mirror of
https://github.com/42wim/matterbridge.git
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77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
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package srslog
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import (
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"io"
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"net"
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"time"
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)
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// netConn has an internal net.Conn and adheres to the serverConn interface,
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// allowing us to send syslog messages over the network.
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type netConn struct {
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conn net.Conn
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done chan interface{}
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}
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// newNetConn creates a netConn instance that is monitored for unexpected socket closure.
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func newNetConn(conn net.Conn) *netConn {
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nc := &netConn{conn: conn, done: make(chan interface{})}
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go monitor(nc.conn, nc.done)
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return nc
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}
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// writeString formats syslog messages using time.RFC3339 and includes the
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// hostname, and sends the message to the connection.
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func (n *netConn) writeString(framer Framer, formatter Formatter, p Priority, hostname, tag, msg string) error {
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if framer == nil {
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framer = DefaultFramer
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}
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if formatter == nil {
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formatter = DefaultFormatter
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}
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formattedMessage := framer(formatter(p, hostname, tag, msg))
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_, err := n.conn.Write([]byte(formattedMessage))
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return err
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}
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// close the network connection
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func (n *netConn) close() error {
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// signal monitor goroutine to exit
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close(n.done)
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// wake up monitor blocked on read (close usually is enough)
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_ = n.conn.SetReadDeadline(time.Now())
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// close the connection
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return n.conn.Close()
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}
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// monitor continuously tries to read from the connection to detect socket close.
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// This is needed because syslog server uses a write only socket and Linux systems
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// take a long time to detect a loss of connectivity on a socket when only writing;
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// the writes simply fail without an error returned.
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func monitor(conn net.Conn, done chan interface{}) {
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defer Logger.Println("monitor exit")
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buf := make([]byte, 1)
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for {
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Logger.Println("monitor loop")
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select {
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case <-done:
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return
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case <-time.After(1 * time.Second):
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}
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err := conn.SetReadDeadline(time.Now().Add(time.Second * 30))
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if err != nil {
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continue
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}
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_, err = conn.Read(buf)
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Logger.Println("monitor -- ", err)
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if err == io.EOF {
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Logger.Println("monitor close conn")
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conn.Close()
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}
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}
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}
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