func (c *simpleConnector) dial() (core.Stream, error) {
bareConn, err := util.AutoDial(c.backendAddr)
if err != nil {
return nil, fmt.Errorf("could not connect to %v: %v", c.backendAddr, err)
}
// the simpleConnector always prefers TLS
beConn, err := util.NegotiateTLS(bareConn, &util.SSLConfig{
Mode: util.SSLPrefer,
Config: tls.Config{InsecureSkipVerify: true},
})
if err != nil {
return nil, fmt.Errorf("could not negotiate TLS: %v", err)
}
return core.NewBackendStream(beConn), nil
}
func logWorker(die dieCh, l net.Listener, cfg logplexc.Config, sr *serveRecord) {
// Make world-writable so anything can connect and send logs.
// This may be be worth locking down more, but as-is unless
// pg_logplexcollector and the Postgres server share the same
// running user common umasks will be useless.
fi, err := os.Stat(sr.P)
if err != nil {
log.Fatalf(
"exiting, cannot stat just created socket %q: %v",
sr.P, err)
}
err = os.Chmod(sr.P, fi.Mode().Perm()|0222)
if err != nil {
log.Fatalf(
"exiting, cannot make just created socket "+
"world-writable %q: %v",
sr.P, err)
}
for {
select {
case <-die:
log.Print("listener exits normally from die request")
return
default:
break
}
conn, err := l.Accept()
if err != nil {
log.Printf("accept error: %v", err)
}
if err != nil {
log.Fatalf("serve database suffers unrecoverable "+
"error: %v", err)
}
go func() {
stream := core.NewBackendStream(conn)
var exit exitFn
exit = func(args ...interface{}) {
if len(args) == 1 {
log.Printf("Disconnect client: %v", args[0])
} else if len(args) > 1 {
if s, ok := args[0].(string); ok {
log.Printf(s, args[1:]...)
} else {
// Not an intended use case, but do
// one's best to print something.
log.Printf("Got a malformed exit: %v", args)
}
}
panic(&exit)
}
// Recovers from panic and exits in an orderly manner if (and
// only if) exit() is called; otherwise propagate the panic
// normally.
defer func() {
conn.Close()
// &exit is used as a sentinel value.
if r := recover(); r != nil && r != &exit {
panic(r)
}
}()
var msgInit msgInit
msgInit = func(m *core.Message, exit exitFn) {
err = stream.Next(m)
if err == io.EOF {
exit("postgres client disconnects")
} else if err != nil {
exit("could not read next message: %v", err)
}
}
// Protocol start-up; packets that are only received once.
processVerMsg(msgInit, exit)
ident := processIdentMsg(msgInit, exit)
log.Printf("client connects with identifier %q", ident)
// Resolve the identifier to a serve
if sr.I != ident {
exit("got unexpected identifier for socket: "+
"path %s, expected %s, got %s", sr.P, sr.I, ident)
}
// Set up client with serve
client := func(cfg logplexc.Config, url *url.URL) *logplexc.Client {
cfg.Logplex = *url
client, err := logplexc.NewClient(&cfg)
if err != nil {
exit(err)
}
return client
}
primary := client(cfg, &sr.u)
var audit *logplexc.Client
if sr.audit != nil {
audit = client(cfg, sr.audit)
}
defer func() {
primary.Close()
if audit != nil {
audit.Close()
}
}()
processLogMsg(die, primary, audit, msgInit, sr, exit)
}()
}
}