enhance: support resident functions

source/libs/function/src/udfd.c

@@ -29,7 +29,7 @@
 #include "trpc.h"
 // clang-foramt on
 
-SArray* udfdResidentFuncs;
+SArray* udfdResidentFuncs = NULL;
 
 typedef struct SUdfdContext {
   uv_loop_t * loop;
@@ -69,6 +69,7 @@ typedef struct SUdf {
   EUdfState  state;
   uv_mutex_t lock;
   uv_cond_t  condReady;
+  bool resident;
 
   char    name[TSDB_FUNC_NAME_LEN];
   int8_t  funcType;
@@ -202,6 +203,14 @@ void udfdProcessSetupRequest(SUvUdfWork *uvUdf, SUdfRequest *request) {
     if (udf->initFunc) {
       udf->initFunc();
     }
+    udf->resident = false;
+    for (int32_t i = 0; i < taosArrayGetSize(udfdResidentFuncs); ++i) {
+      char* funcName = taosArrayGet(udfdResidentFuncs, i);
+      if (strcmp(setup->udfName, funcName) == 0) {
+        udf->resident = true;
+        break;
+      }
+    }
     udf->state = UDF_STATE_READY;
     uv_cond_broadcast(&udf->condReady);
     uv_mutex_unlock(&udf->lock);
@@ -347,7 +356,7 @@ void udfdProcessTeardownRequest(SUvUdfWork *uvUdf, SUdfRequest *request) {
 
   uv_mutex_lock(&global.udfsMutex);
   udf->refCount--;
-  if (udf->refCount == 0) {
+  if (udf->refCount == 0 && !udf->resident) {
     unloadUdf = true;
     taosHashRemove(global.udfsHash, udf->name, strlen(udf->name));
   }
@@ -944,10 +953,28 @@ void udfdConnectMnodeThreadFunc(void *args) {
 }
 
 int32_t udfdInitResidentFuncs() {
+  udfdResidentFuncs = taosArrayInit(2, TSDB_FUNC_NAME_LEN);
+  char gpd[TSDB_FUNC_NAME_LEN] = "gpd";
+  taosArrayPush(udfdResidentFuncs, gpd);
+  char gpdBatch[TSDB_FUNC_NAME_LEN] = "gpdbatch";
+  taosArrayPush(udfdResidentFuncs, gpdBatch);
   return TSDB_CODE_SUCCESS;
 }
 
 int32_t udfdDeinitResidentFuncs() {
+  for (int32_t i = 0; i < taosArrayGetSize(udfdResidentFuncs); ++i) {
+    char* funcName = taosArrayGet(udfdResidentFuncs, i);
+    SUdf** udfInHash =  taosHashGet(global.udfsHash, funcName, strlen(funcName));
+    if (udfInHash) {
+      taosHashRemove(global.udfsHash, funcName, strlen(funcName));
+      SUdf* udf = *udfInHash;
+      if (udf->destroyFunc) {
+        (udf->destroyFunc)();
+      }
+      uv_dlclose(&udf->lib);
+      taosMemoryFree(udf);
+    }
+  }
   return TSDB_CODE_SUCCESS;
 }
 

source/libs/function/test/udf1.c

@@ -40,10 +40,6 @@ DLL_EXPORT int32_t udf1(SUdfDataBlock* block, SUdfColumn *resultCol) {
       udfColDataSet(resultCol, i, (char *)&luckyNum, false);
     }
   }
-  TAOS* taos = taos_connect("127.0.0.1", "root", "taosdata", "gpd", 6030);
-  taos_query(taos, "create st (ts timestamp, f int) tags(t int)");
-  taos_query(taos, "insert into t using st tags(1) values(now, 1) ");
-  taos_query(taos, "select * from gpd.t");
   //to simulate actual processing delay by udf
 #ifdef LINUX
   usleep(1 * 1000);   // usleep takes sleep time in us (1 millionth of a second)

tests/script/sh/gpd.c

@@ -0,0 +1,77 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#ifdef LINUX
+#include <unistd.h>
+#endif
+#ifdef WINDOWS
+#include <windows.h>
+#endif
+#include "taosudf.h"
+
+
+DLL_EXPORT int32_t gpd_init() {
+  return 0;
+}
+
+DLL_EXPORT int32_t gpd_destroy() {
+  return 0;
+}
+
+DLL_EXPORT int32_t gpd(SUdfDataBlock* block, SUdfColumn *resultCol) {
+  SUdfColumnMeta *meta = &resultCol->colMeta;
+  meta->bytes = 4;
+  meta->type = TSDB_DATA_TYPE_INT;
+  meta->scale = 0;
+  meta->precision = 0;
+
+  SUdfColumnData *resultData = &resultCol->colData;
+  resultData->numOfRows = block->numOfRows;
+  for (int32_t i = 0; i < resultData->numOfRows; ++i) {
+    int j = 0;
+    for (; j < block->numOfCols; ++j) {
+      if (udfColDataIsNull(block->udfCols[j], i)) {
+        udfColDataSetNull(resultCol, i);
+        break;
+      }
+    }
+    if ( j == block->numOfCols) {
+      int32_t luckyNum = 88;
+      udfColDataSet(resultCol, i, (char *)&luckyNum, false);
+    }
+  }
+  taos_init();
+  TAOS* taos = taos_connect("localhost", "root", "taosdata", "", 7100);
+  if (taos == NULL) {
+    char* errstr = "can not connect";
+  }
+  TAOS_RES* res = taos_query(taos, "create database if not exists gpd");
+  if (taos_errno(res) != 0) {
+    char* errstr = taos_errstr(res);
+  } 
+  res = taos_query(taos, "create table gpd.st (ts timestamp, f int) tags(t int)");
+  if (taos_errno(res) != 0) {
+    char* errstr = taos_errstr(res);
+  } 
+
+  taos_query(taos, "insert into gpd.t using gpd.st tags(1) values(now, 1) ");
+  if (taos_errno(res) != 0) {
+    char* errstr = taos_errstr(res);
+  } 
+
+  taos_query(taos, "select * from gpd.t");
+  if (taos_errno(res) != 0) {
+    char* errstr = taos_errstr(res);
+  } 
+
+  taos_close(taos);
+  taos_cleanup();
+  //to simulate actual processing delay by udf
+#ifdef LINUX
+  usleep(1 * 1000);   // usleep takes sleep time in us (1 millionth of a second)
+#endif
+#ifdef WINDOWS
+  Sleep(1);
+#endif
+  return 0;
+}