2 * BabelTrace - LTTng live Output
4 * Copyright 2013 Julien Desfossez <jdesfossez@efficios.com>
5 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26 #include <babeltrace/ctf-text/types.h>
27 #include <babeltrace/format.h>
28 #include <babeltrace/babeltrace-internal.h>
32 #include <sys/types.h>
40 #include "lttng-live.h"
42 static volatile int should_quit
;
44 int lttng_live_should_quit(void)
50 void sighandler(int sig
)
63 * TODO: Eventually, this signal handler setup should be done at the
64 * plugin manager level, rather than within this plugin. Beware, we are
65 * not cleaning up the signal handler after plugin execution.
68 int setup_sighandler(void)
74 if ((ret
= sigemptyset(&sigset
)) < 0) {
75 perror("sigemptyset");
78 sa
.sa_handler
= sighandler
;
81 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
85 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
93 * hostname parameter needs to hold NAME_MAX chars.
96 int parse_url(const char *path
, struct lttng_live_ctx
*ctx
)
98 char remain
[3][NAME_MAX
];
99 int ret
= -1, proto
, proto_offset
= 0;
100 size_t path_len
= strlen(path
); /* not accounting \0 */
103 * Since sscanf API does not allow easily checking string length
104 * against a size defined by a macro. Test it beforehand on the
105 * input. We know the output is always <= than the input length.
107 if (path_len
>= NAME_MAX
) {
110 ret
= sscanf(path
, "net%d://", &proto
);
114 proto_offset
= strlen("net://");
116 /* net4:// or net6:// */
117 proto_offset
= strlen("netX://");
119 if (proto_offset
> path_len
) {
122 /* TODO : parse for IPv6 as well */
123 /* Parse the hostname or IP */
124 ret
= sscanf(&path
[proto_offset
], "%[a-zA-Z.0-9%-]%s",
125 ctx
->relay_hostname
, remain
[0]);
127 /* Optional port number */
128 switch (remain
[0][0]) {
130 ret
= sscanf(remain
[0], ":%d%s", &ctx
->port
, remain
[1]);
131 /* Optional session ID with port number */
133 ret
= sscanf(remain
[1], "/%s", remain
[2]);
134 /* Accept 0 or 1 (optional) */
138 } else if (ret
== 0) {
139 fprintf(stderr
, "[error] Missing port number after delimitor ':'\n");
145 /* Optional session ID */
146 ret
= sscanf(remain
[0], "/%s", remain
[2]);
147 /* Accept 0 or 1 (optional) */
153 fprintf(stderr
, "[error] wrong delimitor : %c\n",
161 ctx
->port
= LTTNG_DEFAULT_NETWORK_VIEWER_PORT
;
164 if (strlen(remain
[2]) == 0) {
165 printf_verbose("Connecting to hostname : %s, port : %d, "
167 ctx
->relay_hostname
, ctx
->port
, proto
);
171 ret
= sscanf(remain
[2], "host/%[a-zA-Z.0-9%-]/%s",
172 ctx
->traced_hostname
, ctx
->session_name
);
174 fprintf(stderr
, "[error] Format : "
175 "net://<hostname>/host/<traced_hostname>/<session_name>\n");
179 printf_verbose("Connecting to hostname : %s, port : %d, "
180 "traced hostname : %s, session name : %s, "
182 ctx
->relay_hostname
, ctx
->port
, ctx
->traced_hostname
,
183 ctx
->session_name
, proto
);
190 static int lttng_live_open_trace_read(const char *path
)
193 struct lttng_live_ctx
*ctx
;
195 ctx
= g_new0(struct lttng_live_ctx
, 1);
196 ctx
->session
= g_new0(struct lttng_live_session
, 1);
198 /* We need a pointer to the context from the packet_seek function. */
199 ctx
->session
->ctx
= ctx
;
201 /* HT to store the CTF traces. */
202 ctx
->session
->ctf_traces
= g_hash_table_new(g_direct_hash
,
205 ctx
->session_ids
= g_array_new(FALSE
, TRUE
, sizeof(uint64_t));
207 ret
= parse_url(path
, ctx
);
211 ret
= setup_sighandler();
215 ret
= lttng_live_connect_viewer(ctx
);
219 printf_verbose("LTTng-live connected to relayd\n");
221 ret
= lttng_live_establish_connection(ctx
);
226 printf_verbose("Listing sessions\n");
227 ret
= lttng_live_list_sessions(ctx
, path
);
232 if (ctx
->session_ids
->len
> 0) {
233 ret
= lttng_live_read(ctx
);
237 g_hash_table_destroy(ctx
->session
->ctf_traces
);
238 g_free(ctx
->session
);
239 g_free(ctx
->session
->streams
);
242 if (lttng_live_should_quit()) {
249 struct bt_trace_descriptor
*lttng_live_open_trace(const char *path
, int flags
,
250 void (*packet_seek
)(struct bt_stream_pos
*pos
, size_t index
,
251 int whence
), FILE *metadata_fp
)
253 struct ctf_text_stream_pos
*pos
;
255 switch (flags
& O_ACCMODE
) {
260 fprintf(stderr
, "[error] lttng live plugin cannot be used as output plugin.\n");
263 fprintf(stderr
, "[error] Incorrect open flags.\n");
267 pos
= g_new0(struct ctf_text_stream_pos
, 1);
268 pos
->parent
.rw_table
= NULL
;
269 pos
->parent
.event_cb
= NULL
;
270 pos
->parent
.trace
= &pos
->trace_descriptor
;
271 if (lttng_live_open_trace_read(path
) < 0) {
274 return &pos
->trace_descriptor
;
281 int lttng_live_close_trace(struct bt_trace_descriptor
*td
)
283 struct ctf_text_stream_pos
*pos
=
284 container_of(td
, struct ctf_text_stream_pos
,
291 struct bt_format lttng_live_format
= {
292 .open_trace
= lttng_live_open_trace
,
293 .close_trace
= lttng_live_close_trace
,
297 void __attribute__((constructor
)) lttng_live_init(void)
301 lttng_live_format
.name
= g_quark_from_static_string("lttng-live");
302 ret
= bt_register_format(<tng_live_format
);
307 void __attribute__((destructor
)) lttng_live_exit(void)
309 bt_unregister_format(<tng_live_format
);