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7cdc2bab | 1 | /* |
0235b0db | 2 | * SPDX-License-Identifier: MIT |
7cdc2bab | 3 | * |
0235b0db MJ |
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 | |
7cdc2bab MD |
8 | */ |
9 | ||
e28ca558 SM |
10 | #include <sstream> |
11 | ||
c802cacb | 12 | #include <glib.h> |
7cdc2bab | 13 | #include <stdio.h> |
5656cea5 PP |
14 | #include <stdlib.h> |
15 | ||
16 | #include <babeltrace2/babeltrace.h> | |
17 | ||
578e048b | 18 | #include "common/assert.h" |
83ad336c | 19 | #include "compat/mman.h" /* IWYU pragma: keep */ |
6eeff3ca | 20 | #include "cpp-common/bt2s/make-unique.hpp" |
0f5c5d5c | 21 | #include "cpp-common/vendor/fmt/format.h" |
c802cacb | 22 | |
5656cea5 | 23 | #include "../common/src/msg-iter/msg-iter.hpp" |
087cd0f5 | 24 | #include "data-stream.hpp" |
7cdc2bab | 25 | |
4164020e | 26 | #define STREAM_NAME_PREFIX "stream-" |
14f28187 | 27 | |
4164020e SM |
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) | |
7cdc2bab | 30 | { |
4164020e SM |
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; | |
37 | uint64_t len_left; | |
38 | uint64_t read_len; | |
39 | ||
40 | BT_ASSERT(request_sz); | |
41 | ||
42 | if (stream->has_stream_hung_up) { | |
43 | status = CTF_MSG_ITER_MEDIUM_STATUS_EOF; | |
44 | goto end; | |
45 | } | |
46 | ||
47 | len_left = stream->base_offset + stream->len - stream->offset; | |
48 | if (!len_left) { | |
49 | lttng_live_stream_iterator_set_state(stream, LTTNG_LIVE_STREAM_ACTIVE_NO_DATA); | |
50 | status = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN; | |
51 | goto end; | |
52 | } | |
53 | ||
afbf59c4 | 54 | read_len = MIN(request_sz, stream->buf.size()); |
4164020e | 55 | read_len = MIN(read_len, len_left); |
afbf59c4 | 56 | status = lttng_live_get_stream_bytes(live_msg_iter, stream, stream->buf.data(), stream->offset, |
4164020e | 57 | read_len, &recv_len); |
afbf59c4 | 58 | *buffer_addr = stream->buf.data(); |
4164020e SM |
59 | *buffer_sz = recv_len; |
60 | stream->offset += recv_len; | |
4a39caef | 61 | end: |
4164020e | 62 | return status; |
7cdc2bab MD |
63 | } |
64 | ||
4164020e | 65 | static bt_stream *medop_borrow_stream(bt_stream_class *stream_class, int64_t stream_id, void *data) |
7cdc2bab | 66 | { |
4164020e | 67 | lttng_live_stream_iterator *lttng_live_stream = (lttng_live_stream_iterator *) data; |
4164020e SM |
68 | |
69 | if (!lttng_live_stream->stream) { | |
70 | uint64_t stream_class_id = bt_stream_class_get_id(stream_class); | |
71 | ||
0f5c5d5c SM |
72 | BT_CPPLOGI_SPEC(lttng_live_stream->logger, |
73 | "Creating stream {} (ID: {}) out of stream class {}", | |
e28ca558 | 74 | lttng_live_stream->name, stream_id, stream_class_id); |
4164020e | 75 | |
0b68f2bc SM |
76 | bt_stream *stream; |
77 | ||
4164020e SM |
78 | if (stream_id < 0) { |
79 | /* | |
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. | |
84 | */ | |
0b68f2bc | 85 | stream = |
7916e7eb SM |
86 | bt_stream_create_with_id(stream_class, lttng_live_stream->trace->trace->libObjPtr(), |
87 | lttng_live_stream->viewer_stream_id); | |
4164020e | 88 | } else { |
0b68f2bc | 89 | stream = bt_stream_create_with_id( |
7916e7eb | 90 | stream_class, lttng_live_stream->trace->trace->libObjPtr(), (uint64_t) stream_id); |
4164020e SM |
91 | } |
92 | ||
0b68f2bc | 93 | if (!stream) { |
0f5c5d5c SM |
94 | BT_CPPLOGE_APPEND_CAUSE_SPEC( |
95 | lttng_live_stream->logger, | |
96 | "Cannot create stream {} (stream class ID {}, stream ID {})", | |
e28ca558 | 97 | lttng_live_stream->name, stream_class_id, stream_id); |
0b68f2bc | 98 | return nullptr; |
4164020e SM |
99 | } |
100 | ||
0b68f2bc | 101 | lttng_live_stream->stream = bt2::Stream::Shared::createWithoutRef(stream); |
e28ca558 SM |
102 | |
103 | lttng_live_stream->stream->name(lttng_live_stream->name); | |
4164020e | 104 | } |
7cdc2bab | 105 | |
0b68f2bc | 106 | return lttng_live_stream->stream->libObjPtr(); |
7cdc2bab MD |
107 | } |
108 | ||
18a1979b | 109 | static struct ctf_msg_iter_medium_ops medops = { |
4164020e SM |
110 | medop_request_bytes, |
111 | nullptr, | |
112 | nullptr, | |
113 | medop_borrow_stream, | |
7cdc2bab MD |
114 | }; |
115 | ||
4164020e SM |
116 | enum lttng_live_iterator_status lttng_live_lazy_msg_init(struct lttng_live_session *session, |
117 | bt_self_message_iterator *self_msg_iter) | |
7cdc2bab | 118 | { |
4164020e | 119 | struct lttng_live_component *lttng_live = session->lttng_live_msg_iter->lttng_live_comp; |
db00b877 | 120 | uint64_t trace_idx; |
4164020e SM |
121 | |
122 | if (!session->lazy_stream_msg_init) { | |
123 | return LTTNG_LIVE_ITERATOR_STATUS_OK; | |
124 | } | |
125 | ||
0f5c5d5c SM |
126 | BT_CPPLOGD_SPEC(session->logger, |
127 | "Lazily initializing self message iterator for live session: " | |
128 | "session-id={}, self-msg-iter-addr={}", | |
129 | session->id, fmt::ptr(self_msg_iter)); | |
4164020e SM |
130 | |
131 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { | |
132 | struct lttng_live_trace *trace = | |
133 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); | |
134 | ||
db00b877 | 135 | for (lttng_live_stream_iterator::UP& stream_iter : trace->stream_iterators) { |
4164020e | 136 | struct ctf_trace_class *ctf_tc; |
4164020e SM |
137 | |
138 | if (stream_iter->msg_iter) { | |
139 | continue; | |
140 | } | |
db00b877 | 141 | |
1fa280c9 | 142 | ctf_tc = ctf_metadata_decoder_borrow_ctf_trace_class(trace->metadata->decoder.get()); |
0f5c5d5c SM |
143 | BT_CPPLOGD_SPEC(stream_iter->logger, |
144 | "Creating CTF message iterator: session-id={}, ctf-tc-addr={}, " | |
145 | "stream-iter-name={}, self-msg-iter-addr={}", | |
e28ca558 | 146 | session->id, fmt::ptr(ctf_tc), stream_iter->name, |
0f5c5d5c | 147 | fmt::ptr(self_msg_iter)); |
4164020e | 148 | stream_iter->msg_iter = |
db00b877 | 149 | ctf_msg_iter_create(ctf_tc, lttng_live->max_query_size, medops, stream_iter.get(), |
2d5d8c7b | 150 | self_msg_iter, stream_iter->logger); |
4164020e | 151 | if (!stream_iter->msg_iter) { |
0f5c5d5c SM |
152 | BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter->logger, |
153 | "Failed to create CTF message iterator"); | |
4164020e SM |
154 | goto error; |
155 | } | |
156 | } | |
157 | } | |
158 | ||
159 | session->lazy_stream_msg_init = false; | |
160 | ||
161 | return LTTNG_LIVE_ITERATOR_STATUS_OK; | |
7cdc2bab MD |
162 | |
163 | error: | |
4164020e | 164 | return LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
7cdc2bab MD |
165 | } |
166 | ||
4164020e SM |
167 | struct lttng_live_stream_iterator * |
168 | lttng_live_stream_iterator_create(struct lttng_live_session *session, uint64_t ctf_trace_id, | |
169 | uint64_t stream_id, bt_self_message_iterator *self_msg_iter) | |
7cdc2bab | 170 | { |
e28ca558 | 171 | std::stringstream nameSs; |
4164020e SM |
172 | |
173 | BT_ASSERT(session); | |
174 | BT_ASSERT(session->lttng_live_msg_iter); | |
175 | BT_ASSERT(session->lttng_live_msg_iter->lttng_live_comp); | |
4164020e | 176 | |
0f5c5d5c SM |
177 | lttng_live_component *lttng_live = session->lttng_live_msg_iter->lttng_live_comp; |
178 | lttng_live_trace *trace = | |
179 | lttng_live_session_borrow_or_create_trace_by_id(session, ctf_trace_id); | |
4164020e | 180 | if (!trace) { |
0f5c5d5c | 181 | BT_CPPLOGE_APPEND_CAUSE_SPEC(session->logger, "Failed to borrow CTF trace."); |
6eeff3ca | 182 | return nullptr; |
4164020e SM |
183 | } |
184 | ||
6eeff3ca SM |
185 | auto stream_iter = bt2s::make_unique<lttng_live_stream_iterator>(session->logger); |
186 | ||
4164020e SM |
187 | stream_iter->trace = trace; |
188 | stream_iter->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA; | |
189 | stream_iter->viewer_stream_id = stream_id; | |
190 | ||
191 | stream_iter->ctf_stream_class_id.is_set = false; | |
192 | stream_iter->ctf_stream_class_id.value = UINT64_MAX; | |
193 | ||
194 | stream_iter->last_inactivity_ts.is_set = false; | |
195 | stream_iter->last_inactivity_ts.value = 0; | |
196 | ||
197 | if (trace->trace) { | |
198 | struct ctf_trace_class *ctf_tc = | |
1fa280c9 | 199 | ctf_metadata_decoder_borrow_ctf_trace_class(trace->metadata->decoder.get()); |
4164020e | 200 | BT_ASSERT(!stream_iter->msg_iter); |
2d5d8c7b | 201 | stream_iter->msg_iter = |
6eeff3ca | 202 | ctf_msg_iter_create(ctf_tc, lttng_live->max_query_size, medops, stream_iter.get(), |
2d5d8c7b | 203 | self_msg_iter, stream_iter->logger); |
4164020e | 204 | if (!stream_iter->msg_iter) { |
0f5c5d5c SM |
205 | BT_CPPLOGE_APPEND_CAUSE_SPEC(stream_iter->logger, |
206 | "Failed to create CTF message iterator"); | |
6eeff3ca | 207 | return nullptr; |
4164020e SM |
208 | } |
209 | } | |
afbf59c4 | 210 | stream_iter->buf.resize(lttng_live->max_query_size); |
4164020e | 211 | |
e28ca558 SM |
212 | nameSs << STREAM_NAME_PREFIX << stream_iter->viewer_stream_id; |
213 | stream_iter->name = nameSs.str(); | |
6eeff3ca SM |
214 | |
215 | const auto ret = stream_iter.get(); | |
db00b877 | 216 | trace->stream_iterators.emplace_back(std::move(stream_iter)); |
4164020e SM |
217 | |
218 | /* Track the number of active stream iterator. */ | |
219 | session->lttng_live_msg_iter->active_stream_iter++; | |
220 | ||
6eeff3ca | 221 | return ret; |
7cdc2bab MD |
222 | } |
223 | ||
ce4ee876 | 224 | lttng_live_stream_iterator::~lttng_live_stream_iterator() |
7cdc2bab | 225 | { |
4164020e | 226 | /* Track the number of active stream iterator. */ |
ce4ee876 SM |
227 | this->trace->session->lttng_live_msg_iter->active_stream_iter--; |
228 | } |