// initProxy reads the configuration from the engine and configures the server
func initProxy(ng engine.Engine, p proxy.Proxy) (uint64, error) {
snapshot, err := ng.GetSnapshot()
if err != nil {
// Some legacy engines do not implement `GetSnapshot` so we resort to
// a slow method of obtaining configuration from Etcd.
if _, ok := err.(*engine.SnapshotNotSupportedError); ok {
return 0, initProxySlow(ng, p)
}
return 0, err
}
for _, h := range snapshot.Hosts {
if err := p.UpsertHost(h); err != nil {
return 0, err
}
}
for _, bs := range snapshot.BackendSpecs {
if err := p.UpsertBackend(bs.Backend); err != nil {
return 0, err
}
for _, server := range bs.Servers {
if err := p.UpsertServer(bs.Backend.GetUniqueId(), server); err != nil {
return 0, err
}
}
}
for _, l := range snapshot.Listeners {
if err := p.UpsertListener(l); err != nil {
return 0, err
}
}
for _, fs := range snapshot.FrontendSpecs {
if err := p.UpsertFrontend(fs.Frontend); err != nil {
return 0, err
}
for _, m := range fs.Middlewares {
if err := p.UpsertMiddleware(fs.Frontend.GetKey(), m); err != nil {
return 0, err
}
}
}
return snapshot.Index, nil
}
