src/bin/lttng-sessiond/condition-internal.c

   1 /*
   2  * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #include <common/hashtable/utils.h>
   9 #include <common/hashtable/hashtable.h>
  10
  11 #include <lttng/condition/condition.h>
  12 #include <lttng/condition/condition-internal.h>
  13 #include <lttng/condition/buffer-usage-internal.h>
  14 #include <lttng/condition/session-consumed-size-internal.h>
  15 #include <lttng/condition/session-rotation-internal.h>
  16 #include <lttng/condition/event-rule-internal.h>
  17 #include "condition-internal.h"
  18
  19 static
  20 unsigned long lttng_condition_buffer_usage_hash(
  21         const struct lttng_condition *_condition)
  22 {
  23         unsigned long hash;
  24         unsigned long condition_type;
  25         struct lttng_condition_buffer_usage *condition;
  26
  27         condition = container_of(_condition,
  28                         struct lttng_condition_buffer_usage, parent);
  29
  30         condition_type = (unsigned long) condition->parent.type;
  31         hash = hash_key_ulong((void *) condition_type, lttng_ht_seed);
  32         if (condition->session_name) {
  33                 hash ^= hash_key_str(condition->session_name, lttng_ht_seed);
  34         }
  35         if (condition->channel_name) {
  36                 hash ^= hash_key_str(condition->channel_name, lttng_ht_seed);
  37         }
  38         if (condition->domain.set) {
  39                 hash ^= hash_key_ulong(
  40                                 (void *) condition->domain.type,
  41                                 lttng_ht_seed);
  42         }
  43         if (condition->threshold_ratio.set) {
  44                 uint64_t val;
  45
  46                 val = condition->threshold_ratio.value * (double) UINT32_MAX;
  47                 hash ^= hash_key_u64(&val, lttng_ht_seed);
  48         } else if (condition->threshold_bytes.set) {
  49                 uint64_t val;
  50
  51                 val = condition->threshold_bytes.value;
  52                 hash ^= hash_key_u64(&val, lttng_ht_seed);
  53         }
  54         return hash;
  55 }
  56
  57 static
  58 unsigned long lttng_condition_session_consumed_size_hash(
  59         const struct lttng_condition *_condition)
  60 {
  61         unsigned long hash;
  62         unsigned long condition_type =
  63                         (unsigned long) LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE;
  64         struct lttng_condition_session_consumed_size *condition;
  65         uint64_t val;
  66
  67         condition = container_of(_condition,
  68                         struct lttng_condition_session_consumed_size, parent);
  69
  70         hash = hash_key_ulong((void *) condition_type, lttng_ht_seed);
  71         if (condition->session_name) {
  72                 hash ^= hash_key_str(condition->session_name, lttng_ht_seed);
  73         }
  74         val = condition->consumed_threshold_bytes.value;
  75         hash ^= hash_key_u64(&val, lttng_ht_seed);
  76         return hash;
  77 }
  78
  79 static
  80 unsigned long lttng_condition_session_rotation_hash(
  81         const struct lttng_condition *_condition)
  82 {
  83         unsigned long hash, condition_type;
  84         struct lttng_condition_session_rotation *condition;
  85
  86         condition = container_of(_condition,
  87                         struct lttng_condition_session_rotation, parent);
  88         condition_type = (unsigned long) condition->parent.type;
  89         hash = hash_key_ulong((void *) condition_type, lttng_ht_seed);
  90         assert(condition->session_name);
  91         hash ^= hash_key_str(condition->session_name, lttng_ht_seed);
  92         return hash;
  93 }
  94
  95 static
  96 unsigned long lttng_condition_event_rule_hash(
  97         const struct lttng_condition *_condition)
  98 {
  99         unsigned long hash, condition_type;
 100         struct lttng_condition_event_rule *condition;
 101
 102         condition = container_of(_condition,
 103                         struct lttng_condition_event_rule, parent);
 104         condition_type = (unsigned long) condition->parent.type;
 105         hash = hash_key_ulong((void *) condition_type, lttng_ht_seed);
 106
 107         /* TODO: further hasg using the event rule? on pattern maybe?*/
 108         return hash;
 109 }
 110
 111 /*
 112  * The lttng_condition hashing code is kept in this file (rather than
 113  * condition.c) since it makes use of GPLv2 code (hashtable utils), which we
 114  * don't want to link in liblttng-ctl.
 115  */
 116 unsigned long lttng_condition_hash(const struct lttng_condition *condition)
 117 {
 118         switch (condition->type) {
 119         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
 120         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
 121                 return lttng_condition_buffer_usage_hash(condition);
 122         case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
 123                 return lttng_condition_session_consumed_size_hash(condition);
 124         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
 125         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
 126                 return lttng_condition_session_rotation_hash(condition);
 127         case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT:
 128                 return lttng_condition_event_rule_hash(condition);
 129         default:
 130                 //ERR("[notification-thread] Unexpected condition type caught");
 131                 abort();
 132         }
 133 }