+void yf::Zoom::Frontend::log_diagnostic(mp::Package &package,
+ int error, const char *addinfo)
+{
+ const char *err_msg = yaz_diag_bib1_str(error);
+ if (addinfo)
+ package.log("zoom", YLOG_WARN, "Diagnostic %d %s: %s",
+ error, err_msg, addinfo);
+ else
+ package.log("zoom", YLOG_WARN, "Diagnostic %d %s:",
+ error, err_msg);
+}
+
+yf::Zoom::BackendPtr yf::Zoom::Frontend::explain_search(mp::Package &package,
+ std::string &database,
+ int *error,
+ char **addinfo,
+ mp::odr &odr,
+ std::string &torus_db,
+ std::string &realm)
+{
+ m_backend.reset();
+
+ BackendPtr b(new Backend);
+
+ b->m_frontend_database = database;
+ b->enable_explain = true;
+
+ Z_GDU *gdu = package.request().get();
+ Z_APDU *apdu_req = gdu->u.z3950;
+ Z_SearchRequest *sr = apdu_req->u.searchRequest;
+ Z_Query *query = sr->query;
+
+ if (!m_p->explain_xsp)
+ {
+ *error = YAZ_BIB1_UNSPECIFIED_ERROR;
+ *addinfo =
+ odr_strdup(odr, "IR-Explain---1 unsupported. "
+ "Torus explain_xsl not defined");
+ return m_backend;
+ }
+ else if (query->which == Z_Query_type_104 &&
+ query->u.type_104->which == Z_External_CQL)
+ {
+ std::string torus_url = m_p->torus_searchable_url;
+ std::string torus_query(query->u.type_104->u.cql);
+ xmlDoc *doc = mp::get_searchable(package, torus_url, "",
+ torus_query,
+ realm, m_p->proxy);
+ if (m_p->explain_xsp)
+ {
+ xmlDoc *rec_res = xsltApplyStylesheet(m_p->explain_xsp, doc, 0);
+
+ xmlFreeDoc(doc);
+ doc = rec_res;
+ }
+ if (!doc)
+ {
+ *error = YAZ_BIB1_UNSPECIFIED_ERROR;
+ *addinfo = odr_strdup(odr, "Torus server unavailable or "
+ "incorrectly configured");
+ }
+ else
+ {
+ xmlNode *ptr = xmlDocGetRootElement(doc);
+ int hits = 0;
+
+ xml_node_search(ptr, &hits, 0);
+
+ Z_APDU *apdu_res = odr.create_searchResponse(apdu_req, 0, 0);
+ apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
+ package.response() = apdu_res;
+ m_backend = b;
+ }
+ if (b->explain_doc)
+ xmlFreeDoc(b->explain_doc);
+ b->explain_doc = doc;
+ return m_backend;
+ }
+ else
+ {
+ *error = YAZ_BIB1_QUERY_TYPE_UNSUPP;
+ *addinfo = odr_strdup(odr, "IR-Explain---1 only supports CQL");
+ return m_backend;
+ }
+}
+
+static bool wait_conn(COMSTACK cs, int secs)
+{
+ struct yaz_poll_fd pfd;
+
+ yaz_poll_add(pfd.input_mask, yaz_poll_except);
+ if (cs->io_pending && CS_WANT_WRITE)
+ yaz_poll_add(pfd.input_mask, yaz_poll_write);
+ if (cs->io_pending & CS_WANT_READ)
+ yaz_poll_add(pfd.input_mask, yaz_poll_read);
+
+ pfd.fd = cs_fileno(cs);
+ pfd.client_data = 0;
+
+ int ret = yaz_poll(&pfd, 1, secs, 0);
+ return ret > 0;
+}
+
+bool yf::Zoom::Impl::check_proxy(const char *proxy)
+{
+ COMSTACK conn = 0;
+ const char *uri = "http://localhost/";
+ void *add;
+ mp::odr odr;
+ bool outcome = false;
+ conn = cs_create_host_proxy(uri, 0, &add, proxy);
+
+ if (!conn)
+ return false;
+
+ Z_GDU *gdu = z_get_HTTP_Request_uri(odr, uri, 0, 1);
+ gdu->u.HTTP_Request->method = odr_strdup(odr, "GET");
+
+ if (z_GDU(odr, &gdu, 0, 0))
+ {
+ int len;
+ char *buf = odr_getbuf(odr, &len, 0);
+
+ int ret = cs_connect(conn, add);
+ if (ret > 0 || (ret == 0 && wait_conn(conn, 1)))
+ {
+ while (1)
+ {
+ ret = cs_put(conn, buf, len);
+ if (ret != 1)
+ break;
+ if (!wait_conn(conn, proxy_timeout))
+ break;
+ }
+ if (ret == 0)
+ outcome = true;
+ }
+ }
+ cs_close(conn);
+ return outcome;
+}
+
+bool yf::Zoom::Frontend::retry(mp::Package &package,
+ mp::odr &odr,
+ BackendPtr b,
+ int &error, char **addinfo,
+ int &proxy_step, int &same_retries,
+ int &proxy_retries)
+{
+ if (b && b->m_proxy.length() && !m_p->check_proxy(b->m_proxy.c_str()))
+ {
+ log_diagnostic(package, error, *addinfo);
+ package.log("zoom", YLOG_LOG, "proxy %s fails", b->m_proxy.c_str());
+ m_backend.reset();
+ if (proxy_step) // there is a failover
+ {
+ proxy_retries++;
+ package.log("zoom", YLOG_WARN, "search failed: trying next proxy");
+ return true;
+ }
+ error = YAZ_BIB1_PROXY_FAILURE;
+ *addinfo = odr_strdup(odr, b->m_proxy.c_str());
+ }
+ else if (same_retries == 0 && proxy_retries == 0)
+ {
+ log_diagnostic(package, error, *addinfo);
+ same_retries++;
+ package.log("zoom", YLOG_WARN, "search failed: retry");
+ m_backend.reset();
+ proxy_step = 0;
+ return true;
+ }
+ return false;
+}
+