X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=src%2Fyaz-proxy.cpp;h=a73c95a5ce4caa3983581e6df2fb490b38de96f9;hb=966d1a0443071c2b75426d0214bfb9960c5c3fba;hp=a61233e57d007a6ab7b6d57724b574b479d61392;hpb=66767801433aba6cd2ac9fc744a1057867df7fa9;p=yazpp-moved-to-github.git diff --git a/src/yaz-proxy.cpp b/src/yaz-proxy.cpp index a61233e..a73c95a 100644 --- a/src/yaz-proxy.cpp +++ b/src/yaz-proxy.cpp @@ -1,47 +1,15 @@ /* - * Copyright (c) 1998-1999, Index Data. + * Copyright (c) 1998-2001, Index Data. * See the file LICENSE for details. - * Sebastian Hammer, Adam Dickmeiss * - * $Log: yaz-proxy.cpp,v $ - * 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. - * - * Revision 1.3 1999/04/09 11:46:57 adam - * Added object Yaz_Z_Assoc. Much more functional client. - * - * Revision 1.2 1999/01/28 13:08:46 adam - * Yaz_PDU_Assoc better encapsulated. Memory leak fix in - * yaz-socket-manager.cc. - * - * Revision 1.1.1.1 1999/01/28 09:41:07 adam - * First implementation of YAZ++. - * + * $Id: yaz-proxy.cpp,v 1.28 2001-11-04 22:36:21 adam Exp $ */ #include +#include -#include - -#include +#include +#include Yaz_Proxy::Yaz_Proxy(IYaz_PDU_Observable *the_PDU_Observable) : Yaz_Z_Assoc(the_PDU_Observable) @@ -52,18 +20,32 @@ 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); } -IYaz_PDU_Observer *Yaz_Proxy::clone(IYaz_PDU_Observable - *the_PDU_Observable) +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::sessionNotify(IYaz_PDU_Observable + *the_PDU_Observable, int fd) { Yaz_Proxy *new_proxy = new Yaz_Proxy(the_PDU_Observable); new_proxy->m_parent = this; - new_proxy->timeout(120); + new_proxy->timeout(500); + new_proxy->set_proxyTarget(m_proxyTarget); + new_proxy->set_APDU_log(get_APDU_log()); return new_proxy; } @@ -108,47 +90,152 @@ 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 : + yaz_log (LOG_LOG, "Yaz_Proxy::get_client cookie=%s", cookie ? cookie : "null"); - if (cookie) + + const char *proxy_host = get_proxy(oi); + if (proxy_host) + set_proxyTarget(proxy_host); + yaz_log (LOG_LOG, "proxy_host = %s", m_proxyTarget ? m_proxyTarget:"none"); + + // no target specified at all? + if (!m_proxyTarget) + return 0; + + if (cookie && *cookie) { + yaz_log (LOG_LOG, "lookup of clients cookie=%s target=%s", + cookie, m_proxyTarget); + Yaz_ProxyClient *cc = 0; + for (c = parent->m_clientPool; c; c = c->m_next) { + yaz_log (LOG_LOG, " found client cookie = %s target=%s seqno=%d", + c->m_cookie, c->get_hostname(), c->m_seqno); assert (c->m_prev); assert (*c->m_prev == c); - if (!strcmp(cookie,c->m_cookie)) + if (!strcmp(cookie,c->m_cookie) && + !strcmp(m_proxyTarget, c->get_hostname())) { - logf (LOG_LOG, "Yaz_Proxy::get_client cached"); - return c; + yaz_log (LOG_LOG, "found!"); + cc = c; } } - + if (cc) + { + // found it in cache + c = cc; + // The following handles "cancel" + // If connection is busy (waiting for PDU) and + // we have an initRequest we can safely do re-open + if (c->m_waiting && apdu->which == Z_APDU_initRequest) + { + yaz_log (LOG_LOG, "reopen target=%s", c->get_hostname()); + c->close(); + 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->m_waiting = 0; + c->timeout(600); + } + c->m_seqno = parent->m_seqno; + if (c->m_server && c->m_server != this) + c->m_server->m_client = 0; + c->m_server = this; + c->m_seqno = parent->m_seqno; + (parent->m_seqno)++; + yaz_log (LOG_LOG, "get_client 1 %p %p", this, c); + 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) + if (apdu->which != Z_APDU_initRequest) { - logf (LOG_LOG, "got InitRequest"); + yaz_log (LOG_LOG, "no first INIT!"); + return 0; + } + yaz_log (LOG_LOG, "got InitRequest"); - char *proxy_host = get_proxy(&apdu->u.initRequest->otherInfo); - if (proxy_host) - c->client(proxy_host); + // go through list of clients - and find the lowest/oldest one. + 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++; + 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; + if (c->m_waiting || strcmp(m_proxyTarget, c->get_hostname())) + { + yaz_log (LOG_LOG, "Yaz_Proxy::get_client re-init session %d", + c->m_seqno); + if (c->m_server && c->m_server != this) + delete c->m_server; + c->m_server = 0; + } else - c->client("localhost:9999"); + { + yaz_log (LOG_LOG, + "Yaz_Proxy::get_client re-use session %d to %d", + c->m_seqno, parent->m_seqno); + if (cookie) + strcpy (c->m_cookie, cookie); + else + c->m_cookie[0] = '\0'; + c->m_seqno = parent->m_seqno; + if (c->m_server && c->m_server != this) + { + c->m_server->m_client = 0; + delete c->m_server; + } + (parent->m_seqno)++; + yaz_log (LOG_LOG, "get_client 2 %p %p", this, c); + return c; + } + } + else + { + yaz_log (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; } - c->timeout(600); + if (cookie) + strcpy (c->m_cookie, cookie); + else + c->m_cookie[0] = '\0'; + yaz_log (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->m_waiting = 0; + c->timeout(10); + + (parent->m_seqno)++; } + yaz_log (LOG_LOG, "get_client 3 %p %p", this, c); return c; } @@ -169,6 +256,7 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) m_client->m_last_resultCount < *sr->largeSetLowerBound) { // medium Set + yaz_log (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; @@ -189,6 +277,7 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) m_client->m_last_resultCount == 0) { // large set + yaz_log (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 = @@ -199,6 +288,7 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) else { // small set + yaz_log (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; @@ -218,7 +308,7 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) } else { - logf (LOG_LOG, "query doesn't match"); + yaz_log (LOG_LOG, "Yaz_Proxy::result_set_optimize new set"); delete m_client->m_last_query; m_client->m_last_query = this_query; } @@ -227,7 +317,7 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) void Yaz_Proxy::recv_Z_PDU(Z_APDU *apdu) { - logf (LOG_LOG, "Yaz_Proxy::recv_Z_PDU"); + yaz_log (LOG_LOG, "Yaz_Proxy::recv_Z_PDU"); // Determine our client. m_client = get_client(apdu); if (!m_client) @@ -237,12 +327,6 @@ 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; -#endif - if (apdu->which == Z_APDU_initRequest) { if (m_client->m_init_flag) @@ -260,39 +344,85 @@ void Yaz_Proxy::recv_Z_PDU(Z_APDU *apdu) if (!apdu) return; - logf (LOG_LOG, "Yaz_ProxyClient::send_Z_PDU"); + yaz_log (LOG_LOG, "Yaz_ProxyClient::send_Z_PDU %s", + m_client->get_hostname()); + + // delete other info part from PDU before sending to target + Z_OtherInformation **oi; + get_otherInfoAPDU(apdu, &oi); + if (oi) + *oi = 0; + if (m_client->send_Z_PDU(apdu) < 0) { delete m_client; + m_client = 0; delete this; } + else + m_client->m_waiting = 1; } -void Yaz_Proxy::failNotify() +void Yaz_Proxy::connectNotify() +{ +} + +void Yaz_Proxy::shutdown() { - logf (LOG_LOG, "failNotity server"); - if (m_keepalive) + yaz_log (LOG_LOG, "shutdown (client to proxy)"); + // only keep if keep_alive flag and cookie is set... + if (m_keepalive && m_client && m_client->m_cookie[0]) { + yaz_log (LOG_LOG, "shutdown - keepalive this=%p, m_server=%p", + this, m_client->m_server); + if (m_client->m_waiting == 2) + abort(); // Tell client (if any) that no server connection is there.. - if (m_client) - m_client->m_server = 0; + m_client->m_server = 0; } - else + else if (m_client) { + yaz_log (LOG_LOG, "deleting %p %p", this, m_client); + if (m_client->m_waiting == 2) + abort(); delete m_client; } + else if (!m_parent) + { + yaz_log (LOG_LOG, "abort %p", this); + abort(); + } delete this; } -void Yaz_ProxyClient::failNotify() +void Yaz_ProxyClient::shutdown() { - logf (LOG_LOG, "failNotity client"); + yaz_log (LOG_LOG, "shutdown (proxy to server) %s", get_hostname()); delete m_server; delete this; } -IYaz_PDU_Observer *Yaz_ProxyClient::clone(IYaz_PDU_Observable - *the_PDU_Observable) +void Yaz_Proxy::failNotify() +{ + yaz_log (LOG_LOG, "connection closed by client"); + shutdown(); +} + +void Yaz_ProxyClient::failNotify() +{ + yaz_log (LOG_LOG, "Yaz_ProxyClient connection closed by %s", get_hostname()); + shutdown(); +} + +void Yaz_ProxyClient::connectNotify() +{ + yaz_log (LOG_LOG, "Yaz_ProxyClient connection accepted by %s", + get_hostname()); + timeout(600); +} + +IYaz_PDU_Observer *Yaz_ProxyClient::sessionNotify(IYaz_PDU_Observable + *the_PDU_Observable, int fd) { return new Yaz_ProxyClient(the_PDU_Observable); } @@ -300,22 +430,23 @@ IYaz_PDU_Observer *Yaz_ProxyClient::clone(IYaz_PDU_Observable Yaz_ProxyClient::~Yaz_ProxyClient() { if (m_prev) - { *m_prev = m_next; - if (m_next) - m_next->m_prev = m_prev; - } + if (m_next) + m_next->m_prev = m_prev; + m_waiting = 2; // for debugging purposes only. delete m_last_query; } void Yaz_Proxy::timeoutNotify() { - failNotify(); + yaz_log (LOG_LOG, "timeout (client to proxy)"); + shutdown(); } void Yaz_ProxyClient::timeoutNotify() { - failNotify(); + yaz_log (LOG_LOG, "timeout (proxy to target) %s", get_hostname()); + shutdown(); } Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable) : @@ -328,13 +459,25 @@ Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable) : m_last_query = 0; m_last_resultCount = 0; m_sr_transform = 0; + m_waiting = 0; } void Yaz_ProxyClient::recv_Z_PDU(Z_APDU *apdu) { - logf (LOG_LOG, "Yaz_ProxyClient::recv_Z_PDU"); + m_waiting = 0; + yaz_log (LOG_LOG, "Yaz_ProxyClient::recv_Z_PDU %s", get_hostname()); if (apdu->which == Z_APDU_searchResponse) + { m_last_resultCount = *apdu->u.searchResponse->resultCount; + int status = *apdu->u.searchResponse->searchStatus; + if (! status || ( + apdu->u.searchResponse->records && + apdu->u.searchResponse->records->which != Z_Records_DBOSD)) + { + delete m_last_query; + m_last_query = 0; + } + } if (apdu->which == Z_APDU_presentResponse && m_sr_transform) { m_sr_transform = 0; @@ -352,7 +495,7 @@ void Yaz_ProxyClient::recv_Z_PDU(Z_APDU *apdu) set_otherInformationString (apdu, VAL_COOKIE, 1, m_cookie); if (m_server) { - logf (LOG_LOG, "Yaz_Proxy::send_Z_PDU"); + yaz_log (LOG_LOG, "Yaz_Proxy::send_Z_PDU"); m_server->send_Z_PDU(apdu); } }