feat(core): add tag bias field

src/adapter/driver/driver.c

@@ -1247,6 +1247,28 @@ int neu_adapter_driver_validate_tag(neu_adapter_driver_t *driver,
         return NEU_ERR_TAG_PRECISION_INVALID;
     }
 
+    if (tag->bias != 0) {
+        switch (tag->type) {
+        case NEU_TYPE_INT8:
+        case NEU_TYPE_UINT8:
+        case NEU_TYPE_INT16:
+        case NEU_TYPE_UINT16:
+        case NEU_TYPE_INT32:
+        case NEU_TYPE_UINT32:
+        case NEU_TYPE_INT64:
+        case NEU_TYPE_UINT64:
+        case NEU_TYPE_FLOAT:
+        case NEU_TYPE_DOUBLE:
+            if (tag->bias < -1000 || 1000 < tag->bias ||
+                neu_tag_attribute_test(tag, NEU_ATTRIBUTE_WRITE)) {
+                return NEU_ERR_TAG_BIAS_INVALID;
+            }
+            break;
+        default:
+            return NEU_ERR_TAG_BIAS_INVALID;
+        }
+    }
+
     if (neu_tag_attribute_test(tag, NEU_ATTRIBUTE_SUBSCRIBE) &&
         neu_tag_attribute_test(tag, NEU_ATTRIBUTE_STATIC)) {
         return NEU_ERR_TAG_ATTRIBUTE_NOT_SUPPORT;

src/base/tag.c

@@ -45,6 +45,7 @@ static void tag_array_copy(void *_dst, const void *_src)
     dst->attribute   = src->attribute;
     dst->precision   = src->precision;
     dst->decimal     = src->decimal;
+    dst->bias        = src->bias;
     dst->option      = src->option;
     dst->address     = strdup(src->address);
     dst->name        = strdup(src->name);

src/parser/neu_json_tag.c

@@ -64,6 +64,11 @@ int neu_json_encode_tag(void *json_obj, void *param)
             .t            = NEU_JSON_DOUBLE,
             .v.val_double = tag->decimal,
         },
+        {
+            .name         = "bias",
+            .t            = NEU_JSON_DOUBLE,
+            .v.val_double = tag->bias,
+        },
         {
             .name      = "address",
             .t         = NEU_JSON_STR,
@@ -130,6 +135,11 @@ int neu_json_decode_tag_json(void *json_obj, neu_json_tag_t *tag_p)
             .t         = NEU_JSON_VALUE,
             .attribute = NEU_JSON_ATTRIBUTE_OPTIONAL,
         },
+        {
+            .name      = "bias",
+            .t         = NEU_JSON_DOUBLE,
+            .attribute = NEU_JSON_ATTRIBUTE_OPTIONAL,
+        },
     };
 
     int ret = neu_json_decode_by_json(json_obj, NEU_JSON_ELEM_SIZE(tag_elems),
@@ -146,6 +156,7 @@ int neu_json_decode_tag_json(void *json_obj, neu_json_tag_t *tag_p)
         .description = tag_elems[6].v.val_str,
         .t           = tag_elems[7].t,
         .value       = tag_elems[7].v,
+        .bias        = tag_elems[8].v.val_double,
     };
 
     if (0 != ret) {

src/parser/neu_json_tag.h

@@ -39,6 +39,7 @@ typedef struct {
     int64_t          attribute;
     int64_t          precision;
     double           decimal;
+    double           bias;
     neu_json_type_e  t;
     neu_json_value_u value;
 } neu_json_tag_t;

src/utils/http.c

@@ -321,6 +321,7 @@ int neu_http_response(nng_aio *aio, neu_err_code_e code, char *content)
     case NEU_ERR_TAG_NAME_TOO_LONG:
     case NEU_ERR_TAG_ADDRESS_TOO_LONG:
     case NEU_ERR_TAG_VALUE_INVALID:
+    case NEU_ERR_TAG_BIAS_INVALID:
     case NEU_ERR_GROUP_MAX_GROUPS:
     case NEU_ERR_LICENSE_MAX_TAGS:
     case NEU_ERR_LICENSE_BAD_CLOCK: