225c0d55992aefae478461bba278644bdfdda3c5
max
  Wed Jan 15 08:33:57 2014 -0800
library changes for the browser box: This changes mostly hdb and jksql,plus - to a smaller extent - various other places in the code that deal
with /gbdb/ files.  The overall aim is to make it possible to have the
data remote at UCSC while having the CGIs on a machine far away. At up to
180msecs distance from UCSC (Europe,Japan), each query can get slow. So
I tried to reduce the number of queries sent to UCSC while allowing to
keep some mysql tables on localhost.

I changed four things:
- extend larry's table cache to include field names. The code uses
"describe" very often, which is slow from remote. With a table name
cache these queries can be handled locally. This is configured in
hg.conf
- mysql "failover" connections: a mysql connection can have a 2nd
connection that is used if a query fails, configured in hg.conf
(I didn't call it "remote" connections, because we use that term already
in the code)
- mysql lazy connects: don't connect a sqlConnection right away, but
only when needed. a mysql connect takes >500msecs from across the
atlantic.
- move gbdb: patch various places that use absolute "/gbdb/" pathnames
to go through a central function that can change the filename of
gbdb files to something else, as configured in hg.conf

Plus patch 1 or 2 lines for more speed + update the hgMirror script

diff --git src/lib/udc.c src/lib/udc.c
index 4c1746a..0c1e122 100644
--- src/lib/udc.c
+++ src/lib/udc.c
@@ -1640,15 +1640,26 @@
 
 if (startsWith("http://",url) || startsWith("https://",url))
     {
     if (udcInfoViaHttp(url, &info))
 	answer = info.size;
     }
 else if (startsWith("ftp://",url))
     {
     if (udcInfoViaFtp(url, &info))
 	answer = info.size;
     }
 
 return answer;
 }
 #endif
+
+boolean udcIsLocal(char *url) 
+/* return true if file is not a http or ftp file, just a local file */
+{
+// copied from above
+char *protocol = NULL, *afterProtocol = NULL, *colon;
+udcParseUrl(url, &protocol, &afterProtocol, &colon);
+freez(&protocol);
+freez(&afterProtocol);
+return colon==NULL;
+}