TBASE-1423: single meter subscription

src/system/detail/src/vnodeRead.c

@@ -630,7 +630,13 @@ void *vnodeQueryOnSingleTable(SMeterObj **pMetersObj, SSqlGroupbyExpr *pGroupbyE
   pQuery = &(pQInfo->query);
   dTrace("qmsg:%p create QInfo:%p, QInfo created", pQueryMsg, pQInfo);
 
-  pQuery->skey = pQueryMsg->skey;
+  SMeterSidExtInfo** pSids = (SMeterSidExtInfo**)pQueryMsg->pSidExtInfo;
+  if (pSids != NULL && pSids[0]->key > 0) {
+    pQuery->skey = pSids[0]->key;
+  } else {
+    pQuery->skey = pQueryMsg->skey;
+  }
+
   pQuery->ekey = pQueryMsg->ekey;
   pQuery->lastKey = pQuery->skey;
 

src/system/detail/src/vnodeShell.c

@@ -444,6 +444,8 @@ void vnodeExecuteRetrieveReq(SSchedMsg *pSched) {
   int progressSize = 0;
   if (pQInfo->pMeterQuerySupporter != NULL)
     progressSize = pQInfo->pMeterQuerySupporter->numOfMeters * (sizeof(int64_t) + sizeof(TSKEY)) + sizeof(int32_t);
+  else if (pQInfo->pObj != NULL)
+    progressSize = sizeof(int64_t) + sizeof(TSKEY) + sizeof(int32_t);
 
   pStart = taosBuildRspMsgWithSize(pObj->thandle, TSDB_MSG_TYPE_RETRIEVE_RSP, progressSize + size + 100);
   if (pStart == NULL) {
@@ -478,7 +480,7 @@ void vnodeExecuteRetrieveReq(SSchedMsg *pSched) {
 
   // write the progress information of each meter to response
   // this is required by subscriptions
-  if (progressSize > 0) {
+  if (pQInfo->pMeterQuerySupporter != NULL) {
     *((int32_t*)pMsg) = htonl(pQInfo->pMeterQuerySupporter->numOfMeters);
     pMsg += sizeof(int32_t);
     for (int32_t i = 0; i < pQInfo->pMeterQuerySupporter->numOfMeters; i++) {
@@ -487,6 +489,13 @@ void vnodeExecuteRetrieveReq(SSchedMsg *pSched) {
       *((TSKEY*)pMsg) = htobe64(pQInfo->pMeterQuerySupporter->pMeterSidExtInfo[i]->key);
       pMsg += sizeof(TSKEY);
     }
+  } else if (pQInfo->pObj != NULL) {
+    *((int32_t*)pMsg) = htonl(1);
+    pMsg += sizeof(int32_t);
+    *((int64_t*)pMsg) = htobe64(pQInfo->pObj->uid);
+    pMsg += sizeof(int64_t);
+    *((TSKEY*)pMsg) = htobe64(pQInfo->query.lastKey);
+    pMsg += sizeof(TSKEY);
   }
 
   msgLen = pMsg - pStart;

tests/examples/c/makefile

@@ -4,16 +4,17 @@
 ROOT=./
 TARGET=exe
 LFLAGS = '-Wl,-rpath,/usr/local/taos/driver/' -ltaos -lpthread -lm -lrt
+#LFLAGS = '-Wl,-rpath,/home/zbm/project/td/debug/build/lib/' -L/home/zbm/project/td/debug/build/lib -ltaos -lpthread -lm -lrt
 CFLAGS = -O3 -g -Wall -Wno-deprecated -fPIC -Wno-unused-result -Wconversion -Wno-char-subscripts -D_REENTRANT -Wno-format -D_REENTRANT -DLINUX -msse4.2 -Wno-unused-function -D_M_X64 \
 	-I/usr/local/taos/include -std=gnu99
 
 all: $(TARGET)
 
 exe:
-gcc $(CFLAGS) ./asyncdemo.c -o $(ROOT)/asyncdemo $(LFLAGS)
-gcc $(CFLAGS) ./demo.c -o $(ROOT)/demo $(LFLAGS)
-gcc $(CFLAGS) ./prepare.c -o $(ROOT)/prepare $(LFLAGS)
-gcc $(CFLAGS) ./stream.c -o $(ROOT)/stream $(LFLAGS)
+	gcc $(CFLAGS) ./asyncdemo.c -o $(ROOT)/asyncdemo $(LFLAGS)
+	gcc $(CFLAGS) ./demo.c -o $(ROOT)/demo $(LFLAGS)
+	gcc $(CFLAGS) ./prepare.c -o $(ROOT)/prepare $(LFLAGS)
+	gcc $(CFLAGS) ./stream.c -o $(ROOT)/stream $(LFLAGS)
 	gcc $(CFLAGS) ./subscribe.c -o $(ROOT)subscribe $(LFLAGS)
 
 clean:

tests/examples/c/subscribe.c

@@ -28,6 +28,7 @@ int main(int argc, char *argv[]) {
   const char* host = "127.0.0.1";
   const char* user = "root";
   const char* passwd = "taosdata";
+  const char* sql = "select * from meters;";
   int async = 1, restart = 0;
   TAOS_SUB* tsub = NULL;
 
@@ -52,6 +53,10 @@ int main(int argc, char *argv[]) {
       restart = 1;
       continue;
     }
+    if (strcmp(argv[i], "-single") == 0) {
+      sql = "select * from t0;";
+      continue;
+    }
   }
 
   // init TAOS
@@ -64,9 +69,9 @@ int main(int argc, char *argv[]) {
   }
 
   if (async) {
-    tsub = taos_subscribe("test", restart, taos, "select * from meters;", subscribe_callback, NULL, 1000);
+    tsub = taos_subscribe("test", restart, taos, sql, subscribe_callback, NULL, 1000);
   } else {
-    tsub = taos_subscribe("test", restart, taos, "select * from meters;", NULL, NULL, 0);
+    tsub = taos_subscribe("test", restart, taos, sql, NULL, NULL, 0);
   }
 
   if (tsub == NULL) {