driver

package
v1.0.0 Latest Latest
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 Go to latest Published: Aug 17, 2021 License: Apache-2.0 Imports: 28 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	ServiceName = "edgex-device-rfid-llrp"

	ResourceReaderCap          = "ReaderCapabilities"
	ResourceReaderConfig       = "ReaderConfig"
	ResourceReaderNotification = "ReaderEventNotification"
	ResourceROSpec             = "ROSpec"
	ResourceROSpecID           = "ROSpecID"
	ResourceAccessSpec         = "AccessSpec"
	ResourceAccessSpecID       = "AccessSpecID"
	ResourceROAccessReport     = "ROAccessReport"

	ResourceAction = "Action"
	ActionDelete   = "Delete"
	ActionEnable   = "Enable"
	ActionDisable  = "Disable"
	ActionStart    = "Start"
	ActionStop     = "Stop"
	AttribVendor   = "vendor"
	AttribSubtype  = "subtype"
)
View Source 
const (
	Impinj = VendorIDType(25882)
	Alien  = VendorIDType(17996)
	Zebra  = VendorIDType(10642)
)
View Source 
const (
	SpeedwayR220 = ImpinjModelType(2001001)
	SpeedwayR420 = ImpinjModelType(2001002)
	XPortal      = ImpinjModelType(2001003)
	XArrayWM     = ImpinjModelType(2001004)
	XArrayEAP    = ImpinjModelType(2001006)
	XArray       = ImpinjModelType(2001007)
	XSpan        = ImpinjModelType(2001008)
	SpeedwayR120 = ImpinjModelType(2001009)
	R700         = ImpinjModelType(2001052)
)

Variables

View Source 
var (

	// ErrUnexpectedConfigItems is returned when the input configuration map has extra keys
	// and values that are left over after parsing is complete
	ErrUnexpectedConfigItems = errors.New("unexpected config items")
	// ErrParsingConfigValue is returned when we are unable to parse the value for a config key
	ErrParsingConfigValue = errors.New("unable to parse config value for key")
	// ErrMissingRequiredKey is returned when we are unable to parse the value for a config key
	ErrMissingRequiredKey = errors.New("missing required key")
)

Functions

func CreateDriverConfig 

func CreateDriverConfig(configMap map[string]string) (*driverConfiguration, error)

CreateDriverConfig creates a driverConfiguration object from the strings map provided by EdgeX

Types

type DeviceSDKService 

type DeviceSDKService struct {
	*service.DeviceService
	// contains filtered or unexported fields
}

func (*DeviceSDKService) DriverConfigs 

func (s *DeviceSDKService) DriverConfigs() map[string]string

DriverConfigs retrieves the driver specific configuration

func (*DeviceSDKService) SetDeviceOpState 

func (s *DeviceSDKService) SetDeviceOpState(name string, state contract.OperatingState) error

type Driver 

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

Driver manages a collection of devices that speak LLRP and connects them to the EdgeX ecosystem.

A driver must be initialized before use. This is typically done by the Device Service SDK. This package maintains a package-global variable which it exports via driver.Instance.

The Driver's exported methods are safe for concurrent use.

func Instance 

func Instance() *Driver

Instance returns the package-global Driver instance, creating it if necessary. It must be initialized before use via its Initialize method.

func (*Driver) AddDevice 

func (d *Driver) AddDevice(deviceName string, protocols protocolMap, adminState contract.AdminState) error

AddDevice tells the driver attempt to actively manage a device.

The Device Service SDK calls this when a new Device associated with this Device Service is added, so this assumes the device is already registered with EdgeX.

func (*Driver) Discover 

func (d *Driver) Discover()

Discover performs a discovery of LLRP readers on the network and passes them to EdgeX to get provisioned

func (*Driver) HandleReadCommands 

func (d *Driver) HandleReadCommands(devName string, p protocolMap, reqs []dsModels.CommandRequest) ([]*dsModels.CommandValue, error)

HandleReadCommands triggers a protocol Read operation for the specified device.

func (*Driver) HandleWriteCommands 

func (d *Driver) HandleWriteCommands(devName string, p protocolMap, reqs []dsModels.CommandRequest, params []*dsModels.CommandValue) error

HandleWriteCommands passes a slice of CommandRequest struct each representing a ResourceOperation for a specific device resource. Since the commands are actuation commands, params provide parameters for the individual command.

func (*Driver) Initialize 

func (d *Driver) Initialize(lc logger.LoggingClient, asyncCh chan<- *dsModels.AsyncValues, deviceCh chan<- []dsModels.DiscoveredDevice) error

Initialize performs protocol-specific initialization for the device service.

func (*Driver) NewLLRPDevice 

func (d *Driver) NewLLRPDevice(name string, address net.Addr, opState contract.OperatingState) *LLRPDevice

NewLLRPDevice returns an LLRPDevice which attempts to connect to the given address.

func (*Driver) RemoveDevice 

func (d *Driver) RemoveDevice(deviceName string, p protocolMap) error

RemoveDevice is a callback function that is invoked when a Device associated with this Device Service is removed

func (*Driver) Stop 

func (d *Driver) Stop(force bool) error

Stop the Driver, causing it to shutdown its active device connections and no longer process commands or upstream reports.

If force is false, the Driver attempts to gracefully shutdown active devices by sending them a CloseConnection message and waiting a short time for their response. If force is true, it immediately closes all active connections. In neither case does it tell devices to stop reading.

EdgeX says DeviceServices should close the async readings channel, but tracing their code reveals they call close on the channel, so doing so would cause a panic.

func (*Driver) UpdateDevice 

func (d *Driver) UpdateDevice(deviceName string, protocols protocolMap, adminState contract.AdminState) (err error)

UpdateDevice updates a device managed by this Driver.

The Device Service SDK calls it when a Device is updated, so this assumes the device is already registered with EdgeX.

If the Driver has a device with this name, but the device's address changes, this will shutdown any current connection associated with the named device, update the address, and attempt to reconnect at the new address and port. If the address is the same, nothing happens.

type ImpinjModelType 

type ImpinjModelType uint32

func (ImpinjModelType) HostnamePrefix 

func (imt ImpinjModelType) HostnamePrefix() string

HostnamePrefix will return the default hostname prefix of known Impinj readers

func (ImpinjModelType) String 

func (i ImpinjModelType) String() string

type LLRPDevice 

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

LLRPDevice manages a connection to a device that speaks LLRP, and notifies EdgeX of relevant device events.

LLRPDevice attempts to maintain a connection to the Reader, provides methods to retry message sends that fail due to closed connections, and notifies EdgeX if a Reader connection appears lost. It forwards ROAccessReports & ReaderEventNotifications to EdgeX.

It is safe to use an LLRPDevice's methods concurrently and when disconnected. If TrySend fails due to connection issues, it reattempts the send a few times, backing off between attempts.

Use Stop to stop actively managing the connection. After Stop, we no longer receive reports or event notifications, and all calls to TrySend will fail. At that point, to reconnect to the same Reader, you must create a new LLRPDevice instance.

func (*LLRPDevice) Stop 

func (l *LLRPDevice) Stop(ctx context.Context) error

Stop closes any open client connection and stops trying to reconnect.

If the context is not canceled or past its deadline, it'll attempt a graceful shutdown. Otherwise/if the context is canceled/times out before completion, it forcefully closes the connection.

func (*LLRPDevice) TrySend 

func (l *LLRPDevice) TrySend(ctx context.Context, request llrp.Outgoing, reply llrp.Incoming) error

TrySend works like the llrp.Client's SendFor method, but reattempts a send a few times if it fails due to a closed reader. Additionally, it enforces our KeepAlive interval for timeout detection upon SetReaderConfig messages.

func (*LLRPDevice) UpdateAddr 

func (l *LLRPDevice) UpdateAddr(ctx context.Context, addr net.Addr) error

UpdateAddr updates the device address.

If the device were Stopped, this won't start it, and this has no practical effect. It may return an error if closing the current connection fails for some reason. Nevertheless, it updates the address and will attempt to use it the next time it connects.

type MultiErr 

type MultiErr []error

func (MultiErr) Error 

func (me MultiErr) Error() string

type ServiceWrapper 

type ServiceWrapper interface {
	// Inherit
	Devices() []contract.Device
	GetDeviceByName(name string) (contract.Device, error)
	UpdateDevice(device contract.Device) error
	UpdateDeviceOperatingState(deviceName string, state string) error
	GetProvisionWatcherByName(name string) (contract.ProvisionWatcher, error)
	AddProvisionWatcher(watcher contract.ProvisionWatcher) (id string, err error)
	AddDevice(device contract.Device) (id string, err error)

	// Pass-through
	DriverConfigs() map[string]string

	// Custom functionality or macros
	SetDeviceOpState(name string, state contract.OperatingState) error
}

ServiceWrapper wraps an EdgeX SDK service so it can be easily mocked in tests.

type VendorIDType 

type VendorIDType uint32

func (VendorIDType) String 

func (i VendorIDType) String() string

Source Files

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