| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 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 |
| 8 | */ |
| 9 | |
| 10 | #include <sstream> |
| 11 | |
| 12 | #include <glib.h> |
| 13 | #include <stdio.h> |
| 14 | #include <stdlib.h> |
| 15 | |
| 16 | #include <babeltrace2/babeltrace.h> |
| 17 | |
| 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" |
| 22 | |
| 23 | #include "../common/src/msg-iter/msg-iter.hpp" |
| 24 | #include "data-stream.hpp" |
| 25 | |
| 26 | #define STREAM_NAME_PREFIX "stream-" |
| 27 | |
| 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) |
| 30 | { |
| 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; |
| 36 | uint64_t len_left; |
| 37 | uint64_t read_len; |
| 38 | |
| 39 | BT_ASSERT(request_sz); |
| 40 | |
| 41 | if (stream->has_stream_hung_up) { |
| 42 | return CTF_MSG_ITER_MEDIUM_STATUS_EOF; |
| 43 | } |
| 44 | |
| 45 | len_left = stream->base_offset + stream->len - stream->offset; |
| 46 | if (!len_left) { |
| 47 | lttng_live_stream_iterator_set_state(stream, LTTNG_LIVE_STREAM_ACTIVE_NO_DATA); |
| 48 | return CTF_MSG_ITER_MEDIUM_STATUS_AGAIN; |
| 49 | } |
| 50 | |
| 51 | read_len = MIN(request_sz, stream->buf.size()); |
| 52 | read_len = MIN(read_len, len_left); |
| 53 | |
| 54 | const auto status = lttng_live_get_stream_bytes(live_msg_iter, stream, stream->buf.data(), |
| 55 | stream->offset, read_len, &recv_len); |
| 56 | |
| 57 | if (status != CTF_MSG_ITER_MEDIUM_STATUS_OK) { |
| 58 | return status; |
| 59 | } |
| 60 | |
| 61 | *buffer_addr = stream->buf.data(); |
| 62 | *buffer_sz = recv_len; |
| 63 | stream->offset += recv_len; |
| 64 | |
| 65 | return CTF_MSG_ITER_MEDIUM_STATUS_OK; |
| 66 | } |
| 67 | |
| 68 | static bt_stream *medop_borrow_stream(bt_stream_class *stream_class, int64_t stream_id, void *data) |
| 69 | { |
| 70 | lttng_live_stream_iterator *lttng_live_stream = (lttng_live_stream_iterator *) data; |
| 71 | |
| 72 | if (!lttng_live_stream->stream) { |
| 73 | uint64_t stream_class_id = bt_stream_class_get_id(stream_class); |
| 74 | |
| 75 | BT_CPPLOGI_SPEC(lttng_live_stream->logger, |
| 76 | "Creating stream {} (ID: {}) out of stream class {}", |
| 77 | lttng_live_stream->name, stream_id, stream_class_id); |
| 78 | |
| 79 | bt_stream *stream; |
| 80 | |
| 81 | if (stream_id < 0) { |
| 82 | /* |
| 83 | * No stream instance ID in the stream. It's possible |
| 84 | * to encounter this situation with older version of |
| 85 | * LTTng. In these cases, use the viewer_stream_id that |
| 86 | * is unique for a live viewer session. |
| 87 | */ |
| 88 | stream = |
| 89 | bt_stream_create_with_id(stream_class, lttng_live_stream->trace->trace->libObjPtr(), |
| 90 | lttng_live_stream->viewer_stream_id); |
| 91 | } else { |
| 92 | stream = bt_stream_create_with_id( |
| 93 | stream_class, lttng_live_stream->trace->trace->libObjPtr(), (uint64_t) stream_id); |
| 94 | } |
| 95 | |
| 96 | if (!stream) { |
| 97 | BT_CPPLOGE_APPEND_CAUSE_SPEC( |
| 98 | lttng_live_stream->logger, |
| 99 | "Cannot create stream {} (stream class ID {}, stream ID {})", |
| 100 | lttng_live_stream->name, stream_class_id, stream_id); |
| 101 | return nullptr; |
| 102 | } |
| 103 | |
| 104 | lttng_live_stream->stream = bt2::Stream::Shared::createWithoutRef(stream); |
| 105 | |
| 106 | lttng_live_stream->stream->name(lttng_live_stream->name); |
| 107 | } |
| 108 | |
| 109 | return lttng_live_stream->stream->libObjPtr(); |
| 110 | } |
| 111 | |
| 112 | static struct ctf_msg_iter_medium_ops medops = { |
| 113 | medop_request_bytes, |
| 114 | nullptr, |
| 115 | nullptr, |
| 116 | medop_borrow_stream, |
| 117 | }; |
| 118 | |
| 119 | enum lttng_live_iterator_status lttng_live_lazy_msg_init(struct lttng_live_session *session, |
| 120 | bt_self_message_iterator *self_msg_iter) |
| 121 | { |
| 122 | struct lttng_live_component *lttng_live = session->lttng_live_msg_iter->lttng_live_comp; |
| 123 | |
| 124 | if (!session->lazy_stream_msg_init) { |
| 125 | return LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 126 | } |
| 127 | |
| 128 | BT_CPPLOGD_SPEC(session->logger, |
| 129 | "Lazily initializing self message iterator for live session: " |
| 130 | "session-id={}, self-msg-iter-addr={}", |
| 131 | session->id, fmt::ptr(self_msg_iter)); |
| 132 | |
| 133 | for (lttng_live_trace::UP& trace : session->traces) { |
| 134 | for (lttng_live_stream_iterator::UP& stream_iter : trace->stream_iterators) { |
| 135 | struct ctf_trace_class *ctf_tc; |
| 136 | |
| 137 | if (stream_iter->msg_iter) { |
| 138 | continue; |
| 139 | } |
| 140 | |
| 141 | ctf_tc = ctf_metadata_decoder_borrow_ctf_trace_class(trace->metadata->decoder.get()); |
| 142 | BT_CPPLOGD_SPEC(stream_iter->logger, |
| 143 | "Creating CTF message iterator: session-id={}, ctf-tc-addr={}, " |
| 144 | "stream-iter-name={}, self-msg-iter-addr={}", |
| 145 | session->id, fmt::ptr(ctf_tc), stream_iter->name, |
| 146 | fmt::ptr(self_msg_iter)); |
| 147 | stream_iter->msg_iter = |
| 148 | ctf_msg_iter_create(ctf_tc, lttng_live->max_query_size, medops, stream_iter.get(), |
| 149 | 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"); |
| 153 | return LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 154 | } |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | session->lazy_stream_msg_init = false; |
| 159 | |
| 160 | return LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 161 | } |
| 162 | |
| 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) |
| 166 | { |
| 167 | std::stringstream nameSs; |
| 168 | |
| 169 | BT_ASSERT(session); |
| 170 | BT_ASSERT(session->lttng_live_msg_iter); |
| 171 | BT_ASSERT(session->lttng_live_msg_iter->lttng_live_comp); |
| 172 | |
| 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); |
| 176 | if (!trace) { |
| 177 | BT_CPPLOGE_APPEND_CAUSE_SPEC(session->logger, "Failed to borrow CTF trace."); |
| 178 | return nullptr; |
| 179 | } |
| 180 | |
| 181 | auto stream_iter = bt2s::make_unique<lttng_live_stream_iterator>(session->logger); |
| 182 | |
| 183 | stream_iter->trace = trace; |
| 184 | stream_iter->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA; |
| 185 | stream_iter->viewer_stream_id = stream_id; |
| 186 | |
| 187 | stream_iter->ctf_stream_class_id.is_set = false; |
| 188 | stream_iter->ctf_stream_class_id.value = UINT64_MAX; |
| 189 | |
| 190 | stream_iter->last_inactivity_ts.is_set = false; |
| 191 | stream_iter->last_inactivity_ts.value = 0; |
| 192 | |
| 193 | if (trace->trace) { |
| 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"); |
| 203 | return nullptr; |
| 204 | } |
| 205 | } |
| 206 | stream_iter->buf.resize(lttng_live->max_query_size); |
| 207 | |
| 208 | nameSs << STREAM_NAME_PREFIX << stream_iter->viewer_stream_id; |
| 209 | stream_iter->name = nameSs.str(); |
| 210 | |
| 211 | const auto ret = stream_iter.get(); |
| 212 | trace->stream_iterators.emplace_back(std::move(stream_iter)); |
| 213 | |
| 214 | /* Track the number of active stream iterator. */ |
| 215 | session->lttng_live_msg_iter->active_stream_iter++; |
| 216 | |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | lttng_live_stream_iterator::~lttng_live_stream_iterator() |
| 221 | { |
| 222 | /* Track the number of active stream iterator. */ |
| 223 | this->trace->session->lttng_live_msg_iter->active_stream_iter--; |
| 224 | } |