fix(influx): literal number values in tag set

apps/emqx_bridge_influxdb/src/emqx_bridge_influxdb_connector.erl

@@ -59,6 +59,9 @@
 
 -define(DEFAULT_TIMESTAMP_TMPL, "${timestamp}").
 
+-define(set_tag, set_tag).
+-define(set_field, set_field).
+
 -define(IS_HTTP_ERROR(STATUS_CODE),
     (is_integer(STATUS_CODE) andalso
         (STATUS_CODE < 200 orelse STATUS_CODE >= 300))
@@ -710,8 +713,8 @@ line_to_point(
         precision := Precision
     } = Item
 ) ->
-    {_, EncodedTags} = maps:fold(fun maps_config_to_data/3, {Data, #{}}, Tags),
-    {_, EncodedFields} = maps:fold(fun maps_config_to_data/3, {Data, #{}}, Fields),
+    {_, EncodedTags, _} = maps:fold(fun maps_config_to_data/3, {Data, #{}, ?set_tag}, Tags),
+    {_, EncodedFields, _} = maps:fold(fun maps_config_to_data/3, {Data, #{}, ?set_field}, Fields),
     maps:without([precision], Item#{
         measurement => emqx_placeholder:proc_tmpl(Measurement, Data),
         tags => EncodedTags,
@@ -727,34 +730,43 @@ time_unit(ms) -> millisecond;
 time_unit(us) -> microsecond;
 time_unit(ns) -> nanosecond.
 
-maps_config_to_data(K, V, {Data, Res}) ->
+maps_config_to_data(K, V, {Data, Res, SetType}) ->
     KTransOptions = #{return => rawlist, var_trans => fun key_filter/1},
     VTransOptions = #{return => rawlist, var_trans => fun data_filter/1},
     NK = emqx_placeholder:proc_tmpl(K, Data, KTransOptions),
     NV = proc_quoted(V, Data, VTransOptions),
     case {NK, NV} of
         {[undefined], _} ->
-            {Data, Res};
+            {Data, Res, SetType};
         %% undefined value in normal format [undefined] or int/uint format [undefined, <<"i">>]
         {_, [undefined | _]} ->
-            {Data, Res};
+            {Data, Res, SetType};
         {_, {quoted, [undefined | _]}} ->
-            {Data, Res};
+            {Data, Res, SetType};
         _ ->
-            {Data, Res#{
-                list_to_binary(NK) => value_type(NV, tmpl_type(V))
-            }}
+            NRes = Res#{
+                list_to_binary(NK) => value_type(NV, #{
+                    tmpl_type => tmpl_type(V), set_type => SetType
+                })
+            },
+            {Data, NRes, SetType}
     end.
 
+value_type([Number], #{set_type := ?set_tag}) when is_number(Number) ->
+    %% all `tag` values are treated as string
+    %% See also: https://docs.influxdata.com/influxdb/v2/reference/syntax/line-protocol/#tag-set
+    emqx_utils_conv:bin(Number);
+value_type([Str], #{set_type := ?set_tag}) when is_binary(Str) ->
+    Str;
 value_type({quoted, ValList}, _) ->
     {string_list, ValList};
-value_type([Int, <<"i">>], mixed) when is_integer(Int) ->
+value_type([Int, <<"i">>], #{tmpl_type := mixed}) when is_integer(Int) ->
     {int, Int};
-value_type([UInt, <<"u">>], mixed) when is_integer(UInt) ->
+value_type([UInt, <<"u">>], #{tmpl_type := mixed}) when is_integer(UInt) ->
     {uint, UInt};
 %% write `1`, `1.0`, `-1.0` all as float
 %% see also: https://docs.influxdata.com/influxdb/v2.7/reference/syntax/line-protocol/#float
-value_type([Number], _) when is_number(Number) ->
+value_type([Number], #{set_type := ?set_field}) when is_number(Number) ->
     {float, Number};
 value_type([<<"t">>], _) ->
     't';
@@ -776,9 +788,9 @@ value_type([<<"FALSE">>], _) ->
     'FALSE';
 value_type([<<"False">>], _) ->
     'False';
-value_type([Str], variable) when is_binary(Str) ->
+value_type([Str], #{tmpl_type := variable}) when is_binary(Str) ->
     Str;
-value_type([Str], literal) when is_binary(Str) ->
+value_type([Str], #{tmpl_type := literal, set_type := ?set_field}) when is_binary(Str) ->
     %% if Str is a literal string suffixed with `i` or `u`, we should convert it to int/uint.
     %% otherwise, we should convert it to float.
     NumStr = binary:part(Str, 0, byte_size(Str) - 1),