clients

Documentation

Overview

Package clients provides REST-based integration with the core APIs of the EdgeX Foundry platform.

Each individual service client can be found in its respective package within clients. View the Subdirectories section below for more information.

While it is certainly possible to utilize the exported functions in this package to make calls to a given service, it is recommended (unless you really specifically know what you're doing) to use the service clients instead. The functions here are exported primarily for the use of the service clients.

Index

• Constants
• func CountRequest(ctx context.Context, urlSuffix string, urlClient interfaces.URLClient) (int, error)
• func DeleteRequest(ctx context.Context, urlSuffix string, urlClient interfaces.URLClient) error
• func FromContext(ctx context.Context, key string) string
• func GetRequest(ctx context.Context, urlSuffix string, urlClient interfaces.URLClient) ([]byte, error)
• func GetRequestWithURL(ctx context.Context, url string) ([]byte, error)
• func PostJSONRequest(ctx context.Context, urlSuffix string, data interface{}, ...) (string, error)
• func PostJSONRequestWithURL(ctx context.Context, url string, data interface{}) (string, error)
• func PostRequest(ctx context.Context, urlSuffix string, data []byte, ...) (string, error)
• func PostRequestWithURL(ctx context.Context, url string, data []byte) (string, error)
• func PutRequest(ctx context.Context, urlSuffix string, body []byte, ...) (string, error)
• func UpdateRequest(ctx context.Context, urlSuffix string, data interface{}, ...) error
• func UploadFileRequest(ctx context.Context, urlSuffix string, filePath string, ...) (string, error)
• type CorrelatedRequest
  • func NewCorrelatedRequest(ctx context.Context, req *http.Request) CorrelatedRequest

Constants

const (
	ClientMonitorDefault = 15000            // Defaults the interval at which a given service client will refresh its endpoint from the Registry, if used
	CorrelationHeader    = "correlation-id" // Sets the key of the Correlation ID HTTP header
)

Do not assume that if a constant is identified by your IDE as not being used within this module that it is not being used at all. Any application wishing to exchange information with the EdgeX core services will utilize this module, so constants located here may be used externally.

Miscellaneous constants

const (
	ApiVersionRoute            = "/api/version"
	ApiBase                    = "/api/v1"
	ApiAddressableRoute        = "/api/v1/addressable"
	ApiCallbackRoute           = "/api/v1/callback"
	ApiCommandRoute            = "/api/v1/command"
	ApiConfigRoute             = "/api/v1/config"
	ApiDeviceRoute             = "/api/v1/device"
	ApiDeviceProfileRoute      = "/api/v1/deviceprofile"
	ApiDeviceServiceRoute      = "/api/v1/deviceservice"
	ApiEventRoute              = "/api/v1/event"
	ApiHealthRoute             = "/api/v1/health"
	ApiLoggingRoute            = "/api/v1/logs"
	ApiMetricsRoute            = "/api/v1/metrics"
	ApiNotificationRoute       = "/api/v1/notification"
	ApiNotifyRegistrationRoute = "/api/v1/notify/registrations"
	ApiOperationRoute          = "/api/v1/operations"
	ApiPingRoute               = "/api/v1/ping"
	ApiProvisionWatcherRoute   = "/api/v1/provisionwatcher"
	ApiReadingRoute            = "/api/v1/reading"
	ApiRegistrationRoute       = "/api/v1/registration"
	ApiRegistrationByNameRoute = ApiRegistrationRoute + "/name"
	ApiSubscriptionRoute       = "/api/v1/subscription"
	ApiTransmissionRoute       = "/api/v1/transmission"
	ApiValueDescriptorRoute    = "/api/v1/valuedescriptor"
	ApiIntervalRoute           = "/api/v1/interval"
	ApiIntervalActionRoute     = "/api/v1/intervalaction"
)

Constants related to defined routes in the service APIs

const (
	ServiceKeyPrefix                    = "edgex-"
	ConfigSeedServiceKey                = "edgex-config-seed"
	CoreCommandServiceKey               = "edgex-core-command"
	CoreDataServiceKey                  = "edgex-core-data"
	CoreMetaDataServiceKey              = "edgex-core-metadata"
	SupportLoggingServiceKey            = "edgex-support-logging"
	SupportNotificationsServiceKey      = "edgex-support-notifications"
	SystemManagementAgentServiceKey     = "edgex-sys-mgmt-agent"
	SupportSchedulerServiceKey          = "edgex-support-scheduler"
	SecuritySecretStoreSetupServiceKey  = "edgex-security-secretstore-setup"
	SecuritySecretsSetupServiceKey      = "edgex-security-secrets-setup"
	SecurityProxySetupServiceKey        = "edgex-security-proxy-setup"
	SecurityFileTokenProviderServiceKey = "edgex-security-file-token-provider"
)

Constants related to how services identify themselves in the Service Registry

const (
	ContentType     = "Content-Type"
	ContentTypeCBOR = "application/cbor"
	ContentTypeJSON = "application/json"
	ContentTypeYAML = "application/x-yaml"
	ContentTypeText = "text/plain"
)

Constants related to the possible content types supported by the APIs

Functions

func CountRequest

func CountRequest(ctx context.Context, urlSuffix string, urlClient interfaces.URLClient) (int, error)

Helper method to make the count request

func DeleteRequest

func DeleteRequest(ctx context.Context, urlSuffix string, urlClient interfaces.URLClient) error

Helper method to make the delete request

func FromContext

func FromContext(ctx context.Context, key string) string

FromContext allows for the retrieval of the specified key's value from the supplied Context. If the value is not found, an empty string is returned.

func GetRequest

func GetRequest(ctx context.Context, urlSuffix string, urlClient interfaces.URLClient) ([]byte, error)

GetRequest will make a GET request to the specified URL with the root URL retrieved by the URLClient prepended. It returns the body as a byte array if successful and an error otherwise.

func GetRequestWithURL

func GetRequestWithURL(ctx context.Context, url string) ([]byte, error)

GetRequestWithURL will make a GET request to the specified URL. It returns the body as a byte array if successful and an error otherwise.

func PostJSONRequest

func PostJSONRequest(
	ctx context.Context,
	urlSuffix string,
	data interface{},
	urlClient interfaces.URLClient) (string, error)

Helper method to make the post JSON request and return the body

func PostJSONRequestWithURL

func PostJSONRequestWithURL(ctx context.Context, url string, data interface{}) (string, error)

PostJSONRequestWithURL will make a POST request to the specified URL with the object passed in marshaled into a JSON formatted byte array. It returns the body on success and an error otherwise.

func PostRequest

func PostRequest(ctx context.Context, urlSuffix string, data []byte, urlClient interfaces.URLClient) (string, error)

Helper method to make the post request and return the body

func PostRequestWithURL

func PostRequestWithURL(ctx context.Context, url string, data []byte) (string, error)

PostRequestWithURL will make a POST request to the specified URL. It returns the body as a byte array if successful and an error otherwise.

func PutRequest

func PutRequest(ctx context.Context, urlSuffix string, body []byte, urlClient interfaces.URLClient) (string, error)

Helper method to make the put request

func UpdateRequest

func UpdateRequest(ctx context.Context, urlSuffix string, data interface{}, urlClient interfaces.URLClient) error

Helper method to make the update request

func UploadFileRequest

func UploadFileRequest(
	ctx context.Context,
	urlSuffix string,
	filePath string,
	urlClient interfaces.URLClient) (string, error)

Helper method to make a post request in order to upload a file and return the request body

Types

type CorrelatedRequest

type CorrelatedRequest struct {
	*http.Request
}

CorrelatedRequest is a wrapper type for use in managing Correlation IDs during service to service API calls.

func NewCorrelatedRequest

func NewCorrelatedRequest(ctx context.Context, req *http.Request) CorrelatedRequest

NewCorrelatedRequest will add the Correlation ID header to the supplied request. If no Correlation ID header is present in the supplied context, one will be created along with a value.