--- /dev/null
+/* This file is part of Metaproxy.
+ Copyright (C) 2005-2009 Index Data
+
+Metaproxy is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+Metaproxy is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#include "config.hpp"
+#include "filter_limit.hpp"
+
+#include <time.h>
+#include <yaz/log.h>
+#include "package.hpp"
+#include "util.hpp"
+
+namespace mp = metaproxy_1;
+namespace yf = mp::filter;
+
+namespace metaproxy_1 {
+ namespace filter {
+ class Limit::Ses {
+ public:
+ Yaz_bw bw_stat;
+ Yaz_bw pdu_stat;
+ Yaz_bw search_stat;
+ Ses() : bw_stat(60), pdu_stat(60), search_stat(60) {};
+ };
+ class Limit::Impl {
+ public:
+ Impl();
+ ~Impl();
+ void process(metaproxy_1::Package & package);
+ void configure(const xmlNode * ptr);
+ private:
+
+ boost::mutex m_session_mutex;
+ std::map<mp::Session,Limit::Ses *> m_sessions;
+
+ int m_bw_max;
+ int m_pdu_max;
+ int m_search_max;
+ int m_max_record_retrieve;
+ };
+ }
+}
+
+// define Pimpl wrapper forwarding to Impl
+
+yf::Limit::Limit() : m_p(new Impl)
+{
+}
+
+yf::Limit::~Limit()
+{ // must have a destructor because of boost::scoped_ptr
+}
+
+void yf::Limit::configure(const xmlNode *xmlnode, bool test_only)
+{
+ m_p->configure(xmlnode);
+}
+
+void yf::Limit::process(mp::Package &package) const
+{
+ m_p->process(package);
+}
+
+
+// define Implementation stuff
+
+yf::Limit::Impl::Impl() : m_bw_max(0), m_pdu_max(0), m_search_max(0),
+ m_max_record_retrieve(0)
+{
+}
+
+yf::Limit::Impl::~Impl()
+{
+}
+
+void yf::Limit::Impl::configure(const xmlNode *ptr)
+{
+ for (ptr = ptr->children; ptr; ptr = ptr->next)
+ {
+ if (ptr->type != XML_ELEMENT_NODE)
+ continue;
+ if (!strcmp((const char *) ptr->name, "limit"))
+ {
+ const struct _xmlAttr *attr;
+ for (attr = ptr->properties; attr; attr = attr->next)
+ {
+ if (!strcmp((const char *) attr->name, "bandwidth"))
+ m_bw_max = mp::xml::get_int(attr->children, 0);
+ else if (!strcmp((const char *) attr->name, "pdu"))
+ m_pdu_max = mp::xml::get_int(attr->children, 0);
+ else if (!strcmp((const char *) attr->name, "search"))
+ m_search_max = mp::xml::get_int(attr->children, 0);
+ else if (!strcmp((const char *) attr->name, "retrieve"))
+ m_max_record_retrieve =
+ mp::xml::get_int(attr->children, 0);
+ else
+ throw mp::filter::FilterException(
+ "Bad attribute " + std::string((const char *)
+ attr->name));
+ }
+ }
+ else
+ {
+ throw mp::filter::FilterException("Bad element "
+ + std::string((const char *)
+ ptr->name));
+ }
+ }
+}
+
+void yf::Limit::Impl::process(mp::Package &package)
+{
+ package.move();
+ int reduce = 0;
+
+ {
+ boost::mutex::scoped_lock scoped_lock(m_session_mutex);
+
+ yf::Limit::Ses *ses = 0;
+
+ std::map<mp::Session,yf::Limit::Ses *>::iterator it =
+ m_sessions.find(package.session());
+ if (it != m_sessions.end())
+ ses = it->second;
+ else
+ {
+ ses = new yf::Limit::Ses;
+ m_sessions[package.session()] = ses;
+ }
+
+ int sz = package.request().get_size() + package.response().get_size();
+
+ ses->bw_stat.add_bytes(sz);
+ ses->pdu_stat.add_bytes(1);
+
+ Z_GDU *gdu = package.request().get();
+ if (gdu && gdu->which == Z_GDU_Z3950)
+ {
+ // we're getting a Z39.50 package
+ Z_APDU *apdu = gdu->u.z3950;
+ if (apdu->which == Z_APDU_searchRequest)
+ ses->search_stat.add_bytes(1);
+ if (m_max_record_retrieve)
+ {
+ if (apdu->which == Z_APDU_presentRequest)
+ {
+ Z_PresentRequest *pr = apdu->u.presentRequest;
+ if (pr->numberOfRecordsRequested &&
+ *pr->numberOfRecordsRequested > m_max_record_retrieve)
+ *pr->numberOfRecordsRequested = m_max_record_retrieve;
+ }
+ }
+ }
+
+ yaz_log(YLOG_LOG, "sz = %d . total = %d", sz,
+ ses->bw_stat.get_total());
+
+ int bw_total = ses->bw_stat.get_total();
+ int pdu_total = ses->pdu_stat.get_total();
+ int search_total = ses->search_stat.get_total();
+
+ if (m_search_max)
+ reduce += search_total / m_search_max;
+ if (m_bw_max)
+ reduce += (bw_total/m_bw_max);
+ if (m_pdu_max)
+ {
+ if (pdu_total > m_pdu_max)
+ {
+ int nreduce = (m_pdu_max >= 60) ? 1 : 60/m_pdu_max;
+ reduce = (reduce > nreduce) ? reduce : nreduce;
+ }
+ }
+ if (package.session().is_closed())
+ m_sessions.erase(package.session());
+ }
+ if (reduce)
+ {
+ yaz_log(YLOG_LOG, "sleeping %d seconds", reduce);
+ sleep(reduce);
+ }
+}
+
+
+static mp::filter::Base* filter_creator()
+{
+ return new mp::filter::Limit;
+}
+
+extern "C" {
+ struct metaproxy_1_filter_struct metaproxy_1_filter_limit = {
+ 0,
+ "limit",
+ filter_creator
+ };
+}
+
+// bandwidth class (taken from YAZ Proxy)
+
+Yaz_bw::Yaz_bw(int sz)
+{
+ m_sec = 0;
+ m_size = sz;
+ m_bucket = new int[m_size];
+ m_ptr = 0;
+}
+
+Yaz_bw::~Yaz_bw()
+{
+ delete [] m_bucket;
+}
+
+int Yaz_bw::get_total()
+{
+ add_bytes(0);
+ int bw = 0;
+ int i;
+ for (i = 0; i<m_size; i++)
+ bw += m_bucket[i];
+ return bw;
+}
+
+void Yaz_bw::add_bytes(int b)
+{
+ long now = time(0);
+
+ if (now >= m_sec)
+ {
+ int d = now - m_sec;
+ if (d > m_size)
+ d = m_size;
+ while (--d >= 0)
+ {
+ if (++m_ptr == m_size)
+ m_ptr = 0;
+ m_bucket[m_ptr] = 0;
+ }
+ m_bucket[m_ptr] += b;
+ }
+ m_sec = now;
+}
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * c-file-style: "Stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+
projects / metaproxy-moved-to-github.git / blobdiff