* Sebastian Hammer, Adam Dickmeiss
*
* $Log: yaz-proxy.cpp,v $
- * Revision 1.4 1999-04-20 10:30:05 adam
+ * Revision 1.9 1999-09-13 12:53:44 adam
+ * Proxy removes OtherInfo Proxy Address and Session ID. Other
+ * Otherinfo remains untouched.
+ *
+ * Revision 1.8 1999/05/04 10:53:00 adam
+ * Changed the way the PROXY behaves when lost cookie is received.
+ *
+ * Revision 1.7 1999/04/28 13:31:17 adam
+ * Better result set optimisation for proxy.
+ *
+ * Revision 1.6 1999/04/27 07:52:13 adam
+ * Improved proxy; added query match for result set re-use.
+ *
+ * Revision 1.5 1999/04/21 12:09:01 adam
+ * Many improvements. Modified to proxy server to work with "sessions"
+ * based on cookies.
+ *
+ * Revision 1.4 1999/04/20 10:30:05 adam
* Implemented various stuff for client and proxy. Updated calls
* to ODR to reflect new name parameter.
*
{
m_PDU_Observable = the_PDU_Observable;
m_client = 0;
+ m_parent = 0;
+ m_clientPool = 0;
+ m_seqno = 1;
+ m_keepalive = 1;
}
Yaz_Proxy::~Yaz_Proxy()
IYaz_PDU_Observer *Yaz_Proxy::clone(IYaz_PDU_Observable
*the_PDU_Observable)
{
- return new Yaz_Proxy(the_PDU_Observable);
+ Yaz_Proxy *new_proxy = new Yaz_Proxy(the_PDU_Observable);
+ new_proxy->m_parent = this;
+ new_proxy->timeout(120);
+ return new_proxy;
}
char *Yaz_Proxy::get_cookie(Z_OtherInformation **otherInfo)
ent.proto = PROTO_Z3950;
ent.oclass = CLASS_USERINFO;
ent.value = (oid_value) VAL_COOKIE;
- if (oid_ent_to_oid (&ent, oid) &&
- (oi = update_otherInformation(otherInfo, 0, oid, 1)) &&
+ assert (oid_ent_to_oid (&ent, oid));
+
+ if (oid_ent_to_oid (&ent, oid) &&
+ (oi = update_otherInformation(otherInfo, 0, oid, 1, 1)) &&
oi->which == Z_OtherInfo_characterInfo)
return oi->information.characterInfo;
return 0;
ent.oclass = CLASS_USERINFO;
ent.value = (oid_value) VAL_PROXY;
if (oid_ent_to_oid (&ent, oid) &&
- (oi = update_otherInformation(otherInfo, 0, oid, 1)) &&
+ (oi = update_otherInformation(otherInfo, 0, oid, 1, 1)) &&
oi->which == Z_OtherInfo_characterInfo)
return oi->information.characterInfo;
return 0;
}
+Yaz_ProxyClient *Yaz_Proxy::get_client(Z_APDU *apdu)
+{
+ assert (m_parent);
+ Yaz_Proxy *parent = m_parent;
+ Z_OtherInformation **oi;
+ Yaz_ProxyClient *c = m_client;
+
+ get_otherInfoAPDU(apdu, &oi);
+ char *cookie = get_cookie(oi);
+ logf (LOG_LOG, "Yaz_Proxy::get_client cookie=%s", cookie ? cookie :
+ "null");
+ if (cookie)
+ {
+ for (c = parent->m_clientPool; c; c = c->m_next)
+ {
+ assert (c->m_prev);
+ assert (*c->m_prev == c);
+ if (!strcmp(cookie,c->m_cookie))
+ {
+ logf (LOG_LOG, "Yaz_Proxy::get_client cached");
+ return c;
+ }
+ }
+
+ }
+ if (!m_client)
+ {
+ logf (LOG_LOG, "Yaz_Proxy::get_client creating new");
+ c = new Yaz_ProxyClient(m_PDU_Observable->clone());
+ c->m_next = parent->m_clientPool;
+ if (c->m_next)
+ c->m_next->m_prev = &c->m_next;
+ parent->m_clientPool = c;
+ c->m_prev = &parent->m_clientPool;
+
+ sprintf (c->m_cookie, "%d", parent->m_seqno);
+ (parent->m_seqno)++;
+
+ if (apdu->which == Z_APDU_initRequest)
+ {
+ logf (LOG_LOG, "got InitRequest");
+
+ char *proxy_host = get_proxy(&apdu->u.initRequest->otherInfo);
+ if (proxy_host)
+ c->client(proxy_host);
+ else
+ c->client("localhost:9999");
+ }
+ c->timeout(600);
+ }
+ return c;
+}
+
+Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu)
+{
+ if (apdu->which != Z_APDU_searchRequest)
+ return apdu;
+ Z_SearchRequest *sr = apdu->u.searchRequest;
+ Yaz_Z_Query *this_query = new Yaz_Z_Query;
+
+ this_query->set_Z_Query(sr->query);
+
+ if (m_client->m_last_query &&
+ m_client->m_last_query->match(this_query))
+ {
+ delete this_query;
+ if (m_client->m_last_resultCount > *sr->smallSetUpperBound &&
+ m_client->m_last_resultCount < *sr->largeSetLowerBound)
+ {
+ // medium Set
+ Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest);
+ Z_PresentRequest *pr = new_apdu->u.presentRequest;
+ pr->referenceId = sr->referenceId;
+ pr->resultSetId = sr->resultSetName;
+ pr->preferredRecordSyntax = sr->preferredRecordSyntax;
+ *pr->numberOfRecordsRequested = *sr->mediumSetPresentNumber;
+ if (sr->mediumSetElementSetNames)
+ {
+ pr->recordComposition = (Z_RecordComposition *)
+ odr_malloc(odr_encode(), sizeof(Z_RecordComposition));
+ pr->recordComposition->which = Z_RecordComp_simple;
+ pr->recordComposition->u.simple = sr->mediumSetElementSetNames;
+ }
+ m_client->m_sr_transform = 1;
+ return new_apdu;
+ }
+ else if (m_client->m_last_resultCount >= *sr->largeSetLowerBound ||
+ m_client->m_last_resultCount == 0)
+ {
+ // large set
+ Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
+ new_apdu->u.searchResponse->referenceId = sr->referenceId;
+ new_apdu->u.searchResponse->resultCount =
+ &m_client->m_last_resultCount;
+ send_Z_PDU(new_apdu);
+ return 0;
+ }
+ else
+ {
+ // small set
+ Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest);
+ Z_PresentRequest *pr = new_apdu->u.presentRequest;
+ pr->referenceId = sr->referenceId;
+ pr->resultSetId = sr->resultSetName;
+ pr->preferredRecordSyntax = sr->preferredRecordSyntax;
+ *pr->numberOfRecordsRequested = m_client->m_last_resultCount;
+ if (sr->smallSetElementSetNames)
+ {
+ pr->recordComposition = (Z_RecordComposition *)
+ odr_malloc(odr_encode(), sizeof(Z_RecordComposition));
+ pr->recordComposition->which = Z_RecordComp_simple;
+ pr->recordComposition->u.simple = sr->smallSetElementSetNames;
+ }
+ m_client->m_sr_transform = 1;
+ return new_apdu;
+ }
+ }
+ else
+ {
+ logf (LOG_LOG, "query doesn't match");
+ delete m_client->m_last_query;
+ m_client->m_last_query = this_query;
+ }
+ return apdu;
+}
+
void Yaz_Proxy::recv_Z_PDU(Z_APDU *apdu)
{
+ logf (LOG_LOG, "Yaz_Proxy::recv_Z_PDU");
+ // Determine our client.
+ m_client = get_client(apdu);
+ if (!m_client)
+ {
+ delete this;
+ return;
+ }
+ m_client->m_server = this;
+
+#if 0
+ Z_OtherInformation **oi;
+ get_otherInfoAPDU(apdu, &oi);
+ *oi = 0;
+#endif
+
if (apdu->which == Z_APDU_initRequest)
{
- assert (m_client == 0);
- logf (LOG_LOG, "got InitRequest");
- m_client = new Yaz_ProxyClient(m_PDU_Observable->clone());
- m_client->m_server = this;
-
- char *proxy_host = get_cookie(&apdu->u.initRequest->otherInfo);
- if (proxy_host)
- m_client->client(proxy_host);
- else
- m_client->client("localhost:8888");
+ if (m_client->m_init_flag)
+ {
+ Z_APDU *apdu = create_Z_PDU(Z_APDU_initResponse);
+ if (m_client->m_cookie)
+ set_otherInformationString(apdu, VAL_COOKIE, 1,
+ m_client->m_cookie);
+ send_Z_PDU(apdu);
+ return;
+ }
+ m_client->m_init_flag = 1;
+ }
+ apdu = result_set_optimize(apdu);
+ if (!apdu)
+ return;
+
+ logf (LOG_LOG, "Yaz_ProxyClient::send_Z_PDU");
+ if (m_client->send_Z_PDU(apdu) < 0)
+ {
+ delete m_client;
+ delete this;
}
- assert (m_client);
- logf (LOG_LOG, "sending PDU");
- m_client->send_Z_PDU(apdu);
}
void Yaz_Proxy::failNotify()
{
logf (LOG_LOG, "failNotity server");
- delete m_client;
+ if (m_keepalive)
+ {
+ // Tell client (if any) that no server connection is there..
+ if (m_client)
+ m_client->m_server = 0;
+ }
+ else
+ {
+ delete m_client;
+ }
delete this;
}
return new Yaz_ProxyClient(the_PDU_Observable);
}
+Yaz_ProxyClient::~Yaz_ProxyClient()
+{
+ if (m_prev)
+ {
+ *m_prev = m_next;
+ if (m_next)
+ m_next->m_prev = m_prev;
+ }
+ delete m_last_query;
+}
+
+void Yaz_Proxy::timeoutNotify()
+{
+ failNotify();
+}
+
+void Yaz_ProxyClient::timeoutNotify()
+{
+ failNotify();
+}
+
Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable) :
Yaz_Z_Assoc (the_PDU_Observable)
{
- m_cookie = 0;
+ m_cookie[0] = 0;
m_next = 0;
+ m_prev = 0;
+ m_init_flag = 0;
+ m_last_query = 0;
+ m_last_resultCount = 0;
+ m_sr_transform = 0;
}
void Yaz_ProxyClient::recv_Z_PDU(Z_APDU *apdu)
{
- m_server->send_Z_PDU(apdu);
+ logf (LOG_LOG, "Yaz_ProxyClient::recv_Z_PDU");
+ if (apdu->which == Z_APDU_searchResponse)
+ m_last_resultCount = *apdu->u.searchResponse->resultCount;
+ if (apdu->which == Z_APDU_presentResponse && m_sr_transform)
+ {
+ m_sr_transform = 0;
+ Z_PresentResponse *pr = apdu->u.presentResponse;
+ Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
+ Z_SearchResponse *sr = new_apdu->u.searchResponse;
+ sr->referenceId = pr->referenceId;
+ *sr->resultCount = m_last_resultCount;
+ sr->records = pr->records;
+ sr->nextResultSetPosition = pr->nextResultSetPosition;
+ sr->numberOfRecordsReturned = pr->numberOfRecordsReturned;
+ apdu = new_apdu;
+ }
+ if (m_cookie)
+ set_otherInformationString (apdu, VAL_COOKIE, 1, m_cookie);
+ if (m_server)
+ {
+ logf (LOG_LOG, "Yaz_Proxy::send_Z_PDU");
+ m_server->send_Z_PDU(apdu);
+ }
}
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