2 * SPDX-License-Identifier: MIT
4 * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
5 * Copyright 2016 Philippe Proulx <pproulx@efficios.com>
6 * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
7 * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
10 #define BT_COMP_LOG_SELF_COMP self_comp
11 #define BT_LOG_OUTPUT_LEVEL log_level
12 #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/DS"
13 #include "logging/comp-logging.h"
21 #include <babeltrace2/babeltrace.h>
23 #include "../common/msg-iter/msg-iter.h"
24 #include "common/assert.h"
25 #include "compat/mman.h"
26 #include "data-stream.h"
28 #define STREAM_NAME_PREFIX "stream-"
31 enum ctf_msg_iter_medium_status
medop_request_bytes(
32 size_t request_sz
, uint8_t **buffer_addr
,
33 size_t *buffer_sz
, void *data
)
35 enum ctf_msg_iter_medium_status status
=
36 CTF_MSG_ITER_MEDIUM_STATUS_OK
;
37 struct lttng_live_stream_iterator
*stream
= data
;
38 struct lttng_live_trace
*trace
= stream
->trace
;
39 struct lttng_live_session
*session
= trace
->session
;
40 struct lttng_live_msg_iter
*live_msg_iter
= session
->lttng_live_msg_iter
;
41 uint64_t recv_len
= 0;
45 BT_ASSERT(request_sz
);
47 if (stream
->has_stream_hung_up
) {
48 status
= CTF_MSG_ITER_MEDIUM_STATUS_EOF
;
52 len_left
= stream
->base_offset
+ stream
->len
- stream
->offset
;
54 lttng_live_stream_iterator_set_state(stream
,
55 LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
);
56 status
= CTF_MSG_ITER_MEDIUM_STATUS_AGAIN
;
60 read_len
= MIN(request_sz
, stream
->buflen
);
61 read_len
= MIN(read_len
, len_left
);
62 status
= lttng_live_get_stream_bytes(live_msg_iter
,
63 stream
, stream
->buf
, stream
->offset
,
65 *buffer_addr
= stream
->buf
;
66 *buffer_sz
= recv_len
;
67 stream
->offset
+= recv_len
;
73 bt_stream
*medop_borrow_stream(bt_stream_class
*stream_class
,
74 int64_t stream_id
, void *data
)
76 struct lttng_live_stream_iterator
*lttng_live_stream
= data
;
77 bt_logging_level log_level
= lttng_live_stream
->log_level
;
78 bt_self_component
*self_comp
= lttng_live_stream
->self_comp
;
80 if (!lttng_live_stream
->stream
) {
81 uint64_t stream_class_id
= bt_stream_class_get_id(stream_class
);
83 BT_COMP_LOGI("Creating stream %s (ID: %" PRIu64
") out of stream "
84 "class %" PRId64
, lttng_live_stream
->name
->str
,
85 stream_id
, stream_class_id
);
89 * No stream instance ID in the stream. It's possible
90 * to encounter this situation with older version of
91 * LTTng. In these cases, use the viewer_stream_id that
92 * is unique for a live viewer session.
94 lttng_live_stream
->stream
= bt_stream_create_with_id(
95 stream_class
, lttng_live_stream
->trace
->trace
,
96 lttng_live_stream
->viewer_stream_id
);
98 lttng_live_stream
->stream
= bt_stream_create_with_id(
99 stream_class
, lttng_live_stream
->trace
->trace
,
100 (uint64_t) stream_id
);
103 if (!lttng_live_stream
->stream
) {
104 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
105 "Cannot create stream %s (stream class ID "
106 "%" PRId64
", stream ID %" PRIu64
")",
107 lttng_live_stream
->name
->str
,
108 stream_class_id
, stream_id
);
112 bt_stream_set_name(lttng_live_stream
->stream
,
113 lttng_live_stream
->name
->str
);
117 return lttng_live_stream
->stream
;
120 static struct ctf_msg_iter_medium_ops medops
= {
121 .request_bytes
= medop_request_bytes
,
123 .borrow_stream
= medop_borrow_stream
,
127 enum lttng_live_iterator_status
lttng_live_lazy_msg_init(
128 struct lttng_live_session
*session
,
129 bt_self_message_iterator
*self_msg_iter
)
131 struct lttng_live_component
*lttng_live
=
132 session
->lttng_live_msg_iter
->lttng_live_comp
;
133 uint64_t trace_idx
, stream_iter_idx
;
134 bt_logging_level log_level
= session
->log_level
;
135 bt_self_component
*self_comp
= session
->self_comp
;
137 if (!session
->lazy_stream_msg_init
) {
138 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
141 BT_COMP_LOGD("Lazily initializing self message iterator for live session: "
142 "session-id=%"PRIu64
", self-msg-iter-addr=%p", session
->id
,
145 for (trace_idx
= 0; trace_idx
< session
->traces
->len
; trace_idx
++) {
146 struct lttng_live_trace
*trace
=
147 g_ptr_array_index(session
->traces
, trace_idx
);
149 for (stream_iter_idx
= 0;
150 stream_iter_idx
< trace
->stream_iterators
->len
;
152 struct ctf_trace_class
*ctf_tc
;
153 struct lttng_live_stream_iterator
*stream_iter
=
154 g_ptr_array_index(trace
->stream_iterators
,
157 if (stream_iter
->msg_iter
) {
160 ctf_tc
= ctf_metadata_decoder_borrow_ctf_trace_class(
161 trace
->metadata
->decoder
);
162 BT_COMP_LOGD("Creating CTF message iterator: "
163 "session-id=%"PRIu64
", ctf-tc-addr=%p, "
164 "stream-iter-name=%s, self-msg-iter-addr=%p",
165 session
->id
, ctf_tc
, stream_iter
->name
->str
, self_msg_iter
);
166 stream_iter
->msg_iter
= ctf_msg_iter_create(ctf_tc
,
167 lttng_live
->max_query_size
, medops
, stream_iter
,
168 log_level
, self_comp
, self_msg_iter
);
169 if (!stream_iter
->msg_iter
) {
170 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
171 "Failed to create CTF message iterator");
177 session
->lazy_stream_msg_init
= false;
179 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
182 return LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
186 struct lttng_live_stream_iterator
*lttng_live_stream_iterator_create(
187 struct lttng_live_session
*session
,
188 uint64_t ctf_trace_id
,
190 bt_self_message_iterator
*self_msg_iter
)
192 struct lttng_live_stream_iterator
*stream_iter
;
193 struct lttng_live_component
*lttng_live
;
194 struct lttng_live_trace
*trace
;
195 bt_logging_level log_level
;
196 bt_self_component
*self_comp
;
199 BT_ASSERT(session
->lttng_live_msg_iter
);
200 BT_ASSERT(session
->lttng_live_msg_iter
->lttng_live_comp
);
201 log_level
= session
->log_level
;
202 self_comp
= session
->self_comp
;
204 lttng_live
= session
->lttng_live_msg_iter
->lttng_live_comp
;
206 stream_iter
= g_new0(struct lttng_live_stream_iterator
, 1);
208 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
209 "Failed to allocate struct lttng_live_stream_iterator");
213 stream_iter
->log_level
= log_level
;
214 stream_iter
->self_comp
= self_comp
;
215 trace
= lttng_live_session_borrow_or_create_trace_by_id(session
, ctf_trace_id
);
217 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
218 "Failed to borrow CTF trace.");
222 stream_iter
->trace
= trace
;
223 stream_iter
->state
= LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
;
224 stream_iter
->viewer_stream_id
= stream_id
;
225 stream_iter
->ctf_stream_class_id
= -1ULL;
226 stream_iter
->last_inactivity_ts
.is_set
= false;
227 stream_iter
->last_inactivity_ts
.value
= 0;
230 struct ctf_trace_class
*ctf_tc
=
231 ctf_metadata_decoder_borrow_ctf_trace_class(
232 trace
->metadata
->decoder
);
233 BT_ASSERT(!stream_iter
->msg_iter
);
234 stream_iter
->msg_iter
= ctf_msg_iter_create(ctf_tc
,
235 lttng_live
->max_query_size
, medops
, stream_iter
,
236 log_level
, self_comp
, self_msg_iter
);
237 if (!stream_iter
->msg_iter
) {
238 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
239 "Failed to create CTF message iterator");
243 stream_iter
->buf
= g_new0(uint8_t, lttng_live
->max_query_size
);
244 if (!stream_iter
->buf
) {
245 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
246 "Failed to allocate live stream iterator buffer");
250 stream_iter
->buflen
= lttng_live
->max_query_size
;
251 stream_iter
->name
= g_string_new(NULL
);
252 if (!stream_iter
->name
) {
253 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
254 "Failed to allocate live stream iterator name buffer");
258 g_string_printf(stream_iter
->name
, STREAM_NAME_PREFIX
"%" PRIu64
,
259 stream_iter
->viewer_stream_id
);
260 g_ptr_array_add(trace
->stream_iterators
, stream_iter
);
262 /* Track the number of active stream iterator. */
263 session
->lttng_live_msg_iter
->active_stream_iter
++;
267 lttng_live_stream_iterator_destroy(stream_iter
);
274 void lttng_live_stream_iterator_destroy(
275 struct lttng_live_stream_iterator
*stream_iter
)
281 if (stream_iter
->stream
) {
282 BT_STREAM_PUT_REF_AND_RESET(stream_iter
->stream
);
285 if (stream_iter
->msg_iter
) {
286 ctf_msg_iter_destroy(stream_iter
->msg_iter
);
288 g_free(stream_iter
->buf
);
289 if (stream_iter
->name
) {
290 g_string_free(stream_iter
->name
, TRUE
);
293 bt_message_put_ref(stream_iter
->current_msg
);
295 /* Track the number of active stream iterator. */
296 stream_iter
->trace
->session
->lttng_live_msg_iter
->active_stream_iter
--;