proxy

Documentation

Overview

Package proxy implements the layer-3 network proxy.

Index

• type BaseEndpointInfo
  • func (info *BaseEndpointInfo) Equal(other Endpoint) bool
  • func (info *BaseEndpointInfo) GetIsLocal() bool
  • func (info *BaseEndpointInfo) IP() string
  • func (info *BaseEndpointInfo) Port() (int, error)
  • func (info *BaseEndpointInfo) String() string
• type BaseServiceInfo
  • func (info *BaseServiceInfo) ClusterIPString() string
  • func (info *BaseServiceInfo) ExternalIPStrings() []string
  • func (info *BaseServiceInfo) GetHealthCheckNodePort() int
  • func (info *BaseServiceInfo) GetNodePort() int
  • func (info *BaseServiceInfo) GetProtocol() v1.Protocol
  • func (info *BaseServiceInfo) LoadBalancerIPStrings() []string
  • func (info *BaseServiceInfo) String() string
• type Endpoint
• type EndpointChangeTracker
  • func NewEndpointChangeTracker(hostname string, makeEndpointInfo makeEndpointFunc, isIPv6Mode *bool, ...) *EndpointChangeTracker
  • func (ect *EndpointChangeTracker) Update(previous, current *v1.Endpoints) bool
• type EndpointsMap
  • func (em EndpointsMap) Update(changes *EndpointChangeTracker) (result UpdateEndpointMapResult)
• type ProxyProvider
• type ServiceChangeTracker
  • func NewServiceChangeTracker(makeServiceInfo makeServicePortFunc, isIPv6Mode *bool, ...) *ServiceChangeTracker
  • func (sct *ServiceChangeTracker) Update(previous, current *v1.Service) bool
• type ServiceEndpoint
• type ServiceMap
• type ServicePort
• type ServicePortName
  • func (spn ServicePortName) String() string
• type UpdateEndpointMapResult
• type UpdateServiceMapResult
  • func UpdateServiceMap(serviceMap ServiceMap, changes *ServiceChangeTracker) (result UpdateServiceMapResult)

Types

type BaseEndpointInfo

type BaseEndpointInfo struct {
	Endpoint string // TODO: should be an endpointString type
	// IsLocal indicates whether the endpoint is running in same host as kube-proxy.
	IsLocal bool
}

BaseEndpointInfo contains base information that defines an endpoint. This could be used directly by proxier while processing endpoints, or can be used for constructing a more specific EndpointInfo struct defined by the proxier if needed.

func (*BaseEndpointInfo) Equal

func (info *BaseEndpointInfo) Equal(other Endpoint) bool

Equal is part of proxy.Endpoint interface.

func (*BaseEndpointInfo) GetIsLocal

func (info *BaseEndpointInfo) GetIsLocal() bool

GetIsLocal is part of proxy.Endpoint interface.

func (*BaseEndpointInfo) IP

func (info *BaseEndpointInfo) IP() string

IP returns just the IP part of the endpoint, it's a part of proxy.Endpoint interface.

func (*BaseEndpointInfo) Port

func (info *BaseEndpointInfo) Port() (int, error)

Port returns just the Port part of the endpoint.

func (*BaseEndpointInfo) String

func (info *BaseEndpointInfo) String() string

String is part of proxy.Endpoint interface.

type BaseServiceInfo

type BaseServiceInfo struct {
	ClusterIP                net.IP
	Port                     int
	Protocol                 v1.Protocol
	NodePort                 int
	LoadBalancerStatus       v1.LoadBalancerStatus
	SessionAffinityType      v1.ServiceAffinity
	StickyMaxAgeSeconds      int
	ExternalIPs              []string
	LoadBalancerSourceRanges []string
	HealthCheckNodePort      int
	OnlyNodeLocalEndpoints   bool
}

BaseServiceInfo contains base information that defines a service. This could be used directly by proxier while processing services, or can be used for constructing a more specific ServiceInfo struct defined by the proxier if needed.

func (*BaseServiceInfo) ClusterIPString

func (info *BaseServiceInfo) ClusterIPString() string

ClusterIPString is part of ServicePort interface.

func (*BaseServiceInfo) ExternalIPStrings

func (info *BaseServiceInfo) ExternalIPStrings() []string

ExternalIPStrings is part of ServicePort interface.

func (*BaseServiceInfo) GetHealthCheckNodePort

func (info *BaseServiceInfo) GetHealthCheckNodePort() int

GetHealthCheckNodePort is part of ServicePort interface.

func (*BaseServiceInfo) GetNodePort

func (info *BaseServiceInfo) GetNodePort() int

GetNodePort is part of the ServicePort interface.

func (*BaseServiceInfo) GetProtocol

func (info *BaseServiceInfo) GetProtocol() v1.Protocol

GetProtocol is part of ServicePort interface.

func (*BaseServiceInfo) LoadBalancerIPStrings

func (info *BaseServiceInfo) LoadBalancerIPStrings() []string

LoadBalancerIPStrings is part of ServicePort interface.

func (*BaseServiceInfo) String

func (info *BaseServiceInfo) String() string

String is part of ServicePort interface.

type Endpoint

type Endpoint interface {
	// String returns endpoint string.  An example format can be: `IP:Port`.
	// We take the returned value as ServiceEndpoint.Endpoint.
	String() string
	// GetIsLocal returns true if the endpoint is running in same host as kube-proxy, otherwise returns false.
	GetIsLocal() bool
	// IP returns IP part of the endpoint.
	IP() string
	// Port returns the Port part of the endpoint.
	Port() (int, error)
	// Equal checks if two endpoints are equal.
	Equal(Endpoint) bool
}

Endpoint in an interface which abstracts information about an endpoint. TODO: Rename functions to be consistent with ServicePort.

type EndpointChangeTracker

type EndpointChangeTracker struct {
	// contains filtered or unexported fields
}

EndpointChangeTracker carries state about uncommitted changes to an arbitrary number of Endpoints, keyed by their namespace and name.

func NewEndpointChangeTracker

func NewEndpointChangeTracker(hostname string, makeEndpointInfo makeEndpointFunc, isIPv6Mode *bool, recorder record.EventRecorder) *EndpointChangeTracker

NewEndpointChangeTracker initializes an EndpointsChangeMap

func (*EndpointChangeTracker) Update

func (ect *EndpointChangeTracker) Update(previous, current *v1.Endpoints) bool

Update updates given service's endpoints change map based on the <previous, current> endpoints pair. It returns true if items changed, otherwise return false. Update can be used to add/update/delete items of EndpointsChangeMap. For example, Add item

• pass <nil, endpoints> as the <previous, current> pair.

Update item

• pass <oldEndpoints, endpoints> as the <previous, current> pair.

Delete item

• pass <endpoints, nil> as the <previous, current> pair.

type EndpointsMap

type EndpointsMap map[ServicePortName][]Endpoint

EndpointsMap maps a service name to a list of all its Endpoints.

func (EndpointsMap) Update

func (em EndpointsMap) Update(changes *EndpointChangeTracker) (result UpdateEndpointMapResult)

UpdateEndpointsMap updates endpointsMap base on the given changes.

type ProxyProvider

type ProxyProvider interface {
	config.EndpointsHandler
	config.ServiceHandler

	// Sync immediately synchronizes the ProxyProvider's current state to proxy rules.
	Sync()
	// SyncLoop runs periodic work.
	// This is expected to run as a goroutine or as the main loop of the app.
	// It does not return.
	SyncLoop()
}

ProxyProvider is the interface provided by proxier implementations.

type ServiceChangeTracker

type ServiceChangeTracker struct {
	// contains filtered or unexported fields
}

ServiceChangeTracker carries state about uncommitted changes to an arbitrary number of Services, keyed by their namespace and name.

func NewServiceChangeTracker

func NewServiceChangeTracker(makeServiceInfo makeServicePortFunc, isIPv6Mode *bool, recorder record.EventRecorder) *ServiceChangeTracker

NewServiceChangeTracker initializes a ServiceChangeTracker

func (*ServiceChangeTracker) Update

func (sct *ServiceChangeTracker) Update(previous, current *v1.Service) bool

Update updates given service's change map based on the <previous, current> service pair. It returns true if items changed, otherwise return false. Update can be used to add/update/delete items of ServiceChangeMap. For example, Add item

• pass <nil, service> as the <previous, current> pair.

Update item

• pass <oldService, service> as the <previous, current> pair.

Delete item

• pass <service, nil> as the <previous, current> pair.

type ServiceEndpoint

type ServiceEndpoint struct {
	Endpoint        string
	ServicePortName ServicePortName
}

ServiceEndpoint is used to identify a service and one of its endpoint pair.

type ServiceMap

type ServiceMap map[ServicePortName]ServicePort

ServiceMap maps a service to its ServicePort.

type ServicePort

type ServicePort interface {
	// String returns service string.  An example format can be: `IP:Port/Protocol`.
	String() string
	// ClusterIPString returns service cluster IP in string format.
	ClusterIPString() string
	// ExternalIPStrings returns service ExternalIPs as a string array.
	ExternalIPStrings() []string
	// LoadBalancerIPStrings returns service LoadBalancerIPs as a string array.
	LoadBalancerIPStrings() []string
	// GetProtocol returns service protocol.
	GetProtocol() v1.Protocol
	// GetHealthCheckNodePort returns service health check node port if present.  If return 0, it means not present.
	GetHealthCheckNodePort() int
	// GetNodePort returns a service Node port if present. If return 0, it means not present.
	GetNodePort() int
}

ServicePort is an interface which abstracts information about a service.

type ServicePortName

type ServicePortName struct {
	types.NamespacedName
	Port string
}

ServicePortName carries a namespace + name + portname. This is the unique identifier for a load-balanced service.

func (ServicePortName) String

func (spn ServicePortName) String() string

type UpdateEndpointMapResult

type UpdateEndpointMapResult struct {
	// HCEndpointsLocalIPSize maps an endpoints name to the length of its local IPs.
	HCEndpointsLocalIPSize map[types.NamespacedName]int
	// StaleEndpoints identifies if an endpoints service pair is stale.
	StaleEndpoints []ServiceEndpoint
	// StaleServiceNames identifies if a service is stale.
	StaleServiceNames []ServicePortName
	// List of the trigger times for all endpoints objects that changed. It's used to export the
	// network programming latency.
	LastChangeTriggerTimes []time.Time
}

UpdateEndpointMapResult is the updated results after applying endpoints changes.

type UpdateServiceMapResult

type UpdateServiceMapResult struct {
	// HCServiceNodePorts is a map of Service names to node port numbers which indicate the health of that Service on this Node.
	// The value(uint16) of HCServices map is the service health check node port.
	HCServiceNodePorts map[types.NamespacedName]uint16
	// UDPStaleClusterIP holds stale (no longer assigned to a Service) Service IPs that had UDP ports.
	// Callers can use this to abort timeout-waits or clear connection-tracking information.
	UDPStaleClusterIP sets.String
}

UpdateServiceMapResult is the updated results after applying service changes.

func UpdateServiceMap

func UpdateServiceMap(serviceMap ServiceMap, changes *ServiceChangeTracker) (result UpdateServiceMapResult)

UpdateServiceMap updates ServiceMap based on the given changes.