src/common/evaluation.c

   1 /*
   2  * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #include <lttng/condition/condition-internal.h>
   9 #include <lttng/condition/evaluation-internal.h>
  10 #include <lttng/condition/buffer-usage-internal.h>
  11 #include <lttng/condition/session-consumed-size-internal.h>
  12 #include <lttng/condition/session-rotation-internal.h>
  13 #include <lttng/condition/event-rule-internal.h>
  14 #include <common/macros.h>
  15 #include <common/error.h>
  16 #include <stdbool.h>
  17 #include <assert.h>
  18
  19 LTTNG_HIDDEN
  20 void lttng_evaluation_init(struct lttng_evaluation *evaluation,
  21                 enum lttng_condition_type type)
  22 {
  23         evaluation->type = type;
  24 }
  25
  26 LTTNG_HIDDEN
  27 int lttng_evaluation_serialize(const struct lttng_evaluation *evaluation,
  28                 struct lttng_dynamic_buffer *buf)
  29 {
  30         int ret;
  31         struct lttng_evaluation_comm evaluation_comm = {
  32                 .type = (int8_t) evaluation->type
  33         };
  34
  35         ret = lttng_dynamic_buffer_append(buf, &evaluation_comm,
  36                         sizeof(evaluation_comm));
  37         if (ret) {
  38                 goto end;
  39         }
  40
  41         if (evaluation->serialize) {
  42                 ret = evaluation->serialize(evaluation, buf);
  43                 if (ret) {
  44                         goto end;
  45                 }
  46         }
  47 end:
  48         return ret;
  49 }
  50
  51 LTTNG_HIDDEN
  52 ssize_t lttng_evaluation_create_from_buffer(
  53                 const struct lttng_condition *condition,
  54                 const struct lttng_buffer_view *src_view,
  55                 struct lttng_evaluation **evaluation)
  56 {
  57         ssize_t ret, evaluation_size = 0;
  58         const struct lttng_evaluation_comm *evaluation_comm;
  59         const struct lttng_buffer_view evaluation_view =
  60                         lttng_buffer_view_from_view(src_view,
  61                         sizeof(*evaluation_comm), -1);
  62
  63         if (!src_view || !evaluation) {
  64                 ret = -1;
  65                 goto end;
  66         }
  67
  68         evaluation_comm = (const struct lttng_evaluation_comm *) src_view->data;
  69         evaluation_size += sizeof(*evaluation_comm);
  70
  71         switch ((enum lttng_condition_type) evaluation_comm->type) {
  72         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
  73                 ret = lttng_evaluation_buffer_usage_low_create_from_buffer(
  74                                 &evaluation_view, evaluation);
  75                 if (ret < 0) {
  76                         goto end;
  77                 }
  78                 evaluation_size += ret;
  79                 break;
  80         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
  81                 ret = lttng_evaluation_buffer_usage_high_create_from_buffer(
  82                                 &evaluation_view, evaluation);
  83                 if (ret < 0) {
  84                         goto end;
  85                 }
  86                 evaluation_size += ret;
  87                 break;
  88         case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
  89                 ret = lttng_evaluation_session_consumed_size_create_from_buffer(
  90                                 &evaluation_view, evaluation);
  91                 if (ret < 0) {
  92                         goto end;
  93                 }
  94                 evaluation_size += ret;
  95                 break;
  96         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
  97                 ret = lttng_evaluation_session_rotation_ongoing_create_from_buffer(
  98                                 &evaluation_view, evaluation);
  99                 if (ret < 0) {
 100                         goto end;
 101                 }
 102                 evaluation_size += ret;
 103                 break;
 104         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
 105                 ret = lttng_evaluation_session_rotation_completed_create_from_buffer(
 106                                 &evaluation_view, evaluation);
 107                 if (ret < 0) {
 108                         goto end;
 109                 }
 110                 evaluation_size += ret;
 111                 break;
 112         case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT:
 113                 assert(condition);
 114                 assert(condition->type == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT);
 115                 ret = lttng_evaluation_event_rule_create_from_buffer(
 116                                 container_of(condition,
 117                                         struct lttng_condition_event_rule,
 118                                         parent),
 119                                 &evaluation_view, evaluation);
 120                 if (ret < 0) {
 121                         goto end;
 122                 }
 123                 evaluation_size += ret;
 124                 break;
 125         default:
 126                 ERR("Attempted to create evaluation of unknown type (%i)",
 127                                 (int) evaluation_comm->type);
 128                 ret = -1;
 129                 goto end;
 130         }
 131         ret = evaluation_size;
 132 end:
 133         return ret;
 134 }
 135
 136 enum lttng_condition_type lttng_evaluation_get_type(
 137                 const struct lttng_evaluation *evaluation)
 138 {
 139         return evaluation ? evaluation->type : LTTNG_CONDITION_TYPE_UNKNOWN;
 140 }
 141
 142 void lttng_evaluation_destroy(struct lttng_evaluation *evaluation)
 143 {
 144         if (!evaluation) {
 145                 return;
 146         }
 147
 148         assert(evaluation->destroy);
 149         evaluation->destroy(evaluation);
 150 }