harness

package
v2.7.0-RC3+incompatible Latest Latest
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Published: Sep 26, 2018 License: Apache-2.0, BSD-3-Clause, MIT Imports: 19 Imported by: 0

Documentation

Overview

Package harness implements the SDK side of the Beam FnAPI.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func EnableCaptureHook

func EnableCaptureHook(name string, opts []string)

EnableCaptureHook is called to request the use of a hook in a pipeline. It updates the supplied pipelines to capture this request.

func Main

func Main(ctx context.Context, loggingEndpoint, controlEndpoint string) error

Main is the main entrypoint for the Go harness. It runs at "runtime" -- not "pipeline-construction time" -- on each worker. It is a FnAPI client and ultimately responsible for correctly executing user code.

func RegisterCaptureHook

func RegisterCaptureHook(name string, c CaptureHookFactory)

RegisterCaptureHook registers a CaptureHookFactory for the supplied identifier.

Types

type CaptureHook

type CaptureHook io.WriteCloser

CaptureHook writes the messaging content consumed and produced by the worker, allowing the data to be used as an input for the session runner. Since workers can exist in a variety of environments, this allows the runner to tailor the behavior best for its particular needs.

type CaptureHookFactory

type CaptureHookFactory func([]string) CaptureHook

CaptureHookFactory produces a CaptureHook from the supplied options.

type DataChannel

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

DataChannel manages a single multiplexed gRPC connection over the Data API. Data is pushed over the channel, so data for a reader may arrive before the reader connects. Thread-safe.

func (*DataChannel) OpenRead

func (c *DataChannel) OpenRead(ctx context.Context, target exec.Target, instID string) io.ReadCloser

func (*DataChannel) OpenWrite

func (c *DataChannel) OpenWrite(ctx context.Context, target exec.Target, instID string) io.WriteCloser

type DataChannelManager

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

DataChannelManager manages data channels over the Data API. A fixed number of channels are generally used, each managing multiple logical byte streams. Thread-safe.

func (*DataChannelManager) Open

func (m *DataChannelManager) Open(ctx context.Context, port exec.Port) (*DataChannel, error)

Open opens a R/W DataChannel over the given port.

type ScopedDataManager

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

ScopedDataManager scopes the global gRPC data manager to a single instruction. The indirection makes it easier to control access.

func NewScopedDataManager

func NewScopedDataManager(mgr *DataChannelManager, instID string) *ScopedDataManager

NewScopedDataManager returns a ScopedDataManager for the given instruction.

func (*ScopedDataManager) Close

func (s *ScopedDataManager) Close() error

func (*ScopedDataManager) OpenRead

func (s *ScopedDataManager) OpenRead(ctx context.Context, id exec.StreamID) (io.ReadCloser, error)

func (*ScopedDataManager) OpenWrite

func (s *ScopedDataManager) OpenWrite(ctx context.Context, id exec.StreamID) (io.WriteCloser, error)

type ScopedSideInputReader

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

ScopedSideInputReader scopes the global gRPC state manager to a single instruction for side input use. The indirection makes it easier to control access.

func NewScopedSideInputReader

func NewScopedSideInputReader(mgr *StateChannelManager, instID string) *ScopedSideInputReader

NewScopedSideInputReader returns a ScopedSideInputReader for the given instruction.

func (*ScopedSideInputReader) Close

func (s *ScopedSideInputReader) Close() error

func (*ScopedSideInputReader) Open

func (s *ScopedSideInputReader) Open(ctx context.Context, id exec.StreamID, key, w []byte) (io.ReadCloser, error)

type StateChannel

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

StateChannel manages state transactions over a single gRPC connection. It does not need to track readers and writers as carefully as the DataChannel, because the state protocol is request-based.

func (*StateChannel) Send

func (c *StateChannel) Send(req *pb.StateRequest) (*pb.StateResponse, error)

Send sends a state request and returns the response.

type StateChannelManager

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

StateChannelManager manages data channels over the State API. A fixed number of channels are generally used, each managing multiple logical byte streams. Thread-safe.

func (*StateChannelManager) Open

Open opens a R/W StateChannel over the given port.

Directories

Path Synopsis
Package init contains the harness initialization code defined by the FnAPI.
Package init contains the harness initialization code defined by the FnAPI.
Package session is a generated protocol buffer package.
Package session is a generated protocol buffer package.

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