src/common/condition.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/buffer-usage-internal.h>
  10 #include <lttng/condition/session-consumed-size-internal.h>
  11 #include <lttng/condition/session-rotation-internal.h>
  12 #include <common/macros.h>
  13 #include <common/error.h>
  14 #include <common/dynamic-buffer.h>
  15 #include <common/buffer-view.h>
  16 #include <stdbool.h>
  17 #include <assert.h>
  18
  19 enum lttng_condition_type lttng_condition_get_type(
  20                 const struct lttng_condition *condition)
  21 {
  22         return condition ? condition->type : LTTNG_CONDITION_TYPE_UNKNOWN;
  23 }
  24
  25 void lttng_condition_destroy(struct lttng_condition *condition)
  26 {
  27         if (!condition) {
  28                 return;
  29         }
  30
  31         assert(condition->destroy);
  32         condition->destroy(condition);
  33 }
  34
  35 LTTNG_HIDDEN
  36 bool lttng_condition_validate(const struct lttng_condition *condition)
  37 {
  38         bool valid;
  39
  40         if (!condition) {
  41                 valid = false;
  42                 goto end;
  43         }
  44
  45         if (!condition->validate) {
  46                 /* Sub-class guarantees that it can never be invalid. */
  47                 valid = true;
  48                 goto end;
  49         }
  50
  51         valid = condition->validate(condition);
  52 end:
  53         return valid;
  54 }
  55
  56 LTTNG_HIDDEN
  57 int lttng_condition_serialize(const struct lttng_condition *condition,
  58                 struct lttng_dynamic_buffer *buf)
  59 {
  60         int ret;
  61         struct lttng_condition_comm condition_comm = { 0 };
  62
  63         if (!condition) {
  64                 ret = -1;
  65                 goto end;
  66         }
  67
  68         condition_comm.condition_type = (int8_t) condition->type;
  69
  70         ret = lttng_dynamic_buffer_append(buf, &condition_comm,
  71                         sizeof(condition_comm));
  72         if (ret) {
  73                 goto end;
  74         }
  75
  76         ret = condition->serialize(condition, buf);
  77         if (ret) {
  78                 goto end;
  79         }
  80 end:
  81         return ret;
  82 }
  83
  84 LTTNG_HIDDEN
  85 bool lttng_condition_is_equal(const struct lttng_condition *a,
  86                 const struct lttng_condition *b)
  87 {
  88         bool is_equal = false;
  89
  90         if (!a || !b) {
  91                 goto end;
  92         }
  93
  94         if (a->type != b->type) {
  95                 goto end;
  96         }
  97
  98         if (a == b) {
  99                 is_equal = true;
 100                 goto end;
 101         }
 102
 103         is_equal = a->equal ? a->equal(a, b) : true;
 104 end:
 105         return is_equal;
 106 }
 107
 108 LTTNG_HIDDEN
 109 ssize_t lttng_condition_create_from_buffer(
 110                 const struct lttng_buffer_view *buffer,
 111                 struct lttng_condition **condition)
 112 {
 113         ssize_t ret, condition_size = 0;
 114         const struct lttng_condition_comm *condition_comm;
 115         condition_create_from_buffer_cb create_from_buffer = NULL;
 116
 117         if (!buffer || !condition) {
 118                 ret = -1;
 119                 goto end;
 120         }
 121
 122         DBG("Deserializing condition from buffer");
 123         condition_comm = (const struct lttng_condition_comm *) buffer->data;
 124         condition_size += sizeof(*condition_comm);
 125
 126         switch ((enum lttng_condition_type) condition_comm->condition_type) {
 127         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
 128                 create_from_buffer = lttng_condition_buffer_usage_low_create_from_buffer;
 129                 break;
 130         case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
 131                 create_from_buffer = lttng_condition_buffer_usage_high_create_from_buffer;
 132                 break;
 133         case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
 134                 create_from_buffer = lttng_condition_session_consumed_size_create_from_buffer;
 135                 break;
 136         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
 137                 create_from_buffer = lttng_condition_session_rotation_ongoing_create_from_buffer;
 138                 break;
 139         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
 140                 create_from_buffer = lttng_condition_session_rotation_completed_create_from_buffer;
 141                 break;
 142         default:
 143                 ERR("Attempted to create condition of unknown type (%i)",
 144                                 (int) condition_comm->condition_type);
 145                 ret = -1;
 146                 goto end;
 147         }
 148
 149         if (create_from_buffer) {
 150                 const struct lttng_buffer_view view =
 151                                 lttng_buffer_view_from_view(buffer,
 152                                         sizeof(*condition_comm), -1);
 153
 154                 ret = create_from_buffer(&view, condition);
 155                 if (ret < 0) {
 156                         goto end;
 157                 }
 158                 condition_size += ret;
 159
 160         } else {
 161                 abort();
 162         }
 163
 164         ret = condition_size;
 165 end:
 166         return ret;
 167 }
 168
 169 LTTNG_HIDDEN
 170 void lttng_condition_init(struct lttng_condition *condition,
 171                 enum lttng_condition_type type)
 172 {
 173         condition->type = type;
 174 }