On 13/11/2016 12:50 p.m., Stefan Wickstrom wrote: > Hello all, > Apologies for the possibly incorrect format/posting of this query; I am new > to this mode of discussion in relation to software. > > I am attempting to use Squid, in combination with storeID rewrite, to > redirect Steam CDN requests allowing multiple CDN requests to be served > from the single Squid cache entry. Well, firstly. Store-ID does not _redirect_ anything. It simply de-duplicates cache objects by re-writing the location where certain ones are stored, so it is different to where their URL would store it. If a backend server needs to be contacted the one the clients was going to will be contacted and the shared Store-ID location gets updated with any new data that server produces. > > /var/ipfire/proxy/advanced/acls/include.acl > #squid.conf > acl cacheDomain dstdomain .steampowered.com .edgesuite.net .steamstatic.com > .steamcontent.com > cache deny !cacheDomain > store_id_program /usr/lib/squid/storeid_file_rewrite > /etc/squid/storeid_rewrite.conf > store_id_children 10 startup=3 idle=1 concurrency=0 > > /etc/squid/storeid_rewrite.conf > ^http.*steam.*\.com\/(.*) http://steamupdates.squid.internal/$1 > I highly recommend that you make that pattern a LOT more targeted. The presence of ".*" allows any URL that happens to include the word "steam" and then ".com/" to have its final portion stored in your cache as "game content". > The issue appears to be stemming from how squid and storeID_rewrite > interact; currently if I test the storeid_rewrite.conf with the following > command: > echo http://valve314.steamcontent.com/depot/255711/chunk/ > a3f17a1be9c7861cbc56d1098b8ede146e114391? | /usr/lib/squid/storeid_file_rewrite > /etc/squid/storeid_rewrite.conf > I get in return: > OK store-id=http://steamupdates.squid.internal/depot/255711/chunk/ > a3f17a1be9c7861cbc56d1098b8ede146e114391? > NOTE: when your log contains URLs ending in '?' check that you have turned off the strip_query_terms mechanism before debugging. Otherwise that significant part of the URLs will be hidden from you, and your test results may be different from expectations. <http://www.squid-cache.org/Doc/config/strip_query_terms/> > This indicates that storeID rewrite is functioning and using my RegEx > command to rewrite the URL into one that only contains the unique game and > chunk IDs from the URL. No, the new key contains anything that happened to follow the string ".com/". eg. http://haha.example.net/steam/gotcha.com/depot/255711/chunk/a3f17a1be9c7861cbc56d1098b8ede146e114391?boo > The issue is when I test the entire system using > the following process I see multiple entries into the squid cache for the > specific game chunk ID: > > - Remove /var/log/squid/access.log to ensure no previous attempts will > appear in test > - Clear the cache through ipFire webUI > - Restart Squid cache service through ipFire webUI > - Download game through Steam interface > - Verify Squid cached the download chunks by grepping through both > /var/log/squid/access.log and Squid cache for specific game chunk IDs (this > is a spot check at best) > - Change Steam CDN location through Steam UI > - Delete Steam game local content > - Re-download Steam game > - Verify Squid cache using game chunk ID > > The command used to grep against the Squid cache and it's results are as > follows: > squidclient -h 192.168.1.1 cache_object://192.168.1.1 mgr:objects | grep > f37f9405e2f38417a226eac378ac3982223d2966? > GET http://valve608.steamcontent.com/depot/26502/chunk/ > f37f9405e2f38417a226eac378ac3982223d2966? > GET http://valve313.steamcontent.com/depot/26502/chunk/ > f37f9405e2f38417a226eac378ac3982223d2966? > See the note above about strip_query_terms. If a single byte of any of the query portion of those URLs is different then your Store-ID keys for them will be likewise different. Since *everything* following the ".com/" is part of the Store-ID key produced by your pattern. > This indicates that at some point in the process, Squid is generating a KEY > entry for the chunk based off the original Steam CDN URL and NOT the > RegEx'd URL storeID_rewrite is supposedly generating. The mgr:objects report lists the client request that object was a response to. <http://wiki.squid-cache.org/Features/CacheManager/Objects> So the test above just indicates that objects exist which were stored from those URLs. Client requests are of course not for the Store-ID keys, but (one of) the actual URLs for that object. > I have attempted to determine how Squid is generating it's KEY entries for > the chunks it is storing, but have had no luck (basing attempts off this white > paper entry <http://www.squid-cache.org/CacheDigest/cache-digest-v5.txt>) That is about using digests used to inform other proxies about what is possibly still in cache. Nothing to do with the storage itself. And should not contain Store-ID keys (if it does that is a bug). > At this point I've exhausted my limited knowledge of how Squid and storeID > rewrite function and any assistance would be quite welcome; please let me > know if there's any further info needed to try and crack this walnut open! > Start with disabling strip_query_terms. Then check the Store-ID keys actually contain only the usefully different parts of the URL(s) input. Amos _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
