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waterwise.c
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waterwise.c
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/* waterwise - A simple home web service to get the bewaterwise.com index.
*
* Copyright 2020, Pascal Martin
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include "echttp.h"
#include "echttp_static.h"
#include "echttp_json.h"
#include "echttp_xml.h"
#include "houseportalclient.h"
static int WaterWiseIndexDaily = 100;
static int WaterWiseIndexWeekly = 100;
static int WaterWiseIndexMonthly = 100;
static int WaterWisePriority = 10;
static char WaterWiseState[2] = "u";
static char WaterWiseError[256] = "";
static time_t WaterWiseUpdate = 0;
static time_t WaterWiseReceived = 0;
static const char *WaterWiseUrl = "http://www.bewaterwise.com/RSS/rsswi.xml";
static const char WaterWiseDailyIndexPath[] =
".rss.content.channel.content.item[0].content.description.content";
static const char WaterWiseWeeklyIndexPath[] =
".rss.content.channel.content.item[1].content.description.content";
static const char WaterWiseMonthlyIndexPath[] =
".rss.content.channel.content.item[2].content.description.content";
static const char *WaterWiseUpdatePath =
".rss.content.channel.content.dateupdated.content";
static const char *WaterWiseIndexType = "Weekly";
static int *WaterWiseIndex = &WaterWiseIndexWeekly;
static void waterwise_select_index (const char *value) {
if (!strcasecmp ("daily", value)) {
WaterWiseIndexType = "Daily";
WaterWiseIndex = &WaterWiseIndexDaily;
} else if (!strcasecmp ("weekly", value)) {
WaterWiseIndexType = "Weekly";
WaterWiseIndex = &WaterWiseIndexWeekly;
} else if (!strcasecmp ("monthly", value)) {
WaterWiseIndexType = "Monthly";
WaterWiseIndex = &WaterWiseIndexMonthly;
}
}
static const char *waterwise_status (const char *method, const char *uri,
const char *data, int length) {
static char buffer[65537];
static char pool[65537];
static char host[256];
static char state[2];
ParserToken token[1024];
if (host[0] == 0) gethostname (host, sizeof(host));
ParserContext context = echttp_json_start (token, 1024, pool, sizeof(pool));
int root = echttp_json_add_object (context, 0, 0);
echttp_json_add_string (context, root, "host", host);
echttp_json_add_string (context, root, "proxy", houseportal_server());
echttp_json_add_integer (context, root, "timestamp", (long)time(0));
int top = echttp_json_add_object (context, root, "waterindex");
int container = echttp_json_add_object (context, top, "status");
echttp_json_add_string (context, container, "name", "waterwise");
echttp_json_add_string (context, container, "type", WaterWiseIndexType);
echttp_json_add_string (context, container, "origin", WaterWiseUrl);
echttp_json_add_string (context, container, "state", WaterWiseState);
if (WaterWiseError[0]) {
echttp_json_add_string (context, container, "error", WaterWiseError);
} else {
echttp_json_add_integer (context, container, "index", *WaterWiseIndex);
echttp_json_add_integer (context, container, "received", (long)WaterWiseReceived);
echttp_json_add_integer (context, container, "updated", (long)WaterWiseUpdate);
echttp_json_add_integer (context, container, "priority", (long)WaterWisePriority);
}
const char *error = echttp_json_export (context, buffer, sizeof(buffer));
if (error) {
echttp_error (500, error);
return "";
}
echttp_content_type_json ();
return buffer;
}
static const char *waterwise_set (const char *method, const char *uri,
const char *data, int length) {
const char *value = echttp_parameter_get("index");
if (value) {
waterwise_select_index (value);
}
return waterwise_status (method, uri, data, length);
}
static void waterwise_response
(void *origin, int status, char *data, int length) {
ParserToken tokens[100];
int count = 100;
status = echttp_redirected("GET");
if (!status) {
echttp_submit (0, 0, waterwise_response, (void *)0);
return;
}
WaterWiseState[0] = 'e'; // Assume error.
if (status != 200) {
snprintf (WaterWiseError, sizeof(WaterWiseError),
"HTTP code %d on %s", status, WaterWiseUrl);
return;
}
const char *error = echttp_xml_parse (data, tokens, &count);
if (error) {
snprintf (WaterWiseError, sizeof(WaterWiseError),
"XML syntax error %s", error);
return;
}
if (count <= 0) {
snprintf (WaterWiseError, sizeof(WaterWiseError), "no XML data");
return;
}
int index = echttp_json_search (tokens, WaterWiseDailyIndexPath);
if (index <= 0) {
snprintf (WaterWiseError, sizeof(WaterWiseError), "no daily index found");
return;
}
WaterWiseIndexDaily = atoi(tokens[index].value.string);
index = echttp_json_search (tokens, WaterWiseWeeklyIndexPath);
if (index <= 0) {
snprintf (WaterWiseError, sizeof(WaterWiseError), "no weekly index found");
return;
}
WaterWiseIndexWeekly = atoi(tokens[index].value.string);
index = echttp_json_search (tokens, WaterWiseMonthlyIndexPath);
if (index <= 0) {
snprintf (WaterWiseError, sizeof(WaterWiseError), "no monthly index found");
return;
}
WaterWiseIndexMonthly = atoi(tokens[index].value.string);
WaterWiseState[0] = 'a'; // No error found.
WaterWiseError[0] = 0;
WaterWiseReceived = time(0);
index = echttp_json_search (tokens, WaterWiseUpdatePath);
if (index <= 0) {
WaterWiseUpdate = WaterWiseReceived;
} else {
struct tm update;
const char *date = tokens[index].value.string;
update.tm_mon = atoi(date);
update.tm_mday = atoi (strchr(date, '/')+1);
update.tm_year = atoi (strrchr(date, '/')+1) - 1900;
update.tm_hour = update.tm_min = update.tm_sec = 0;
update.tm_isdst = -1;
WaterWiseUpdate = mktime (&update);
if (WaterWiseUpdate < 0) WaterWiseUpdate = 0;
}
}
static void waterwise_background (int fd, int mode) {
static time_t LastCall = 0;
time_t now = time(0);
if (now == LastCall) return;
LastCall = now;
if (now % 60) return; // Check every minute only.
if (echttp_dynamic_port()) {
if (WaterWiseReceived) houseportal_renew();
else {
static const char *path[] = {"waterindex:/waterwise"};
houseportal_register (echttp_port(4), path, 1);
}
}
if (now < WaterWiseReceived + 12 * 3600) return; // Ask twice a day.
const char *error = echttp_client ("GET", WaterWiseUrl);
if (error) {
snprintf (WaterWiseError, sizeof(WaterWiseError),
"cannot connect, %s", error);
WaterWiseState[0] = 'f';
return;
}
echttp_submit (0, 0, waterwise_response, (void *)0);
}
int main (int argc, const char **argv) {
// These strange statements are to make sure that fds 0 to 2 are
// reserved, since this application might output some errors.
// 3 descriptors are wasted if 0, 1 and 2 are already open. No big deal.
//
open ("/dev/null", O_RDONLY);
dup(open ("/dev/null", O_WRONLY));
int i;
const char *value;
for (i = 1; i < argc; ++i) {
if (echttp_option_match ("-priority=", argv[i], &value)) {
WaterWisePriority = atoi(value);
if (WaterWisePriority < 0) WaterWisePriority = 0;
} else if (echttp_option_match ("-index=", argv[i], &value)) {
waterwise_select_index (value);
}
}
echttp_default ("-http-service=dynamic");
argc = echttp_open (argc, argv);
if (echttp_dynamic_port())
houseportal_initialize (argc, argv);
echttp_route_uri ("/waterwise/set", waterwise_set);
echttp_route_uri ("/waterwise/status", waterwise_status);
echttp_static_route ("/", "/usr/local/share/house/public");
echttp_background (&waterwise_background);
echttp_loop();
}