mirror of
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105 lines
3.3 KiB
Go
105 lines
3.3 KiB
Go
package srslog
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import (
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"crypto/tls"
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"net"
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)
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// dialerFunctionWrapper is a simple object that consists of a dialer function
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// and its name. This is primarily for testing, so we can make sure that the
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// getDialer method returns the correct dialer function. However, if you ever
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// find that you need to check which dialer function you have, this would also
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// be useful for you without having to use reflection.
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type dialerFunctionWrapper struct {
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Name string
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Dialer func() (serverConn, string, error)
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}
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// Call the wrapped dialer function and return its return values.
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func (df dialerFunctionWrapper) Call() (serverConn, string, error) {
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return df.Dialer()
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}
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// getDialer returns a "dialer" function that can be called to connect to a
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// syslog server.
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//
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// Each dialer function is responsible for dialing the remote host and returns
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// a serverConn, the hostname (or a default if the Writer has not specified a
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// hostname), and an error in case dialing fails.
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//
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// The reason for separate dialers is that different network types may need
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// to dial their connection differently, yet still provide a net.Conn interface
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// that you can use once they have dialed. Rather than an increasingly long
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// conditional, we have a map of network -> dialer function (with a sane default
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// value), and adding a new network type is as easy as writing the dialer
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// function and adding it to the map.
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func (w *Writer) getDialer() dialerFunctionWrapper {
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dialers := map[string]dialerFunctionWrapper{
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"": dialerFunctionWrapper{"unixDialer", w.unixDialer},
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"tcp+tls": dialerFunctionWrapper{"tlsDialer", w.tlsDialer},
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"custom": dialerFunctionWrapper{"customDialer", w.customDialer},
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}
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dialer, ok := dialers[w.network]
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if !ok {
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dialer = dialerFunctionWrapper{"basicDialer", w.basicDialer}
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}
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return dialer
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}
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// unixDialer uses the unixSyslog method to open a connection to the syslog
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// daemon running on the local machine.
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func (w *Writer) unixDialer() (serverConn, string, error) {
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sc, err := unixSyslog()
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hostname := w.hostname
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if hostname == "" {
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hostname = "localhost"
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}
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return sc, hostname, err
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}
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// tlsDialer connects to TLS over TCP, and is used for the "tcp+tls" network
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// type.
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func (w *Writer) tlsDialer() (serverConn, string, error) {
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c, err := tls.Dial("tcp", w.raddr, w.tlsConfig)
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var sc serverConn
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hostname := w.hostname
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if err == nil {
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sc = newNetConn(c)
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if hostname == "" {
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hostname = c.LocalAddr().String()
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}
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}
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return sc, hostname, err
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}
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// basicDialer is the most common dialer for syslog, and supports both TCP and
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// UDP connections.
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func (w *Writer) basicDialer() (serverConn, string, error) {
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c, err := net.Dial(w.network, w.raddr)
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var sc serverConn
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hostname := w.hostname
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if err == nil {
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sc = newNetConn(c)
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if hostname == "" {
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hostname = c.LocalAddr().String()
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}
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}
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return sc, hostname, err
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}
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// customDialer uses the custom dialer when the Writer was created
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// giving developers total control over how connections are made and returned.
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// Note it does not check if cdialer is nil, as it should only be referenced from getDialer.
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func (w *Writer) customDialer() (serverConn, string, error) {
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c, err := w.customDial(w.network, w.raddr)
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var sc serverConn
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hostname := w.hostname
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if err == nil {
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sc = newNetConn(c)
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if hostname == "" {
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hostname = c.LocalAddr().String()
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}
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}
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return sc, hostname, err
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}
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