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/on-event-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_payload *payload)
  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(&payload->buffer, &evaluation_comm,
  36                         sizeof(evaluation_comm));
  37         if (ret) {
  38                 goto end;
  39         }
  40
  41         if (evaluation->serialize) {
  42                 ret = evaluation->serialize(evaluation, payload);
  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_payload(
  53                 const struct lttng_condition *condition,
  54                 struct lttng_payload_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         struct lttng_payload_view evaluation_comm_view =
  60                         lttng_payload_view_from_view(
  61                                         src_view, 0, sizeof(*evaluation_comm));
  62         struct lttng_payload_view evaluation_view =
  63                         lttng_payload_view_from_view(src_view,
  64                                         sizeof(*evaluation_comm), -1);
  65
  66         if (!src_view || !evaluation) {
  67                 ret = -1;
  68                 goto end;
  69         }
  70
  71         if (!lttng_payload_view_is_valid(&evaluation_comm_view)) {
  72                 ret = -1;
  73                 goto end;
  74         }
  75
  76         evaluation_comm = (typeof(evaluation_comm)) evaluation_comm_view.buffer.data;
  77         evaluation_size += sizeof(*evaluation_comm);
  78
  79         switch ((enum lttng_condition_type) evaluation_comm->type) {
  80         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
  81                 ret = lttng_evaluation_buffer_usage_low_create_from_payload(
  82                                 &evaluation_view, evaluation);
  83                 if (ret < 0) {
  84                         goto end;
  85                 }
  86                 evaluation_size += ret;
  87                 break;
  88         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
  89                 ret = lttng_evaluation_buffer_usage_high_create_from_payload(
  90                                 &evaluation_view, evaluation);
  91                 if (ret < 0) {
  92                         goto end;
  93                 }
  94                 evaluation_size += ret;
  95                 break;
  96         case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
  97                 ret = lttng_evaluation_session_consumed_size_create_from_payload(
  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_ONGOING:
 105                 ret = lttng_evaluation_session_rotation_ongoing_create_from_payload(
 106                                 &evaluation_view, evaluation);
 107                 if (ret < 0) {
 108                         goto end;
 109                 }
 110                 evaluation_size += ret;
 111                 break;
 112         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
 113                 ret = lttng_evaluation_session_rotation_completed_create_from_payload(
 114                                 &evaluation_view, evaluation);
 115                 if (ret < 0) {
 116                         goto end;
 117                 }
 118                 evaluation_size += ret;
 119                 break;
 120         case LTTNG_CONDITION_TYPE_ON_EVENT:
 121                 assert(condition);
 122                 assert(condition->type == LTTNG_CONDITION_TYPE_ON_EVENT);
 123                 ret = lttng_evaluation_on_event_create_from_payload(
 124                                 container_of(condition,
 125                                                 const struct lttng_condition_on_event,
 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         assert(evaluation->destroy);
 158         evaluation->destroy(evaluation);
 159 }