iilyak commented on code in PR #4483:
URL: https://github.com/apache/couchdb/pull/4483#discussion_r1143275397
##########
src/couch_log/src/couch_log_formatter.erl:
##########
@@ -436,3 +471,31 @@ get_value(Key, List, Default) ->
supervisor_name({local, Name}) -> Name;
supervisor_name(Name) -> Name.
+
+format_meta(Meta) ->
+ %% https://www.rfc-editor.org/rfc/rfc5424.html#section-6.3
+ %% iut="3" eventSource="Application" eventID="1011"
+ string:join(maps:fold(fun(K, V, Acc) ->
+ [to_str(K, V) | Acc]
+ end, [], Meta), " ").
+
+%% passing complex terms as meta value is a mistake so we are going
+%% to eat it, because we cannot bubble up errors from logger
+%% Therefore following are not supported
+%% - lists
+%% - tuples
+%% - maps
+%% However we are not going to try to distinguish lists from string
+%% Atoms would be printed as strings
+to_str(K, _) when not (is_list(K) or is_atom(K)) ->
+ "";
+to_str(K, Term) when is_list(Term) ->
+ io_lib:format("~s=\"~s\"", [K, Term]);
+to_str(_K, Term) when is_tuple(Term) ->
+ "";
+to_str(_K, Term) when is_map(Term) ->
+ "";
+to_str(K, Term) when is_binary(Term) ->
+ io_lib:format("~s=\"~s\"", [K, Term]);
+to_str(K, Term) ->
Review Comment:
One question I had is whether we should limit precision of floats. I did a
quick experiment to see whether "~p" limits the number of decimal places.
```erlang
6> io_lib:format("~p",
[1.227773345398009300000000000000000000000000000000000000000000000000001]).
["1.2277733453980093"]
```
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