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conn.go
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conn.go
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package bytecounter
//
// Code to wrap a net.Conn
//
import "net"
// wrappedConn wraps a network connection and counts bytes.
type wrappedConn struct {
// net.Conn is the underlying net.Conn.
net.Conn
// Counter is the byte counter.
Counter *Counter
}
// Read implements net.Conn.Read.
func (c *wrappedConn) Read(p []byte) (int, error) {
count, err := c.Conn.Read(p)
c.Counter.CountBytesReceived(count)
return count, err
}
// Write implements net.Conn.Write.
func (c *wrappedConn) Write(p []byte) (int, error) {
count, err := c.Conn.Write(p)
c.Counter.CountBytesSent(count)
return count, err
}
// WrapConn returns a new conn that uses the given counter.
func WrapConn(conn net.Conn, counter *Counter) net.Conn {
return &wrappedConn{Conn: conn, Counter: counter}
}
// MaybeWrapConn is like wrap if counter is not nil, otherwise it's a no-op.
func MaybeWrapConn(conn net.Conn, counter *Counter) net.Conn {
if counter == nil {
return conn
}
return WrapConn(conn, counter)
}