How to use Call method of rpctype Package

Best Syzkaller code snippet using rpctype.Call

rpc.go

Source:rpc.go

1package meta2import (3	"encoding/binary"4	"errors"5	"fmt"6	"io"7	"io/ioutil"8	"log"9	"net"10	"time"11	"github.com/gogo/protobuf/proto"12	"github.com/hashicorp/raft"13	"github.com/influxdb/influxdb/meta/internal"14)15// Max size of a message before we treat the size as invalid16const (17	MaxMessageSize    = 1024 * 1024 * 102418	leaderDialTimeout = 10 * time.Second19)20// rpc handles request/response style messaging between cluster nodes21type rpc struct {22	logger         *log.Logger23	tracingEnabled bool24	store interface {25		cachedData() *Data26		enableLocalRaft() error27		IsLeader() bool28		Leader() string29		Peers() ([]string, error)30		SetPeers(addrs []string) error31		AddPeer(host string) error32		CreateNode(host string) (*NodeInfo, error)33		NodeByHost(host string) (*NodeInfo, error)34		WaitForDataChanged() error35	}36}37// JoinResult defines the join result structure.38type JoinResult struct {39	RaftEnabled bool40	RaftNodes   []string41	NodeID      uint6442}43// Reply defines the interface for Reply objects.44type Reply interface {45	GetHeader() *internal.ResponseHeader46}47// proxyLeader proxies the connection to the current raft leader48func (r *rpc) proxyLeader(conn *net.TCPConn, buf []byte) {49	if r.store.Leader() == "" {50		r.sendError(conn, "no leader detected during proxyLeader")51		return52	}53	leaderConn, err := net.DialTimeout("tcp", r.store.Leader(), leaderDialTimeout)54	if err != nil {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))412		return nil, fmt.Errorf("rpc %v failed: short read: got %v, exp %v", rpcType, len(data[8:]), sz)413	}414	// See what response type we got back, could get a general error response415	rpcType = internal.RPCType(btou64(data[8:16]))416	data = data[16:]417	var resp proto.Message418	switch rpcType {419	case internal.RPCType_Join:420		resp = &internal.JoinResponse{}421	case internal.RPCType_FetchData:422		resp = &internal.FetchDataResponse{}423	case internal.RPCType_Error:424		resp = &internal.ErrorResponse{}425	case internal.RPCType_PromoteRaft:426		resp = &internal.PromoteRaftResponse{}427	default:428		return nil, fmt.Errorf("unknown rpc response type: %v", rpcType)429	}430	if err := proto.Unmarshal(data, resp); err != nil {431		return nil, fmt.Errorf("rpc unmarshal: %v", err)432	}433	if reply, ok := resp.(Reply); ok {434		if !reply.GetHeader().GetOK() {435			return nil, fmt.Errorf("rpc %v failed: %s", rpcType, reply.GetHeader().GetError())436		}437	}438	return resp, nil439}440func (r *rpc) traceCluster(msg string, args ...interface{}) {441	if r.tracingEnabled {442		r.logger.Printf("rpc: "+msg, args...)443	}444}445func u64tob(v uint64) []byte {446	b := make([]byte, 8)447	binary.BigEndian.PutUint64(b, v)448	return b449}450func btou64(b []byte) uint64 {451	return binary.BigEndian.Uint64(b)452}453func contains(s []string, e string) bool {454	for _, a := range s {455		if a == e {456			return true457		}458	}459	return false460}...

Call

Using AI Code Generation

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

Call

Using AI Code Generation

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.Hello", "World", &reply)8    if err != nil {9        fmt.Println(err)10    }11    fmt.Println(reply)12}

Call

Using AI Code Generation

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{17, 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=%d15}16import (17type Args struct {18}19func (t *Arith) Multiply(args *Args, reply *int) error {20}21func main() {22	arith := new(Arith)23	rpc.Register(arith)24	rpc.HandleHTTP()25	l, e := net.Listen("tcp", ":1234")26	if e != nil {27		log.Fatal("listen error:", e)28	}29	http.Serve(l, nil)30}312017/03/02 20:00:37 rpc.Register: method "Arith.Multiply" has 1 input parameters; needs exactly three32import (33type Args struct {34}35func (t *Arith) Multiply(args *Args, reply *int) error {36}37func main() {38	arith := new(Arith)39	rpc.Register(arith)40	rpc.HandleHTTP()41	l, e := net.Listen("tcp", ":1234")42	if e != nil {43		log.Fatal("listen error:", e)44	}45	http.Serve(l, nil)46}47import (

Call

Using AI Code Generation

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

Call

Using AI Code Generation

1import (2type Args struct {3}4type Quotient struct {5}6func main() {

Call

Using AI Code Generation

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

Call

Using AI Code Generation

1import (2type Args struct {3}4func main() {5	client, err := rpc.DialHTTP("tcp", "localhost:1234")6	if err != nil {7		fmt.Println(err)8	}9	args := Args{7, 8}10	err = client.Call("Arith.Multiply", args, &reply)11	if err != nil {12		fmt.Println(err)13	}14	fmt.Printf("Arith: %d*%d=%d", args.A, args.B, reply)15}16import (17type Args struct {18}19type Quotient struct {20}21func (t *Arith) Multiply(args *Args, reply *int) error {22}23func (t *Arith) Divide(args *Args, quo *Quotient) error {24	if args.B == 0 {25		return fmt.Errorf("divide by zero")26	}27}28func main() {29	arith := new(Arith)30	rpc.Register(arith)31	tcpAddr, err := net.ResolveTCPAddr("tcp", ":1234")32	if err != nil {33		fmt.Println(err)34	}35	listener, err := net.ListenTCP("tcp", tcpAddr)36	if err != nil {37		fmt.Println(err)38	}39	for {40		conn, err := listener.Accept()41		if err != nil {42		}43		go jsonrpc.ServeConn(conn)44	}45}

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