health

Documentation

Overview

Package health is a registry for other packages to report & check overall health status of the node.

Index

• Constants
• Variables
• func AppendWarnableDebugFlags(base []string) []string
• func DNSHealth() error
• func DNSOSHealth() error
• func DebugHandler(typ string) http.Handler
• func GetInPollNetMap() bool
• func GotStreamedMapResponse()
• func NoteDERPRegionReceivedFrame(region int)
• func NoteMapRequestHeard(mr *tailcfg.MapRequest)
• func OverallError() error
• func RegisterDebugHandler(typ string, h http.Handler)
• func RegisterWatcher(cb func(key Subsystem, err error)) (unregister func())
• func RouterHealth() error
• func SetAnyInterfaceUp(up bool)
• func SetAuthRoutineInError(err error)
• func SetControlHealth(problems []string)
• func SetDERPRegionConnectedState(region int, connected bool)
• func SetDERPRegionHealth(region int, problem string)
• func SetDNSHealth(err error)
• func SetDNSManagerHealth(err error)
• func SetDNSOSHealth(err error)
• func SetIPNState(state string, wantRunning bool)
• func SetLocalLogConfigHealth(err error)
• func SetMagicSockDERPHome(region int)
• func SetOutOfPollNetMap()
• func SetRouterHealth(err error)
• func SetTKAHealth(err error)
• func SetTLSConnectionError(host string, err error)
• func SetUDP4Unbound(unbound bool)
• func TKAHealth() error
• type ReceiveFuncStats
  • func (s *ReceiveFuncStats) Enter()
  • func (s *ReceiveFuncStats) Exit()
• type Subsystem
• type Warnable
  • func NewWarnable(opts ...WarnableOpt) *Warnable
  • func (w *Warnable) Set(err error)
• type WarnableOpt
  • func WithMapDebugFlag(name string) WarnableOpt

Constants

const (
	// SysOverall is the name representing the overall health of
	// the system, rather than one particular subsystem.
	SysOverall = Subsystem("overall")

	// SysRouter is the name of the wgengine/router subsystem.
	SysRouter = Subsystem("router")

	// SysDNS is the name of the net/dns subsystem.
	SysDNS = Subsystem("dns")

	// SysDNSOS is the name of the net/dns OSConfigurator subsystem.
	SysDNSOS = Subsystem("dns-os")

	// SysDNSManager is the name of the net/dns manager subsystem.
	SysDNSManager = Subsystem("dns-manager")

	// SysTKA is the name of the tailnet key authority subsystem.
	SysTKA = Subsystem("tailnet-lock")
)

Variables

var (
	ReceiveIPv4 = ReceiveFuncStats{/* contains filtered or unexported fields */}
	ReceiveIPv6 = ReceiveFuncStats{/* contains filtered or unexported fields */}
	ReceiveDERP = ReceiveFuncStats{/* contains filtered or unexported fields */}
)

Functions

func AppendWarnableDebugFlags

func AppendWarnableDebugFlags(base []string) []string

AppendWarnableDebugFlags appends to base any health items that are currently in failed state and were created with MapDebugFlag.

func DNSHealth

func DNSHealth() error

DNSHealth returns the net/dns.Manager error state.

func DNSOSHealth

func DNSOSHealth() error

DNSOSHealth returns the net/dns.OSConfigurator error state.

func DebugHandler

func DebugHandler(typ string) http.Handler

func GetInPollNetMap

func GetInPollNetMap() bool

GetInPollNetMap reports whether the client has an open HTTP long poll open to the control plane.

func GotStreamedMapResponse

func GotStreamedMapResponse()

GotStreamedMapResponse notes that we got a tailcfg.MapResponse message in streaming mode, even if it's just a keep-alive message.

This also notes that a map poll is in progress. To unset that, call SetOutOfPollNetMap().

func NoteDERPRegionReceivedFrame

func NoteDERPRegionReceivedFrame(region int)

func NoteMapRequestHeard

func NoteMapRequestHeard(mr *tailcfg.MapRequest)

NoteMapRequestHeard notes whenever we successfully sent a map request to control for which we received a 200 response.

func OverallError

func OverallError() error

OverallError returns a summary of the health state.

If there are multiple problems, the error will be of type multierr.Error.

func RegisterDebugHandler

func RegisterDebugHandler(typ string, h http.Handler)

func RegisterWatcher

func RegisterWatcher(cb func(key Subsystem, err error)) (unregister func())

RegisterWatcher adds a function that will be called if an error changes state either to unhealthy or from unhealthy. It is not called on transition from unknown to healthy. It must be non-nil and is run in its own goroutine. The returned func unregisters it.

func RouterHealth

func RouterHealth() error

RouterHealth returns the wgengine/router.Router error state.

func SetAnyInterfaceUp

func SetAnyInterfaceUp(up bool)

SetAnyInterfaceUp sets whether any network interface is up.

func SetAuthRoutineInError

func SetAuthRoutineInError(err error)

SetAuthRoutineInError records the latest error encountered as a result of a login attempt. Providing a nil error indicates successful login, or that being logged in w/coordination is not currently desired.

func SetControlHealth

func SetControlHealth(problems []string)

func SetDERPRegionConnectedState

func SetDERPRegionConnectedState(region int, connected bool)

func SetDERPRegionHealth

func SetDERPRegionHealth(region int, problem string)

SetDERPRegionHealth sets or clears any problem associated with the provided DERP region.

func SetDNSHealth

func SetDNSHealth(err error)

SetDNSHealth sets the state of the net/dns.Manager

func SetDNSManagerHealth

func SetDNSManagerHealth(err error)

SetDNSManagerHealth sets the state of the Linux net/dns manager's discovery of the /etc/resolv.conf situation.

func SetDNSOSHealth

func SetDNSOSHealth(err error)

SetDNSOSHealth sets the state of the net/dns.OSConfigurator

func SetIPNState

func SetIPNState(state string, wantRunning bool)

state is an ipn.State.String() value: "Running", "Stopped", "NeedsLogin", etc.

func SetLocalLogConfigHealth

func SetLocalLogConfigHealth(err error)

SetLocalLogConfigHealth sets the error state of this client's local log configuration.

func SetMagicSockDERPHome

func SetMagicSockDERPHome(region int)

SetMagicSockDERPHome notes what magicsock's view of its home DERP is.

func SetOutOfPollNetMap

func SetOutOfPollNetMap()

SetOutOfPollNetMap records that the client is no longer in an HTTP map request long poll to the control plane.

func SetRouterHealth

func SetRouterHealth(err error)

SetRouterHealth sets the state of the wgengine/router.Router.

func SetTKAHealth

func SetTKAHealth(err error)

SetTKAHealth sets the health of the tailnet key authority.

func SetTLSConnectionError

func SetTLSConnectionError(host string, err error)

SetTLSConnectionError sets the error state for connections to a specific host. Setting the error to nil will clear any previously-set error.

func SetUDP4Unbound

func SetUDP4Unbound(unbound bool)

SetUDP4Unbound sets whether the udp4 bind failed completely.

func TKAHealth

func TKAHealth() error

TKAHealth returns the tailnet key authority error state.

Types

type ReceiveFuncStats

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

ReceiveFuncStats tracks the calls made to a wireguard-go receive func.

func (*ReceiveFuncStats) Enter

func (s *ReceiveFuncStats) Enter()

func (*ReceiveFuncStats) Exit

func (s *ReceiveFuncStats) Exit()

type Subsystem

type Subsystem string

Subsystem is the name of a subsystem whose health can be monitored.

type Warnable

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

Warnable is a health check item that may or may not be in a bad warning state. The caller of NewWarnable is responsible for calling Set to update the state.

func NewWarnable

func NewWarnable(opts ...WarnableOpt) *Warnable

NewWarnable returns a new warnable item that the caller can mark as health or in warning state.

func (*Warnable) Set

func (w *Warnable) Set(err error)

Set updates the Warnable's state. If non-nil, it's considered unhealthy.

type WarnableOpt

type WarnableOpt interface {
	// contains filtered or unexported methods
}

WarnableOpt is an option passed to NewWarnable.

func WithMapDebugFlag

func WithMapDebugFlag(name string) WarnableOpt

WithMapDebugFlag returns a WarnableOpt for NewWarnable that makes the returned Warnable report itself to the coordination server as broken with this string in MapRequest.DebugFlag when Set to a non-nil value.