62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
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package multinet
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import (
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"context"
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"errors"
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"net"
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"sync/atomic"
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)
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// BalancerType reperents the algorithm which is used to pick source address.
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type BalancerType string
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const (
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// BalancerTypeNoop picks first address for which link is up.
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BalancerTypeNoop BalancerType = ""
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// BalancerTypeNoop implements simple round-robin between up links.
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// It is not fair in case some links are down.
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BalancerTypeRoundRobin BalancerType = "roundrobin"
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)
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type balancer interface {
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DialContext(ctx context.Context, s *Subnet, network, address string) (net.Conn, error)
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}
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type roundRobin struct {
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d *dialer
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i atomic.Uint32
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}
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func (r *roundRobin) DialContext(ctx context.Context, s *Subnet, network, address string) (net.Conn, error) {
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next := int(r.i.Add(1))
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for i := range s.Interfaces {
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ii := s.Interfaces[(i+next)%len(s.Interfaces)]
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if ii.Down {
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continue
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}
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dd := r.d.dialer
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dd.LocalAddr = ii.LocalAddr
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return r.d.dialContext(&dd, ctx, "tcp", address)
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}
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return nil, errors.New("(*roundRobin).DialContext: no suitale node found")
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}
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type firstEnabled struct {
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d *dialer
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}
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func (r *firstEnabled) DialContext(ctx context.Context, s *Subnet, network, address string) (net.Conn, error) {
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for i := range s.Interfaces {
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ii := s.Interfaces[i%len(s.Interfaces)]
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if ii.Down {
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continue
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}
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dd := r.d.dialer
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dd.LocalAddr = ii.LocalAddr
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return r.d.dialContext(&dd, ctx, "tcp", address)
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}
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return nil, errors.New("(*firstEnabled).DialContext: no suitale node found")
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}
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