134f3ad3d3
Approved by: re (kensmith), brooks (mentor)
538 lines
16 KiB
C
538 lines
16 KiB
C
/*-
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* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/event.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "cachelib.h"
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#include "config.h"
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#include "debug.h"
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#include "log.h"
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#include "query.h"
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#include "mp_rs_query.h"
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#include "mp_ws_query.h"
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#include "singletons.h"
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static int on_mp_read_session_close_notification(struct query_state *);
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static void on_mp_read_session_destroy(struct query_state *);
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static int on_mp_read_session_mapper(struct query_state *);
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/* int on_mp_read_session_request_read1(struct query_state *); */
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static int on_mp_read_session_request_read2(struct query_state *);
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static int on_mp_read_session_request_process(struct query_state *);
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static int on_mp_read_session_response_write1(struct query_state *);
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static int on_mp_read_session_read_request_process(struct query_state *);
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static int on_mp_read_session_read_response_write1(struct query_state *);
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static int on_mp_read_session_read_response_write2(struct query_state *);
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/*
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* This function is used as the query_state's destroy_func to make the
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* proper cleanup in case of errors.
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*/
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static void
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on_mp_read_session_destroy(struct query_state *qstate)
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{
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TRACE_IN(on_mp_read_session_destroy);
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finalize_comm_element(&qstate->request);
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finalize_comm_element(&qstate->response);
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if (qstate->mdata != NULL) {
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configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
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close_cache_mp_read_session(
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(cache_mp_read_session)qstate->mdata);
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configuration_unlock_entry(qstate->config_entry,
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CELT_MULTIPART);
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}
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TRACE_OUT(on_mp_read_session_destroy);
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}
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/*
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* The functions below are used to process multipart read session initiation
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* requests.
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* - on_mp_read_session_request_read1 and on_mp_read_session_request_read2 read
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* the request itself
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* - on_mp_read_session_request_process processes it
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* - on_mp_read_session_response_write1 sends the response
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*/
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int
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on_mp_read_session_request_read1(struct query_state *qstate)
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{
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struct cache_mp_read_session_request *c_mp_rs_request;
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ssize_t result;
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TRACE_IN(on_mp_read_session_request_read1);
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if (qstate->kevent_watermark == 0)
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qstate->kevent_watermark = sizeof(size_t);
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else {
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init_comm_element(&qstate->request,
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CET_MP_READ_SESSION_REQUEST);
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c_mp_rs_request = get_cache_mp_read_session_request(
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&qstate->request);
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result = qstate->read_func(qstate,
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&c_mp_rs_request->entry_length, sizeof(size_t));
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if (result != sizeof(size_t)) {
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TRACE_OUT(on_mp_read_session_request_read1);
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return (-1);
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}
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if (BUFSIZE_INVALID(c_mp_rs_request->entry_length)) {
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TRACE_OUT(on_mp_read_session_request_read1);
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return (-1);
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}
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c_mp_rs_request->entry = (char *)malloc(
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c_mp_rs_request->entry_length + 1);
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assert(c_mp_rs_request->entry != NULL);
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memset(c_mp_rs_request->entry, 0,
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c_mp_rs_request->entry_length + 1);
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qstate->kevent_watermark = c_mp_rs_request->entry_length;
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qstate->process_func = on_mp_read_session_request_read2;
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}
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TRACE_OUT(on_mp_read_session_request_read1);
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return (0);
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}
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static int
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on_mp_read_session_request_read2(struct query_state *qstate)
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{
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struct cache_mp_read_session_request *c_mp_rs_request;
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ssize_t result;
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TRACE_IN(on_mp_read_session_request_read2);
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c_mp_rs_request = get_cache_mp_read_session_request(&qstate->request);
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result = qstate->read_func(qstate, c_mp_rs_request->entry,
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c_mp_rs_request->entry_length);
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if (result != qstate->kevent_watermark) {
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LOG_ERR_3("on_mp_read_session_request_read2",
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"read failed");
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TRACE_OUT(on_mp_read_session_request_read2);
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return (-1);
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}
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qstate->kevent_watermark = 0;
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qstate->process_func = on_mp_read_session_request_process;
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TRACE_OUT(on_mp_read_session_request_read2);
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return (0);
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}
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static int
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on_mp_read_session_request_process(struct query_state *qstate)
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{
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struct cache_mp_read_session_request *c_mp_rs_request;
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struct cache_mp_read_session_response *c_mp_rs_response;
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cache_mp_read_session rs;
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cache_entry c_entry;
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char *dec_cache_entry_name;
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char *buffer;
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size_t buffer_size;
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cache_mp_write_session ws;
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struct agent *lookup_agent;
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struct multipart_agent *mp_agent;
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void *mdata;
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int res;
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TRACE_IN(on_mp_read_session_request_process);
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init_comm_element(&qstate->response, CET_MP_READ_SESSION_RESPONSE);
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c_mp_rs_response = get_cache_mp_read_session_response(
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&qstate->response);
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c_mp_rs_request = get_cache_mp_read_session_request(&qstate->request);
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qstate->config_entry = configuration_find_entry(
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s_configuration, c_mp_rs_request->entry);
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if (qstate->config_entry == NULL) {
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c_mp_rs_response->error_code = ENOENT;
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LOG_ERR_2("read_session_request",
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"can't find configuration entry '%s'."
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" aborting request", c_mp_rs_request->entry);
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goto fin;
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}
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if (qstate->config_entry->enabled == 0) {
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c_mp_rs_response->error_code = EACCES;
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LOG_ERR_2("read_session_request",
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"configuration entry '%s' is disabled",
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c_mp_rs_request->entry);
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goto fin;
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}
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if (qstate->config_entry->perform_actual_lookups != 0)
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dec_cache_entry_name = strdup(
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qstate->config_entry->mp_cache_params.entry_name);
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else {
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#ifdef NS_NSCD_EID_CHECKING
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if (check_query_eids(qstate) != 0) {
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c_mp_rs_response->error_code = EPERM;
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goto fin;
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}
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#endif
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asprintf(&dec_cache_entry_name, "%s%s", qstate->eid_str,
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qstate->config_entry->mp_cache_params.entry_name);
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}
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assert(dec_cache_entry_name != NULL);
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configuration_lock_rdlock(s_configuration);
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c_entry = find_cache_entry(s_cache, dec_cache_entry_name);
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configuration_unlock(s_configuration);
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if ((c_entry == INVALID_CACHE) &&
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(qstate->config_entry->perform_actual_lookups != 0))
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c_entry = register_new_mp_cache_entry(qstate,
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dec_cache_entry_name);
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free(dec_cache_entry_name);
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if (c_entry != INVALID_CACHE_ENTRY) {
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configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
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rs = open_cache_mp_read_session(c_entry);
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configuration_unlock_entry(qstate->config_entry,
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CELT_MULTIPART);
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if ((rs == INVALID_CACHE_MP_READ_SESSION) &&
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(qstate->config_entry->perform_actual_lookups != 0)) {
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lookup_agent = find_agent(s_agent_table,
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c_mp_rs_request->entry, MULTIPART_AGENT);
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if ((lookup_agent != NULL) &&
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(lookup_agent->type == MULTIPART_AGENT)) {
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mp_agent = (struct multipart_agent *)
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lookup_agent;
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mdata = mp_agent->mp_init_func();
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/*
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* Multipart agents read the whole snapshot
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* of the data at one time.
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*/
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configuration_lock_entry(qstate->config_entry,
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CELT_MULTIPART);
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ws = open_cache_mp_write_session(c_entry);
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configuration_unlock_entry(qstate->config_entry,
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CELT_MULTIPART);
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if (ws != NULL) {
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do {
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buffer = NULL;
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res = mp_agent->mp_lookup_func(&buffer,
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&buffer_size,
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mdata);
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if ((res & NS_TERMINATE) &&
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(buffer != NULL)) {
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configuration_lock_entry(
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qstate->config_entry,
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CELT_MULTIPART);
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if (cache_mp_write(ws, buffer,
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buffer_size) != 0) {
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abandon_cache_mp_write_session(ws);
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ws = NULL;
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}
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configuration_unlock_entry(
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qstate->config_entry,
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CELT_MULTIPART);
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free(buffer);
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buffer = NULL;
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} else {
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configuration_lock_entry(
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qstate->config_entry,
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CELT_MULTIPART);
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close_cache_mp_write_session(ws);
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configuration_unlock_entry(
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qstate->config_entry,
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CELT_MULTIPART);
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free(buffer);
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buffer = NULL;
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}
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} while ((res & NS_TERMINATE) &&
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(ws != NULL));
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}
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configuration_lock_entry(qstate->config_entry,
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CELT_MULTIPART);
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rs = open_cache_mp_read_session(c_entry);
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configuration_unlock_entry(qstate->config_entry,
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CELT_MULTIPART);
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}
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}
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if (rs == INVALID_CACHE_MP_READ_SESSION)
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c_mp_rs_response->error_code = -1;
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else {
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qstate->mdata = rs;
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qstate->destroy_func = on_mp_read_session_destroy;
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configuration_lock_entry(qstate->config_entry,
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CELT_MULTIPART);
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if ((qstate->config_entry->mp_query_timeout.tv_sec != 0) ||
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(qstate->config_entry->mp_query_timeout.tv_usec != 0))
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memcpy(&qstate->timeout,
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&qstate->config_entry->mp_query_timeout,
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sizeof(struct timeval));
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configuration_unlock_entry(qstate->config_entry,
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CELT_MULTIPART);
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}
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} else
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c_mp_rs_response->error_code = -1;
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fin:
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qstate->process_func = on_mp_read_session_response_write1;
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qstate->kevent_watermark = sizeof(int);
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qstate->kevent_filter = EVFILT_WRITE;
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TRACE_OUT(on_mp_read_session_request_process);
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return (0);
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}
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static int
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on_mp_read_session_response_write1(struct query_state *qstate)
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{
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struct cache_mp_read_session_response *c_mp_rs_response;
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ssize_t result;
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TRACE_IN(on_mp_read_session_response_write1);
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c_mp_rs_response = get_cache_mp_read_session_response(
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&qstate->response);
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result = qstate->write_func(qstate, &c_mp_rs_response->error_code,
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sizeof(int));
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if (result != sizeof(int)) {
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LOG_ERR_3("on_mp_read_session_response_write1",
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"write failed");
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TRACE_OUT(on_mp_read_session_response_write1);
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return (-1);
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}
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if (c_mp_rs_response->error_code == 0) {
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qstate->kevent_watermark = sizeof(int);
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qstate->process_func = on_mp_read_session_mapper;
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qstate->kevent_filter = EVFILT_READ;
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} else {
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qstate->kevent_watermark = 0;
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qstate->process_func = NULL;
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}
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TRACE_OUT(on_mp_read_session_response_write1);
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return (0);
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}
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/*
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* Mapper function is used to avoid multiple connections for each session
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* write or read requests. After processing the request, it does not close
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* the connection, but waits for the next request.
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*/
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static int
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on_mp_read_session_mapper(struct query_state *qstate)
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{
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ssize_t result;
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int elem_type;
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TRACE_IN(on_mp_read_session_mapper);
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if (qstate->kevent_watermark == 0) {
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qstate->kevent_watermark = sizeof(int);
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} else {
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result = qstate->read_func(qstate, &elem_type, sizeof(int));
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if (result != sizeof(int)) {
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LOG_ERR_3("on_mp_read_session_mapper",
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"read failed");
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TRACE_OUT(on_mp_read_session_mapper);
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return (-1);
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}
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switch (elem_type) {
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case CET_MP_READ_SESSION_READ_REQUEST:
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qstate->kevent_watermark = 0;
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qstate->process_func =
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on_mp_read_session_read_request_process;
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break;
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case CET_MP_READ_SESSION_CLOSE_NOTIFICATION:
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qstate->kevent_watermark = 0;
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qstate->process_func =
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on_mp_read_session_close_notification;
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break;
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default:
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qstate->kevent_watermark = 0;
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qstate->process_func = NULL;
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LOG_ERR_3("on_mp_read_session_mapper",
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"unknown element type");
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TRACE_OUT(on_mp_read_session_mapper);
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return (-1);
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}
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}
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TRACE_OUT(on_mp_read_session_mapper);
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return (0);
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}
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/*
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* The functions below are used to process multipart read sessions read
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* requests. User doesn't have to pass any kind of data, besides the
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* request identificator itself. So we don't need any XXX_read functions and
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* start with the XXX_process function.
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* - on_mp_read_session_read_request_process processes it
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* - on_mp_read_session_read_response_write1 and
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* on_mp_read_session_read_response_write2 sends the response
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*/
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static int
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on_mp_read_session_read_request_process(struct query_state *qstate)
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{
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struct cache_mp_read_session_read_response *read_response;
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TRACE_IN(on_mp_read_session_response_process);
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init_comm_element(&qstate->response, CET_MP_READ_SESSION_READ_RESPONSE);
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read_response = get_cache_mp_read_session_read_response(
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&qstate->response);
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configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
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read_response->error_code = cache_mp_read(
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(cache_mp_read_session)qstate->mdata, NULL,
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&read_response->data_size);
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if (read_response->error_code == 0) {
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read_response->data = (char *)malloc(read_response->data_size);
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assert(read_response != NULL);
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read_response->error_code = cache_mp_read(
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(cache_mp_read_session)qstate->mdata,
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read_response->data,
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&read_response->data_size);
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}
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configuration_unlock_entry(qstate->config_entry, CELT_MULTIPART);
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if (read_response->error_code == 0)
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qstate->kevent_watermark = sizeof(size_t) + sizeof(int);
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else
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qstate->kevent_watermark = sizeof(int);
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qstate->process_func = on_mp_read_session_read_response_write1;
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qstate->kevent_filter = EVFILT_WRITE;
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TRACE_OUT(on_mp_read_session_response_process);
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return (0);
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}
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static int
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on_mp_read_session_read_response_write1(struct query_state *qstate)
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{
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struct cache_mp_read_session_read_response *read_response;
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ssize_t result;
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TRACE_IN(on_mp_read_session_read_response_write1);
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read_response = get_cache_mp_read_session_read_response(
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&qstate->response);
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result = qstate->write_func(qstate, &read_response->error_code,
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sizeof(int));
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if (read_response->error_code == 0) {
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result += qstate->write_func(qstate, &read_response->data_size,
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sizeof(size_t));
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if (result != qstate->kevent_watermark) {
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TRACE_OUT(on_mp_read_session_read_response_write1);
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LOG_ERR_3("on_mp_read_session_read_response_write1",
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"write failed");
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return (-1);
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}
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qstate->kevent_watermark = read_response->data_size;
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qstate->process_func = on_mp_read_session_read_response_write2;
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} else {
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if (result != qstate->kevent_watermark) {
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LOG_ERR_3("on_mp_read_session_read_response_write1",
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"write failed");
|
|
TRACE_OUT(on_mp_read_session_read_response_write1);
|
|
return (-1);
|
|
}
|
|
|
|
qstate->kevent_watermark = 0;
|
|
qstate->process_func = NULL;
|
|
}
|
|
|
|
TRACE_OUT(on_mp_read_session_read_response_write1);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
on_mp_read_session_read_response_write2(struct query_state *qstate)
|
|
{
|
|
struct cache_mp_read_session_read_response *read_response;
|
|
ssize_t result;
|
|
|
|
TRACE_IN(on_mp_read_session_read_response_write2);
|
|
read_response = get_cache_mp_read_session_read_response(
|
|
&qstate->response);
|
|
result = qstate->write_func(qstate, read_response->data,
|
|
read_response->data_size);
|
|
if (result != qstate->kevent_watermark) {
|
|
LOG_ERR_3("on_mp_read_session_read_response_write2",
|
|
"write failed");
|
|
TRACE_OUT(on_mp_read_session_read_response_write2);
|
|
return (-1);
|
|
}
|
|
|
|
finalize_comm_element(&qstate->request);
|
|
finalize_comm_element(&qstate->response);
|
|
|
|
qstate->kevent_watermark = sizeof(int);
|
|
qstate->process_func = on_mp_read_session_mapper;
|
|
qstate->kevent_filter = EVFILT_READ;
|
|
|
|
TRACE_OUT(on_mp_read_session_read_response_write2);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Handles session close notification by calling close_cache_mp_read_session
|
|
* function.
|
|
*/
|
|
static int
|
|
on_mp_read_session_close_notification(struct query_state *qstate)
|
|
{
|
|
|
|
TRACE_IN(on_mp_read_session_close_notification);
|
|
configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
|
|
close_cache_mp_read_session((cache_mp_read_session)qstate->mdata);
|
|
configuration_unlock_entry(qstate->config_entry, CELT_MULTIPART);
|
|
qstate->mdata = NULL;
|
|
qstate->kevent_watermark = 0;
|
|
qstate->process_func = NULL;
|
|
TRACE_OUT(on_mp_read_session_close_notification);
|
|
return (0);
|
|
}
|