channel

Documentation

Index

• Constants
• func AddHistory(host string) binding.Transformer
• type ChannelReference
  • func ParseChannel(host string) (ChannelReference, error)
  • func (r *ChannelReference) String() string
• type EventDispatcherConfig
  • func NewEventDisPatcherConfigFromConfigMap(config *corev1.ConfigMap) (EventDispatcherConfig, error)
• type EventDispatcherConfigStore
  • func NewEventDispatcherConfigStore(logger knconfigmap.Logger, ...) *EventDispatcherConfigStore
  • func (s *EventDispatcherConfigStore) GetConfig() EventDispatcherConfig
• type MessageDispatcher
• type MessageDispatcherImpl
  • func NewMessageDispatcher(logger *zap.Logger) *MessageDispatcherImpl
  • func NewMessageDispatcherFromConfig(logger *zap.Logger, config EventDispatcherConfig) *MessageDispatcherImpl
  • func NewMessageDispatcherFromSender(logger *zap.Logger, sender *kncloudevents.HttpMessageSender) *MessageDispatcherImpl
  • func (d *MessageDispatcherImpl) DispatchMessage(ctx context.Context, initialMessage cloudevents.Message, ...) error
• type MessageReceiver
  • func NewMessageReceiver(receiverFunc UnbufferedMessageReceiverFunc, logger *zap.Logger, ...) (*MessageReceiver, error)
  • func (r *MessageReceiver) ServeHTTP(response nethttp.ResponseWriter, request *nethttp.Request)
  • func (r *MessageReceiver) Start(ctx context.Context) error
• type MessageReceiverOptions
  • func ResolveMessageChannelFromHostHeader(hostToChannelFunc ResolveChannelFromHostFunc) MessageReceiverOptions
• type ResolveChannelFromHostFunc
• type UnbufferedMessageReceiverFunc
• type UnknownChannelError
  • func (e *UnknownChannelError) Error() string
• type UnknownHostError
  • func (e UnknownHostError) Error() string

Constants

const (
	// EventHistory is the header containing all channel hosts traversed by the event.
	// This is an experimental header: https://github.com/knative/eventing/issues/638.
	EventHistory          = "knativehistory"
	EventHistorySeparator = "; "
)

const EventDispatcherConfigMap = "config-imc-event-dispatcher"

EventDispatcherConfigMap is the name of the configmap for event dispatcher.

Functions

func AddHistory

func AddHistory(host string) binding.Transformer

Types

type ChannelReference

type ChannelReference struct {
	Namespace string
	Name      string
}

ChannelReference references a Channel within the cluster by name and namespace.

func ParseChannel

func ParseChannel(host string) (ChannelReference, error)

ParseChannel converts the channel's hostname into a channel reference.

func (*ChannelReference) String

func (r *ChannelReference) String() string

type EventDispatcherConfig

type EventDispatcherConfig struct {
	kncloudevents.ConnectionArgs
}

EventDispatcherConfig holds the configuration parameters for the event dispatcher.

func NewEventDisPatcherConfigFromConfigMap

func NewEventDisPatcherConfigFromConfigMap(config *corev1.ConfigMap) (EventDispatcherConfig, error)

NewEventDisPatcherConfigFromConfigMap converts a k8s configmap into EventDispatcherConfig.

type EventDispatcherConfigStore

type EventDispatcherConfigStore struct {
	*knconfigmap.UntypedStore
	// contains filtered or unexported fields
}

EventDispatcherConfigStore loads/unloads untyped configuration from configmap.

func NewEventDispatcherConfigStore

func NewEventDispatcherConfigStore(logger knconfigmap.Logger, onAfterStore ...func(name string, value interface{})) *EventDispatcherConfigStore

NewEventDispatcherConfigStore creates a configuration Store

func (*EventDispatcherConfigStore) GetConfig

func (s *EventDispatcherConfigStore) GetConfig() EventDispatcherConfig

GetConfig returns the current config in the store.

type MessageDispatcher

type MessageDispatcher interface {
	// DispatchMessage dispatches an event to a destination over HTTP.
	//
	// The destination and reply are URLs.
	DispatchMessage(ctx context.Context, message cloudevents.Message, additionalHeaders nethttp.Header, destination *url.URL, reply *url.URL, deadLetter *url.URL) error
}

type MessageDispatcherImpl

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

MessageDispatcherImpl dispatches events to a destination over HTTP.

func NewMessageDispatcher

func NewMessageDispatcher(logger *zap.Logger) *MessageDispatcherImpl

NewMessageDispatcher creates a new Message dispatcher that can dispatch events to HTTP destinations.

func NewMessageDispatcherFromConfig

func NewMessageDispatcherFromConfig(logger *zap.Logger, config EventDispatcherConfig) *MessageDispatcherImpl

NewMessageDispatcherFromConfig creates a new Message dispatcher based on config.

func NewMessageDispatcherFromSender

func NewMessageDispatcherFromSender(logger *zap.Logger, sender *kncloudevents.HttpMessageSender) *MessageDispatcherImpl

NewMessageDispatcherFromConfig creates a new Message dispatcher from a sender.

func (*MessageDispatcherImpl) DispatchMessage

func (d *MessageDispatcherImpl) DispatchMessage(ctx context.Context, initialMessage cloudevents.Message, initialAdditionalHeaders nethttp.Header, destination *url.URL, reply *url.URL, deadLetter *url.URL) error

type MessageReceiver

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

MessageReceiver starts a server to receive new events for the channel dispatcher. The new event is emitted via the receiver function.

func NewMessageReceiver

func NewMessageReceiver(receiverFunc UnbufferedMessageReceiverFunc, logger *zap.Logger, opts ...MessageReceiverOptions) (*MessageReceiver, error)

NewMessageReceiver creates an event receiver passing new events to the receiverFunc.

func (*MessageReceiver) ServeHTTP

func (r *MessageReceiver) ServeHTTP(response nethttp.ResponseWriter, request *nethttp.Request)

func (*MessageReceiver) Start

func (r *MessageReceiver) Start(ctx context.Context) error

Start begins to receive events for the receiver.

Only HTTP POST requests to the root path (/) are accepted. If other paths or methods are needed, use the HandleRequest method directly with another HTTP server.

type MessageReceiverOptions

type MessageReceiverOptions func(*MessageReceiver) error

ReceiverOptions provides functional options to MessageReceiver function.

func ResolveMessageChannelFromHostHeader

func ResolveMessageChannelFromHostHeader(hostToChannelFunc ResolveChannelFromHostFunc) MessageReceiverOptions

ResolveMessageChannelFromHostHeader is a ReceiverOption for NewMessageReceiver which enables the caller to overwrite the default behaviour defined by ParseChannel function.

type ResolveChannelFromHostFunc

type ResolveChannelFromHostFunc func(string) (ChannelReference, error)

ResolveChannelFromHostFunc function enables EventReceiver to get the Channel Reference from incoming request HostHeader before calling receiverFunc. Returns UnknownHostError if the channel is not found, otherwise returns a generic error.

type UnbufferedMessageReceiverFunc

type UnbufferedMessageReceiverFunc func(context.Context, ChannelReference, binding.Message, []binding.Transformer, nethttp.Header) error

UnbufferedMessageReceiverFunc is the function to be called for handling the message. The provided message is not buffered, so it can't be safely read more times. When you perform the write (or the buffering) of the Message, you must use the transformers provided as parameters. This function is responsible for invoking Message.Finish().

type UnknownChannelError

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

UnknownChannelError represents the error when an event is received by a channel dispatcher for a channel that does not exist.

func (*UnknownChannelError) Error

func (e *UnknownChannelError) Error() string

type UnknownHostError

type UnknownHostError string

UnknownHostError represents the error when a ResolveMessageChannelFromHostHeader func cannot resolve an host

func (UnknownHostError) Error

func (e UnknownHostError) Error() string