converge

package
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 Go to latest Published: Apr 24, 2024 License: Apache-2.0 Imports: 16 Imported by: 0

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Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func NewSafeServiceRestartRunner 

func NewSafeServiceRestartRunner() *safeServiceRestartRunner

func NewSafeServiceShutdownRunner 

func NewSafeServiceShutdownRunner() *safeServiceShutdownRunner

func ServicePackage 

func ServicePackage(convergeState ServiceConvergeState) habpkg.Installable

func UnknownMessageError 

func UnknownMessageError(m message, s state) error

TODO(ssd) 2019-04-21: Should we just panic here? It is a programming error.

Types

type CleanupPhase 

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

CleanupPhase represents the phase responsible for removing services that no longer should be running

func (*CleanupPhase) Name 

func (phase *CleanupPhase) Name() string

Name returns "Cleanup"

func (*CleanupPhase) Run 

func (phase *CleanupPhase) Run(writer *eventWriter) error

Run runs the phase For cleanup phase, that means unloading services that are supervised by Habitat but not marked as running or skip in the desired state.

type Compiler 

type Compiler interface {
	// Compile creates a plan to get to the desired state
	Compile(desiredState DesiredState) (Plan, error)
}

Compiler is an interface that gives back a plan that can be used to converge to a desired state

func NewPhaseOrderedCompiler 

func NewPhaseOrderedCompiler() Compiler

NewPhaseOrderedCompiler returns a PhaseOrderedCompiler

type ConfigureServiceFinished 

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

ConfigureServiceFinished is published when something is installed or fails to install

func (*ConfigureServiceFinished) Error 

func (e *ConfigureServiceFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*ConfigureServiceFinished) Modified 

func (e *ConfigureServiceFinished) Modified() bool

Modified returns true if the package was installed

func (*ConfigureServiceFinished) Name 

func (*ConfigureServiceFinished) Name() string

Name returns the event name. Used for logging

func (*ConfigureServiceFinished) Pkg 

func (e *ConfigureServiceFinished) Pkg() habpkg.Installable

Pkg returns the package this event is about

type ConfigureServiceStarted 

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

ConfigureServiceStarted is published when a package is about to be installed

func (*ConfigureServiceStarted) Name 

func (*ConfigureServiceStarted) Name() string

Name returns the event name. Used for logging

func (*ConfigureServiceStarted) Pkg 

func (e *ConfigureServiceStarted) Pkg() habpkg.Installable

Pkg returns the package this event is about

type ConfigureSystemdFinished 

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

ConfigureSystemdFinished is published when the systemd configuration has been written to disk or when an error has occurred attempting to write the configuration to disk.

func (*ConfigureSystemdFinished) Error 

func (e *ConfigureSystemdFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*ConfigureSystemdFinished) Modified 

func (e *ConfigureSystemdFinished) Modified() bool

Modified returns true if the package was installed

func (*ConfigureSystemdFinished) Name 

func (*ConfigureSystemdFinished) Name() string

Name returns the event name. Used for logging

type ConfigureSystemdStarted 

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

ConfigureSystemdStarted is published when the systemd configuration is about to be rendered and written to disk.

func (*ConfigureSystemdStarted) Name 

func (*ConfigureSystemdStarted) Name() string

Name returns the event name. Used for logging

type Converger 

type Converger interface {
	Converge(*Task, DesiredState, EventSink) error
	StopServices(*Task, target.Target, EventSink) error
	PrepareForShutdown(*Task, target.Target, EventSink) error

	// Stop() stops the Converger, not the deployment-service or
	// any other Automate services.
	Stop()
}

A Converger mutates the underlying system in response to system events and user commands. TODO(ssd) 2019-04-22: new name??

func StartConverger 

func StartConverger(opts ...ConvergerOpt) Converger

StartConverger starts a converger. Options may be provided to override default values for the compiler and inbox size. NOTE: A Converger runs in a goroutine, and this function launches it

type ConvergerFinished 

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

ConvergerFinished is an event that is published when the converger finishes working on a converge request

func (*ConvergerFinished) Error 

func (e *ConvergerFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*ConvergerFinished) Name 

func (*ConvergerFinished) Name() string

Name returns the event name. Used for logging

type ConvergerOpt 

type ConvergerOpt func(*converger)

ConvergerOpt represents a configuration for converger

func WithCompiler 

func WithCompiler(compiler Compiler) ConvergerOpt

WithCompiler sets the compiler to use when fulfilling a converge request. By default, we will use the PhaseOrderedCompiler. Specifying a compiler is useful in unit testing

func WithDebugChannel 

func WithDebugChannel() ConvergerOpt

WithDebugChannel enables the debug channel used in testing to poll the state of the converger. By default this is a nil channel.

NOTE(ssd) 2019-04-22: Ideally I think these messages would also be sent via the inbox, but I'm a chicken.

func WithMaxInboxSize 

func WithMaxInboxSize(size int) ConvergerOpt

WithMaxInboxSize sets the maximum backlog for converge requests. Converge requests surpassing the backlog will return an error

type ConvergerStarted 

type ConvergerStarted struct {
}

ConvergerStarted is an event that is published when the converger starts working on a converge request

func (*ConvergerStarted) Name 

func (*ConvergerStarted) Name() string

Name returns the event name. Used for logging

type DesiredState 

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

DesiredState is the desired state we wish to put our targets in. Each target will have services in a certain state.

func NewDesiredState 

func NewDesiredState(topology Topology, supervisor SupervisorState, ignoredPackages []habpkg.HabPkg, packageCleanupMode string) DesiredState

NewDesiredState creates a DesiredState from a topology and supervisor

type Event 

type Event interface {
	Name() string
	// contains filtered or unexported methods
}

Event is a type that can published to the EventSink

type EventSink 

type EventSink interface {
	Sink(Event)
}

EventSink is something that can receive converge events

type HabPackageInstallFinished 

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

HabPackageInstallFinished is published when a package is installed or fails to install, unrelated to a service.

func (*HabPackageInstallFinished) Error 

func (e *HabPackageInstallFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*HabPackageInstallFinished) Modified 

func (e *HabPackageInstallFinished) Modified() bool

Modified returns true if the package was installed

func (*HabPackageInstallFinished) Name 

func (*HabPackageInstallFinished) Name() string

Name returns the event name. Used for logging

func (*HabPackageInstallFinished) Pkg 

func (e *HabPackageInstallFinished) Pkg() habpkg.Installable

Pkg returns the package this event is about

type HabPackageInstallStarted 

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

HabPackageInstallStarted is published when a package is about to be installed unrelated to a service.

func (*HabPackageInstallStarted) Name 

func (*HabPackageInstallStarted) Name() string

Name returns the event name. Used for logging

func (*HabPackageInstallStarted) Pkg 

func (e *HabPackageInstallStarted) Pkg() habpkg.Installable

Pkg returns the package this event is about

type InstallPhase 

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

InstallPhase represents the steps to execute during the install phase

func (*InstallPhase) Name 

func (phase *InstallPhase) Name() string

Name returns "install"

func (*InstallPhase) Run 

func (phase *InstallPhase) Run(writer *eventWriter) error

Run runs the phase For the install phase, this means installing hartifacts and packages that are not installed.

type InstallServiceFinished 

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

InstallServiceFinished is published when something is installed or fails to install

func (*InstallServiceFinished) Error 

func (e *InstallServiceFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*InstallServiceFinished) Modified 

func (e *InstallServiceFinished) Modified() bool

Modified returns true if the package was installed

func (*InstallServiceFinished) Name 

func (*InstallServiceFinished) Name() string

Name returns the event name. Used for logging

func (*InstallServiceFinished) Pkg 

func (e *InstallServiceFinished) Pkg() habpkg.Installable

Pkg returns the package this event is about

type InstallServiceStarted 

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

InstallServiceStarted is published when a package is about to be installed

func (*InstallServiceStarted) Name 

func (*InstallServiceStarted) Name() string

Name returns the event name. Used for logging

func (*InstallServiceStarted) Pkg 

func (e *InstallServiceStarted) Pkg() habpkg.Installable

Pkg returns the package this event is about

type Phase 

type Phase interface {
	Run(*eventWriter) error
	Name() string
}

Phase represents an execution phase for the PhaseOrderedProgram TODO(jaym) this type should not be exported

type PhaseOrderedCompiler 

type PhaseOrderedCompiler struct {
}

PhaseOrderedCompiler is a compiler that will take a desired state and return a plan that achieves that desired state by working in phases.

func (*PhaseOrderedCompiler) Compile 

func (c *PhaseOrderedCompiler) Compile(desiredState DesiredState) (Plan, error)

Compile creates a plan to get to the desired state

type PhaseOrderedProgram 

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

PhaseOrderedProgram is a plan returned by the PhaseOrderedCompiler It will install the desired packages, configure the services, run the services, and remove any services that are no longer needed TODO(jaym) this type should not be exported

func (*PhaseOrderedProgram) Execute 

func (p *PhaseOrderedProgram) Execute(eventSink EventSink) error

Execute executes the plan to get to the desired state

type Plan 

type Plan interface {
	// Execute executes the plan to get to the desired state
	Execute(EventSink) error
}

Plan is a plan to execute that will bring us to a desired state

type ReloadSystemdFinished 

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

ReloadSystemdFinished is published when the systemd daemon has been reloaded or an error has occurred attempting to reload it.

func (*ReloadSystemdFinished) Error 

func (e *ReloadSystemdFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*ReloadSystemdFinished) Modified 

func (e *ReloadSystemdFinished) Modified() bool

Modified returns true if the package was installed

func (*ReloadSystemdFinished) Name 

func (*ReloadSystemdFinished) Name() string

Name returns the event name. Used for logging

type ReloadSystemdStarted 

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

ReloadSystemdStarted is published when the system deamon is about to be reloaded.

func (*ReloadSystemdStarted) Name 

func (*ReloadSystemdStarted) Name() string

Name returns the event name. Used for logging

type RestartHabSupFinished 

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

RestartHabSupFinished is published when the systemd daemon has been reloaded or an error has occurred attempting to reload it.

func (*RestartHabSupFinished) Error 

func (e *RestartHabSupFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*RestartHabSupFinished) Modified 

func (e *RestartHabSupFinished) Modified() bool

Modified returns true if the package was installed

func (*RestartHabSupFinished) Name 

func (*RestartHabSupFinished) Name() string

Name returns the event name. Used for logging

type RestartHabSupStarted 

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

RestartHabSupStarted is published when the system deamon is about to be reloaded.

func (*RestartHabSupStarted) Name 

func (*RestartHabSupStarted) Name() string

Name returns the event name. Used for logging

type RunServiceFinished 

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

RunServiceFinished is published when something is installed or fails to install

func (*RunServiceFinished) Error 

func (e *RunServiceFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*RunServiceFinished) Modified 

func (e *RunServiceFinished) Modified() bool

Modified returns true if the package was installed

func (*RunServiceFinished) Name 

func (*RunServiceFinished) Name() string

Name returns the event name. Used for logging

func (*RunServiceFinished) Pkg 

func (e *RunServiceFinished) Pkg() habpkg.Installable

Pkg returns the package this event is about

type RunServiceStarted 

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

RunServiceStarted is published when a package is about to be installed

func (*RunServiceStarted) Name 

func (*RunServiceStarted) Name() string

Name returns the event name. Used for logging

func (*RunServiceStarted) Pkg 

func (e *RunServiceStarted) Pkg() habpkg.Installable

Pkg returns the package this event is about

type RunningOption 

type RunningOption func(r *running)

func BindMode 

func BindMode(m string) RunningOption

func Binds 

func Binds(b []string) RunningOption

func UserTOML 

func UserTOML(t string) RunningOption

type RunningPhase 

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

RunningPhase represents the phase that gets services running

func (*RunningPhase) Name 

func (phase *RunningPhase) Name() string

Name returns "Running"

func (*RunningPhase) Run 

func (phase *RunningPhase) Run(writer *eventWriter) error

RunningPhase ensures that the correct version of a service is loaded with the correct configuration.

type SelfConfigurePhase 

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

SelfConfigurePhase describes a phase to configure the deployment service

func (*SelfConfigurePhase) Name 

func (phase *SelfConfigurePhase) Name() string

Name returns "Configure"

func (*SelfConfigurePhase) Run 

func (phase *SelfConfigurePhase) Run(writer *eventWriter) error

Run the self-configuration phase for the deployment. This means checking if the user toml for the deployment service has changed and writing it out to disk if it has. If we write out the configuration, we also write a sentinel file to ensure we don't proceed past this part of the converge process until the reconfiguration has been processed.

type SelfUpgradePhase 

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

SelfUpgradePhase describes a phase to upgrade the deployment service

func (*SelfUpgradePhase) Name 

func (phase *SelfUpgradePhase) Name() string

Name returns "install"

func (*SelfUpgradePhase) Run 

func (phase *SelfUpgradePhase) Run(writer *eventWriter) error

Run the self upgrade phase.

type Service 

type Service struct {
	Name          string
	ConvergeState ServiceConvergeState
}

Service is a representation of a package and the state we want it in

type ServiceConvergeState 

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

ServiceConvergeState is the desired state for an individual service

func Installed 

func Installed(pkg habpkg.Installable) ServiceConvergeState

Installed is a ConvergeState that means we should install hab package. The VersionConstraint specified describes options for installation, such as to do it from a hart

func Running 

func Running(pkg habpkg.Installable, opts ...RunningOption) ServiceConvergeState

Running is a ConvergeState that means the service should be installed, configured and supervised by hab

func Skip 

func Skip() ServiceConvergeState

Skip is a ConvergeState that means we should do nothing to put the service in any particular state

type ServiceEvent 

type ServiceEvent interface {
	Event

	Pkg() habpkg.Installable
	// contains filtered or unexported methods
}

ServiceEvent is an event that has a package

type ServiceFinishEvent 

type ServiceFinishEvent interface {
	ServiceEvent
	Error() error
	Modified() bool
	// contains filtered or unexported methods
}

ServiceFinishEvent is an interface describing something that finished about the service

type ServiceStartEvent 

type ServiceStartEvent interface {
	ServiceEvent
	// contains filtered or unexported methods
}

ServiceStartEvent is an interface describing something that is starting about the service

type SupervisorState 

type SupervisorState interface {
	IsSkip() bool
	SupPkg() habpkg.HabPkg
	BinPkg() habpkg.HabPkg
	LauncherPkg() habpkg.HabPkg
	ProxyConfig() string
}

SupervisorState represents the desired state of the Habitat supervisor, including its integration with systemd.

func NewSkipSupervisorState 

func NewSkipSupervisorState() SupervisorState

func NewSupervisorState 

func NewSupervisorState(supPkg habpkg.HabPkg, binPkg habpkg.HabPkg,
	launcherPkg habpkg.HabPkg, proxyConfig string) SupervisorState

type SupervisorUpgradeEvent 

type SupervisorUpgradeEvent interface {
	Event
	// contains filtered or unexported methods
}

SupervisorUpgradeEvent is an event related to updating hab-sup and systemd

type SupervisorUpgradeFinishEvent 

type SupervisorUpgradeFinishEvent interface {
	SupervisorUpgradeEvent
	Error() error
	Modified() bool
	// contains filtered or unexported methods
}

SupervisorUpgradeFinishEvent is a completed or failed event related to updating hab-sup and systemd

type SupervisorUpgradePhase 

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

SupervisorUpgradePhase describes a phase to configure (and potentially restart) the Habitat Supervisor

func (*SupervisorUpgradePhase) Name 

func (phase *SupervisorUpgradePhase) Name() string

func (*SupervisorUpgradePhase) Run 

func (phase *SupervisorUpgradePhase) Run(w *eventWriter) error

type SupervisorUpgradeStartEvent 

type SupervisorUpgradeStartEvent interface {
	SupervisorUpgradeEvent
	// contains filtered or unexported methods
}

SupervisorUpgradeStartEvent is the start of an event related to updating hab-sup and systemd

type Task 

type Task struct {
	ID uuid.UUID
	// C will receive a message when the task is done
	C chan error
}

Task is a future like object that will receive a message once the requested task has been completed

func NewTask 

func NewTask() (*Task, error)

NewTask returns a Task which can be passed to the Converge() function. The Task is used to identify and signal completion of the requested converge.

type Topology 

type Topology map[target.Target][]Service

Topology represents our targets and the services that run on them

type UnloadServiceFinished 

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

UnloadServiceFinished is published when something is installed or fails to install

func (*UnloadServiceFinished) Error 

func (e *UnloadServiceFinished) Error() error

Error returns the error if the install errored, nil otherwise

func (*UnloadServiceFinished) Modified 

func (e *UnloadServiceFinished) Modified() bool

Modified returns true if the package was installed

func (*UnloadServiceFinished) Name 

func (*UnloadServiceFinished) Name() string

Name returns the event name. Used for logging

func (*UnloadServiceFinished) Pkg 

func (e *UnloadServiceFinished) Pkg() habpkg.Installable

Pkg returns the package this event is about

type UnloadServiceStarted 

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

UnloadServiceStarted is published when a package is about to be installed

func (*UnloadServiceStarted) Name 

func (*UnloadServiceStarted) Name() string

Name returns the event name. Used for logging

func (*UnloadServiceStarted) Pkg 

func (e *UnloadServiceStarted) Pkg() habpkg.Installable

Pkg returns the package this event is about

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