[squid-dev] How Squid parse the configuration file?

[周书林]

Thank you very much.
And one more question, is there any checking mechanism for validity of
config value?
For example, if config option "maximum_object_size_in_memory" is set as
10000, how to check if this value is valid?

2017-02-22 0:52 GMT+08:00 Alex Rousskov <rousskov at measurement-factory.com>:

> On 02/21/2017 01:15 AM, 周书林 wrote:
> > I found the src/cf.data.pre file, and read the content. But I still want
> > to know how squid use this file to build the connection between the
> > config file and the source code.
>
> As you already know, the parser is generated. The generated code either
> places parsed values directly into the global Config object or calls
> some helper functions that update the global state. (Updating global
> state during parsing is very wrong but that is a different story.)
>
> If you want to see the actual generated parsing code for a given
> squid.conf directive, just grep for it! For example,
>
>   $ fgrep -A5 -RI maximum_object_size_in_memory src
>
> will point you to the following code in src/cf_parser.cci:
>
> > src/cf_parser.cci:    if (!strcmp(token, "maximum_object_size_in_memory"))
> {
> > src/cf_parser.cci:        cfg_directive = "maximum_object_size_in_
> memory";
> > src/cf_parser.cci-        parse_b_size_t(&Config.Store.maxInMemObjSize);
> > src/cf_parser.cci-        cfg_directive = NULL;
> > src/cf_parser.cci-        return 1;
>
>
> How was that code generated? Search for "cfg_directive = NULL" to find
> the parser generator code in the repository:
>
>   $ bzr grep 'cfg_directive = NULL'
>
> > src/cf_gen.cc:    fout << "        cfg_directive = NULL;" << std::endl;
>
> which will point you to the Entry::genParseAlias() method.
>
>
> HTH,
>
> Alex.
>
>
>
> > 2017-01-13 22:14 GMT+08:00 Stuart Henderson:
> >
> >     On 2017-01-13, 周书林 <zhoushulin1992 at gmail.com
> >     <mailto:zhoushulin1992 at gmail.com>> wrote:
> >     > Why some of the configuration directives in official website
> cannot find in
> >     > the source code? Some could find a relevant program variable in
> Class
> >     > SquidConfig, while majority of the configuration directives cannot
> be found
> >     > in the source code, for example , directive "announce_port".
> >     > So how does Squid parse the configuration file of Users, and use
> them in
> >     > the source code?
> >
> >     The parser, sample config, etc, are all generated from
> src/cf.data.pre.
> >
> >
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> >
> >
> >
> >
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> >
>
>
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