| 1 | /* |
| 2 | * Copyright 2016 - Philippe Proulx <pproulx@efficios.com> |
| 3 | * Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * Copyright 2010-2011 - EfficiOS Inc. and Linux Foundation |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #define BT_LOG_TAG "PLUGIN-CTF-LTTNG-LIVE-SRC-DS" |
| 26 | #include "logging.h" |
| 27 | |
| 28 | #include <stdio.h> |
| 29 | #include <stdint.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <stdbool.h> |
| 32 | #include <glib.h> |
| 33 | #include <inttypes.h> |
| 34 | #include <babeltrace/compat/mman-internal.h> |
| 35 | #include <babeltrace/babeltrace.h> |
| 36 | #include "../common/notif-iter/notif-iter.h" |
| 37 | #include <babeltrace/assert-internal.h> |
| 38 | |
| 39 | #include "data-stream.h" |
| 40 | |
| 41 | static |
| 42 | enum bt_notif_iter_medium_status medop_request_bytes( |
| 43 | size_t request_sz, uint8_t **buffer_addr, |
| 44 | size_t *buffer_sz, void *data) |
| 45 | { |
| 46 | enum bt_notif_iter_medium_status status = |
| 47 | BT_NOTIF_ITER_MEDIUM_STATUS_OK; |
| 48 | struct lttng_live_stream_iterator *stream = data; |
| 49 | struct lttng_live_trace *trace = stream->trace; |
| 50 | struct lttng_live_session *session = trace->session; |
| 51 | struct lttng_live_component *lttng_live = session->lttng_live; |
| 52 | uint64_t recv_len = 0; |
| 53 | uint64_t len_left; |
| 54 | uint64_t read_len; |
| 55 | //int i; |
| 56 | |
| 57 | len_left = stream->base_offset + stream->len - stream->offset; |
| 58 | if (!len_left) { |
| 59 | stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA; |
| 60 | status = BT_NOTIF_ITER_MEDIUM_STATUS_AGAIN; |
| 61 | return status; |
| 62 | } |
| 63 | read_len = MIN(request_sz, stream->buflen); |
| 64 | read_len = MIN(read_len, len_left); |
| 65 | status = lttng_live_get_stream_bytes(lttng_live, |
| 66 | stream, stream->buf, stream->offset, |
| 67 | read_len, &recv_len); |
| 68 | *buffer_addr = stream->buf; |
| 69 | *buffer_sz = recv_len; |
| 70 | stream->offset += recv_len; |
| 71 | return status; |
| 72 | } |
| 73 | |
| 74 | static |
| 75 | struct bt_stream *medop_get_stream( |
| 76 | struct bt_stream_class *stream_class, |
| 77 | uint64_t stream_id, void *data) |
| 78 | { |
| 79 | struct lttng_live_stream_iterator *lttng_live_stream = data; |
| 80 | |
| 81 | if (!lttng_live_stream->stream) { |
| 82 | int64_t stream_class_id = |
| 83 | bt_stream_class_get_id(stream_class); |
| 84 | |
| 85 | BT_LOGD("Creating stream %s (ID: %" PRIu64 ") out of stream class %" PRId64, |
| 86 | lttng_live_stream->name, stream_id, stream_class_id); |
| 87 | |
| 88 | if (stream_id == -1ULL) { |
| 89 | /* No stream ID */ |
| 90 | lttng_live_stream->stream = bt_stream_create( |
| 91 | stream_class, lttng_live_stream->name); |
| 92 | } else { |
| 93 | lttng_live_stream->stream = |
| 94 | bt_stream_create_with_id(stream_class, |
| 95 | lttng_live_stream->name, stream_id); |
| 96 | } |
| 97 | |
| 98 | if (!lttng_live_stream->stream) { |
| 99 | BT_LOGE("Cannot create stream %s (stream class %" PRId64 ", stream ID %" PRIu64 ")", |
| 100 | lttng_live_stream->name, |
| 101 | stream_class_id, stream_id); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | return lttng_live_stream->stream; |
| 106 | } |
| 107 | |
| 108 | static struct bt_notif_iter_medium_ops medops = { |
| 109 | .request_bytes = medop_request_bytes, |
| 110 | .get_stream = medop_get_stream, |
| 111 | }; |
| 112 | |
| 113 | BT_HIDDEN |
| 114 | enum bt_lttng_live_iterator_status lttng_live_lazy_notif_init( |
| 115 | struct lttng_live_session *session) |
| 116 | { |
| 117 | struct lttng_live_component *lttng_live = session->lttng_live; |
| 118 | struct lttng_live_trace *trace; |
| 119 | |
| 120 | if (!session->lazy_stream_notif_init) { |
| 121 | return BT_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 122 | } |
| 123 | |
| 124 | bt_list_for_each_entry(trace, &session->traces, node) { |
| 125 | struct lttng_live_stream_iterator *stream; |
| 126 | |
| 127 | bt_list_for_each_entry(stream, &trace->streams, node) { |
| 128 | if (stream->notif_iter) { |
| 129 | continue; |
| 130 | } |
| 131 | stream->notif_iter = bt_notif_iter_create(trace->trace, |
| 132 | lttng_live->max_query_size, medops, |
| 133 | stream); |
| 134 | if (!stream->notif_iter) { |
| 135 | goto error; |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | session->lazy_stream_notif_init = false; |
| 141 | |
| 142 | return BT_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 143 | |
| 144 | error: |
| 145 | return BT_LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 146 | } |
| 147 | |
| 148 | BT_HIDDEN |
| 149 | struct lttng_live_stream_iterator *lttng_live_stream_iterator_create( |
| 150 | struct lttng_live_session *session, |
| 151 | uint64_t ctf_trace_id, |
| 152 | uint64_t stream_id) |
| 153 | { |
| 154 | struct lttng_live_component *lttng_live = session->lttng_live; |
| 155 | struct lttng_live_stream_iterator *stream = |
| 156 | g_new0(struct lttng_live_stream_iterator, 1); |
| 157 | struct lttng_live_trace *trace; |
| 158 | int ret; |
| 159 | |
| 160 | trace = lttng_live_ref_trace(session, ctf_trace_id); |
| 161 | if (!trace) { |
| 162 | goto error; |
| 163 | } |
| 164 | |
| 165 | stream->p.type = LIVE_STREAM_TYPE_STREAM; |
| 166 | stream->trace = trace; |
| 167 | stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA; |
| 168 | stream->viewer_stream_id = stream_id; |
| 169 | stream->ctf_stream_class_id = -1ULL; |
| 170 | stream->last_returned_inactivity_timestamp = INT64_MIN; |
| 171 | |
| 172 | if (trace->trace) { |
| 173 | stream->notif_iter = bt_notif_iter_create(trace->trace, |
| 174 | lttng_live->max_query_size, medops, |
| 175 | stream); |
| 176 | if (!stream->notif_iter) { |
| 177 | goto error; |
| 178 | } |
| 179 | } |
| 180 | stream->buf = g_new0(uint8_t, session->lttng_live->max_query_size); |
| 181 | stream->buflen = session->lttng_live->max_query_size; |
| 182 | |
| 183 | ret = lttng_live_add_port(lttng_live, stream); |
| 184 | BT_ASSERT(!ret); |
| 185 | |
| 186 | bt_list_add(&stream->node, &trace->streams); |
| 187 | |
| 188 | goto end; |
| 189 | error: |
| 190 | /* Do not touch "borrowed" file. */ |
| 191 | lttng_live_stream_iterator_destroy(stream); |
| 192 | stream = NULL; |
| 193 | end: |
| 194 | return stream; |
| 195 | } |
| 196 | |
| 197 | BT_HIDDEN |
| 198 | void lttng_live_stream_iterator_destroy(struct lttng_live_stream_iterator *stream) |
| 199 | { |
| 200 | struct lttng_live_component *lttng_live; |
| 201 | int ret; |
| 202 | |
| 203 | if (!stream) { |
| 204 | return; |
| 205 | } |
| 206 | |
| 207 | lttng_live = stream->trace->session->lttng_live; |
| 208 | ret = lttng_live_remove_port(lttng_live, stream->port); |
| 209 | BT_ASSERT(!ret); |
| 210 | |
| 211 | if (stream->stream) { |
| 212 | BT_PUT(stream->stream); |
| 213 | } |
| 214 | |
| 215 | if (stream->notif_iter) { |
| 216 | bt_notif_iter_destroy(stream->notif_iter); |
| 217 | } |
| 218 | g_free(stream->buf); |
| 219 | BT_PUT(stream->packet_end_notif_queue); |
| 220 | bt_list_del(&stream->node); |
| 221 | /* |
| 222 | * Ensure we poke the trace metadata in the future, which is |
| 223 | * required to release the metadata reference on the trace. |
| 224 | */ |
| 225 | stream->trace->new_metadata_needed = true; |
| 226 | lttng_live_unref_trace(stream->trace); |
| 227 | g_free(stream); |
| 228 | } |