daemon

package
v2.3.1+incompatible Latest Latest
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 Go to latest Published: Feb 7, 2018 License: GPL-3.0 Imports: 22 Imported by: 1

Documentation

Index

Constants

View Source 
const (
	DriverBinary      = "/opt/driver/bin/driver"
	GRPCSocket        = "rpc.sock"
	TmpPathPattern    = "/tmp/%s"
	ConnectionTimeout = 5 * time.Second
)
View Source 
const (
	// DefaultPoolTimeout is the time a request to the DriverPool can wait
	// before getting a driver assigned.
	DefaultPoolTimeout = 5 * time.Second
	// MaxPoolTimeout maximum time allowed to wait for a driver be assigned.
	MaxPoolTimeout = 5 * time.Minute
)

Variables

View Source 
var (
	ErrUnexpected        = errors.NewKind("unexpected error")
	ErrMissingDriver     = errors.NewKind("missing driver for language %q")
	ErrRuntime           = errors.NewKind("runtime failure")
	ErrAlreadyInstalled  = errors.NewKind("driver already installed: %s (image reference: %s)")
	ErrLanguageDetection = errors.NewKind("could not autodetect language")
)
View Source 
var (
	// DefaultMaxInstancesPerDriver is the maximum number of instances of
	// the same driver which can be launched following the default
	// scaling policy (see DefaultScalingPolicy()).
	DefaultMaxInstancesPerDriver = runtime.NumCPU()

	ErrPoolClosed         = errors.NewKind("driver pool already closed")
	ErrPoolTimeout        = errors.NewKind("timeout, all drivers are busy")
	ErrInvalidPoolTimeout = errors.NewKind(fmt.Sprintf("invalid timeout, max. timeout allowed %s", MaxPoolTimeout))
	ErrNegativeInstances  = errors.NewKind("cannot set instances to negative number")
)

Functions

func GetLanguage 

func GetLanguage(filename string, content []byte) string

GetLanguage detects the language of a file and returns it in a normalized form.

Types

type ControlService added in v1.2.0 

type ControlService struct {
	*Daemon
}

func NewControlService added in v1.2.0 

func NewControlService(d *Daemon) *ControlService

func (*ControlService) DriverInstanceStates added in v1.2.0 

func (s *ControlService) DriverInstanceStates() ([]*protocol.DriverInstanceState, error)

func (*ControlService) DriverPoolStates added in v1.2.0 

func (s *ControlService) DriverPoolStates() map[string]*protocol.DriverPoolState

func (*ControlService) DriverStates 

func (s *ControlService) DriverStates() ([]*protocol.DriverImageState, error)

type Daemon 

type Daemon struct {
	server.Server
	ControlServer *grpc.Server
	// contains filtered or unexported fields
}

Daemon is a Babelfish server.

func NewDaemon 

func NewDaemon(version string, r *runtime.Runtime) *Daemon

NewDaemon creates a new server based on the runtime with the given version.

func (*Daemon) Current added in v1.2.0 

func (d *Daemon) Current() map[string]*DriverPool

Current returns the current list of driver pools.

func (*Daemon) DriverPool 

func (d *Daemon) DriverPool(language string) (*DriverPool, error)

func (*Daemon) InstallDriver 

func (d *Daemon) InstallDriver(language string, image string, update bool) error

func (*Daemon) RemoveDriver 

func (d *Daemon) RemoveDriver(language string) error

func (*Daemon) Stop 

func (d *Daemon) Stop() error

Stop stops all the pools and containers.

type Driver 

type Driver interface {
	ID() string
	Start() error
	Stop() error
	Status() (protocol.Status, error)
	State() (*protocol.DriverInstanceState, error)
	Service() sdk.ProtocolServiceClient
}

type DriverInstance 

type DriverInstance struct {
	Language  string
	Process   *runtime.Process
	Container runtime.Container
	Image     runtime.DriverImage
	// contains filtered or unexported fields
}

DriverInstance represents an instance of a driver.

func NewDriverInstance 

func NewDriverInstance(r *runtime.Runtime, lang string, i runtime.DriverImage, o *Options) (*DriverInstance, error)

NewDriverInstance represents a running Driver in the runtime. Its holds the container and the connection to the internal grpc server.

func (*DriverInstance) ID added in v1.2.0 

func (i *DriverInstance) ID() string

ID returns the container id.

func (*DriverInstance) Service 

func (i *DriverInstance) Service() sdk.ProtocolServiceClient

Service returns the client using the grpc connection.

func (*DriverInstance) Start 

func (i *DriverInstance) Start() error

Start starts a container and connects to it.

func (*DriverInstance) State added in v1.2.0 

func (i *DriverInstance) State() (*protocol.DriverInstanceState, error)

State returns the current state of the driver instance.

func (*DriverInstance) Status 

func (i *DriverInstance) Status() (protocol.Status, error)

Status returns the current status of the container.

func (*DriverInstance) Stop 

func (i *DriverInstance) Stop() error

Stop stops the inner running container.

type DriverPool 

type DriverPool struct {
	// ScalingPolicy scaling policy used to scale up the instances.
	ScalingPolicy ScalingPolicy
	// Timeout time for wait until a driver instance is available.
	Timeout time.Duration
	// Logger used during the live of the driver pool.
	Logger server.Logger
	// contains filtered or unexported fields
}

DriverPool controls a pool of drivers and balances requests among them, ensuring each driver does not get concurrent requests. The number of driver instances in the driver pool is controlled by a ScalingPolicy.

func NewDriverPool 

func NewDriverPool(factory FactoryFunction) *DriverPool

NewDriverPool creates and starts a new DriverPool. It takes as parameters a FactoryFunction, used to instantiate new drivers.

func (*DriverPool) Current added in v1.2.0 

func (dp *DriverPool) Current() []Driver

Current returns a list of the current instances from the pool, it includes the running ones and those being stopped.

func (*DriverPool) Execute 

func (dp *DriverPool) Execute(c Function, timeout time.Duration) error

Execute executes the given Function in the first available driver instance. It gets a driver from the pool and forwards the request to it. If all drivers are busy, it will return an error after the timeout passes. If the DriverPool is closed, an error will be returned.

func (*DriverPool) Start 

func (dp *DriverPool) Start() error

Start stats the driver pool.

func (*DriverPool) State added in v1.2.0 

func (dp *DriverPool) State() *protocol.DriverPoolState

State current state of driver pool.

func (*DriverPool) Stop 

func (dp *DriverPool) Stop() error

Stop stop the driver pool, including all its underlying driver instances.

type FactoryFunction 

type FactoryFunction func() (Driver, error)

FactoryFunction is a factory function that creates new DriverInstance's.

type Function 

type Function func(d Driver) error

Function is a function to be executed using a given driver.

type Options 

type Options struct {
	LogLevel  string
	LogFormat string
}

type ScalingPolicy 

type ScalingPolicy interface {
	// Scale takes the number of total instances and the load. The load is
	// the number of request waiting or, there is none, it is a negative
	// value indicating how many instances are ready.
	Scale(total, load int) int
}

ScalingPolicy specifies whether instances should be started or stopped to cope with load.

func AIMD 

func AIMD(add int, mul float64) ScalingPolicy

AIMD returns a ScalingPolicy of additive increase / multiplicative decrease. Increases are of min(add, load). Decreases are of (ready / mul).

func DefaultScalingPolicy 

func DefaultScalingPolicy() ScalingPolicy

DefaultScalingPolicy returns a new instance of the default scaling policy. Instances returned by this function should not be reused.

func MinMax 

func MinMax(min, max int, p ScalingPolicy) ScalingPolicy

MinMax wraps a ScalingPolicy and applies a minimum and maximum to the number of instances.

func MovingAverage 

func MovingAverage(window int, p ScalingPolicy) ScalingPolicy

MovingAverage computes a moving average of the load and forwards it to the underlying scaling policy. This policy is stateful and not thread-safe, do not reuse its instances for multiple pools.

type Service added in v1.2.0 

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

func NewService added in v1.2.0 

func NewService(d *Daemon) *Service

func (*Service) NativeParse added in v1.2.0 

func (d *Service) NativeParse(req *sdk.NativeParseRequest) *sdk.NativeParseResponse

func (*Service) Parse added in v1.2.0 

func (d *Service) Parse(req *sdk.ParseRequest) *sdk.ParseResponse

func (*Service) Version added in v1.2.0 

func (d *Service) Version(req *sdk.VersionRequest) *sdk.VersionResponse

Source Files

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Directories

Path Synopsis
Package protocol is a generated protocol buffer package.
 Package protocol is a generated protocol buffer package.

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