/**
* Lookup up a key in the database is a two step process:
*
* a) First we look for any Entries in the database that might apply to this
* url. For each URL there are one or two possible domain names to check:
* the two-part domain name (example.com) and the three-part name
* (www.example.com). We check the database for both of these.
* b) If we find any entries, we check the list of fragments for that entry
* against the possible subfragments of the URL as described in the
* "Simplified Regular Expression Lookup" section of the protocol doc.
*/
nsresult
nsUrlClassifierDBServiceWorker::DoLookup(const nsACString& spec,
nsIUrlClassifierLookupCallback* c)
{
if (gShuttingDownThread) {
c->LookupComplete(nsnull);
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = OpenDb();
if (NS_FAILED(rv)) {
c->LookupComplete(nsnull);
return NS_ERROR_FAILURE;
}
#if defined(PR_LOGGING)
PRIntervalTime clockStart = 0;
if (LOG_ENABLED()) {
clockStart = PR_IntervalNow();
}
#endif
nsAutoPtr<LookupResultArray> results(new LookupResultArray());
if (!results) {
c->LookupComplete(nsnull);
return NS_ERROR_OUT_OF_MEMORY;
}
// we ignore failures from Check because we'd rather return the
// results that were found than fail.
mClassifier->SetFreshTime(gFreshnessGuarantee);
mClassifier->Check(spec, *results);
LOG(("Found %d results.", results->Length()));
#if defined(PR_LOGGING)
if (LOG_ENABLED()) {
PRIntervalTime clockEnd = PR_IntervalNow();
LOG(("query took %dms\n",
PR_IntervalToMilliseconds(clockEnd - clockStart)));
}
#endif
nsAutoPtr<LookupResultArray> completes(new LookupResultArray());
for (PRUint32 i = 0; i < results->Length(); i++) {
if (!mMissCache.Contains(results->ElementAt(i).hash.prefix)) {
completes->AppendElement(results->ElementAt(i));
}
}
for (PRUint32 i = 0; i < completes->Length(); i++) {
if (!completes->ElementAt(i).Confirmed()) {
// We're going to be doing a gethash request, add some extra entries.
// Note that we cannot pass the first two by reference, because we
// add to completes, whicah can cause completes to reallocate and move.
AddNoise(completes->ElementAt(i).mCodedPrefix,
completes->ElementAt(i).mTableName,
mGethashNoise, *completes);
break;
}
}
// At this point ownership of 'results' is handed to the callback.
c->LookupComplete(completes.forget());
return NS_OK;
}
