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SynBidirSock.pas
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/// implements bidirectional client and server protocol, e.g. WebSockets
// - this unit is a part of the freeware Synopse mORMot framework,
// licensed under a MPL/GPL/LGPL tri-license; version 1.18
unit SynBidirSock;
{
This file is part of the Synopse framework.
Synopse framework. Copyright (C) 2019 Arnaud Bouchez
Synopse Informatique - https://synopse.info
*** BEGIN LICENSE BLOCK *****
Version: MPL 1.1/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Mozilla Public License Version
1.1 (the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
for the specific language governing rights and limitations under the License.
The Original Code is Synopse mORMot framework.
The Initial Developer of the Original Code is Arnaud Bouchez.
Portions created by the Initial Developer are Copyright (C) 2019
the Initial Developer. All Rights Reserved.
Contributor(s):
- Alfred (alf)
- f-vicente
Alternatively, the contents of this file may be used under the terms of
either the GNU General Public License Version 2 or later (the "GPL"), or
the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the MPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the MPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****
Version 1.18
- first public release, corresponding to mORMot Framework 1.18
TODO: broadcast a message to several aCallingThread: THttpServerResp values
(add TWebSocketClientRequest? or asynch notifications may be enough, and
the "broadcast" feature should be implementation at application level,
using a list of callbacks)
TODO: enhance TWebSocketServer process to use events, and not threads
- current implementation has its threads spending most time waiting in loops
- eventually also at SynCrtSock's THttpServer class level also
}
{$I Synopse.inc} // define HASINLINE USETYPEINFO CPU32 CPU64 OWNNORMTOUPPER
interface
uses
{$ifdef MSWINDOWS}
Windows,
SynWinSock,
{$else}
{$ifdef KYLIX3}
LibC,
Types,
SynFPCSock, // shared with Kylix
SynKylix,
{$endif}
{$ifdef FPC}
SynFPCSock,
SynFPCLinux,
{$endif}
{$endif}
SysUtils,
Classes,
Contnrs,
SyncObjs,
SynLZ,
SynCommons,
SynLog,
SynCrtSock,
SynCrypto,
SynEcc;
{$ifndef DELPHI5OROLDER}
{$ifdef USELOCKERDEBUG}
{.$define WSLOCKERDEBUGLIST}
{.$define WSLOCKERDEBUGPROCESS}
{$endif}
{$endif}
{ -------------- high-level SynCrtSock classes depending on SynCommons }
type
/// in-memory storage of one THttpRequestCached entry
THttpRequestCache = record
Tag: RawUTF8;
Content: RawByteString;
end;
/// in-memory storage of all THttpRequestCached entries
THttpRequestCacheDynArray = array of THttpRequestCache;
/// handles cached HTTP connection to a remote server
// - use in-memory cached content when HTTP_NOTMODIFIED (304) is returned
// for an already known ETAG header value
THttpRequestCached = class(TSynPersistent)
protected
fURI: TURI;
fHttp: THttpRequest; // either fHttp or fSocket is used
fSocket: THttpClientSocket;
fKeepAlive: integer;
fTokenHeader: RawUTF8;
fCache: TSynDictionary;
public
/// initialize the cache for a given server
// - once set, you can change the request URI using the Address property
// - aKeepAliveSeconds = 0 will force "Connection: Close" HTTP/1.0 requests
// - an internal cache will be maintained, and entries will be flushed after
// aTimeoutSeconds - i.e. 15 minutes per default - setting 0 will disable
// the client-side cache content
// - aToken is an optional token which will be transmitted as HTTP header:
// $ Authorization: Bearer <aToken>
// - TWinHttp will be used by default under Windows, unless you specify
// another class
constructor Create(const aURI: RawUTF8; aKeepAliveSeconds: integer=30;
aTimeoutSeconds: integer=15*60; const aToken: RawUTF8='';
aHttpClass: THttpRequestClass=nil); reintroduce;
/// finalize the current connnection and flush its in-memory cache
// - you may use LoadFromURI() to connect to a new server
procedure Clear;
/// connect to a new server
// - aToken is an optional token which will be transmitted as HTTP header:
// $ Authorization: Bearer <aToken>
// - TWinHttp will be used by default under Windows, unless you specify
// another class
function LoadFromURI(const aURI: RawUTF8; const aToken: RawUTF8='';
aHttpClass: THttpRequestClass=nil): boolean;
/// finalize the cache
destructor Destroy; override;
/// retrieve a resource from the server, or internal cache
// - aModified^ = true if server returned a HTTP_SUCCESS (200) with some new
// content, or aModified^ = false if HTTP_NOTMODIFIED (304) was returned
function Get(const aAddress: SockString; aModified: PBoolean=nil;
aStatus: PInteger=nil): SockString;
/// erase one resource from internal cache
function Flush(const aAddress: SockString): boolean;
/// read-only access to the connected server
property URI: TURI read fURI;
end;
{ ------------ client or server asynchronous process of multiple connections }
type
/// exception associated with TAsynchConnection / TAsynchConnections process
EAsynchConnections = class(ESynException);
/// 32-bit integer value used to identify an asynchronous connection
// - will start from 1, and increase during the TAsynchConnections live-time
TAsynchConnectionHandle = type integer;
TAsynchConnections = class;
/// abstract class to store one TAsynchConnections connection
// - may implement e.g. WebSockets frames, or IoT binary protocol
// - each connection will be identified by a TAsynchConnectionHandle integer
// - idea is to minimize the resources used per connection, and allow full
// customization of the process by overriding the OnRead virtual method (and,
// if needed, AfterCreate/AfterWrite/BeforeDestroy/OnLastOperationIdle)
TAsynchConnection = class(TSynPersistent)
protected
fSlot: TPollSocketsSlot;
fHandle: TAsynchConnectionHandle;
fLastOperation: cardinal;
/// this method is called when the instance is connected to a poll
// - default implementation will set fLastOperation content
procedure AfterCreate(Sender: TAsynchConnections); virtual;
/// this method is called when the some input data is pending on the socket
// - should extract frames or requests from fSlot.readbuf, and handle them
// - this is where the input should be parsed and extracted according to
// the implemented procotol
// - Sender.Write() could be used for asynchronous answer sending
// - Sender.LogVerbose() allows logging of escaped data
// - could return sorClose to shutdown the socket, e.g. on parsing error
function OnRead(Sender: TAsynchConnections): TPollAsynchSocketOnRead; virtual; abstract;
/// this method is called when some data has been written to the socket
// - default implementation will do nothing
procedure AfterWrite(Sender: TAsynchConnections); virtual;
/// this method is called when the instance is about to be deleted from a poll
// - default implementation will reset fHandle to 0
procedure BeforeDestroy(Sender: TAsynchConnections); virtual;
// called after TAsynchConnections.LastOperationIdleSeconds of no activity
// - reset fLastOperation by default - overriden code should be fast
// - Sender.Write() could be used to send e.g. a hearbeat frame
procedure OnLastOperationIdle(Sender: TAsynchConnections); virtual;
published
/// read-only access to the handle number associated with this connection
property Handle: TAsynchConnectionHandle read fHandle;
/// read-only access to the socket number associated with this connection
property Socket: TSocket read fSlot.socket;
end;
/// meta-class of one TAsynchConnections connection
TAsynchConnectionClass = class of TAsynchConnection;
/// used to store a dynamic array of TAsynchConnection
TAsynchConnectionObjArray = array of TAsynchConnection;
/// handle multiple non-blocking connections using TAsynchConnection instances
// - OnRead will redirect to TAsynchConnection.OnRead virtual method
// - OnClose will remove the instance from TAsynchConnections.fConnections[]
// - OnError will return false to shutdown the connection (unless
// acoOnErrorContinue is defined in TAsynchConnections.Options)
TAsynchConnectionsSockets = class(TPollAsynchSockets)
protected
fOwner: TAsynchConnections;
function SlotFromConnection(connection: TObject): PPollSocketsSlot; override;
function OnRead(connection: TObject): TPollAsynchSocketOnRead; override;
procedure AfterWrite(connection: TObject); override;
procedure OnClose(connection: TObject); override;
function OnError(connection: TObject; events: TPollSocketEvents): boolean; override;
function GetTotal: integer;
public
/// add some data to the asynchronous output buffer of a given connection
// - this overriden method will refresh TAsynchConnection.LastOperation
// - can be executed from an TAsynchConnection.OnRead method
function Write(connection: TObject; const data; datalen: integer): boolean; override;
published
/// how many clients have been handled by the poll, from the beginning
property Total: integer read GetTotal;
end;
/// used to implement a thread poll to process TAsynchConnection instances
TAsynchConnectionsThread = class(TSynThread)
protected
fOwner: TAsynchConnections;
fProcess: TPollSocketEvent; // pseRead or pseWrite
procedure Execute; override;
public
/// initialize the thread
constructor Create(aOwner: TAsynchConnections; aProcess: TPollSocketEvent); reintroduce;
end;
/// low-level options for TAsynchConnections processing
// - TAsynchConnectionsSockets.OnError will shutdown the connection on any error,
// unless acoOnErrorContinue is defined
// - acoOnAcceptFailureStop will let failed Accept() finalize the process
// - acoNoLogRead and acoNoLogWrite could reduce the log verbosity
// - acoVerboseLog will log transmitted frames content, for debugging purposes
// - acoLastOperationNoRead and acoLastOperationNoWrite could be used to
// avoid TAsynchConnection.fLastOperation reset at read or write
TAsynchConnectionsOptions = set of (acoOnErrorContinue,
acoOnAcceptFailureStop, acoNoLogRead, acoNoLogWrite, acoVerboseLog,
acoLastOperationNoRead, acoLastOperationNoWrite);
/// implements an abstract thread-pooled high-performance TCP clients or server
// - internal TAsynchConnectionsSockets will handle high-performance process
// of a high number of long-living simultaneous connections
// - will use a TAsynchConnection inherited class to maintain connection state
// - don't use this abstract class but either TAsynchServer or TAsynchClients
// - under Linux/POSIX, check your "ulimit -H -n" value: one socket consumes
// two file descriptors: you may better add the following line to your
// /etc/limits.conf or /etc/security/limits.conf system file:
// $ * hard nofile 65535
TAsynchConnections = class(TServerGeneric)
protected
fStreamClass: TAsynchConnectionClass;
fConnection: TAsynchConnectionObjArray;
fConnectionCount: integer;
fConnections: TDynArray; // fConnection[] sorted by TAsynchConnection.Handle
fClients: TAsynchConnectionsSockets;
fThreads: array of TAsynchConnectionsThread;
fLastHandle: integer;
fLog: TSynLogClass;
fTempConnection: TAsynchConnection;
fOptions: TAsynchConnectionsOptions;
fLastOperationIdleSeconds: cardinal;
fThreadClients: record // used by TAsynchClient
Count, Timeout: integer;
Address, Port: SockString;
end;
fConnectionLock: TSynLocker;
procedure IdleEverySecond;
function ConnectionCreate(aSocket: TSocket; out aConnection: TAsynchConnection): boolean; virtual;
function ConnectionAdd(aSocket: TSocket; aConnection: TAsynchConnection): boolean; virtual;
function ConnectionDelete(aHandle: TAsynchConnectionHandle): boolean; overload; virtual;
function ConnectionDelete(aConnection: TAsynchConnection; aIndex: integer): boolean; overload;
procedure ThreadClientsConnect; // from fThreadClients
public
/// initialize the multiple connections
// - warning: currently reliable only with aThreadPoolCount=1
constructor Create(OnStart,OnStop: TNotifyThreadEvent;
aStreamClass: TAsynchConnectionClass; const ProcessName: SockString;
aLog: TSynLogClass; aOptions: TAsynchConnectionsOptions; aThreadPoolCount: integer); reintroduce; virtual;
/// shut down the instance, releasing all associated threads and sockets
destructor Destroy; override;
/// high-level access to a connection instance, from its handle
// - could be executed e.g. from a TAsynchConnection.OnRead method
// - returns nil if the handle was not found
// - returns the maching instance, and caller should release the lock as:
// ! try ... finally UnLock; end;
function ConnectionFindLocked(aHandle: TAsynchConnectionHandle;
aIndex: PInteger=nil): TAsynchConnection;
/// just a wrapper around fConnectionLock.Lock
procedure Lock;
/// just a wrapper around fConnectionLock.UnLock
procedure Unlock;
/// remove an handle from the internal list, and close its connection
// - could be executed e.g. from a TAsynchConnection.OnRead method
function ConnectionRemove(aHandle: TAsynchConnectionHandle): boolean;
/// add some data to the asynchronous output buffer of a given connection
// - could be executed e.g. from a TAsynchConnection.OnRead method
function Write(connection: TAsynchConnection; const data; datalen: integer): boolean; overload;
/// add some data to the asynchronous output buffer of a given connection
// - could be executed e.g. from a TAsynchConnection.OnRead method
function Write(connection: TAsynchConnection; const data: SockString): boolean; overload;
/// log some binary data with proper escape
// - can be executed from an TAsynchConnection.OnRead method to track content:
// $ if acoVerboseLog in Sender.Options then Sender.LogVerbose(self,...);
procedure LogVerbose(connection: TAsynchConnection; const ident: RawUTF8;
frame: pointer; framelen: integer); overload;
/// log some binary data with proper escape
// - can be executed from an TAsynchConnection.OnRead method to track content:
// $ if acoVerboseLog in Sender.Options then Sender.LogVerbose(...);
procedure LogVerbose(connection: TAsynchConnection; const ident: RawUTF8;
const frame: RawByteString); overload;
/// will execute TAsynchConnection.OnLastOperationIdle after an idle period
// - could be used to send heartbeats after read/write inactivity
// - equals 0 (i.e. disabled) by default
property LastOperationIdleSeconds: cardinal read fLastOperationIdleSeconds
write fLastOperationIdleSeconds;
/// allow to customize low-level options for processing
property Options: TAsynchConnectionsOptions read fOptions write fOptions;
/// access to the associated log class
property Log: TSynLogClass read fLog;
/// low-level unsafe direct access to the connection instances
// - ensure this property is used in a thread-safe manner, i.e. via
// ! Lock; try ... finally UnLock; end;
property Connection: TAsynchConnectionObjArray read fConnection;
/// low-level unsafe direct access to the connection count
// - ensure this property is used in a thread-safe manner, i.e. via
// ! Lock; try ... finally UnLock; end;
property ConnectionCount: integer read fConnectionCount;
published
/// access to the TCP client sockets poll
// - TAsynchConnection.OnRead should rather use Write() and LogVerbose()
// methods of this TAsynchConnections class instead of using Clients
property Clients: TAsynchConnectionsSockets read fClients;
end;
/// implements a thread-pooled high-performance TCP server
// - will use a TAsynchConnection inherited class to maintain connection state
// for server process
TAsynchServer = class(TAsynchConnections)
protected
fServer: TCrtSocket;
procedure Execute; override;
public
/// run the TCP server, listening on a supplied IP port
constructor Create(const aPort: SockString; OnStart,OnStop: TNotifyThreadEvent;
aStreamClass: TAsynchConnectionClass; const ProcessName: SockString;
aLog: TSynLogClass; aOptions: TAsynchConnectionsOptions; aThreadPoolCount: integer=1); reintroduce; virtual;
/// shut down the server, releasing all associated threads and sockets
destructor Destroy; override;
published
/// access to the TCP server socket
property Server: TCrtSocket read fServer;
end;
/// implements thread-pooled high-performance TCP multiple clients
// - e.g. to run some load stress tests with optimized resource use
// - will use a TAsynchConnection inherited class to maintain connection state
// of each connected client
TAsynchClient = class(TAsynchConnections)
protected
procedure Execute; override;
public
/// start the TCP client connections, connecting to the supplied IP server
constructor Create(const aServer,aPort: SockString;
aClientsCount,aClientsTimeoutSecs: integer; OnStart,OnStop: TNotifyThreadEvent;
aStreamClass: TAsynchConnectionClass; const ProcessName: SockString;
aLog: TSynLogClass; aOptions: TAsynchConnectionsOptions; aThreadPoolCount: integer=1); reintroduce; virtual;
published
/// server IP address
property Server: SockString read fThreadClients.Address;
/// server IP port
property Port: SockString read fThreadClients.Port;
end;
{ -------------- WebSockets shared classes for bidirectional remote access }
type
/// Exception raised when processing WebSockets
EWebSockets = class(ESynException);
/// defines the interpretation of the WebSockets frame data
// - match order expected by the WebSockets RFC
TWebSocketFrameOpCode = (
focContinuation, focText, focBinary,
focReserved3, focReserved4, focReserved5, focReserved6, focReserved7,
focConnectionClose, focPing, focPong,
focReservedB, focReservedC, focReservedD, focReservedE, focReservedF);
/// set of WebSockets frame interpretation
TWebSocketFrameOpCodes = set of TWebSocketFrameOpCode;
/// define one attribute of a WebSockets frame data
TWebSocketFramePayload = (
fopAlreadyCompressed);
/// define the attributes of a WebSockets frame data
TWebSocketFramePayloads = set of TWebSocketFramePayload;
/// stores a WebSockets frame
// - see @http://tools.ietf.org/html/rfc6455 for reference
TWebSocketFrame = record
/// the interpretation of the frame data
opcode: TWebSocketFrameOpCode;
/// what is stored in the frame data, i.e. in payload field
content: TWebSocketFramePayloads;
/// internal tick count used for TWebSocketFrameList storage timeout
tix: cardinal;
/// the frame data itself
// - is plain UTF-8 for focText kind of frame
// - is raw binary for focBinary or any other frames
payload: RawByteString;
end;
/// points to a WebSockets frame
PWebSocketFrame = ^TWebSocketFrame;
/// a dynamic list of WebSockets frames
TWebSocketFrameDynArray = array of TWebSocketFrame;
{$M+}
TWebSocketProcess = class;
{$M-}
/// handle an application-level WebSockets protocol
// - shared by TWebSocketServer and TWebSocketClient classes
// - once upgraded to WebSockets, a HTTP link could be used e.g. to transmit our
// proprietary 'synopsejson' or 'synopsebin' application content, as stated
// by this typical handshake:
// $ GET /myservice HTTP/1.1
// $ Host: server.example.com
// $ Upgrade: websocket
// $ Connection: Upgrade
// $ Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==
// $ Sec-WebSocket-Protocol: synopsejson
// $ Sec-WebSocket-Version: 13
// $ Origin: http://example.com
// $
// $ HTTP/1.1 101 Switching Protocols
// $ Upgrade: websocket
// $ Connection: Upgrade
// $ Sec-WebSocket-Accept: HSmrc0sMlYUkAGmm5OPpG2HaGWk=
// $ Sec-WebSocket-Protocol: synopsejson
// - the TWebSocketProtocolJSON inherited class will implement
// $ Sec-WebSocket-Protocol: synopsejson
// - the TWebSocketProtocolBinary inherited class will implement
// $ Sec-WebSocket-Protocol: synopsebin
TWebSocketProtocol = class(TSynPersistent)
protected
fName: RawUTF8;
fURI: RawUTF8;
fFramesInCount: integer;
fFramesInBytes: QWord;
fFramesOutCount: integer;
fFramesOutBytes: QWord;
fRemoteIP: SockString;
fRemoteLocalhost: boolean;
fLastError: string;
fEncryption: IProtocol;
function ProcessHandshake(const ExtIn: TRawUTF8DynArray; out ExtOut: RawUTF8;
ErrorMsg: PRawUTF8): boolean; virtual;
function ProcessURI(const aClientURI: RawUTF8): boolean; virtual; // e.g. for authentication
// focText/focBinary or focContinuation/focConnectionClose from ProcessStart/ProcessStop
procedure ProcessIncomingFrame(Sender: TWebSocketProcess;
var request: TWebSocketFrame; const info: RawUTF8); virtual; abstract;
function SendFrames(Owner: TWebSocketProcess;
var Frames: TWebSocketFrameDynArray; var FramesCount: integer): boolean; virtual;
procedure AfterGetFrame(var frame: TWebSocketFrame); virtual;
procedure BeforeSendFrame(var frame: TWebSocketFrame); virtual;
function FrameData(const frame: TWebSocketFrame; const Head: RawUTF8;
HeadFound: PRawUTF8=nil): pointer; virtual;
function FrameType(const frame: TWebSocketFrame): RawUTF8; virtual;
function GetRemoteIP: SockString;
function GetEncrypted: boolean;
function GetSubprotocols: RawUTF8; virtual; // e.g. 'synopsebin, synopsebinary'
function SetSubprotocol(const aProtocolName: RawUTF8): boolean; virtual;
public
/// abstract constructor to initialize the protocol
// - the protocol should be named, so that the client may be able to request
// for a given protocol
// - if aURI is '', any URI would potentially upgrade to this protocol; you can
// specify an URI to limit the protocol upgrade to a single resource
constructor Create(const aName,aURI: RawUTF8); reintroduce;
/// compute a new instance of the WebSockets protocol, with same parameters
function Clone(const aClientURI: RawUTF8): TWebSocketProtocol; virtual; abstract;
published
/// the Sec-WebSocket-Protocol application name currently involved
// - e.g. 'synopsejson', 'synopsebin' or 'synopsebinary'
property Name: RawUTF8 read fName;
/// the optional URI on which this protocol would be enabled
// - leave to '' if any URI should match
property URI: RawUTF8 read fURI;
/// the associated 'Remote-IP' HTTP header value
// - returns '' if RemoteLocalhost=true
property RemoteIP: SockString read GetRemoteIP;
/// the last error message, during frame processing
property LastError: string read fLastError;
/// returns TRUE if encryption is enabled during the transmission
// - is currently only available for TWebSocketProtocolBinary
property Encrypted: boolean read GetEncrypted;
/// how many frames have been received by this instance
property FramesInCount: integer read fFramesInCount;
/// how many frames have been sent by this instance
property FramesOutCount: integer read fFramesOutCount;
/// how many (uncompressed) bytes have been received by this instance
property FramesInBytes: QWord read fFramesInBytes;
/// how many (uncompressed) bytes have been sent by this instance
property FramesOutBytes: QWord read fFramesOutBytes;
end;
/// callback event triggered by TWebSocketProtocolChat for any incoming message
// - a first call with frame.opcode=focContinuation will take place when
// the connection will be upgraded to WebSockets
// - then any incoming focText/focBinary events will trigger this callback
// - eventually, a focConnectionClose will notify the connection ending
TOnWebSocketProtocolChatIncomingFrame =
procedure(Sender: THttpServerResp; const Frame: TWebSocketFrame) of object;
/// simple chatting protocol, allowing to receive and send WebSocket frames
// - you can use this protocol to implement simple asynchronous communication
// with events expecting no answers, e.g. with AJAX applications
// - see TWebSocketProtocolRest for bi-directional events expecting answers
TWebSocketProtocolChat = class(TWebSocketProtocol)
protected
fOnIncomingFrame: TOnWebSocketProtocolChatIncomingFrame;
procedure ProcessIncomingFrame(Sender: TWebSocketProcess;
var request: TWebSocketFrame; const info: RawUTF8); override;
public
/// initialize the chat protocol with an incoming frame callback
constructor Create(const aName,aURI: RawUTF8;
const aOnIncomingFrame: TOnWebSocketProtocolChatIncomingFrame); overload;
/// compute a new instance of the WebSockets protocol, with same parameters
function Clone(const aClientURI: RawUTF8): TWebSocketProtocol; override;
/// on the server side, allows to send a message over the wire to a
// specified client connection
function SendFrame(Sender: THttpServerResp; const Frame: TWebSocketFrame): boolean;
/// on the server side, allows to send a JSON message over the wire to a
// specified client connection
// - the supplied JSON content is supplied as "var", since it may be
// modified during execution, e.g. XORed for frame masking
function SendFrameJson(Sender: THttpServerResp; var JSON: RawUTF8): boolean;
/// you can assign an event to this property to be notified of incoming messages
property OnIncomingFrame: TOnWebSocketProtocolChatIncomingFrame
read fOnIncomingFrame write fOnIncomingFrame;
end;
/// handle a REST application-level bi-directional WebSockets protocol
// - will emulate a bi-directional REST process, using THttpServerRequest to
// store and handle the request parameters: clients would be able to send
// regular REST requests to the server, but the server could use the same
// communication channel to push REST requests to the client
// - a local THttpServerRequest will be used on both client and server sides,
// to store REST parameters and compute the corresponding WebSockets frames
TWebSocketProtocolRest = class(TWebSocketProtocol)
protected
fSequencing: boolean;
fSequence: integer;
procedure ProcessIncomingFrame(Sender: TWebSocketProcess;
var request: TWebSocketFrame; const info: RawUTF8); override;
procedure FrameCompress(const Head: RawUTF8; const Values: array of const;
const Content,ContentType: RawByteString; var frame: TWebSocketFrame); virtual; abstract;
function FrameDecompress(const frame: TWebSocketFrame; const Head: RawUTF8;
const values: array of PRawByteString; var contentType,content: RawByteString): Boolean; virtual; abstract;
/// convert the input information of REST request to a WebSocket frame
procedure InputToFrame(Ctxt: THttpServerRequest; aNoAnswer: boolean;
out request: TWebSocketFrame; out head: RawUTF8); virtual;
/// convert a WebSocket frame to the input information of a REST request
function FrameToInput(var request: TWebSocketFrame; out aNoAnswer: boolean;
Ctxt: THttpServerRequest): boolean; virtual;
/// convert a WebSocket frame to the output information of a REST request
function FrameToOutput(var answer: TWebSocketFrame; Ctxt: THttpServerRequest): cardinal; virtual;
/// convert the output information of REST request to a WebSocket frame
procedure OutputToFrame(Ctxt: THttpServerRequest; Status: Cardinal;
var outhead: RawUTF8; out answer: TWebSocketFrame); virtual;
end;
/// used to store the class of a TWebSocketProtocol type
TWebSocketProtocolClass = class of TWebSocketProtocol;
/// handle a REST application-level WebSockets protocol using JSON for transmission
// - could be used e.g. for AJAX or non Delphi remote access
// - this class will implement then following application-level protocol:
// $ Sec-WebSocket-Protocol: synopsejson
TWebSocketProtocolJSON = class(TWebSocketProtocolRest)
protected
procedure FrameCompress(const Head: RawUTF8; const Values: array of const;
const Content,ContentType: RawByteString; var frame: TWebSocketFrame); override;
function FrameDecompress(const frame: TWebSocketFrame; const Head: RawUTF8;
const values: array of PRawByteString; var contentType,content: RawByteString): Boolean; override;
function FrameData(const frame: TWebSocketFrame; const Head: RawUTF8;
HeadFound: PRawUTF8=nil): pointer; override;
function FrameType(const frame: TWebSocketFrame): RawUTF8; override;
public
/// initialize the WebSockets JSON protocol
// - if aURI is '', any URI would potentially upgrade to this protocol; you can
// specify an URI to limit the protocol upgrade to a single resource
constructor Create(const aURI: RawUTF8); reintroduce;
/// compute a new instance of the WebSockets protocol, with same parameters
function Clone(const aClientURI: RawUTF8): TWebSocketProtocol; override;
end;
/// handle a REST application-level WebSockets protocol using compressed and
// optionally AES-CFB encrypted binary
// - this class will implement then following application-level protocol:
// $ Sec-WebSocket-Protocol: synopsebin
// or fallback to the previous subprotocol
// $ Sec-WebSocket-Protocol: synopsebinary
// - 'synopsebin' will expect requests as 'r000001','r000002',...
// headers matching 'a000001','a000002',... instead of 'request'/'answer'
TWebSocketProtocolBinary = class(TWebSocketProtocolRest)
protected
fCompressed: boolean;
fFramesInBytesSocket: QWord;
fFramesOutBytesSocket: QWord;
procedure FrameCompress(const Head: RawUTF8; const Values: array of const;
const Content,ContentType: RawByteString; var frame: TWebSocketFrame); override;
function FrameDecompress(const frame: TWebSocketFrame; const Head: RawUTF8;
const values: array of PRawByteString; var contentType,content: RawByteString): Boolean; override;
procedure AfterGetFrame(var frame: TWebSocketFrame); override;
procedure BeforeSendFrame(var frame: TWebSocketFrame); override;
function FrameData(const frame: TWebSocketFrame; const Head: RawUTF8;
HeadFound: PRawUTF8=nil): pointer; override;
function FrameType(const frame: TWebSocketFrame): RawUTF8; override;
function SendFrames(Owner: TWebSocketProcess;
var Frames: TWebSocketFrameDynArray; var FramesCount: integer): boolean; override;
procedure ProcessIncomingFrame(Sender: TWebSocketProcess;
var request: TWebSocketFrame; const info: RawUTF8); override;
function GetFramesInCompression: integer;
function GetFramesOutCompression: integer;
function ProcessHandshake(const ExtIn: TRawUTF8DynArray; out ExtOut: RawUTF8;
ErrorMsg: PRawUTF8): boolean; override;
function GetSubprotocols: RawUTF8; override;
function SetSubprotocol(const aProtocolName: RawUTF8): boolean; override;
public
/// initialize the WebSockets binary protocol with no encryption
// - if aURI is '', any URI would potentially upgrade to this protocol; you
// can specify an URI to limit the protocol upgrade to a single resource
// - SynLZ compression is enabled by default, unless aCompressed is false
constructor Create(const aURI: RawUTF8; aCompressed: boolean=true); reintroduce; overload; virtual;
/// initialize the WebSockets binary protocol with a symmetric AES key
// - if aURI is '', any URI would potentially upgrade to this protocol; you
// can specify an URI to limit the protocol upgrade to a single resource
// - if aKeySize if 128, 192 or 256, TProtocolAES (i.e. AES-CFB encryption)
// will be used to secure the transmission
// - SynLZ compression is enabled by default, unless aCompressed is false
constructor Create(const aURI: RawUTF8; const aKey; aKeySize: cardinal;
aCompressed: boolean=true); reintroduce; overload;
/// initialize the WebSockets binary protocol from a textual key
// - if aURI is '', any URI would potentially upgrade to this protocol; you
// can specify an URI to limit the protocol upgrade to a single resource
// - will create a TProtocolAES or TECDHEProtocol instance, corresponding to
// the supplied aKey and aServer values, to secure the transmission using
// a symmetric or assymetric algorithm
// - SynLZ compression is enabled by default, unless aCompressed is false
constructor Create(const aURI: RawUTF8; aServer: boolean; const aKey: RawUTF8;
aCompressed: boolean=true); reintroduce; overload;
/// compute a new instance of the WebSockets protocol, with same parameters
function Clone(const aClientURI: RawUTF8): TWebSocketProtocol; override;
published
/// defines if SynLZ compression is enabled during the transmission
// - is set to TRUE by default
property Compressed: boolean read fCompressed write fCompressed;
/// how many bytes have been received by this instance from the wire
property FramesInBytesSocket: QWord read fFramesInBytesSocket;
/// how many bytes have been sent by this instance to the wire
property FramesOutBytesSocket: QWord read fFramesOutBytesSocket;
/// compression ratio of frames received by this instance
property FramesInCompression: integer read GetFramesInCompression;
/// compression ratio of frames Sent by this instance
property FramesOutCompression: integer read GetFramesOutCompression;
end;
/// used to maintain a list of websocket protocols (for the server side)
TWebSocketProtocolList = class(TSynPersistentLocked)
protected
fProtocols: array of TWebSocketProtocol;
// caller should make fSafe.Lock/UnLock
function FindIndex(const aName,aURI: RawUTF8): integer;
public
/// add a protocol to the internal list
// - returns TRUE on success
// - if this protocol is already existing for this given name and URI,
// returns FALSE: it is up to the caller to release aProtocol if needed
function Add(aProtocol: TWebSocketProtocol): boolean;
/// add once a protocol to the internal list
// - if this protocol is already existing for this given name and URI, any
// previous one will be released - so it may be confusing on a running server
// - returns TRUE if the protocol was added for the first time, or FALSE
// if the protocol has been replaced or is invalid (e.g. aProtocol=nil)
function AddOnce(aProtocol: TWebSocketProtocol): boolean;
/// erase a protocol from the internal list, specified by its name
function Remove(const aProtocolName,aURI: RawUTF8): boolean;
/// finalize the list storage
destructor Destroy; override;
/// create a new protocol instance, from the internal list
function CloneByName(const aProtocolName, aClientURI: RawUTF8): TWebSocketProtocol;
/// create a new protocol instance, from the internal list
function CloneByURI(const aClientURI: RawUTF8): TWebSocketProtocol;
/// how many protocols are stored
function Count: integer;
end;
/// indicates which kind of process did occur in the main WebSockets loop
TWebSocketProcessOne = (
wspNone, wspPing, wspDone, wspAnswer, wspError, wspClosed);
/// indicates how TWebSocketProcess.NotifyCallback() will work
TWebSocketProcessNotifyCallback = (
wscBlockWithAnswer, wscBlockWithoutAnswer, wscNonBlockWithoutAnswer);
/// used to manage a thread-safe list of WebSockets frames
TWebSocketFrameList = class(TSynPersistent)
protected
fTimeoutSec: cardinal;
procedure Delete(i: integer);
public
/// low-level access to the WebSocket frames list
List: TWebSocketFrameDynArray;
/// current number of WebSocket frames in the list
Count: integer;
/// the mutex associated with this resource
// - here we use TAutoLocker and not IAutoLocker for Delphi 5 compatibility
Safe: TAutoLocker;
/// initialize the list
constructor Create(const identifier: RawUTF8; timeoutsec: integer); reintroduce;
/// finalize the list
destructor Destroy; override;
/// add a WebSocket frame in the list
// - this method is thread-safe
procedure Push(const frame: TWebSocketFrame);
/// add a void WebSocket frame in the list
// - this method is thread-safe
procedure PushVoidFrame(opcode: TWebSocketFrameOpCode);
/// retrieve a WebSocket frame from the list, oldest first
// - you should specify a frame type to search for, according to the
// specified WebSockets protocl
// - this method is thread-safe
function Pop(protocol: TWebSocketProtocol;
const head: RawUTF8; out frame: TWebSocketFrame): boolean;
/// how many 'answer' frames are to be ignored
// - this method is thread-safe
function AnswerToIgnore(incr: integer=0): integer;
end;
/// parameters to be used for WebSockets process
{$ifdef UNICODE}TWebSocketProcessSettings = record{$else}TWebSocketProcessSettings = object{$endif}
public
/// time in milli seconds between each focPing commands sent to the other end
// - default is 0, i.e. no automatic ping sending on client side, and
// 20000, i.e. 20 seconds, on server side
HeartbeatDelay: cardinal;
/// maximum period time in milli seconds when ProcessLoop thread will stay
// idle before checking for the next pending requests
// - default is 500 ms, but you may put a lower value, if you expects e.g.
// REST commands or NotifyCallback(wscNonBlockWithoutAnswer) to be processed
// with a lower delay
LoopDelay: cardinal;
/// will close the connection after a given number of invalid Heartbeat sent
// - when a Hearbeat is failed to be transmitted, the class will start
// counting how many ping/pong did fail: when this property value is
// reached, it will release and close the connection
// - default value is 5
DisconnectAfterInvalidHeartbeatCount: cardinal;
/// how many milliseconds the callback notification should wait acquiring
// the connection before failing
// - defaut is 5000, i.e. 5 seconds
CallbackAcquireTimeOutMS: cardinal;
/// how many milliseconds the callback notification should wait for the
// client to return its answer
// - defaut is 30000, i.e. 30 seconds
CallbackAnswerTimeOutMS: cardinal;
/// callback run when a WebSockets client is just connected
// - triggerred by TWebSocketProcess.ProcessStart
OnClientConnected: TNotifyEvent;
/// callback run when a WebSockets client is just disconnected
// - triggerred by TWebSocketProcess.ProcessStop
OnClientDisconnected: TNotifyEvent;
/// by default, contains [] to minimize the logged information
// - set logHeartbeat if you want the ping/pong frames to be logged
// - set logTextFrameContent if you want the text frame content to be logged
// - set logBinaryFrameContent if you want the binary frame content to be logged
// - used only if WebSocketLog global variable is set to a TSynLog class
LogDetails: set of (logHeartbeat,logTextFrameContent,logBinaryFrameContent);
/// will set the default values
procedure SetDefaults;
/// will set LogDetails to its highest level of verbosity
// - used only if WebSocketLog global variable is set
procedure SetFullLog;
end;
/// points to parameters to be used for WebSockets process
// - using a pointer/reference type will allow in-place modification of
// any TWebSocketProcess.Settings, TWebSocketServer.Settings or
// THttpClientWebSockets.Settings property
PWebSocketProcessSettings = ^TWebSocketProcessSettings;
/// the current state of the WebSockets process
TWebSocketProcessState = (wpsCreate,wpsRun,wpsClose,wpsDestroy);
/// abstract WebSockets process, used on both client or server sides
// - GetFrame/SendFrame abstract methods should be overriden with actual
// communication, and fState and ProcessStart/ProcessStop should be updated
// from the actual processing thread (e.g. as in TWebCrtSocketProcess)
TWebSocketProcess = class(TSynPersistent)
protected
fProcessName: RawUTF8;
fIncoming: TWebSocketFrameList;
fOutgoing: TWebSocketFrameList;
fOwnerThread: TSynThread;
fOwnerConnection: Int64;
fState: TWebSocketProcessState;
fProtocol: TWebSocketProtocol;
fMaskSentFrames: byte;
fSettings: TWebSocketProcessSettings;
fProcessCount: integer;
fProcessEnded: boolean;
fNoConnectionCloseAtDestroy: boolean;
fSafeIn, fSafeOut: TAutoLocker; // not IAutoLocker for Delphi5
/// methods run e.g. by TWebSocketServerRest.WebSocketProcessLoop
procedure ProcessStart; virtual;
procedure ProcessStop; virtual;
function ComputeContext(out RequestProcess: TOnHttpServerRequest): THttpServerRequest; virtual; abstract;
procedure HiResDelay(const start: Int64);
procedure Log(const frame: TWebSocketFrame; const aMethodName: RawUTF8;
aEvent: TSynLogInfo=sllTrace; DisableRemoteLog: Boolean=false); virtual;
function SendPendingOutgoingFrames: boolean;
public
/// initialize the WebSockets process on a given connection
// - the supplied TWebSocketProtocol will be owned by this instance
// - other parameters should reflect the client or server expectations
constructor Create(aProtocol: TWebSocketProtocol; aOwnerConnection: Int64;
aOwnerThread: TSynThread; const aSettings: TWebSocketProcessSettings;
const aProcessName: RawUTF8); reintroduce;
/// finalize the context
// - will release the TWebSocketProtocol associated instance
destructor Destroy; override;
/// abstract low level incoming WebSockets framing protocol -> to be overriden
function GetFrame(out Frame: TWebSocketFrame; TimeOut: cardinal;
ErrorWithoutException: PInteger): boolean; virtual; abstract;
/// abstract low level outgoing WebSockets framing protocol -> to be overriden
// - use Outgoing.Push() to send frames asynchronously
function SendFrame(var Frame: TWebSocketFrame): boolean; virtual; abstract;
/// will push a request or notification to the other end of the connection
// - caller should set the aRequest with the outgoing parameters, and
// optionally receive a response from the other end
// - the request may be sent in blocking or non blocking mode
// - returns the HTTP Status code (e.g. HTTP_SUCCESS=200 for success)
function NotifyCallback(aRequest: THttpServerRequest;
aMode: TWebSocketProcessNotifyCallback): cardinal; virtual;
/// the settings currently used during the WebSockets process
// - defined as a pointer so that you may be able to change the values
function Settings: PWebSocketProcessSettings; {$ifdef HASINLINE}inline;{$endif}
/// returns the current state of the underlying connection
function State: TWebSocketProcessState;
/// direct access to the low-level incoming frame stack
property Incoming: TWebSocketFrameList read fIncoming;
/// direct access to the low-level outgoing frame stack
// - call Outgoing.Push() to send frames asynchronously, with optional
// jumboframe gathering (if supported by the protocol)
property Outgoing: TWebSocketFrameList read fOutgoing;
/// the associated low-level processing thread
property OwnerThread: TSynThread read fOwnerThread;
/// the associated low-level WebSocket connection opaque identifier
property OwnerConnection: Int64 read fOwnerConnection;
/// how many frames are currently processed by this connection
property ProcessCount: integer read fProcessCount;
/// may be set to TRUE before Destroy to force raw socket disconnection
property NoConnectionCloseAtDestroy: boolean
read fNoConnectionCloseAtDestroy write fNoConnectionCloseAtDestroy;
published
/// the Sec-WebSocket-Protocol application protocol currently involved
// - TWebSocketProtocolJSON or TWebSocketProtocolBinary in the mORMot context
// - could be nil if the connection is in standard HTTP/1.1 mode
property Protocol: TWebSocketProtocol read fProtocol;
/// the associated process name
property ProcessName: RawUTF8 read fProcessName write fProcessName;
end;
/// TCrtSocket-based WebSockets process, used on both client or server sides
// - will use the socket in blocking mode, so expects its own processing thread
TWebCrtSocketProcess = class(TWebSocketProcess)
protected
fSocket: TCrtSocket;
fLastSocketTicks: Int64;
fInvalidPingSendCount: cardinal;
fSafePing: TAutoLocker; // not IAutoLocker for Delphi5
function LastPingDelay: Int64;
procedure SetLastPingTicks(invalidPing: boolean=false);
// called by the thread handling the TCrtSocket processing
procedure ProcessLoop;
public
/// initialize the WebSockets process on a given TCrtSocket connection
// - the supplied TWebSocketProtocol will be owned by this instance
// - other parameters should reflect the client or server expectations
constructor Create(aSocket: TCrtSocket; aProtocol: TWebSocketProtocol;
aOwnerConnection: Int64; aOwnerThread: TSynThread;
const aSettings: TWebSocketProcessSettings;
const aProcessName: RawUTF8); reintroduce; virtual;
/// finalize the WebSockets process context
destructor Destroy; override;
/// low level incoming WebSockets framing protocol over TCrtSocket
function GetFrame(out Frame: TWebSocketFrame; TimeOut: cardinal;
ErrorWithoutException: PInteger): boolean; override;
/// low level outgoing WebSockets framing protocol over TCrtSocket
function SendFrame(var Frame: TWebSocketFrame): boolean; override;
/// the associated communication socket
// - on the server side, is a THttpServerSocket
// - access to this instance is protected by Safe.Lock/Unlock
property Socket: TCrtSocket read fSocket;
published
/// how many invalid heartbeat frames have been sent
// - a non 0 value indicates a connection problem
property InvalidPingSendCount: cardinal read fInvalidPingSendCount;
end;
{ -------------- WebSockets Server classes for bidirectional remote access }
type
{$M+}
TWebSocketServerResp = class;
{$M-}
/// implements WebSockets process as used on server side
TWebSocketProcessServer = class(TWebCrtSocketProcess)
protected
fServerResp: TWebSocketServerResp;
function ComputeContext(out RequestProcess: TOnHttpServerRequest): THttpServerRequest; override;
end;
/// an enhanced input/output structure used for HTTP and WebSockets requests
// - this class will contain additional parameters used to maintain the
// WebSockets execution context in overriden TWebSocketServer.Process method
TWebSocketServerResp = class(THttpServerResp)
protected
fProcess: TWebSocketProcessServer;
public
/// initialize the context, associated to a HTTP/WebSockets server instance
constructor Create(aServerSock: THttpServerSocket; aServer: THttpServer); override;
/// push a notification to the client
function NotifyCallback(Ctxt: THttpServerRequest; aMode: TWebSocketProcessNotifyCallback): cardinal; virtual;
/// the Sec-WebSocket-Protocol application protocol currently involved
// - TWebSocketProtocolJSON or TWebSocketProtocolBinary in the mORMot context
// - could be nil if the connection is in standard HTTP/1.1 mode
function WebSocketProtocol: TWebSocketProtocol;
end;
/// main HTTP/WebSockets server Thread using the standard Sockets API (e.g. WinSock)
// - once upgraded to WebSockets from the client, this class is able to serve
// any Sec-WebSocket-Protocol application content
TWebSocketServer = class(THttpServer)
protected
fWebSocketConnections: TObjectListLocked;
fProtocols: TWebSocketProtocolList;
fSettings: TWebSocketProcessSettings;
/// will validate the WebSockets handshake, then call WebSocketProcessLoop()
function WebSocketProcessUpgrade(ClientSock: THttpServerSocket;
Context: TWebSocketServerResp): integer; virtual;
/// overriden method which will recognize the WebSocket protocol handshake,
// then run the whole bidirectional communication in its calling thread
// - here aCallingThread is a THttpServerResp, and ClientSock.Headers
// and ConnectionUpgrade properties should be checked for the handshake
procedure Process(ClientSock: THttpServerSocket;
ConnectionID: integer; ConnectionThread: TSynThread); override;
/// identifies an incoming THttpServerResp as a valid TWebSocketServerResp
function IsActiveWebSocket(ConnectionID: integer): TWebSocketServerResp; overload;
function IsActiveWebSocket(ConnectionThread: TSynThread): TWebSocketServerResp; overload;
public
/// create a Server Thread, binded and listening on a port
// - this constructor will raise a EHttpServer exception if binding failed
// - expects the port to be specified as string, e.g. '1234'; you can
// optionally specify a server address to bind to, e.g. '1.2.3.4:1234'