src/bin/lttng-sessiond/consumer.h

   1 /*
   2  * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef _CONSUMER_H
  19 #define _CONSUMER_H
  20
  21 #include <common/consumer/consumer.h>
  22 #include <common/hashtable/hashtable.h>
  23 #include <lttng/lttng.h>
  24 #include <urcu/ref.h>
  25
  26 #include "snapshot.h"
  27
  28 struct snapshot;
  29 struct snapshot_output;
  30
  31 enum consumer_dst_type {
  32         CONSUMER_DST_LOCAL,
  33         CONSUMER_DST_NET,
  34 };
  35
  36 struct consumer_socket {
  37         /*
  38          * File descriptor. This is just a reference to the consumer data meaning
  39          * that every access must be locked and checked for a possible invalid
  40          * value.
  41          */
  42         int *fd_ptr;
  43
  44         /*
  45          * To use this socket (send/recv), this lock MUST be acquired.
  46          */
  47         pthread_mutex_t *lock;
  48
  49         /*
  50          * Indicates if the socket was registered by a third part
  51          * (REGISTER_CONSUMER) or is the spawn consumer of the session daemon.
  52          * During the destroy phase of a consumer output, we close the socket if
  53          * this flag is set to 1 since we don't need the fd anymore.
  54          */
  55         unsigned int registered;
  56
  57         /* Flag if network sockets were sent to the consumer. */
  58         unsigned int control_sock_sent;
  59         unsigned int data_sock_sent;
  60
  61         struct lttng_ht_node_ulong node;
  62
  63         enum lttng_consumer_type type;
  64 };
  65
  66 struct consumer_data {
  67         enum lttng_consumer_type type;
  68
  69         pthread_t thread;       /* Worker thread interacting with the consumer */
  70
  71         /* Conditions used by the consumer thread to indicate readiness. */
  72         pthread_cond_t cond;
  73         pthread_condattr_t condattr;
  74         pthread_mutex_t cond_mutex;
  75
  76         /*
  77          * This is a flag condition indicating that the consumer thread is ready
  78          * and connected to the lttng-consumerd daemon. This flag MUST only be
  79          * updated by locking the condition mutex above or before spawning a
  80          * consumer thread.
  81          *
  82          * A value of 0 means that the thread is NOT ready. A value of 1 means that
  83          * the thread consumer did connect successfully to the lttng-consumerd
  84          * daemon. A negative value indicates that there is been an error and the
  85          * thread has likely quit.
  86          */
  87         int consumer_thread_is_ready;
  88
  89         /* Mutex to control consumerd pid assignation */
  90         pthread_mutex_t pid_mutex;
  91         pid_t pid;
  92
  93         int err_sock;
  94         /* These two sockets uses the cmd_unix_sock_path. */
  95         int cmd_sock;
  96         /*
  97          * Write-end of the channel monitoring pipe to be passed to the
  98          * consumer.
  99          */
 100         int channel_monitor_pipe;
 101         /*
 102          * Write-end of the channel rotation pipe to be passed to the
 103          * consumer.
 104          */
 105         int channel_rotate_pipe;
 106         /*
 107          * The metadata socket object is handled differently and only created
 108          * locally in this object thus it's the only reference available in the
 109          * session daemon. For that reason, a variable for the fd is required and
 110          * the metadata socket fd points to it.
 111          */
 112         int metadata_fd;
 113         struct consumer_socket metadata_sock;
 114
 115         /* consumer error and command Unix socket path */
 116         const char *err_unix_sock_path;
 117         const char *cmd_unix_sock_path;
 118
 119         /*
 120          * This lock has two purposes. It protects any change to the consumer
 121          * socket and make sure only one thread uses this object for read/write
 122          * operations.
 123          */
 124         pthread_mutex_t lock;
 125 };
 126
 127 /*
 128  * Network URIs
 129  */
 130 struct consumer_net {
 131         /*
 132          * Indicate if URI type is set. Those flags should only be set when the
 133          * created URI is done AND valid.
 134          */
 135         int control_isset;
 136         int data_isset;
 137
 138         /*
 139          * The following two URIs MUST have the same destination address for
 140          * network streaming to work. Network hop are not yet supported.
 141          */
 142
 143         /* Control path for network streaming. */
 144         struct lttng_uri control;
 145
 146         /* Data path for network streaming. */
 147         struct lttng_uri data;
 148
 149         /* <hostname>/<session-name> */
 150         char base_dir[PATH_MAX];
 151 };
 152
 153 /*
 154  * Consumer output object describing where and how to send data.
 155  */
 156 struct consumer_output {
 157         struct urcu_ref ref;    /* Refcount */
 158
 159         /* If the consumer is enabled meaning that should be used */
 160         unsigned int enabled;
 161         enum consumer_dst_type type;
 162
 163         /*
 164          * The net_seq_index is the index of the network stream on the consumer
 165          * side. It tells the consumer which streams goes to which relayd with this
 166          * index. The relayd sockets are index with it on the consumer side.
 167          */
 168         uint64_t net_seq_index;
 169         /* Store the relay protocol in use if the session is remote. */
 170         uint32_t relay_major_version;
 171         uint32_t relay_minor_version;
 172
 173         /*
 174          * Subdirectory path name used for both local and network
 175          * consumer (/kernel or /ust).
 176          */
 177         char subdir[LTTNG_PATH_MAX];
 178
 179         /*
 180          * Hashtable of consumer_socket index by the file descriptor value. For
 181          * multiarch consumer support, we can have more than one consumer (ex: 32
 182          * and 64 bit).
 183          */
 184         struct lttng_ht *socks;
 185
 186         /* Tell if this output is used for snapshot. */
 187         unsigned int snapshot:1;
 188
 189         union {
 190                 char session_root_path[LTTNG_PATH_MAX];
 191                 struct consumer_net net;
 192         } dst;
 193
 194         /*
 195          * Sub-directory below the session_root_path where the next chunk of
 196          * trace will be stored (\0 before the first session rotation).
 197          */
 198         char chunk_path[LTTNG_PATH_MAX];
 199 };
 200
 201 struct consumer_socket *consumer_find_socket(int key,
 202                 struct consumer_output *consumer);
 203 struct consumer_socket *consumer_find_socket_by_bitness(int bits,
 204                 struct consumer_output *consumer);
 205 struct consumer_socket *consumer_allocate_socket(int *fd);
 206 void consumer_add_socket(struct consumer_socket *sock,
 207                 struct consumer_output *consumer);
 208 void consumer_del_socket(struct consumer_socket *sock,
 209                 struct consumer_output *consumer);
 210 void consumer_destroy_socket(struct consumer_socket *sock);
 211 int consumer_copy_sockets(struct consumer_output *dst,
 212                 struct consumer_output *src);
 213 void consumer_destroy_output_sockets(struct consumer_output *obj);
 214 int consumer_socket_send(struct consumer_socket *socket, void *msg,
 215                 size_t len);
 216 int consumer_socket_recv(struct consumer_socket *socket, void *msg,
 217                 size_t len);
 218
 219 struct consumer_output *consumer_create_output(enum consumer_dst_type type);
 220 struct consumer_output *consumer_copy_output(struct consumer_output *obj);
 221 void consumer_output_get(struct consumer_output *obj);
 222 void consumer_output_put(struct consumer_output *obj);
 223 int consumer_set_network_uri(struct consumer_output *obj,
 224                 struct lttng_uri *uri);
 225 int consumer_send_fds(struct consumer_socket *sock, const int *fds,
 226                 size_t nb_fd);
 227 int consumer_send_msg(struct consumer_socket *sock,
 228                 struct lttcomm_consumer_msg *msg);
 229 int consumer_send_stream(struct consumer_socket *sock,
 230                 struct consumer_output *dst, struct lttcomm_consumer_msg *msg,
 231                 const int *fds, size_t nb_fd);
 232 int consumer_send_channel(struct consumer_socket *sock,
 233                 struct lttcomm_consumer_msg *msg);
 234 int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
 235                 struct lttcomm_relayd_sock *rsock, struct consumer_output *consumer,
 236                 enum lttng_stream_type type, uint64_t session_id,
 237                 char *session_name, char *hostname, int session_live_timer);
 238 int consumer_send_channel_monitor_pipe(struct consumer_socket *consumer_sock,
 239                 int pipe);
 240 int consumer_send_channel_rotate_pipe(struct consumer_socket *consumer_sock,
 241                 int pipe);
 242 int consumer_send_destroy_relayd(struct consumer_socket *sock,
 243                 struct consumer_output *consumer);
 244 int consumer_recv_status_reply(struct consumer_socket *sock);
 245 int consumer_recv_status_channel(struct consumer_socket *sock,
 246                 uint64_t *key, unsigned int *stream_count);
 247 void consumer_output_send_destroy_relayd(struct consumer_output *consumer);
 248 int consumer_create_socket(struct consumer_data *data,
 249                 struct consumer_output *output);
 250 int consumer_set_subdir(struct consumer_output *consumer,
 251                 const char *session_name);
 252
 253 void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 254                 uint64_t subbuf_size,
 255                 uint64_t num_subbuf,
 256                 int overwrite,
 257                 unsigned int switch_timer_interval,
 258                 unsigned int read_timer_interval,
 259                 unsigned int live_timer_interval,
 260                 unsigned int monitor_timer_interval,
 261                 int output,
 262                 int type,
 263                 uint64_t session_id,
 264                 const char *pathname,
 265                 const char *name,
 266                 uid_t uid,
 267                 gid_t gid,
 268                 uint64_t relayd_id,
 269                 uint64_t key,
 270                 unsigned char *uuid,
 271                 uint32_t chan_id,
 272                 uint64_t tracefile_size,
 273                 uint64_t tracefile_count,
 274                 uint64_t session_id_per_pid,
 275                 unsigned int monitor,
 276                 uint32_t ust_app_uid,
 277                 int64_t blocking_timeout,
 278                 const char *root_shm_path,
 279                 const char *shm_path);
 280 void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
 281                 enum lttng_consumer_command cmd,
 282                 uint64_t channel_key,
 283                 uint64_t stream_key,
 284                 int cpu);
 285 void consumer_init_streams_sent_comm_msg(struct lttcomm_consumer_msg *msg,
 286                 enum lttng_consumer_command cmd,
 287                 uint64_t channel_key, uint64_t net_seq_idx);
 288 void consumer_init_add_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 289                 uint64_t channel_key,
 290                 uint64_t session_id,
 291                 const char *pathname,
 292                 uid_t uid,
 293                 gid_t gid,
 294                 uint64_t relayd_id,
 295                 const char *name,
 296                 unsigned int nb_init_streams,
 297                 enum lttng_event_output output,
 298                 int type,
 299                 uint64_t tracefile_size,
 300                 uint64_t tracefile_count,
 301                 unsigned int monitor,
 302                 unsigned int live_timer_interval,
 303                 unsigned int monitor_timer_interval);
 304 int consumer_is_data_pending(uint64_t session_id,
 305                 struct consumer_output *consumer);
 306 int consumer_close_metadata(struct consumer_socket *socket,
 307                 uint64_t metadata_key);
 308 int consumer_setup_metadata(struct consumer_socket *socket,
 309                 uint64_t metadata_key);
 310 int consumer_push_metadata(struct consumer_socket *socket,
 311                 uint64_t metadata_key, char *metadata_str, size_t len,
 312                 size_t target_offset, uint64_t version);
 313 int consumer_flush_channel(struct consumer_socket *socket, uint64_t key);
 314 int consumer_clear_quiescent_channel(struct consumer_socket *socket, uint64_t key);
 315 int consumer_get_discarded_events(uint64_t session_id, uint64_t channel_key,
 316                 struct consumer_output *consumer, uint64_t *discarded);
 317 int consumer_get_lost_packets(uint64_t session_id, uint64_t channel_key,
 318                 struct consumer_output *consumer, uint64_t *lost);
 319
 320 /* Snapshot command. */
 321 int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
 322                 struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
 323                 const char *session_path, int wait, uint64_t nb_packets_per_stream);
 324
 325 int consumer_rotate_channel(struct consumer_socket *socket, uint64_t key,
 326                 uid_t uid, gid_t gid, struct consumer_output *output,
 327                 char *domain_path, bool is_metadata_channel, uint64_t new_chunk_id,
 328                 bool *rotate_pending_relay);
 329 int consumer_rotate_rename(struct consumer_socket *socket, uint64_t session_id,
 330                 const struct consumer_output *output, const char *old_path,
 331                 const char *new_path, uid_t uid, gid_t gid);
 332 int consumer_rotate_pending_relay(struct consumer_socket *socket,
 333                 struct consumer_output *output, uint64_t session_id,
 334                 uint64_t chunk_id);
 335 int consumer_mkdir(struct consumer_socket *socket, uint64_t session_id,
 336                 const struct consumer_output *output, const char *path,
 337                 uid_t uid, gid_t gid);
 338
 339 #endif /* _CONSUMER_H */