Version 0.1.5 - introduced new DB API

HISTORY

@@ -33,3 +33,6 @@ Version 0.1.3
 
 Version 0.1.4
 - added ScraperGetPosterBannerV2 Service
+
+Versionn 0.1.5
+- introduced new DB API

lib/common.h

@@ -11,6 +11,7 @@
 #include <stdint.h>      // uint_64_t
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 #include <string>
 
 #include <openssl/md5.h> // MD5_*
@@ -280,5 +281,147 @@ class LogDuration
       int logLevel;
 };
 
+//***************************************************************************
+// Semaphore
+//***************************************************************************
+
+#include <sys/sem.h>
+
+class Sem
+{
+   public:
+
+      Sem(key_t aKey)
+      {
+         locked = no;
+         key = aKey;
+
+         if ((id = semget(key, 1, 0666 | IPC_CREAT)) == -1)
+            tell(0, "Error: Can't get semaphore, errno (%d) '%s'", 
+                 errno, strerror(errno));
+      }
+
+      ~Sem() 
+      { 
+         if (locked)
+            v();
+      }
+
+      // ----------------------
+      // get lock
+
+      int p()
+      {
+         sembuf sops[2];
+         
+         sops[0].sem_num = 0;
+         sops[0].sem_op = 0;                        // wait for lock
+         sops[0].sem_flg = SEM_UNDO;
+         
+         sops[1].sem_num = 0;
+         sops[1].sem_op = 1;                        // increment 
+         sops[1].sem_flg = SEM_UNDO | IPC_NOWAIT;
+         
+         if (semop(id, sops, 2) == -1)
+         {
+            tell(0, "Error: Can't lock semaphore, errno (%d) '%s'", 
+                 errno, strerror(errno));
+            
+            return fail;
+         }
+
+         locked = yes;
+
+         return success;
+      }
+
+      // ----------------------
+      // increment
+
+      int inc()
+      {
+         sembuf sops[1];
+         
+         sops[0].sem_num = 0;
+         sops[0].sem_op = 1;                        // increment 
+         sops[0].sem_flg = SEM_UNDO | IPC_NOWAIT;
+         
+         if (semop(id, sops, 1) == -1)
+         {
+            if (errno != EAGAIN)
+               tell(0, "Error: Can't lock semaphore, errno was (%d) '%s'", 
+                    errno, strerror(errno));
+            
+            return fail;
+         }
+         
+         locked = yes;
+
+         return success;
+      }
+
+      // ----------------------
+      // decrement
+
+      int dec()
+      {
+         return v();
+      }
+
+      // ----------------------
+      // check
+
+      int check()
+      {
+         sembuf sops[1];
+         
+         sops[0].sem_num = 0;
+         sops[0].sem_op = 0; 
+         sops[0].sem_flg = SEM_UNDO | IPC_NOWAIT;
+         
+         if (semop(id, sops, 1) == -1)
+         {
+            if (errno != EAGAIN)
+               tell(0, "Error: Can't lock semaphore, errno was (%d) '%s'", 
+                    errno, strerror(errno));
+            
+            return fail;
+         }
+         
+         return success;
+      }
+
+      // ----------------------
+      // release lock
+
+      int v()
+      {
+         sembuf sops;
+         
+         sops.sem_num = 0;
+         sops.sem_op = -1;                          // release control
+         sops.sem_flg = SEM_UNDO | IPC_NOWAIT;
+         
+         if (semop(id, &sops, 1) == -1)
+         {
+            if (errno != EAGAIN)
+               tell(0, "Error: Can't unlock semaphore, errno (%d) '%s'",
+                    errno, strerror(errno));
+            
+            return fail;
+         }
+         
+         locked = no;
+
+         return success;
+      }
+      
+   private:
+
+      key_t key;
+      int id;
+      int locked;
+};
+
 //***************************************************************************
 #endif //___COMMON_H

lib/config.h

@@ -11,6 +11,8 @@
 
 #include "common.h"
 
+#define EPG_PLUGIN_SEM_KEY 0x3db00001
+
 //***************************************************************************
 // Config
 //***************************************************************************

lib/db.c

@@ -512,6 +512,7 @@ int   cDbConnection::dbPort = 3306;
 char* cDbConnection::dbUser = 0;
 char* cDbConnection::dbPass = 0;
 char* cDbConnection::dbName = 0;
+Sem*  cDbConnection::sem = 0;
 
 //***************************************************************************
 // Object

lib/db.h

@@ -8,11 +8,15 @@
 #ifndef __DB_H
 #define __DB_H
 
+#include <linux/unistd.h>
+
+#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <errno.h>
+
 #include <mysql/mysql.h>
 
 #include <list>
@@ -550,13 +554,11 @@ class cDbConnection
 
       virtual ~cDbConnection()
       {
-         if (mysql) 
+         close();
-         {
-            mysql_close(mysql);
-            mysql_thread_end();
-         }
       }
 
+      int isConnected() { return getMySql() > 0; }
+
       int attachConnection()
       { 
          static int first = yes;
@@ -565,14 +567,16 @@ class cDbConnection
          {
             connectDropped = yes;
 
+            tell(0, "Calling mysql_init(%ld)", syscall(__NR_gettid));
+
             if (!(mysql = mysql_init(0)))
                return errorSql(this, "attachConnection(init)");
 
             if (!mysql_real_connect(mysql, dbHost, 
                                     dbUser, dbPass, dbName, dbPort, 0, 0)) 
             {
-               mysql_close(mysql);
+               close();
-               mysql = 0;
+
                tell(0, "Error, connecting to database at '%s' on port (%d) failed",
                     dbHost, dbPort);
 
@@ -601,19 +605,25 @@ class cDbConnection
          return success; 
       }
 
-      void detachConnection()
+      void close()
       {
-         attached--;
+         if (mysql)
+         {
+            tell(0, "Closing mysql connection and calling mysql_thread_end(%ld)", syscall(__NR_gettid));
 
-         if (!attached)
-         {
             mysql_close(mysql);
             mysql_thread_end();
             mysql = 0;
          }
       }
 
-      int isConnected() { return getMySql() > 0; }
+      void detachConnection()
+      { 
+         attached--;
+
+         if (!attached)
+            close();
+      }
 
       int check()
       {
@@ -724,12 +734,7 @@ class cDbConnection
       MYSQL* getMySql()
       {
          if (connectDropped && mysql)
-         {
+            close();
-            mysql_close(mysql);
-            mysql_thread_end();
-            mysql = 0;
-            attached = 0;
-         }
 
          return mysql; 
       }
@@ -758,20 +763,57 @@ class cDbConnection
 
       void showStat(const char* name = "")           { statements.showStat(name); }
 
-      static int init()
+      // -----------------------------------------------------------
+      // init() and exit() must exactly called 'once' per process
+
+      static int init(key_t semKey)
       {
+         if (semKey && !sem)
+            sem = new Sem(semKey);
+
+         if (!sem || sem->check() == success)
+         {
+            // call only once per process
+
+            if (sem)
+               tell(1, "Info: Calling mysql_library_init()");
+
             if (mysql_library_init(0, 0, 0)) 
             {
-            tell(0, "Error: mysql_library_init failed");
+               tell(0, "Error: mysql_library_init() failed");
-            return fail;  // return errorSql(0, "init(library_init)");
+               return fail;
             }
+         }
+         else if (sem)
+         {
+            tell(1, "Info: Skipping calling mysql_library_init(), it's already done!");
+         }
+
+         if (sem)
+            sem->inc();  // count usage per process
 
          return success;
       }
 
       static int exit()
       {
+         mysql_thread_end();
+
+         if (sem)
+            sem->dec();
+         
+         if (!sem || sem->check() == success)
+         {
+            if (sem)
+               tell(1, "Info: Released the last usage of mysql_lib, calling mysql_library_end() now");
+
             mysql_library_end();
+         }
+         else if (sem)
+         {
+            tell(1, "Info: The mysql_lib is still in use, skipping mysql_library_end() call");
+         }
+
          free(dbHost);
          free(dbUser);
          free(dbPass);
@@ -792,6 +834,8 @@ class cDbConnection
       int inTact;
       int connectDropped;
 
+      static Sem* sem;
+
       static char* encoding;
 
       // connecting data

lib/demo.c

@@ -15,7 +15,7 @@ const char* logPrefix = "demo";
 
 void initConnection()
 {
-   cDbConnection::init();
+   cDbConnection::init(0x3db00012);
 
    cDbConnection::setEncoding("utf8");
    cDbConnection::setHost("localhost");

lib/tabledef.c

@@ -117,9 +117,9 @@ cDbService::FieldDef cTableEvents::fields[] =
 
    // episodes (constable)
 
-   { "episode",          ffAscii,    250, fiEpisode,          ftData },
+//   { "episodecompname",          ffAscii,    250, fiEpisode,          ftData },
-   { "episodepart",      ffAscii,    250, fiEpisodePart,      ftData },
+//   { "episodecomppartname",      ffAscii,    250, fiEpisodePart,      ftData },
-   { "episodelang",      ffAscii,      3, fiEpisodeLang,      ftData },
+//   { "episodelang",      ffAscii,      3, fiEpisodeLang,      ftData },
 
    // tv scraper
 

lib/tabledef.h

@@ -251,9 +251,9 @@ class cTableEvents : public cDbTable
          fiExtEpNum,
          fiImageCount,
 
-         fiEpisode,
+//         fiEpisode,
-         fiEpisodePart,
+//         fiEpisodePart,
-         fiEpisodeLang,
+//         fiEpisodeLang,
 
          fiScrSeriesId,
          fiScrSeriesEpisode,

lib/test.c

@@ -21,7 +21,7 @@ const char* logPrefix = "test";
 
 void initConnection()
 {
-   cDbConnection::init();
+   cDbConnection::init(0x3db00011);
 
    cDbConnection::setEncoding("utf8");
    cDbConnection::setHost("localhost");

scraper2vdr.c

@@ -6,7 +6,10 @@
  * $Id$
  */
 
+#include "lib/config.h"
+
 #include "scraper2vdr.h"
+
 const char* logPrefix = LOG_PREFIX;
 
 #if defined (APIVERSNUM) && (APIVERSNUM < 10600)
@@ -80,7 +83,7 @@ eOSState cScraper2VdrPluginMenu::ProcessKey(eKeys key) {
 //***************************************************************************
 
 cPluginScraper2vdr::cPluginScraper2vdr(void) {
-    cDbConnection::init();
+    cDbConnection::init(EPG_PLUGIN_SEM_KEY);
 }
 
 cPluginScraper2vdr::~cPluginScraper2vdr() {

scraper2vdr.h

@@ -13,7 +13,7 @@
 //***************************************************************************
 // Constants
 //***************************************************************************
-static const char *VERSION        = "0.1.4";
+static const char *VERSION        = "0.1.5";
 static const char *DESCRIPTION    = "'scraper2vdr' plugin";
 static const char *MAINMENUENTRY  = "Scraper2Vdr";
 

scrapmanager.c

@@ -354,7 +354,7 @@ void cScrapManager::DumpMovies(void) {
 }
 
 void cScrapManager::DumpRecordings(void) {
-	tell(0, "%d recordings in memory:", recordings.size());
+	tell(0, "%ld recordings in memory:", recordings.size());
 	for (map<sRecordingsKey, sEventsValue>::iterator it = recordings.begin(); it != recordings.end(); it++) {
 		sRecordingsKey key = it->first;
 		sEventsValue val = it->second;
@@ -481,6 +481,7 @@ bool cScrapManager::GetMovie(cMovie *m) {
 
 bool cScrapManager::GetPosterBanner(ScraperGetPosterBanner *call) {
     sEventsValue v;
+    v.episodeId = 0;
     if (call->event) {
         sEventsKey k;
         k.eventId = call->event->EventID();
@@ -516,6 +517,7 @@ bool cScrapManager::GetPosterBanner(ScraperGetPosterBanner *call) {
 
 bool cScrapManager::GetPosterBannerV2(ScraperGetPosterBannerV2 *call) {
     sEventsValue v;
+    v.episodeId = 0;
     if (call->event) {
         sEventsKey k;
         k.eventId = call->event->EventID();

update.c

@@ -77,7 +77,6 @@ cUpdate::cUpdate(cScrapManager *manager) : cThread("update thread started", true
 cUpdate::~cUpdate() {
     if (loopActive)
         Stop();
-    exitDb();
 }
 
 // global field definitions
@@ -1356,6 +1355,8 @@ void cUpdate::Action()
 
         worked = no;
     }
+
+    exitDb();             // don't call exit in dtor, outside from thread!!
     loopActive = no;
     tell(0, "Update thread ended (pid=%d)", getpid());
 }