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 Go to latest Published: Jul 30, 2020 License: MPL-2.0 Imports: 17 Imported by: 76

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Variables

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Functions

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Types

type CheckState 

type CheckState struct {
	// Check is the local copy of the health check record.
	//
	// Must Clone() the overall CheckState before mutating this. After mutation
	// reinstall into the checks map.
	Check *structs.HealthCheck

	// Token is the ACL record to update or delete the health check
	// record on the server.
	Token string

	// CriticalTime is the last time the health check status went
	// from non-critical to critical. When the health check is not
	// in critical state the value is the zero value.
	CriticalTime time.Time

	// DeferCheck is used to delay the sync of a health check when
	// only the output has changed. This rate limits changes which
	// do not affect the state of the node and/or service.
	DeferCheck *time.Timer

	// InSync contains whether the local state of the health check
	// record is in sync with the remote state on the server.
	InSync bool

	// Deleted is true when the health check record has been marked as
	// deleted but has not been removed on the server yet.
	Deleted bool
}

CheckState describes the state of a health check record.

func (*CheckState) Clone 

func (c *CheckState) Clone() *CheckState

Clone returns a shallow copy of the object.

The defer timer still points to the original value and must not be modified.

func (*CheckState) Critical 

func (c *CheckState) Critical() bool

Critical returns true when the health check is in critical state.

func (*CheckState) CriticalFor 

func (c *CheckState) CriticalFor() time.Duration

CriticalFor returns the amount of time the service has been in critical state. Its value is undefined when the service is not in critical state.

type Config 

type Config struct {
	AdvertiseAddr       string
	CheckUpdateInterval time.Duration
	Datacenter          string
	DiscardCheckOutput  bool
	NodeID              types.NodeID
	NodeName            string
	TaggedAddresses     map[string]string
}

Config is the configuration for the State.

type ServiceState 

type ServiceState struct {
	// Service is the local copy of the service record.
	Service *structs.NodeService

	// Token is the ACL to update or delete the service record on the
	// server.
	Token string

	// InSync contains whether the local state of the service record
	// is in sync with the remote state on the server.
	InSync bool

	// Deleted is true when the service record has been marked as deleted
	// but has not been removed on the server yet.
	Deleted bool

	// WatchCh is closed when the service state changes. Suitable for use in a
	// memdb.WatchSet when watching agent local changes with hash-based blocking.
	WatchCh chan struct{}
}

ServiceState describes the state of a service record.

func (*ServiceState) Clone 

func (s *ServiceState) Clone() *ServiceState

Clone returns a shallow copy of the object. The service record still points to the original service record and must not be modified. The WatchCh is also still pointing to the original so the clone will be update when the original is.

type State 

type State struct {
	sync.RWMutex

	// Delegate the RPC interface to the consul server or agent.
	//
	// It is set after both the state and the consul server/agent have
	// been created.
	Delegate rpc

	// TriggerSyncChanges is used to notify the state syncer that a
	// partial sync should be performed.
	//
	// It is set after both the state and the state syncer have been
	// created.
	TriggerSyncChanges func()
	// contains filtered or unexported fields
}

State is used to represent the node's services, and checks. We use it to perform anti-entropy with the catalog representation

func NewState 

func NewState(c Config, lg *log.Logger, tokens *token.Store) *State

NewState creates a new local state for the agent.

func TestState added in v1.2.0 

func TestState(t testing.T) *State

TestState returns a configured *State for testing.

func (*State) AddAliasCheck added in v1.2.2 

func (l *State) AddAliasCheck(checkID types.CheckID, srcServiceID string, notifyCh chan<- struct{}) error

AddAliasCheck creates an alias check. When any check for the srcServiceID is changed, checkID will reflect that using the same semantics as checks.CheckAlias.

This is a local optimization so that the Alias check doesn't need to use blocking queries against the remote server for check updates for local services.

func (*State) AddCheck 

func (l *State) AddCheck(check *structs.HealthCheck, token string) error

AddCheck is used to add a health check to the local state. This entry is persistent and the agent will make a best effort to ensure it is registered

func (*State) AddService 

func (l *State) AddService(service *structs.NodeService, token string) error

AddService is used to add a service entry to the local state. This entry is persistent and the agent will make a best effort to ensure it is registered

func (*State) AddServiceWithChecks added in v1.4.3 

func (l *State) AddServiceWithChecks(service *structs.NodeService, checks []*structs.HealthCheck, token string) error

AddServiceWithChecks adds a service and its check tp the local state atomically

func (*State) Check 

func (l *State) Check(id types.CheckID) *structs.HealthCheck

Check returns the locally registered check that the agent is aware of and are being kept in sync with the server

func (*State) CheckState 

func (l *State) CheckState(id types.CheckID) *CheckState

CheckState returns a shallow copy of the current health check state record.

The defer timer still points to the original value and must not be modified.

func (*State) CheckStates 

func (l *State) CheckStates() map[types.CheckID]*CheckState

CheckStates returns a shallow copy of all health check state records. The map contains a shallow copy of the current check states.

The defer timers still point to the original values and must not be modified.

func (*State) CheckToken 

func (l *State) CheckToken(checkID types.CheckID) string

CheckToken is used to return the configured health check token for a Check, or if none is configured, the default agent ACL token.

func (*State) Checks 

func (l *State) Checks() map[types.CheckID]*structs.HealthCheck

Checks returns the locally registered checks that the agent is aware of and are being kept in sync with the server

func (*State) CriticalCheckStates 

func (l *State) CriticalCheckStates() map[types.CheckID]*CheckState

CriticalCheckStates returns the locally registered checks that the agent is aware of and are being kept in sync with the server. The map contains a shallow copy of the current check states.

The defer timers still point to the original values and must not be modified.

func (*State) LoadMetadata 

func (l *State) LoadMetadata(data map[string]string) error

LoadMetadata loads node metadata fields from the agent config and updates them on the local agent.

func (*State) Metadata 

func (l *State) Metadata() map[string]string

Metadata returns the local node metadata fields that the agent is aware of and are being kept in sync with the server

func (*State) Notify added in v1.3.0 

func (l *State) Notify(ch chan<- struct{})

Notify will register a channel to receive messages when the local state changes. Only service add/remove are supported for now. See notes on l.notifyHandlers for more details.

This will not block on channel send so ensure the channel has a buffer. Note that any buffer size is generally fine since actual data is not sent over the channel, so a dropped send due to a full buffer does not result in any loss of data. The fact that a buffer already contains a notification means that the receiver will still be notified that changes occurred.

func (*State) RemoveAliasCheck added in v1.2.2 

func (l *State) RemoveAliasCheck(checkID types.CheckID, srcServiceID string)

RemoveAliasCheck removes the mapping for the alias check.

func (*State) RemoveCheck 

func (l *State) RemoveCheck(id types.CheckID) error

RemoveCheck is used to remove a health check from the local state. The agent will make a best effort to ensure it is deregistered todo(fs): RemoveService returns an error for a non-existent service. RemoveCheck should as well. todo(fs): Check code that calls this to handle the error.

func (*State) RemoveService 

func (l *State) RemoveService(id string) error

RemoveService is used to remove a service entry from the local state. The agent will make a best effort to ensure it is deregistered.

func (*State) RemoveServiceWithChecks added in v1.4.3 

func (l *State) RemoveServiceWithChecks(serviceID string, checkIDs []types.CheckID) error

RemoveServiceWithChecks removes a service and its check from the local state atomically

func (*State) Service 

func (l *State) Service(id string) *structs.NodeService

Service returns the locally registered service that the agent is aware of and are being kept in sync with the server

func (*State) ServiceState 

func (l *State) ServiceState(id string) *ServiceState

ServiceState returns a shallow copy of the current service state record. The service record still points to the original service record and must not be modified. The WatchCh for the copy returned will also be closed when the actual service state is changed.

func (*State) ServiceStates 

func (l *State) ServiceStates() map[string]*ServiceState

ServiceStates returns a shallow copy of all service state records. The service record still points to the original service record and must not be modified.

func (*State) ServiceToken 

func (l *State) ServiceToken(id string) string

ServiceToken returns the configured ACL token for the given service ID. If none is present, the agent's token is returned.

func (*State) Services 

func (l *State) Services() map[string]*structs.NodeService

Services returns the locally registered services that the agent is aware of and are being kept in sync with the server

func (*State) SetCheckState 

func (l *State) SetCheckState(c *CheckState)

SetCheckState is used to overwrite a raw check state with the given state. This method is safe to be called concurrently but should only be used during testing. You should most likely call AddCheck instead.

func (*State) SetDiscardCheckOutput 

func (l *State) SetDiscardCheckOutput(b bool)

SetDiscardCheckOutput configures whether the check output is discarded. This can be changed at runtime.

func (*State) SetServiceState 

func (l *State) SetServiceState(s *ServiceState)

SetServiceState is used to overwrite a raw service state with the given state. This method is safe to be called concurrently but should only be used during testing. You should most likely call AddService instead.

func (*State) Stats 

func (l *State) Stats() map[string]string

Stats is used to get various debugging state from the sub-systems

func (*State) StopNotify added in v1.3.0 

func (l *State) StopNotify(ch chan<- struct{})

StopNotify will deregister a channel receiving state change notifications. Pair this with all calls to Notify to clean up state.

func (*State) SyncChanges 

func (l *State) SyncChanges() error

SyncChanges pushes checks, services and node info data which has been marked out of sync or deleted to the server.

func (*State) SyncFull 

func (l *State) SyncFull() error

SyncFull determines the delta between the local and remote state and synchronizes the changes.

func (*State) UnloadMetadata 

func (l *State) UnloadMetadata()

UnloadMetadata resets the local metadata state

func (*State) UpdateCheck 

func (l *State) UpdateCheck(id types.CheckID, status, output string)

UpdateCheck is used to update the status of a check

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