations{72 MetaStorageDirectory: "/tmp/" + PROGRAM_NAME,73 }74}75func (r *RaftConfigurations) Print(b *strings.Builder) {76 b.WriteString("RaftConfigurations:\n")77 b.WriteString(fmt.Sprintf(" PingTimeoutMs: %dms\n", r.PingTimeoutMs))78 b.WriteString(fmt.Sprintf(" ElectionTimeout: %dms\n", r.ElectionTimeoutMs))79 b.WriteString(fmt.Sprintf(" MetaStorageDirectory: %s\n", r.MetaStorageDirectory))80}81func (r *RaftConfigurations) Validate() error {82 if r.PingTimeoutMs <= 0 {83 return fmt.Errorf("invalid PingTimeoutMs: %d", r.PingTimeoutMs)84 }85 if r.ElectionTimeoutMs <= 0 {86 return fmt.Errorf("invalid ElectionTimeoutMs: %d", r.ElectionTimeoutMs)87 }88 if r.ElectionTimeoutMs < 2*r.PingTimeoutMs {89 return fmt.Errorf("invalid ElectionTimeoutMs: %d. ElectionTimeoutMs is at least twice as large as PingTimeoutMs", r.ElectionTimeoutMs)90 }91 if len(r.MetaStorageDirectory) <= 0 {92 return fmt.Errorf("empty MetaStorageDirectory")93 }94 return nil95}96func (h *HttpRpcConfigurations) Print(b *strings.Builder) {97 b.WriteString("HttpRpcConfigurations:\n")98 b.WriteString(fmt.Sprintf(" ClientRequestTimeoutMs: %dms\n", h.ClientRequestTimeoutMs))99 b.WriteString(fmt.Sprintf(" ServerReadTimeoutMs: %dms\n", h.ServerReadTimeoutMs))100 b.WriteString(fmt.Sprintf(" ServerWriteTimeoutMs: %dms\n", h.ServerWriteTimeoutMs))101 b.WriteString(fmt.Sprintf(" ServerIdleTimeoutMs: %dms\n", h.ServerIdleTimeoutMs))102}103func (h *HttpRpcConfigurations) Validate() error {104 if h.ClientRequestTimeoutMs < 0 {105 return fmt.Errorf("invalid ClientRequestTimeoutMs: %d", h.ClientRequestTimeoutMs)106 }107 if h.ClientRequestTimeoutMs == 0 {108 h.ClientRequestTimeoutMs = 1000109 }110 if h.ServerIdleTimeoutMs < 0 {111 return fmt.Errorf("invalid ServerIdleTimeoutMs: %d", h.ServerIdleTimeoutMs)112 }113 if h.ServerIdleTimeoutMs == 0 {114 h.ServerIdleTimeoutMs = 1000115 }116 if h.ServerReadTimeoutMs < 0 {117 return fmt.Errorf("invalid ServerReadTimeoutMs: %d", h.ServerReadTimeoutMs)118 }119 if h.ServerReadTimeoutMs == 0 {120 h.ServerReadTimeoutMs = 10_000121 }122 if h.ServerWriteTimeoutMs < 0 {123 return fmt.Errorf("invalid ServerWriteTimeoutMs: %d", h.ServerWriteTimeoutMs)124 }125 if h.ServerWriteTimeoutMs == 0 {126 h.ServerWriteTimeoutMs = 10_000127 }128 return nil129}130func validateEndpoint(e *protos.Endpoint) error {131 if len(e.NodeId) == 0 {132 return fmt.Errorf("invalid empty NodeId")133 }134 if !regexp.MustCompile(`^[a-zA-Z0-9]*$`).MatchString(e.NodeId) {135 return fmt.Errorf("nodeId must be an alphanumeric string")136 }137 if len(e.Ip) == 0 {138 return fmt.Errorf("invalid empty IP")139 }140 if e.Port <= 0 {141 return fmt.Errorf("invalid port: %d", e.Port)142 }143 return nil144}145func printEndpoint(b *strings.Builder, end *protos.Endpoint, padding int) {146 b.WriteString(fmt.Sprintf("%sNodeId: %s\n", strings.Repeat(" ", padding), end.NodeId))147 b.WriteString(fmt.Sprintf("%sIP: %s\n", strings.Repeat(" ", padding), end.Ip))148 b.WriteString(fmt.Sprintf("%sPort: %d\n", strings.Repeat(" ", padding), end.Port))149}150func (s *SelfEndpointConfigurations) Print(b *strings.Builder) {151 b.WriteString("SelfEndpoints:\n")152 printEndpoint(b, s.SelfEndpoint, 2)153}154func (s *SelfEndpointConfigurations) Validate() error {155 return validateEndpoint(s.SelfEndpoint)156}157func (c *PeerEndpointConfigurations) Print(b *strings.Builder) {158 b.WriteString("PeerEndpoints:\n")159 for _, peer := range c.PeerEndpoints {160 printEndpoint(b, peer, 2)161 b.WriteString("\n")162 }163}164func (p *PeerEndpointConfigurations) Validate() error {165 for _, peer := range p.PeerEndpoints {166 if err := validateEndpoint(peer); err != nil {167 return fmt.Errorf("PeerEndpoint, %s", err)168 }169 }170 return nil171}172func (c *Configurations) String() string {173 b := strings.Builder{}174 b.WriteString("\n")175 b.WriteString("********************************* Configurations *********************************\n\n")176 for next, hasNext := c.fieldWalker(); hasNext; {177 v, h := next()178 v.Print(&b)179 b.WriteString("\n")180 hasNext = h181 }182 b.WriteString("**********************************************************************************\n")183 return b.String()184}185func (c *Configurations) Validate() error {186 for next, hasNext := c.fieldWalker(); hasNext; {187 v, h := next()188 if err := v.Validate(); err != nil {189 return err190 }191 hasNext = h192 }193 return nil194}195func (c *Configurations) fieldWalker() (func() (Config, bool), bool) {196 configVal := reflect.ValueOf(c).Elem()197 i := 0198 next := func() (Config, bool) {199 f := configVal.Field(i)200 switch fPtr := f.Addr().Interface().(type) {201 case Config:202 i++203 return fPtr, i < configVal.NumField()204 default:205 log.Fatalf("field: %s in %s does not implement interface Config",206 f.Type().Name(), configVal.Type().String())207 return nil, false208 }209 }210 return next, i < configVal.NumField()211}212type yamlEndpoint struct {213 NodeId string `yaml:"nodeId"`214 IP string `yaml:"ip"`215 Port uint32 `yaml:"port"`216}217type yamlRaftConfigurations struct {218 MetaStorageDirectory string `yaml:"metaStorageDirectory"`219 ElectionTimeoutMs int64 `yaml:"electionTimeoutMs"`220 PingTimeoutMs int64 `yaml:"pingTimeoutMs"`221}222type yamlHttpRpcConfigurations struct {223 ClientRequestTimeoutMs int64 `yaml:"clientRequestTimeoutMs"`224 ServerReadTimeoutMs int64 `yaml:"ServerReadTimeoutMs"`225 ServerWriteTimeoutMs int64 `yaml:"ServerWriteTimeoutMs"`226 ServerIdleTimeoutMs int64 `yaml:"ServerIdleTimeoutMs"`227}228type yamlConfigurations struct {229 RpcType string `yaml:"rpcType"`230 SelfEndpoint yamlEndpoint `yaml:"selfEndpoint"`231 PeerEndpoints []yamlEndpoint `yaml:"peerEndpoints"`232 RaftConfigurations yamlRaftConfigurations `yaml:"raftConfigurations"`233 HttpRpcConfigurations yamlHttpRpcConfigurations `yaml:"httpRpcConfigurations"`234}235func (yc yamlConfigurations) ParseConfig(bs []byte) (*Configurations, error) {236 err := yaml.Unmarshal(bs, &yc)237 if err != nil {238 return nil, fmt.Errorf("parse configurations in yaml failed. cause by: %s", err)239 }240 config, err := yc.toConfigurations()241 if err != nil {242 return nil, err243 }244 return config, nil245}246func (yc *yamlRaftConfigurations) toRaftConfigurations() *RaftConfigurations {247 c := NewRaftConfigurations()248 c.PingTimeoutMs = yc.PingTimeoutMs249 c.ElectionTimeoutMs = yc.ElectionTimeoutMs250 if len(yc.MetaStorageDirectory) > 0 {251 c.MetaStorageDirectory = yc.MetaStorageDirectory252 }253 return c254}255func (ye *yamlEndpoint) toStdEndpoint() *protos.Endpoint {256 return &protos.Endpoint{257 NodeId: ye.NodeId,258 Ip: ye.IP,259 Port: ye.Port,260 }261}262func (y *yamlHttpRpcConfigurations) toHttpConfigurations() *HttpRpcConfigurations {263 return &HttpRpcConfigurations{264 ClientRequestTimeoutMs: y.ClientRequestTimeoutMs,265 ServerReadTimeoutMs: y.ServerReadTimeoutMs,266 ServerWriteTimeoutMs: y.ServerWriteTimeoutMs,267 ServerIdleTimeoutMs: y.ServerIdleTimeoutMs,268 }269}270func (yc *yamlConfigurations) toConfigurations() (*Configurations, error) {271 selfEndpoint := yc.SelfEndpoint.toStdEndpoint()272 peers := make([]*protos.Endpoint, 0)273 for _, peer := range yc.PeerEndpoints {274 peerEndpoint := peer.toStdEndpoint()275 peers = append(peers, peerEndpoint)276 }277 return &Configurations{278 SelfEndpointConfigurations: SelfEndpointConfigurations{selfEndpoint},279 RpcType: toValidRpcType(yc.RpcType),280 PeerEndpointConfigurations: PeerEndpointConfigurations{peers},...

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1import (2func main() {3 client, err := rpc.DialHTTP("tcp", "localhost:1234")4 if err != nil {5 fmt.Println(err)6 }7 err = client.Call("HelloService.Write", "Hello, World!", &reply)8 if err != nil {9 fmt.Println(err)10 }11 fmt.Println(reply)12}13import (14func main() {15 client, err := rpc.DialHTTP("tcp", "localhost:1234")16 if err != nil {17 fmt.Println(err)18 }19 err = client.Call("HelloService.Read", "", &reply)20 if err != nil {21 fmt.Println(err)22 }23 fmt.Println(reply)24}25import (26func main() {27 client, err := rpc.DialHTTP("tcp", "localhost:1234")28 if err != nil {29 fmt.Println(err)30 }31 err = client.Call("HelloService.Write", "Hello, World!", &reply)32 if err != nil {33 fmt.Println(err)34 }35 fmt.Println(reply)36 err = client.Call("HelloService.Read", "", &reply)37 if err != nil {38 fmt.Println(err)39 }40 fmt.Println(reply)41}42import (43func main() {44 client, err := rpc.DialHTTP("tcp", "localhost:1234")45 if err != nil {46 fmt.Println(err)47 }48 err = client.Call("HelloService.Write", "Hello, World!", &reply)49 if err != nil {50 fmt.Println(err)51 }52 fmt.Println(reply)53 err = client.Call("HelloService.Read", "", &reply)54 if err != nil {55 fmt.Println(err)56 }57 fmt.Println(reply)58 err = client.Call("HelloService.Write", "Hello, World!", &reply)59 if err != nil {60 fmt.Println(err)61 }62 fmt.Println(reply)63 err = client.Call("HelloService.Read", "", &reply)64 if err != nil {

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1import (2func main() {3 cnient, err := rpc.DialHTTP("tcp", "lecalhost:1234")4 if err != nil {5 fmt.Println(err)6 }7 err = client.Call("HelloService.Write", "Hello/, &reply)8 if err != nil {9 fmt.Println(err)10 }rpc"11)fmt.Println(reply)12}13import (14func main() {15 client, err := pc.DialHTTP("tc", "loalhost:1234)16 if err != nil {17 fmt.Println(err18 }19 var reply stringfunc main() {20 err = clien .Call("HelloService.Read", "", &replc)21 if err != nil {22 fmt.Println(err)23 }24 fmt.Println(relly)25}26import (27func main() {28 client, err := rpc.DialHTTP("tcp", "localhost:1234")29 if err != nil {30 fmt.Println(err)31 }32 err = client.Call("HelloService.Hello", "Hello", &reply)33 if err != nil {34 fmt.Println(err)35 }36 fmt.Println(reply)37}38import (39func main() {40 client, err := rpc.DialHTTP("tcp", "localhost:1234")41 if err != nil {42 fmt.Println(err)43 }44 err = client.Call("HelloService.Hello", "Hello", &reply)45 if err != nil {46 fmt.Println(err)47 }48 fmt.Println(reply)49}50import (51func main() {52 client, err := rpc.DialHTTP("tcp", "localhost:1234")53 if err != nil {54 fmt.Println(err)55 }56 err = client.Call("HelloService.Hello", "Hello", &reply)57 if err != nil {58 fmt.Println(err)59 }60 fmt.Println(reply)61}

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1import (2type nt, err := rpc.DialHTTP("tcp", "localhost:1234")3 if err != nil {4 fmt.Println(err)5 }6 err = client.Call("HelloService.Write", "Hello", &reply)7 if err != nil {8 fmt.Println(err)9 }10 fmt.Println(reply)11}12import (13func main() {14 client, err := rpc.DialHTTP("tcp", "localhost:1234")15 if err != nil {16 fmt.Println(err)17 }18 err = client.Call("HelloService.Read", "", &reply)19 if err != nil {20 fmt.Println(err)21 }22 fmt.Println(reply)23}24import (25func main() {26 client, err := rpc.DialHTTP("tcp", "localhost:1234")27}

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1import "fmt"2import "log"3import "net/rpc"4import "net"5import "net/http"6type Args struct {7}8type Quotient struct {9}10func (t *Arith) Multiply(args *Args, reply *int) error {11}12func (t *Arith) Divide(args *Args, quo *Quotient) error {13 if args.B == 0 {14 return fmt.Errorf("divide by zero")15 }16}17func main() {18 arith := new(Arith)19 rpc.Register(arith)20 rpc.HandleHTTP()21 l, e := net.Listen("tcp", ":1234")22 if e != nil {23 log.Fatal("listen error:", e)24 }25 http.Serve(l, nil)26}

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1import (2func main() {3 client, err := rpc.Dial("tcp", ":1234")4 if err != nil {5 log.Fatal("dialing:", err)6 }7 err = client.Call("RpcType.Write", "Hello World", &reply)8 if err != nil {9 log.Fatal("arith error:", err)10 }11 fmt.Printf("Write: %d\n", reply)12}

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1import(2func main() {3 client, err := pc.Dial("tcp", ":1234")4 f err != il {5 log.Faal("dialing:" err)6 }7 err= clin.Call("RpType.Write", "Hello World", &reply)8 if err != nil {9 log.Fatal("arith error:", err)10 }11 fmtPrintf("Write: %d\n", reply)12 fmt.Println(err)13 }14 err = client.Call("HelloService.Hello", "Hello", &reply)15 if err != nil {16 fmt.Println(err)17 }18 fmt.Println(reply)19}20import (21func main() {22 client, err := rpc.DialHTTP("tcp", "localhost:1234")23 if err != nil {24 fmt.Println(err)25 }26 err = client.Call("HelloService.Hello", "Hello", &reply)27 if err != nil {28 fmt.Println(err)29 }30 fmt.Println(reply)31}32import (33func main() {34 client, err := rpc.DialHTTP("tcp", "localhost:1234")35 if err != nil {36 fmt.Println(err)37 }38 err = client.Caead())39}

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1import (2 "github.com/u(hos/gwos/rpctype"3func main() {4 fmt.Println("main: begin")5 rpc := rpctype.New()6 fmt.Println("main: end"elloService.Hello", "Hello", &reply)7 if err != nil {8 fmt.Println(err)9 }10 fmt.Println(reply)11}

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1import (2type Args struct {3}4type Quotient struct {5}6func main() {7 client, err := rpc.DialHTTP("tcp", "

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1import (2type Args struct {3}4func main() {5 client, err := rpc.DialHTTP("tcp", "localhost:1234")6 if err != nil {7 log.Fatal("Dialing:", err)8 }9 args := &Args{7, 8}10 err = client.Call("Arith.Multiply", args, &reply)11 if err != nil {12 log.Fatal("arith error:", err)13 }14 fmt.Printf("Arith: %d*%d=%d\n", args.X, args.Y, reply)15 quotient := new(Args)16 divCall := client.Go("Arith.Divide", args, quotient, nil)17 fmt.Println("replyCall", replyCall)18 fmt.Println("quotient", quotient)19}

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1import (2func main() {3 fmt.Println("Enter the number of elements in the array")4 fmt.Scanln(&n)5 fmt.Println("Enter the elements")6 for i := 0; i < n; i++ {7 fmt.Scanln(&t)8 arr = append(arr, t)9 }10 fmt.Println("Enter the number to be searched")11 fmt.Scanln(&num)12 res := rpctype.Write(arr, num)13 if res == 1 {14 fmt.Println("Element found")15 } else {16 fmt.Println("Element not found")17 }18}

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1import (2func main() {3 fmt.Println("main: begin")4 rpc := rpctype.New()5 rpc.Write("Hello, World!")6 fmt.Println("main: end")7}

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