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-matches-internal.h>
  14 #include <common/macros.h>
  15 #include <common/error.h>
  16 #include <stdbool.h>
  17
  18 LTTNG_HIDDEN
  19 void lttng_evaluation_init(struct lttng_evaluation *evaluation,
  20                 enum lttng_condition_type type)
  21 {
  22         evaluation->type = type;
  23 }
  24
  25 LTTNG_HIDDEN
  26 int lttng_evaluation_serialize(const struct lttng_evaluation *evaluation,
  27                 struct lttng_payload *payload)
  28 {
  29         int ret;
  30         struct lttng_evaluation_comm evaluation_comm = {
  31                 .type = (int8_t) evaluation->type
  32         };
  33
  34         ret = lttng_dynamic_buffer_append(&payload->buffer, &evaluation_comm,
  35                         sizeof(evaluation_comm));
  36         if (ret) {
  37                 goto end;
  38         }
  39
  40         if (evaluation->serialize) {
  41                 ret = evaluation->serialize(evaluation, payload);
  42                 if (ret) {
  43                         goto end;
  44                 }
  45         }
  46 end:
  47         return ret;
  48 }
  49
  50 LTTNG_HIDDEN
  51 ssize_t lttng_evaluation_create_from_payload(
  52                 const struct lttng_condition *condition,
  53                 struct lttng_payload_view *src_view,
  54                 struct lttng_evaluation **evaluation)
  55 {
  56         ssize_t ret, evaluation_size = 0;
  57         const struct lttng_evaluation_comm *evaluation_comm;
  58         struct lttng_payload_view evaluation_comm_view =
  59                         lttng_payload_view_from_view(
  60                                         src_view, 0, sizeof(*evaluation_comm));
  61         struct lttng_payload_view evaluation_view =
  62                         lttng_payload_view_from_view(src_view,
  63                                         sizeof(*evaluation_comm), -1);
  64
  65         if (!src_view || !evaluation) {
  66                 ret = -1;
  67                 goto end;
  68         }
  69
  70         if (!lttng_payload_view_is_valid(&evaluation_comm_view)) {
  71                 ret = -1;
  72                 goto end;
  73         }
  74
  75         evaluation_comm = (typeof(evaluation_comm)) evaluation_comm_view.buffer.data;
  76         evaluation_size += sizeof(*evaluation_comm);
  77
  78         switch ((enum lttng_condition_type) evaluation_comm->type) {
  79         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
  80                 ret = lttng_evaluation_buffer_usage_low_create_from_payload(
  81                                 &evaluation_view, evaluation);
  82                 if (ret < 0) {
  83                         goto end;
  84                 }
  85                 evaluation_size += ret;
  86                 break;
  87         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
  88                 ret = lttng_evaluation_buffer_usage_high_create_from_payload(
  89                                 &evaluation_view, evaluation);
  90                 if (ret < 0) {
  91                         goto end;
  92                 }
  93                 evaluation_size += ret;
  94                 break;
  95         case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
  96                 ret = lttng_evaluation_session_consumed_size_create_from_payload(
  97                                 &evaluation_view, evaluation);
  98                 if (ret < 0) {
  99                         goto end;
 100                 }
 101                 evaluation_size += ret;
 102                 break;
 103         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
 104                 ret = lttng_evaluation_session_rotation_ongoing_create_from_payload(
 105                                 &evaluation_view, evaluation);
 106                 if (ret < 0) {
 107                         goto end;
 108                 }
 109                 evaluation_size += ret;
 110                 break;
 111         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
 112                 ret = lttng_evaluation_session_rotation_completed_create_from_payload(
 113                                 &evaluation_view, evaluation);
 114                 if (ret < 0) {
 115                         goto end;
 116                 }
 117                 evaluation_size += ret;
 118                 break;
 119         case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES:
 120                 LTTNG_ASSERT(condition);
 121                 LTTNG_ASSERT(condition->type ==
 122                                 LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES);
 123                 ret = lttng_evaluation_event_rule_matches_create_from_payload(
 124                                 container_of(condition,
 125                                                 const struct lttng_condition_event_rule_matches,
 126                                                 parent),
 127                                 &evaluation_view, evaluation);
 128                 if (ret < 0) {
 129                         goto end;
 130                 }
 131                 evaluation_size += ret;
 132                 break;
 133         default:
 134                 ERR("Attempted to create evaluation of unknown type (%i)",
 135                                 (int) evaluation_comm->type);
 136                 ret = -1;
 137                 goto end;
 138         }
 139
 140         ret = evaluation_size;
 141 end:
 142         return ret;
 143 }
 144
 145 enum lttng_condition_type lttng_evaluation_get_type(
 146                 const struct lttng_evaluation *evaluation)
 147 {
 148         return evaluation ? evaluation->type : LTTNG_CONDITION_TYPE_UNKNOWN;
 149 }
 150
 151 void lttng_evaluation_destroy(struct lttng_evaluation *evaluation)
 152 {
 153         if (!evaluation) {
 154                 return;
 155         }
 156
 157         LTTNG_ASSERT(evaluation->destroy);
 158         evaluation->destroy(evaluation);
 159 }