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
16 #include <babeltrace2/babeltrace.h>
18 #include "common/assert.h"
19 #include "compat/mman.h" /* IWYU pragma: keep */
20 #include "cpp-common/vendor/fmt/format.h"
22 #include "../common/src/msg-iter/msg-iter.hpp"
23 #include "data-stream.hpp"
25 #define STREAM_NAME_PREFIX "stream-"
27 static enum ctf_msg_iter_medium_status
medop_request_bytes(size_t request_sz
, uint8_t **buffer_addr
,
28 size_t *buffer_sz
, void *data
)
30 enum ctf_msg_iter_medium_status status
= CTF_MSG_ITER_MEDIUM_STATUS_OK
;
31 lttng_live_stream_iterator
*stream
= (lttng_live_stream_iterator
*) data
;
32 struct lttng_live_trace
*trace
= stream
->trace
;
33 struct lttng_live_session
*session
= trace
->session
;
34 struct lttng_live_msg_iter
*live_msg_iter
= session
->lttng_live_msg_iter
;
35 uint64_t recv_len
= 0;
39 BT_ASSERT(request_sz
);
41 if (stream
->has_stream_hung_up
) {
42 status
= CTF_MSG_ITER_MEDIUM_STATUS_EOF
;
46 len_left
= stream
->base_offset
+ stream
->len
- stream
->offset
;
48 lttng_live_stream_iterator_set_state(stream
, LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
);
49 status
= CTF_MSG_ITER_MEDIUM_STATUS_AGAIN
;
53 read_len
= MIN(request_sz
, stream
->buf
.size());
54 read_len
= MIN(read_len
, len_left
);
55 status
= lttng_live_get_stream_bytes(live_msg_iter
, stream
, stream
->buf
.data(), stream
->offset
,
57 *buffer_addr
= stream
->buf
.data();
58 *buffer_sz
= recv_len
;
59 stream
->offset
+= recv_len
;
64 static bt_stream
*medop_borrow_stream(bt_stream_class
*stream_class
, int64_t stream_id
, void *data
)
66 lttng_live_stream_iterator
*lttng_live_stream
= (lttng_live_stream_iterator
*) data
;
68 if (!lttng_live_stream
->stream
) {
69 uint64_t stream_class_id
= bt_stream_class_get_id(stream_class
);
71 BT_CPPLOGI_SPEC(lttng_live_stream
->logger
,
72 "Creating stream {} (ID: {}) out of stream class {}",
73 lttng_live_stream
->name
, stream_id
, stream_class_id
);
79 * No stream instance ID in the stream. It's possible
80 * to encounter this situation with older version of
81 * LTTng. In these cases, use the viewer_stream_id that
82 * is unique for a live viewer session.
85 bt_stream_create_with_id(stream_class
, lttng_live_stream
->trace
->trace
->libObjPtr(),
86 lttng_live_stream
->viewer_stream_id
);
88 stream
= bt_stream_create_with_id(
89 stream_class
, lttng_live_stream
->trace
->trace
->libObjPtr(), (uint64_t) stream_id
);
93 BT_CPPLOGE_APPEND_CAUSE_SPEC(
94 lttng_live_stream
->logger
,
95 "Cannot create stream {} (stream class ID {}, stream ID {})",
96 lttng_live_stream
->name
, stream_class_id
, stream_id
);
100 lttng_live_stream
->stream
= bt2::Stream::Shared::createWithoutRef(stream
);
102 lttng_live_stream
->stream
->name(lttng_live_stream
->name
);
105 return lttng_live_stream
->stream
->libObjPtr();
108 static struct ctf_msg_iter_medium_ops medops
= {
115 enum lttng_live_iterator_status
lttng_live_lazy_msg_init(struct lttng_live_session
*session
,
116 bt_self_message_iterator
*self_msg_iter
)
118 struct lttng_live_component
*lttng_live
= session
->lttng_live_msg_iter
->lttng_live_comp
;
119 uint64_t trace_idx
, stream_iter_idx
;
121 if (!session
->lazy_stream_msg_init
) {
122 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
125 BT_CPPLOGD_SPEC(session
->logger
,
126 "Lazily initializing self message iterator for live session: "
127 "session-id={}, self-msg-iter-addr={}",
128 session
->id
, fmt::ptr(self_msg_iter
));
130 for (trace_idx
= 0; trace_idx
< session
->traces
->len
; trace_idx
++) {
131 struct lttng_live_trace
*trace
=
132 (lttng_live_trace
*) g_ptr_array_index(session
->traces
, trace_idx
);
134 for (stream_iter_idx
= 0; stream_iter_idx
< trace
->stream_iterators
->len
;
136 struct ctf_trace_class
*ctf_tc
;
137 struct lttng_live_stream_iterator
*stream_iter
=
138 (lttng_live_stream_iterator
*) g_ptr_array_index(trace
->stream_iterators
,
141 if (stream_iter
->msg_iter
) {
144 ctf_tc
= ctf_metadata_decoder_borrow_ctf_trace_class(trace
->metadata
->decoder
.get());
145 BT_CPPLOGD_SPEC(stream_iter
->logger
,
146 "Creating CTF message iterator: session-id={}, ctf-tc-addr={}, "
147 "stream-iter-name={}, self-msg-iter-addr={}",
148 session
->id
, fmt::ptr(ctf_tc
), stream_iter
->name
,
149 fmt::ptr(self_msg_iter
));
150 stream_iter
->msg_iter
=
151 ctf_msg_iter_create(ctf_tc
, lttng_live
->max_query_size
, medops
, stream_iter
,
152 self_msg_iter
, stream_iter
->logger
);
153 if (!stream_iter
->msg_iter
) {
154 BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter
->logger
,
155 "Failed to create CTF message iterator");
161 session
->lazy_stream_msg_init
= false;
163 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
166 return LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
169 struct lttng_live_stream_iterator
*
170 lttng_live_stream_iterator_create(struct lttng_live_session
*session
, uint64_t ctf_trace_id
,
171 uint64_t stream_id
, bt_self_message_iterator
*self_msg_iter
)
173 lttng_live_stream_iterator
*stream_iter
= nullptr;
174 std::stringstream nameSs
;
177 BT_ASSERT(session
->lttng_live_msg_iter
);
178 BT_ASSERT(session
->lttng_live_msg_iter
->lttng_live_comp
);
180 lttng_live_component
*lttng_live
= session
->lttng_live_msg_iter
->lttng_live_comp
;
181 lttng_live_trace
*trace
=
182 lttng_live_session_borrow_or_create_trace_by_id(session
, ctf_trace_id
);
184 BT_CPPLOGE_APPEND_CAUSE_SPEC(session
->logger
, "Failed to borrow CTF trace.");
188 stream_iter
= new lttng_live_stream_iterator
{session
->logger
};
189 stream_iter
->trace
= trace
;
190 stream_iter
->state
= LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
;
191 stream_iter
->viewer_stream_id
= stream_id
;
193 stream_iter
->ctf_stream_class_id
.is_set
= false;
194 stream_iter
->ctf_stream_class_id
.value
= UINT64_MAX
;
196 stream_iter
->last_inactivity_ts
.is_set
= false;
197 stream_iter
->last_inactivity_ts
.value
= 0;
200 struct ctf_trace_class
*ctf_tc
=
201 ctf_metadata_decoder_borrow_ctf_trace_class(trace
->metadata
->decoder
.get());
202 BT_ASSERT(!stream_iter
->msg_iter
);
203 stream_iter
->msg_iter
=
204 ctf_msg_iter_create(ctf_tc
, lttng_live
->max_query_size
, medops
, stream_iter
,
205 self_msg_iter
, stream_iter
->logger
);
206 if (!stream_iter
->msg_iter
) {
207 BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter
->logger
,
208 "Failed to create CTF message iterator");
212 stream_iter
->buf
.resize(lttng_live
->max_query_size
);
214 nameSs
<< STREAM_NAME_PREFIX
<< stream_iter
->viewer_stream_id
;
215 stream_iter
->name
= nameSs
.str();
216 g_ptr_array_add(trace
->stream_iterators
, stream_iter
);
218 /* Track the number of active stream iterator. */
219 session
->lttng_live_msg_iter
->active_stream_iter
++;
223 lttng_live_stream_iterator_destroy(stream_iter
);
229 void lttng_live_stream_iterator_destroy(struct lttng_live_stream_iterator
*stream_iter
)
235 bt_message_put_ref(stream_iter
->current_msg
);
237 /* Track the number of active stream iterator. */
238 stream_iter
->trace
->session
->lttng_live_msg_iter
->active_stream_iter
--;