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Merge pull request #1990 from taosdata/enhance/cq 

set up DB connection only when there is a continuous query
This commit is contained in:
Shengliang Guan 2020-05-22 10:38:53 +08:00 committed by GitHub
parent 0812c3d811 42e44b4b00
commit 71c26d5c7c
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 33 additions and 27 deletions
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60
src/cq/src/cqMain.c
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@ -40,6 +40,7 @@ typedef struct {
int num; // number of continuous streams
struct SCqObj *pHead;
void *dbConn;
int master;
pthread_mutex_t mutex;
} SCqContext;
@ -58,6 +59,7 @@ typedef struct SCqObj {
int cqDebugFlag = 135;
static void cqProcessStreamRes(void *param, TAOS_RES *tres, TAOS_ROW row);
static void cqCreateStream(SCqContext *pContext, SCqObj *pObj);
void *cqOpen(void *ahandle, const SCqCfg *pCfg) {
@ -69,6 +71,7 @@ void *cqOpen(void *ahandle, const SCqCfg *pCfg) {
pContext->vgId = pCfg->vgId;
pContext->cqWrite = pCfg->cqWrite;
pContext->ahandle = ahandle;
tscEmbedded = 1;
pthread_mutex_init(&pContext->mutex, NULL);
@ -84,6 +87,8 @@ void cqClose(void *handle) {
cqStop(pContext);
// free all resources
pthread_mutex_lock(&pContext->mutex);
SCqObj *pObj = pContext->pHead;
while (pObj) {
SCqObj *pTemp = pObj;
@ -91,6 +96,8 @@ void cqClose(void *handle) {
free(pTemp);
}
pthread_mutex_unlock(&pContext->mutex);
pthread_mutex_destroy(&pContext->mutex);
cTrace("vgId:%d, CQ is closed", pContext->vgId);
@ -100,28 +107,15 @@ void cqClose(void *handle) {
void cqStart(void *handle) {
SCqContext *pContext = handle;
cTrace("vgId:%d, start all CQs", pContext->vgId);
if (pContext->dbConn) return;
if (pContext->dbConn || pContext->master) return;
pthread_mutex_lock(&pContext->mutex);
tscEmbedded = 1;
pContext->dbConn = taos_connect("localhost", pContext->user, pContext->pass, NULL, 0);
if (pContext->dbConn == NULL) {
cError("vgId:%d, failed to connect to TDengine(%s)", pContext->vgId, tstrerror(terrno));
pthread_mutex_unlock(&pContext->mutex);
return;
}
pContext->master = 1;
SCqObj *pObj = pContext->pHead;
while (pObj) {
int64_t lastKey = 0;
pObj->pStream = taos_open_stream(pContext->dbConn, pObj->sqlStr, cqProcessStreamRes, lastKey, pObj, NULL);
if (pObj->pStream) {
pContext->num++;
cTrace("vgId:%d, id:%d CQ:%s is openned", pContext->vgId, pObj->tid, pObj->sqlStr);
} else {
cError("vgId:%d, id:%d CQ:%s, failed to open", pContext->vgId, pObj->tid, pObj->sqlStr);
}
cqCreateStream(pContext, pObj);
pObj = pObj->next;
}
@ -131,10 +125,11 @@ void cqStart(void *handle) {
void cqStop(void *handle) {
SCqContext *pContext = handle;
cTrace("vgId:%d, stop all CQs", pContext->vgId);
if (pContext->dbConn == NULL) return;
if (pContext->dbConn == NULL || pContext->master == 0) return;
pthread_mutex_lock(&pContext->mutex);
pContext->master = 0;
SCqObj *pObj = pContext->pHead;
while (pObj) {
if (pObj->pStream) {
@ -176,16 +171,7 @@ void *cqCreate(void *handle, int tid, char *sqlStr, SSchema *pSchema, int column
if (pContext->pHead) pContext->pHead->prev = pObj;
pContext->pHead = pObj;
if (pContext->dbConn) {
int64_t lastKey = 0;
pObj->pStream = taos_open_stream(pContext->dbConn, pObj->sqlStr, cqProcessStreamRes, lastKey, pObj, NULL);
if (pObj->pStream) {
pContext->num++;
cTrace("vgId:%d, id:%d CQ:%s is openned", pContext->vgId, pObj->tid, pObj->sqlStr);
} else {
cError("vgId:%d, id:%d CQ:%s, failed to launch", pContext->vgId, pObj->tid, pObj->sqlStr);
}
}
cqCreateStream(pContext, pObj);
pthread_mutex_unlock(&pContext->mutex);
@ -218,6 +204,26 @@ void cqDrop(void *handle) {
pthread_mutex_lock(&pContext->mutex);
}
static void cqCreateStream(SCqContext *pContext, SCqObj *pObj) {
if (pContext->dbConn == NULL) {
pContext->dbConn = taos_connect("localhost", pContext->user, pContext->pass, NULL, 0);
if (pContext->dbConn == NULL) {
cError("vgId:%d, failed to connect to TDengine(%s)", pContext->vgId, tstrerror(terrno));
}
return;
}
int64_t lastKey = 0;
pObj->pStream = taos_open_stream(pContext->dbConn, pObj->sqlStr, cqProcessStreamRes, lastKey, pObj, NULL);
if (pObj->pStream) {
pContext->num++;
cTrace("vgId:%d, id:%d CQ:%s is openned", pContext->vgId, pObj->tid, pObj->sqlStr);
} else {
cError("vgId:%d, id:%d CQ:%s, failed to open", pContext->vgId, pObj->tid, pObj->sqlStr);
}
}
static void cqProcessStreamRes(void *param, TAOS_RES *tres, TAOS_ROW row) {
SCqObj *pObj = (SCqObj *)param;
SCqContext *pContext = pObj->pContext;