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src/AsyncWebSocket.h
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357
src/AsyncWebSocket.h
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/*
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Asynchronous WebServer library for Espressif MCUs
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Copyright (c) 2016 Hristo Gochkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef ASYNCWEBSOCKET_H_
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#define ASYNCWEBSOCKET_H_
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#include <Arduino.h>
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#ifdef ESP32
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#include <AsyncTCP.h>
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#define WS_MAX_QUEUED_MESSAGES 32
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#else
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#include <ESPAsyncTCP.h>
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#define WS_MAX_QUEUED_MESSAGES 8
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#endif
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#include <ESPAsyncWebServer.h>
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#include "AsyncWebSynchronization.h"
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#ifdef ESP8266
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#include <Hash.h>
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#ifdef CRYPTO_HASH_h // include Hash.h from espressif framework if the first include was from the crypto library
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#include <../src/Hash.h>
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#endif
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#endif
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#ifdef ESP32
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#define DEFAULT_MAX_WS_CLIENTS 8
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#else
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#define DEFAULT_MAX_WS_CLIENTS 4
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#endif
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class AsyncWebSocket;
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class AsyncWebSocketResponse;
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class AsyncWebSocketClient;
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class AsyncWebSocketControl;
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typedef struct {
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/** Message type as defined by enum AwsFrameType.
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* Note: Applications will only see WS_TEXT and WS_BINARY.
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* All other types are handled by the library. */
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uint8_t message_opcode;
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/** Frame number of a fragmented message. */
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uint32_t num;
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/** Is this the last frame in a fragmented message ?*/
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uint8_t final;
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/** Is this frame masked? */
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uint8_t masked;
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/** Message type as defined by enum AwsFrameType.
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* This value is the same as message_opcode for non-fragmented
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* messages, but may also be WS_CONTINUATION in a fragmented message. */
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uint8_t opcode;
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/** Length of the current frame.
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* This equals the total length of the message if num == 0 && final == true */
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uint64_t len;
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/** Mask key */
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uint8_t mask[4];
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/** Offset of the data inside the current frame. */
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uint64_t index;
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} AwsFrameInfo;
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typedef enum { WS_DISCONNECTED, WS_CONNECTED, WS_DISCONNECTING } AwsClientStatus;
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typedef enum { WS_CONTINUATION, WS_TEXT, WS_BINARY, WS_DISCONNECT = 0x08, WS_PING, WS_PONG } AwsFrameType;
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typedef enum { WS_MSG_SENDING, WS_MSG_SENT, WS_MSG_ERROR } AwsMessageStatus;
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typedef enum { WS_EVT_CONNECT, WS_EVT_DISCONNECT, WS_EVT_PONG, WS_EVT_ERROR, WS_EVT_DATA } AwsEventType;
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class AsyncWebSocketMessageBuffer {
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private:
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uint8_t * _data;
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size_t _len;
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bool _lock;
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uint32_t _count;
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public:
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AsyncWebSocketMessageBuffer();
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AsyncWebSocketMessageBuffer(size_t size);
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AsyncWebSocketMessageBuffer(uint8_t * data, size_t size);
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AsyncWebSocketMessageBuffer(const AsyncWebSocketMessageBuffer &);
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AsyncWebSocketMessageBuffer(AsyncWebSocketMessageBuffer &&);
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~AsyncWebSocketMessageBuffer();
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void operator ++(int i) { (void)i; _count++; }
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void operator --(int i) { (void)i; if (_count > 0) { _count--; } ; }
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bool reserve(size_t size);
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void lock() { _lock = true; }
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void unlock() { _lock = false; }
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uint8_t * get() { return _data; }
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size_t length() { return _len; }
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uint32_t count() { return _count; }
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bool canDelete() { return (!_count && !_lock); }
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friend AsyncWebSocket;
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};
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class AsyncWebSocketMessage {
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protected:
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uint8_t _opcode;
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bool _mask;
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AwsMessageStatus _status;
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public:
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AsyncWebSocketMessage():_opcode(WS_TEXT),_mask(false),_status(WS_MSG_ERROR){}
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virtual ~AsyncWebSocketMessage(){}
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virtual void ack(size_t len __attribute__((unused)), uint32_t time __attribute__((unused))){}
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virtual size_t send(AsyncClient *client __attribute__((unused))){ return 0; }
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virtual bool finished(){ return _status != WS_MSG_SENDING; }
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virtual bool betweenFrames() const { return false; }
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};
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class AsyncWebSocketBasicMessage: public AsyncWebSocketMessage {
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private:
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size_t _len;
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size_t _sent;
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size_t _ack;
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size_t _acked;
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uint8_t * _data;
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public:
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AsyncWebSocketBasicMessage(const char * data, size_t len, uint8_t opcode=WS_TEXT, bool mask=false);
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AsyncWebSocketBasicMessage(uint8_t opcode=WS_TEXT, bool mask=false);
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virtual ~AsyncWebSocketBasicMessage() override;
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virtual bool betweenFrames() const override { return _acked == _ack; }
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virtual void ack(size_t len, uint32_t time) override ;
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virtual size_t send(AsyncClient *client) override ;
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};
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class AsyncWebSocketMultiMessage: public AsyncWebSocketMessage {
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private:
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uint8_t * _data;
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size_t _len;
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size_t _sent;
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size_t _ack;
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size_t _acked;
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AsyncWebSocketMessageBuffer * _WSbuffer;
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public:
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AsyncWebSocketMultiMessage(AsyncWebSocketMessageBuffer * buffer, uint8_t opcode=WS_TEXT, bool mask=false);
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virtual ~AsyncWebSocketMultiMessage() override;
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virtual bool betweenFrames() const override { return _acked == _ack; }
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virtual void ack(size_t len, uint32_t time) override ;
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virtual size_t send(AsyncClient *client) override ;
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};
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class AsyncWebSocketClient {
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private:
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AsyncClient *_client;
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AsyncWebSocket *_server;
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uint32_t _clientId;
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AwsClientStatus _status;
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LinkedList<AsyncWebSocketControl *> _controlQueue;
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LinkedList<AsyncWebSocketMessage *> _messageQueue;
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uint8_t _pstate;
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AwsFrameInfo _pinfo;
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uint32_t _lastMessageTime;
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uint32_t _keepAlivePeriod;
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void _queueMessage(AsyncWebSocketMessage *dataMessage);
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void _queueControl(AsyncWebSocketControl *controlMessage);
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void _runQueue();
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public:
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void *_tempObject;
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AsyncWebSocketClient(AsyncWebServerRequest *request, AsyncWebSocket *server);
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~AsyncWebSocketClient();
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//client id increments for the given server
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uint32_t id(){ return _clientId; }
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AwsClientStatus status(){ return _status; }
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AsyncClient* client(){ return _client; }
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AsyncWebSocket *server(){ return _server; }
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AwsFrameInfo const &pinfo() const { return _pinfo; }
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IPAddress remoteIP();
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uint16_t remotePort();
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//control frames
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void close(uint16_t code=0, const char * message=NULL);
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void ping(uint8_t *data=NULL, size_t len=0);
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//set auto-ping period in seconds. disabled if zero (default)
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void keepAlivePeriod(uint16_t seconds){
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_keepAlivePeriod = seconds * 1000;
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}
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uint16_t keepAlivePeriod(){
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return (uint16_t)(_keepAlivePeriod / 1000);
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}
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//data packets
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void message(AsyncWebSocketMessage *message){ _queueMessage(message); }
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bool queueIsFull();
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size_t printf(const char *format, ...) __attribute__ ((format (printf, 2, 3)));
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#ifndef ESP32
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size_t printf_P(PGM_P formatP, ...) __attribute__ ((format (printf, 2, 3)));
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#endif
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void text(const char * message, size_t len);
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void text(const char * message);
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void text(uint8_t * message, size_t len);
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void text(char * message);
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void text(const String &message);
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void text(const __FlashStringHelper *data);
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void text(AsyncWebSocketMessageBuffer *buffer);
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void binary(const char * message, size_t len);
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void binary(const char * message);
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void binary(uint8_t * message, size_t len);
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void binary(char * message);
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void binary(const String &message);
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void binary(const __FlashStringHelper *data, size_t len);
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void binary(AsyncWebSocketMessageBuffer *buffer);
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bool canSend() { return _messageQueue.length() < WS_MAX_QUEUED_MESSAGES; }
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//system callbacks (do not call)
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void _onAck(size_t len, uint32_t time);
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void _onError(int8_t);
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void _onPoll();
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void _onTimeout(uint32_t time);
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void _onDisconnect();
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void _onData(void *pbuf, size_t plen);
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};
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typedef std::function<bool(AsyncWebServerRequest *request)> AwsHandshakeHandler;
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typedef std::function<void(AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len)> AwsEventHandler;
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//WebServer Handler implementation that plays the role of a socket server
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class AsyncWebSocket: public AsyncWebHandler {
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public:
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typedef LinkedList<AsyncWebSocketClient *> AsyncWebSocketClientLinkedList;
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private:
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String _url;
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AsyncWebSocketClientLinkedList _clients;
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uint32_t _cNextId;
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AwsEventHandler _eventHandler;
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AwsHandshakeHandler _handshakeHandler;
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bool _enabled;
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AsyncWebLock _lock;
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public:
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AsyncWebSocket(const String& url);
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~AsyncWebSocket();
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const char * url() const { return _url.c_str(); }
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void enable(bool e){ _enabled = e; }
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bool enabled() const { return _enabled; }
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bool availableForWriteAll();
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bool availableForWrite(uint32_t id);
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size_t count() const;
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AsyncWebSocketClient * client(uint32_t id);
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bool hasClient(uint32_t id){ return client(id) != NULL; }
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void close(uint32_t id, uint16_t code=0, const char * message=NULL);
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void closeAll(uint16_t code=0, const char * message=NULL);
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void cleanupClients(uint16_t maxClients = DEFAULT_MAX_WS_CLIENTS);
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void ping(uint32_t id, uint8_t *data=NULL, size_t len=0);
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void pingAll(uint8_t *data=NULL, size_t len=0); // done
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void text(uint32_t id, const char * message, size_t len);
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void text(uint32_t id, const char * message);
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void text(uint32_t id, uint8_t * message, size_t len);
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void text(uint32_t id, char * message);
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void text(uint32_t id, const String &message);
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void text(uint32_t id, const __FlashStringHelper *message);
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void textAll(const char * message, size_t len);
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void textAll(const char * message);
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void textAll(uint8_t * message, size_t len);
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void textAll(char * message);
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void textAll(const String &message);
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void textAll(const __FlashStringHelper *message); // need to convert
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void textAll(AsyncWebSocketMessageBuffer * buffer);
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void binary(uint32_t id, const char * message, size_t len);
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void binary(uint32_t id, const char * message);
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void binary(uint32_t id, uint8_t * message, size_t len);
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void binary(uint32_t id, char * message);
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void binary(uint32_t id, const String &message);
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void binary(uint32_t id, const __FlashStringHelper *message, size_t len);
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void binaryAll(const char * message, size_t len);
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void binaryAll(const char * message);
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void binaryAll(uint8_t * message, size_t len);
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void binaryAll(char * message);
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void binaryAll(const String &message);
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void binaryAll(const __FlashStringHelper *message, size_t len);
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void binaryAll(AsyncWebSocketMessageBuffer * buffer);
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void message(uint32_t id, AsyncWebSocketMessage *message);
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void messageAll(AsyncWebSocketMultiMessage *message);
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size_t printf(uint32_t id, const char *format, ...) __attribute__ ((format (printf, 3, 4)));
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size_t printfAll(const char *format, ...) __attribute__ ((format (printf, 2, 3)));
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#ifndef ESP32
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size_t printf_P(uint32_t id, PGM_P formatP, ...) __attribute__ ((format (printf, 3, 4)));
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#endif
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size_t printfAll_P(PGM_P formatP, ...) __attribute__ ((format (printf, 2, 3)));
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//event listener
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void onEvent(AwsEventHandler handler){
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_eventHandler = handler;
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}
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// Handshake Handler
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void handleHandshake(AwsHandshakeHandler handler){
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_handshakeHandler = handler;
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}
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//system callbacks (do not call)
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uint32_t _getNextId(){ return _cNextId++; }
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void _addClient(AsyncWebSocketClient * client);
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void _handleDisconnect(AsyncWebSocketClient * client);
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void _handleEvent(AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len);
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virtual bool canHandle(AsyncWebServerRequest *request) override final;
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virtual void handleRequest(AsyncWebServerRequest *request) override final;
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// messagebuffer functions/objects.
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AsyncWebSocketMessageBuffer * makeBuffer(size_t size = 0);
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AsyncWebSocketMessageBuffer * makeBuffer(uint8_t * data, size_t size);
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LinkedList<AsyncWebSocketMessageBuffer *> _buffers;
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void _cleanBuffers();
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AsyncWebSocketClientLinkedList getClients() const;
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};
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//WebServer response to authenticate the socket and detach the tcp client from the web server request
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class AsyncWebSocketResponse: public AsyncWebServerResponse {
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private:
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String _content;
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AsyncWebSocket *_server;
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public:
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AsyncWebSocketResponse(const String& key, AsyncWebSocket *server);
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void _respond(AsyncWebServerRequest *request);
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size_t _ack(AsyncWebServerRequest *request, size_t len, uint32_t time);
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bool _sourceValid() const { return true; }
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};
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#endif /* ASYNCWEBSOCKET_H_ */
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