github.com/GeniusesGroup/libgo@v0.0.0-20220929090155-5ff932cb408e/chapar/port.go (about)

     1  /* For license and copyright information please see LEGAL file in repository */
     2  
     3  package chapar
     4  
     5  import (
     6  	"bytes"
     7  
     8  	"../protocol"
     9  )
    10  
    11  type port struct {
    12  	portNumber         byte
    13  	mux                *Multiplexer
    14  	physicalConnection protocol.NetworkPhysicalConnection
    15  }
    16  
    17  func (p *port) PortNumber() byte { return p.portNumber }
    18  
    19  // Send send frame sync that block sender until frame send and sure received successfully!
    20  // transmitting that must be non blocking and queue frames for congestion situations!
    21  // A situation might be occur that a port available when a frame queued but when the time to send is come, the port broken and sender don't know about this!
    22  func (p *port) Send(frame []byte) (err protocol.Error) {
    23  	err = p.physicalConnection.Send(frame)
    24  	return
    25  }
    26  
    27  // SendAsync send frame async that will not block sender but frame might not send successfully
    28  // if port occur problem after port queued frame and caller can't notify about this situation!
    29  func (pm *port) SendAsync(frame []byte) (err protocol.Error) {
    30  	err = pm.physicalConnection.SendAsync(frame)
    31  	return
    32  }
    33  
    34  // Receive read the frame and call upper layer handler!
    35  func (p *port) Receive(frame []byte) {
    36  	var nexHeaderID = GetNextHeader(frame)
    37  	var path = GetPath(frame)
    38  	var payload = GetPayload(frame)
    39  
    40  	var conn = p.mux.connections.getConnectionByPath(path)
    41  	if conn == nil {
    42  		conn = p.mux.connections.newConnection(p, frame)
    43  	} else if !bytes.Equal(conn.pathFromPeer.Get(), path) {
    44  		// TODO::: receive frame on alternative path, Any action needed??
    45  	}
    46  
    47  	p.mux.getTransportHandler(nextHeaderID).Receive(conn, payload)
    48  	return
    49  }