fetcher

Documentation

Index

• type File
  • func (f *File) Fetch() (io.Reader, error)
  • func (f *File) Init() error
• type HTTP
  • func (h *HTTP) Fetch() (io.Reader, error)
  • func (h *HTTP) Init() error
• type Interface
  • func Func(fn func() (io.Reader, error)) Interface

Types

type File

type File struct {
	Path     string
	Interval time.Duration
	// contains filtered or unexported fields
}

File checks the provided Path, at the provided Interval for new Go binaries. When a new binary is found it will replace the currently running binary.

func (*File) Fetch

func (f *File) Fetch() (io.Reader, error)

Fetch file from the specified Path

func (*File) Init

func (f *File) Init() error

Init sets the Path and Interval options

type HTTP

type HTTP struct {
	//URL to poll for new binaries
	URL          string
	Interval     time.Duration
	CheckHeaders []string
	// contains filtered or unexported fields
}

HTTP fetcher uses HEAD requests to poll the status of a given file. If it detects this file has been updated, it will fetch and return its io.Reader stream.

func (*HTTP) Fetch

func (h *HTTP) Fetch() (io.Reader, error)

Fetch the binary from the provided URL

func (*HTTP) Init

func (h *HTTP) Init() error

Init validates the provided config

type Interface

type Interface interface {
	//Init should perform validation on fields. For
	//example, ensure the appropriate URLs or keys
	//are defined or ensure there is connectivity
	//to the appropriate web service.
	Init() error
	//Fetch should check if there is an updated
	//binary to fetch, and then stream it back the
	//form of an io.Reader. If io.Reader is nil,
	//then it is assumed there are no updates. Fetch
	//will be run repeatedly and forever. It is up the
	//implementation to throttle the fetch frequency.
	Fetch() (io.Reader, error)
}

Interface defines the required fetcher functions

func Func

func Func(fn func() (io.Reader, error)) Interface

Func converts a fetch function into the fetcher interface