2 * SPDX-License-Identifier: MIT
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
14 #include <babeltrace2/babeltrace.h>
16 #define BT_COMP_LOG_SELF_COMP self_comp
17 #define BT_LOG_OUTPUT_LEVEL log_level
18 #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/META"
19 #include "logging/comp-logging.h"
21 #include "compat/memstream.h"
23 #include "../common/src/metadata/tsdl/ctf-meta-configure-ir-trace.hpp"
24 #include "../common/src/metadata/tsdl/decoder.hpp"
25 #include "lttng-live.hpp"
26 #include "metadata.hpp"
28 #define TSDL_MAGIC 0x75d11d57
35 uint32_t content_size
;
37 uint8_t compression_scheme
;
38 uint8_t encryption_scheme
;
39 uint8_t checksum_scheme
;
42 } __attribute__((__packed__
));
44 static bool stream_classes_all_have_default_clock_class(bt_trace_class
*tc
,
45 bt_logging_level log_level
,
46 bt_self_component
*self_comp
)
49 const bt_clock_class
*cc
= NULL
;
50 const bt_stream_class
*sc
;
53 sc_count
= bt_trace_class_get_stream_class_count(tc
);
54 for (i
= 0; i
< sc_count
; i
++) {
55 sc
= bt_trace_class_borrow_stream_class_by_index_const(tc
, i
);
59 cc
= bt_stream_class_borrow_default_clock_class_const(sc
);
62 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
63 "Stream class doesn't have a default clock class: "
64 "sc-id=%" PRIu64
", sc-name=\"%s\"",
65 bt_stream_class_get_id(sc
), bt_stream_class_get_name(sc
));
74 * Iterate over the stream classes and returns the first clock class
75 * encountered. This is useful to create message iterator inactivity message as
76 * we don't need a particular clock class.
78 static const bt_clock_class
*borrow_any_clock_class(bt_trace_class
*tc
)
81 const bt_clock_class
*cc
= NULL
;
82 const bt_stream_class
*sc
;
84 sc_count
= bt_trace_class_get_stream_class_count(tc
);
85 for (i
= 0; i
< sc_count
; i
++) {
86 sc
= bt_trace_class_borrow_stream_class_by_index_const(tc
, i
);
89 cc
= bt_stream_class_borrow_default_clock_class_const(sc
);
99 enum lttng_live_iterator_status
lttng_live_metadata_update(struct lttng_live_trace
*trace
)
101 struct lttng_live_session
*session
= trace
->session
;
102 struct lttng_live_metadata
*metadata
= trace
->metadata
;
103 size_t size
, len_read
= 0;
104 char *metadata_buf
= NULL
;
107 enum ctf_metadata_decoder_status decoder_status
;
108 enum lttng_live_iterator_status status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
109 bt_logging_level log_level
= trace
->log_level
;
110 bt_self_component
*self_comp
= trace
->self_comp
;
111 enum lttng_live_get_one_metadata_status metadata_status
;
113 BT_COMP_LOGD("Updating metadata for trace: session-id=%" PRIu64
", trace-id=%" PRIu64
,
114 session
->id
, trace
->id
);
116 /* No metadata stream yet. */
118 if (session
->closed
) {
120 * The session is closed AND we never received any
121 * metadata this indicates that we will never receive
124 status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
125 } else if (session
->new_streams_needed
) {
126 status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
128 session
->new_streams_needed
= true;
129 status
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
134 if (trace
->metadata_stream_state
!= LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED
) {
139 * Open a new write only file handle to populate the `metadata_buf`
140 * memory buffer so we can write in loop in it easily.
142 fp
= bt_open_memstream(&metadata_buf
, &size
);
144 if (errno
== EINTR
&& lttng_live_graph_is_canceled(session
->lttng_live_msg_iter
)) {
145 session
->lttng_live_msg_iter
->was_interrupted
= true;
146 status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
148 BT_COMP_LOGE_APPEND_CAUSE_ERRNO(self_comp
, "Metadata open_memstream", ".");
149 status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
154 keep_receiving
= true;
155 /* Grab all available metadata. */
156 while (keep_receiving
) {
157 size_t reply_len
= 0;
159 * lttng_live_get_one_metadata_packet() asks the Relay Daemon
160 * for new metadata. If new metadata is received, the function
161 * writes it to the provided file handle and updates the
162 * reply_len output parameter. We call this function in loop
163 * until it returns _END meaning that no new metadata is
165 * We may receive a _CLOSED status if the metadata stream we
166 * are requesting is no longer available on the relay.
167 * If we receive an _ERROR status, it means there was a
168 * networking, allocating, or some other unrecoverable error.
170 metadata_status
= lttng_live_get_one_metadata_packet(trace
, fp
, &reply_len
);
172 switch (metadata_status
) {
173 case LTTNG_LIVE_GET_ONE_METADATA_STATUS_OK
:
174 len_read
+= reply_len
;
176 case LTTNG_LIVE_GET_ONE_METADATA_STATUS_END
:
177 keep_receiving
= false;
179 case LTTNG_LIVE_GET_ONE_METADATA_STATUS_CLOSED
:
180 BT_COMP_LOGD("Metadata stream was closed by the Relay, the trace is no longer active: "
181 "trace-id=%" PRIu64
", metadata-stream-id=%" PRIu64
,
182 trace
->id
, metadata
->stream_id
);
184 * The stream was closed and we received everything
185 * there was to receive for this metadata stream.
186 * We go on with the decoding of what we received. So
187 * that data stream can be decoded.
189 keep_receiving
= false;
190 trace
->metadata_stream_state
= LTTNG_LIVE_METADATA_STREAM_STATE_CLOSED
;
192 case LTTNG_LIVE_GET_ONE_METADATA_STATUS_ERROR
:
193 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
194 "Error getting one trace metadata packet: "
203 /* The memory buffer `metadata_buf` contains all the metadata. */
204 if (bt_close_memstream(&metadata_buf
, &size
, fp
)) {
205 BT_COMP_LOGW_ERRNO("Metadata bt_close_memstream", ".");
212 status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
216 /* The relay sent zero bytes of metadata. */
217 trace
->metadata_stream_state
= LTTNG_LIVE_METADATA_STREAM_STATE_NOT_NEEDED
;
222 * Open a new reading file handle on the `metadata_buf` and pass it to
223 * the metadata decoder.
225 fp
= bt_fmemopen(metadata_buf
, len_read
, "rb");
227 if (errno
== EINTR
&& lttng_live_graph_is_canceled(session
->lttng_live_msg_iter
)) {
228 session
->lttng_live_msg_iter
->was_interrupted
= true;
229 status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
231 BT_COMP_LOGE_APPEND_CAUSE_ERRNO(self_comp
, "Cannot memory-open metadata buffer", ".");
232 status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
238 * The call to ctf_metadata_decoder_append_content() will append
239 * new metadata to our current trace class.
241 BT_COMP_LOGD("Appending new metadata to the ctf_trace class");
242 decoder_status
= ctf_metadata_decoder_append_content(metadata
->decoder
, fp
);
243 switch (decoder_status
) {
244 case CTF_METADATA_DECODER_STATUS_OK
:
245 if (!trace
->trace_class
) {
246 struct ctf_trace_class
*tc
=
247 ctf_metadata_decoder_borrow_ctf_trace_class(metadata
->decoder
);
249 trace
->trace_class
= ctf_metadata_decoder_get_ir_trace_class(metadata
->decoder
);
250 trace
->trace
= bt_trace_create(trace
->trace_class
);
252 BT_COMP_LOGE_APPEND_CAUSE(self_comp
, "Failed to create bt_trace");
255 if (ctf_trace_class_configure_ir_trace(tc
, trace
->trace
)) {
256 BT_COMP_LOGE_APPEND_CAUSE(self_comp
, "Failed to configure ctf trace class");
259 if (!stream_classes_all_have_default_clock_class(trace
->trace_class
, log_level
,
261 /* Error logged in function. */
264 trace
->clock_class
= borrow_any_clock_class(trace
->trace_class
);
267 /* The metadata was updated successfully. */
268 trace
->metadata_stream_state
= LTTNG_LIVE_METADATA_STREAM_STATE_NOT_NEEDED
;
278 status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
283 closeret
= fclose(fp
);
285 BT_COMP_LOGW_ERRNO("Error on fclose", ".");
292 int lttng_live_metadata_create_stream(struct lttng_live_session
*session
, uint64_t ctf_trace_id
,
295 bt_self_component
*self_comp
= session
->self_comp
;
296 bt_logging_level log_level
= session
->log_level
;
297 struct lttng_live_trace
*trace
;
299 ctf_metadata_decoder_config cfg
;
300 cfg
.log_level
= session
->log_level
;
301 cfg
.self_comp
= session
->self_comp
;
302 cfg
.clock_class_offset_s
= 0;
303 cfg
.clock_class_offset_ns
= 0;
304 cfg
.create_trace_class
= true;
306 lttng_live_metadata
*metadata
= new lttng_live_metadata
;
307 metadata
->log_level
= session
->log_level
;
308 metadata
->self_comp
= session
->self_comp
;
309 metadata
->stream_id
= stream_id
;
311 metadata
->decoder
= ctf_metadata_decoder_create(&cfg
);
312 if (!metadata
->decoder
) {
313 BT_COMP_LOGE_APPEND_CAUSE(self_comp
, "Failed to create CTF metadata decoder");
316 trace
= lttng_live_session_borrow_or_create_trace_by_id(session
, ctf_trace_id
);
318 BT_COMP_LOGE_APPEND_CAUSE(self_comp
, "Failed to borrow trace");
321 trace
->metadata
= metadata
;
325 ctf_metadata_decoder_destroy(metadata
->decoder
);
330 void lttng_live_metadata_fini(struct lttng_live_trace
*trace
)
332 struct lttng_live_metadata
*metadata
= trace
->metadata
;
337 ctf_metadata_decoder_destroy(metadata
->decoder
);
338 trace
->metadata
= NULL
;