func (dests ServiceDests) get(ipvsDest ipvs.Dest) Dest {
if dest, exists := dests[ipvsDest.String()]; exists {
return dest
} else {
dest := Dest{
Dest: ipvsDest,
}
dests[dest.String()] = dest
return dest
}
}
func (dests ServiceDests) config(ipvsDest ipvs.Dest) {
dest, exists := dests[ipvsDest.String()]
if exists {
// merge
dest.Weight += ipvsDest.Weight
} else {
dest = Dest{
Dest: ipvsDest,
}
}
dests[ipvsDest.String()] = dest
}
func configServiceBackend(ipvsService ipvs.Service, backend config.ServiceBackend, routes Routes, options IPVSOptions) (*ipvs.Dest, error) {
ipvsDest := ipvs.Dest{
FwdMethod: options.FwdMethod, // default, overriden by route
Weight: uint32(backend.Weight),
}
switch ipvsService.Af {
case syscall.AF_INET:
if backend.IPv4 == "" {
return nil, nil
} else if ip := net.ParseIP(backend.IPv4); ip == nil {
return nil, fmt.Errorf("Invalid IPv4: %v", backend.IPv4)
} else if ip4 := ip.To4(); ip4 == nil {
return nil, fmt.Errorf("Invalid IPv4: %v", ip)
} else {
ipvsDest.Addr = ip4
}
case syscall.AF_INET6:
if backend.IPv6 == "" {
return nil, nil
} else if ip := net.ParseIP(backend.IPv6); ip == nil {
return nil, fmt.Errorf("Invalid IPv6: %v", backend.IPv6)
} else if ip16 := ip.To16(); ip16 == nil {
return nil, fmt.Errorf("Invalid IPv6: %v", ip)
} else {
ipvsDest.Addr = ip16
}
default:
panic("invalid af")
}
switch ipvsService.Protocol {
case syscall.IPPROTO_TCP:
if backend.TCP == 0 {
return nil, nil
} else {
ipvsDest.Port = backend.TCP
}
case syscall.IPPROTO_UDP:
if backend.UDP == 0 {
return nil, nil
} else {
ipvsDest.Port = backend.UDP
}
default:
panic("invalid proto")
}
// apply routes
route := routes.Lookup(ipvsDest.Addr)
if route == nil {
// as-is
return &ipvsDest, nil
} else if route.IPVSMethod == nil {
// ignore
return nil, nil
} else {
ipvsDest.FwdMethod = *route.IPVSMethod
}
// IPVS chaning to next frontend
if route.Gateway != nil {
// TODO: mixed-family routes
ipvsDest.Addr = route.Gateway
ipvsDest.Port = ipvsService.Port
}
return &ipvsDest, nil
}