| 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 2010-2011 EfficiOS Inc. and Linux Foundation |
| 7 | */ |
| 8 | |
| 9 | #include "compat/memstream.h" |
| 10 | #include "cpp-common/bt2c/libc-up.hpp" |
| 11 | |
| 12 | #include "../common/src/metadata/tsdl/ctf-meta-configure-ir-trace.hpp" |
| 13 | #include "../common/src/metadata/tsdl/decoder.hpp" |
| 14 | #include "lttng-live.hpp" |
| 15 | #include "metadata.hpp" |
| 16 | |
| 17 | #define TSDL_MAGIC 0x75d11d57 |
| 18 | |
| 19 | struct packet_header |
| 20 | { |
| 21 | uint32_t magic; |
| 22 | uint8_t uuid[16]; |
| 23 | uint32_t checksum; |
| 24 | uint32_t content_size; |
| 25 | uint32_t packet_size; |
| 26 | uint8_t compression_scheme; |
| 27 | uint8_t encryption_scheme; |
| 28 | uint8_t checksum_scheme; |
| 29 | uint8_t major; |
| 30 | uint8_t minor; |
| 31 | } __attribute__((__packed__)); |
| 32 | |
| 33 | static bool stream_classes_all_have_default_clock_class(bt_trace_class *tc, |
| 34 | const bt2c::Logger& logger) |
| 35 | { |
| 36 | uint64_t i, sc_count; |
| 37 | const bt_clock_class *cc = NULL; |
| 38 | const bt_stream_class *sc; |
| 39 | bool ret = true; |
| 40 | |
| 41 | sc_count = bt_trace_class_get_stream_class_count(tc); |
| 42 | for (i = 0; i < sc_count; i++) { |
| 43 | sc = bt_trace_class_borrow_stream_class_by_index_const(tc, i); |
| 44 | |
| 45 | BT_ASSERT(sc); |
| 46 | |
| 47 | cc = bt_stream_class_borrow_default_clock_class_const(sc); |
| 48 | if (!cc) { |
| 49 | ret = false; |
| 50 | BT_CPPLOGE_APPEND_CAUSE_SPEC(logger, |
| 51 | "Stream class doesn't have a default clock class: " |
| 52 | "sc-id={}, sc-name=\"{}\"", |
| 53 | bt_stream_class_get_id(sc), bt_stream_class_get_name(sc)); |
| 54 | goto end; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | end: |
| 59 | return ret; |
| 60 | } |
| 61 | /* |
| 62 | * Iterate over the stream classes and returns the first clock class |
| 63 | * encountered. This is useful to create message iterator inactivity message as |
| 64 | * we don't need a particular clock class. |
| 65 | */ |
| 66 | static const bt_clock_class *borrow_any_clock_class(bt_trace_class *tc) |
| 67 | { |
| 68 | uint64_t i, sc_count; |
| 69 | const bt_clock_class *cc = NULL; |
| 70 | const bt_stream_class *sc; |
| 71 | |
| 72 | sc_count = bt_trace_class_get_stream_class_count(tc); |
| 73 | for (i = 0; i < sc_count; i++) { |
| 74 | sc = bt_trace_class_borrow_stream_class_by_index_const(tc, i); |
| 75 | BT_ASSERT_DBG(sc); |
| 76 | |
| 77 | cc = bt_stream_class_borrow_default_clock_class_const(sc); |
| 78 | if (cc) { |
| 79 | goto end; |
| 80 | } |
| 81 | } |
| 82 | end: |
| 83 | BT_ASSERT_DBG(cc); |
| 84 | return cc; |
| 85 | } |
| 86 | |
| 87 | enum lttng_live_iterator_status lttng_live_metadata_update(struct lttng_live_trace *trace) |
| 88 | { |
| 89 | struct lttng_live_session *session = trace->session; |
| 90 | struct lttng_live_metadata *metadata = trace->metadata; |
| 91 | std::vector<char> metadataBuf; |
| 92 | bool keep_receiving; |
| 93 | bt2c::FileUP fp; |
| 94 | enum ctf_metadata_decoder_status decoder_status; |
| 95 | enum lttng_live_iterator_status status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 96 | enum lttng_live_get_one_metadata_status metadata_status; |
| 97 | |
| 98 | BT_CPPLOGD_SPEC(metadata->logger, "Updating metadata for trace: session-id={}, trace-id={}", |
| 99 | session->id, trace->id); |
| 100 | |
| 101 | /* No metadata stream yet. */ |
| 102 | if (!metadata) { |
| 103 | if (session->closed) { |
| 104 | /* |
| 105 | * The session is closed AND we never received any |
| 106 | * metadata this indicates that we will never receive |
| 107 | * any metadata. |
| 108 | */ |
| 109 | status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 110 | } else if (session->new_streams_needed) { |
| 111 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 112 | } else { |
| 113 | session->new_streams_needed = true; |
| 114 | status = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 115 | } |
| 116 | goto end; |
| 117 | } |
| 118 | |
| 119 | if (trace->metadata_stream_state != LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED) { |
| 120 | goto end; |
| 121 | } |
| 122 | |
| 123 | keep_receiving = true; |
| 124 | /* Grab all available metadata. */ |
| 125 | while (keep_receiving) { |
| 126 | /* |
| 127 | * lttng_live_get_one_metadata_packet() asks the Relay Daemon |
| 128 | * for new metadata. If new metadata is received, the function |
| 129 | * writes it to the provided file handle and updates the |
| 130 | * reply_len output parameter. We call this function in loop |
| 131 | * until it returns _END meaning that no new metadata is |
| 132 | * available. |
| 133 | * We may receive a _CLOSED status if the metadata stream we |
| 134 | * are requesting is no longer available on the relay. |
| 135 | * If we receive an _ERROR status, it means there was a |
| 136 | * networking, allocating, or some other unrecoverable error. |
| 137 | */ |
| 138 | metadata_status = lttng_live_get_one_metadata_packet(trace, metadataBuf); |
| 139 | |
| 140 | switch (metadata_status) { |
| 141 | case LTTNG_LIVE_GET_ONE_METADATA_STATUS_OK: |
| 142 | break; |
| 143 | case LTTNG_LIVE_GET_ONE_METADATA_STATUS_END: |
| 144 | keep_receiving = false; |
| 145 | break; |
| 146 | case LTTNG_LIVE_GET_ONE_METADATA_STATUS_CLOSED: |
| 147 | BT_CPPLOGD_SPEC( |
| 148 | metadata->logger, |
| 149 | "Metadata stream was closed by the Relay, the trace is no longer active: " |
| 150 | "trace-id={}, metadata-stream-id={}", |
| 151 | trace->id, metadata->stream_id); |
| 152 | /* |
| 153 | * The stream was closed and we received everything |
| 154 | * there was to receive for this metadata stream. |
| 155 | * We go on with the decoding of what we received. So |
| 156 | * that data stream can be decoded. |
| 157 | */ |
| 158 | keep_receiving = false; |
| 159 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_CLOSED; |
| 160 | break; |
| 161 | case LTTNG_LIVE_GET_ONE_METADATA_STATUS_ERROR: |
| 162 | BT_CPPLOGE_APPEND_CAUSE_SPEC(metadata->logger, |
| 163 | "Error getting one trace metadata packet: trace-id={}", |
| 164 | trace->id); |
| 165 | goto error; |
| 166 | default: |
| 167 | bt_common_abort(); |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | if (metadataBuf.empty()) { |
| 172 | if (!trace->trace) { |
| 173 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 174 | goto end; |
| 175 | } |
| 176 | |
| 177 | /* The relay sent zero bytes of metadata. */ |
| 178 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_NOT_NEEDED; |
| 179 | goto end; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Open a new reading file handle on the `metadata_buf` and pass it to |
| 184 | * the metadata decoder. |
| 185 | */ |
| 186 | fp.reset(bt_fmemopen(metadataBuf.data(), metadataBuf.size(), "rb")); |
| 187 | if (!fp) { |
| 188 | if (errno == EINTR && lttng_live_graph_is_canceled(session->lttng_live_msg_iter)) { |
| 189 | session->lttng_live_msg_iter->was_interrupted = true; |
| 190 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 191 | } else { |
| 192 | BT_CPPLOGE_ERRNO_APPEND_CAUSE_SPEC(metadata->logger, |
| 193 | "Cannot memory-open metadata buffer", "."); |
| 194 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 195 | } |
| 196 | goto end; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * The call to ctf_metadata_decoder_append_content() will append |
| 201 | * new metadata to our current trace class. |
| 202 | */ |
| 203 | BT_CPPLOGD_SPEC(metadata->logger, "Appending new metadata to the ctf_trace class"); |
| 204 | decoder_status = ctf_metadata_decoder_append_content(metadata->decoder.get(), fp.get()); |
| 205 | switch (decoder_status) { |
| 206 | case CTF_METADATA_DECODER_STATUS_OK: |
| 207 | if (!trace->trace_class) { |
| 208 | struct ctf_trace_class *tc = |
| 209 | ctf_metadata_decoder_borrow_ctf_trace_class(metadata->decoder.get()); |
| 210 | |
| 211 | trace->trace_class = ctf_metadata_decoder_get_ir_trace_class(metadata->decoder.get()); |
| 212 | trace->trace = trace->trace_class->instantiate(); |
| 213 | if (!trace->trace) { |
| 214 | BT_CPPLOGE_APPEND_CAUSE_SPEC(metadata->logger, "Failed to create bt_trace"); |
| 215 | goto error; |
| 216 | } |
| 217 | if (ctf_trace_class_configure_ir_trace(tc, trace->trace->libObjPtr())) { |
| 218 | BT_CPPLOGE_APPEND_CAUSE_SPEC(metadata->logger, |
| 219 | "Failed to configure ctf trace class"); |
| 220 | goto error; |
| 221 | } |
| 222 | if (!stream_classes_all_have_default_clock_class(trace->trace_class->libObjPtr(), |
| 223 | metadata->logger)) { |
| 224 | /* Error logged in function. */ |
| 225 | goto error; |
| 226 | } |
| 227 | trace->clock_class = borrow_any_clock_class(trace->trace_class->libObjPtr()); |
| 228 | } |
| 229 | |
| 230 | /* The metadata was updated successfully. */ |
| 231 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_NOT_NEEDED; |
| 232 | |
| 233 | break; |
| 234 | default: |
| 235 | goto error; |
| 236 | } |
| 237 | |
| 238 | goto end; |
| 239 | |
| 240 | error: |
| 241 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 242 | end: |
| 243 | return status; |
| 244 | } |
| 245 | |
| 246 | int lttng_live_metadata_create_stream(struct lttng_live_session *session, uint64_t ctf_trace_id, |
| 247 | uint64_t stream_id) |
| 248 | { |
| 249 | struct lttng_live_trace *trace; |
| 250 | |
| 251 | ctf_metadata_decoder_config cfg {session->logger}; |
| 252 | cfg.self_comp = session->self_comp; |
| 253 | cfg.create_trace_class = true; |
| 254 | |
| 255 | lttng_live_metadata *metadata = new lttng_live_metadata {session->logger}; |
| 256 | metadata->stream_id = stream_id; |
| 257 | |
| 258 | metadata->decoder = ctf_metadata_decoder_create(&cfg); |
| 259 | if (!metadata->decoder) { |
| 260 | BT_CPPLOGE_APPEND_CAUSE_SPEC(session->logger, "Failed to create CTF metadata decoder"); |
| 261 | goto error; |
| 262 | } |
| 263 | trace = lttng_live_session_borrow_or_create_trace_by_id(session, ctf_trace_id); |
| 264 | if (!trace) { |
| 265 | BT_CPPLOGE_APPEND_CAUSE_SPEC(session->logger, "Failed to borrow trace"); |
| 266 | goto error; |
| 267 | } |
| 268 | trace->metadata = metadata; |
| 269 | return 0; |
| 270 | |
| 271 | error: |
| 272 | delete metadata; |
| 273 | return -1; |
| 274 | } |
| 275 | |
| 276 | void lttng_live_metadata_fini(struct lttng_live_trace *trace) |
| 277 | { |
| 278 | struct lttng_live_metadata *metadata = trace->metadata; |
| 279 | |
| 280 | if (!metadata) { |
| 281 | return; |
| 282 | } |
| 283 | trace->metadata = NULL; |
| 284 | delete metadata; |
| 285 | } |