[TD-6443]<feature>: Support OpenTSDB HTTP JSON data import format

src/client/src/tscParseOpenTSDB.c

@@ -421,3 +421,54 @@ int taos_telnet_insert(TAOS* taos, TAOS_SML_DATA_POINT* points, int numPoint) {
   tfree(info);
   return code;
 }
+
+
+/* telnet style API parser */
+int32_t parseMetricFromJSON(cJSON *root, TAOS_SML_DATA_POINT* pSml, SSmlLinesInfo* info) {
+  int32_t ret = TSDB_CODE_SUCCESS;
+
+  cJSON *metric = cJSON_GetObjectItem(root, "metric");
+  if (metric == NULL || metric->type != cJSON_String) {
+    tscError("OTD:0x%"PRIx64" failed to parse metric from JSON Payload %s", info->id);
+    return  TSDB_CODE_TSC_INVALID_JSON;
+  }
+
+  int32_t stableLen = strlen(metric->valuestring);
+  if (stableLen > TSDB_TABLE_NAME_LEN) {
+      tscError("OTD:0x%"PRIx64" Metric cannot exceeds 193 characters", info->id);
+      return TSDB_CODE_TSC_INVALID_TABLE_ID_LENGTH;
+  }
+
+  pSml->stableName = tcalloc(stableLen + 1, sizeof(char));
+  if (pSml->stableName == NULL){
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+
+  if (isdigit(metric->valuestring[0])) {
+    tscError("OTD:0x%"PRIx64" Metric cannnot start with digit", info->id);
+    tfree(pSml->stableName);
+    return TSDB_CODE_TSC_INVALID_JSON;
+  }
+
+  tstrncpy(pSml->stableName, metric->valuestring, stableLen);
+
+  return TSDB_CODE_SUCCESS;
+
+}
+
+int32_t tscParseJSONPayload(const char* payload, TAOS_SML_DATA_POINT* smlData, SSmlLinesInfo* info) {
+  int32_t ret = TSDB_CODE_SUCCESS;
+
+  if (payload == NULL) {
+    tscError("OTD:0x%"PRIx64" empty JSON Payload %s", info->id);
+    return TSDB_CODE_TSC_INVALID_JSON;
+  }
+
+  cJSON *root = cJSON_Parse(payload);
+  if (root == NULL) {
+    tscError("OTD:0x%"PRIx64" parsing JSON Payload error%s", info->id);
+    return TSDB_CODE_TSC_INVALID_JSON;
+  }
+
+  return ret;
+}

src/inc/taoserror.h

@@ -107,6 +107,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_TSC_INVALID_TAG_LENGTH        TAOS_DEF_ERROR_CODE(0, 0x021E)  //"Invalid tag length")
 #define TSDB_CODE_TSC_INVALID_COLUMN_LENGTH     TAOS_DEF_ERROR_CODE(0, 0x021F)  //"Invalid column length")
 #define TSDB_CODE_TSC_DUP_TAG_NAMES             TAOS_DEF_ERROR_CODE(0, 0x0220)  //"duplicated tag names")
+#define TSDB_CODE_TSC_INVALID_JSON              TAOS_DEF_ERROR_CODE(0, 0x0221)  //"Invalid json format")
 
 // mnode
 #define TSDB_CODE_MND_MSG_NOT_PROCESSED         TAOS_DEF_ERROR_CODE(0, 0x0300)  //"Message not processed")