102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
package server
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import (
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"encoding/binary"
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"net"
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"github.com/lbryio/herald.go/internal"
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"github.com/sirupsen/logrus"
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)
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const NotifierResponseLength = 40
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// AddHeightSub adds a new height subscriber
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func (s *Server) AddHeightSub(addr net.Addr, conn net.Conn) {
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s.HeightSubsMut.Lock()
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defer s.HeightSubsMut.Unlock()
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s.HeightSubs[addr] = conn
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}
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// DoNotify sends a notification to all height subscribers
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func (s *Server) DoNotify(heightHash *internal.HeightHash) error {
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buff := make([]byte, NotifierResponseLength)
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toDelete := make([]net.Addr, 0)
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s.HeightSubsMut.RLock()
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for addr, conn := range s.HeightSubs {
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// struct.pack(b'>Q32s', height, block_hash)
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binary.BigEndian.PutUint64(buff, heightHash.Height)
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copy(buff[8:], heightHash.BlockHash[:32])
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logrus.Tracef("notifying %s", addr)
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n, err := conn.Write(buff)
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if err != nil {
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logrus.Warn(err)
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toDelete = append(toDelete, addr)
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}
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if n != NotifierResponseLength {
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logrus.Warn("not all bytes written")
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}
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}
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s.HeightSubsMut.RUnlock()
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if len(toDelete) > 0 {
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s.HeightSubsMut.Lock()
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for _, v := range toDelete {
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delete(s.HeightSubs, v)
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}
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s.HeightSubsMut.Unlock()
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}
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return nil
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}
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// RunNotifier Runs the notfying action forever
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func (s *Server) RunNotifier() error {
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for notification := range s.NotifierChan {
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switch notification.(type) {
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case internal.HeightHash:
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heightHash, _ := notification.(internal.HeightHash)
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s.DoNotify(&heightHash)
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}
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s.sessionManager.doNotify(notification)
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}
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return nil
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}
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// NotifierServer implements the TCP protocol for height/blockheader notifications
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func (s *Server) NotifierServer() error {
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address := ":" + s.Args.NotifierPort
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addr, err := net.ResolveTCPAddr("tcp", address)
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if err != nil {
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return err
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}
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listen, err := net.ListenTCP("tcp", addr)
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if err != nil {
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return err
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}
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defer listen.Close()
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for {
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logrus.Info("Waiting for connection")
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conn, err := listen.Accept()
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if err != nil {
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logrus.Warn(err)
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continue
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}
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addr := conn.RemoteAddr()
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logrus.Println(addr)
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// _, err = conn.Write([]byte(addr.String()))
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// if err != nil {
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// logrus.Warn(err)
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// continue
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// }
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go s.AddHeightSub(addr, conn)
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}
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}
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