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3f7c8387c0
In this patch, we add the "+json" log format option that can be set
globally or per log format node.
What it does, it that it sets the LOG_OPT_ENCODE_JSON flag for the
current context which is provided to all lf_* log building function.
This way, all lf_* are now aware of this option and try to comply with
JSON specification when the option is set.
If the option is set globally, then sess_build_logline() will produce a
map-like object with key=val pairs for named logformat nodes.
(logformat nodes that don't have a name are simply ignored).
Example:
log-format "%{+json}o %[int(4)] test %(named_field)[str(ok)]"
Will produce:
{"named_field": "ok"}
If the option isn't set globally, but on a specific node instead, then
only the value will be encoded according to JSON specification.
Example:
log-format "{ \"manual_key\": %(named_field){+json}[bool(true)] }"
Will produce:
{"manual_key": true}
When the option is set, +E option will be ignored, and partial numerical
values (ie: because of logasap) will be encoded as-is.