[TD-3275]<feature>: [mnode] create, drop, show funcs

src/inc/taosdef.h

@@ -184,6 +184,7 @@ do { \
 #define TSDB_TABLE_NAME_LEN       193     // it is a null-terminated string
 #define TSDB_DB_NAME_LEN          33
 #define TSDB_FUNC_NAME_LEN        128
+#define TSDB_FUNC_CODE_LEN        (4096 - 512)
 #define TSDB_TABLE_FNAME_LEN      (TSDB_ACCT_ID_LEN + TSDB_DB_NAME_LEN + TSDB_TABLE_NAME_LEN)
 #define TSDB_COL_NAME_LEN         65
 #define TSDB_MAX_SAVED_SQL_LEN    TSDB_MAX_COLUMNS * 64

src/inc/taoserror.h

@@ -173,6 +173,12 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_MND_INVALID_STABLE_NAME       TAOS_DEF_ERROR_CODE(0, 0x036D)  //"Super table does not exist")
 #define TSDB_CODE_MND_INVALID_CREATE_TABLE_MSG  TAOS_DEF_ERROR_CODE(0, 0x036E)  //"Invalid create table message")
 
+#define TSDB_CODE_MND_INVALID_FUNC_NAME         TAOS_DEF_ERROR_CODE(0, 0x0370)  //"Invalid func name")
+#define TSDB_CODE_MND_INVALID_FUNC_LEN          TAOS_DEF_ERROR_CODE(0, 0x0371)  //"Invalid func length")
+#define TSDB_CODE_MND_INVALID_FUNC_CODE         TAOS_DEF_ERROR_CODE(0, 0x0372)  //"Invalid func code")
+#define TSDB_CODE_MND_FUNC_ALREADY_EXIST        TAOS_DEF_ERROR_CODE(0, 0x0373)  //"Func already exists")
+#define TSDB_CODE_MND_INVALID_FUNC              TAOS_DEF_ERROR_CODE(0, 0x0351)  //"Invalid func")
+
 #define TSDB_CODE_MND_DB_NOT_SELECTED           TAOS_DEF_ERROR_CODE(0, 0x0380)  //"Database not specified or available")
 #define TSDB_CODE_MND_DB_ALREADY_EXIST          TAOS_DEF_ERROR_CODE(0, 0x0381)  //"Database already exists")
 #define TSDB_CODE_MND_INVALID_DB_OPTION         TAOS_DEF_ERROR_CODE(0, 0x0382)  //"Invalid database options")

src/mnode/inc/mnodeDef.h

@@ -214,6 +214,17 @@ typedef struct SUserObj {
   struct SAcctObj * pAcct;
 } SUserObj;
 
+typedef struct SFuncObj {
+  char              name[TSDB_FUNC_NAME_LEN];
+  char              path[PATH_MAX];
+  int32_t           codeLen;
+  char              code[TSDB_FUNC_CODE_LEN];
+  int64_t           createdTime;
+  int8_t            reserved[64];
+  int8_t            updateEnd[4];
+  int32_t           refCount;
+} SFuncObj;
+
 typedef struct {
   int64_t totalStorage;  // Total storage wrtten from this account
   int64_t compStorage;   // Compressed storage on disk

src/mnode/inc/mnodeFunc.h

+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TDENGINE_MNODE_FUNC_H
+#define TDENGINE_MNODE_FUNC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include "mnodeDef.h"
+
+int32_t   mnodeInitFuncs();
+void      mnodeCleanupFuncs();
+
+SFuncObj *mnodeGetFunc(char *name);
+void *    mnodeGetNextFunc(void *pIter, SFuncObj **pFunc);
+void      mnodeCancelGetNextFunc(void *pIter);
+
+void      mnodeIncFuncRef(SFuncObj *pFunc);
+void      mnodeDecFuncRef(SFuncObj *pFunc);
+
+int32_t   mnodeCreateFunc(SAcctObj *pAcct, char *name, int32_t codeLen, char *code, char *path, SMnodeMsg *pMsg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/mnode/inc/mnodeSdb.h

@@ -33,7 +33,8 @@ typedef enum {
   SDB_TABLE_VGROUP  = 6,
   SDB_TABLE_STABLE  = 7,
   SDB_TABLE_CTABLE  = 8,
-  SDB_TABLE_MAX     = 9
+  SDB_TABLE_FUNC    = 9,
+  SDB_TABLE_MAX     = 10
 } ESdbTable;
 
 typedef enum {
@@ -110,4 +111,4 @@ bool     sdbCheckRowDeleted(void *pTable, void *pRow);
 }
 #endif
 
-#endif
+#endif
\ No newline at end of file

src/mnode/src/mnodeDb.c

@@ -44,17 +44,12 @@ void *  tsDbSdb = NULL;
 static int32_t tsDbUpdateSize;
 
 static int32_t mnodeCreateDb(SAcctObj *pAcct, SCreateDbMsg *pCreate, SMnodeMsg *pMsg);
-static int32_t mnodeCreateFunc(SAcctObj *pAcct, SCreateFuncMsg *pCreate, SMnodeMsg *pMsg);
 static int32_t mnodeDropDb(SMnodeMsg *newMsg);
 static int32_t mnodeSetDbDropping(SDbObj *pDb);
 static int32_t mnodeGetDbMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn);
-static int32_t mnodeGetFuncMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn);
 static int32_t mnodeRetrieveDbs(SShowObj *pShow, char *data, int32_t rows, void *pConn);
-static int32_t mnodeRetrieveFuncs(SShowObj *pShow, char *data, int32_t rows, void *pConn);
 static int32_t mnodeProcessCreateDbMsg(SMnodeMsg *pMsg);
-static int32_t mnodeProcessCreateFuncMsg(SMnodeMsg *pMsg);
 static int32_t mnodeProcessDropDbMsg(SMnodeMsg *pMsg);
-static int32_t mnodeProcessDropFuncMsg(SMnodeMsg *pMsg);
 
 int32_t mnodeProcessAlterDbMsg(SMnodeMsg *pMsg);
 
@@ -182,14 +177,10 @@ int32_t mnodeInitDbs() {
   }
 
   mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_CREATE_DB, mnodeProcessCreateDbMsg);
-  mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_CREATE_FUNCTION, mnodeProcessCreateFuncMsg);
   mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_ALTER_DB, mnodeProcessAlterDbMsg);
   mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_DROP_DB, mnodeProcessDropDbMsg);
-  mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_DROP_FUNCTION, mnodeProcessDropFuncMsg);
   mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_DB, mnodeGetDbMeta);
-  mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_FUNCTION, mnodeGetFuncMeta);
   mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_DB, mnodeRetrieveDbs);
-  mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_FUNCTION, mnodeRetrieveFuncs);
   mnodeAddShowFreeIterHandle(TSDB_MGMT_TABLE_DB, mnodeCancelGetNextDb);
   
   mDebug("table:dbs table is created");
@@ -473,17 +464,6 @@ static int32_t mnodeCreateDb(SAcctObj *pAcct, SCreateDbMsg *pCreate, SMnodeMsg *
   return code;
 }
 
-static int32_t mnodeCreateFunc(SAcctObj *pAcct, SCreateFuncMsg *pCreate, SMnodeMsg *pMsg) {
-  int32_t code = acctCheck(pAcct, ACCT_GRANT_DB);
-  if (code != 0) return code;
-
-  mError("Function name:%s, path:%s, code:%.*s", pCreate->name, pCreate->path, pCreate->codeLen, pCreate->code);
-
-  return code;
-}
-
-
-
 bool mnodeCheckIsMonitorDB(char *db, char *monitordb) {
   char dbName[TSDB_DB_NAME_LEN] = {0};
   extractDBName(db, dbName);
@@ -707,41 +687,6 @@ static int32_t mnodeGetDbMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn
   return 0;
 }
 
-static int32_t mnodeGetFuncMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn) {
-  int32_t cols = 0;
-
-  SSchema *pSchema = pMeta->schema;
-
-  pShow->bytes[cols] = (TSDB_FUNC_NAME_LEN - 1) + VARSTR_HEADER_SIZE;
-  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
-  strcpy(pSchema[cols].name, "name");
-  pSchema[cols].bytes = htons(pShow->bytes[cols]);
-  cols++;
-
-  pShow->bytes[cols] = PATH_MAX + VARSTR_HEADER_SIZE;
-  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
-  strcpy(pSchema[cols].name, "path");
-  pSchema[cols].bytes = htons(pShow->bytes[cols]);
-  cols++;
-
-  pMeta->numOfColumns = htons(cols);
-  pShow->numOfColumns = cols;
-
-  pShow->offset[0] = 0;
-  for (int32_t i = 1; i < cols; ++i) {
-    pShow->offset[i] = pShow->offset[i - 1] + pShow->bytes[i - 1];
-  }
-
-  pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-
-  //TODO GET ROWS NUM
-  
-  pShow->numOfRows = 1;
-
-  return 0;
-}
-
-
 char *mnodeGetDbStr(char *src) {
   char *pos = strstr(src, TS_PATH_DELIMITER);
   if (pos != NULL) ++pos;
@@ -889,36 +834,6 @@ static int32_t mnodeRetrieveDbs(SShowObj *pShow, char *data, int32_t rows, void
   return numOfRows;
 }
 
-
-static int32_t mnodeRetrieveFuncs(SShowObj *pShow, char *data, int32_t rows, void *pConn) {
-  int32_t numOfRows = 0;
-  char *  pWrite;
-  int32_t cols = 0;
-
-  while (numOfRows < rows) {
-    cols = 0;
-
-    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;  
-
-    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, "aaa", pShow->bytes[cols]);
-
-    cols++;
-
-    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
-    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, "/tmp/abc", pShow->bytes[cols]);
-    cols++;
-
-    numOfRows++;
-  }
-
-  pShow->numOfReads += numOfRows;
-  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
-
-  return numOfRows;
-}
-
-
-
 void mnodeAddSuperTableIntoDb(SDbObj *pDb) {
   atomic_add_fetch_32(&pDb->numOfSuperTables, 1);
 }
@@ -980,23 +895,6 @@ static int32_t mnodeProcessCreateDbMsg(SMnodeMsg *pMsg) {
   return code;
 }
 
-static int32_t mnodeProcessCreateFuncMsg(SMnodeMsg *pMsg) {
-  SCreateFuncMsg *pCreate    = pMsg->rpcMsg.pCont;  
-  pCreate->codeLen       = htonl(pCreate->codeLen);
-  
-  int32_t code;
-  if (grantCheck(TSDB_GRANT_TIME) != TSDB_CODE_SUCCESS) {
-    code = TSDB_CODE_GRANT_EXPIRED;
-  } else if (!pMsg->pUser->writeAuth) {
-    code = TSDB_CODE_MND_NO_RIGHTS;
-  } else {
-    code = mnodeCreateFunc(pMsg->pUser->pAcct, pCreate, pMsg);
-  }
-
-  return code;
-}
-
-
 static SDbCfg mnodeGetAlterDbOption(SDbObj *pDb, SAlterDbMsg *pAlter) {
   SDbCfg  newCfg = pDb->cfg;
   int32_t maxTables      = htonl(pAlter->maxTables);
@@ -1290,15 +1188,6 @@ static int32_t mnodeProcessDropDbMsg(SMnodeMsg *pMsg) {
   return mnodeDropDb(pMsg);
 }
 
-static int32_t mnodeProcessDropFuncMsg(SMnodeMsg *pMsg) {
-  SDropFuncMsg *pDrop = pMsg->rpcMsg.pCont;
-
-  mError("drop function:%s", pDrop->name);
-
-  return TSDB_CODE_SUCCESS;
-}
-
-
 void  mnodeDropAllDbs(SAcctObj *pAcct)  {
   int32_t numOfDbs = 0;
   SDbObj *pDb = NULL;

src/mnode/src/mnodeFunc.c

+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _DEFAULT_SOURCE
+#include "os.h"
+#include "trpc.h"
+#include "tutil.h"
+#include "tglobal.h"
+#include "tgrant.h"
+#include "tdataformat.h"
+#include "tkey.h"
+#include "mnode.h"
+#include "dnode.h"
+#include "mnodeDef.h"
+#include "mnodeInt.h"
+#include "mnodeAcct.h"
+#include "mnodeUser.h"
+#include "mnodeMnode.h"
+#include "mnodeSdb.h"
+#include "mnodeShow.h"
+#include "mnodeFunc.h"
+#include "mnodeWrite.h"
+#include "mnodePeer.h"
+
+int64_t        tsFuncRid = -1;
+static void *  tsFuncSdb = NULL;
+static int32_t tsFuncUpdateSize = 0;
+static int32_t mnodeGetFuncMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn);
+static int32_t mnodeRetrieveFuncs(SShowObj *pShow, char *data, int32_t rows, void *pConn);
+static int32_t mnodeProcessCreateFuncMsg(SMnodeMsg *pMsg);
+static int32_t mnodeProcessDropFuncMsg(SMnodeMsg *pMsg);
+
+static int32_t mnodeFuncActionDestroy(SSdbRow *pRow) {
+  tfree(pRow->pObj);
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t mnodeFuncActionInsert(SSdbRow *pRow) {
+  SFuncObj *pFunc = pRow->pObj;
+
+  mTrace("func:%s, length: %d, insert into sdb", pFunc->name, pFunc->codeLen);
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t mnodeFuncActionDelete(SSdbRow *pRow) {
+  SFuncObj *pFunc = pRow->pObj;
+
+  mTrace("func:%s, length: %d, delete from sdb", pFunc->name, pFunc->codeLen);
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t mnodeFuncActionUpdate(SSdbRow *pRow) {
+  SFuncObj *pFunc = pRow->pObj;
+
+  SFuncObj *pSaved = mnodeGetFunc(pFunc->name);
+  if (pFunc != pSaved) {
+    memcpy(pSaved, pFunc, tsFuncUpdateSize);
+    free(pFunc);
+  }
+  mnodeDecFuncRef(pSaved);
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t mnodeFuncActionEncode(SSdbRow *pRow) {
+  SFuncObj *pFunc = pRow->pObj;
+
+  memcpy(pRow->rowData, pFunc, tsFuncUpdateSize);
+  pRow->rowSize = tsFuncUpdateSize;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t mnodeFuncActionDecode(SSdbRow *pRow) {
+  SFuncObj *pFunc = (SFuncObj *)calloc(1, sizeof(SFuncObj));
+  if (pFunc == NULL) return TSDB_CODE_MND_OUT_OF_MEMORY;
+
+  memcpy(pFunc, pRow->rowData, tsFuncUpdateSize);
+  pRow->pObj = pFunc;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t mnodeFuncActionRestored() {
+  int64_t numOfRows = sdbGetNumOfRows(tsFuncSdb);
+
+  if (numOfRows <= 0 && dnodeIsFirstDeploy()) {
+    mInfo("dnode first deploy, func restored.");
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t mnodeInitFuncs() {
+  SFuncObj tObj;
+  tsFuncUpdateSize = (int32_t)((int8_t *)tObj.updateEnd - (int8_t *)&tObj);
+
+  SSdbTableDesc desc = {
+    .id           = SDB_TABLE_FUNC,
+    .name         = "funcs",
+    .hashSessions = TSDB_DEFAULT_USERS_HASH_SIZE,
+    .maxRowSize   = tsFuncUpdateSize,
+    .refCountPos  = (int32_t)((int8_t *)(&tObj.refCount) - (int8_t *)&tObj),
+    .keyType      = SDB_KEY_STRING,
+    .fpInsert     = mnodeFuncActionInsert,
+    .fpDelete     = mnodeFuncActionDelete,
+    .fpUpdate     = mnodeFuncActionUpdate,
+    .fpEncode     = mnodeFuncActionEncode,
+    .fpDecode     = mnodeFuncActionDecode,
+    .fpDestroy    = mnodeFuncActionDestroy,
+    .fpRestored   = mnodeFuncActionRestored
+  };
+
+  tsFuncRid = sdbOpenTable(&desc);
+  tsFuncSdb = sdbGetTableByRid(tsFuncRid);
+  if (tsFuncSdb == NULL) {
+    mError("table:%s, failed to create hash", desc.name);
+    return -1;
+  }
+
+  mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_CREATE_FUNCTION, mnodeProcessCreateFuncMsg);
+  mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_DROP_FUNCTION, mnodeProcessDropFuncMsg);
+  mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_FUNCTION, mnodeGetFuncMeta);
+  mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_FUNCTION, mnodeRetrieveFuncs);
+  mnodeAddShowFreeIterHandle(TSDB_MGMT_TABLE_FUNCTION, mnodeCancelGetNextFunc);
+
+  mDebug("table:%s, hash is created", desc.name);
+
+  return 0;
+}
+
+void mnodeCleanupFuncs() {
+  sdbCloseTable(tsFuncRid);
+  tsFuncSdb = NULL;
+}
+
+SFuncObj *mnodeGetFunc(char *name) {
+  return (SFuncObj *)sdbGetRow(tsFuncSdb, name);
+}
+
+void *mnodeGetNextFunc(void *pIter, SFuncObj **pFunc) {
+  return sdbFetchRow(tsFuncSdb, pIter, (void **)pFunc);
+}
+
+void mnodeCancelGetNextFunc(void *pIter) {
+ sdbFreeIter(tsFuncSdb, pIter);
+}
+
+void mnodeIncFuncRef(SFuncObj *pFunc) {
+  sdbIncRef(tsFuncSdb, pFunc);
+}
+
+void mnodeDecFuncRef(SFuncObj *pFunc) {
+  sdbDecRef(tsFuncSdb, pFunc);
+}
+/*
+static int32_t mnodeUpdateFunc(SFuncObj *pFunc, void *pMsg) {
+  SSdbRow row = {
+    .type   = SDB_OPER_GLOBAL,
+    .pTable = tsFuncSdb,
+    .pObj   = pFunc,
+    .pMsg   = pMsg
+  };
+
+  int32_t code = sdbUpdateRow(&row);
+  if (code != TSDB_CODE_SUCCESS && code != TSDB_CODE_MND_ACTION_IN_PROGRESS) {
+    mError("func:%s, failed to alter by %s, reason:%s", pFunc->name, mnodeGetUserFromMsg(pMsg), tstrerror(code));
+  } else {
+    mLInfo("func:%s, is altered by %s", pFunc->name, mnodeGetUserFromMsg(pMsg));
+  }
+
+  return code;
+}
+*/
+int32_t mnodeCreateFunc(SAcctObj *pAcct, char *name, int32_t codeLen, char *codeScript, char *path, SMnodeMsg *pMsg) {
+  if (grantCheck(TSDB_GRANT_TIME) != TSDB_CODE_SUCCESS) {
+    return TSDB_CODE_GRANT_EXPIRED;
+  }
+
+  if (!pMsg->pUser->writeAuth) {
+    return TSDB_CODE_MND_NO_RIGHTS;
+  }
+
+  int32_t code = acctCheck(pAcct, ACCT_GRANT_USER);
+  if (code != TSDB_CODE_SUCCESS) {
+    return code;
+  }
+
+  code = grantCheck(TSDB_GRANT_USER);
+  if (code != TSDB_CODE_SUCCESS) {
+    return code;
+  }
+
+  if (name[0] == 0) {
+    return TSDB_CODE_MND_INVALID_FUNC_NAME;
+  }
+
+  if (codeScript[0] == 0) {
+    return TSDB_CODE_MND_INVALID_FUNC_CODE;
+  }
+
+  if (codeLen < 0 || codeLen > TSDB_FUNC_CODE_LEN - 1) {
+    return TSDB_CODE_MND_INVALID_FUNC_LEN;
+  }
+
+  SFuncObj *pFunc = mnodeGetFunc(name);
+  if (pFunc != NULL) {
+    mDebug("func:%s, is already there", name);
+    mnodeDecFuncRef(pFunc);
+    return TSDB_CODE_MND_FUNC_ALREADY_EXIST;
+  }
+
+  pFunc = calloc(1, sizeof(SFuncObj));
+  tstrncpy(pFunc->name, name, TSDB_FUNC_NAME_LEN);
+  tstrncpy(pFunc->path, path, PATH_MAX);
+  tstrncpy(pFunc->code, codeScript, TSDB_FUNC_CODE_LEN);
+  pFunc->codeLen = codeLen;
+  pFunc->createdTime = taosGetTimestampMs();
+
+  SSdbRow row = {
+    .type     = SDB_OPER_GLOBAL,
+    .pTable   = tsFuncSdb,
+    .pObj     = pFunc,
+    .rowSize  = sizeof(SFuncObj),
+    .pMsg     = pMsg
+  };
+
+  code = sdbInsertRow(&row);
+  if (code != TSDB_CODE_SUCCESS && code != TSDB_CODE_MND_ACTION_IN_PROGRESS) {
+    mError("func:%s, failed to create by %s, reason:%s", pFunc->name, mnodeGetUserFromMsg(pMsg), tstrerror(code));
+    tfree(pFunc);
+  } else {
+    mLInfo("func:%s, is created by %s", pFunc->name, mnodeGetUserFromMsg(pMsg));
+  }
+
+  return code;
+}
+
+static int32_t mnodeDropFunc(SFuncObj *pFunc, void *pMsg) {
+  SSdbRow row = {
+    .type   = SDB_OPER_GLOBAL,
+    .pTable = tsFuncSdb,
+    .pObj   = pFunc,
+    .pMsg   = pMsg
+  };
+
+  int32_t code = sdbDeleteRow(&row);
+  if (code != TSDB_CODE_SUCCESS && code != TSDB_CODE_MND_ACTION_IN_PROGRESS) {
+    mError("func:%s, failed to drop by %s, reason:%s", pFunc->name, mnodeGetUserFromMsg(pMsg), tstrerror(code));
+  } else {
+    mLInfo("func:%s, is dropped by %s", pFunc->name, mnodeGetUserFromMsg(pMsg));
+  }
+
+  return code;
+}
+
+static int32_t mnodeGetFuncsNum() {
+  return (int32_t)sdbGetNumOfRows(tsFuncSdb);
+}
+
+static int32_t mnodeGetFuncMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn) {
+  SUserObj *pUser = mnodeGetUserFromConn(pConn);
+  if (pUser == NULL) {
+    return TSDB_CODE_MND_NO_USER_FROM_CONN;
+  }
+
+  int32_t cols = 0;
+  SSchema *pSchema = pMeta->schema;
+
+  pShow->bytes[cols] = TSDB_FUNC_NAME_LEN + VARSTR_HEADER_SIZE;
+  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema[cols].name, "name");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = PATH_MAX + VARSTR_HEADER_SIZE;
+  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema[cols].name, "path");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 8;
+  pSchema[cols].type = TSDB_DATA_TYPE_TIMESTAMP;
+  strcpy(pSchema[cols].name, "create_time");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "code_len");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = TSDB_FUNC_CODE_LEN + VARSTR_HEADER_SIZE;
+  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema[cols].name, "code");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pMeta->numOfColumns = htons(cols);
+  strcpy(pMeta->tableFname, "show funcs");
+  pShow->numOfColumns = cols;
+
+  pShow->offset[0] = 0;
+  for (int32_t i = 1; i < cols; ++i) {
+    pShow->offset[i] = pShow->offset[i - 1] + pShow->bytes[i - 1];
+  }
+
+  pShow->numOfRows = mnodeGetFuncsNum();
+  pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
+
+  mnodeDecUserRef(pUser);
+
+  return 0;
+}
+
+static int32_t mnodeRetrieveFuncs(SShowObj *pShow, char *data, int32_t rows, void *pConn) {
+  int32_t   numOfRows = 0;
+  SFuncObj *pFunc    = NULL;
+  int32_t   cols      = 0;
+  char     *pWrite;
+
+  while (numOfRows < rows) {
+    pShow->pIter = mnodeGetNextFunc(pShow->pIter, &pFunc);
+    if (pFunc == NULL) break;
+
+    cols = 0;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pFunc->name, pShow->bytes[cols]);
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pFunc->path, pShow->bytes[cols]);
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int64_t *)pWrite = pFunc->createdTime;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t *)pWrite = pFunc->codeLen;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pFunc->code, pShow->bytes[cols]);
+    cols++;
+
+    numOfRows++;
+    mnodeDecFuncRef(pFunc);
+  }
+
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
+  pShow->numOfReads += numOfRows;
+  return numOfRows;
+}
+
+static int32_t mnodeProcessCreateFuncMsg(SMnodeMsg *pMsg) {
+  SCreateFuncMsg *pCreate    = pMsg->rpcMsg.pCont;
+  pCreate->codeLen       = htonl(pCreate->codeLen);
+
+  return mnodeCreateFunc(pMsg->pUser->pAcct, pCreate->name, pCreate->codeLen, pCreate->code, pCreate->path, pMsg);
+}
+
+static int32_t mnodeProcessDropFuncMsg(SMnodeMsg *pMsg) {
+  SDropFuncMsg *pDrop = pMsg->rpcMsg.pCont;
+
+  SFuncObj *pFunc = mnodeGetFunc(pDrop->name);
+  if (pFunc == NULL) {
+    return TSDB_CODE_MND_INVALID_FUNC;
+  }
+
+  return mnodeDropFunc(pFunc, pMsg);
+}

src/mnode/src/mnodeMain.c

@@ -32,6 +32,7 @@
 #include "mnodeSdb.h"
 #include "mnodeVgroup.h"
 #include "mnodeUser.h"
+#include "mnodeFunc.h"
 #include "mnodeTable.h"
 #include "mnodeCluster.h"
 #include "mnodeShow.h"
@@ -46,6 +47,7 @@ static SStep tsMnodeSteps[] = {
   {"cluster", mnodeInitCluster, mnodeCleanupCluster},
   {"accts",   mnodeInitAccts,   mnodeCleanupAccts},
   {"users",   mnodeInitUsers,   mnodeCleanupUsers},
+  {"funcs",   mnodeInitFuncs,   mnodeCleanupFuncs},
   {"dnodes",  mnodeInitDnodes,  mnodeCleanupDnodes},
   {"dbs",     mnodeInitDbs,     mnodeCleanupDbs},
   {"vgroups", mnodeInitVgroups, mnodeCleanupVgroups},

src/util/src/terror.c

@@ -185,6 +185,12 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_FIELD_NOT_EXIST,          "Field does not exist"
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_STABLE_NAME,      "Super table does not exist")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_CREATE_TABLE_MSG, "Invalid create table message")
 
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_FUNC_NAME,        "Invalid func name")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_FUNC_LEN,         "Invalid func length")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_FUNC_CODE,        "Invalid func code")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_FUNC_ALREADY_EXIST,       "Func already exists")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_FUNC,             "Invalid func")
+
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_DB_NOT_SELECTED,          "Database not specified or available")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_DB_ALREADY_EXIST,         "Database already exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_DB_OPTION,        "Invalid database options")