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Change LoadBalancer methods to take api.Service

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This is a better abstraction than passing in specific pieces of the
Service that each of the cloudproviders may or may not need. For
instance, many of the providers don't need a region, yet this is passed
in. Similarly many of the providers want a string IP for the load
balancer, but it passes in a converted net ip. Affinity is unused by
AWS. A provider change may also require adding a new parameter which has
an effect on all other cloud provider implementations.

Further, this will simplify adding provider specific load balancer
options, such as with labels or some other metadata. For example, we
could add labels for configuring the details of an AWS elastic load
balancer, such as idle timeout on connections, whether it is
internal or external, cross-zone load balancing, and so on.

Authors: @chbatey, @jsravn
This commit is contained in:
Chris Batey and James Ravn
2016-02-17 11:36:50 +00:00
committed by Chris Batey
parent 76369c42be
commit be9ce30897
10 changed files with 254 additions and 243 deletions
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14
pkg/cloudprovider/cloud.go
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@@ -19,11 +19,9 @@ package cloudprovider
import (
"errors"
"fmt"
"net"
"strings"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/types"
)
// Interface is an abstract, pluggable interface for cloud providers.
@@ -82,18 +80,22 @@ type LoadBalancer interface {
// TODO: Break this up into different interfaces (LB, etc) when we have more than one type of service
// GetLoadBalancer returns whether the specified load balancer exists, and
// if so, what its status is.
GetLoadBalancer(name, region string) (status *api.LoadBalancerStatus, exists bool, err error)
// Implementations must treat the *api.Service parameter as read-only and not modify it.
GetLoadBalancer(service *api.Service) (status *api.LoadBalancerStatus, exists bool, err error)
// EnsureLoadBalancer creates a new load balancer 'name', or updates the existing one. Returns the status of the balancer
EnsureLoadBalancer(name, region string, loadBalancerIP net.IP, ports []*api.ServicePort, hosts []string, serviceName types.NamespacedName, affinityType api.ServiceAffinity, annotations map[string]string) (*api.LoadBalancerStatus, error)
// Implementations must treat the *api.Service parameter as read-only and not modify it.
EnsureLoadBalancer(service *api.Service, hosts []string, annotations map[string]string) (*api.LoadBalancerStatus, error)
// UpdateLoadBalancer updates hosts under the specified load balancer.
UpdateLoadBalancer(name, region string, hosts []string) error
// Implementations must treat the *api.Service parameter as read-only and not modify it.
UpdateLoadBalancer(service *api.Service, hosts []string) error
// EnsureLoadBalancerDeleted deletes the specified load balancer if it
// exists, returning nil if the load balancer specified either didn't exist or
// was successfully deleted.
// This construction is useful because many cloud providers' load balancers
// have multiple underlying components, meaning a Get could say that the LB
// doesn't exist even if some part of it is still laying around.
EnsureLoadBalancerDeleted(name, region string) error
// Implementations must treat the *api.Service parameter as read-only and not modify it.
EnsureLoadBalancerDeleted(service *api.Service) error
}
// Instances is an abstract, pluggable interface for sets of instances.