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Implement multi-port endpoints

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Instead of endpoints being a flat list, it is now a list of "subsets"
where each is a struct of {Addresses, Ports}.  To generate the list of
endpoints you need to take union of the Cartesian products of the
subsets.  This is compact in the vast majority of cases, yet still
represents named ports and corner cases (e.g. each pod has a different
port number).

This also stores subsets in a deterministic order (sorted by hash) to
avoid spurious updates and comparison problems.

This is a fully compatible change - old objects and clients will
keepworking as long as they don't need the new functionality.

This is the prep for multi-port Services, which will add API to produce
endpoints in this new structure.
This commit is contained in:
Tim Hockin
2015-03-20 14:24:43 -07:00
parent 3eda80b3c5
commit 8ae203825b
43 changed files with 2090 additions and 1030 deletions
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8
pkg/proxy/loadbalancer.go
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@@ -26,8 +26,8 @@ import (
// LoadBalancer is an interface for distributing incoming requests to service endpoints.
type LoadBalancer interface {
// NextEndpoint returns the endpoint to handle a request for the given
// service and source address.
NextEndpoint(service types.NamespacedName, srcAddr net.Addr) (string, error)
NewService(service types.NamespacedName, sessionAffinityType api.AffinityType, stickyMaxAgeMinutes int) error
CleanupStaleStickySessions(service types.NamespacedName)
// service-port and source address.
NextEndpoint(service types.NamespacedName, port string, srcAddr net.Addr) (string, error)
NewService(service types.NamespacedName, port string, sessionAffinityType api.AffinityType, stickyMaxAgeMinutes int) error
CleanupStaleStickySessions(service types.NamespacedName, port string)
}