appcontext

Documentation

Index

• type AppFunction
• type Context
  • func (appContext *Context) Complete(output []byte)
  • func (appContext *Context) GetSecrets(path string, keys ...string) (map[string]string, error)
  • func (appContext *Context) PushToCoreData(deviceName string, readingName string, value interface{}) (*dtos.Event, error)
  • func (appContext *Context) SetRetryData(payload []byte)

Types

type AppFunction

type AppFunction = func(edgexcontext *Context, params ...interface{}) (bool, interface{})

AppFunction is a type alias for func(edgexcontext *appcontext.Context, params ...interface{}) (bool, interface{})

type Context

type Context struct {
	// This is the ID used to track the EdgeX event through entire EdgeX framework.
	CorrelationID string
	// OutputData is used for specifying the data that is to be outputted. Leverage the .Complete() function to set.
	OutputData []byte
	// This holds the configuration for your service. This is the preferred way to access your custom application settings that have been set in the configuration.
	Configuration *common.ConfigurationStruct
	// LoggingClient is exposed to allow logging following the preferred logging strategy within EdgeX.
	LoggingClient logger.LoggingClient
	// EventClient exposes Core Data's EventClient API
	EventClient coredata.EventClient
	// ValueDescriptorClient exposes Core Data's ValueDescriptor API
	ValueDescriptorClient coredata.ValueDescriptorClient
	// CommandClient exposes Core Commands' Command API
	CommandClient command.CommandClient
	// NotificationsClient exposes Support Notification's Notifications API
	NotificationsClient notifications.NotificationsClient
	// RetryData holds the data to be stored for later retry when the pipeline function returns an error
	RetryData []byte
	// SecretProvider exposes the support for getting and storing secrets
	SecretProvider interfaces.SecretProvider
	// ResponseContentType is used for holding custom response type for HTTP trigger
	ResponseContentType string
}

Context ...

func (*Context) Complete

func (appContext *Context) Complete(output []byte)

Complete is optional and provides a way to return the specified data. In the case of an HTTP Trigger, the data will be returned as the http response. In the case of the message bus trigger, the data will be placed on the specified message bus publish topic and host in the configuration.

func (*Context) GetSecrets

func (appContext *Context) GetSecrets(path string, keys ...string) (map[string]string, error)

GetSecrets retrieves secrets from a secret store. path specifies the type or location of the secrets to retrieve. keys specifies the secrets which to retrieve. If no keys are provided then all the keys associated with the specified path will be returned.

func (*Context) PushToCoreData

func (appContext *Context) PushToCoreData(deviceName string, readingName string, value interface{}) (*dtos.Event, error)

PushToCoreData pushes the provided value as an event to CoreData using the device name and reading name that have been set. If validation is turned on in CoreServices then your deviceName and readingName must exist in the CoreMetadata and be properly registered in EdgeX.

func (*Context) SetRetryData

func (appContext *Context) SetRetryData(payload []byte)

SetRetryData sets the RetryData to the specified payload to be stored for later retry when the pipeline function returns an error.