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          * The metadata socket object is handled differently and only created
 103          * locally in this object thus it's the only reference available in the
 104          * session daemon. For that reason, a variable for the fd is required and
 105          * the metadata socket fd points to it.
 106          */
 107         int metadata_fd;
 108         struct consumer_socket metadata_sock;
 109
 110         /* consumer error and command Unix socket path */
 111         char err_unix_sock_path[PATH_MAX];
 112         char cmd_unix_sock_path[PATH_MAX];
 113
 114         /*
 115          * This lock has two purposes. It protects any change to the consumer
 116          * socket and make sure only one thread uses this object for read/write
 117          * operations.
 118          */
 119         pthread_mutex_t lock;
 120 };
 121
 122 /*
 123  * Network URIs
 124  */
 125 struct consumer_net {
 126         /*
 127          * Indicate if URI type is set. Those flags should only be set when the
 128          * created URI is done AND valid.
 129          */
 130         int control_isset;
 131         int data_isset;
 132
 133         /*
 134          * The following two URIs MUST have the same destination address for
 135          * network streaming to work. Network hop are not yet supported.
 136          */
 137
 138         /* Control path for network streaming. */
 139         struct lttng_uri control;
 140
 141         /* Data path for network streaming. */
 142         struct lttng_uri data;
 143
 144         /*
 145          * <hostname>/<session-name>
 146          */
 147         char base_dir[PATH_MAX];
 148 };
 149
 150 /*
 151  * Consumer output object describing where and how to send data.
 152  */
 153 struct consumer_output {
 154         struct urcu_ref ref;    /* Refcount */
 155
 156         /* If the consumer is enabled meaning that should be used */
 157         unsigned int enabled;
 158         enum consumer_dst_type type;
 159
 160         /*
 161          * The net_seq_index is the index of the network stream on the consumer
 162          * side. It tells the consumer which streams goes to which relayd with this
 163          * index. The relayd sockets are index with it on the consumer side.
 164          */
 165         uint64_t net_seq_index;
 166         /* Store the relay protocol in use if the session is remote. */
 167         uint32_t relay_major_version;
 168         uint32_t relay_minor_version;
 169
 170         /*
 171          * Subdirectory path name used for both local and network
 172          * consumer (/kernel or /ust).
 173          */
 174         char subdir[PATH_MAX];
 175
 176         /*
 177          * Hashtable of consumer_socket index by the file descriptor value. For
 178          * multiarch consumer support, we can have more than one consumer (ex: 32
 179          * and 64 bit).
 180          */
 181         struct lttng_ht *socks;
 182
 183         /* Tell if this output is used for snapshot. */
 184         unsigned int snapshot:1;
 185
 186         union {
 187                 char session_root_path[PATH_MAX];
 188                 struct consumer_net net;
 189         } dst;
 190
 191         /*
 192          * Sub-directory below the session_root_path where the next chunk of
 193          * trace will be stored (\0 before the first session rotation).
 194          */
 195         char chunk_path[PATH_MAX];
 196 };
 197
 198 struct consumer_socket *consumer_find_socket(int key,
 199                 struct consumer_output *consumer);
 200 struct consumer_socket *consumer_find_socket_by_bitness(int bits,
 201                 struct consumer_output *consumer);
 202 struct consumer_socket *consumer_allocate_socket(int *fd);
 203 void consumer_add_socket(struct consumer_socket *sock,
 204                 struct consumer_output *consumer);
 205 void consumer_del_socket(struct consumer_socket *sock,
 206                 struct consumer_output *consumer);
 207 void consumer_destroy_socket(struct consumer_socket *sock);
 208 int consumer_copy_sockets(struct consumer_output *dst,
 209                 struct consumer_output *src);
 210 void consumer_destroy_output_sockets(struct consumer_output *obj);
 211 int consumer_socket_send(struct consumer_socket *socket, void *msg,
 212                 size_t len);
 213 int consumer_socket_recv(struct consumer_socket *socket, void *msg,
 214                 size_t len);
 215
 216 struct consumer_output *consumer_create_output(enum consumer_dst_type type);
 217 struct consumer_output *consumer_copy_output(struct consumer_output *obj);
 218 void consumer_output_get(struct consumer_output *obj);
 219 void consumer_output_put(struct consumer_output *obj);
 220 int consumer_set_network_uri(struct consumer_output *obj,
 221                 struct lttng_uri *uri);
 222 int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd);
 223 int consumer_send_msg(struct consumer_socket *sock,
 224                 struct lttcomm_consumer_msg *msg);
 225 int consumer_send_stream(struct consumer_socket *sock,
 226                 struct consumer_output *dst, struct lttcomm_consumer_msg *msg,
 227                 int *fds, size_t nb_fd);
 228 int consumer_send_channel(struct consumer_socket *sock,
 229                 struct lttcomm_consumer_msg *msg);
 230 int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
 231                 struct lttcomm_relayd_sock *rsock, struct consumer_output *consumer,
 232                 enum lttng_stream_type type, uint64_t session_id,
 233                 char *session_name, char *hostname, int session_live_timer);
 234 int consumer_send_channel_monitor_pipe(struct consumer_socket *consumer_sock,
 235                 int pipe);
 236 int consumer_send_destroy_relayd(struct consumer_socket *sock,
 237                 struct consumer_output *consumer);
 238 int consumer_recv_status_reply(struct consumer_socket *sock);
 239 int consumer_recv_status_channel(struct consumer_socket *sock,
 240                 uint64_t *key, unsigned int *stream_count);
 241 void consumer_output_send_destroy_relayd(struct consumer_output *consumer);
 242 int consumer_create_socket(struct consumer_data *data,
 243                 struct consumer_output *output);
 244 int consumer_set_subdir(struct consumer_output *consumer,
 245                 const char *session_name);
 246
 247 void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 248                 uint64_t subbuf_size,
 249                 uint64_t num_subbuf,
 250                 int overwrite,
 251                 unsigned int switch_timer_interval,
 252                 unsigned int read_timer_interval,
 253                 unsigned int live_timer_interval,
 254                 unsigned int monitor_timer_interval,
 255                 int output,
 256                 int type,
 257                 uint64_t session_id,
 258                 const char *pathname,
 259                 const char *name,
 260                 uid_t uid,
 261                 gid_t gid,
 262                 uint64_t relayd_id,
 263                 uint64_t key,
 264                 unsigned char *uuid,
 265                 uint32_t chan_id,
 266                 uint64_t tracefile_size,
 267                 uint64_t tracefile_count,
 268                 uint64_t session_id_per_pid,
 269                 unsigned int monitor,
 270                 uint32_t ust_app_uid,
 271                 int64_t blocking_timeout,
 272                 const char *root_shm_path,
 273                 const char *shm_path);
 274 void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
 275                 enum lttng_consumer_command cmd,
 276                 uint64_t channel_key,
 277                 uint64_t stream_key,
 278                 int cpu);
 279 void consumer_init_streams_sent_comm_msg(struct lttcomm_consumer_msg *msg,
 280                 enum lttng_consumer_command cmd,
 281                 uint64_t channel_key, uint64_t net_seq_idx);
 282 void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 283                 enum lttng_consumer_command cmd,
 284                 uint64_t channel_key,
 285                 uint64_t session_id,
 286                 const char *pathname,
 287                 uid_t uid,
 288                 gid_t gid,
 289                 uint64_t relayd_id,
 290                 const char *name,
 291                 unsigned int nb_init_streams,
 292                 enum lttng_event_output output,
 293                 int type,
 294                 uint64_t tracefile_size,
 295                 uint64_t tracefile_count,
 296                 unsigned int monitor,
 297                 unsigned int live_timer_interval,
 298                 unsigned int monitor_timer_interval);
 299 int consumer_is_data_pending(uint64_t session_id,
 300                 struct consumer_output *consumer);
 301 int consumer_close_metadata(struct consumer_socket *socket,
 302                 uint64_t metadata_key);
 303 int consumer_setup_metadata(struct consumer_socket *socket,
 304                 uint64_t metadata_key);
 305 int consumer_push_metadata(struct consumer_socket *socket,
 306                 uint64_t metadata_key, char *metadata_str, size_t len,
 307                 size_t target_offset, uint64_t version);
 308 int consumer_flush_channel(struct consumer_socket *socket, uint64_t key);
 309 int consumer_clear_quiescent_channel(struct consumer_socket *socket, uint64_t key);
 310 int consumer_get_discarded_events(uint64_t session_id, uint64_t channel_key,
 311                 struct consumer_output *consumer, uint64_t *discarded);
 312 int consumer_get_lost_packets(uint64_t session_id, uint64_t channel_key,
 313                 struct consumer_output *consumer, uint64_t *lost);
 314
 315 /* Snapshot command. */
 316 int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
 317                 struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
 318                 const char *session_path, int wait, uint64_t nb_packets_per_stream);
 319
 320 #endif /* _CONSUMER_H */