models

package
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 Go to latest Published: Jun 19, 2019 License: Apache-2.0 Imports: 11 Imported by: 4

Documentation

Overview

This package defines interfaces and structs used to build an EdgeX Foundry Device Service. The interfaces provide an asbstraction layer for the device or protocol specific logic of a Device Service, and the structs represents request and response data format used by the protocol driver.

Index

Constants

View Source 
const (
	// Policy limits should be located in global config namespace
	// Currently assigning 16MB (binary), 16 * 2^20 bytes
	MaxBinaryBytes = 16777216
	// DefaultFoloatEncoding indicates the representation of floating value of reading.
	// It would be configurable in system level in the future
	DefaultFloatEncoding = contract.Base64Encoding
)

Variables

This section is empty.

Functions

This section is empty.

Types

type AsyncValues 

type AsyncValues struct {
	DeviceName    string
	CommandValues []*CommandValue
}

AsyncValues is the struct for sending Device readings asynchronously via ProtocolDrivers

type CommandRequest 

type CommandRequest struct {
	// DeviceResourceName is the name of Device Resource for this command
	DeviceResourceName string
	// Attributes is a key/value map to represent the attributes of the Device Resource
	Attributes map[string]string
	// Type is the data type of the Device Resource
	Type ValueType
}

CommandRequest is the struct for requesting a command to ProtocolDrivers

type CommandValue 

type CommandValue struct {
	// DeviceResourceName is the name of Device Resource for this command
	DeviceResourceName string
	// Origin is an int64 value which indicates the time the reading
	// contained in the CommandValue was read by the ProtocolDriver
	// instance.
	Origin int64
	// Type is a ValueType value which indicates what type of
	// value was returned from the ProtocolDriver instance in
	// response to HandleCommand being called to handle a single
	// ResourceOperation.
	Type ValueType
	// NumericValue is a byte slice with a maximum capacity of
	// 64 bytes, used to hold a numeric value returned by a
	// ProtocolDriver instance. The value can be converted to
	// its native type by referring to the the value of ResType.
	NumericValue []byte

	// BinValue is a CBOR encoded binary value with a maximum
	// capacity of 1MB, used to hold binary values returned
	// by a ProtocolDriver instance. Its decoded value is externally accessed
	// using BinaryValue() method
	BinValue []byte
	// contains filtered or unexported fields
}

CommandValue is the struct to represent the reading value of a Get command coming from ProtocolDrivers or the parameter of a Put command sending to ProtocolDrivers.

func NewBinaryValue 

func NewBinaryValue(DeviceResourceName string, origin int64, value []byte) (cv *CommandValue, err error)

NewBinaryValue creates a CommandValue with binary payload and enforces the memory limit for event readings.

func NewBoolValue 

func NewBoolValue(DeviceResourceName string, origin int64, value bool) (cv *CommandValue, err error)

NewBoolValue creates a CommandValue of Type Bool with the given value.

func NewCommandValue 

func NewCommandValue(DeviceResourceName string, origin int64, value interface{}, t ValueType) (cv *CommandValue, err error)

NewCommandValue create a CommandValue according to the Type supplied.

func NewFloat32Value 

func NewFloat32Value(DeviceResourceName string, origin int64, value float32) (cv *CommandValue, err error)

NewFloat32Value creates a CommandValue of Type Float32 with the given value.

func NewFloat64Value 

func NewFloat64Value(DeviceResourceName string, origin int64, value float64) (cv *CommandValue, err error)

NewFloat64Value creates a CommandValue of Type Float64 with the given value.

func NewInt16Value 

func NewInt16Value(DeviceResourceName string, origin int64, value int16) (cv *CommandValue, err error)

NewInt16Value creates a CommandValue of Type Int16 with the given value.

func NewInt32Value 

func NewInt32Value(DeviceResourceName string, origin int64, value int32) (cv *CommandValue, err error)

NewInt32Value creates a CommandValue of Type Int32 with the given value.

func NewInt64Value 

func NewInt64Value(DeviceResourceName string, origin int64, value int64) (cv *CommandValue, err error)

NewInt64Value creates a CommandValue of Type Int64 with the given value.

func NewInt8Value 

func NewInt8Value(DeviceResourceName string, origin int64, value int8) (cv *CommandValue, err error)

NewInt8Value creates a CommandValue of Type Int8 with the given value.

func NewStringValue 

func NewStringValue(DeviceResourceName string, origin int64, value string) (cv *CommandValue)

NewStringValue creates a CommandValue of Type string with the given value.

func NewUint16Value 

func NewUint16Value(DeviceResourceName string, origin int64, value uint16) (cv *CommandValue, err error)

NewUint16Value creates a CommandValue of Type Uint16 with the given value.

func NewUint32Value 

func NewUint32Value(DeviceResourceName string, origin int64, value uint32) (cv *CommandValue, err error)

NewUint32Value creates a CommandValue of Type Uint32 with the given value.

func NewUint64Value 

func NewUint64Value(DeviceResourceName string, origin int64, value uint64) (cv *CommandValue, err error)

NewUint64Value creates a CommandValue of Type Uint64 with the given value.

func NewUint8Value 

func NewUint8Value(DeviceResourceName string, origin int64, value uint8) (cv *CommandValue, err error)

NewUint8Value creates a CommandValue of Type Uint8 with the given value.

func (*CommandValue) BinaryValue 

func (cv *CommandValue) BinaryValue() ([]byte, error)

BinaryValue returns the value in []byte data type, and returns error if the Type is not Binary.

func (*CommandValue) BoolValue 

func (cv *CommandValue) BoolValue() (bool, error)

BoolValue returns the value in bool data type, and returns error if the Type is not Bool.

func (*CommandValue) Float32Value 

func (cv *CommandValue) Float32Value() (float32, error)

Float32Value returns the value in float32 data type, and returns error if the Type is not Float32.

func (*CommandValue) Float64Value 

func (cv *CommandValue) Float64Value() (float64, error)

Float64Value returns the value in float64 data type, and returns error if the Type is not Float64.

func (*CommandValue) Int16Value 

func (cv *CommandValue) Int16Value() (int16, error)

Int16Value returns the value in int16 data type, and returns error if the Type is not Int16.

func (*CommandValue) Int32Value 

func (cv *CommandValue) Int32Value() (int32, error)

Int32Value returns the value in int32 data type, and returns error if the Type is not Int32.

func (*CommandValue) Int64Value 

func (cv *CommandValue) Int64Value() (int64, error)

Int64Value returns the value in int64 data type, and returns error if the Type is not Int64.

func (*CommandValue) Int8Value 

func (cv *CommandValue) Int8Value() (int8, error)

Int8Value returns the value in int8 data type, and returns error if the Type is not Int8.

func (*CommandValue) String 

func (cv *CommandValue) String() (str string)

String returns a string representation of a CommandValue instance.

func (*CommandValue) StringValue 

func (cv *CommandValue) StringValue() (string, error)

StringValue returns the value in string data type, and returns error if the Type is not String.

func (*CommandValue) Uint16Value 

func (cv *CommandValue) Uint16Value() (uint16, error)

Uint16Value returns the value in uint16 data type, and returns error if the Type is not Uint16.

func (*CommandValue) Uint32Value 

func (cv *CommandValue) Uint32Value() (uint32, error)

Uint32Value returns the value in uint21 data type, and returns error if the Type is not Uint32.

func (*CommandValue) Uint64Value 

func (cv *CommandValue) Uint64Value() (uint64, error)

Uint64Value returns the value in uint64 data type, and returns error if the Type is not Uint64.

func (*CommandValue) Uint8Value 

func (cv *CommandValue) Uint8Value() (uint8, error)

Uint8Value returns the value in uint8 data type, and returns error if the Type is not Uint8.

func (*CommandValue) ValueToString 

func (cv *CommandValue) ValueToString(encoding ...string) (str string)

ValueToString returns the string format of the value.

type Event 

type Event struct {
	contract.Event
	EncodedEvent []byte
}

Event is a wrapper of contract.Event to provide more Binary related operation in Device Service.

func (Event) HasBinaryValue 

func (e Event) HasBinaryValue() bool

HasBinaryValue confirms whether an event contains one or more readings populated with a BinaryValue payload.

type ProtocolDiscovery 

type ProtocolDiscovery interface {
	// Discover triggers protocol specific device discovery, which is
	// a synchronous operation which returns a list of new devices
	// which may be added to the device service based on service
	// config. This function may also optionally trigger sensor
	// discovery, which could result in dynamic device profile creation.
	//
	// TODO: add models.ScanList (or define locally) for devices
	Discover() (devices *interface{}, err error)
}

ProtocolDiscovery is a low-level device-specific interface implemented by device services that support dynamic device discovery.

type ProtocolDriver 

type ProtocolDriver interface {
	// Initialize performs protocol-specific initialization for the device
	// service. The given *AsyncValues channel can be used to push asynchronous
	// events and readings to Core Data.
	Initialize(lc logger.LoggingClient, asyncCh chan<- *AsyncValues) error

	// HandleReadCommands passes a slice of CommandRequest struct each representing
	// a ResourceOperation for a specific device resource.
	HandleReadCommands(deviceName string, protocols map[string]contract.ProtocolProperties, reqs []CommandRequest) ([]*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.
	HandleWriteCommands(deviceName string, protocols map[string]contract.ProtocolProperties, reqs []CommandRequest, params []*CommandValue) error

	// Stop instructs the protocol-specific DS code to shutdown gracefully, or
	// if the force parameter is 'true', immediately. The driver is responsible
	// for closing any in-use channels, including the channel used to send async
	// readings (if supported).
	Stop(force bool) error
}

ProtocolDriver is a low-level device-specific interface used by by other components of an EdgeX Device Service to interact with a specific class of devices.

type ValueType 

type ValueType int

ValueType indicates the type of value being passed back from a ProtocolDriver instance. 

const (
	// Bool indicates that the value is a bool,
	// stored in CommandValue's boolRes member.
	Bool ValueType = iota
	// String indicates that the value is a string,
	// stored in CommandValue's stringRes member.
	String
	// Uint8 indicates that the value is a uint8 that
	// is stored in CommandValue's NumericRes member.
	Uint8
	// Uint16 indicates that the value is a uint16 that
	// is stored in CommandValue's NumericRes member.
	Uint16
	// Uint32 indicates that the value is a uint32 that
	// is stored in CommandValue's NumericRes member.
	Uint32
	// Uint64 indicates that the value is a uint64 that
	// is stored in CommandValue's NumericRes member.
	Uint64
	// Int8 indicates that the value is a int8 that
	// is stored in CommandValue's NumericRes member.
	Int8
	// Int16 indicates that the value is a int16 that
	// is stored in CommandValue's NumericRes member.
	Int16
	// Int32 indicates that the value is a int32 that
	// is stored in CommandValue's NumericRes member.
	Int32
	// Int64 indicates that the value is a int64 that
	// is stored in CommandValue's NumericRes member.
	Int64
	// Float32 indicates that the value is a float32 that
	// is stored in CommandValue's NumericRes member.
	Float32
	// Float64 indicates that the value is a float64 that
	// is stored in CommandValue's NumericRes member.
	Float64
	// Binary indicates that the value is a binary payload that
	// is stored in CommandValue's ByteArrRes member.
	Binary
)

func ParseValueType 

func ParseValueType(typeName string) ValueType

ParseValueType could get ValueType from type name in string format if the type name cannot be parsed correctly, return String ValueType

Source Files

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