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100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
// Package tunnel provides gre network tunnelling
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package tunnel
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import (
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"errors"
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"time"
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"github.com/micro/go-micro/transport"
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)
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const (
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// send over one link
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Unicast Mode = iota
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// send to all channel listeners
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Multicast
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// send to all links
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Broadcast
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)
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var (
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// DefaultDialTimeout is the dial timeout if none is specified
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DefaultDialTimeout = time.Second * 5
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// ErrDialTimeout is returned by a call to Dial where the timeout occurs
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ErrDialTimeout = errors.New("dial timeout")
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// ErrDiscoverChan is returned when we failed to receive the "announce" back from a discovery
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ErrDiscoverChan = errors.New("failed to discover channel")
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// ErrLinkNotFound is returned when a link is specified at dial time and does not exist
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ErrLinkNotFound = errors.New("link not found")
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// ErrReadTimeout is a timeout on session.Recv
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ErrReadTimeout = errors.New("read timeout")
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)
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// Mode of the session
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type Mode uint8
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// Tunnel creates a gre tunnel on top of the go-micro/transport.
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// It establishes multiple streams using the Micro-Tunnel-Channel header
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// and Micro-Tunnel-Session header. The tunnel id is a hash of
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// the address being requested.
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type Tunnel interface {
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// Init initializes tunnel with options
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Init(opts ...Option) error
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// Address returns the address the tunnel is listening on
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Address() string
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// Connect connects the tunnel
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Connect() error
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// Close closes the tunnel
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Close() error
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// Links returns all the links the tunnel is connected to
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Links() []Link
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// Dial allows a client to connect to a channel
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Dial(channel string, opts ...DialOption) (Session, error)
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// Listen allows to accept connections on a channel
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Listen(channel string, opts ...ListenOption) (Listener, error)
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// String returns the name of the tunnel implementation
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String() string
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}
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// Link represents internal links to the tunnel
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type Link interface {
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// Id returns the link unique Id
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Id() string
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// Delay is the current load on the link (lower is better)
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Delay() int64
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// Length returns the roundtrip time as nanoseconds (lower is better)
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Length() int64
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// Current transfer rate as bits per second (lower is better)
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Rate() float64
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// Is this a loopback link
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Loopback() bool
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// State of the link: connected/closed/error
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State() string
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// honours transport socket
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transport.Socket
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}
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// The listener provides similar constructs to the transport.Listener
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type Listener interface {
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Accept() (Session, error)
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Channel() string
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Close() error
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}
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// Session is a unique session created when dialling or accepting connections on the tunnel
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type Session interface {
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// The unique session id
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Id() string
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// The channel name
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Channel() string
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// The link the session is on
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Link() string
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// a transport socket
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transport.Socket
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}
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// NewTunnel creates a new tunnel
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func NewTunnel(opts ...Option) Tunnel {
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return newTunnel(opts...)
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}
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