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788 lines
19 KiB
788 lines
19 KiB
package zk
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/*
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TODO:
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* make sure a ping response comes back in a reasonable time
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Possible watcher events:
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* Event{Type: EventNotWatching, State: StateDisconnected, Path: path, Err: err}
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*/
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import (
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"crypto/rand"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"log"
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"net"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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)
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var ErrNoServer = errors.New("zk: could not connect to a server")
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const (
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bufferSize = 10 * 1024 * 1024
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eventChanSize = 6
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sendChanSize = 16
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protectedPrefix = "_c_"
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)
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type watchType int
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const (
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watchTypeData = iota
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watchTypeExist = iota
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watchTypeChild = iota
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)
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type watchPathType struct {
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path string
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wType watchType
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}
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type Dialer func(network, address string, timeout time.Duration) (net.Conn, error)
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type Conn struct {
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lastZxid int64
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sessionID int64
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state State // must be 32-bit aligned
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xid int32
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timeout int32 // session timeout in seconds
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passwd []byte
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dialer Dialer
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servers []string
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serverIndex int
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conn net.Conn
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eventChan chan Event
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shouldQuit chan bool
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pingInterval time.Duration
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recvTimeout time.Duration
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connectTimeout time.Duration
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sendChan chan *request
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requests map[int32]*request // Xid -> pending request
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requestsLock sync.Mutex
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watchers map[watchPathType][]chan Event
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watchersLock sync.Mutex
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// Debug (used by unit tests)
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reconnectDelay time.Duration
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}
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type request struct {
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xid int32
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opcode int32
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pkt interface{}
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recvStruct interface{}
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recvChan chan response
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// Because sending and receiving happen in separate go routines, there's
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// a possible race condition when creating watches from outside the read
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// loop. We must ensure that a watcher gets added to the list synchronously
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// with the response from the server on any request that creates a watch.
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// In order to not hard code the watch logic for each opcode in the recv
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// loop the caller can use recvFunc to insert some synchronously code
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// after a response.
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recvFunc func(*request, *responseHeader, error)
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}
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type response struct {
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zxid int64
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err error
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}
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type Event struct {
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Type EventType
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State State
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Path string // For non-session events, the path of the watched node.
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Err error
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}
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func Connect(servers []string, recvTimeout time.Duration) (*Conn, <-chan Event, error) {
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return ConnectWithDialer(servers, recvTimeout, nil)
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}
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func ConnectWithDialer(servers []string, recvTimeout time.Duration, dialer Dialer) (*Conn, <-chan Event, error) {
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// Randomize the order of the servers to avoid creating hotspots
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stringShuffle(servers)
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for i, addr := range servers {
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if !strings.Contains(addr, ":") {
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servers[i] = addr + ":" + strconv.Itoa(DefaultPort)
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}
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}
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ec := make(chan Event, eventChanSize)
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if dialer == nil {
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dialer = net.DialTimeout
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}
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conn := Conn{
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dialer: dialer,
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servers: servers,
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serverIndex: 0,
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conn: nil,
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state: StateDisconnected,
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eventChan: ec,
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shouldQuit: make(chan bool),
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recvTimeout: recvTimeout,
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pingInterval: time.Duration((int64(recvTimeout) / 2)),
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connectTimeout: 1 * time.Second,
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sendChan: make(chan *request, sendChanSize),
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requests: make(map[int32]*request),
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watchers: make(map[watchPathType][]chan Event),
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passwd: emptyPassword,
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timeout: 30000,
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// Debug
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reconnectDelay: time.Second,
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}
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go func() {
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conn.loop()
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conn.flushRequests(ErrClosing)
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conn.invalidateWatches(ErrClosing)
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close(conn.eventChan)
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}()
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return &conn, ec, nil
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}
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func (c *Conn) Close() {
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close(c.shouldQuit)
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select {
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case <-c.queueRequest(opClose, &closeRequest{}, &closeResponse{}, nil):
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case <-time.After(time.Second):
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}
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}
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func (c *Conn) State() State {
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return State(atomic.LoadInt32((*int32)(&c.state)))
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}
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func (c *Conn) setState(state State) {
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atomic.StoreInt32((*int32)(&c.state), int32(state))
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select {
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case c.eventChan <- Event{Type: EventSession, State: state}:
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default:
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// panic("zk: event channel full - it must be monitored and never allowed to be full")
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}
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}
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func (c *Conn) connect() {
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c.serverIndex = (c.serverIndex + 1) % len(c.servers)
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startIndex := c.serverIndex
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c.setState(StateConnecting)
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for {
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zkConn, err := c.dialer("tcp", c.servers[c.serverIndex], c.connectTimeout)
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if err == nil {
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c.conn = zkConn
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c.setState(StateConnected)
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return
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}
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log.Printf("Failed to connect to %s: %+v", c.servers[c.serverIndex], err)
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c.serverIndex = (c.serverIndex + 1) % len(c.servers)
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if c.serverIndex == startIndex {
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c.flushUnsentRequests(ErrNoServer)
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time.Sleep(time.Second)
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}
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}
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}
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func (c *Conn) loop() {
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for {
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c.connect()
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err := c.authenticate()
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switch {
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case err == ErrSessionExpired:
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c.invalidateWatches(err)
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case err != nil && c.conn != nil:
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c.conn.Close()
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case err == nil:
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closeChan := make(chan bool) // channel to tell send loop stop
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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c.sendLoop(c.conn, closeChan)
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c.conn.Close() // causes recv loop to EOF/exit
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wg.Done()
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}()
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wg.Add(1)
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go func() {
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err = c.recvLoop(c.conn)
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if err == nil {
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panic("zk: recvLoop should never return nil error")
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}
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close(closeChan) // tell send loop to exit
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wg.Done()
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}()
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wg.Wait()
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}
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c.setState(StateDisconnected)
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// Yeesh
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if err != io.EOF && err != ErrSessionExpired && !strings.Contains(err.Error(), "use of closed network connection") {
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log.Println(err)
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}
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select {
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case <-c.shouldQuit:
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c.flushRequests(ErrClosing)
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return
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default:
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}
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if err != ErrSessionExpired {
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err = ErrConnectionClosed
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}
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c.flushRequests(err)
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if c.reconnectDelay > 0 {
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select {
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case <-c.shouldQuit:
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return
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case <-time.After(c.reconnectDelay):
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}
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}
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}
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}
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func (c *Conn) flushUnsentRequests(err error) {
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for {
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select {
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default:
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return
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case req := <-c.sendChan:
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req.recvChan <- response{-1, err}
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}
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}
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}
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// Send error to all pending requests and clear request map
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func (c *Conn) flushRequests(err error) {
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c.requestsLock.Lock()
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for _, req := range c.requests {
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req.recvChan <- response{-1, err}
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}
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c.requests = make(map[int32]*request)
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c.requestsLock.Unlock()
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}
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// Send error to all watchers and clear watchers map
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func (c *Conn) invalidateWatches(err error) {
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c.watchersLock.Lock()
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defer c.watchersLock.Unlock()
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if len(c.watchers) >= 0 {
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for pathType, watchers := range c.watchers {
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ev := Event{Type: EventNotWatching, State: StateDisconnected, Path: pathType.path, Err: err}
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for _, ch := range watchers {
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ch <- ev
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close(ch)
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}
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}
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c.watchers = make(map[watchPathType][]chan Event)
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}
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}
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func (c *Conn) sendSetWatches() {
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c.watchersLock.Lock()
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defer c.watchersLock.Unlock()
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if len(c.watchers) == 0 {
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return
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}
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req := &setWatchesRequest{
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RelativeZxid: c.lastZxid,
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DataWatches: make([]string, 0),
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ExistWatches: make([]string, 0),
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ChildWatches: make([]string, 0),
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}
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n := 0
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for pathType, watchers := range c.watchers {
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if len(watchers) == 0 {
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continue
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}
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switch pathType.wType {
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case watchTypeData:
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req.DataWatches = append(req.DataWatches, pathType.path)
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case watchTypeExist:
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req.ExistWatches = append(req.ExistWatches, pathType.path)
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case watchTypeChild:
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req.ChildWatches = append(req.ChildWatches, pathType.path)
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}
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n++
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}
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if n == 0 {
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return
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}
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go func() {
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res := &setWatchesResponse{}
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_, err := c.request(opSetWatches, req, res, nil)
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if err != nil {
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log.Printf("Failed to set previous watches: %s", err.Error())
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}
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}()
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}
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func (c *Conn) authenticate() error {
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buf := make([]byte, 256)
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// connect request
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n, err := encodePacket(buf[4:], &connectRequest{
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ProtocolVersion: protocolVersion,
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LastZxidSeen: c.lastZxid,
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TimeOut: c.timeout,
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SessionID: c.sessionID,
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Passwd: c.passwd,
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})
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if err != nil {
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return err
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}
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binary.BigEndian.PutUint32(buf[:4], uint32(n))
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_, err = c.conn.Write(buf[:n+4])
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if err != nil {
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return err
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}
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c.sendSetWatches()
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// connect response
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// package length
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_, err = io.ReadFull(c.conn, buf[:4])
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if err != nil {
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return err
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}
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blen := int(binary.BigEndian.Uint32(buf[:4]))
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if cap(buf) < blen {
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buf = make([]byte, blen)
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}
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_, err = io.ReadFull(c.conn, buf[:blen])
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if err != nil {
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return err
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}
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r := connectResponse{}
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_, err = decodePacket(buf[:blen], &r)
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if err != nil {
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return err
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}
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if r.SessionID == 0 {
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c.sessionID = 0
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c.passwd = emptyPassword
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c.lastZxid = 0
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c.setState(StateExpired)
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return ErrSessionExpired
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}
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if c.sessionID != r.SessionID {
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atomic.StoreInt32(&c.xid, 0)
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}
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c.timeout = r.TimeOut
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c.sessionID = r.SessionID
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c.passwd = r.Passwd
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c.setState(StateHasSession)
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return nil
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}
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func (c *Conn) sendLoop(conn net.Conn, closeChan <-chan bool) error {
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pingTicker := time.NewTicker(c.pingInterval)
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defer pingTicker.Stop()
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buf := make([]byte, bufferSize)
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for {
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select {
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case req := <-c.sendChan:
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header := &requestHeader{req.xid, req.opcode}
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n, err := encodePacket(buf[4:], header)
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if err != nil {
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req.recvChan <- response{-1, err}
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continue
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}
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n2, err := encodePacket(buf[4+n:], req.pkt)
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if err != nil {
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req.recvChan <- response{-1, err}
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continue
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}
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n += n2
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binary.BigEndian.PutUint32(buf[:4], uint32(n))
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c.requestsLock.Lock()
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select {
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case <-closeChan:
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req.recvChan <- response{-1, ErrConnectionClosed}
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c.requestsLock.Unlock()
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return ErrConnectionClosed
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default:
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}
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c.requests[req.xid] = req
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c.requestsLock.Unlock()
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conn.SetWriteDeadline(time.Now().Add(c.recvTimeout))
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_, err = conn.Write(buf[:n+4])
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conn.SetWriteDeadline(time.Time{})
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if err != nil {
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req.recvChan <- response{-1, err}
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conn.Close()
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return err
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}
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case <-pingTicker.C:
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n, err := encodePacket(buf[4:], &requestHeader{Xid: -2, Opcode: opPing})
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if err != nil {
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panic("zk: opPing should never fail to serialize")
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}
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binary.BigEndian.PutUint32(buf[:4], uint32(n))
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conn.SetWriteDeadline(time.Now().Add(c.recvTimeout))
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_, err = conn.Write(buf[:n+4])
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conn.SetWriteDeadline(time.Time{})
|
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if err != nil {
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conn.Close()
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return err
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}
|
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case <-closeChan:
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return nil
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}
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}
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}
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|
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func (c *Conn) recvLoop(conn net.Conn) error {
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buf := make([]byte, bufferSize)
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for {
|
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// package length
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conn.SetReadDeadline(time.Now().Add(c.recvTimeout))
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_, err := io.ReadFull(conn, buf[:4])
|
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if err != nil {
|
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return err
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}
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|
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blen := int(binary.BigEndian.Uint32(buf[:4]))
|
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if cap(buf) < blen {
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buf = make([]byte, blen)
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}
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|
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_, err = io.ReadFull(conn, buf[:blen])
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conn.SetReadDeadline(time.Time{})
|
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if err != nil {
|
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return err
|
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}
|
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|
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res := responseHeader{}
|
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_, err = decodePacket(buf[:16], &res)
|
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if err != nil {
|
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return err
|
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}
|
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|
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if res.Xid == -1 {
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res := &watcherEvent{}
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_, err := decodePacket(buf[16:16+blen], res)
|
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if err != nil {
|
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return err
|
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}
|
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ev := Event{
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Type: res.Type,
|
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State: res.State,
|
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Path: res.Path,
|
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Err: nil,
|
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}
|
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select {
|
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case c.eventChan <- ev:
|
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default:
|
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}
|
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wTypes := make([]watchType, 0, 2)
|
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switch res.Type {
|
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case EventNodeCreated:
|
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wTypes = append(wTypes, watchTypeExist)
|
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case EventNodeDeleted, EventNodeDataChanged:
|
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wTypes = append(wTypes, watchTypeExist, watchTypeData, watchTypeChild)
|
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case EventNodeChildrenChanged:
|
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wTypes = append(wTypes, watchTypeChild)
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}
|
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c.watchersLock.Lock()
|
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for _, t := range wTypes {
|
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wpt := watchPathType{res.Path, t}
|
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if watchers := c.watchers[wpt]; watchers != nil && len(watchers) > 0 {
|
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for _, ch := range watchers {
|
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ch <- ev
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close(ch)
|
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}
|
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delete(c.watchers, wpt)
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}
|
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}
|
|
c.watchersLock.Unlock()
|
|
} else if res.Xid == -2 {
|
|
// Ping response. Ignore.
|
|
} else if res.Xid < 0 {
|
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log.Printf("Xid < 0 (%d) but not ping or watcher event", res.Xid)
|
|
} else {
|
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if res.Zxid > 0 {
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c.lastZxid = res.Zxid
|
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}
|
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|
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c.requestsLock.Lock()
|
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req, ok := c.requests[res.Xid]
|
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if ok {
|
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delete(c.requests, res.Xid)
|
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}
|
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c.requestsLock.Unlock()
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|
|
if !ok {
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log.Printf("Response for unknown request with xid %d", res.Xid)
|
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} else {
|
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if res.Err != 0 {
|
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err = res.Err.toError()
|
|
} else {
|
|
_, err = decodePacket(buf[16:16+blen], req.recvStruct)
|
|
}
|
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if req.recvFunc != nil {
|
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req.recvFunc(req, &res, err)
|
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}
|
|
req.recvChan <- response{res.Zxid, err}
|
|
if req.opcode == opClose {
|
|
return io.EOF
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *Conn) nextXid() int32 {
|
|
return atomic.AddInt32(&c.xid, 1)
|
|
}
|
|
|
|
func (c *Conn) addWatcher(path string, watchType watchType) <-chan Event {
|
|
c.watchersLock.Lock()
|
|
defer c.watchersLock.Unlock()
|
|
|
|
ch := make(chan Event, 1)
|
|
wpt := watchPathType{path, watchType}
|
|
c.watchers[wpt] = append(c.watchers[wpt], ch)
|
|
return ch
|
|
}
|
|
|
|
func (c *Conn) queueRequest(opcode int32, req interface{}, res interface{}, recvFunc func(*request, *responseHeader, error)) <-chan response {
|
|
rq := &request{
|
|
xid: c.nextXid(),
|
|
opcode: opcode,
|
|
pkt: req,
|
|
recvStruct: res,
|
|
recvChan: make(chan response, 1),
|
|
recvFunc: recvFunc,
|
|
}
|
|
c.sendChan <- rq
|
|
return rq.recvChan
|
|
}
|
|
|
|
func (c *Conn) request(opcode int32, req interface{}, res interface{}, recvFunc func(*request, *responseHeader, error)) (int64, error) {
|
|
r := <-c.queueRequest(opcode, req, res, recvFunc)
|
|
return r.zxid, r.err
|
|
}
|
|
|
|
func (c *Conn) AddAuth(scheme string, auth []byte) error {
|
|
_, err := c.request(opSetAuth, &setAuthRequest{Type: 0, Scheme: scheme, Auth: auth}, &setAuthResponse{}, nil)
|
|
return err
|
|
}
|
|
|
|
func (c *Conn) Children(path string) ([]string, Stat, error) {
|
|
res := &getChildren2Response{}
|
|
_, err := c.request(opGetChildren2, &getChildren2Request{Path: path, Watch: false}, res, nil)
|
|
return res.Children, &res.Stat, err
|
|
}
|
|
|
|
func (c *Conn) ChildrenW(path string) ([]string, Stat, <-chan Event, error) {
|
|
var ech <-chan Event
|
|
res := &getChildren2Response{}
|
|
_, err := c.request(opGetChildren2, &getChildren2Request{Path: path, Watch: true}, res, func(req *request, res *responseHeader, err error) {
|
|
if err == nil {
|
|
ech = c.addWatcher(path, watchTypeChild)
|
|
}
|
|
})
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
return res.Children, &res.Stat, ech, err
|
|
}
|
|
|
|
func (c *Conn) Get(path string) ([]byte, Stat, error) {
|
|
res := &getDataResponse{}
|
|
_, err := c.request(opGetData, &getDataRequest{Path: path, Watch: false}, res, nil)
|
|
return res.Data, &res.Stat, err
|
|
}
|
|
|
|
// GetW returns the contents of a znode and sets a watch
|
|
func (c *Conn) GetW(path string) ([]byte, Stat, <-chan Event, error) {
|
|
var ech <-chan Event
|
|
res := &getDataResponse{}
|
|
_, err := c.request(opGetData, &getDataRequest{Path: path, Watch: true}, res, func(req *request, res *responseHeader, err error) {
|
|
if err == nil {
|
|
ech = c.addWatcher(path, watchTypeData)
|
|
}
|
|
})
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
return res.Data, &res.Stat, ech, err
|
|
}
|
|
|
|
func (c *Conn) Set(path string, data []byte, version int32) (Stat, error) {
|
|
res := &setDataResponse{}
|
|
_, err := c.request(opSetData, &SetDataRequest{path, data, version}, res, nil)
|
|
return &res.Stat, err
|
|
}
|
|
|
|
func (c *Conn) Create(path string, data []byte, flags int32, acl []ACL) (string, error) {
|
|
res := &createResponse{}
|
|
_, err := c.request(opCreate, &CreateRequest{path, data, acl, flags}, res, nil)
|
|
return res.Path, err
|
|
}
|
|
|
|
// CreateProtectedEphemeralSequential fixes a race condition if the server crashes
|
|
// after it creates the node. On reconnect the session may still be valid so the
|
|
// ephemeral node still exists. Therefore, on reconnect we need to check if a node
|
|
// with a GUID generated on create exists.
|
|
func (c *Conn) CreateProtectedEphemeralSequential(path string, data []byte, acl []ACL) (string, error) {
|
|
var guid [16]byte
|
|
_, err := io.ReadFull(rand.Reader, guid[:16])
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
guidStr := fmt.Sprintf("%x", guid)
|
|
|
|
parts := strings.Split(path, "/")
|
|
parts[len(parts)-1] = fmt.Sprintf("%s%s-%s", protectedPrefix, guidStr, parts[len(parts)-1])
|
|
rootPath := strings.Join(parts[:len(parts)-1], "/")
|
|
protectedPath := strings.Join(parts, "/")
|
|
|
|
var newPath string
|
|
for i := 0; i < 3; i++ {
|
|
newPath, err = c.Create(protectedPath, data, FlagEphemeral|FlagSequence, acl)
|
|
switch err {
|
|
case ErrSessionExpired:
|
|
// No need to search for the node since it can't exist. Just try again.
|
|
case ErrConnectionClosed:
|
|
children, _, err := c.Children(rootPath)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
for _, p := range children {
|
|
parts := strings.Split(p, "/")
|
|
if pth := parts[len(parts)-1]; strings.HasPrefix(pth, protectedPrefix) {
|
|
if g := pth[len(protectedPrefix) : len(protectedPrefix)+32]; g == guidStr {
|
|
return rootPath + "/" + p, nil
|
|
}
|
|
}
|
|
}
|
|
case nil:
|
|
return newPath, nil
|
|
default:
|
|
return "", err
|
|
}
|
|
}
|
|
return "", err
|
|
}
|
|
|
|
func (c *Conn) Delete(path string, version int32) error {
|
|
_, err := c.request(opDelete, &DeleteRequest{path, version}, &deleteResponse{}, nil)
|
|
return err
|
|
}
|
|
|
|
func (c *Conn) Exists(path string) (bool, Stat, error) {
|
|
res := &existsResponse{}
|
|
_, err := c.request(opExists, &existsRequest{Path: path, Watch: false}, res, nil)
|
|
exists := true
|
|
if err == ErrNoNode {
|
|
exists = false
|
|
err = nil
|
|
}
|
|
return exists, &res.Stat, err
|
|
}
|
|
|
|
func (c *Conn) ExistsW(path string) (bool, Stat, <-chan Event, error) {
|
|
var ech <-chan Event
|
|
res := &existsResponse{}
|
|
_, err := c.request(opExists, &existsRequest{Path: path, Watch: true}, res, func(req *request, res *responseHeader, err error) {
|
|
if err == nil {
|
|
ech = c.addWatcher(path, watchTypeData)
|
|
} else if err == ErrNoNode {
|
|
ech = c.addWatcher(path, watchTypeExist)
|
|
}
|
|
})
|
|
exists := true
|
|
if err == ErrNoNode {
|
|
exists = false
|
|
err = nil
|
|
}
|
|
if err != nil {
|
|
return false, nil, nil, err
|
|
}
|
|
return exists, &res.Stat, ech, err
|
|
}
|
|
|
|
func (c *Conn) GetACL(path string) ([]ACL, Stat, error) {
|
|
res := &getAclResponse{}
|
|
_, err := c.request(opGetAcl, &getAclRequest{Path: path}, res, nil)
|
|
return res.Acl, &res.Stat, err
|
|
}
|
|
|
|
func (c *Conn) SetACL(path string, acl []ACL, version int32) (Stat, error) {
|
|
res := &setAclResponse{}
|
|
_, err := c.request(opSetAcl, &setAclRequest{Path: path, Acl: acl, Version: version}, res, nil)
|
|
return &res.Stat, err
|
|
}
|
|
|
|
func (c *Conn) Sync(path string) (string, error) {
|
|
res := &syncResponse{}
|
|
_, err := c.request(opSync, &syncRequest{Path: path}, res, nil)
|
|
return res.Path, err
|
|
}
|
|
|
|
type MultiOps struct {
|
|
Create []CreateRequest
|
|
Delete []DeleteRequest
|
|
SetData []SetDataRequest
|
|
Check []CheckVersionRequest
|
|
}
|
|
|
|
func (c *Conn) Multi(ops MultiOps) error {
|
|
req := &multiRequest{
|
|
Ops: make([]multiRequestOp, 0, len(ops.Create)+len(ops.Delete)+len(ops.SetData)+len(ops.Check)),
|
|
DoneHeader: multiHeader{Type: -1, Done: true, Err: -1},
|
|
}
|
|
for _, r := range ops.Create {
|
|
req.Ops = append(req.Ops, multiRequestOp{multiHeader{opCreate, false, -1}, r})
|
|
}
|
|
for _, r := range ops.SetData {
|
|
req.Ops = append(req.Ops, multiRequestOp{multiHeader{opSetData, false, -1}, r})
|
|
}
|
|
for _, r := range ops.Delete {
|
|
req.Ops = append(req.Ops, multiRequestOp{multiHeader{opDelete, false, -1}, r})
|
|
}
|
|
for _, r := range ops.Check {
|
|
req.Ops = append(req.Ops, multiRequestOp{multiHeader{opCheck, false, -1}, r})
|
|
}
|
|
res := &multiResponse{}
|
|
_, err := c.request(opMulti, req, res, nil)
|
|
return err
|
|
}
|