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conn.go
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conn.go
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// conn.go - define the low-level network connection facility to rados cluster
package gorados
import (
"bytes"
"context"
"encoding/base64"
"encoding/binary"
"fmt"
"log"
"math/rand"
"net"
"sync"
"sync/atomic"
"time"
)
const (
defaultReadTimeout = 60 * time.Second
defaultWriteTimeout = 60 * time.Second
)
// radosConnStateType defines the connection state of the private prpotocol for RADOS.
type radosConnStateType uint8
const (
radosConnStateInvalid = radosConnStateType(iota)
radosConnStateConnecting
radosConnStateAuthenticating
radosConnStateOpen
radosConnStateClosed
)
var (
globalSequence uint32
MessageQueueSize int = 10
)
// radosConn stands for a low-level transport connection to the RADOS cluster. It fullfils the
// private protocol to communicate with RADOS cluster which only support TCP. It implements the
// net.Conn interface for extention.
type radosConn struct {
// conn lays on the OS network stack which only support the TCP network.
conn *net.TCPConn
ctx context.Context
canceller context.CancelFunc
dialer *net.Dialer
remoteAddr *net.TCPAddr
localAddr *net.TCPAddr
state radosConnStateType
lock *sync.Mutex
statusChan chan struct{}
sendChan chan Message
recvChan chan Message
wg sync.WaitGroup
moncmdLock *sync.Mutex
serverEntityAddr *EntityAddr
clientEntityAddr *EntityAddr
nonce uint32 // the random number generated for the current connection.
globalSeq uint32
connectSeq uint32
connectEntity uint32
outSeq uint64
outAckedSeq uint64
inSeq uint64
inAckedSeq uint64
negotiation *NegotiationType
negotiationReply *NegotiationReplyType
needSendKeepalive bool
cryptoKey *CryptoKey
clientEnt EntityName
// Store the following critical fields that got from the remote server.
keepalive Time
monmap *monmapType
globalId uint64
clientChallenge uint64
serverChallenge uint64
sessionTicket authSessionTicket
principalTickets []authSessionTicket
// ReadTimeout control the timeout span for a single read.
ReadTimeout time.Duration
// ReadTimeout control the timeout span for a single write.
WriteTimeout time.Duration
// DialTimeout is the duration for dialing which user can set in external.
// Must be set before calling connect method.
DialTimeout time.Duration
}
// NewRadosConn creates a empty connection which can act as a handle all next operations. The
// only required argument is the entity protocol version type to be connected. Use the constants
// defined in this package to specify: MON or OSD.
func NewRadosConn(ctx context.Context, entityToConnect ConnectEntity) *radosConn {
conn := &radosConn{
dialer: &net.Dialer{},
state: radosConnStateInvalid,
lock: &sync.Mutex{},
statusChan: make(chan struct{}),
sendChan: make(chan Message, MessageQueueSize),
recvChan: make(chan Message, MessageQueueSize),
moncmdLock: &sync.Mutex{},
serverEntityAddr: &EntityAddr{},
clientEntityAddr: &EntityAddr{},
connectEntity: uint32(entityToConnect),
clientEnt: EntityName{ENTITY_CLIENT, -1},
ReadTimeout: defaultReadTimeout,
WriteTimeout: defaultWriteTimeout,
}
conn.ctx, conn.canceller = context.WithCancel(ctx)
return conn
}
func (c *radosConn) Dial(network, addr string) error {
c.lock.Lock()
defer c.lock.Unlock()
if c.state != radosConnStateInvalid && c.state != radosConnStateClosed {
log.Printf("already connecting or connected to %s", addr)
return nil
}
remoteAddr, err := net.ResolveTCPAddr(network, addr)
if err != nil {
return err
}
c.remoteAddr = remoteAddr
// Set the dialer parameters before creating the connection
if c.dialer == nil {
c.dialer = &net.Dialer{}
}
if c.DialTimeout > 0 {
c.dialer.Timeout = c.DialTimeout
}
if c.localAddr != nil {
c.dialer.LocalAddr = c.localAddr
}
// Do dialing to the rados cluster
conn, err := c.dialer.DialContext(c.ctx, network, addr)
if err != nil {
return err
}
if tcp, ok := conn.(*net.TCPConn); !ok {
return fmt.Errorf("only support TCP network to rados")
} else {
c.conn = tcp
if c.localAddr == nil {
c.localAddr = tcp.LocalAddr().(*net.TCPAddr)
}
}
log.Printf("dial to server %s success", remoteAddr)
c.conn.SetLinger(0) // discards remaining data when close the connection
c.conn.SetNoDelay(true)
c.conn.SetKeepAlive(true)
c.conn.SetKeepAlivePeriod(10 * time.Second)
c.state = radosConnStateConnecting
return nil
}
// Connect implements the private handshake protocol to RADOS cluster.
func (c *radosConn) Connect(keyring string) (err error) {
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("panic error: %v", r)
}
if err != nil { // close the connection if error occurs
c.Close()
}
}()
if c.state != radosConnStateConnecting {
return fmt.Errorf("connection state is invalid")
}
keyBytes, err := base64.StdEncoding.DecodeString(keyring)
if err != nil {
return err
}
c.cryptoKey = &CryptoKey{}
if err = c.cryptoKey.UnmarshalBinary(keyBytes); err != nil {
return err
}
serverHandshakeSize := BANNER_SIZE + c.serverEntityAddr.Size() + c.clientEntityAddr.Size()
serverHandshake := make([]byte, serverHandshakeSize)
n, err := c.Read(serverHandshake)
if err != nil {
return err
}
if n != len(serverHandshake) {
return fmt.Errorf("invalid server handshake")
}
log.Printf("read server handshake success, size=%d", n)
// Check banner
if !bytes.Equal(serverHandshake[0:BANNER_SIZE], []byte(BANNER_STR)) {
err = fmt.Errorf("server banner not match: %s", string(serverHandshake[0:BANNER_SIZE]))
return err
}
serverHandshake = serverHandshake[BANNER_SIZE:]
log.Printf("check server handshake banner matched")
// Parse server and peer identity
if err = c.serverEntityAddr.UnmarshalBinary(serverHandshake); err != nil {
return err
}
serverHandshake = serverHandshake[c.serverEntityAddr.Size():]
serverClientAddr := &EntityAddr{}
if err = serverClientAddr.UnmarshalBinary(serverHandshake); err != nil {
return err
}
log.Printf("parse identity: server=%+v client=%+v", c.serverEntityAddr, serverClientAddr)
// Send client handshake
c.clientEntityAddr.Type = 0 // always use the default socket address type
if c.nonce == 0 {
c.setNonce()
}
c.clientEntityAddr.Nonce = c.nonce
local := c.localAddr
if local.IP.To4() != nil { // use IPv4 address
c.clientEntityAddr.Address = NewSockAddr(local.IP, local.Port)
} else { // use IPv6 address
c.clientEntityAddr.Address = NewSockAddr6(local.IP, local.Port)
}
var b bytes.Buffer
if _, err = b.Write([]byte(BANNER_STR)); err != nil {
return err
}
client, err := c.clientEntityAddr.MarshalBinary()
if err != nil {
return err
}
if _, err = b.Write(client); err != nil {
return err
}
if _, err = c.Write(b.Bytes()); err != nil {
return err
}
log.Printf("send client handshake success: %+v, size=%d", c.clientEntityAddr, b.Len())
c.globalSeq = atomic.AddUint32(&globalSequence, 1)
for {
// Client send negotiation message to server.
c.negotiation = &NegotiationType{
Features: DEFAULT_FEATURES,
HostType: uint32(ENTITY_CLIENT),
GlobalSequence: c.globalSeq,
ConnectSequence: c.connectSeq,
ProtoVersion: c.connectEntity,
Flag: DEFAULT_FLAGS,
}
data, err := c.negotiation.MarshalBinary()
if err != nil {
return err
}
if _, err = c.Write(data); err != nil {
return err
}
log.Printf("send client negotiation success: %+v, size=%d", c.negotiation, len(data))
// Check negotiation reply message from server.
c.negotiationReply = &NegotiationReplyType{}
buf := make([]byte, c.negotiationReply.Size())
if _, err = c.Read(buf); err != nil {
return err
}
if err = c.negotiationReply.UnmarshalBinary(buf); err != nil {
return err
}
log.Printf("recv server negotiation reply success: %+v", c.negotiationReply)
log.Printf("got reply tag: %d", c.negotiationReply.Tag)
switch c.negotiationReply.Tag {
case MSG_TAG_FEATURES:
err = fmt.Errorf("protocol feature mismatch")
return err
case MSG_TAG_BADPROTOVER:
err = fmt.Errorf("protocol version mismatch")
return err
case MSG_TAG_BADAUTHORIZER:
err = fmt.Errorf("got BADAUTHORIZER tag")
return err
case MSG_TAG_RESETSESSION:
c.connectSeq = 0
log.Printf("got RESETSESSION tag, set connect sequence 0")
continue
case MSG_TAG_RETRY_GLOBAL:
if c.negotiationReply.GlobalSequence > c.globalSeq {
c.globalSeq = c.negotiationReply.GlobalSequence
}
c.globalSeq += 1
log.Printf("got RETRY_GLOBAL tag, current=%d, new=%d",
c.negotiation.GlobalSequence, c.globalSeq)
continue
case MSG_TAG_RETRY_SESSION:
log.Printf("got RETRY_SESSION, local seq=%d, remote seq=%d",
c.globalSeq, c.negotiation.GlobalSequence)
c.connectSeq = c.negotiationReply.ConnectSequence
continue
case MSG_TAG_WAIT:
err = fmt.Errorf("got WAIT tag")
return err
case MSG_TAG_SEQ, MSG_TAG_READY:
log.Printf("server features: 0x%x", c.negotiationReply.Features)
if c.negotiationReply.Tag == MSG_TAG_SEQ {
ackSeqBuf := make([]byte, 8)
if _, err = c.Read(ackSeqBuf); err != nil {
return err
}
var newAckSeq uint64
binary.Read(bytes.NewBuffer(ackSeqBuf), binary.LittleEndian, &newAckSeq)
log.Printf("got new ack seq: %d", newAckSeq)
b.Reset()
binary.Write(&b, binary.LittleEndian, c.inSeq)
if _, err = c.Write(b.Bytes()); err != nil {
return err
}
log.Printf("write in seq: %d", newAckSeq)
}
c.connectSeq += 1
if c.negotiationReply.ConnectSequence != c.connectSeq {
panic("connect sequence not match")
}
}
break
}
c.lock.Lock()
c.state = radosConnStateAuthenticating
c.lock.Unlock()
c.wg.Add(2)
log.Print("start writer to process data from local side")
go c.writer()
log.Print("start reader to process data from remote side")
go c.reader()
return c.authenticate()
}
// MonCommand send the command to the RADOS monitor.
func (c *radosConn) MonCommand(cmd []byte) (result []byte, err error) {
c.moncmdLock.Lock()
defer c.moncmdLock.Unlock()
msgCmd := NewMessageMonCommand(c.monmap.FSID)
msgCmd.AddCmd(cmd)
if err = msgCmd.Encode(); err != nil {
log.Printf("encode mon command message failed: %v", err)
return
}
msgCmd.CreateHeader(c.clientEnt, c.getOutSeq(), 0, MSG_PRIO_DEFAULT, 1, 0)
msgCmd.CreateFooter(MSG_FOOTER_FLAG_LOSSY, 0)
if err = c.sendMessage(msgCmd); err != nil {
log.Printf("send auth message failed: %v", err)
return
}
// Receive the command return message and check the return code.
var msgCmdReply *MessageMonCommand
for {
reply, err := c.recvMessage()
if err != nil {
return nil, err
}
if realMsg, ok := reply.(*MessageMonCommand); !ok {
c.recvChan <- reply
continue
} else {
msgCmdReply = realMsg
break
}
}
if msgCmdReply.RetCode != 0 {
return nil, fmt.Errorf("mon command return error: code=%d, msg=%s",
msgCmdReply.RetCode, string(msgCmdReply.ResultMsg))
}
return msgCmdReply.Data, nil
}
// authenticate perform the private authority facility with the given keyring.
func (c *radosConn) authenticate() error {
var (
ver uint16 = 1
transId uint64
dataOff uint16
signature uint64
)
log.Print("start authenticating...")
// Create the first authenticate message and send to remote server.
msgAuth, err := NewMessageAuth(AUTH_USER)
if err != nil {
log.Printf("create auth message failed: %v", err)
return err
}
if err = msgAuth.Encode(); err != nil {
log.Printf("encode auth message failed: %v", err)
return err
}
msgAuth.CreateHeader(c.clientEnt, c.getOutSeq(), transId, MSG_PRIO_DEFAULT, ver, dataOff)
msgAuth.CreateFooter(MSG_FOOTER_FLAG_LOSSY, signature)
if err := c.sendMessage(msgAuth); err != nil {
log.Printf("send auth message failed: %v", err)
return err
}
log.Printf("send auth message: seq=%d", msgAuth.Header.Seq)
// Receive the message from remote server: either auth reply message or monmap message.
gotMonmap, sentGetSessionKey, sentGetPrincipalKey, finished := false, false, false, false
for {
msg, err := c.recvMessage()
if err != nil {
return err
}
switch m := msg.(type) {
case *MessageAuthReply:
switch {
case !sentGetSessionKey && !sentGetPrincipalKey: // first auth reply
serverChallenge, err := m.GetServerChallenge()
if err != nil {
log.Printf("invalid server challenge: %v", err)
return err
}
log.Printf("server auth challenge: 0x%x", serverChallenge)
c.serverChallenge = serverChallenge
c.globalId = m.GlobalId
// Try to send get-auth-session-key message.
log.Printf("sending get-auth-session-key message ...")
sk, err := NewMessageAuthSessionKey(
m.Protocol, c.serverChallenge, c.clientChallenge, c.cryptoKey)
if err != nil {
log.Printf("create get-auth-session-key message failed: %v", err)
return err
}
if err = sk.Encode(); err != nil {
log.Printf("encode get-auth-session-key message failed: %v", err)
return err
}
sk.CreateHeader(c.clientEnt, c.getOutSeq(), transId, MSG_PRIO_DEFAULT, ver, dataOff)
sk.CreateFooter(MSG_FOOTER_FLAG_LOSSY, signature)
if err := c.sendMessage(sk); err != nil {
log.Printf("send get auth session key message failed: %+v", err)
return err
}
sentGetSessionKey = true
case sentGetSessionKey && !sentGetPrincipalKey: // get session key reply
tickets, err := m.GetSessionTickets(c.cryptoKey)
if err != nil || len(tickets) == 0 {
log.Printf("get session key reply failed: %+v", err)
return err
}
c.sessionTicket = tickets[0]
tpl := "get session key success, use first one\n serviceId=%d "
tpl += "validity=%d encrypted=%v secretId=%d\n sessionKey=%+v"
log.Printf(tpl, c.sessionTicket.ServiceId, c.sessionTicket.Validity,
c.sessionTicket.Encrypted, c.sessionTicket.SecretId, c.sessionTicket.SessionKey)
// Try to send PrincipalKey auth message
log.Printf("sending get-principal-key message ...")
pk, err := NewMessageAuthPrincipalKey(m.Protocol, c.globalId, &c.sessionTicket)
if err != nil {
log.Printf("create get-auth-principal-session-key message failed: %v", err)
return err
}
if err = pk.Encode(); err != nil {
log.Printf("encode get-auth-principal-session-key message failed: %v", err)
return err
}
pk.CreateHeader(c.clientEnt, c.getOutSeq(), transId, MSG_PRIO_DEFAULT, ver, dataOff)
pk.CreateFooter(MSG_FOOTER_FLAG_LOSSY, signature)
if err := c.sendMessage(pk); err != nil {
log.Printf("send get-auth-principal-session-key message failed: %v", err)
return err
}
sentGetPrincipalKey = true
case sentGetSessionKey && sentGetPrincipalKey: // get principal key reply
tickets, err := m.GetSessionTickets(&c.sessionTicket.SessionKey)
if err != nil {
log.Printf("get auth principal session key failed: %v", err)
return err
}
c.principalTickets = tickets
tpl := "\n serviceId=%d validity=%d secretId=%d\n sessionKey=%+v"
for i := range tickets {
log.Printf(tpl, tickets[i].ServiceId, tickets[i].Validity,
tickets[i].SecretId, tickets[i].SessionKey)
}
finished = true
case !sentGetSessionKey && sentGetPrincipalKey: // invalid state
err = fmt.Errorf("exchange key failed when doing authenticate")
log.Print(err)
return err
}
case *MessageMonmap:
log.Printf("got monmap : epoch=%d, size=%d, count=%d", m.Epoch, m.Size, len(m.Mons))
c.monmap = &m.monmapType
gotMonmap = true
default:
err = fmt.Errorf("got invalid message when doing authenticate: %v", msg)
log.Print(err)
return err
}
if gotMonmap && sentGetSessionKey && sentGetPrincipalKey && finished {
log.Printf("authenticate success: monmap=%+v", c.monmap)
break
}
}
c.lock.Lock()
c.state = radosConnStateOpen
c.lock.Unlock()
return nil
}
func (c *radosConn) Subscribe(name string) error {
msgSub := NewMessageMonSubscribe(shortHostname())
msgSub.Add(name, &subscribeItem{})
if err := msgSub.Encode(); err != nil {
log.Printf("encode %s message failed: %v", msgSub.Name(), err)
return err
}
msgSub.CreateHeader(c.clientEnt, c.getOutSeq(), 0, MSG_PRIO_DEFAULT, 3, 0)
msgSub.CreateFooter(MSG_FOOTER_FLAG_LOSSY, 0)
if err := c.sendMessage(msgSub); err != nil {
log.Printf("send %s message failed: %v", msgSub.Name(), err)
return err
}
// Receive the return message and check the return code.
for {
reply, err := c.recvMessage()
if err != nil {
return err
}
switch realMsg := reply.(type) {
case *MessageMonmap:
*c.monmap = realMsg.monmapType
log.Printf("subscribe monmap success: %+v", realMsg.monmapType)
default:
c.recvChan <- reply
continue
}
break
}
return nil
}
func (c *radosConn) reader() {
c.lock.Lock()
defer func() {
c.lock.Unlock()
log.Printf("reader exit")
c.wg.Done()
c.canceller() // cancel the writer explicitly.
}()
tagBuf := make([]byte, 1)
for c.state != radosConnStateInvalid && c.state != radosConnStateClosed {
select {
case <-c.ctx.Done():
return
default: // Procss reading data from remote side.
c.lock.Unlock()
if _, err := c.Read(tagBuf); err != nil {
log.Printf("reader read tag failed: %v", err)
c.lock.Lock()
c.state = radosConnStateClosed
continue
}
log.Printf("reader got tag: %d", tagBuf[0])
switch tagBuf[0] {
case MSG_TAG_ACK:
log.Print("reader got ACK tag")
acked := make([]byte, 8)
if _, err := c.Read(acked); err != nil {
log.Printf("reader get ack seq failed: %v", err)
c.lock.Lock()
c.state = radosConnStateClosed
break
}
c.lock.Lock()
binary.Read(bytes.NewReader(acked), binary.LittleEndian, &c.outAckedSeq)
log.Printf("get out acked seq: %d, current out seq: %d", c.outAckedSeq, c.outSeq)
case MSG_TAG_KEEPALIVE2, MSG_TAG_KEEPALIVE2_ACK:
log.Print("reader got KEEPALIVE tag")
c.lock.Lock()
if err := c.recvKeepAlive(); err != nil {
log.Printf("reader send keepalive failed: %v", err)
c.state = radosConnStateClosed
break
}
c.needSendKeepalive = true
c.statusChan <- struct{}{}
case MSG_TAG_MSG:
log.Print("reader got MSG tag")
c.lock.Lock()
msg, err := c.readMessage()
if err != nil {
log.Printf("reader read msg failed: %v", err)
continue
}
log.Printf("reader read message #%d success", msg.Sequence())
c.inSeq = msg.Sequence()
c.statusChan <- struct{}{}
c.recvChan <- msg
case MSG_TAG_CLOSE:
log.Print("reader got CLOSE tag")
c.lock.Lock()
c.state = radosConnStateClosed
break
default:
log.Print("reader got bad tag to close the connection")
c.lock.Lock()
c.state = radosConnStateClosed
break
}
}
}
}
func (c *radosConn) writer() {
defer func() {
log.Printf("writer exit")
c.wg.Done()
}()
for c.state != radosConnStateInvalid && c.state != radosConnStateClosed {
log.Printf("writer begin processing: state=%d", c.state)
if c.state == radosConnStateConnecting {
return
}
select {
case <-c.ctx.Done():
return
case <-c.statusChan:
if c.needSendKeepalive {
if err := c.sendKeepAlive(); err != nil {
log.Printf("writer do keepalive failed: %v", err)
}
c.needSendKeepalive = false
}
if c.inSeq > c.inAckedSeq {
if err := c.writeAck(); err != nil {
log.Printf("writer write ack %d failed: %v", c.inSeq, err)
continue
}
c.inAckedSeq = c.inSeq
}
case msg, ok := <-c.sendChan: // try to get a message and do sending.
if !ok {
break
}
data, err := msg.MarshalBinary()
if err != nil {
log.Printf("writer marshal message failed: %v", err)
continue
}
data = append(data, byte(MSG_TAG_MSG))
copy(data[1:], data)
data[0] = byte(MSG_TAG_MSG)
if _, err := c.Write(data); err != nil {
log.Printf("writer send message failed: %v", err)
continue
}
log.Printf("send message success seq=%d", msg.Sequence())
}
}
}
func (c *radosConn) sendMessage(msg Message) error {
ctx, _ := context.WithTimeout(c.ctx, time.Second * 10)
select {
case <-ctx.Done():
return ctx.Err()
case c.sendChan <- msg:
return nil
}
}
func (c *radosConn) recvMessage() (Message, error) {
ctx, _ := context.WithTimeout(c.ctx, time.Second * 10)
select {
case <-ctx.Done():
return nil, ctx.Err()
case msg := <-c.recvChan:
return msg, nil
}
}
func (c *radosConn) readMessage() (Message, error) {
// Create a dummpy message object to decode the header.
msg := &message{}
header := make([]byte, msg.HeaderSize())
if _, err := c.Read(header); err != nil {
return nil, err
}
if err := msg.DecodeHeader(header); err != nil {
return nil, err
}
// Create the actual message object by type and set header by decoding.
// Just care about the following messages, and message with new type can be added here to
// extend the functionality.
var m Message
switch msg.Header.Type {
case MSG_AUTH:
m = &MessageAuth{}
case MSG_AUTH_REPLY:
m = &MessageAuthReply{}
case MSG_MON_MAP:
m = &MessageMonmap{}
case MSG_MON_COMMAND_ACK:
m = &MessageMonCommand{}
case MSG_CONFIG:
m = &MessageMonSubscribe{}
default:
return nil, fmt.Errorf("unrecognized message type: header=%+v", msg.Header)
}
m.DecodeHeader(header) // checked before, just ignore the error returned.
// Read and parse the payload, middle and data parts.
var got uint32 = 0
size := msg.Header.FrontLen + msg.Header.MiddleLen + msg.Header.DataLen
buffer := make([]byte, size)
if msg.Header.FrontLen > 0 {
if _, err := c.Read(buffer[got:msg.Header.FrontLen]); err != nil {
return nil, err
}
got += msg.Header.FrontLen
}
if msg.Header.MiddleLen > 0 {
if _, err := c.Read(buffer[got : got+msg.Header.MiddleLen]); err != nil {
return nil, err
}
got += msg.Header.MiddleLen
}
if msg.Header.DataLen > 0 {
if _, err := c.Read(buffer[got : got+msg.Header.DataLen]); err != nil {
return nil, err
}
got += msg.Header.DataLen
}
if _, err := m.Decode(buffer); err != nil {
return nil, err
}
// Read message footer and decode.
footer := make([]byte, msg.FooterSize())
if _, err := c.Read(footer); err != nil {
return nil, err
}
if err := m.DecodeFooter(footer); err != nil {
return nil, err
}
return m, nil
}
// Send the current timestamp to remote server.
func (c *radosConn) sendKeepAlive() error {
var b bytes.Buffer
if _, err := b.Write([]byte{byte(MSG_TAG_KEEPALIVE2)}); err != nil {
return err
}
ts := time.Now().UnixNano()
sec := uint32(ts / 1000000000)
nano := uint32(ts % 1000000000)
if err := binary.Write(&b, binary.LittleEndian, sec); err != nil {
return err
}
if err := binary.Write(&b, binary.LittleEndian, nano); err != nil {
return err
}
if _, err := c.Write(b.Bytes()); err != nil {
return err
}
return nil
}
// Read the remote server keepalive timestamp.
func (c *radosConn) recvKeepAlive() error {
buf := make([]byte, 8)
if _, err := c.Read(buf); err != nil {
return err
}
r := bytes.NewReader(buf)
if err := binary.Read(r, binary.LittleEndian, &c.keepalive.Second); err != nil {
return err
}
if err := binary.Read(r, binary.LittleEndian, &c.keepalive.Nano); err != nil {
return err
}
log.Printf("receive remote keep alive ack: %d.%d", c.keepalive.Second, c.keepalive.Nano)
return nil
}
func (c *radosConn) writeAck() error {
var b bytes.Buffer
if err := binary.Write(&b, binary.LittleEndian, uint8(MSG_TAG_ACK)); err != nil {
return err
}
if err := binary.Write(&b, binary.LittleEndian, c.inSeq); err != nil {
return err
}
if _, err := c.Write(b.Bytes()); err != nil {
return err
}
return nil
}
// setNonce generates a random number for current connection.
func (c *radosConn) setNonce() { c.nonce = rand.Uint32() }
func (c *radosConn) getOutSeq() uint64 {
return atomic.AddUint64(&c.outSeq, 1)
}
// SetLocalAddr sets the local address before connect to the rados cluster.
func (c *radosConn) SetLocalAddr(network, addr string) error {
tcp, err := net.ResolveTCPAddr(network, addr)
if err != nil {
return err
}
c.localAddr = tcp
return nil
}
/// Following methods implement the net.Conn interface.
func (c *radosConn) Close() error {
c.lock.Lock()
c.state = radosConnStateClosed
err := c.conn.Close()
c.lock.Unlock()
c.wg.Wait()
return err
}
func (c *radosConn) Read(b []byte) (n int, err error) {
c.conn.SetReadDeadline(time.Now().Add(c.ReadTimeout))
n, err = c.conn.Read(b)
return n, err
}
func (c *radosConn) Write(b []byte) (n int, err error) {
c.conn.SetWriteDeadline(time.Now().Add(c.WriteTimeout))
n, err = c.conn.Write(b)
return n, err
}
func (c *radosConn) LocalAddr() net.Addr { return c.conn.LocalAddr() }
func (c *radosConn) RemoteAddr() net.Addr { return c.conn.RemoteAddr() }
func (c *radosConn) SetDeadline(t time.Time) error { return c.conn.SetDeadline(t) }
func (c *radosConn) SetReadDeadline(t time.Time) error { return c.conn.SetReadDeadline(t) }
func (c *radosConn) SetWriteDeadline(t time.Time) error { return c.conn.SetWriteDeadline(t) }