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e751eebfc6
Currently, the way proxy-oriented logformat directives are handled is way
too complicated. Indeed, "log-format", "log-format-error", "log-format-sd"
and "unique-id-format" all rely on preparsing hints stored inside
proxy->conf member struct. Those preparsing hints include the original
string that should be compiled once the proxy parameters are known plus
the config file and line number where the string was found to generate
precise error messages in case of failure during the compiling process
that happens within check_config_validity().
Now that lf_expr API permits to compile a lf_expr struct that was
previously prepared (with original string and config hints), let's
leverage lf_expr_compile() from check_config_validity() and instead
of relying on individual proxy->conf hints for each logformat expression,
store string and config hints in the lf_expr struct directly and use
lf_expr helpers funcs to handle them when relevant (ie: original
logformat string freeing is now done at a central place inside
lf_expr_deinit(), which allows for some simplifications)
Doing so allows us to greatly simplify the preparsing logic for those 4
proxy directives, and to finally save some space in the proxy struct.
Also, since httpclient proxy has its "logformat" automatically compiled
in check_config_validity(), we now use the file hint from the logformat
expression struct to set an explicit name that will be reported in case
of error ("parsing [httpclient:0] : ...") and remove the extraneous check
in httpclient_precheck() (logformat was parsed twice previously..)
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