seaweedfs/weed/wdclient/net2/managed_connection.go

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package net2
import (
"fmt"
"net"
"time"
"errors"
"github.com/chrislusf/seaweedfs/weed/wdclient/resource_pool"
)
// Dial's arguments.
type NetworkAddress struct {
Network string
Address string
}
// A connection managed by a connection pool. NOTE: SetDeadline,
// SetReadDeadline and SetWriteDeadline are disabled for managed connections.
// (The deadlines are set by the connection pool).
type ManagedConn interface {
net.Conn
// This returns the original (network, address) entry used for creating
// the connection.
Key() NetworkAddress
// This returns the underlying net.Conn implementation.
RawConn() net.Conn
// This returns the connection pool which owns this connection.
Owner() ConnectionPool
// This indictes a user is done with the connection and releases the
// connection back to the connection pool.
ReleaseConnection() error
// This indicates the connection is an invalid state, and that the
// connection should be discarded from the connection pool.
DiscardConnection() error
}
// A physical implementation of ManagedConn
type managedConnImpl struct {
addr NetworkAddress
handle resource_pool.ManagedHandle
pool ConnectionPool
options ConnectionOptions
}
// This creates a managed connection wrapper.
func NewManagedConn(
network string,
address string,
handle resource_pool.ManagedHandle,
pool ConnectionPool,
options ConnectionOptions) ManagedConn {
addr := NetworkAddress{
Network: network,
Address: address,
}
return &managedConnImpl{
addr: addr,
handle: handle,
pool: pool,
options: options,
}
}
func (c *managedConnImpl) rawConn() (net.Conn, error) {
h, err := c.handle.Handle()
return h.(net.Conn), err
}
// See ManagedConn for documentation.
func (c *managedConnImpl) RawConn() net.Conn {
h, _ := c.handle.Handle()
return h.(net.Conn)
}
// See ManagedConn for documentation.
func (c *managedConnImpl) Key() NetworkAddress {
return c.addr
}
// See ManagedConn for documentation.
func (c *managedConnImpl) Owner() ConnectionPool {
return c.pool
}
// See ManagedConn for documentation.
func (c *managedConnImpl) ReleaseConnection() error {
return c.handle.Release()
}
// See ManagedConn for documentation.
func (c *managedConnImpl) DiscardConnection() error {
return c.handle.Discard()
}
// See net.Conn for documentation
func (c *managedConnImpl) Read(b []byte) (n int, err error) {
conn, err := c.rawConn()
if err != nil {
return 0, err
}
if c.options.ReadTimeout > 0 {
deadline := c.options.getCurrentTime().Add(c.options.ReadTimeout)
_ = conn.SetReadDeadline(deadline)
}
n, err = conn.Read(b)
if err != nil {
var localAddr string
if conn.LocalAddr() != nil {
localAddr = conn.LocalAddr().String()
} else {
localAddr = "(nil)"
}
var remoteAddr string
if conn.RemoteAddr() != nil {
remoteAddr = conn.RemoteAddr().String()
} else {
remoteAddr = "(nil)"
}
err = fmt.Errorf("Read error from host: %s <-> %s: %v", localAddr, remoteAddr, err)
}
return
}
// See net.Conn for documentation
func (c *managedConnImpl) Write(b []byte) (n int, err error) {
conn, err := c.rawConn()
if err != nil {
return 0, err
}
if c.options.WriteTimeout > 0 {
deadline := c.options.getCurrentTime().Add(c.options.WriteTimeout)
_ = conn.SetWriteDeadline(deadline)
}
n, err = conn.Write(b)
if err != nil {
err = fmt.Errorf("Write error: %v", err)
}
return
}
// See net.Conn for documentation
func (c *managedConnImpl) Close() error {
return c.handle.Discard()
}
// See net.Conn for documentation
func (c *managedConnImpl) LocalAddr() net.Addr {
conn, _ := c.rawConn()
return conn.LocalAddr()
}
// See net.Conn for documentation
func (c *managedConnImpl) RemoteAddr() net.Addr {
conn, _ := c.rawConn()
return conn.RemoteAddr()
}
// SetDeadline is disabled for managed connection (The deadline is set by
// us, with respect to the read/write timeouts specified in ConnectionOptions).
func (c *managedConnImpl) SetDeadline(t time.Time) error {
return errors.New("Cannot set deadline for managed connection")
}
// SetReadDeadline is disabled for managed connection (The deadline is set by
// us with respect to the read timeout specified in ConnectionOptions).
func (c *managedConnImpl) SetReadDeadline(t time.Time) error {
return errors.New("Cannot set read deadline for managed connection")
}
// SetWriteDeadline is disabled for managed connection (The deadline is set by
// us with respect to the write timeout specified in ConnectionOptions).
func (c *managedConnImpl) SetWriteDeadline(t time.Time) error {
return errors.New("Cannot set write deadline for managed connection")
}