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housesprinkler_control.c
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housesprinkler_control.c
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/* housesprinkler - A simple home web server for sprinkler control
*
* 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.
*
*
* housesprinkler_control.c - Interface with the control servers.
*
* SYNOPSYS:
*
* This module handles detection of, and communication with, the control
* servers:
* - Run periodic discoveries to find which server handles each control.
* - Handle the HTTP control requests (and redirects).
*
* Each control is independent of each other: see the zone and feed
* modules for the application logic that applies to controls.
*
* This module remembers which controls are active, so that it does not
* have to stop every known control on cancel.
*
* void housesprinkler_control_reset (void);
*
* Erases the list of known control points.
* This function must be called before applying a new configuration.
*
* void housesprinkler_control_declare (const char *name, const char *type);
*
* Declare a new control point to be discovered.
*
* void housesprinkler_control_event (const char *name, int enable, int once);
*
* Enable or disable activation events for the specified control:
* - If enable and once are both true, events are automatically disabled
* after one event has been issued.
* - If enable is true and once is false, events are enabled until
* explicitly disabled.
* - If enable is false, once is ignored and events are disabled until
* explicitly enabled.
*
* This has no impact on "unusual" events like discovery or stop.
*
* void housesprinkler_control_start (const char *name,
* int pulse, const char *context);
*
* Activate one control for the duration set by pulse. The context is
* typically the name of the schedule, or 0 for manual activation.
*
* void housesprinkler_control_cancel (const char *name);
*
* Immediately stop a control, or all active controls if name is null.
*
* char housesprinkler_control_state (const char *name);
*
* Return the current state of the control.
*
* void housesprinkler_control_periodic (time_t now);
*
* The periodic function that detects the control servers.
*
* int housesprinkler_control_status (char *buffer, int size);
*
* Return the status of control points in JSON format.
*/
#include <string.h>
#include <stdlib.h>
#include <echttp.h>
#include <echttp_json.h>
#include "houselog.h"
#include "housediscover.h"
#include "housesprinkler.h"
#include "housesprinkler_time.h"
#include "housesprinkler_control.h"
#define DEBUG if (sprinkler_isdebug()) printf
static char **Providers = 0;
static int ProvidersCount = 0;
static int ProvidersAllocated = 0;
typedef struct {
const char *name;
const char *type;
char status;
char event;
char once;
time_t deadline;
char url[256];
} SprinklerControl;
static SprinklerControl *Controls = 0;
static int ControlsCount = 0;
static int ControlsSize = 0;
static int ControlsActive = 0;
static SprinklerControl *housesprinkler_control_search (const char *name) {
int i;
if (!Controls) return 0;
for (i = 0; i < ControlsCount; ++i) {
if (!strcmp (name, Controls[i].name)) return Controls+i;
}
return 0;
}
void housesprinkler_control_reset (void) {
ControlsCount = 0;
}
void housesprinkler_control_declare (const char *name, const char *type) {
if (!housesprinkler_control_search(name)) {
if (ControlsCount >= ControlsSize) {
ControlsSize += 16;
Controls = realloc (Controls, ControlsSize*sizeof(SprinklerControl));
if (!Controls) {
houselog_trace (HOUSE_FAILURE, name, "no more memory");
ControlsSize = ControlsCount = 0;
return;
}
}
Controls[ControlsCount].name = name;
Controls[ControlsCount].type = type;
Controls[ControlsCount].status = 'u';
Controls[ControlsCount].event = 1; // enabled.
Controls[ControlsCount].once = 0; // .. until explicitly disabled.
Controls[ControlsCount].deadline = 0;
Controls[ControlsCount].url[0] = 0; // Need to (re)learn.
ControlsCount += 1;
}
}
void housesprinkler_control_event (const char *name, int enable, int once) {
SprinklerControl *control = housesprinkler_control_search(name);
if (control) {
control->event = enable;
control->once = once;
}
}
static void housesprinkler_control_result
(void *origin, int status, char *data, int length) {
SprinklerControl *control = (SprinklerControl *)origin;
status = echttp_redirected("GET");
if (!status) {
echttp_submit (0, 0, housesprinkler_control_result, origin);
return;
}
if (status != 200) {
if (control->status != 'e')
houselog_trace (HOUSE_FAILURE, control->name, "HTTP code %d", status);
control->status = 'e';
control->deadline = 0;
}
}
int housesprinkler_control_start (const char *name,
int pulse, const char *context) {
time_t now = time(0);
SprinklerControl *control = housesprinkler_control_search (name);
if (!control) {
houselog_event ("CONTROL", name, "UNKNOWN", "");
return 0;
}
DEBUG ("%ld: Start %s %s for %d seconds\n", now, control->type, name, pulse);
if (control->url[0]) {
if (!context || context[0] == 0) context = "MANUAL";
if (control->event) {
houselog_event (control->type, name, "ACTIVATED",
"FOR %s USING %s (%s)",
housesprinkler_time_period_printable(pulse),
control->url, context);
if (control->once) {
control->event = 0;
control->once = 0;
}
}
static char url[256];
static char cause[256];
int l = snprintf (cause, sizeof(cause), "%s", "SPRINKLER%20");
echttp_escape (context, cause+l, sizeof(cause)-l);
snprintf (url, sizeof(url),
"%s/set?point=%s&state=on&pulse=%d&cause=%s",
control->url, name, pulse, cause);
const char *error = echttp_client ("GET", url);
if (error) {
houselog_trace (HOUSE_FAILURE, name, "cannot create socket for %s, %s", url, error);
return 0;
}
DEBUG ("GET %s\n", url);
echttp_submit (0, 0, housesprinkler_control_result, (void *)control);
control->deadline = now + pulse;
control->status = 'a';
ControlsActive = 1;
return 1;
}
return 0;
}
static void housesprinkler_control_stop (SprinklerControl *control) {
if (control->url[0]) {
static char url[256];
snprintf (url, sizeof(url),
"%s/set?point=%s&state=off", control->url, control->name);
const char *error = echttp_client ("GET", url);
if (error) {
houselog_trace (HOUSE_FAILURE, control->name, "cannot create socket for %s, %s", url, error);
return;
}
DEBUG ("GET %s\n", url);
echttp_submit (0, 0, housesprinkler_control_result, (void *)control);
control->status = 'i';
}
}
void housesprinkler_control_cancel (const char *name) {
int i;
time_t now = time(0);
if (name) {
SprinklerControl *control = housesprinkler_control_search (name);
if (control) {
houselog_event (control->type, name, "CANCEL", "MANUAL");
housesprinkler_control_stop (control);
control->deadline = 0;
}
return;
}
DEBUG ("%ld: Cancel all zones and feeds\n", now);
for (i = 0; i < ControlsCount; ++i) {
if (Controls[i].deadline) {
housesprinkler_control_stop ( Controls + i);
Controls[i].deadline = 0;
}
}
ControlsActive = 0;
}
char housesprinkler_control_state (const char *name) {
SprinklerControl *control = housesprinkler_control_search (name);
if (!control) return 'e';
return control->status;
}
static void housesprinkler_control_discovered
(void *origin, int status, char *data, int length) {
const char *provider = (const char *) origin;
ParserToken tokens[100];
int innerlist[100];
char path[256];
int count = 100;
int i;
status = echttp_redirected("GET");
if (!status) {
echttp_submit (0, 0, housesprinkler_control_discovered, origin);
return;
}
if (status != 200) {
houselog_trace (HOUSE_FAILURE, provider, "HTTP error %d", status);
return;
}
// Analyze the answer and retrieve the control points matching ours.
const char *error = echttp_json_parse (data, tokens, &count);
if (error) {
houselog_trace
(HOUSE_FAILURE, provider, "JSON syntax error, %s", error);
return;
}
if (count <= 0) {
houselog_trace (HOUSE_FAILURE, provider, "no data");
return;
}
int controls = echttp_json_search (tokens, ".control.status");
if (controls <= 0) {
houselog_trace (HOUSE_FAILURE, provider, "no control data");
return;
}
int n = tokens[controls].length;
if (n <= 0) {
houselog_trace (HOUSE_FAILURE, provider, "empty control data");
return;
}
error = echttp_json_enumerate (tokens+controls, innerlist);
if (error) {
houselog_trace (HOUSE_FAILURE, path, "%s", error);
return;
}
for (i = 0; i < n; ++i) {
ParserToken *inner = tokens + controls + innerlist[i];
SprinklerControl *control = housesprinkler_control_search (inner->key);
if (!control) continue;
if (strcmp (control->url, provider)) {
snprintf (control->url, sizeof(control->url), provider);
control->status = 'i';
houselog_event (control->type, control->name, "ROUTE",
"TO %s", control->url);
}
}
}
static void housesprinkler_control_scan_server
(const char *service, void *context, const char *provider) {
char url[256];
if (ProvidersCount >= ProvidersAllocated) {
ProvidersAllocated += 64;
Providers = realloc (Providers, ProvidersAllocated*(sizeof(char *)));
}
Providers[ProvidersCount++] = strdup(provider); // Keep the string.
snprintf (url, sizeof(url), "%s/status", provider);
DEBUG ("Attempting discovery at %s\n", url);
const char *error = echttp_client ("GET", url);
if (error) {
houselog_trace (HOUSE_FAILURE, provider, "%s", error);
return;
}
echttp_submit (0, 0, housesprinkler_control_discovered, (void *)provider);
}
static void housesprinkler_control_discover (time_t now) {
static time_t latestdiscovery = 0;
if (!now) { // This is a manual reset (force a discovery refresh)
latestdiscovery = 0;
return;
}
// If any new service was detected, force a scan now.
//
if ((latestdiscovery > 0) &&
housediscover_changed ("control", latestdiscovery)) {
latestdiscovery = 0;
}
// Even if nothing new was detected, still scan every minute, in case
// the configuration of a service was changed.
//
if (now <= latestdiscovery + 60) return;
latestdiscovery = now;
// Rebuild the list of control servers, and then launch a discovery
// refresh. This way we don't walk a stale cache while doing discovery.
//
DEBUG ("Reset providers cache\n");
int i;
for (i = 0; i < ProvidersCount; ++i) {
if (Providers[i]) free(Providers[i]);
Providers[i] = 0;
}
ProvidersCount = 0;
DEBUG ("Proceeding with discovery\n");
housediscovered ("control", 0, housesprinkler_control_scan_server);
}
void housesprinkler_control_periodic (time_t now) {
int i;
if (ControlsCount <= 0) return;
if (ControlsActive) {
ControlsActive = 0;
for (i = 0; i < ControlsCount; ++i) {
if (Controls[i].deadline) {
if (Controls[i].deadline < now) {
// No request: it automatically stops on end of pulse.
Controls[i].deadline = 0;
Controls[i].status = 'i';
} else {
ControlsActive = 1;
}
}
}
}
housesprinkler_control_discover (now);
}
int housesprinkler_control_status (char *buffer, int size) {
int i;
int cursor = 0;
const char *prefix = "";
cursor = snprintf (buffer, size, "\"servers\":[");
if (cursor >= size) goto overflow;
for (i = 0; i < ProvidersCount; ++i) {
cursor += snprintf (buffer+cursor, size-cursor,
"%s\"%s\"", prefix, Providers[i]);
if (cursor >= size) goto overflow;
prefix = ",";
}
cursor += snprintf (buffer+cursor, size-cursor, "]");
if (cursor >= size) goto overflow;
cursor += snprintf (buffer+cursor, size-cursor, ",\"controls\":[");
if (cursor >= size) goto overflow;
prefix = "";
time_t now = time(0);
for (i = 0; i < ControlsCount; ++i) {
int remaining =
(Controls[i].status == 'a')?(int)(Controls[i].deadline - now):0;
cursor += snprintf (buffer+cursor, size-cursor, "%s[\"%s\",\"%s\",\"%c\",\"%s\",%d]",
prefix, Controls[i].name, Controls[i].type, Controls[i].status, Controls[i].url, remaining);
if (cursor >= size) goto overflow;
prefix = ",";
}
cursor += snprintf (buffer+cursor, size-cursor, "]");
if (cursor >= size) goto overflow;
return cursor;
overflow:
houselog_trace (HOUSE_FAILURE, "STATUS",
"BUFFER TOO SMALL (NEED %d bytes)", cursor);
buffer[0] = 0;
return 0;
}