fix(util): fix race condition.

include/util/tconfig.h

@@ -106,12 +106,15 @@ int32_t      cfgLoad(SConfig *pCfg, ECfgSrcType cfgType, const void *sourceStr);
 int32_t      cfgLoadFromArray(SConfig *pCfg, SArray *pArgs);  // SConfigPair
 void         cfgCleanup(SConfig *pCfg);
 int32_t      cfgGetSize(SConfig *pCfg);
-SConfigItem *cfgGetItem(SConfig *pCfg, const char *name);
+SConfigItem *cfgGetItem(SConfig *pCfg, const char *pName);
 int32_t      cfgSetItem(SConfig *pCfg, const char *name, const char *value, ECfgSrcType stype);
 int32_t      cfgCheckRangeForDynUpdate(SConfig *pCfg, const char *name, const char *pVal, bool isServer);
+
 SConfigIter *cfgCreateIter(SConfig *pConf);
 SConfigItem *cfgNextIter(SConfigIter *pIter);
 void         cfgDestroyIter(SConfigIter *pIter);
+void         cfgLock(SConfig *pCfg);
+void         cfgUnLock(SConfig *pCfg);
 
 // clang-format off
 int32_t cfgAddBool(SConfig *pCfg, const char *name, bool defaultVal, int8_t scope, int8_t dynScope);

source/common/src/tglobal.c

@@ -1515,15 +1515,20 @@ static int32_t taosCfgDynamicOptionsForServer(SConfig *pCfg, const char *name) {
     return 0;
   }
 
+  cfgLock(pCfg);
+
   SConfigItem *pItem = cfgGetItem(pCfg, name);
   if (!pItem || (pItem->dynScope & CFG_DYN_SERVER) == 0) {
     uError("failed to config:%s, not support", name);
     terrno = TSDB_CODE_INVALID_CFG;
+
+    cfgUnLock(pCfg);
     return -1;
   }
 
   if (strncasecmp(name, "debugFlag", 9) == 0) {
     taosSetAllDebugFlag(pCfg, pItem->i32);
+    cfgUnLock(pCfg);
     return 0;
   }
 
@@ -1580,17 +1585,21 @@ static int32_t taosCfgDynamicOptionsForServer(SConfig *pCfg, const char *name) {
     }
   }
 
+  cfgUnLock(pCfg);
   return terrno == TSDB_CODE_SUCCESS ? 0 : -1;
 }
 
-// todo fix race condition caused by update of config, pItem->str may be removed
 static int32_t taosCfgDynamicOptionsForClient(SConfig *pCfg, const char *name) {
   terrno = TSDB_CODE_SUCCESS;
 
+  cfgLock(pCfg);
+
   SConfigItem *pItem = cfgGetItem(pCfg, name);
   if ((pItem == NULL) || (pItem->dynScope & CFG_DYN_CLIENT) == 0) {
     uError("failed to config:%s, not support", name);
     terrno = TSDB_CODE_INVALID_CFG;
+
+    cfgUnLock(pCfg);
     return -1;
   }
 
@@ -1728,6 +1737,7 @@ static int32_t taosCfgDynamicOptionsForClient(SConfig *pCfg, const char *name) {
         matched = true;
       } else if (strcasecmp("slowLogScope", name) == 0) {
         if (taosSetSlowLogScope(pItem->str)) {
+          cfgUnLock(pCfg);
           return -1;
         }
         uInfo("%s set to %s", name, pItem->str);
@@ -1747,6 +1757,7 @@ static int32_t taosCfgDynamicOptionsForClient(SConfig *pCfg, const char *name) {
         taosExpandDir(tsTempDir, tsTempDir, PATH_MAX);
         if (taosMulMkDir(tsTempDir) != 0) {
           uError("failed to create tempDir:%s since %s", tsTempDir, terrstr());
+          cfgUnLock(pCfg);
           return -1;
         }
         matched = true;
@@ -1802,6 +1813,7 @@ static int32_t taosCfgDynamicOptionsForClient(SConfig *pCfg, const char *name) {
   }
 
 _out:
+  cfgUnLock(pCfg);
   return terrno == TSDB_CODE_SUCCESS ? 0 : -1;
 }
 
@@ -1844,6 +1856,8 @@ static void taosSetAllDebugFlag(SConfig *pCfg, int32_t flag) {
     return;
   }
 
+  cfgLock(pCfg);
+
   SArray      *noNeedToSetVars = NULL;
   SConfigItem *pItem = cfgGetItem(pCfg, "debugFlag");
   if (pItem != NULL) {
@@ -1878,7 +1892,11 @@ static void taosSetAllDebugFlag(SConfig *pCfg, int32_t flag) {
   taosArrayClear(noNeedToSetVars);  // reset array
 
   uInfo("all debug flag are set to %d", flag);
-  if (terrno == TSDB_CODE_CFG_NOT_FOUND) terrno = TSDB_CODE_SUCCESS;  // ignore not exist
+  if (terrno == TSDB_CODE_CFG_NOT_FOUND) {
+    terrno = TSDB_CODE_SUCCESS;  // ignore not exist
+  }
+
+  cfgUnLock(pCfg);
 }
 
 int8_t taosGranted(int8_t type) {

source/util/src/tconfig.c

@@ -88,7 +88,7 @@ int32_t cfgLoadFromArray(SConfig *pCfg, SArray *pArgs) {
   return 0;
 }
 
-static void cfgFreeItem(SConfigItem *pItem) {
+void cfgItemFreeVal(SConfigItem *pItem) {
   if (pItem->dtype == CFG_DTYPE_STRING || pItem->dtype == CFG_DTYPE_DIR || pItem->dtype == CFG_DTYPE_LOCALE ||
       pItem->dtype == CFG_DTYPE_CHARSET || pItem->dtype == CFG_DTYPE_TIMEZONE) {
     taosMemoryFreeClear(pItem->str);
@@ -100,23 +100,26 @@ static void cfgFreeItem(SConfigItem *pItem) {
 }
 
 void cfgCleanup(SConfig *pCfg) {
-  if (pCfg != NULL) {
+  if (pCfg == NULL) {
+    return;
+  }
+
   int32_t size = taosArrayGetSize(pCfg->array);
   for (int32_t i = 0; i < size; ++i) {
     SConfigItem *pItem = taosArrayGet(pCfg->array, i);
-      cfgFreeItem(pItem);
+    cfgItemFreeVal(pItem);
     taosMemoryFreeClear(pItem->name);
   }
+
   taosArrayDestroy(pCfg->array);
   taosThreadMutexDestroy(&pCfg->lock);
   taosMemoryFree(pCfg);
 }
-}
 
 int32_t cfgGetSize(SConfig *pCfg) { return taosArrayGetSize(pCfg->array); }
 
 static int32_t cfgCheckAndSetConf(SConfigItem *pItem, const char *conf) {
-  cfgFreeItem(pItem);
+  cfgItemFreeVal(pItem);
   ASSERT(pItem->str == NULL);
 
   pItem->str = taosStrdup(conf);
@@ -257,13 +260,21 @@ static int32_t cfgSetTimezone(SConfigItem *pItem, const char *value, ECfgSrcType
 
 static int32_t cfgSetTfsItem(SConfig *pCfg, const char *name, const char *value, const char *level, const char *primary,
                              ECfgSrcType stype) {
+  taosThreadMutexLock(&pCfg->lock);
+
   SConfigItem *pItem = cfgGetItem(pCfg, name);
-  if (pItem == NULL) return -1;
+  if (pItem == NULL) {
+    taosThreadMutexUnlock(&pCfg->lock);
+
+    return -1;
+  }
 
   if (pItem->array == NULL) {
     pItem->array = taosArrayInit(16, sizeof(SDiskCfg));
     if (pItem->array == NULL) {
       terrno = TSDB_CODE_OUT_OF_MEMORY;
+      taosThreadMutexUnlock(&pCfg->lock);
+
       return -1;
     }
   }
@@ -275,10 +286,14 @@ static int32_t cfgSetTfsItem(SConfig *pCfg, const char *name, const char *value,
   void *ret = taosArrayPush(pItem->array, &cfg);
   if (ret == NULL) {
     terrno = TSDB_CODE_OUT_OF_MEMORY;
+    taosThreadMutexUnlock(&pCfg->lock);
+
     return -1;
   }
 
   pItem->stype = stype;
+  taosThreadMutexUnlock(&pCfg->lock);
+
   return 0;
 }
 
@@ -313,14 +328,15 @@ static int32_t cfgUpdateDebugFlagItem(SConfig *pCfg, const char *name, bool rese
 int32_t cfgSetItem(SConfig *pCfg, const char *name, const char *value, ECfgSrcType stype) {
   // GRANT_CFG_SET;
   int32_t code = 0;
+  taosThreadMutexLock(&pCfg->lock);
+
   SConfigItem *pItem = cfgGetItem(pCfg, name);
   if (pItem == NULL) {
     terrno = TSDB_CODE_CFG_NOT_FOUND;
+    taosThreadMutexUnlock(&pCfg->lock);
     return -1;
   }
 
-  taosThreadMutexLock(&pCfg->lock);
-
   switch (pItem->dtype) {
     case CFG_DTYPE_BOOL: {
       code = cfgSetBool(pItem, value, stype);
@@ -369,12 +385,12 @@ int32_t cfgSetItem(SConfig *pCfg, const char *name, const char *value, ECfgSrcTy
   return code;
 }
 
-SConfigItem *cfgGetItem(SConfig *pCfg, const char *name) {
+SConfigItem *cfgGetItem(SConfig *pCfg, const char *pName) {
   if (pCfg == NULL) return NULL;
   int32_t size = taosArrayGetSize(pCfg->array);
   for (int32_t i = 0; i < size; ++i) {
     SConfigItem *pItem = taosArrayGet(pCfg->array, i);
-    if (strcasecmp(pItem->name, name) == 0) {
+    if (strcasecmp(pItem->name, pName) == 0) {
       return pItem;
     }
   }
@@ -383,9 +399,23 @@ SConfigItem *cfgGetItem(SConfig *pCfg, const char *name) {
   return NULL;
 }
 
+void cfgLock(SConfig *pCfg) {
+  if (pCfg == NULL) {
+    return;
+  }
+
+  taosThreadMutexLock(&pCfg->lock);
+}
+
+void cfgUnLock(SConfig *pCfg) {
+  taosThreadMutexUnlock(&pCfg->lock);
+}
+
 int32_t cfgCheckRangeForDynUpdate(SConfig *pCfg, const char *name, const char *pVal, bool isServer) {
   ECfgDynType  dynType = isServer ? CFG_DYN_SERVER : CFG_DYN_CLIENT;
 
+  cfgLock(pCfg);
+
   SConfigItem *pItem = cfgGetItem(pCfg, name);
   if (!pItem || (pItem->dynScope & dynType) == 0) {
     uError("failed to config:%s, not support update this config", name);
@@ -439,6 +469,7 @@ int32_t cfgCheckRangeForDynUpdate(SConfig *pCfg, const char *name, const char *p
     default:
       break;
   }
+
   return 0;
 }
 
@@ -1057,8 +1088,7 @@ int32_t cfgLoadFromCfgFile(SConfig *pConfig, const char *filepath) {
 
       code = cfgSetItem(pConfig, name, newValue, CFG_STYPE_CFG_FILE);
       if (code != 0 && terrno != TSDB_CODE_CFG_NOT_FOUND) break;
-    }
+    } else {
-    else{
       paGetToken(value + vlen + 1, &value2, &vlen2);
       if (vlen2 != 0) {
         value2[vlen2] = 0;