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/evaluation-internal.h>
   9 #include <lttng/condition/buffer-usage-internal.h>
  10 #include <lttng/condition/session-consumed-size-internal.h>
  11 #include <lttng/condition/session-rotation-internal.h>
  12 #include <lttng/condition/event-rule-internal.h>
  13 #include <common/macros.h>
  14 #include <common/error.h>
  15 #include <stdbool.h>
  16 #include <assert.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                 struct lttng_payload_view *src_view,
  53                 struct lttng_evaluation **evaluation)
  54 {
  55         ssize_t ret, evaluation_size = 0;
  56         const struct lttng_evaluation_comm *evaluation_comm;
  57         struct lttng_payload_view evaluation_comm_view =
  58                         lttng_payload_view_from_view(
  59                                         src_view, 0, sizeof(*evaluation_comm));
  60         struct lttng_payload_view evaluation_view =
  61                         lttng_payload_view_from_view(src_view,
  62                                         sizeof(*evaluation_comm), -1);
  63
  64         if (!src_view || !evaluation) {
  65                 ret = -1;
  66                 goto end;
  67         }
  68
  69         if (!lttng_payload_view_is_valid(&evaluation_comm_view)) {
  70                 ret = -1;
  71                 goto end;
  72         }
  73
  74         evaluation_comm = (typeof(evaluation_comm)) evaluation_comm_view.buffer.data;
  75         evaluation_size += sizeof(*evaluation_comm);
  76
  77         switch ((enum lttng_condition_type) evaluation_comm->type) {
  78         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
  79                 ret = lttng_evaluation_buffer_usage_low_create_from_payload(
  80                                 &evaluation_view, evaluation);
  81                 if (ret < 0) {
  82                         goto end;
  83                 }
  84                 evaluation_size += ret;
  85                 break;
  86         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
  87                 ret = lttng_evaluation_buffer_usage_high_create_from_payload(
  88                                 &evaluation_view, evaluation);
  89                 if (ret < 0) {
  90                         goto end;
  91                 }
  92                 evaluation_size += ret;
  93                 break;
  94         case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
  95                 ret = lttng_evaluation_session_consumed_size_create_from_payload(
  96                                 &evaluation_view, evaluation);
  97                 if (ret < 0) {
  98                         goto end;
  99                 }
 100                 evaluation_size += ret;
 101                 break;
 102         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
 103                 ret = lttng_evaluation_session_rotation_ongoing_create_from_payload(
 104                                 &evaluation_view, evaluation);
 105                 if (ret < 0) {
 106                         goto end;
 107                 }
 108                 evaluation_size += ret;
 109                 break;
 110         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
 111                 ret = lttng_evaluation_session_rotation_completed_create_from_payload(
 112                                 &evaluation_view, evaluation);
 113                 if (ret < 0) {
 114                         goto end;
 115                 }
 116                 evaluation_size += ret;
 117                 break;
 118         case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT:
 119                 ret = lttng_evaluation_event_rule_create_from_payload(&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
 132         ret = evaluation_size;
 133 end:
 134         return ret;
 135 }
 136
 137 enum lttng_condition_type lttng_evaluation_get_type(
 138                 const struct lttng_evaluation *evaluation)
 139 {
 140         return evaluation ? evaluation->type : LTTNG_CONDITION_TYPE_UNKNOWN;
 141 }
 142
 143 void lttng_evaluation_destroy(struct lttng_evaluation *evaluation)
 144 {
 145         if (!evaluation) {
 146                 return;
 147         }
 148
 149         assert(evaluation->destroy);
 150         evaluation->destroy(evaluation);
 151 }