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
15 #include <babeltrace2/babeltrace.h>
17 #include "common/assert.h"
18 #include "compat/mman.h" /* IWYU pragma: keep */
19 #include "cpp-common/vendor/fmt/format.h"
21 #include "../common/src/msg-iter/msg-iter.hpp"
22 #include "data-stream.hpp"
24 #define STREAM_NAME_PREFIX "stream-"
26 static enum ctf_msg_iter_medium_status
medop_request_bytes(size_t request_sz
, uint8_t **buffer_addr
,
27 size_t *buffer_sz
, void *data
)
29 enum ctf_msg_iter_medium_status status
= CTF_MSG_ITER_MEDIUM_STATUS_OK
;
30 lttng_live_stream_iterator
*stream
= (lttng_live_stream_iterator
*) data
;
31 struct lttng_live_trace
*trace
= stream
->trace
;
32 struct lttng_live_session
*session
= trace
->session
;
33 struct lttng_live_msg_iter
*live_msg_iter
= session
->lttng_live_msg_iter
;
34 uint64_t recv_len
= 0;
38 BT_ASSERT(request_sz
);
40 if (stream
->has_stream_hung_up
) {
41 status
= CTF_MSG_ITER_MEDIUM_STATUS_EOF
;
45 len_left
= stream
->base_offset
+ stream
->len
- stream
->offset
;
47 lttng_live_stream_iterator_set_state(stream
, LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
);
48 status
= CTF_MSG_ITER_MEDIUM_STATUS_AGAIN
;
52 read_len
= MIN(request_sz
, stream
->buflen
);
53 read_len
= MIN(read_len
, len_left
);
54 status
= lttng_live_get_stream_bytes(live_msg_iter
, stream
, stream
->buf
, stream
->offset
,
56 *buffer_addr
= stream
->buf
;
57 *buffer_sz
= recv_len
;
58 stream
->offset
+= recv_len
;
63 static bt_stream
*medop_borrow_stream(bt_stream_class
*stream_class
, int64_t stream_id
, void *data
)
65 lttng_live_stream_iterator
*lttng_live_stream
= (lttng_live_stream_iterator
*) data
;
67 if (!lttng_live_stream
->stream
) {
68 uint64_t stream_class_id
= bt_stream_class_get_id(stream_class
);
70 BT_CPPLOGI_SPEC(lttng_live_stream
->logger
,
71 "Creating stream {} (ID: {}) out of stream class {}",
72 lttng_live_stream
->name
->str
, stream_id
, stream_class_id
);
76 * No stream instance ID in the stream. It's possible
77 * to encounter this situation with older version of
78 * LTTng. In these cases, use the viewer_stream_id that
79 * is unique for a live viewer session.
81 lttng_live_stream
->stream
=
82 bt_stream_create_with_id(stream_class
, lttng_live_stream
->trace
->trace
->libObjPtr(),
83 lttng_live_stream
->viewer_stream_id
);
85 lttng_live_stream
->stream
= bt_stream_create_with_id(
86 stream_class
, lttng_live_stream
->trace
->trace
->libObjPtr(), (uint64_t) stream_id
);
89 if (!lttng_live_stream
->stream
) {
90 BT_CPPLOGE_APPEND_CAUSE_SPEC(
91 lttng_live_stream
->logger
,
92 "Cannot create stream {} (stream class ID {}, stream ID {})",
93 lttng_live_stream
->name
->str
, stream_class_id
, stream_id
);
97 bt_stream_set_name(lttng_live_stream
->stream
, lttng_live_stream
->name
->str
);
101 return lttng_live_stream
->stream
;
104 static struct ctf_msg_iter_medium_ops medops
= {
111 enum lttng_live_iterator_status
lttng_live_lazy_msg_init(struct lttng_live_session
*session
,
112 bt_self_message_iterator
*self_msg_iter
)
114 struct lttng_live_component
*lttng_live
= session
->lttng_live_msg_iter
->lttng_live_comp
;
115 uint64_t trace_idx
, stream_iter_idx
;
117 if (!session
->lazy_stream_msg_init
) {
118 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
121 BT_CPPLOGD_SPEC(session
->logger
,
122 "Lazily initializing self message iterator for live session: "
123 "session-id={}, self-msg-iter-addr={}",
124 session
->id
, fmt::ptr(self_msg_iter
));
126 for (trace_idx
= 0; trace_idx
< session
->traces
->len
; trace_idx
++) {
127 struct lttng_live_trace
*trace
=
128 (lttng_live_trace
*) g_ptr_array_index(session
->traces
, trace_idx
);
130 for (stream_iter_idx
= 0; stream_iter_idx
< trace
->stream_iterators
->len
;
132 struct ctf_trace_class
*ctf_tc
;
133 struct lttng_live_stream_iterator
*stream_iter
=
134 (lttng_live_stream_iterator
*) g_ptr_array_index(trace
->stream_iterators
,
137 if (stream_iter
->msg_iter
) {
140 ctf_tc
= ctf_metadata_decoder_borrow_ctf_trace_class(trace
->metadata
->decoder
.get());
141 BT_CPPLOGD_SPEC(stream_iter
->logger
,
142 "Creating CTF message iterator: session-id={}, ctf-tc-addr={}, "
143 "stream-iter-name={}, self-msg-iter-addr={}",
144 session
->id
, fmt::ptr(ctf_tc
), stream_iter
->name
->str
,
145 fmt::ptr(self_msg_iter
));
146 stream_iter
->msg_iter
=
147 ctf_msg_iter_create(ctf_tc
, lttng_live
->max_query_size
, medops
, stream_iter
,
148 self_msg_iter
, stream_iter
->logger
)
150 if (!stream_iter
->msg_iter
) {
151 BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter
->logger
,
152 "Failed to create CTF message iterator");
158 session
->lazy_stream_msg_init
= false;
160 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
163 return LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
166 struct lttng_live_stream_iterator
*
167 lttng_live_stream_iterator_create(struct lttng_live_session
*session
, uint64_t ctf_trace_id
,
168 uint64_t stream_id
, bt_self_message_iterator
*self_msg_iter
)
170 lttng_live_stream_iterator
*stream_iter
= nullptr;
173 BT_ASSERT(session
->lttng_live_msg_iter
);
174 BT_ASSERT(session
->lttng_live_msg_iter
->lttng_live_comp
);
176 lttng_live_component
*lttng_live
= session
->lttng_live_msg_iter
->lttng_live_comp
;
177 lttng_live_trace
*trace
=
178 lttng_live_session_borrow_or_create_trace_by_id(session
, ctf_trace_id
);
180 BT_CPPLOGE_APPEND_CAUSE_SPEC(session
->logger
, "Failed to borrow CTF trace.");
184 stream_iter
= new lttng_live_stream_iterator
{session
->logger
};
185 stream_iter
->trace
= trace
;
186 stream_iter
->state
= LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
;
187 stream_iter
->viewer_stream_id
= stream_id
;
189 stream_iter
->ctf_stream_class_id
.is_set
= false;
190 stream_iter
->ctf_stream_class_id
.value
= UINT64_MAX
;
192 stream_iter
->last_inactivity_ts
.is_set
= false;
193 stream_iter
->last_inactivity_ts
.value
= 0;
196 struct ctf_trace_class
*ctf_tc
=
197 ctf_metadata_decoder_borrow_ctf_trace_class(trace
->metadata
->decoder
.get());
198 BT_ASSERT(!stream_iter
->msg_iter
);
199 stream_iter
->msg_iter
= ctf_msg_iter_create(ctf_tc
, lttng_live
->max_query_size
, medops
,
200 stream_iter
, self_msg_iter
, stream_iter
->logger
)
202 if (!stream_iter
->msg_iter
) {
203 BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter
->logger
,
204 "Failed to create CTF message iterator");
208 stream_iter
->buf
= g_new0(uint8_t, lttng_live
->max_query_size
);
209 if (!stream_iter
->buf
) {
210 BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter
->logger
,
211 "Failed to allocate live stream iterator buffer");
215 stream_iter
->buflen
= lttng_live
->max_query_size
;
216 stream_iter
->name
= g_string_new(NULL
);
217 if (!stream_iter
->name
) {
218 BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter
->logger
,
219 "Failed to allocate live stream iterator name buffer");
223 g_string_printf(stream_iter
->name
, STREAM_NAME_PREFIX
"%" PRIu64
,
224 stream_iter
->viewer_stream_id
);
225 g_ptr_array_add(trace
->stream_iterators
, stream_iter
);
227 /* Track the number of active stream iterator. */
228 session
->lttng_live_msg_iter
->active_stream_iter
++;
232 lttng_live_stream_iterator_destroy(stream_iter
);
238 void lttng_live_stream_iterator_destroy(struct lttng_live_stream_iterator
*stream_iter
)
244 if (stream_iter
->stream
) {
245 BT_STREAM_PUT_REF_AND_RESET(stream_iter
->stream
);
248 if (stream_iter
->msg_iter
) {
249 ctf_msg_iter_destroy(stream_iter
->msg_iter
);
251 g_free(stream_iter
->buf
);
252 if (stream_iter
->name
) {
253 g_string_free(stream_iter
->name
, TRUE
);
256 bt_message_put_ref(stream_iter
->current_msg
);
258 /* Track the number of active stream iterator. */
259 stream_iter
->trace
->session
->lttng_live_msg_iter
->active_stream_iter
--;