X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=src%2Fyaz-proxy.cpp;h=f61547abae8f6dbf654a52851f463846ed2344a0;hb=b3d26248b0c906f1a487d65aae5a2a33d91e8fde;hp=a61233e57d007a6ab7b6d57724b574b479d61392;hpb=66767801433aba6cd2ac9fc744a1057867df7fa9;p=yazpp-moved-to-github.git diff --git a/src/yaz-proxy.cpp b/src/yaz-proxy.cpp index a61233e..f61547a 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 1.37 2002-10-23 10:15:18 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 +20,47 @@ Yaz_Proxy::Yaz_Proxy(IYaz_PDU_Observable *the_PDU_Observable) : m_clientPool = 0; m_seqno = 1; m_keepalive = 1; + m_proxyTarget = 0; + m_proxy_authentication = 0; + m_max_clients = 50; + m_seed = time(0); + m_idletime = 600; + m_optimize = xstrdup ("1"); } Yaz_Proxy::~Yaz_Proxy() { + xfree (m_proxyTarget); + xfree (m_proxy_authentication); + xfree (m_optimize); +} + +void Yaz_Proxy::set_proxy_target(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 - *the_PDU_Observable) +void Yaz_Proxy::set_proxy_authentication (const char *auth) +{ + xfree (m_proxy_authentication); + m_proxy_authentication = 0; + if (auth) + m_proxy_authentication = (char *) xstrdup (auth); +} + +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(m_idletime); + new_proxy->set_proxy_target(m_proxyTarget); + new_proxy->set_APDU_log(get_APDU_log()); + new_proxy->set_proxy_authentication(m_proxy_authentication); + yaz_log (LOG_LOG, "New session p=%p", new_proxy); return new_proxy; } @@ -108,47 +105,159 @@ 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) + + const char *proxy_host = get_proxy(oi); + if (proxy_host) + set_proxy_target(proxy_host); + + // no target specified at all? + if (!m_proxyTarget) + return 0; + + if (!strcmp(m_proxyTarget, "stop")) + exit (0); + if (cookie && *cookie) { + Yaz_ProxyClient *cc = 0; + 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)) + if (!strcmp(cookie,c->m_cookie) && + !strcmp(m_proxyTarget, c->get_hostname())) { - logf (LOG_LOG, "Yaz_Proxy::get_client cached"); - return c; + 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; + + c->m_last_ok = 0; + c->m_last_resultCount = 0; + c->m_sr_transform = 0; + c->m_waiting = 0; + c->timeout(m_idletime); + } + 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_DEBUG, "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) + { + yaz_log (LOG_LOG, "no first INIT!"); + return 0; + } + Z_InitRequest *initRequest = apdu->u.initRequest; - if (apdu->which == Z_APDU_initRequest) + if (!initRequest->idAuthentication) + { + if (m_proxy_authentication) + { + initRequest->idAuthentication = + (Z_IdAuthentication *) + odr_malloc (odr_encode(), + sizeof(*initRequest->idAuthentication)); + initRequest->idAuthentication->which = + Z_IdAuthentication_open; + initRequest->idAuthentication->u.open = + odr_strdup (odr_encode(), m_proxy_authentication); + } + } + + // 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; + yaz_log (LOG_LOG, "Existing sessions"); + for (c = parent->m_clientPool; c; c = c->m_next) + { + yaz_log (LOG_LOG, " Session %-3d wait=%d %s", c->m_seqno, + c->m_waiting, c->get_hostname()); + 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) { - logf (LOG_LOG, "got InitRequest"); - - char *proxy_host = get_proxy(&apdu->u.initRequest->otherInfo); - if (proxy_host) - c->client(proxy_host); + c = c_min; + if (c->m_waiting || strcmp(m_proxyTarget, c->get_hostname())) + { + yaz_log (LOG_LOG, "Replace 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, "Reuse 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_DEBUG, "get_client 2 %p %p", this, c); + return c; + } } - c->timeout(600); + else + { + yaz_log (LOG_LOG, "Making session %d %s", parent->m_seqno, + m_proxyTarget); + 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; + } + if (cookie) + strcpy (c->m_cookie, cookie); + else + c->m_cookie[0] = '\0'; + yaz_log (LOG_LOG, "Connecting to %s", m_proxyTarget); + c->m_seqno = parent->m_seqno; + c->client(m_proxyTarget); + c->m_init_flag = 0; + c->m_last_resultCount = 0; + c->m_last_ok = 0; + c->m_sr_transform = 0; + c->m_waiting = 0; + c->timeout(20); + + (parent->m_seqno)++; } + yaz_log (LOG_DEBUG, "get_client 3 %p %p", this, c); return c; } @@ -156,19 +265,29 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) { if (apdu->which != Z_APDU_searchRequest) return apdu; + if (*m_parent->m_optimize != '1') + return apdu; Z_SearchRequest *sr = apdu->u.searchRequest; Yaz_Z_Query *this_query = new Yaz_Z_Query; + Yaz_Z_Databases this_databases; + + this_databases.set(sr->num_databaseNames, (const char **) + sr->databaseNames); this_query->set_Z_Query(sr->query); - if (m_client->m_last_query && - m_client->m_last_query->match(this_query)) + if (m_client->m_last_ok && m_client->m_last_query && + m_client->m_last_query->match(this_query) && + !strcmp(m_client->m_last_resultSetId, sr->resultSetName) && + m_client->m_last_databases.match(this_databases)) { delete this_query; if (m_client->m_last_resultCount > *sr->smallSetUpperBound && m_client->m_last_resultCount < *sr->largeSetLowerBound) { // medium Set + // send present request (medium size) + yaz_log (LOG_LOG, "Optimizing search for medium set"); Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest); Z_PresentRequest *pr = new_apdu->u.presentRequest; pr->referenceId = sr->referenceId; @@ -186,9 +305,10 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) return new_apdu; } else if (m_client->m_last_resultCount >= *sr->largeSetLowerBound || - m_client->m_last_resultCount == 0) + m_client->m_last_resultCount <= 0) { - // large set + // large set. Return pseudo-search response immediately + yaz_log (LOG_LOG, "Optimizing search for 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 +319,8 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) else { // small set + // send a present request (small set) + yaz_log (LOG_LOG, "Optimizing search for small set"); Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest); Z_PresentRequest *pr = new_apdu->u.presentRequest; pr->referenceId = sr->referenceId; @@ -218,16 +340,42 @@ Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu) } else { - logf (LOG_LOG, "query doesn't match"); delete m_client->m_last_query; m_client->m_last_query = this_query; + m_client->m_last_ok = 0; + + xfree (m_client->m_last_resultSetId); + m_client->m_last_resultSetId = xstrdup (sr->resultSetName); + + m_client->m_last_databases.set(sr->num_databaseNames, + (const char **) sr->databaseNames); } return apdu; } +static const char *apdu_name(Z_APDU *apdu) +{ + switch (apdu->which) + { + case Z_APDU_initRequest: + return "initRequest"; + case Z_APDU_initResponse: + return "initResponse"; + case Z_APDU_searchRequest: + return "searchRequest"; + case Z_APDU_searchResponse: + return "searchResponse"; + case Z_APDU_presentRequest: + return "presentRequest"; + case Z_APDU_presentResponse: + return "presentResponse"; + } + return "other"; +} + void Yaz_Proxy::recv_Z_PDU(Z_APDU *apdu) { - logf (LOG_LOG, "Yaz_Proxy::recv_Z_PDU"); + yaz_log (LOG_LOG, "Receiving %s from client", apdu_name(apdu)); // Determine our client. m_client = get_client(apdu); if (!m_client) @@ -237,17 +385,12 @@ 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) { - Z_APDU *apdu = create_Z_PDU(Z_APDU_initResponse); + Z_APDU *apdu = m_client->m_initResponse; + apdu->u.initResponse->otherInfo = 0; if (m_client->m_cookie) set_otherInformationString(apdu, VAL_COOKIE, 1, m_client->m_cookie); @@ -260,39 +403,87 @@ void Yaz_Proxy::recv_Z_PDU(Z_APDU *apdu) if (!apdu) return; - logf (LOG_LOG, "Yaz_ProxyClient::send_Z_PDU"); + yaz_log (LOG_LOG, "Sending %s to %s", + apdu_name(apdu), 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) + // 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 (client to proxy) keepalive %s", + m_client->get_hostname()); + assert (m_client->m_waiting != 2); // 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, "shutdown (client to proxy) close %s", + m_client->get_hostname()); + assert (m_client->m_waiting != 2); delete m_client; } + else if (!m_parent) + { + yaz_log (LOG_LOG, "shutdown (client to proxy) bad state"); + assert (m_parent); + } + else + { + yaz_log (LOG_LOG, "shutdown (client to proxy)"); + } 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, "Yaz_Proxy 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, "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 +491,25 @@ 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. + odr_destroy(m_init_odr); delete m_last_query; + xfree (m_last_resultSetId); } 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) : @@ -326,15 +520,49 @@ Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable) : m_prev = 0; m_init_flag = 0; m_last_query = 0; + m_last_resultSetId = 0; m_last_resultCount = 0; + m_last_ok = 0; m_sr_transform = 0; + m_waiting = 0; + m_init_odr = odr_createmem (ODR_DECODE); + m_initResponse = 0; +} + +const char *Yaz_Proxy::option(const char *name, const char *value) +{ + if (!strcmp (name, "optimize")) { + if (value) { + xfree (m_optimize); + m_optimize = xstrdup (value); + } + return m_optimize; + } + return 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, "Receiving %s from %s", apdu_name(apdu), + get_hostname()); + if (apdu->which == Z_APDU_initResponse) + { + NMEM nmem = odr_extract_mem (odr_decode()); + odr_reset (m_init_odr); + nmem_transfer (m_init_odr->mem, nmem); + m_initResponse = apdu; + nmem_destroy (nmem); + } 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)) + m_last_ok = 1; + } if (apdu->which == Z_APDU_presentResponse && m_sr_transform) { m_sr_transform = 0; @@ -348,11 +576,11 @@ void Yaz_ProxyClient::recv_Z_PDU(Z_APDU *apdu) sr->numberOfRecordsReturned = pr->numberOfRecordsReturned; apdu = new_apdu; } - if (m_cookie) + if (m_cookie && *m_cookie) set_otherInformationString (apdu, VAL_COOKIE, 1, m_cookie); if (m_server) { - logf (LOG_LOG, "Yaz_Proxy::send_Z_PDU"); + yaz_log (LOG_LOG, "Sending %s to client", apdu_name(apdu)); m_server->send_Z_PDU(apdu); } }