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NetCoreServer/source/NetCoreServer/UdpServer.cs at master · dotNetTreasury/NetCoreServer · GitHub
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using
System
;
using
System
.
Diagnostics
;
using
System
.
Net
;
using
System
.
Net
.
Sockets
;
using
System
.
Text
;
namespace
NetCoreServer
{
/// <summary>
/// UDP server is used to send or multicast datagrams to UDP endpoints
/// </summary>
/// <remarks>Thread-safe</remarks>
public
class
UdpServer
:
IDisposable
{
/// <summary>
/// Initialize UDP server with a given IP address and port number
/// </summary>
/// <param name="address">IP address</param>
/// <param name="port">Port number</param>
public
UdpServer
(
IPAddress
address
,
int
port
)
:
this
(
new
IPEndPoint
(
address
,
port
)
)
{
}
/// <summary>
/// Initialize UDP server with a given IP address and port number
/// </summary>
/// <param name="address">IP address</param>
/// <param name="port">Port number</param>
public
UdpServer
(
string
address
,
int
port
)
:
this
(
new
IPEndPoint
(
IPAddress
.
Parse
(
address
)
,
port
)
)
{
}
/// <summary>
/// Initialize UDP server with a given DNS endpoint
/// </summary>
/// <param name="endpoint">DNS endpoint</param>
public
UdpServer
(
DnsEndPoint
endpoint
)
:
this
(
endpoint
as
EndPoint
,
endpoint
.
Host
,
endpoint
.
Port
)
{
}
/// <summary>
/// Initialize UDP server with a given IP endpoint
/// </summary>
/// <param name="endpoint">IP endpoint</param>
public
UdpServer
(
IPEndPoint
endpoint
)
:
this
(
endpoint
as
EndPoint
,
endpoint
.
Address
.
ToString
(
)
,
endpoint
.
Port
)
{
}
/// <summary>
/// Initialize UDP server with a given endpoint, address and port
/// </summary>
/// <param name="endpoint">Endpoint</param>
/// <param name="address">Server address</param>
/// <param name="port">Server port</param>
private
UdpServer
(
EndPoint
endpoint
,
string
address
,
int
port
)
{
Id
=
Guid
.
NewGuid
(
)
;
Address
=
address
;
Port
=
port
;
Endpoint
=
endpoint
;
}
/// <summary>
/// Server Id
/// </summary>
public
Guid
Id
{
get
;
}
/// <summary>
/// UDP server address
/// </summary>
public
string
Address
{
get
;
}
/// <summary>
/// UDP server port
/// </summary>
public
int
Port
{
get
;
}
/// <summary>
/// Endpoint
/// </summary>
public
EndPoint
Endpoint
{
get
;
private
set
;
}
/// <summary>
/// Multicast endpoint
/// </summary>
public
EndPoint
MulticastEndpoint
{
get
;
private
set
;
}
/// <summary>
/// Socket
/// </summary>
public
Socket
Socket
{
get
;
private
set
;
}
/// <summary>
/// Number of bytes pending sent by the server
/// </summary>
public
long
BytesPending
{
get
;
private
set
;
}
/// <summary>
/// Number of bytes sending by the server
/// </summary>
public
long
BytesSending
{
get
;
private
set
;
}
/// <summary>
/// Number of bytes sent by the server
/// </summary>
public
long
BytesSent
{
get
;
private
set
;
}
/// <summary>
/// Number of bytes received by the server
/// </summary>
public
long
BytesReceived
{
get
;
private
set
;
}
/// <summary>
/// Number of datagrams sent by the server
/// </summary>
public
long
DatagramsSent
{
get
;
private
set
;
}
/// <summary>
/// Number of datagrams received by the server
/// </summary>
public
long
DatagramsReceived
{
get
;
private
set
;
}
/// <summary>
/// Option: dual mode socket
/// </summary>
/// <remarks>
/// Specifies whether the Socket is a dual-mode socket used for both IPv4 and IPv6.
/// Will work only if socket is bound on IPv6 address.
/// </remarks>
public
bool
OptionDualMode
{
get
;
set
;
}
/// <summary>
/// Option: reuse address
/// </summary>
/// <remarks>
/// This option will enable/disable SO_REUSEADDR if the OS support this feature
/// </remarks>
public
bool
OptionReuseAddress
{
get
;
set
;
}
/// <summary>
/// Option: enables a socket to be bound for exclusive access
/// </summary>
/// <remarks>
/// This option will enable/disable SO_EXCLUSIVEADDRUSE if the OS support this feature
/// </remarks>
public
bool
OptionExclusiveAddressUse
{
get
;
set
;
}
/// <summary>
/// Option: receive buffer limit
/// </summary>
public
int
OptionReceiveBufferLimit
{
get
;
set
;
}
=
0
;
/// <summary>
/// Option: receive buffer size
/// </summary>
public
int
OptionReceiveBufferSize
{
get
;
set
;
}
=
8192
;
/// <summary>
/// Option: send buffer limit
/// </summary>
public
int
OptionSendBufferLimit
{
get
;
set
;
}
=
0
;
/// <summary>
/// Option: send buffer size
/// </summary>
public
int
OptionSendBufferSize
{
get
;
set
;
}
=
8192
;
#region Connect/Disconnect client
/// <summary>
/// Is the server started?
/// </summary>
public
bool
IsStarted
{
get
;
private
set
;
}
/// <summary>
/// Create a new socket object
/// </summary>
/// <remarks>
/// Method may be override if you need to prepare some specific socket object in your implementation.
/// </remarks>
/// <returns>Socket object</returns>
protected
virtual
Socket
CreateSocket
(
)
{
return
new
Socket
(
Endpoint
.
AddressFamily
,
SocketType
.
Dgram
,
ProtocolType
.
Udp
)
;
}
/// <summary>
/// Start the server (synchronous)
/// </summary>
/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>
public
virtual
bool
Start
(
)
{
Debug
.
Assert
(
!
IsStarted
,
"UDP server is already started!"
)
;
if
(
IsStarted
)
return
false
;
// Setup buffers
_receiveBuffer
=
new
Buffer
(
)
;
_sendBuffer
=
new
Buffer
(
)
;
// Setup event args
_receiveEventArg
=
new
SocketAsyncEventArgs
(
)
;
_receiveEventArg
.
Completed
+=
OnAsyncCompleted
;
_sendEventArg
=
new
SocketAsyncEventArgs
(
)
;
_sendEventArg
.
Completed
+=
OnAsyncCompleted
;
// Create a new server socket
Socket
=
CreateSocket
(
)
;
// Update the server socket disposed flag
IsSocketDisposed
=
false
;
// Apply the option: reuse address
Socket
.
SetSocketOption
(
SocketOptionLevel
.
Socket
,
SocketOptionName
.
ReuseAddress
,
OptionReuseAddress
)
;
// Apply the option: exclusive address use
Socket
.
SetSocketOption
(
SocketOptionLevel
.
Socket
,
SocketOptionName
.
ExclusiveAddressUse
,
OptionExclusiveAddressUse
)
;
// Apply the option: dual mode (this option must be applied before recieving)
if
(
Socket
.
AddressFamily
==
AddressFamily
.
InterNetworkV6
)
Socket
.
DualMode
=
OptionDualMode
;
// Bind the server socket to the endpoint
Socket
.
Bind
(
Endpoint
)
;
// Refresh the endpoint property based on the actual endpoint created
Endpoint
=
Socket
.
LocalEndPoint
;
// Call the server starting handler
OnStarting
(
)
;
// Prepare receive endpoint
_receiveEndpoint
=
new
IPEndPoint
(
(
Endpoint
.
AddressFamily
==
AddressFamily
.
InterNetworkV6
)
?
IPAddress
.
IPv6Any
:
IPAddress
.
Any
,
0
)
;
// Prepare receive & send buffers
_receiveBuffer
.
Reserve
(
OptionReceiveBufferSize
)
;
// Reset statistic
BytesPending
=
0
;
BytesSending
=
0
;
BytesSent
=
0
;
BytesReceived
=
0
;
DatagramsSent
=
0
;
DatagramsReceived
=
0
;
// Update the started flag
IsStarted
=
true
;
// Call the server started handler
OnStarted
(
)
;
return
true
;
}
/// <summary>
/// Start the server with a given multicast IP address and port number (synchronous)
/// </summary>
/// <param name="multicastAddress">Multicast IP address</param>
/// <param name="multicastPort">Multicast port number</param>
/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>
public
virtual
bool
Start
(
IPAddress
multicastAddress
,
int
multicastPort
)
=>
Start
(
new
IPEndPoint
(
multicastAddress
,
multicastPort
)
)
;
/// <summary>
/// Start the server with a given multicast IP address and port number (synchronous)
/// </summary>
/// <param name="multicastAddress">Multicast IP address</param>
/// <param name="multicastPort">Multicast port number</param>
/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>
public
virtual
bool
Start
(
string
multicastAddress
,
int
multicastPort
)
=>
Start
(
new
IPEndPoint
(
IPAddress
.
Parse
(
multicastAddress
)
,
multicastPort
)
)
;
/// <summary>
/// Start the server with a given multicast endpoint (synchronous)
/// </summary>
/// <param name="multicastEndpoint">Multicast endpoint</param>
/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>
public
virtual
bool
Start
(
EndPoint
multicastEndpoint
)
{
MulticastEndpoint
=
multicastEndpoint
;
return
Start
(
)
;
}
/// <summary>
/// Stop the server (synchronous)
/// </summary>
/// <returns>'true' if the server was successfully stopped, 'false' if the server is already stopped</returns>
public
virtual
bool
Stop
(
)
{
Debug
.
Assert
(
IsStarted
,
"UDP server is not started!"
)
;
if
(
!
IsStarted
)
return
false
;
// Reset event args
_receiveEventArg
.
Completed
-=
OnAsyncCompleted
;
_sendEventArg
.
Completed
-=
OnAsyncCompleted
;
// Call the server stopping handler
OnStopping
(
)
;
try
{
// Close the server socket
Socket
.
Close
(
)
;
// Dispose the server socket
Socket
.
Dispose
(
)
;
// Dispose event arguments
_receiveEventArg
.
Dispose
(
)
;
_sendEventArg
.
Dispose
(
)
;
// Update the server socket disposed flag
IsSocketDisposed
=
true
;
}
catch
(
ObjectDisposedException
)
{
}
// Update the started flag
IsStarted
=
false
;
// Update sending/receiving flags
_receiving
=
false
;
_sending
=
false
;
// Clear send/receive buffers
ClearBuffers
(
)
;
// Call the server stopped handler
OnStopped
(
)
;
return
true
;
}
/// <summary>
/// Restart the server (synchronous)
/// </summary>
/// <returns>'true' if the server was successfully restarted, 'false' if the server failed to restart</returns>
public
virtual
bool
Restart
(
)
{
if
(
!
Stop
(
)
)
return
false
;
return
Start
(
)
;
}
#endregion
#region Send/Receive data
// Receive and send endpoints
EndPoint
_receiveEndpoint
;
EndPoint
_sendEndpoint
;
// Receive buffer
private
bool
_receiving
;
private
Buffer
_receiveBuffer
;
private
SocketAsyncEventArgs
_receiveEventArg
;
// Send buffer
private
bool
_sending
;
private
Buffer
_sendBuffer
;
private
SocketAsyncEventArgs
_sendEventArg
;
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast</param>
/// <returns>Size of multicasted datagram</returns>
public
virtual
long
Multicast
(
byte
[
]
buffer
)
=>
Multicast
(
buffer
.
AsSpan
(
)
)
;
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>Size of multicasted datagram</returns>
public
virtual
long
Multicast
(
byte
[
]
buffer
,
long
offset
,
long
size
)
=>
Multicast
(
buffer
.
AsSpan
(
(
int
)
offset
,
(
int
)
size
)
)
;
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast as a span of bytes</param>
/// <returns>Size of multicasted datagram</returns>
public
virtual
long
Multicast
(
ReadOnlySpan
<
byte
>
buffer
)
=>
Send
(
MulticastEndpoint
,
buffer
)
;
/// <summary>
/// Multicast text to the prepared mulicast endpoint (synchronous)
/// </summary>
/// <param name="text">Text string to multicast</param>
/// <returns>Size of multicasted datagram</returns>
public
virtual
long
Multicast
(
string
text
)
=>
Multicast
(
Encoding
.
UTF8
.
GetBytes
(
text
)
)
;
/// <summary>
/// Multicast text to the prepared mulicast endpoint (synchronous)
/// </summary>
/// <param name="text">Text to multicast as a span of characters</param>
/// <returns>Size of multicasted datagram</returns>
public
virtual
long
Multicast
(
ReadOnlySpan
<
char
>
text
)
=>
Multicast
(
Encoding
.
UTF8
.
GetBytes
(
text
.
ToArray
(
)
)
)
;
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (asynchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast</param>
/// <returns>'true' if the datagram was successfully multicasted, 'false' if the datagram was not multicasted</returns>
public
virtual
bool
MulticastAsync
(
byte
[
]
buffer
)
=>
MulticastAsync
(
buffer
.
AsSpan
(
)
)
;
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (asynchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>'true' if the datagram was successfully multicasted, 'false' if the datagram was not multicasted</returns>
public
virtual
bool
MulticastAsync
(
byte
[
]
buffer
,
long
offset
,
long
size
)
=>
MulticastAsync
(
buffer
.
AsSpan
(
(
int
)
offset
,
(
int
)
size
)
)
;
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (asynchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast as a span of bytes</param>
/// <returns>'true' if the datagram was successfully multicasted, 'false' if the datagram was not multicasted</returns>
public
virtual
bool
MulticastAsync
(
ReadOnlySpan
<
byte
>
buffer
)
=>
SendAsync
(
MulticastEndpoint
,
buffer
)
;
/// <summary>
/// Multicast text to the prepared mulicast endpoint (asynchronous)
/// </summary>
/// <param name="text">Text string to multicast</param>
/// <returns>'true' if the text was successfully multicasted, 'false' if the text was not multicasted</returns>
public
virtual
bool
MulticastAsync
(
string
text
)
=>
MulticastAsync
(
Encoding
.
UTF8
.
GetBytes
(
text
)
)
;
/// <summary>
/// Multicast text to the prepared mulicast endpoint (asynchronous)
/// </summary>
/// <param name="text">Text to multicast as a span of characters</param>
/// <returns>'true' if the text was successfully multicasted, 'false' if the text was not multicasted</returns>
public
virtual
bool
MulticastAsync
(
ReadOnlySpan
<
char
>
text
)
=>
MulticastAsync
(
Encoding
.
UTF8
.
GetBytes
(
text
.
ToArray
(
)
)
)
;
/// <summary>
/// Send datagram to the connected server (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to send</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
byte
[
]
buffer
)
=>
Send
(
buffer
.
AsSpan
(
)
)
;
/// <summary>
/// Send datagram to the connected server (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to send</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
byte
[
]
buffer
,
long
offset
,
long
size
)
=>
Send
(
buffer
.
AsSpan
(
(
int
)
offset
,
(
int
)
size
)
)
;
/// <summary>
/// Send datagram to the connected server (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to send as a span of bytes</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
ReadOnlySpan
<
byte
>
buffer
)
=>
Send
(
Endpoint
,
buffer
)
;
/// <summary>
/// Send text to the connected server (synchronous)
/// </summary>
/// <param name="text">Text string to send</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
string
text
)
=>
Send
(
Encoding
.
UTF8
.
GetBytes
(
text
)
)
;
/// <summary>
/// Send text to the connected server (synchronous)
/// </summary>
/// <param name="text">Text to send as a span of characters</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
ReadOnlySpan
<
char
>
text
)
=>
Send
(
Encoding
.
UTF8
.
GetBytes
(
text
.
ToArray
(
)
)
)
;
/// <summary>
/// Send datagram to the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
EndPoint
endpoint
,
byte
[
]
buffer
)
=>
Send
(
endpoint
,
buffer
.
AsSpan
(
)
)
;
/// <summary>
/// Send datagram to the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
EndPoint
endpoint
,
byte
[
]
buffer
,
long
offset
,
long
size
)
=>
Send
(
endpoint
,
buffer
.
AsSpan
(
(
int
)
offset
,
(
int
)
size
)
)
;
/// <summary>
/// Send datagram to the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send as a span of bytes</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
EndPoint
endpoint
,
ReadOnlySpan
<
byte
>
buffer
)
{
if
(
!
IsStarted
)
return
0
;
if
(
buffer
.
IsEmpty
)
return
0
;
try
{
// Sent datagram to the client
long
sent
=
Socket
.
SendTo
(
buffer
,
SocketFlags
.
None
,
endpoint
)
;
if
(
sent
>
0
)
{
// Update statistic
DatagramsSent
++
;
BytesSent
+=
sent
;
// Call the datagram sent handler
OnSent
(
endpoint
,
sent
)
;
}
return
sent
;
}
catch
(
ObjectDisposedException
)
{
return
0
;
}
catch
(
SocketException
ex
)
{
SendError
(
ex
.
SocketErrorCode
)
;
return
0
;
}
}
/// <summary>
/// Send text to the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="text">Text string to send</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
EndPoint
endpoint
,
string
text
)
=>
Send
(
endpoint
,
Encoding
.
UTF8
.
GetBytes
(
text
)
)
;
/// <summary>
/// Send text to the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="text">Text to send as a span of characters</param>
/// <returns>Size of sent datagram</returns>
public
virtual
long
Send
(
EndPoint
endpoint
,
ReadOnlySpan
<
char
>
text
)
=>
Send
(
endpoint
,
Encoding
.
UTF8
.
GetBytes
(
text
.
ToArray
(
)
)
)
;
/// <summary>
/// Send datagram to the given endpoint (asynchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send</param>
/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>
public
virtual
bool
SendAsync
(
EndPoint
endpoint
,
byte
[
]
buffer
)
=>
SendAsync
(
endpoint
,
buffer
.
AsSpan
(
)
)
;
/// <summary>
/// Send datagram to the given endpoint (asynchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>
public
virtual
bool
SendAsync
(
EndPoint
endpoint
,
byte
[
]
buffer
,
long
offset
,
long
size
)
=>
SendAsync
(
endpoint
,
buffer
.
AsSpan
(
(
int
)
offset
,
(
int
)
size
)
)
;
/// <summary>
/// Send datagram to the given endpoint (asynchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send as a span of bytes</param>
/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>
public
virtual
bool
SendAsync
(
EndPoint
endpoint
,
ReadOnlySpan
<
byte
>
buffer
)
{
if
(
_sending
)
return
false
;
if
(
!
IsStarted
)
return
false
;
if
(
buffer
.
IsEmpty
)
return
true
;
// Check the send buffer limit
if
(
(
(
_sendBuffer
.
Size
+
buffer
.
Length
)
>
OptionSendBufferLimit
)
&&
(
OptionSendBufferLimit
>
0
)
)
{
SendError
(
SocketError
.
NoBufferSpaceAvailable
)
;
return
false
;
}
// Fill the main send buffer
_sendBuffer
.
Append
(
buffer
)
;
// Update statistic
BytesSending
=
_sendBuffer
.
Size
;
// Update send endpoint
_sendEndpoint
=
endpoint
;
// Try to send the main buffer
TrySend
(
)
;
return
true
;
}
/// <summary>
/// Send text to the given endpoint (asynchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="text">Text string to send</param>
/// <returns>'true' if the text was successfully sent, 'false' if the text was not sent</returns>
public
virtual
bool
SendAsync
(
EndPoint
endpoint
,
string
text
)
=>
SendAsync
(
endpoint
,
Encoding
.
UTF8
.
GetBytes
(
text
)
)
;
/// <summary>
/// Send text to the given endpoint (asynchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="text">Text to send as a span of characters</param>
/// <returns>'true' if the text was successfully sent, 'false' if the text was not sent</returns>
public
virtual
bool
SendAsync
(
EndPoint
endpoint
,
ReadOnlySpan
<
char
>
text
)
=>
SendAsync
(
endpoint
,
Encoding
.
UTF8
.
GetBytes
(
text
.
ToArray
(
)
)
)
;
/// <summary>
/// Receive a new datagram from the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to receive from</param>
/// <param name="buffer">Datagram buffer to receive</param>
/// <returns>Size of received datagram</returns>
public
virtual
long
Receive
(
ref
EndPoint
endpoint
,
byte
[
]
buffer
)
{
return
Receive
(
ref
endpoint
,
buffer
,
0
,
buffer
.
Length
)
;
}
/// <summary>
/// Receive a new datagram from the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to receive from</param>
/// <param name="buffer">Datagram buffer to receive</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>Size of received datagram</returns>
public
virtual
long
Receive
(
ref
EndPoint
endpoint
,
byte
[
]
buffer
,
long
offset
,
long
size
)
{
if
(
!
IsStarted
)
return
0
;
if
(
size
==
0
)
return
0
;
try
{
// Receive datagram from the client
long
received
=
Socket
.
ReceiveFrom
(
buffer
,
(
int
)
offset
,
(
int
)
size
,
SocketFlags
.
None
,
ref
endpoint
)
;
// Update statistic
DatagramsReceived
++
;
BytesReceived
+=
received
;
// Call the datagram received handler
OnReceived
(
endpoint
,
buffer
,
offset
,
size
)
;
return
received
;
}
catch
(
ObjectDisposedException
)
{
return
0
;
}
catch
(
SocketException
ex
)
{
SendError
(
ex
.
SocketErrorCode
)
;
return
0
;
}
}
/// <summary>
/// Receive text from the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to receive from</param>
/// <param name="size">Text size to receive</param>
/// <returns>Received text</returns>
public
virtual
string
Receive
(
ref
EndPoint
endpoint
,
long
size
)
{
var
buffer
=
new
byte
[
size
]
;
var
length
=
Receive
(
ref
endpoint
,
buffer
)
;
return
Encoding
.
UTF8
.
GetString
(
buffer
,
0
,
(
int
)
length
)
;
}
/// <summary>
/// Receive datagram from the client (asynchronous)
/// </summary>
public
virtual
void
ReceiveAsync
(
)
{
// Try to receive datagram
TryReceive
(
)
;
}
/// <summary>
/// Try to receive new data
/// </summary>
private
void
TryReceive
(
)
{
if
(
_receiving
)
return
;
if
(
!
IsStarted
)
return
;
try
{
// Async receive with the receive handler
_receiving
=
true
;
_receiveEventArg
.
RemoteEndPoint
=
_receiveEndpoint
;
_receiveEventArg
.
SetBuffer
(
_receiveBuffer
.
Data
,
0
,
(
int
)
_receiveBuffer
.
Capacity
)
;
if
(
!
Socket
.
ReceiveFromAsync
(
_receiveEventArg
)
)
ProcessReceiveFrom
(
_receiveEventArg
)
;
}
catch
(
ObjectDisposedException
)
{
}
}
/// <summary>
/// Try to send pending data
/// </summary>
private
void
TrySend
(
)
{
if
(
_sending
)
return
;
if
(
!
IsStarted
)
return
;
try
{
// Async write with the write handler
_sending
=
true
;
_sendEventArg
.
RemoteEndPoint
=
_sendEndpoint
;
_sendEventArg
.
SetBuffer
(
_sendBuffer
.
Data
,
0
,
(
int
)
(
_sendBuffer
.
Size
)
)
;
if
(
!
Socket
.
SendToAsync
(
_sendEventArg
)
)
ProcessSendTo
(
_sendEventArg
)
;
}
catch
(
ObjectDisposedException
)
{
}
}
/// <summary>
/// Clear send/receive buffers
/// </summary>
private
void
ClearBuffers
(
)
{
// Clear send buffers
_sendBuffer
.
Clear
(
)
;
// Update statistic
BytesPending
=
0
;
BytesSending
=
0
;
}
#endregion
#region IO processing
/// <summary>
/// This method is called whenever a receive or send operation is completed on a socket
/// </summary>
private
void
OnAsyncCompleted
(
object
sender
,
SocketAsyncEventArgs
e
)
{
if
(
IsSocketDisposed
)
return
;
// Determine which type of operation just completed and call the associated handler
switch
(
e
.
LastOperation
)
{
case
SocketAsyncOperation
.
ReceiveFrom
:
ProcessReceiveFrom
(
e
)
;
break
;
case
SocketAsyncOperation
.
SendTo
:
ProcessSendTo
(
e
)
;
break
;
default
:
throw
new
ArgumentException
(
"The last operation completed on the socket was not a receive or send"
)
;
}
}
/// <summary>
/// This method is invoked when an asynchronous receive from operation completes
/// </summary>
private
void
ProcessReceiveFrom
(
SocketAsyncEventArgs
e
)
{
_receiving
=
false
;
if
(
!
IsStarted
)
return
;
// Check for error
if
(
e
.
SocketError
!=
SocketError
.
Success
)
{
SendError
(
e
.
SocketError
)
;
// Call the datagram received zero handler
OnReceived
(
e
.
RemoteEndPoint
,
_receiveBuffer
.
Data
,
0
,
0
)
;
return
;
}
// Received some data from the client
long
size
=
e
.
BytesTransferred
;
// Update statistic
DatagramsReceived
++
;
BytesReceived
+=
size
;
// Call the datagram received handler
OnReceived
(
e
.
RemoteEndPoint
,
_receiveBuffer
.
Data
,
0
,
size
)
;
// If the receive buffer is full increase its size
if
(
_receiveBuffer
.
Capacity
==
size
)
{
// Check the receive buffer limit
if
(
(
(
2
*
size
)
>
OptionReceiveBufferLimit
)
&&
(
OptionReceiveBufferLimit
>
0
)
)
{
SendError
(
SocketError
.
NoBufferSpaceAvailable
)
;
// Call the datagram received zero handler
OnReceived
(
e
.
RemoteEndPoint
,
_receiveBuffer
.
Data
,
0
,
0
)
;
return
;
}
_receiveBuffer
.
Reserve
(
2
*
size
)
;
}
}
/// <summary>
/// This method is invoked when an asynchronous send to operation completes
/// </summary>
private
void
ProcessSendTo
(
SocketAsyncEventArgs
e
)
{
_sending
=
false
;
if
(
!
IsStarted
)
return
;
// Check for error
if
(
e
.
SocketError
!=
SocketError
.
Success
)
{
SendError
(
e
.
SocketError
)
;
// Call the buffer sent zero handler
OnSent
(
_sendEndpoint
,
0
)
;
return
;
}
long
sent
=
e
.
BytesTransferred
;
// Send some data to the client
if
(
sent
>
0
)
{
// Update statistic
BytesSending
=
0
;
BytesSent
+=
sent
;
// Clear the send buffer
_sendBuffer
.
Clear
(
)
;
// Call the buffer sent handler
OnSent
(
_sendEndpoint
,
sent
)
;
}
}
#endregion
#region Datagram handlers
/// <summary>
/// Handle server starting notification
/// </summary>
protected
virtual
void
OnStarting
(
)
{
}
/// <summary>
/// Handle server started notification
/// </summary>
protected
virtual
void
OnStarted
(
)
{
}
/// <summary>
/// Handle server stopping notification
/// </summary>
protected
virtual
void
OnStopping
(
)
{
}
/// <summary>
/// Handle server stopped notification
/// </summary>
protected
virtual
void
OnStopped
(
)
{
}
/// <summary>
/// Handle datagram received notification
/// </summary>
/// <param name="endpoint">Received endpoint</param>
/// <param name="buffer">Received datagram buffer</param>
/// <param name="offset">Received datagram buffer offset</param>
/// <param name="size">Received datagram buffer size</param>
/// <remarks>
/// Notification is called when another datagram was received from some endpoint
/// </remarks>
protected
virtual
void
OnReceived
(
EndPoint
endpoint
,
byte
[
]
buffer
,
long
offset
,
long
size
)
{
}
/// <summary>
/// Handle datagram sent notification
/// </summary>
/// <param name="endpoint">Endpoint of sent datagram</param>
/// <param name="sent">Size of sent datagram buffer</param>
/// <remarks>
/// Notification is called when a datagram was sent to the client.
/// This handler could be used to send another datagram to the client for instance when the pending size is zero.
/// </remarks>
protected
virtual
void
OnSent
(
EndPoint
endpoint
,
long
sent
)
{
}
/// <summary>
/// Handle error notification
/// </summary>
/// <param name="error">Socket error code</param>
protected
virtual
void
OnError
(
SocketError
error
)
{
}
#endregion
#region Error handling
/// <summary>
/// Send error notification
/// </summary>
/// <param name="error">Socket error code</param>
private
void
SendError
(
SocketError
error
)
{
// Skip disconnect errors
if
(
(
error
==
SocketError
.
ConnectionAborted
)
||
(
error
==
SocketError
.
ConnectionRefused
)
||
(
error
==
SocketError
.
ConnectionReset
)
||
(
error
==
SocketError
.
OperationAborted
)
||
(
error
==
SocketError
.
Shutdown
)
)
return
;
OnError
(
error
)
;
}
#endregion
#region IDisposable implementation
/// <summary>
/// Disposed flag
/// </summary>
public
bool
IsDisposed
{
get
;
private
set
;
}
/// <summary>
/// Server socket disposed flag
/// </summary>
public
bool
IsSocketDisposed
{
get
;
private
set
;
}
=
true
;
// Implement IDisposable.
public
void
Dispose
(
)
{
Dispose
(
true
)
;
GC
.
SuppressFinalize
(
this
)
;
}
protected
virtual
void
Dispose
(
bool
disposingManagedResources
)
{
// The idea here is that Dispose(Boolean) knows whether it is
// being called to do explicit cleanup (the Boolean is true)
// versus being called due to a garbage collection (the Boolean
// is false). This distinction is useful because, when being
// disposed explicitly, the Dispose(Boolean) method can safely
// execute code using reference type fields that refer to other
// objects knowing for sure that these other objects have not been
// finalized or disposed of yet. When the Boolean is false,
// the Dispose(Boolean) method should not execute code that
// refer to reference type fields because those objects may
// have already been finalized."
if
(
!
IsDisposed
)
{
if
(
disposingManagedResources
)
{
// Dispose managed resources here...
Stop
(
)
;
}
// Dispose unmanaged resources here...
// Set large fields to null here...
// Mark as disposed.
IsDisposed
=
true
;
}
}
#endregion
}
}
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