conn

Documentation

Overview

Package conn provides utilities related to connections.

Index

• type AfterFunc
• type Dialer
• type Manager
  • func NewManager(d Dialer, network, address string, after AfterFunc, logger log.Logger) *Manager
  • func (m *Manager) Put(err error)
  • func (m *Manager) Take() net.Conn

Types

type AfterFunc

type AfterFunc func(time.Duration) <-chan time.Time

AfterFunc imitates time.After.

type Dialer

type Dialer func(network, address string) (net.Conn, error)

Dialer imitates net.Dial. Dialer is assumed to yield connections that are safe for use by multiple concurrent goroutines.

type Manager

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

Manager manages a net.Conn.

Clients provide a way to create the connection with a Dialer, network, and address. Clients should Take the connection when they want to use it, and Put back whatever error they receive from its use. When a non-nil error is Put, the connection is invalidated, and a new connection is established. Connection failures are retried after an exponential backoff.

func NewManager

func NewManager(d Dialer, network, address string, after AfterFunc, logger log.Logger) *Manager

NewManager returns a connection manager using the passed Dialer, network, and address. The AfterFunc is used to control exponential backoff and retries. For normal use, pass net.Dial and time.After as the Dialer and AfterFunc respectively. The logger is used to log errors; pass a log.NopLogger if you don't care to receive them.

func (*Manager) Put

func (m *Manager) Put(err error)

Put accepts an error that came from a previously yielded connection. If the error is non-nil, the manager will invalidate the current connection and try to reconnect, with exponential backoff. Putting a nil error is a no-op.

func (*Manager) Take

func (m *Manager) Take() net.Conn

Take yields the current connection. It may be nil.