service

package
v1.15.4 Latest Latest
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 Go to latest Published: Apr 11, 2024 License: Apache-2.0 Imports: 35 Imported by: 15

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Index

Constants

View Source 
const (
	// FirstFreeServiceID is the first ID for which the services should be assigned.
	FirstFreeServiceID = uint32(1)

	// MaxSetOfServiceID is maximum number of set of service IDs that can be stored
	// in the kvstore or the local ID allocator.
	MaxSetOfServiceID = uint32(0xFFFF)

	// FirstFreeBackendID is the first ID for which the backend should be assigned.
	// BPF datapath assumes that backend_id cannot be 0.
	FirstFreeBackendID = uint32(1)

	// MaxSetOfBackendID is maximum number of set of backendIDs IDs that can be
	// stored in the local ID allocator.
	MaxSetOfBackendID = uint32(0xFFFFFFFF)
)

Variables

View Source 
var Cell = cell.Module(
	"service-manager",
	"Service Manager",

	cell.Provide(newServiceManager),
)

Cell provides access to the Service Manager.

Functions

func AcquireBackendID 

func AcquireBackendID(l3n4Addr loadbalancer.L3n4Addr) (loadbalancer.BackendID, error)

AcquireBackendID acquires a new local ID for the given backend.

func AcquireID 

func AcquireID(l3n4Addr loadbalancer.L3n4Addr, baseID uint32) (*loadbalancer.L3n4AddrID, error)

AcquireID acquires a service ID

func DeleteBackendID 

func DeleteBackendID(id loadbalancer.BackendID)

DeleteBackendID releases the given backend ID. TODO(brb) maybe provide l3n4Addr as an arg for the extra safety.

func DeleteID 

func DeleteID(id uint32) error

DeleteID deletes the L3n4AddrID belonging to the given id from the kvstore.

func GetID 

func GetID(id uint32) (*loadbalancer.L3n4AddrID, error)

GetID returns the L3n4AddrID that belongs to the given id.

func LookupBackendID 

func LookupBackendID(l3n4Addr loadbalancer.L3n4Addr) (loadbalancer.BackendID, error)

LookupBackendID looks up already allocated backend ID for the given backend addr. If such cannot be found, returns an error.

func NewErrLocalRedirectServiceExists 

func NewErrLocalRedirectServiceExists(frontend lb.L3n4AddrID, name lb.ServiceName) error

NewErrLocalRedirectServiceExists returns a new ErrLocalRedirectServiceExists

func RestoreBackendID 

func RestoreBackendID(l3n4Addr loadbalancer.L3n4Addr, id loadbalancer.BackendID) error

RestoreBackendID tries to restore the given local ID for the given backend.

If ID cannot be restored (ID already taken), returns an error.

func RestoreID 

func RestoreID(l3n4Addr loadbalancer.L3n4Addr, baseID uint32) (*loadbalancer.L3n4AddrID, error)

RestoreID restores previously used service ID

Types

type ErrLocalRedirectServiceExists 

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

ErrLocalRedirectServiceExists represents an error when a Local redirect service exists with the same Frontend.

func (ErrLocalRedirectServiceExists) Error 

func (e ErrLocalRedirectServiceExists) Error() string

func (*ErrLocalRedirectServiceExists) Is 

func (e *ErrLocalRedirectServiceExists) Is(target error) bool

type IDAllocator 

type IDAllocator struct {
	// Protects entitiesID, entities, nextID and maxID
	lock.RWMutex
	// contains filtered or unexported fields
}

IDAllocator contains an internal state of the ID allocator.

func NewIDAllocator 

func NewIDAllocator(nextID uint32, maxID uint32) *IDAllocator

NewIDAllocator creates a new ID allocator instance.

type L7LBInfo 

type L7LBInfo struct {
	// contains filtered or unexported fields
}

func (*L7LBInfo) AllFrontendPorts added in v1.15.0 

func (r *L7LBInfo) AllFrontendPorts() []string

AllFrontendPorts returns all frontend ports of the service that are referenced by all envoy backend references (CEC).

type L7LBSyncInfo added in v1.15.0 

type L7LBSyncInfo struct {
	// contains filtered or unexported fields
}

type NodeMetaCollector 

type NodeMetaCollector interface {
	GetIPv4() net.IP
	GetIPv6() net.IP
}

type Service 

type Service struct {
	lock.RWMutex
	// contains filtered or unexported fields
}

Service is a service handler. Its main responsibility is to reflect service-related changes into BPF maps used by datapath BPF programs. The changes can be triggered either by k8s_watcher or directly by API calls to the /services endpoint.

func NewService 

func NewService(monitorAgent monitorAgent.Agent, envoyCache envoyCache, lbmap datapathTypes.LBMap) *Service

NewService creates a new instance of the service handler.

func (*Service) DeleteService 

func (s *Service) DeleteService(frontend lb.L3n4Addr) (bool, error)

DeleteService removes the given service.

func (*Service) DeleteServiceByID 

func (s *Service) DeleteServiceByID(id lb.ServiceID) (bool, error)

DeleteServiceByID removes a service identified by the given ID.

func (*Service) GetCurrentTs 

func (s *Service) GetCurrentTs() time.Time

func (*Service) GetDeepCopyServiceByFrontend 

func (s *Service) GetDeepCopyServiceByFrontend(frontend lb.L3n4Addr) (*lb.SVC, bool)

GetDeepCopyServiceByFrontend returns a deep-copy of the service that matches the Frontend address.

func (*Service) GetDeepCopyServiceByID 

func (s *Service) GetDeepCopyServiceByID(id lb.ServiceID) (*lb.SVC, bool)

GetDeepCopyServiceByID returns a deep-copy of a service identified with the given ID.

If a service cannot be found, returns false.

func (*Service) GetDeepCopyServices 

func (s *Service) GetDeepCopyServices() []*lb.SVC

GetDeepCopyServices returns a deep-copy of all installed services.

func (*Service) GetLastUpdatedTs 

func (s *Service) GetLastUpdatedTs() time.Time

func (*Service) GetServiceNameByAddr 

func (s *Service) GetServiceNameByAddr(addr lb.L3n4Addr) (string, string, bool)

GetServiceNameByAddr returns namespace and name of the service with a given L3n4Addr. The third return value is set to true if and only if the service is found in the map.

func (*Service) InitMaps 

func (s *Service) InitMaps(ipv6, ipv4, sockMaps, restore bool) error

InitMaps opens or creates BPF maps used by services.

If restore is set to false, entries of the maps are removed.

func (*Service) RegisterL7LBService 

func (s *Service) RegisterL7LBService(serviceName, resourceName lb.ServiceName, ports []string, proxyPort uint16) error

RegisterL7LBService makes the given service to be locally forwarded to the given proxy port.

func (*Service) RegisterL7LBServiceBackendSync 

func (s *Service) RegisterL7LBServiceBackendSync(serviceName, resourceName lb.ServiceName, ports []string) error

RegisterL7LBServiceBackendSync synchronizes the backends of a service to Envoy.

func (*Service) RemoveL7LBService 

func (s *Service) RemoveL7LBService(serviceName, resourceName lb.ServiceName) error

func (*Service) RestoreServices 

func (s *Service) RestoreServices() error

RestoreServices restores services from BPF maps.

It first restores all the service entries, followed by backend entries. In the process, it deletes any duplicate backend entries that were leaked, and are not referenced by any service entries.

The method should be called once before establishing a connectivity to kube-apiserver.

func (*Service) SyncServicesOnDeviceChange 

func (s *Service) SyncServicesOnDeviceChange(nodeAddressing types.NodeAddressing)

SyncServicesOnDeviceChange finds and adds missing load-balancing entries for new devices.

func (*Service) SyncWithK8sFinished 

func (s *Service) SyncWithK8sFinished(localOnly bool, localServices sets.Set[k8s.ServiceID]) (stale []k8s.ServiceID, err error)

SyncWithK8sFinished removes services which we haven't heard about during a sync period of cilium-agent's k8s service cache.

The removal is based on an assumption that during the sync period UpsertService() is going to be called for each alive service.

Additionally, it returns a list of services which are associated with stale backends, and which shall be refreshed. Stale services shall be refreshed regardless of whether an error is also returned or not.

The localOnly flag allows to perform a two pass removal, handling local services first, and processing global ones only after full synchronization with all remote clusters.

func (*Service) UpdateBackendsState 

func (s *Service) UpdateBackendsState(backends []*lb.Backend) error

UpdateBackendsState updates all the service(s) with the updated state of the given backends. It also persists the updated backend states to the BPF maps.

Backend state transitions are validated before processing.

In case of duplicated backends in the list, the state will be updated to the last duplicate entry.

func (*Service) UpsertService 

func (s *Service) UpsertService(params *lb.SVC) (bool, lb.ID, error)

UpsertService inserts or updates the given service.

The first return value is true if the service hasn't existed before.

type ServiceManager added in v1.15.0 

type ServiceManager interface {
	// DeleteService removes the given service.
	DeleteService(frontend lb.L3n4Addr) (bool, error)

	// DeleteServiceByID removes a service identified by the given ID.
	DeleteServiceByID(id lb.ServiceID) (bool, error)

	// GetCurrentTs retrieves the current timestamp.
	GetCurrentTs() time.Time

	// GetDeepCopyServices returns a deep-copy of all installed services.
	GetDeepCopyServices() []*lb.SVC

	// GetDeepCopyServiceByFrontend returns a deep-copy of the service that matches the Frontend address.
	GetDeepCopyServiceByFrontend(frontend lb.L3n4Addr) (*lb.SVC, bool)

	// GetDeepCopyServiceByID returns a deep-copy of a service identified with the given ID.
	GetDeepCopyServiceByID(id lb.ServiceID) (*lb.SVC, bool)

	// GetLastUpdatedTs retrieves the last updated timestamp.
	GetLastUpdatedTs() time.Time

	// GetServiceNameByAddr looks up service by IP/port. Hubble uses this function
	// to annotate flows with service information.
	GetServiceNameByAddr(addr lb.L3n4Addr) (string, string, bool)

	// InitMaps opens or creates BPF maps used by services.
	InitMaps(ipv6, ipv4, sockMaps, restore bool) error

	// RegisterL7LBService makes the given service to be locally forwarded to th given proxy port.
	RegisterL7LBService(serviceName, resourceName lb.ServiceName, ports []string, proxyPort uint16) error

	// RegisterL7LBServiceBackendSync synchronizes the backends of a service to Envoy.
	RegisterL7LBServiceBackendSync(serviceName, resourceName lb.ServiceName, ports []string) error

	// RemoveL7LBService removes a service from L7 load balancing.
	RemoveL7LBService(serviceName, resourceName lb.ServiceName) error

	// RestoreServices restores services from BPF maps.
	RestoreServices() error

	// SyncServicesOnDeviceChange finds and adds missing load-balancing entries for new devices.
	SyncServicesOnDeviceChange(nodeAddressing types.NodeAddressing)

	// SyncWithK8sFinished removes services which we haven't heard about during
	// a sync period of cilium-agent's k8s service cache.
	SyncWithK8sFinished(localOnly bool, localServices sets.Set[k8s.ServiceID]) (stale []k8s.ServiceID, err error)

	// UpdateBackendsState updates all the service(s) with the updated state of
	// the given backends. It also persists the updated backend states to the BPF maps.
	UpdateBackendsState(backends []*lb.Backend) error

	// UpsertService inserts or updates the given service.
	UpsertService(*lb.SVC) (bool, lb.ID, error)
}

ServiceManager provides an interface for service related operations. It is implemented by service handler which main responsibility is to reflect service-related changes into BPF maps used by datapath BPF programs.

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