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          * The metadata socket object is handled differently and only created
  98          * locally in this object thus it's the only reference available in the
  99          * session daemon. For that reason, a variable for the fd is required and
 100          * the metadata socket fd points to it.
 101          */
 102         int metadata_fd;
 103         struct consumer_socket metadata_sock;
 104
 105         /* consumer error and command Unix socket path */
 106         char err_unix_sock_path[PATH_MAX];
 107         char cmd_unix_sock_path[PATH_MAX];
 108
 109         /*
 110          * This lock has two purposes. It protects any change to the consumer
 111          * socket and make sure only one thread uses this object for read/write
 112          * operations.
 113          */
 114         pthread_mutex_t lock;
 115 };
 116
 117 /*
 118  * Network URIs
 119  */
 120 struct consumer_net {
 121         /*
 122          * Indicate if URI type is set. Those flags should only be set when the
 123          * created URI is done AND valid.
 124          */
 125         int control_isset;
 126         int data_isset;
 127
 128         /*
 129          * The following two URIs MUST have the same destination address for
 130          * network streaming to work. Network hop are not yet supported.
 131          */
 132
 133         /* Control path for network streaming. */
 134         struct lttng_uri control;
 135
 136         /* Data path for network streaming. */
 137         struct lttng_uri data;
 138 };
 139
 140 /*
 141  * Consumer output object describing where and how to send data.
 142  */
 143 struct consumer_output {
 144         struct urcu_ref ref;    /* Refcount */
 145
 146         /* If the consumer is enabled meaning that should be used */
 147         unsigned int enabled;
 148         enum consumer_dst_type type;
 149
 150         /*
 151          * The net_seq_index is the index of the network stream on the consumer
 152          * side. It tells the consumer which streams goes to which relayd with this
 153          * index. The relayd sockets are index with it on the consumer side.
 154          */
 155         uint64_t net_seq_index;
 156
 157         /*
 158          * Subdirectory path name used for both local and network consumer.
 159          */
 160         char subdir[PATH_MAX];
 161
 162         /*
 163          * Hashtable of consumer_socket index by the file descriptor value. For
 164          * multiarch consumer support, we can have more than one consumer (ex: 32
 165          * and 64 bit).
 166          */
 167         struct lttng_ht *socks;
 168
 169         /* Tell if this output is used for snapshot. */
 170         unsigned int snapshot:1;
 171
 172         union {
 173                 char trace_path[PATH_MAX];
 174                 struct consumer_net net;
 175         } dst;
 176 };
 177
 178 struct consumer_socket *consumer_find_socket(int key,
 179                 struct consumer_output *consumer);
 180 struct consumer_socket *consumer_find_socket_by_bitness(int bits,
 181                 struct consumer_output *consumer);
 182 struct consumer_socket *consumer_allocate_socket(int *fd);
 183 void consumer_add_socket(struct consumer_socket *sock,
 184                 struct consumer_output *consumer);
 185 void consumer_del_socket(struct consumer_socket *sock,
 186                 struct consumer_output *consumer);
 187 void consumer_destroy_socket(struct consumer_socket *sock);
 188 int consumer_copy_sockets(struct consumer_output *dst,
 189                 struct consumer_output *src);
 190 void consumer_destroy_output_sockets(struct consumer_output *obj);
 191 int consumer_socket_send(struct consumer_socket *socket, void *msg,
 192                 size_t len);
 193 int consumer_socket_recv(struct consumer_socket *socket, void *msg,
 194                 size_t len);
 195
 196 struct consumer_output *consumer_create_output(enum consumer_dst_type type);
 197 struct consumer_output *consumer_copy_output(struct consumer_output *obj);
 198 void consumer_output_get(struct consumer_output *obj);
 199 void consumer_output_put(struct consumer_output *obj);
 200 int consumer_set_network_uri(struct consumer_output *obj,
 201                 struct lttng_uri *uri);
 202 int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd);
 203 int consumer_send_msg(struct consumer_socket *sock,
 204                 struct lttcomm_consumer_msg *msg);
 205 int consumer_send_stream(struct consumer_socket *sock,
 206                 struct consumer_output *dst, struct lttcomm_consumer_msg *msg,
 207                 int *fds, size_t nb_fd);
 208 int consumer_send_channel(struct consumer_socket *sock,
 209                 struct lttcomm_consumer_msg *msg);
 210 int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
 211                 struct lttcomm_relayd_sock *rsock, struct consumer_output *consumer,
 212                 enum lttng_stream_type type, uint64_t session_id,
 213                 char *session_name, char *hostname, int session_live_timer);
 214 int consumer_send_destroy_relayd(struct consumer_socket *sock,
 215                 struct consumer_output *consumer);
 216 int consumer_recv_status_reply(struct consumer_socket *sock);
 217 int consumer_recv_status_channel(struct consumer_socket *sock,
 218                 uint64_t *key, unsigned int *stream_count);
 219 void consumer_output_send_destroy_relayd(struct consumer_output *consumer);
 220 int consumer_create_socket(struct consumer_data *data,
 221                 struct consumer_output *output);
 222 int consumer_set_subdir(struct consumer_output *consumer,
 223                 const char *session_name);
 224
 225 void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 226                 uint64_t subbuf_size,
 227                 uint64_t num_subbuf,
 228                 int overwrite,
 229                 unsigned int switch_timer_interval,
 230                 unsigned int read_timer_interval,
 231                 unsigned int live_timer_interval,
 232                 int output,
 233                 int type,
 234                 uint64_t session_id,
 235                 const char *pathname,
 236                 const char *name,
 237                 uid_t uid,
 238                 gid_t gid,
 239                 uint64_t relayd_id,
 240                 uint64_t key,
 241                 unsigned char *uuid,
 242                 uint32_t chan_id,
 243                 uint64_t tracefile_size,
 244                 uint64_t tracefile_count,
 245                 uint64_t session_id_per_pid,
 246                 unsigned int monitor,
 247                 uint32_t ust_app_uid,
 248                 const char *root_shm_path,
 249                 const char *shm_path);
 250 void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
 251                 enum lttng_consumer_command cmd,
 252                 uint64_t channel_key,
 253                 uint64_t stream_key,
 254                 int cpu);
 255 void consumer_init_streams_sent_comm_msg(struct lttcomm_consumer_msg *msg,
 256                 enum lttng_consumer_command cmd,
 257                 uint64_t channel_key, uint64_t net_seq_idx);
 258 void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 259                 enum lttng_consumer_command cmd,
 260                 uint64_t channel_key,
 261                 uint64_t session_id,
 262                 const char *pathname,
 263                 uid_t uid,
 264                 gid_t gid,
 265                 uint64_t relayd_id,
 266                 const char *name,
 267                 unsigned int nb_init_streams,
 268                 enum lttng_event_output output,
 269                 int type,
 270                 uint64_t tracefile_size,
 271                 uint64_t tracefile_count,
 272                 unsigned int monitor,
 273                 unsigned int live_timer_interval);
 274 int consumer_is_data_pending(uint64_t session_id,
 275                 struct consumer_output *consumer);
 276 int consumer_close_metadata(struct consumer_socket *socket,
 277                 uint64_t metadata_key);
 278 int consumer_setup_metadata(struct consumer_socket *socket,
 279                 uint64_t metadata_key);
 280 int consumer_push_metadata(struct consumer_socket *socket,
 281                 uint64_t metadata_key, char *metadata_str, size_t len,
 282                 size_t target_offset);
 283 int consumer_flush_channel(struct consumer_socket *socket, uint64_t key);
 284 int consumer_get_discarded_events(uint64_t session_id, uint64_t channel_key,
 285                 struct consumer_output *consumer, uint64_t *discarded);
 286 int consumer_get_lost_packets(uint64_t session_id, uint64_t channel_key,
 287                 struct consumer_output *consumer, uint64_t *lost);
 288
 289 /* Snapshot command. */
 290 int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
 291                 struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
 292                 const char *session_path, int wait, uint64_t nb_packets_per_stream);
 293
 294 #endif /* _CONSUMER_H */