forked from me-no-dev/ESPAsyncWebServer
Add EventSource plugin
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Me No Dev
250
src/AsyncEventSource.cpp
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250
src/AsyncEventSource.cpp
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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 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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#include "Arduino.h"
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#include "AsyncEventSource.h"
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// Client
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AsyncEventSourceClient::AsyncEventSourceClient(AsyncWebServerRequest *request, AsyncEventSource *server){
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_client = request->client();
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_server = server;
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next = NULL;
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//_client->onError([](void *r, AsyncClient* c, int8_t error){ ((AsyncEventSourceClient*)(r))->_onError(error); }, this);
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//_client->onAck([](void *r, AsyncClient* c, size_t len, uint32_t time){ ((AsyncEventSourceClient*)(r))->_onAck(len, time); }, this);
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//_client->onPoll([](void *r, AsyncClient* c){ ((AsyncEventSourceClient*)(r))->_onPoll(); }, this);
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_client->onError(NULL, NULL);
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_client->onAck(NULL, NULL);
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_client->onPoll(NULL, NULL);
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_client->onData(NULL, NULL);
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_client->onTimeout([](void *r, AsyncClient* c, uint32_t time){ ((AsyncEventSourceClient*)(r))->_onTimeout(time); }, this);
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_client->onDisconnect([](void *r, AsyncClient* c){ ((AsyncEventSourceClient*)(r))->_onDisconnect(); }, this);
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_server->_addClient(this);
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delete request;
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}
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AsyncEventSourceClient::~AsyncEventSourceClient(){
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close();
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}
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//void AsyncEventSourceClient::_onAck(size_t len, uint32_t time){}
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//void AsyncEventSourceClient::_onPoll(){}
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//void AsyncEventSourceClient::_onError(int8_t){}
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void AsyncEventSourceClient::_onTimeout(uint32_t time){
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_client->close(true);
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}
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void AsyncEventSourceClient::_onDisconnect(){
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AsyncClient* cl = _client;
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_client = NULL;
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cl->free();
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delete cl;
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_server->_handleDisconnect(this);
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}
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void AsyncEventSourceClient::close(){
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if(_client != NULL)
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_client->close(true);
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}
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void AsyncEventSourceClient::send(const char * message, size_t len){
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if(!_client->canSend()){
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return;
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}
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if(_client->space() < len){
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return;
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}
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_client->write(message, len);
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}
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// Handler
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AsyncEventSource::AsyncEventSource(String url):_url(url){}
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AsyncEventSource::~AsyncEventSource(){
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close();
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}
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void AsyncEventSource::_addClient(AsyncEventSourceClient * client){
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if(_clients == NULL){
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_clients = client;
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return;
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}
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AsyncEventSourceClient * c = _clients;
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while(c->next != NULL) c = c->next;
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c->next = client;
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}
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void AsyncEventSource::_handleDisconnect(AsyncEventSourceClient * client){
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if(_clients == NULL){
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return;
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}
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if(_clients == client){
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_clients = client->next;
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delete client;
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return;
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}
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AsyncEventSourceClient * c = _clients;
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while(c->next != NULL && c->next != client) c = c->next;
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if(c->next == NULL){
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return;
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}
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c->next = client->next;
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delete client;
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}
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void AsyncEventSource::close(){
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AsyncEventSourceClient * c = _clients;
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while(c != NULL){
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if(c->connected())
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c->close();
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c = c->next;
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}
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}
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void AsyncEventSource::send(const char *message, const char *event, uint32_t id, uint32_t reconnect){
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if(_clients == NULL)
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return;
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String ev = "";
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if(reconnect){
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ev += "retry: ";
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ev += String(reconnect);
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ev += "\r\n";
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}
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if(id){
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ev += "id: ";
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ev += String(reconnect);
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ev += "\r\n";
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}
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if(event != NULL){
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ev += "event: ";
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ev += String(event);
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ev += "\r\n";
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}
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if(message != NULL){
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size_t messageLen = strlen(message);
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char * lineStart = (char *)message;
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char * lineEnd;
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do {
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char * nextN = strchr(lineStart, '\n');
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char * nextR = strchr(lineStart, '\r');
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if(nextN == NULL && nextR == NULL){
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//last line
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size_t llen = ((char *)message + messageLen) - lineStart;
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char * ldata = (char *)malloc(llen+1);
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if(ldata != NULL){
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memcpy(ldata, lineStart, llen);
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ldata[llen] = 0;
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ev += "data: ";
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ev += ldata;
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ev += "\r\n\r\n";
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free(ldata);
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}
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lineStart = (char *)message + messageLen;
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} else {
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char * nextLine = NULL;
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if(nextN != NULL && nextR != NULL){
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if(nextR < nextN){
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lineEnd = nextR;
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if(nextN == (nextR + 1))
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nextLine = nextN + 1;
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else
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nextLine = nextR + 1;
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} else {
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lineEnd = nextN;
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if(nextR == (nextN + 1))
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nextLine = nextR + 1;
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else
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nextLine = nextN + 1;
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}
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} else if(nextN != NULL){
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lineEnd = nextN;
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nextLine = nextN + 1;
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} else {
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lineEnd = nextR;
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nextLine = nextR + 1;
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}
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size_t llen = lineEnd - lineStart;
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char * ldata = (char *)malloc(llen+1);
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if(ldata != NULL){
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memcpy(ldata, lineStart, llen);
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ldata[llen] = 0;
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ev += "data: ";
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ev += ldata;
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ev += "\r\n";
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free(ldata);
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}
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lineStart = nextLine;
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if(lineStart == ((char *)message + messageLen))
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ev += "\r\n";
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}
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} while(lineStart < ((char *)message + messageLen));
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}
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//os_printf("EVENT_SOURCE:\n%s", ev.c_str());
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AsyncEventSourceClient * c = _clients;
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while(c != NULL){
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if(c->connected())
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c->send(ev.c_str(), ev.length());
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c = c->next;
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}
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ev = String();
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}
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bool AsyncEventSource::canHandle(AsyncWebServerRequest *request){
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if(request->method() != HTTP_GET || !request->url().equals(_url))
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return false;
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return true;
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}
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void AsyncEventSource::handleRequest(AsyncWebServerRequest *request){
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request->send(new AsyncEventSourceResponse(this));
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}
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// Response
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AsyncEventSourceResponse::AsyncEventSourceResponse(AsyncEventSource *server){
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_server = server;
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_code = 200;
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_contentType = "text/event-stream";
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_sendContentLength = false;
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addHeader("Cache-Control", "no-cache");
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addHeader("Connection","keep-alive");
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}
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void AsyncEventSourceResponse::_respond(AsyncWebServerRequest *request){
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String out = _assembleHead(request->version());
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request->client()->write(out.c_str(), _headLength);
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_state = RESPONSE_WAIT_ACK;
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}
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size_t AsyncEventSourceResponse::_ack(AsyncWebServerRequest *request, size_t len, uint32_t time){
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if(len){
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new AsyncEventSourceClient(request, _server);
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}
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return 0;
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}
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