Save system-wide variable on change

Author: pascal-fb-martin

housesprinkler_config.c

@@ -63,6 +63,13 @@
  *
  *    Get the name of the current configuration file, for informational
  *    purpose (e.g. error messages).
+ *
+ * long housesprinkler_config_backup_get (const char *path);
+ * void housesprinkler_config_backup_set (const char *path, long value);
+ *
+ *    Read from, and write to, the backup file. This backup file contains
+ *    a handful of saved values that are system-wide and can be changed
+ *    from the user interface. They are all integer type.
  */
 
 #include <string.h>
@@ -76,6 +83,7 @@
 #include <echttp_json.h>
 
 #include "houselog.h"
+
 #include "housesprinkler.h"
 #include "housesprinkler_config.h"
 
@@ -95,18 +103,52 @@ static const char FactoryDefaultsConfigFile[] =
                       "/usr/local/share/house/public/sprinkler/defaults.json";
 static int UseFactoryDefaults = 0;
 
+#define BACKUPMAXSIZE 32
+
+static ParserToken BackupParsed[BACKUPMAXSIZE];
+static int   BackupTokenCount = 0;
+static char *BackupText = 0;
+
+static const char *BackupFile = "/etc/house/sprinklerbkp.json";
+
+static const char FactoryBackupFile[] =
+                      "/usr/local/share/house/public/sprinkler/backup.json";
+
 
 const char *housesprinkler_config_load (int argc, const char **argv) {
 
     struct stat filestat;
     int fd;
-    const char *configname;
     char *newconfig;
 
     int i;
     for (i = 1; i < argc; ++i) {
-        if (echttp_option_match ("-config=", argv[i], &configname))
-            ConfigFile = strdup(configname);
+        if (echttp_option_match ("-config=", argv[i], &ConfigFile)) continue;
+        if (echttp_option_match ("-backup=", argv[i], &BackupFile)) continue;
+    }
+
+    DEBUG ("Loading backup from %s\n", BackupFile);
+    if (BackupText) echttp_parser_free (BackupText);
+    BackupText = 0;
+    BackupTokenCount = 0;
+    newconfig = echttp_parser_load (BackupFile);
+    if (!newconfig) {
+        DEBUG ("Loading backup from %s\n", FactoryBackupFile);
+        newconfig = echttp_parser_load (FactoryBackupFile);
+        houselog_event ("SYSTEM", "BACKUP", "LOAD",
+                        "FILE %s", FactoryBackupFile);
+    } else {
+        houselog_event ("SYSTEM", "BACKUP", "LOAD",
+                        "FILE %s", BackupFile);
+    }
+    if (newconfig) {
+        BackupText = newconfig;
+        BackupTokenCount = BACKUPMAXSIZE;
+        if (echttp_json_parse (BackupText, BackupParsed, &BackupTokenCount)) {
+            echttp_parser_free (BackupText);
+            BackupText = 0;
+            BackupTokenCount = 0;
+        }
     }
 
     DEBUG ("Loading config from %s\n", ConfigFile);
@@ -247,3 +289,26 @@ const char *housesprinkler_config_name (void) {
     return ConfigFile;
 }
 
+long housesprinkler_config_backup_get (const char *path) {
+
+    int i = echttp_json_search(BackupParsed, path);
+    return (i >= 0) ? BackupParsed[i].value.integer : 0;
+}
+
+void housesprinkler_config_backup_set (const char *path, long value) {
+
+    char buffer[1024];
+    int i = echttp_json_search(BackupParsed, path);
+
+    if (i < 0) return;
+    BackupParsed[i].value.integer = value;
+
+    if (echttp_json_format (BackupParsed, BackupTokenCount,
+                            buffer, sizeof(buffer), 0)) return;
+
+    int fd = open (BackupFile, O_WRONLY|O_TRUNC|O_CREAT, 0777);
+    if (fd < 0) return;
+    write (fd, buffer, strlen(buffer));
+    close(fd);
+}
+

housesprinkler_config.h

@@ -38,3 +38,6 @@ int housesprinkler_config_object       (int parent, const char *path);
 
 const char *housesprinkler_config_name (void);
 
+long housesprinkler_config_backup_get (const char *path);
+void housesprinkler_config_backup_set (const char *path, long value);
+

housesprinkler_program.c

@@ -299,6 +299,9 @@ void housesprinkler_program_refresh (void) {
                    Programs[i].name, Programs[i].start.hour, Programs[i].start.minute, count);
         }
     }
+
+    SprinklerState = housesprinkler_config_backup_get (".on");
+    ProgramRainDelay = (time_t)housesprinkler_config_backup_get (".raindelay");
 }
 
 void housesprinkler_program_index (int state) {
@@ -315,7 +318,10 @@ void housesprinkler_program_set_index
 
 void housesprinkler_program_rain (int enabled) {
     ProgramRainEnabled = enabled;
-    if (!enabled) ProgramRainDelay;
+    if (!enabled) {
+        ProgramRainDelay = 0;
+        housesprinkler_config_backup_set (".raindelay", 0);
+    }
 }
 
 void housesprinkler_program_set_rain (int delay) {
@@ -337,6 +343,7 @@ void housesprinkler_program_set_rain (int delay) {
         // This is an extension to the ongoing rain delay period.
         ProgramRainDelay += delay;
     }
+    housesprinkler_config_backup_set (".raindelay", (long)ProgramRainDelay);
 }
 
 static void housesprinkler_program_activate
@@ -513,6 +520,7 @@ void housesprinkler_program_switch (void) {
     time_t now = time(0);
     SprinklerState = !SprinklerState;
     houselog_event ("PROGRAM", "SWITCH", SprinklerState?"ON":"OFF", "");
+    housesprinkler_config_backup_set (".on", SprinklerState);
 }
 
 int housesprinkler_program_status (char *buffer, int size) {

public/backup.json

@@ -0,0 +1,2 @@
+{"on":1,"raindelay":0}
+