Hi everyone,
Possibly a bug or potential improvement in slog.
This will sound excessively complicated, which I recognize and have changed
my approach. Regardless, I see an opportunity to improve surprising
behavior.
I'm looking for feedback on whether I missed something in the slog
documentation or if this is a valid bug or improvement, in which case I can
file it.
slog.Value always json.marshals to an empty document, "{}", which to me was
surprising behavior when using JsonHandler. If a slog.Value is embedded in
a logged non-slog.Value, for example a slice, it will effectively omit
data. On the other hand any tree of Values and Attrs passed directly to
the log functions, without an intervening non-slog.Value object, marshals
and logs properly. I expect a slice, or any other non-slog.Value type,
containing an slog.Value to marshal to json with the slog.Value's
represented value.
Alternatively, the slog documentation (or specifically JsonHandler) could
state that no non-slog.Value object passed to a log method may contain an
slog.Value, and that LogValuers must maintain this invariant.
go1.21.0 darwin/arm64
demonstration <https://goplay.tools/snippet/H26amsQBiYG>
I discovered this when logging (using JsonHandler) an object containing a
list of objects whose logged data I wanted to redact/reduce. I do this as
a LogValuer whose LogValue function constructs and returns a new
slog.GroupValue with a []slog.Value containing the redacted objects for
logging. Each Value is created by in turn calling
Value.Resolve(Value.anyValue(...)) on the component items. The resulting
log contains a list of empty documents. I think this is a reasonable use
of LogValue, though I recognize that many people will suggest not logging
slices.
Thanks,
Steve
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