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conky/src/weather.c

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/* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
*
* Conky, a system monitor, based on torsmo
*
* Please see COPYING for details
*
* Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
* (see AUTHORS)
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* vim: ts=4 sw=4 noet ai cindent syntax=c
*
*/
/*
* TODO: Add weather forecast info from weather.com
*
*/
#include "conky.h"
#include "logging.h"
#include "weather.h"
#include "temphelper.h"
#include "ccurl_thread.h"
#include <time.h>
#include <ctype.h>
#ifdef MATH
#include <math.h>
#endif /* MATH */
#ifdef XOAP
#include <libxml/parser.h>
#include <libxml/xpath.h>
/* Xpath expressions for XOAP xml parsing */
#define NUM_XPATH_EXPRESSIONS 7
const char *xpath_expression[NUM_XPATH_EXPRESSIONS] = {
"/weather/cc/lsup", "/weather/cc/tmp", "/weather/cc/t",
"/weather/cc/bar/r", "/weather/cc/wind/s", "/weather/cc/wind/d",
"/weather/cc/hmid"
};
#endif /* XOAP */
/* Possible sky conditions */
#define NUM_CC_CODES 6
const char *CC_CODES[NUM_CC_CODES] = {
"SKC", "CLR", "FEW", "SCT", "BKN", "OVC"
};
/* Possible weather modifiers */
#define NUM_WM_CODES 9
const char *WM_CODES[NUM_WM_CODES] = {
"VC", "MI", "BC", "PR", "TS", "BL",
"SH", "DR", "FZ"
};
/* Possible weather conditions */
#define NUM_WC_CODES 17
const char *WC_CODES[NUM_WC_CODES] = {
"DZ", "RA", "GR", "GS", "SN", "SG",
"FG", "HZ", "FU", "BR", "DU", "SA",
"FC", "PO", "SQ", "SS", "DS"
};
static ccurl_location_t *locations_head = 0;
void weather_free_info(void)
{
ccurl_free_locations(&locations_head);
}
int rel_humidity(int dew_point, int air) {
const float a = 17.27f;
const float b = 237.7f;
float diff = a*(dew_point/(b+dew_point)-air/(b+air));
#ifdef MATH
return (int)(100.f*expf(diff));
#else
return (int)(16.666667163372f*(6.f+diff*(6.f+diff*(3.f+diff))));
#endif /* MATH */
}
#ifdef XOAP
static void parse_cc(PWEATHER *res, xmlXPathContextPtr xpathCtx)
{
int i;
char *content;
xmlXPathObjectPtr xpathObj;
for (i = 0; i < NUM_XPATH_EXPRESSIONS; i++) {
xpathObj = xmlXPathEvalExpression((xmlChar *)xpath_expression[i], xpathCtx);
if ((xpathObj != NULL) && (xpathObj->nodesetval->nodeTab[0]->type == XML_ELEMENT_NODE)) {
content = (char *)xmlNodeGetContent(xpathObj->nodesetval->nodeTab[0]);
switch(i) {
case 0:
strncpy(res->lastupd, content, 31);
break;
case 1:
res->temp = atoi(content);
break;
case 2:
if(res->xoap_t[0] == '\0') {
strncpy(res->xoap_t, content, 31);
}
break;
case 3:
res->bar = atoi(content);
break;
case 4:
res->wind_s = atoi(content);
break;
case 5:
if (isdigit((char)content[0])) {
res->wind_d = atoi(content);
}
break;
case 6:
res->hmid = atoi(content);
}
xmlFree(content);
}
xmlXPathFreeObject(xpathObj);
}
return;
}
static void parse_weather_xml(PWEATHER *res, const char *data)
{
xmlDocPtr doc;
xmlXPathContextPtr xpathCtx;
if (!(doc = xmlReadMemory(data, strlen(data), "", NULL, 0))) {
ERR("weather: can't read xml data");
return;
}
xpathCtx = xmlXPathNewContext(doc);
if(xpathCtx == NULL) {
ERR("weather: unable to create new XPath context");
xmlFreeDoc(doc);
return;
}
parse_cc(res, xpathCtx);
xmlXPathFreeContext(xpathCtx);
xmlFreeDoc(doc);
return;
}
#endif /* XOAP */
/*
* Horrible hack to avoid using regexes
*
*/
static inline void parse_token(PWEATHER *res, char *token) {
int i;
char s_tmp[64];
switch (strlen(token)) {
//Check all tokens 2 chars long
case 2:
//Check if token is a weather condition
for (i=0; i<2; i++) {
if (!isalpha(token[i])) break;
}
if (i==2) {
for(i=0; i<NUM_WC_CODES; i++) {
if (!strncmp(token, WC_CODES[i], 2)) {
res->wc=i+1;
break;
}
}
return;
}
//Check for CB
if (!strcmp(token, "CB")) {
res->cc = 8;
return;
}
break;
//Check all tokens 3 chars long
case 3:
//Check if token is a modified weather condition
if ((token[0] == '+') || (token[0] == '-')) {
for (i=1; i<3; i++) {
if (!isalpha(token[i])) break;
}
if (i==3) {
for(i=0; i<NUM_WC_CODES; i++) {
if (!strncmp(&token[1], WC_CODES[i], 2)) {
res->wc=i+1;
break;
}
}
return;
}
}
//Check for NCD or NSC
if ((!strcmp(token, "NCD")) || (!strcmp(token, "NSC"))) {
res->cc = 1;
return;
}
//Check for TCU
if (!strcmp(token, "TCU")) {
res->cc = 7;
return;
}
break;
//Check all tokens 4 chars long
case 4:
//Check if token is a modified weather condition
for(i=0; i<NUM_WM_CODES; i++) {
if (!strncmp(token, WM_CODES[i], 2)) {
for(i=0; i<NUM_WC_CODES; i++) {
if (!strncmp(&token[2], WC_CODES[i], 2)) {
res->wc=i+1;
return;
}
}
break;
}
}
break;
//Check all tokens 5 chars long
case 5:
//Check for CAVOK
if (!strcmp(token, "CAVOK")) {
res->cc = 1;
return;
}
//Check if token is the temperature
for (i=0; i<2; i++) {
if (!isdigit(token[i])) break;
}
if ((i==2) && (token[2] == '/')) {
for (i=3; i<5; i++) {
if (!isdigit(token[i])) break;
}
if (i==5) {
//First 2 digits gives the air temperature
res->temp=atoi(token);
//4th and 5th digits gives the dew point temperature
res->dew=atoi(&token[3]);
//Compute humidity
res->hmid = rel_humidity(res->dew, res->temp);
return;
}
}
//Check if token is the pressure
if ((token[0] == 'Q') || (token[0] == 'A')) {
for (i=1; i<5; i++) {
if (!isdigit(token[i])) break;
}
if (i==5) {
if (token[0] == 'A') {
//Convert inches of mercury to mbar
res->bar = (int)(atoi(&token[1])*0.338637526f);
return;
}
//Last 4 digits is pressure im mbar
res->bar = atoi(&token[1]);
return;
}
}
//Check if token is a modified weather condition
if ((token[0] == '+') || (token[0] == '-')) {
for(i=0; i<NUM_WM_CODES; i++) {
if (!strncmp(&token[1], WM_CODES[i], 2)) {
for(i=0; i<NUM_WC_CODES; i++) {
if (!strncmp(&token[3], WC_CODES[i], 2)) {
res->wc=i+1;
return;
}
}
break;
}
}
}
break;
//Check all tokens 6 chars long
case 6:
//Check if token is the cloud cover
for (i=0; i<3; i++) {
if (!isalpha(token[i])) break;
}
if (i==3) {
for (i=3; i<6; i++) {
if (!isdigit(token[i])) break;
}
if (i==6) {
//Check if first 3 digits gives the cloud cover condition
for(i=0; i<NUM_CC_CODES; i++) {
if (!strncmp(token, CC_CODES[i], 3)) {
res->cc=i+1;
break;
}
}
return;
}
}
//Check if token is positive temp and negative dew
for (i=0; i<2; i++) {
if (!isdigit(token[i])) break;
}
if ((i==2) && (token[2] == '/') && (token[3] == 'M')) {
for (i=4; i<6; i++) {
if (!isdigit(token[i])) break;
}
if (i==6) {
//1st and 2nd digits gives the temperature
res->temp = atoi(token);
//5th and 6th digits gives the dew point temperature
res->dew = -atoi(&token[4]);
//Compute humidity
res->hmid = rel_humidity(res->dew, res->temp);
return;
}
}
break;
//Check all tokens 7 chars long
case 7:
//Check if token is the observation time
for (i=0; i<6; i++) {
if (!isdigit(token[i])) break;
}
if ((i==6) && (token[6] == 'Z')) return;
//Check if token is the wind speed/direction in knots
for (i=0; i<5; i++) {
if (!isdigit(token[i])) break;
}
if ((i==5) && (token[5] == 'K') && (token[6] == 'T')) {
//First 3 digits are wind direction
strncpy(s_tmp, token, 3);
s_tmp[3]='\0';
res->wind_d=atoi(s_tmp);
//4th and 5th digit are wind speed in knots (convert to km/hr)
res->wind_s = (int)(atoi(&token[3])*1.852);
return;
}
//Check if token is negative temperature
if ((token[0] == 'M') && (token[4] == 'M')) {
for (i=1; i<3; i++) {
if (!isdigit(token[i])) break;
}
if ((i==3) && (token[3] == '/')) {
for (i=5; i<7; i++) {
if (!isdigit(token[i])) break;
}
if (i==7) {
//2nd and 3rd digits gives the temperature
res->temp = -atoi(&token[1]);
//6th and 7th digits gives the dew point temperature
res->dew = -atoi(&token[5]);
//Compute humidity
res->hmid = rel_humidity(res->dew, res->temp);
return;
}
}
}
//Check if token is wind variability
for (i=0; i<3; i++) {
if (!isdigit(token[i])) break;
}
if ((i==3) && (token[3] == 'V')) {
for (i=4; i<7; i++) {
if (!isdigit(token[i])) break;
}
if (i==7) return;
}
break;
//Check all tokens 8 chars long
case 8:
//Check if token is the wind speed/direction in m/s
for (i=0; i<5; i++) {
if (!isdigit(token[i])) break;
}
if ((i==5)&&(token[5] == 'M')&&(token[6] == 'P')&&(token[7] == 'S')) {
//First 3 digits are wind direction
strncpy(s_tmp, token, 3);
s_tmp[3]='\0';
res->wind_d=atoi(s_tmp);
//4th and 5th digit are wind speed in m/s (convert to km/hr)
res->wind_s = (int)(atoi(&token[3])*3.6);
return;
}
default:
//printf("token : %s\n", token);
break;
}
}
void parse_weather(void *result, const char *data)
{
PWEATHER *res = (PWEATHER*)result;
/* Reset results */
memset(res, 0, sizeof(PWEATHER));
#ifdef XOAP
//Check if it is an xml file
if ( strncmp(data, "<?xml ", 6) == 0 ) {
parse_weather_xml(res, data);
} else
#endif /* XOAP */
{
//We assume its a text file
char s_tmp[256];
const char delim[] = " ";
//Divide time stamp and metar data
if (sscanf(data, "%[^'\n']\n%[^'\n']", res->lastupd, s_tmp) == 2) {
//Process all tokens
char *p_tok = NULL;
char *p_save = NULL;
if ((strtok_r(s_tmp, delim, &p_save)) != NULL) {
//Jump first token, must be icao
p_tok = strtok_r(NULL, delim, &p_save);
do {
parse_token(res, p_tok);
p_tok = strtok_r(NULL, delim, &p_save);
} while (p_tok != NULL);
}
return;
}
else {
return;
}
}
}
void weather_process_info(char *p, int p_max_size, char *uri, char *data_type, int interval)
{
static const char *wc[] = {
"", "drizzle", "rain", "hail", "soft hail",
"snow", "snow grains", "fog", "haze", "smoke",
"mist", "dust", "sand", "funnel cloud tornado",
"dust/sand", "squall", "sand storm", "dust storm"
};
PWEATHER *data;
ccurl_location_t *curloc = ccurl_find_location(&locations_head, uri);
if (!curloc->p_timed_thread) {
curloc->result = malloc(sizeof(PWEATHER));
memset(curloc->result, 0, sizeof(PWEATHER));
curloc->process_function = &parse_weather;
ccurl_init_thread(curloc, interval);
if (!curloc->p_timed_thread) {
ERR("error setting up weather thread");
}
}
timed_thread_lock(curloc->p_timed_thread);
data = (PWEATHER*)curloc->result;
if (strcmp(data_type, "last_update") == EQUAL) {
strncpy(p, data->lastupd, p_max_size);
} else if (strcmp(data_type, "temperature") == EQUAL) {
temp_print(p, p_max_size, data->temp, TEMP_CELSIUS);
} else if (strcmp(data_type, "cloud_cover") == EQUAL) {
#ifdef XOAP
if (data->xoap_t[0] != '\0') {
strncpy(p, data->xoap_t, p_max_size);
} else
#endif /* XOAP */
if (data->cc == 0) {
strncpy(p, "", p_max_size);
} else if (data->cc < 3) {
strncpy(p, "clear", p_max_size);
} else if (data->cc < 5) {
strncpy(p, "partly cloudy", p_max_size);
} else if (data->cc == 5) {
strncpy(p, "cloudy", p_max_size);
} else if (data->cc == 6) {
strncpy(p, "overcast", p_max_size);
} else if (data->cc == 7) {
strncpy(p, "towering cumulus", p_max_size);
} else {
strncpy(p, "cumulonimbus", p_max_size);
}
} else if (strcmp(data_type, "pressure") == EQUAL) {
snprintf(p, p_max_size, "%d", data->bar);
} else if (strcmp(data_type, "wind_speed") == EQUAL) {
snprintf(p, p_max_size, "%d", data->wind_s);
} else if (strcmp(data_type, "wind_dir") == EQUAL) {
if ((data->wind_d >= 349) || (data->wind_d < 12)) {
strncpy(p, "N", p_max_size);
} else if (data->wind_d < 33) {
strncpy(p, "NNE", p_max_size);
} else if (data->wind_d < 57) {
strncpy(p, "NE", p_max_size);
} else if (data->wind_d < 79) {
strncpy(p, "ENE", p_max_size);
} else if (data->wind_d < 102) {
strncpy(p, "E", p_max_size);
} else if (data->wind_d < 124) {
strncpy(p, "ESE", p_max_size);
} else if (data->wind_d < 147) {
strncpy(p, "SE", p_max_size);
} else if (data->wind_d < 169) {
strncpy(p, "SSE", p_max_size);
} else if (data->wind_d < 192) {
strncpy(p, "S", p_max_size);
} else if (data->wind_d < 214) {
strncpy(p, "SSW", p_max_size);
} else if (data->wind_d < 237) {
strncpy(p, "SW", p_max_size);
} else if (data->wind_d < 259) {
strncpy(p, "WSW", p_max_size);
} else if (data->wind_d < 282) {
strncpy(p, "W", p_max_size);
} else if (data->wind_d < 304) {
strncpy(p, "WNW", p_max_size);
} else if (data->wind_d < 327) {
strncpy(p, "NW", p_max_size);
} else if (data->wind_d < 349) {
strncpy(p, "NNW", p_max_size);
};
} else if (strcmp(data_type, "wind_dir_DEG") == EQUAL) {
snprintf(p, p_max_size, "%d", data->wind_d);
} else if (strcmp(data_type, "humidity") == EQUAL) {
snprintf(p, p_max_size, "%d", data->hmid);
} else if (strcmp(data_type, "weather") == EQUAL) {
strncpy(p, wc[data->wc], p_max_size);
}
timed_thread_unlock(curloc->p_timed_thread);
}
#ifdef XOAP
/* xoap suffix for weather from weather.com */
static char *xoap = NULL;
/*
* TODO: make the xoap keys file readable from the config file
* make the keys directly readable from the config file
* make the xoap keys file giveable as a command line option
*/
void load_xoap_keys(void)
{
FILE *fp;
char *par = (char *) malloc(11 * sizeof(char));
char *key = (char *) malloc(17 * sizeof(char));
xoap = (char *) malloc(64 * sizeof(char));
to_real_path(xoap, XOAP_FILE);
fp = fopen(xoap, "r");
if (fp != NULL) {
if (fscanf(fp, "%10s %16s", par, key) == 2) {
strcpy(xoap, "?cc=*&link=xoap&prod=xoap&par=");
strcat(xoap, par);
strcat(xoap, "&key=");
strcat(xoap, key);
strcat(xoap, "&unit=m");
} else {
free(xoap);
xoap = NULL;
}
fclose(fp);
} else {
free(xoap);
xoap = NULL;
}
free(par);
free(key);
}
#endif /* XOAP */
int process_weather_uri(char *uri, char *locID)
{
/* locID MUST BE upper-case */
char *tmp_p = locID;
while (*tmp_p) {
*tmp_p = toupper(*tmp_p);
tmp_p++;
}
/* Construct complete uri */
#ifdef XOAP
if (strstr(uri, "xoap.weather.com")) {
if (xoap != NULL) {
strcat(uri, locID);
strcat(uri, xoap);
} else {
free(uri);
uri = NULL;
}
} else
#endif /* XOAP */
if (strstr(uri, "weather.noaa.gov")) {
strcat(uri, locID);
strcat(uri, ".TXT");
} else if (!strstr(uri, "localhost") && !strstr(uri, "127.0.0.1")) {
return -1;
}
return 0;
}
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