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httpserver.cpp
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#include <stdarg.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <signal.h>
#include <sys/types.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <resolv.h>
#include <arpa/inet.h>
#include <pthread.h>
#include "httpserver.h"
#include "XML.h"
#include <sstream>
#include <iomanip>
using namespace std;
#define MAXBUF (1024)
HTTPServer::HTTPServer( Config cfg, WeatherData *_wd ):
WeatherSink( cfg, _wd, "HTTP Server")
{
startMain();
}
HTTPServer::~HTTPServer()
{
endMain();
}
void HTTPServer::return404( FILE *fp, string url )
{
std::ostringstream oss;
oss << "<html><head>" << endl;
oss << "<title>404 Not Found</title>" << endl;
oss << "</head><body>" << endl;
oss << "<h1>Not Found</h1>" << endl;
oss << "<p>The request URL " << url << " was not found on the server.</p>"
<< endl;
oss << "</body></html>" << endl;
fprintf(fp, "HTTP/1.1 404 Not Found\n");
fprintf(fp, "Content-Type: text/html\n");
fprintf(fp, "Content-Length: %d\n\n", oss.str().size());
fprintf(fp, "%s", oss.str().c_str());
fflush(fp);
}
int HTTPServer::outputXMLFile( FILE *outFp, const char *filename )
{
char buf[ 1024 ];
struct stat statBuf;
if ( stat( filename, &statBuf ) == -1 )
{
dbg.printf(NOTICE, "error stat'ing %s: %s\n", filename,
strerror(errno));
return -1;
}
int fileSize = statBuf.st_size;
int len=0;
fprintf(outFp, "HTTP/1.1 200 OK\n");
fprintf(outFp, "Content-type: text/xml\n" );
fprintf(outFp, "Content-length: %d\n\n", fileSize );
int inFD = open(filename, O_RDONLY );
if ( inFD != -1 )
{
while( (len = read( inFD, buf, sizeof( buf ))) > 0 )
{
fwrite( buf, len, 1, outFp );
}
}
else
{
dbg.printf(NOTICE, "Error reading %s: %s\n", filename, strerror( errno
));
return -1;
}
close( inFD );
fflush(outFp);
return fileSize;
}
string HTTPServer::getCurrent()
{
//char rfc2822_timestamp[ 64 ];
char rfc1123_timestamp[ 64 ];
char secs[64];
wd->now->RFC1123( rfc1123_timestamp, 64 );
snprintf(secs, 64, "%d", (int)wd->now->unixtime());
XML weather("weather", "version", "1.0");
XML location("location");
XML observation("observation");
observation.addAttribute("timestamp", rfc1123_timestamp );
observation.addAttribute("secs", secs );
{
XML sensor( "sensor", wd->getValue(WeatherData::outsideTemp, 0 ));
sensor.addAttribute("type", "outsideTemperature" );
sensor.addAttribute("units", "°F" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::outsideHumidity, 0 ));
sensor.addAttribute("type", "outsideHumidity" );
sensor.addAttribute("units", "%" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::insideTemp, 0 ));
sensor.addAttribute("type", "insideTemperature" );
sensor.addAttribute("units", "°F" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::insideHumidity, 0 ));
sensor.addAttribute("type", "insideHumidity" );
sensor.addAttribute("units", "%" );
observation.addNode( sensor );
}
{
double val = wd->getValue(WeatherData::heatIndex, 0 );
XML sensor( "sensor" );
if ( val != NO_VALUE )
{
sensor.setValue( val );
}
sensor.addAttribute("type", "heatIndex" );
sensor.addAttribute("units", "°F" );
observation.addNode( sensor );
}
{
double val = wd->getValue(WeatherData::humidex, 0 );
XML sensor( "sensor" );
if ( val != NO_VALUE )
{
sensor.setValue( val );
}
sensor.addAttribute("type", "humidex" );
sensor.addAttribute("units", "°F" );
observation.addNode( sensor );
}
{
double val = wd->getValue(WeatherData::windChill, 0 );
XML sensor( "sensor" );
if ( val != NO_VALUE )
{
sensor.setValue( val );
}
sensor.addAttribute("type", "windChill" );
sensor.addAttribute("units", "°F" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::apparentTemp, 0 ));
sensor.addAttribute("type", "apparentTemp" );
sensor.addAttribute("units", "°F" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::averageWindDirection, 0 ));
sensor.addAttribute("type", "averageWindDirection" );
sensor.addAttribute("units", "°" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::averageWindSpeed, 0 ));
sensor.addAttribute("type", "averageWindSpeed" );
sensor.addAttribute("units", "mph" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::windDirection, 0 ));
sensor.addAttribute("type", "instantWindDirection" );
sensor.addAttribute("units", "°" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::windSpeed, 0 ));
sensor.addAttribute("type", "instantWindSpeed" );
sensor.addAttribute("units", "mph" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::windGustDir, 0 ));
sensor.addAttribute("type", "windGustDirection" );
sensor.addAttribute("units", "°" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::windGust, 0 ));
sensor.addAttribute("type", "windGustSpeed" );
sensor.addAttribute("units", "mph" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::rainRate, 0 )/100.0);
sensor.addAttribute("type", "rainRate" );
sensor.addAttribute("units", "in/hr" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::instantRain, 0 )/100.0);
sensor.addAttribute("type", "instantRainRate" );
sensor.addAttribute("units", "in/hr" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::dailyRain, 0 )/100.0);
sensor.addAttribute("type", "dailyRain" );
sensor.addAttribute("units", "in" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::rain24Hour, 0 )/100.0);
sensor.addAttribute("type", "rainLast24Hours" );
sensor.addAttribute("units", "in" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::stationPressure, 0 ));
sensor.addAttribute("type", "stationPressure" );
sensor.addAttribute("units", "inHg" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::SLP, 0 ));
sensor.addAttribute("type", "SLP" );
sensor.addAttribute("units", "inHg" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::altimeter, 0 ));
sensor.addAttribute("type", "altimeter" );
sensor.addAttribute("units", "inHg" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::dewPoint, 0 ));
sensor.addAttribute("type", "dewPoint" );
sensor.addAttribute("units", "°F" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::cloudHeight, 0 ));
sensor.addAttribute("type", "cloudHeight" );
sensor.addAttribute("units", "ft" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::solarRadiation, 0 ));
sensor.addAttribute("type", "solarRadiation" );
sensor.addAttribute("units", "W/m^2" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::solarPercent, 0 ));
sensor.addAttribute("type", "solarRadiationPercent" );
sensor.addAttribute("units", "%" );
observation.addNode( sensor );
}
{
XML sensor( "sensor", wd->getValue(WeatherData::UV, 0 ));
sensor.addAttribute("type", "UV" );
sensor.addAttribute("units", "index" );
observation.addNode( sensor );
}
{
XML sensor( "trend" );
sensor.setValue( wd->getTrend(WeatherData::altimeter ), 3, ios_base::showpos );
sensor.addAttribute("type", "altimeter" );
sensor.addAttribute("units", "inHg/hr" );
observation.addNode( sensor );
}
{
XML sensor( "trend" );
sensor.setValue(wd->getTrend(WeatherData::outsideTemp ), 3, ios_base::showpos );
sensor.addAttribute("type", "outsideTemperature" );
sensor.addAttribute("units", "°F/hr" );
observation.addNode( sensor );
}
{
XML sensor( "trend" );
sensor.setValue(wd->getTrend(WeatherData::outsideHumidity ), 3, ios_base::showpos );
sensor.addAttribute("type", "outsideHumidity" );
sensor.addAttribute("units", "%/hr" );
observation.addNode( sensor );
}
{
XML sensor( "trend" );
sensor.setValue(wd->getTrend(WeatherData::dewPoint ), 3, ios_base::showpos );
sensor.addAttribute("type", "dewPoint" );
sensor.addAttribute("units", "°F/hr" );
observation.addNode( sensor );
}
location.addAttribute("postal_code", cfg.getString("postal_code"));
location.addAttribute("city", cfg.getString("city"));
location.addAttribute("state", cfg.getString("state"));
location.addAttribute("latitude", cfg.getDouble("latitude"), 4);
location.addAttribute("longitude", cfg.getDouble("longitude"), 4);
location.addNode( observation );
weather.addNode( location );
return weather.str( 0, "weather.xsl" );
}
void HTTPServer::processRequest( FILE *fp, std::string req )
{
string content;
if ( req == "/" )
{
content = getCurrent();
}
else if ( req == "/weather.xsl" )
{
if ( outputXMLFile(fp, "weather.xsl") == -1 )
{
return404( fp, req );
}
// Return early because we already sent the output
return;
}
else
{
return404( fp, req );
return;
}
fprintf(fp, "HTTP/1.1 200 OK\n");
fprintf(fp, "Content-type: text/xml\n" );
fprintf(fp, "Content-length: %d\n\n", content.size());
fprintf(fp, "%s", content.c_str() );
fflush(fp);
}
void HTTPServer::worker( int client )
{
int len;
int timeout = 15;
FILE* fp = fdopen(client, "w");
fd_set rfds;
FD_ZERO( &rfds );
FD_SET( client, &rfds );
struct timeval tv;
tv.tv_sec = timeout;
tv.tv_usec = 0;
while ( select( client + 1, &rfds, NULL, NULL, &tv ) > 0 )
{
if ( ( len = recv(client, buffer, MAXBUF, 0)) <= 0 )
break;
if ( fp == NULL )
{
dbg.printf(EMERG, "fpopen failed: %s\n", strerror( errno ));
}
else
{
char req[PATH_MAX] = "";
sscanf(buffer, "GET %s HTTP", req);
dbg.printf(INFO, "Request: \"%s\"\n", req);
if ( req[0] != 0 )
processRequest( fp, req );
}
tv.tv_sec = timeout;
tv.tv_usec = 0;
FD_ZERO( &rfds );
FD_SET( client, &rfds );
}
dbg.printf(NOTICE, "Closing HTTP connection\n");
fclose(fp);
close(client);
}
void HTTPServer::main(void)
{
struct sockaddr_in addr;
int sd, addrlen = sizeof(addr);
fd_set rfds;
int on = 1;
pthread_t workerId;
if ( (sd = socket(PF_INET, SOCK_STREAM, 0)) < 0 )
{
dbg.printf(EMERG, "Error creating socket: %s\n", strerror( errno ));
return;
}
if ( setsockopt( sd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof( on )) < 0 )
{
dbg.printf(EMERG, "setsockopt: %s\n", strerror( errno ));
return;
};
addr.sin_family = AF_INET;
int port = cfg.getInteger("http_port");
if ( port == 0 )
port = 6100;
dbg.printf(NOTICE, "Listening on port: %d\n", port );
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
if ( bind(sd, (struct sockaddr*)&addr, addrlen) < 0 )
{
dbg.printf(EMERG, "Error binding: %s\n", strerror( errno ));
return;
}
if ( listen(sd, 20) < 0 )
{
dbg.printf(EMERG, "Error listening: %s\n", strerror( errno ));
return;
}
struct timeval tv;
while ( threadRunning )
{
tv.tv_sec = 1;
tv.tv_usec = 0;
FD_ZERO( &rfds );
FD_SET( sd, &rfds );
int rval = select ( sd +1, &rfds, NULL, NULL, &tv );
if ( rval <= 0 )
{
if ( !threadRunning )
{
dbg.printf(EMERG, "Leaving\n");
break;
}
else
{
continue;
}
}
int client = accept(sd, (struct sockaddr*)&addr, (socklen_t*)&addrlen);
if ( client < 0 )
{
dbg.printf(EMERG, "Error accept connection: %s\n", strerror( errno ));
}
else
{
dbg.printf(NOTICE, "Connected: %s:%d\n", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
HTTPThread_t *t = new HTTPThread_t;
t->server = this;
t->client = client;
pthread_attr_t attr;
pthread_attr_init( &attr );
pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_DETACHED );
pthread_create( &workerId, &attr, startHTTPThread, (void*)t);
}
}
dbg.printf(DEBUG, "closing socket\n");
close(sd);
return;
}
void *startHTTPThread( void *ptr )
{
Debug dbg("HTTP Thread");
HTTPThread_t *p = (HTTPThread_t *)ptr;
HTTPServer *http = p->server;
http->worker( p->client );
delete( p );
return NULL;
}