micro/tunnel/tunnel.go

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// Package tunnel provides gre network tunnelling
package tunnel
import (
"errors"
"time"
"github.com/micro/go-micro/transport"
)
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const (
// send over one link
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Unicast Mode = iota
// 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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var (
// DefaultDialTimeout is the dial timeout if none is specified
DefaultDialTimeout = time.Second * 5
// ErrDialTimeout is returned by a call to Dial where the timeout occurs
ErrDialTimeout = errors.New("dial timeout")
// ErrDiscoverChan is returned when we failed to receive the "announce" back from a discovery
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
ErrLinkNotFound = errors.New("link not found")
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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.
// 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
// the address being requested.
type Tunnel interface {
// Init initializes tunnel with options
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Init(opts ...Option) error
// Address returns the address the tunnel is listening on
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Address() string
// Connect connects the tunnel
Connect() error
// Close closes the tunnel
Close() error
// Links returns all the links the tunnel is connected to
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Links() []Link
// Dial allows a client to connect to a channel
Dial(channel string, opts ...DialOption) (Session, error)
// Listen allows to accept connections on a channel
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Listen(channel string, opts ...ListenOption) (Listener, error)
// 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
type Link interface {
// 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
// Length returns the roundtrip time as nanoseconds (lower is better)
Length() int64
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// Current transfer rate as bits per second (lower is better)
Rate() float64
// State of the link e.g connected/closed
State() string
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// honours transport socket
transport.Socket
}
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// The listener provides similar constructs to the transport.Listener
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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// Session is a unique session created when dialling or accepting connections on the tunnel
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
Link() string
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// a transport socket
transport.Socket
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}
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// NewTunnel creates a new tunnel
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func NewTunnel(opts ...Option) Tunnel {
return newTunnel(opts...)
}