src/common/evaluation.cpp

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