X-Git-Url: http://sru.miketaylor.org.uk/?a=blobdiff_plain;f=src%2Fyaz-proxy.cpp;h=df3615d1ad7e1c9b3f8e529bc756bb879a9114ed;hb=6104ba97908b1292806a1242b65beb0edbf2314f;hp=beff26cdf47a5d9b4989eccbfdf51082b3e86ee6;hpb=5c45ffbb2b430a6f41277c303a5e9b94242dab96;p=yazpp-moved-to-github.git diff --git a/src/yaz-proxy.cpp b/src/yaz-proxy.cpp index beff26c..df3615d 100644 --- a/src/yaz-proxy.cpp +++ b/src/yaz-proxy.cpp @@ -1,10 +1,39 @@ /* - * Copyright (c) 1998-1999, Index Data. + * Copyright (c) 1998-2000, Index Data. * See the file LICENSE for details. * Sebastian Hammer, Adam Dickmeiss * * $Log: yaz-proxy.cpp,v $ - * Revision 1.5 1999-04-21 12:09:01 adam + * Revision 1.14 2000-08-10 08:42:42 adam + * Fixes for {set,get}_APDU_log. + * + * Revision 1.13 2000/08/07 14:19:59 adam + * Fixed serious bug regarding timeouts. Improved logging for proxy. + * + * Revision 1.12 2000/07/04 13:48:49 adam + * Implemented upper-limit on proxy-to-target sessions. + * + * Revision 1.11 1999/12/06 13:52:45 adam + * Modified for new location of YAZ header files. Experimental threaded + * operation. + * + * Revision 1.10 1999/11/10 10:02:34 adam + * Work on proxy. + * + * 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. * @@ -25,9 +54,9 @@ */ #include +#include -#include - +#include #include Yaz_Proxy::Yaz_Proxy(IYaz_PDU_Observable *the_PDU_Observable) : @@ -39,10 +68,22 @@ Yaz_Proxy::Yaz_Proxy(IYaz_PDU_Observable *the_PDU_Observable) : m_clientPool = 0; m_seqno = 1; m_keepalive = 1; + m_proxyTarget = 0; + m_max_clients = 50; + m_seed = time(0); } Yaz_Proxy::~Yaz_Proxy() { + xfree (m_proxyTarget); +} + +void Yaz_Proxy::set_proxyTarget(const char *target) +{ + xfree (m_proxyTarget); + m_proxyTarget = 0; + if (target) + m_proxyTarget = (char *) xstrdup (target); } IYaz_PDU_Observer *Yaz_Proxy::clone(IYaz_PDU_Observable @@ -51,6 +92,8 @@ IYaz_PDU_Observer *Yaz_Proxy::clone(IYaz_PDU_Observable Yaz_Proxy *new_proxy = new Yaz_Proxy(the_PDU_Observable); new_proxy->m_parent = this; new_proxy->timeout(120); + new_proxy->set_proxyTarget(m_proxyTarget); + new_proxy->set_APDU_log(get_APDU_log()); return new_proxy; } @@ -65,7 +108,7 @@ char *Yaz_Proxy::get_cookie(Z_OtherInformation **otherInfo) assert (oid_ent_to_oid (&ent, oid)); 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; @@ -80,7 +123,7 @@ char *Yaz_Proxy::get_proxy(Z_OtherInformation **otherInfo) 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; @@ -96,7 +139,7 @@ Yaz_ProxyClient *Yaz_Proxy::get_client(Z_APDU *apdu) 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) @@ -105,39 +148,161 @@ Yaz_ProxyClient *Yaz_Proxy::get_client(Z_APDU *apdu) assert (*c->m_prev == c); if (!strcmp(cookie,c->m_cookie)) { - logf (LOG_LOG, "Yaz_Proxy::get_client cached"); - break; + logf (LOG_LOG, "Yaz_Proxy::get_client cached %s", + c->get_hostname()); + c->m_seqno = parent->m_seqno; + return c; } - } + } } - else if (!m_client) + 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); + const char *proxy_host = + get_proxy(&apdu->u.initRequest->otherInfo); if (proxy_host) - c->client(proxy_host); - else - c->client("localhost:9999"); + set_proxyTarget(proxy_host); + logf (LOG_LOG, "proxy_host = %s", m_proxyTarget ? + m_proxyTarget:"none"); } + else + { + logf (LOG_LOG, "no first INIT!"); + return 0; + } + if (!m_proxyTarget) + return 0; + + Yaz_ProxyClient *c_min = 0; + int min_seq = -1; + int no_of_clients = 0; + for (c = parent->m_clientPool; c; c = c->m_next) + { + no_of_clients++; + logf (LOG_LOG, "found seqno = %d", c->m_seqno); + if (min_seq < 0 || c->m_seqno < min_seq) + { + min_seq = c->m_seqno; + c_min = c; + } + } + if (no_of_clients >= parent->m_max_clients) + { + c = c_min; + logf (LOG_LOG, "Yaz_Proxy::get_client re-using session %d", + c->m_seqno); + if (c->m_server) + delete c->m_server; + c->m_server = 0; + } + else + { + logf (LOG_LOG, "Yaz_Proxy::get_client making session %d", + parent->m_seqno); + 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, "%lx.%d", m_seed, parent->m_seqno); + logf (LOG_LOG, "Yaz_Proxy::get_client connect to %s", m_proxyTarget); + c->m_seqno = parent->m_seqno; + c->client(m_proxyTarget); + c->m_init_flag = 0; + + delete c->m_last_query; + c->m_last_query = 0; + c->m_last_resultCount = 0; + c->m_sr_transform = 0; + c->timeout(600); + + (parent->m_seqno)++; } 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 + logf (LOG_LOG, "Yaz_Proxy::result_set_optimize 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 + logf (LOG_LOG, "Yaz_Proxy::result_set_optimize 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 + logf (LOG_LOG, "Yaz_Proxy::result_set_optimize 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, "Yaz_Proxy::result_set_optimize new set"); + 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"); @@ -150,10 +315,30 @@ void Yaz_Proxy::recv_Z_PDU(Z_APDU *apdu) } m_client->m_server = this; +#if 0 Z_OtherInformation **oi; get_otherInfoAPDU(apdu, &oi); *oi = 0; - logf (LOG_LOG, "Yaz_ProxyClient::send_Z_PDU"); +#endif + + if (apdu->which == Z_APDU_initRequest) + { + 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 %s", m_client->get_hostname()); if (m_client->send_Z_PDU(apdu) < 0) { delete m_client; @@ -161,12 +346,16 @@ void Yaz_Proxy::recv_Z_PDU(Z_APDU *apdu) } } -void Yaz_Proxy::failNotify() +void Yaz_Proxy::connectNotify() +{ +} + +void Yaz_Proxy::shutdown() { - logf (LOG_LOG, "failNotity server"); + logf (LOG_LOG, "shutdown (client to proxy)"); if (m_keepalive) { - // Tell client (if any) that not server connection is there.. + // Tell client (if any) that no server connection is there.. if (m_client) m_client->m_server = 0; } @@ -177,13 +366,30 @@ void Yaz_Proxy::failNotify() delete this; } -void Yaz_ProxyClient::failNotify() +void Yaz_ProxyClient::shutdown() { - logf (LOG_LOG, "failNotity client"); + logf (LOG_LOG, "shutdown (proxy to server) %s", get_hostname()); delete m_server; delete this; } +void Yaz_Proxy::failNotify() +{ + logf (LOG_LOG, "connection closed by client"); + shutdown(); +} + +void Yaz_ProxyClient::failNotify() +{ + logf (LOG_LOG, "Yaz_ProxyClient connection closed by %s", get_hostname()); + shutdown(); +} + +void Yaz_ProxyClient::connectNotify() +{ + logf (LOG_LOG, "Yaz_ProxyClient connection accept by %s", get_hostname()); +} + IYaz_PDU_Observer *Yaz_ProxyClient::clone(IYaz_PDU_Observable *the_PDU_Observable) { @@ -198,16 +404,19 @@ Yaz_ProxyClient::~Yaz_ProxyClient() if (m_next) m_next->m_prev = m_prev; } + delete m_last_query; } void Yaz_Proxy::timeoutNotify() { - failNotify(); + logf (LOG_LOG, "timeout (client to proxy)"); + shutdown(); } void Yaz_ProxyClient::timeoutNotify() { - failNotify(); + logf (LOG_LOG, "timeout (proxy to target) %s", get_hostname()); + shutdown(); } Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable) : @@ -216,11 +425,30 @@ Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable) : 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) { - logf (LOG_LOG, "Yaz_ProxyClient::recv_Z_PDU"); + logf (LOG_LOG, "Yaz_ProxyClient::recv_Z_PDU %s", get_hostname()); + 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)