added clixon_stream.[ch]
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Olof hagsand
parent
07542269ec
commit
d7fbe75c9e
2 changed files with 314 additions and 0 deletions
73
lib/clixon/clixon_stream.h
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73
lib/clixon/clixon_stream.h
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/*
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*
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***** BEGIN LICENSE BLOCK *****
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Copyright (C) 2009-2018 Olof Hagsand and Benny Holmgren
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This file is part of CLIXON.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 3 or later (the "GPL"),
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in which case the provisions of the GPL are applicable instead
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of those above. If you wish to allow use of your version of this file only
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under the terms of the GPL, and not to allow others to
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use your version of this file under the terms of Apache License version 2,
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indicate your decision by deleting the provisions above and replace them with
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the notice and other provisions required by the GPL. If you do not delete
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the provisions above, a recipient may use your version of this file under
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the terms of any one of the Apache License version 2 or the GPL.
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***** END LICENSE BLOCK *****
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* Event notification streams according to RFC5277
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*/
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#ifndef _CLIXON_STREAM_H_
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#define _CLIXON_STREAM_H_
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/*
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* Types
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*/
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/* subscription callback */
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typedef int (*stream_fn_t)(clicon_handle, void *filter, void *arg);
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typedef stream_fn_t subscription_fn_t;
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struct stream_subscription{
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struct stream_subscription *ss_next;
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char *ss_stream; /* Name of associated stream */
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stream_fn_t ss_fn; /* Callback when event occurs */
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void *ss_arg; /* Callback argument */
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};
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/* See RFC8040 9.3, stream list, no replay support for now
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*/
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struct event_stream{
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struct event_stream *es_next;
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char *es_name; /* name of notification event stream */
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char *es_description;
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struct stream_subscription *es_subscription;
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};
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typedef struct event_stream event_stream_t;
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/*
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* Prototypes
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*/
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event_stream_t *stream_find(clicon_handle h, const char *name);
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int stream_register(clicon_handle h, const char *name, const char *description);
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int stream_free(event_stream_t *es);
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int stream_get_xml(clicon_handle h, int access, cbuf *cb);
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int stream_cb_add(clicon_handle h, char *stream, stream_fn_t fn, void *arg);
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int stream_cb_delete(clicon_handle h, char *stream, stream_fn_t fn);
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#endif /* _CLIXON_STREAM_H_ */
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241
lib/src/clixon_stream.c
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241
lib/src/clixon_stream.c
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/*
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*
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***** BEGIN LICENSE BLOCK *****
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Copyright (C) 2009-2018 Olof Hagsand and Benny Holmgren
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This file is part of CLIXON.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 3 or later (the "GPL"),
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in which case the provisions of the GPL are applicable instead
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of those above. If you wish to allow use of your version of this file only
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under the terms of the GPL, and not to allow others to
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use your version of this file under the terms of Apache License version 2,
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indicate your decision by deleting the provisions above and replace them with
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the notice and other provisions required by the GPL. If you do not delete
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the provisions above, a recipient may use your version of this file under
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the terms of any one of the Apache License version 2 or the GPL.
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***** END LICENSE BLOCK *****
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* Event notification streams according to RFC5277
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* See (old) subscription code in clixon_backend_handle.c and backend_client.c
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*/
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#ifdef HAVE_CONFIG_H
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#include "clixon_config.h" /* generated by config & autoconf */
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <inttypes.h>
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/* cligen */
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#include <cligen/cligen.h>
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/* clicon */
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#include "clixon_queue.h"
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#include "clixon_err.h"
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#include "clixon_hash.h"
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#include "clixon_handle.h"
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#include "clixon_stream.h"
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/*! Find an event notification stream given name
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* @param[in] h Clicon handle
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* @param[in] name Name of stream
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* @retval es Event notification stream structure
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* @retval NULL Not found
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*/
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event_stream_t *
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stream_find(clicon_handle h,
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const char *name)
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{
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event_stream_t *es = NULL;
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for (es=clicon_stream(h); es; es=es->es_next)
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if (strcmp(name, es->es_name)==0)
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break;
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return es;
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}
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/*! Add notification event stream
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*/
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int
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stream_register(clicon_handle h,
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const char *name,
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const char *description)
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{
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int retval = -1;
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event_stream_t *es;
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if ((es = stream_find(h, name)) != NULL)
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goto ok;
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if ((es = malloc(sizeof(event_stream_t))) == NULL){
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clicon_err(OE_XML, errno, "malloc");
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goto done;
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}
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memset(es, 0, sizeof(event_stream_t));
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if ((es->es_name = strdup(name)) == NULL){
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clicon_err(OE_XML, errno, "strdup");
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goto done;
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}
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if ((es->es_description = strdup(description)) == NULL){
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clicon_err(OE_XML, errno, "strdup");
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goto done;
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}
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clicon_stream_append(h, es);
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ok:
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retval = 0;
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done:
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return retval;
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}
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/*! Delete complete notification event stream list
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*/
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int
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stream_free(event_stream_t *es)
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{
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event_stream_t *e_next;
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while (es){
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e_next = es->es_next;
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if (es->es_name)
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free(es->es_name);
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if (es->es_description)
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free(es->es_description);
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free(es);
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es = e_next;
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}
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return 0;
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}
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/*! Return stream definition
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* @param[in] h Clicon handle
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* @param[in] access If set, include access/location
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* @param[out] cb Output buffer containing XML on exit
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* @retval 0 OK
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* @retval -1 Error
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*/
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int
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stream_get_xml(clicon_handle h,
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int access,
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cbuf *cb)
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{
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event_stream_t *es = NULL;
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cprintf(cb, "<streams>");
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for (es=clicon_stream(h); es; es=es->es_next){
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cprintf(cb, "<stream>");
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cprintf(cb, "<name>%s</name>", es->es_name);
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if (es->es_description)
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cprintf(cb, "<description>%s</description>", es->es_description);
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cprintf(cb, "<replay-support>false</replay-support>");
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if (access){
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cprintf(cb, "<access>");
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cprintf(cb, "<encoding>xml</encoding>");
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/* Note /stream need to be in http proxy declaration */
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cprintf(cb, "<location>https://example.com/stream/%s</location>", es->es_name);
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cprintf(cb, "</access>");
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}
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cprintf(cb, "</stream>");
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}
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cprintf(cb, "</streams>");
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return 0;
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}
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#ifdef NYI
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/*! Delete single notification event stream
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* XXX notused
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*/
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int
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stream_del()
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{
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return 0;
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}
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#endif
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/*! Add an event notification callback to a stream given a callback function
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* @param[in] h Clicon handle
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* @param[in] stream Name of stream
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* @param[in] fn Callback when event occurs
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* @param[in] arg Argument to use with callback. Also handle when deleting
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* @retval 0 OK
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* @retval -1 Error
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* XXX: from subscription_add and client_subscription_add
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*/
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int
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stream_cb_add(clicon_handle h,
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char *stream,
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stream_fn_t fn,
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void *arg)
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{
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int retval = -1;
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event_stream_t *es;
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struct stream_subscription *ss;
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if ((es = stream_find(h, stream)) == NULL){
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clicon_err(OE_CFG, ENOENT, "Stream not found");
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goto done;
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}
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if ((ss = malloc(sizeof(*ss))) == NULL){
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clicon_err(OE_CFG, errno, "malloc");
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goto done;
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}
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memset(ss, 0, sizeof(*ss));
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ss->ss_stream = strdup(stream);
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ss->ss_fn = fn;
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ss->ss_arg = arg;
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ss->ss_next = es->es_subscription;
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es->es_subscription = ss;
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retval = 0;
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done:
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return retval;
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}
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/*! Delete event notification callback to a stream given a callback function
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* Alt just send in an ss struct?
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*/
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int
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stream_cb_delete(clicon_handle h,
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char *stream,
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stream_fn_t fn)
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{
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int retval = -1;
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event_stream_t *es;
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struct stream_subscription *ss;
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struct stream_subscription **ss_prev;
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if ((es = stream_find(h, stream)) == NULL)
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goto ok;
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ss_prev = &es->es_subscription;
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for (ss = *ss_prev; ss; ss = ss->ss_next){
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if (ss->ss_fn == fn){
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*ss_prev = ss->ss_next;
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free(ss->ss_stream);
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if (ss->ss_arg)
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free(ss->ss_arg);
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free(ss);
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break;
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}
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ss_prev = &ss->ss_next;
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}
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ok:
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retval = 0;
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return retval;
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}
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