[PATCH] squid: Add RAM-only Proxy functionality

["Daniel Weismüller" <daniel.weismueller@ipfire.org>]

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As suggested by Oliver "giller" Fieker <oli(a)new-lan.de>
in bug 10592 I added the functionality to use the squid as ram-only cache.

Further it defines the maximum_object_size_in_memory
as 2% of the in the webif defined "Memory cache size".
The maximum_object_size_in_memory should have a useful
size of the defined memory cache and I don't want to
create another variable which muste be fulled in by the user.

Signed-off-by: Daniel Weismüller <daniel.weismueller(a)ipfire.org>
Suggested-by: Oliver "giller" Fieker <oli(a)new-lan.de>
Suggested-by: Kim Wölfel <xaver4all(a)gmx.de>
Acked-by: Michael Tremer <michael.tremer(a)ipfire.org>
Cc: Stefan Schantl <stefan.schantl(a)ipfire.org>
Signed-off-by: Daniel Weismüller <daniel.weismueller(a)ipfire.org>
---
 html/cgi-bin/proxy.cgi | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/html/cgi-bin/proxy.cgi b/html/cgi-bin/proxy.cgi
index 6aa14e15a..8379cf86d 100644
--- a/html/cgi-bin/proxy.cgi
+++ b/html/cgi-bin/proxy.cgi
@@ -401,8 +401,7 @@ if (($proxysettings{'ACTION'} eq $Lang::tr{'save'}) || ($proxysettings{'ACTION'}
 		$errormessage = $Lang::tr{'proxy errmsg filedescriptors'};
 		goto ERROR;
 	}
-	if (!($proxysettings{'CACHE_MEM'} =~ /^\d+/) ||
-		($proxysettings{'CACHE_MEM'} < 1))
+	if (!($proxysettings{'CACHE_MEM'} =~ /^\d+/))
 	{
 		$errormessage = $Lang::tr{'advproxy errmsg mem cache size'};
 		goto ERROR;
@@ -3174,7 +3173,7 @@ END
 		}
 	}
 
-	if ($proxysettings{'CACHE_SIZE'} > 0)
+	if (($proxysettings{'CACHE_SIZE'} > 0) || ($proxysettings{'CACHE_MEM'} > 0))
 	{
 		print FILE "\n";
 
@@ -3271,7 +3270,12 @@ cache_dir aufs /var/log/cache $proxysettings{'CACHE_SIZE'} $proxysettings{'L1_DI
 END
 		;
 	} else {
-		print FILE "cache deny all\n\n";
+		if ($proxysettings{'CACHE_MEM'} > 0) {
+			# always 2% of CACHE_MEM defined as max object size
+			print FILE "maximum_object_size_in_memory " . int($proxysettings{'CACHE_MEM'} * 1024 * 0.02) . " KB\n\n";
+		} else {
+			print FILE "cache deny all\n\n";
+	    }
 	}
 
 	print FILE <<END
-- 
2.14.3