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

src/client/src/tscParseOpenTSDB.c

@@ -14,6 +14,7 @@
 #include "tscParseLine.h"
 
 #define MAX_FIELDS_NUM 2
+#define JSON_SUB_FIELDS_NUM 2
 #define JSON_FIELDS_NUM 4
 
 #define OTS_TIMESTAMP_COLUMN_NAME "ts"
@@ -429,8 +430,7 @@ int taos_telnet_insert(TAOS* taos, TAOS_SML_DATA_POINT* points, int numPoint) {
 /* telnet style API parser */
 int32_t parseMetricFromJSON(cJSON *root, TAOS_SML_DATA_POINT* pSml, SSmlLinesInfo* info) {
   cJSON *metric = cJSON_GetObjectItem(root, "metric");
-  if (metric == NULL || metric->type != cJSON_String) {
-    tscError("OTD:0x%"PRIx64" failed to parse metric from JSON Payload", info->id);
+  if (cJSON_IsString(metric)) {
     return  TSDB_CODE_TSC_INVALID_JSON;
   }
 
@@ -457,6 +457,55 @@ int32_t parseMetricFromJSON(cJSON *root, TAOS_SML_DATA_POINT* pSml, SSmlLinesInf
 
 }
 
+int32_t parseTimestampFromJSONObj(cJSON *root, int64_t *tsVal, SSmlLinesInfo* info) {
+  int32_t size = cJSON_GetArraySize(root);
+  if (size != JSON_SUB_FIELDS_NUM) {
+    return TSDB_CODE_TSC_INVALID_JSON;
+  }
+
+  cJSON *value = cJSON_GetObjectItem(root, "value");
+  if (!cJSON_IsNumber(value)) {
+    return TSDB_CODE_TSC_INVALID_JSON;
+  }
+
+  cJSON *type = cJSON_GetObjectItem(root, "type");
+  if (!cJSON_IsString(type)) {
+    return TSDB_CODE_TSC_INVALID_JSON;
+  }
+
+  *tsVal = value->valueint;
+  //if timestamp value is 0 use current system time
+  if (*tsVal == 0) {
+    *tsVal = taosGetTimestampNs();
+    return TSDB_CODE_SUCCESS;
+  }
+
+  int32_t typeLen = strlen(type->valuestring);
+  if (typeLen == 1 && type->valuestring[0] == 's') {
+    //seconds
+    *tsVal = *tsVal * 1e9;
+  } else if (typeLen == 2 && type->valuestring[1] == 's') {
+    switch (type->valuestring[0]) {
+      case 'm':
+        //milliseconds
+        *tsVal = convertTimePrecision(*tsVal, TSDB_TIME_PRECISION_MILLI, TSDB_TIME_PRECISION_NANO);
+        break;
+      case 'u':
+        //microseconds
+        *tsVal = convertTimePrecision(*tsVal, TSDB_TIME_PRECISION_MICRO, TSDB_TIME_PRECISION_NANO);
+        break;
+      case 'n':
+        //nanoseconds
+        *tsVal = *tsVal * 1;
+        break;
+      default:
+        return TSDB_CODE_TSC_INVALID_JSON;
+    }
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t parseTimestampFromJSON(cJSON *root, TAOS_SML_KV **pTS, int *num_kvs, SSmlLinesInfo* info) {
   //Timestamp must be the first KV to parse
   assert(*num_kvs == 0);
@@ -464,32 +513,29 @@ int32_t parseTimestampFromJSON(cJSON *root, TAOS_SML_KV **pTS, int *num_kvs, SSm
   char key[] = OTS_TIMESTAMP_COLUMN_NAME;
 
   cJSON *timestamp = cJSON_GetObjectItem(root, "timestamp");
-  if (timestamp == NULL || timestamp->type != cJSON_Number) {
-    tscError("OTD:0x%"PRIx64" failed to parse timestamp from JSON Payload", info->id);
+  if (cJSON_IsNumber(timestamp)) {
+    //timestamp value 0 indicates current system time
+    if (timestamp->valueint == 0) {
+      tsVal = taosGetTimestampNs();
+    } else {
+      tsVal = convertTimePrecision(timestamp->valueint, TSDB_TIME_PRECISION_MICRO, TSDB_TIME_PRECISION_NANO);
+    }
+  } else if (cJSON_IsObject(timestamp)) {
+    parseTimestampFromJSONObj(root, &tsVal, info);
+  } else {
     return TSDB_CODE_TSC_INVALID_JSON;
   }
 
   //allocate fields for timestamp and value
   *pTS = tcalloc(MAX_FIELDS_NUM, sizeof(TAOS_SML_KV));
 
-  tsVal = convertTimePrecision(timestamp->valueint, TSDB_TIME_PRECISION_MICRO, TSDB_TIME_PRECISION_NANO);
 
   (*pTS)->key = tcalloc(sizeof(key), 1);
-  if ((*pTS)->key == NULL) {
-    tfree(*pTS);
-    return TSDB_CODE_TSC_OUT_OF_MEMORY;
-  }
   memcpy((*pTS)->key, key, sizeof(key));
 
   (*pTS)->type = TSDB_DATA_TYPE_TIMESTAMP;
   (*pTS)->length = (int16_t)tDataTypes[(*pTS)->type].bytes;
-
   (*pTS)->value = tcalloc((*pTS)->length, 1);
-  if ((*pTS)->value == NULL) {
-    tfree((*pTS)->key);
-    tfree(*pTS);
-    return TSDB_CODE_TSC_OUT_OF_MEMORY;
-  }
   memcpy((*pTS)->value, &tsVal, (*pTS)->length);
 
   *num_kvs += 1;
@@ -541,7 +587,6 @@ int32_t parseMetricValueFromJSON(cJSON *root, TAOS_SML_KV **pKVs, int *num_kvs,
 
   cJSON *metricVal = cJSON_GetObjectItem(root, "value");
   if (metricVal == NULL) {
-    tscError("OTD:0x%"PRIx64" failed to parse metric value from JSON Payload", info->id);
     return TSDB_CODE_TSC_INVALID_JSON;
   }
 
@@ -566,7 +611,6 @@ int32_t parseTagsFromJSON(cJSON *root, TAOS_SML_KV **pKVs, int *num_kvs, char **
     return TSDB_CODE_TSC_INVALID_JSON;
   }
 
-
   //only pick up the first ID value as child table name
   cJSON *id = cJSON_GetObjectItem(tags, "ID");
   if (id != NULL) {