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/bt2s/make-unique.hpp"
21 #include "cpp-common/vendor/fmt/format.h"
23 #include "../common/src/msg-iter/msg-iter.hpp"
24 #include "data-stream.hpp"
26 #define STREAM_NAME_PREFIX "stream-"
28 static enum ctf_msg_iter_medium_status
medop_request_bytes(size_t request_sz
, uint8_t **buffer_addr
,
29 size_t *buffer_sz
, void *data
)
31 enum ctf_msg_iter_medium_status status
= CTF_MSG_ITER_MEDIUM_STATUS_OK
;
32 lttng_live_stream_iterator
*stream
= (lttng_live_stream_iterator
*) data
;
33 struct lttng_live_trace
*trace
= stream
->trace
;
34 struct lttng_live_session
*session
= trace
->session
;
35 struct lttng_live_msg_iter
*live_msg_iter
= session
->lttng_live_msg_iter
;
36 uint64_t recv_len
= 0;
40 BT_ASSERT(request_sz
);
42 if (stream
->has_stream_hung_up
) {
43 status
= CTF_MSG_ITER_MEDIUM_STATUS_EOF
;
47 len_left
= stream
->base_offset
+ stream
->len
- stream
->offset
;
49 lttng_live_stream_iterator_set_state(stream
, LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
);
50 status
= CTF_MSG_ITER_MEDIUM_STATUS_AGAIN
;
54 read_len
= MIN(request_sz
, stream
->buf
.size());
55 read_len
= MIN(read_len
, len_left
);
56 status
= lttng_live_get_stream_bytes(live_msg_iter
, stream
, stream
->buf
.data(), stream
->offset
,
58 *buffer_addr
= stream
->buf
.data();
59 *buffer_sz
= recv_len
;
60 stream
->offset
+= recv_len
;
65 static bt_stream
*medop_borrow_stream(bt_stream_class
*stream_class
, int64_t stream_id
, void *data
)
67 lttng_live_stream_iterator
*lttng_live_stream
= (lttng_live_stream_iterator
*) data
;
69 if (!lttng_live_stream
->stream
) {
70 uint64_t stream_class_id
= bt_stream_class_get_id(stream_class
);
72 BT_CPPLOGI_SPEC(lttng_live_stream
->logger
,
73 "Creating stream {} (ID: {}) out of stream class {}",
74 lttng_live_stream
->name
, stream_id
, stream_class_id
);
80 * No stream instance ID in the stream. It's possible
81 * to encounter this situation with older version of
82 * LTTng. In these cases, use the viewer_stream_id that
83 * is unique for a live viewer session.
86 bt_stream_create_with_id(stream_class
, lttng_live_stream
->trace
->trace
->libObjPtr(),
87 lttng_live_stream
->viewer_stream_id
);
89 stream
= bt_stream_create_with_id(
90 stream_class
, lttng_live_stream
->trace
->trace
->libObjPtr(), (uint64_t) stream_id
);
94 BT_CPPLOGE_APPEND_CAUSE_SPEC(
95 lttng_live_stream
->logger
,
96 "Cannot create stream {} (stream class ID {}, stream ID {})",
97 lttng_live_stream
->name
, stream_class_id
, stream_id
);
101 lttng_live_stream
->stream
= bt2::Stream::Shared::createWithoutRef(stream
);
103 lttng_live_stream
->stream
->name(lttng_live_stream
->name
);
106 return lttng_live_stream
->stream
->libObjPtr();
109 static struct ctf_msg_iter_medium_ops medops
= {
116 enum lttng_live_iterator_status
lttng_live_lazy_msg_init(struct lttng_live_session
*session
,
117 bt_self_message_iterator
*self_msg_iter
)
119 struct lttng_live_component
*lttng_live
= session
->lttng_live_msg_iter
->lttng_live_comp
;
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 (lttng_live_trace::UP
& trace
: session
->traces
) {
131 for (lttng_live_stream_iterator::UP
& stream_iter
: trace
->stream_iterators
) {
132 struct ctf_trace_class
*ctf_tc
;
134 if (stream_iter
->msg_iter
) {
138 ctf_tc
= ctf_metadata_decoder_borrow_ctf_trace_class(trace
->metadata
->decoder
.get());
139 BT_CPPLOGD_SPEC(stream_iter
->logger
,
140 "Creating CTF message iterator: session-id={}, ctf-tc-addr={}, "
141 "stream-iter-name={}, self-msg-iter-addr={}",
142 session
->id
, fmt::ptr(ctf_tc
), stream_iter
->name
,
143 fmt::ptr(self_msg_iter
));
144 stream_iter
->msg_iter
=
145 ctf_msg_iter_create(ctf_tc
, lttng_live
->max_query_size
, medops
, stream_iter
.get(),
146 self_msg_iter
, stream_iter
->logger
);
147 if (!stream_iter
->msg_iter
) {
148 BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter
->logger
,
149 "Failed to create CTF message iterator");
155 session
->lazy_stream_msg_init
= false;
157 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
160 return LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
163 struct lttng_live_stream_iterator
*
164 lttng_live_stream_iterator_create(struct lttng_live_session
*session
, uint64_t ctf_trace_id
,
165 uint64_t stream_id
, bt_self_message_iterator
*self_msg_iter
)
167 std::stringstream nameSs
;
170 BT_ASSERT(session
->lttng_live_msg_iter
);
171 BT_ASSERT(session
->lttng_live_msg_iter
->lttng_live_comp
);
173 lttng_live_component
*lttng_live
= session
->lttng_live_msg_iter
->lttng_live_comp
;
174 lttng_live_trace
*trace
=
175 lttng_live_session_borrow_or_create_trace_by_id(session
, ctf_trace_id
);
177 BT_CPPLOGE_APPEND_CAUSE_SPEC(session
->logger
, "Failed to borrow CTF trace.");
181 auto stream_iter
= bt2s::make_unique
<lttng_live_stream_iterator
>(session
->logger
);
183 stream_iter
->trace
= trace
;
184 stream_iter
->state
= LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
;
185 stream_iter
->viewer_stream_id
= stream_id
;
187 stream_iter
->ctf_stream_class_id
.is_set
= false;
188 stream_iter
->ctf_stream_class_id
.value
= UINT64_MAX
;
190 stream_iter
->last_inactivity_ts
.is_set
= false;
191 stream_iter
->last_inactivity_ts
.value
= 0;
194 struct ctf_trace_class
*ctf_tc
=
195 ctf_metadata_decoder_borrow_ctf_trace_class(trace
->metadata
->decoder
.get());
196 BT_ASSERT(!stream_iter
->msg_iter
);
197 stream_iter
->msg_iter
=
198 ctf_msg_iter_create(ctf_tc
, lttng_live
->max_query_size
, medops
, stream_iter
.get(),
199 self_msg_iter
, stream_iter
->logger
);
200 if (!stream_iter
->msg_iter
) {
201 BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter
->logger
,
202 "Failed to create CTF message iterator");
206 stream_iter
->buf
.resize(lttng_live
->max_query_size
);
208 nameSs
<< STREAM_NAME_PREFIX
<< stream_iter
->viewer_stream_id
;
209 stream_iter
->name
= nameSs
.str();
211 const auto ret
= stream_iter
.get();
212 trace
->stream_iterators
.emplace_back(std::move(stream_iter
));
214 /* Track the number of active stream iterator. */
215 session
->lttng_live_msg_iter
->active_stream_iter
++;
220 lttng_live_stream_iterator::~lttng_live_stream_iterator()
222 /* Track the number of active stream iterator. */
223 this->trace
->session
->lttng_live_msg_iter
->active_stream_iter
--;