[TD-6442]<feature>: Support OpenTSDB telnet style data import format

src/client/src/tscParseLineProtocol.c

@@ -2341,10 +2341,138 @@ static int32_t parseTelnetMetricValue(TAOS_SML_KV **pKVs, int *num_kvs, const ch
   return ret;
 }
 
+static int32_t parseTelnetTagKey(TAOS_SML_KV *pKV, const char **index, SHashObj *pHash, SSmlLinesInfo* info) {
+  const char *cur = *index;
+  char key[TSDB_COL_NAME_LEN + 1];  // +1 to avoid key[len] over write
+  uint16_t len = 0;
+
+  //key field cannot start with digit
+  if (isdigit(*cur)) {
+    tscError("SML:0x%"PRIx64" Tag key cannnot start with digit", info->id);
+    return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
+  }
+  while (*cur != '\0') {
+    if (len > TSDB_COL_NAME_LEN) {
+      tscError("SML:0x%"PRIx64" Key field cannot exceeds 65 characters", info->id);
+      return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
+    }
+    if (*cur == '=') {
+      break;
+    }
+
+    key[len] = *cur;
+    cur++;
+    len++;
+  }
+  key[len] = '\0';
+
+  if (checkDuplicateKey(key, pHash, info)) {
+    return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
+  }
+
+  pKV->key = calloc(len + 1, 1);
+  memcpy(pKV->key, key, len + 1);
+  //tscDebug("SML:0x%"PRIx64" Key:%s|len:%d", info->id, pKV->key, len);
+  *index = cur + 1;
+  return TSDB_CODE_SUCCESS;
+}
+
+
+static bool parseTelnetTagValue(TAOS_SML_KV *pKV, const char **index,
+                          bool *is_last_kv, SSmlLinesInfo* info) {
+  const char *start, *cur;
+  char *value = NULL;
+  uint16_t len = 0;
+  start = cur = *index;
+
+  while (1) {
+    // ',' or '\0' identifies a value
+    if (*cur == ',' || *cur == '\0') {
+      // '\0' indicates end of value
+      *is_last_kv = (*cur == '\0') ? true : false;
+      break;
+    }
+    cur++;
+    len++;
+  }
+
+  value = calloc(len + 1, 1);
+  memcpy(value, start, len);
+  value[len] = '\0';
+  if (!convertSmlValueType(pKV, value, len, info)) {
+    tscError("SML:0x%"PRIx64" Failed to convert sml value string(%s) to any type",
+            info->id, value);
+    //free previous alocated key field
+    free(pKV->key);
+    pKV->key = NULL;
+    free(value);
+    return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
+  }
+  free(value);
+
+  return TSDB_CODE_SUCCESS;
+}
+
 static int32_t parseTelnetTagKvs(TAOS_SML_KV **pKVs, int *num_kvs,
-                               const char **index,  TAOS_SML_DATA_POINT* smlData,
+                               const char **index,  char* childTableName,
                                SHashObj *pHash, SSmlLinesInfo* info) {
-  return 0;
+  const char *cur = *index;
+  int32_t ret = TSDB_CODE_SUCCESS;
+  TAOS_SML_KV *pkv;
+  bool is_last_kv = false;
+
+  int32_t capacity = 4;
+  *pKVs = calloc(capacity, sizeof(TAOS_SML_KV));
+  pkv = *pKVs;
+
+  while (*cur != '\0') {
+    ret = parseTelnetTagKey(pkv, &cur, pHash, info);
+    if (ret) {
+      tscError("SML:0x%"PRIx64" Unable to parse key", info->id);
+      return ret;
+    }
+    ret = parseTelnetTagValue(pkv, &cur, &is_last_kv, info);
+    if (ret) {
+      tscError("SML:0x%"PRIx64" Unable to parse value", info->id);
+      return ret;
+    }
+    if ((strcasecmp(pkv->key, "ID") == 0) && pkv->type == TSDB_DATA_TYPE_BINARY) {
+      ret = isValidChildTableName(pkv->value, pkv->length);
+      if (ret) {
+        return ret;
+      }
+      childTableName = malloc(pkv->length + 1);
+      memcpy(childTableName, pkv->value, pkv->length);
+      childTableName[pkv->length] = '\0';
+      free(pkv->key);
+      free(pkv->value);
+    } else {
+      *num_kvs += 1;
+    }
+
+    if (is_last_kv) {
+      break;
+    }
+
+    //reallocate addtional memory for more kvs
+    TAOS_SML_KV *more_kvs = NULL;
+
+    if ((*num_kvs + 1) > capacity) {
+      capacity *= 3; capacity /= 2;
+      more_kvs = realloc(*pKVs, capacity * sizeof(TAOS_SML_KV));
+    } else {
+      more_kvs = *pKVs;
+    }
+
+    if (!more_kvs) {
+      return TSDB_CODE_TSC_OUT_OF_MEMORY;
+    }
+    *pKVs = more_kvs;
+    //move pKV points to next TAOS_SML_KV block
+    pkv = *pKVs + *num_kvs;
+  }
+
+  return ret;
 }
 
 int32_t tscParseTelnetAPI(const char* sql, TAOS_SML_DATA_POINT* smlData, SSmlLinesInfo* info) {
@@ -2373,17 +2501,17 @@ int32_t tscParseTelnetAPI(const char* sql, TAOS_SML_DATA_POINT* smlData, SSmlLin
     tscError("SML:0x%"PRIx64" Unable to parse metric value", info->id);
     return ret;
   }
-  tscDebug("SML:0x%"PRIx64" Parse tags finished, num of tags:%d", info->id, smlData->tagNum);
+  tscDebug("SML:0x%"PRIx64" Parse value finished", info->id);
 
   //Parse tagKVs
   SHashObj *keyHashTable = taosHashInit(128, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, false);
-  ret = parseTelnetTagKvs(&smlData->fields, &smlData->fieldNum, &index, smlData, keyHashTable, info);
+  ret = parseTelnetTagKvs(&smlData->fields, &smlData->fieldNum, &index, smlData->childTableName, keyHashTable, info);
   if (ret) {
-    tscError("SML:0x%"PRIx64" Unable to parse field", info->id);
+    tscError("SML:0x%"PRIx64" Unable to parse tags", info->id);
     taosHashCleanup(keyHashTable);
     return ret;
   }
-  tscDebug("SML:0x%"PRIx64" Parse fields finished, num of fields:%d", info->id, smlData->fieldNum);
+  tscDebug("SML:0x%"PRIx64" Parse tags finished", info->id);
   taosHashCleanup(keyHashTable);