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packetconn_unix.go
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packetconn_unix.go
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package vsrpc
import (
"context"
"net"
"time"
"github.com/chronos-tachyon/assert"
"github.com/chronos-tachyon/vsrpc/bufferpool"
)
const DefaultUnixMaxPacketSize = (1 << 24)
type UnixPacketDialer struct {
Dialer *net.Dialer
ListenConfig *net.ListenConfig
Now func() time.Time
MaxPacketSize uint
AcceptTimeout time.Duration
ReadTimeout time.Duration
WriteTimeout time.Duration
AcceptTimeoutEnabled bool
ReadTimeoutEnabled bool
WriteTimeoutEnabled bool
UnlinkOnClose bool
}
func (pd *UnixPacketDialer) DialPacket(ctx context.Context, addr net.Addr) (PacketConn, error) {
var zeroDialer net.Dialer
dialer := &zeroDialer
if pd != nil && pd.Dialer != nil {
dialer = pd.Dialer
}
conn, err := dialer.DialContext(ctx, addr.Network(), addr.String())
if err != nil {
return nil, err
}
pc := &UnixPacketConn{Conn: conn}
if pd != nil {
pc.Now = pd.Now
pc.MaxPacketSize = pd.MaxPacketSize
pc.ReadTimeout = pd.ReadTimeout
pc.WriteTimeout = pd.WriteTimeout
pc.ReadTimeoutEnabled = pd.ReadTimeoutEnabled
pc.WriteTimeoutEnabled = pd.WriteTimeoutEnabled
}
return pc, nil
}
func (pd *UnixPacketDialer) ListenPacket(ctx context.Context, addr net.Addr) (PacketListener, error) {
var zeroConfig net.ListenConfig
config := &zeroConfig
if pd != nil && pd.ListenConfig != nil {
config = pd.ListenConfig
}
listener, err := config.Listen(ctx, addr.Network(), addr.String())
if err != nil {
return nil, err
}
if pd != nil && pd.UnlinkOnClose {
if x, ok := listener.(*net.UnixListener); ok {
x.SetUnlinkOnClose(true)
}
}
pl := &UnixPacketListener{Listener: listener}
if pd != nil {
pl.Now = pd.Now
pl.MaxPacketSize = pd.MaxPacketSize
pl.AcceptTimeout = pd.AcceptTimeout
pl.ReadTimeout = pd.ReadTimeout
pl.WriteTimeout = pd.WriteTimeout
pl.AcceptTimeoutEnabled = pd.AcceptTimeoutEnabled
pl.ReadTimeoutEnabled = pd.ReadTimeoutEnabled
pl.WriteTimeoutEnabled = pd.WriteTimeoutEnabled
}
return pl, nil
}
var _ PacketDialer = (*UnixPacketDialer)(nil)
type UnixPacketListener struct {
Listener net.Listener
Now func() time.Time
MaxPacketSize uint
AcceptTimeout time.Duration
ReadTimeout time.Duration
WriteTimeout time.Duration
AcceptTimeoutEnabled bool
ReadTimeoutEnabled bool
WriteTimeoutEnabled bool
}
func (pl *UnixPacketListener) AcceptPacket(ctx context.Context) (pc PacketConn, err error) {
if pl == nil || pl.Listener == nil {
return nil, ErrClosed
}
var now time.Time
s, ok := pl.Listener.(deadlineSetter)
if ok {
var deadline time.Time
now = pl.now()
if pl.AcceptTimeoutEnabled {
deadline = now.Add(pl.AcceptTimeout)
}
if t, ok := ctx.Deadline(); ok {
if deadline.IsZero() || t.Before(deadline) {
deadline = t
}
}
err = s.SetDeadline(deadline)
if err != nil {
return
}
}
err = Watch(ctx, func() {
if ok {
_ = s.SetDeadline(now)
}
}, func() error {
conn, err := pl.Listener.Accept()
if err != nil {
return err
}
pc = &UnixPacketConn{
Conn: conn,
Now: pl.Now,
MaxPacketSize: pl.MaxPacketSize,
ReadTimeout: pl.ReadTimeout,
WriteTimeout: pl.WriteTimeout,
ReadTimeoutEnabled: pl.ReadTimeoutEnabled,
WriteTimeoutEnabled: pl.WriteTimeoutEnabled,
}
return nil
})
return
}
func (pl *UnixPacketListener) Addr() net.Addr {
if pl == nil || pl.Listener == nil {
return nil
}
return pl.Listener.Addr()
}
func (pl *UnixPacketListener) Close() error {
if pl == nil || pl.Listener == nil {
return nil
}
return pl.Listener.Close()
}
func (pl *UnixPacketListener) now() time.Time {
var fn func() time.Time = time.Now
if pl != nil && pl.Now != nil {
fn = pl.Now
}
return fn()
}
var _ PacketListener = (*UnixPacketListener)(nil)
type UnixPacketConn struct {
Conn net.Conn
Now func() time.Time
MaxPacketSize uint
ReadTimeout time.Duration
WriteTimeout time.Duration
ReadTimeoutEnabled bool
WriteTimeoutEnabled bool
}
func (pc *UnixPacketConn) ReadPacket(ctx context.Context) (packet []byte, dispose func(), err error) {
assert.NotNil(&ctx)
if pc == nil || pc.Conn == nil {
return nil, nil, ErrClosed
}
var deadline time.Time
now := pc.now()
if pc.ReadTimeoutEnabled {
deadline = now.Add(pc.ReadTimeout)
}
if t, ok := ctx.Deadline(); ok {
if deadline.IsZero() || t.Before(deadline) {
deadline = t
}
}
err = pc.Conn.SetReadDeadline(deadline)
if err != nil {
return
}
size := pc.MaxPacketSize
if size == 0 {
size = DefaultUnixMaxPacketSize
}
buffer := bufferpool.Allocate(size)
err = Watch(ctx, func() {
_ = pc.Conn.SetReadDeadline(now)
}, func() error {
n, err := pc.Conn.Read(buffer)
if err != nil {
bufferpool.Free(size, buffer)
return err
}
packet = buffer[:n]
dispose = func() { bufferpool.Free(size, buffer) }
return nil
})
return
}
func (pc *UnixPacketConn) WritePacket(ctx context.Context, packet []byte) error {
assert.NotNil(&ctx)
if pc == nil || pc.Conn == nil {
return ErrClosed
}
var deadline time.Time
now := pc.now()
if pc.WriteTimeoutEnabled {
deadline = now.Add(pc.WriteTimeout)
}
if t, ok := ctx.Deadline(); ok {
if deadline.IsZero() || t.Before(deadline) {
deadline = t
}
}
err := pc.Conn.SetWriteDeadline(deadline)
if err != nil {
return err
}
return Watch(ctx, func() {
_ = pc.Conn.SetWriteDeadline(now)
}, func() error {
_, err := pc.Conn.Write(packet)
return err
})
}
func (pc *UnixPacketConn) LocalAddr() net.Addr {
if pc == nil || pc.Conn == nil {
return nil
}
return pc.Conn.LocalAddr()
}
func (pc *UnixPacketConn) RemoteAddr() net.Addr {
if pc == nil || pc.Conn == nil {
return nil
}
return pc.Conn.RemoteAddr()
}
func (pc *UnixPacketConn) Close() error {
if pc == nil || pc.Conn == nil {
return ErrClosed
}
return pc.Conn.Close()
}
func (pc *UnixPacketConn) now() time.Time {
var fn func() time.Time = time.Now
if pc != nil && pc.Now != nil {
fn = pc.Now
}
return fn()
}
var _ PacketConn = (*UnixPacketConn)(nil)