/*
Create a proxy that listens on 0.0.0.0:27017 and foward to hosts
registered under service key /srv/mongo_router/debug, trying them in
order.
New set of hosts is obtained on nodes joining or leaving service
/srv/mongo_router/debug, followed by connection reset.
See coreos/etcd https://github.com/coreos/etcd for more information on
discovery backend
*/
func ExampleSrv_discovery() {
pxyOpts := &proxy.ConnOptions{
Net: "tcp4",
From: ":27017",
Discovery: &proxy.DiscOptions{
Service: "/srv/mongo_router/debug",
Endpoints: []string{"http://10.0.1.11:2379", "http://10.0.2.13:2379"},
},
}
context, cancel := ctx.WithCancel(ctx.Background())
defer cancel()
err := proxy.Srv(context, pxyOpts)
log.Warning(err)
}
func listen(wk ctx.Context, opts *proxy.ConnOptions) (halt <-chan struct{}) {
var err error
ending := make(chan struct{}, 1)
go func() {
defer close(ending)
logger := log.WithFields(log.Fields{
"Net": opts.Net,
"To": opts.To,
"Balance": opts.Balance,
})
if len(opts.FromRange) > 0 {
logger = logger.WithFields(log.Fields{
"FromRange": opts.FromRange,
})
} else {
logger = logger.WithFields(log.Fields{
"From": opts.From,
})
}
if opts.Discovery != nil {
logger = logger.WithFields(log.Fields{
"Endpoints": opts.Discovery.Endpoints,
"Service": opts.Discovery.Service,
})
}
logger.Info("begin")
if opts.Discovery != nil {
if len(opts.FromRange) == 0 {
err = proxy.Srv(wk, opts)
} else {
err = proxy.ClusterSrv(wk, opts)
}
} else if len(opts.To) != 0 {
if len(opts.FromRange) == 0 {
err = proxy.To(wk, opts)
} else {
err = proxy.ClusterTo(wk, opts)
}
} else {
err = errors.New("Misconfigured connect options")
}
logger.WithFields(log.Fields{"err": err}).Warning("end")
}()
return ending
}