1 | // Copyright (c) Microsoft. All rights reserved.
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2 | // Licensed under the MIT license. See LICENSE file in the project root for full license information.
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3 |
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4 | #include "internal/iothub_client_retry_control.h"
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5 |
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6 | #include <math.h>
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7 |
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8 | #include "azure_c_shared_utility/gballoc.h"
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9 | #include "azure_c_shared_utility/agenttime.h"
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10 | #include "azure_c_shared_utility/optimize_size.h"
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11 | #include "azure_c_shared_utility/xlogging.h"
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12 |
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13 | #define RESULT_OK 0
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14 | #define INDEFINITE_TIME ((time_t)-1)
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15 |
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16 | typedef struct RETRY_CONTROL_INSTANCE_TAG
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17 | {
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18 | IOTHUB_CLIENT_RETRY_POLICY policy;
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19 | unsigned int max_retry_time_in_secs;
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20 |
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21 | unsigned int initial_wait_time_in_secs;
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22 | unsigned int max_jitter_percent;
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23 |
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24 | unsigned int retry_count;
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25 | time_t first_retry_time;
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26 | time_t last_retry_time;
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27 | unsigned int current_wait_time_in_secs;
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28 | } RETRY_CONTROL_INSTANCE;
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29 |
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30 | typedef int (*RETRY_ACTION_EVALUATION_FUNCTION)(RETRY_CONTROL_INSTANCE* retry_state, RETRY_ACTION* retry_action);
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31 |
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32 |
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33 | // ========== Helper Functions ========== //
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34 |
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35 | // ---------- Set/Retrieve Options Helpers ----------//
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36 |
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37 | static void* retry_control_clone_option(const char* name, const void* value)
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38 | {
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39 | void* result;
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40 |
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41 | if ((name == NULL) || (value == NULL))
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42 | {
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43 | LogError("Failed to clone option (either name (%p) or value (%p) are NULL)", name, value);
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44 | result = NULL;
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45 | }
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46 | else if (strcmp(RETRY_CONTROL_OPTION_INITIAL_WAIT_TIME_IN_SECS, name) == 0 ||
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47 | strcmp(RETRY_CONTROL_OPTION_MAX_JITTER_PERCENT, name) == 0)
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48 | {
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49 | unsigned int* cloned_value;
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50 |
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51 | if ((cloned_value = (unsigned int*)malloc(sizeof(unsigned int))) == NULL)
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52 | {
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53 | LogError("Failed to clone option '%p' (malloc failed)", name);
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54 | result = NULL;
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55 | }
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56 | else
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57 | {
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58 | *cloned_value = *(unsigned int*)value;
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59 |
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60 | result = (void*)cloned_value;
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61 | }
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62 | }
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63 | else
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64 | {
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65 | LogError("Failed to clone option (option with name '%s' is not suppported)", name);
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66 | result = NULL;
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67 | }
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68 |
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69 | return result;
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70 | }
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71 |
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72 | static void retry_control_destroy_option(const char* name, const void* value)
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73 | {
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74 | if ((name == NULL) || (value == NULL))
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75 | {
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76 | LogError("Failed to destroy option (either name (%p) or value (%p) are NULL)", name, value);
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77 | }
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78 | else if (strcmp(RETRY_CONTROL_OPTION_INITIAL_WAIT_TIME_IN_SECS, name) == 0 ||
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79 | strcmp(RETRY_CONTROL_OPTION_MAX_JITTER_PERCENT, name) == 0)
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80 | {
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81 | free((void*)value);
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82 | }
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83 | else
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84 | {
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85 | LogError("Failed to destroy option (option with name '%s' is not suppported)", name);
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86 | }
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87 | }
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88 |
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89 | // ========== _should_retry() Auxiliary Functions ========== //
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90 |
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91 | static int evaluate_retry_action(RETRY_CONTROL_INSTANCE* retry_control, RETRY_ACTION* retry_action)
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92 | {
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93 | int result;
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94 |
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95 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_019: [If `retry_control->retry_count` is 0, `retry_action` shall be set to RETRY_ACTION_RETRY_NOW]
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96 | if (retry_control->retry_count == 0)
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97 | {
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98 | *retry_action = RETRY_ACTION_RETRY_NOW;
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99 | result = RESULT_OK;
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100 | }
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101 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_020: [If `retry_control->last_retry_time` is INDEFINITE_TIME and policy is not IOTHUB_CLIENT_RETRY_IMMEDIATE, the evaluation function shall return non-zero]
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102 | else if (retry_control->last_retry_time == INDEFINITE_TIME &&
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103 | retry_control->policy != IOTHUB_CLIENT_RETRY_IMMEDIATE)
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104 | {
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105 | LogError("Failed to evaluate retry action (last_retry_time is INDEFINITE_TIME)");
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106 | result = MU_FAILURE;
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107 | }
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108 | else
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109 | {
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110 | time_t current_time;
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111 |
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112 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_021: [`current_time` shall be set using get_time()]
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113 | if ((current_time = get_time(NULL)) == INDEFINITE_TIME)
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114 | {
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115 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_022: [If get_time() fails, the evaluation function shall return non-zero]
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116 | LogError("Failed to evaluate retry action (get_time() failed)");
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117 | result = MU_FAILURE;
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118 | }
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119 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_023: [If `retry_control->max_retry_time_in_secs` is not 0 and (`current_time` - `retry_control->first_retry_time`) is greater than or equal to `retry_control->max_retry_time_in_secs`, `retry_action` shall be set to RETRY_ACTION_STOP_RETRYING]
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120 | else if (retry_control->max_retry_time_in_secs > 0 &&
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121 | get_difftime(current_time, retry_control->first_retry_time) >= retry_control->max_retry_time_in_secs)
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122 | {
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123 | *retry_action = RETRY_ACTION_STOP_RETRYING;
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124 |
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125 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_026: [If no errors occur, the evaluation function shall return 0]
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126 | result = RESULT_OK;
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127 | }
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128 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_028: [If `retry_control->policy` is IOTHUB_CLIENT_RETRY_IMMEDIATE, retry_action shall be set to RETRY_ACTION_RETRY_NOW]
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129 | else if (retry_control->policy == IOTHUB_CLIENT_RETRY_IMMEDIATE)
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130 | {
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131 | *retry_action = RETRY_ACTION_RETRY_NOW;
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132 |
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133 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_026: [If no errors occur, the evaluation function shall return 0]
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134 | result = RESULT_OK;
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135 | }
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136 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_024: [Otherwise, if (`current_time` - `retry_control->last_retry_time`) is less than `retry_control->current_wait_time_in_secs`, `retry_action` shall be set to RETRY_ACTION_RETRY_LATER]
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137 | else if (get_difftime(current_time, retry_control->last_retry_time) < retry_control->current_wait_time_in_secs)
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138 | {
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139 | *retry_action = RETRY_ACTION_RETRY_LATER;
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140 |
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141 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_026: [If no errors occur, the evaluation function shall return 0]
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142 | result = RESULT_OK;
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143 | }
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144 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_025: [Otherwise, if (`current_time` - `retry_control->last_retry_time`) is greater or equal to `retry_control->current_wait_time_in_secs`, `retry_action` shall be set to RETRY_ACTION_RETRY_NOW]
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145 | else
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146 | {
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147 | *retry_action = RETRY_ACTION_RETRY_NOW;
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148 |
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149 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_026: [If no errors occur, the evaluation function shall return 0]
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150 | result = RESULT_OK;
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151 | }
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152 | }
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153 |
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154 | return result;
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155 | }
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156 |
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157 | static unsigned int calculate_next_wait_time(RETRY_CONTROL_INSTANCE* retry_control)
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158 | {
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159 | unsigned int result;
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160 |
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161 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_029: [If `retry_control->policy` is IOTHUB_CLIENT_RETRY_INTERVAL, `calculate_next_wait_time` shall return `retry_control->initial_wait_time_in_secs`]
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162 | if (retry_control->policy == IOTHUB_CLIENT_RETRY_INTERVAL)
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163 | {
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164 | result = retry_control->initial_wait_time_in_secs;
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165 | }
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166 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_030: [If `retry_control->policy` is IOTHUB_CLIENT_RETRY_LINEAR_BACKOFF, `calculate_next_wait_time` shall return (`retry_control->initial_wait_time_in_secs` * (`retry_control->retry_count`))]
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167 | else if (retry_control->policy == IOTHUB_CLIENT_RETRY_LINEAR_BACKOFF)
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168 | {
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169 | result = retry_control->initial_wait_time_in_secs * (retry_control->retry_count);
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170 | }
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171 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_031: [If `retry_control->policy` is IOTHUB_CLIENT_RETRY_EXPONENTIAL_BACKOFF, `calculate_next_wait_time` shall return (pow(2, `retry_control->retry_count` - 1) * `retry_control->initial_wait_time_in_secs`)]
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172 | else if (retry_control->policy == IOTHUB_CLIENT_RETRY_EXPONENTIAL_BACKOFF)
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173 | {
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174 | result = (unsigned int)(pow(2, retry_control->retry_count - 1) * retry_control->initial_wait_time_in_secs);
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175 | }
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176 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_032: [If `retry_control->policy` is IOTHUB_CLIENT_RETRY_EXPONENTIAL_BACKOFF_WITH_JITTER, `calculate_next_wait_time` shall return ((pow(2, `retry_control->retry_count` - 1) * `retry_control->initial_wait_time_in_secs`) * (1 + (`retry_control->max_jitter_percent` / 100) * (rand() / RAND_MAX)))]
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177 | else if (retry_control->policy == IOTHUB_CLIENT_RETRY_EXPONENTIAL_BACKOFF_WITH_JITTER)
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178 | {
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179 | double jitter_percent = (retry_control->max_jitter_percent / 100.0) * (rand() / ((double)RAND_MAX));
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180 |
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181 | result = (unsigned int)(pow(2, retry_control->retry_count - 1) * retry_control->initial_wait_time_in_secs * (1 + jitter_percent));
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182 | }
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183 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_033: [If `retry_control->policy` is IOTHUB_CLIENT_RETRY_RANDOM, `calculate_next_wait_time` shall return (`retry_control->initial_wait_time_in_secs` * (rand() / RAND_MAX))]
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184 | else if (retry_control->policy == IOTHUB_CLIENT_RETRY_RANDOM)
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185 | {
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186 | double random_percent = ((double)rand() / (double)RAND_MAX);
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187 | result = (unsigned int)(retry_control->initial_wait_time_in_secs * random_percent);
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188 | }
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189 | else
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190 | {
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191 | LogError("Failed to calculate the next wait time (policy %d is not expected)", retry_control->policy);
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192 |
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193 | result = 0;
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194 | }
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195 |
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196 | return result;
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197 | }
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198 |
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199 |
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200 | // ========== Public API ========== //
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201 |
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202 | int is_timeout_reached(time_t start_time, unsigned int timeout_in_secs, bool* is_timed_out)
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203 | {
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204 | int result;
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205 |
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206 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_057: [If `start_time` is INDEFINITE_TIME, `is_timeout_reached` shall fail and return non-zero]
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207 | if (start_time == INDEFINITE_TIME)
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208 | {
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209 | LogError("Failed to verify timeout (start_time is INDEFINITE)");
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210 | result = MU_FAILURE;
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211 | }
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212 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_058: [If `is_timed_out` is NULL, `is_timeout_reached` shall fail and return non-zero]
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213 | else if (is_timed_out == NULL)
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214 | {
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215 | LogError("Failed to verify timeout (is_timed_out is NULL)");
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216 | result = MU_FAILURE;
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217 | }
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218 | else
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219 | {
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220 | time_t current_time;
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221 |
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222 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_059: [`is_timeout_reached` shall obtain the `current_time` using get_time()]
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223 | if ((current_time = get_time(NULL)) == INDEFINITE_TIME)
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224 | {
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225 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_060: [If get_time() fails, `is_timeout_reached` shall fail and return non-zero]
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226 | LogError("Failed to verify timeout (get_time failed)");
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227 | result = MU_FAILURE;
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228 | }
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229 | else
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230 | {
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231 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_061: [If (`current_time` - `start_time`) is greater or equal to `timeout_in_secs`, `is_timed_out` shall be set to true]
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232 | if (get_difftime(current_time, start_time) >= timeout_in_secs)
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233 | {
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234 | *is_timed_out = true;
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235 | }
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236 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_062: [If (`current_time` - `start_time`) is less than `timeout_in_secs`, `is_timed_out` shall be set to false]
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237 | else
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238 | {
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239 | *is_timed_out = false;
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240 | }
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241 |
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242 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_063: [If no errors occur, `is_timeout_reached` shall return 0]
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243 | result = RESULT_OK;
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244 | }
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245 | }
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246 |
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247 | return result;
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248 | }
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249 |
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250 | void retry_control_reset(RETRY_CONTROL_HANDLE retry_control_handle)
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251 | {
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252 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_034: [If `retry_control_handle` is NULL, `retry_control_reset` shall return]
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253 | if (retry_control_handle == NULL)
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254 | {
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255 | LogError("Failed to reset the retry control (retry_state_handle is NULL)");
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256 | }
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257 | else
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258 | {
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259 | RETRY_CONTROL_INSTANCE* retry_control = (RETRY_CONTROL_INSTANCE*)retry_control_handle;
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260 |
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261 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_035: [`retry_control` shall have fields `retry_count` and `current_wait_time_in_secs` set to 0 (zero), `first_retry_time` and `last_retry_time` set to INDEFINITE_TIME]
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262 | retry_control->retry_count = 0;
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263 | retry_control->current_wait_time_in_secs = 0;
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264 | retry_control->first_retry_time = INDEFINITE_TIME;
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265 | retry_control->last_retry_time = INDEFINITE_TIME;
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266 | }
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267 | }
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268 |
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269 | RETRY_CONTROL_HANDLE retry_control_create(IOTHUB_CLIENT_RETRY_POLICY policy, unsigned int max_retry_time_in_secs)
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270 | {
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271 | RETRY_CONTROL_INSTANCE* retry_control;
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272 |
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273 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_002: [`retry_control_create` shall allocate memory for the retry control instance structure (a.k.a. `retry_control`)]
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274 | if ((retry_control = (RETRY_CONTROL_INSTANCE*)malloc(sizeof(RETRY_CONTROL_INSTANCE))) == NULL)
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275 | {
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276 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_003: [If malloc fails, `retry_control_create` shall fail and return NULL]
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277 | LogError("Failed creating the retry control (malloc failed)");
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278 | }
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279 | else
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280 | {
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281 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_004: [The parameters passed to `retry_control_create` shall be saved into `retry_control`]
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282 | memset(retry_control, 0, sizeof(RETRY_CONTROL_INSTANCE));
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283 | retry_control->policy = policy;
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284 | retry_control->max_retry_time_in_secs = max_retry_time_in_secs;
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285 |
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286 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_005: [If `policy` is IOTHUB_CLIENT_RETRY_EXPONENTIAL_BACKOFF or IOTHUB_CLIENT_RETRY_EXPONENTIAL_BACKOFF_WITH_JITTER, `retry_control->initial_wait_time_in_secs` shall be set to 1]
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287 | if (retry_control->policy == IOTHUB_CLIENT_RETRY_EXPONENTIAL_BACKOFF ||
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288 | retry_control->policy == IOTHUB_CLIENT_RETRY_EXPONENTIAL_BACKOFF_WITH_JITTER)
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289 | {
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290 | retry_control->initial_wait_time_in_secs = 1;
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291 | }
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292 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_006: [Otherwise `retry_control->initial_wait_time_in_secs` shall be set to 5]
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293 | else
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294 | {
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295 | retry_control->initial_wait_time_in_secs = 5;
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296 | }
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297 |
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298 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_007: [`retry_control->max_jitter_percent` shall be set to 5]
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299 | retry_control->max_jitter_percent = 5;
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300 |
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301 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_008: [The remaining fields in `retry_control` shall be initialized according to retry_control_reset()]
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302 | retry_control_reset(retry_control);
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303 | }
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304 |
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305 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_009: [If no errors occur, `retry_control_create` shall return a handle to `retry_control`]
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306 | return (RETRY_CONTROL_HANDLE)retry_control;
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307 | }
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308 |
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309 | void retry_control_destroy(RETRY_CONTROL_HANDLE retry_control_handle)
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310 | {
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311 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_055: [If `retry_control_handle` is NULL, `retry_control_destroy` shall return]
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312 | if (retry_control_handle == NULL)
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313 | {
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314 | LogError("Failed to destroy the retry control (retry_control_handle is NULL)");
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315 | }
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316 | else
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317 | {
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318 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_056: [`retry_control_destroy` shall destroy `retry_control_handle` using free()]
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319 | free(retry_control_handle);
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320 | }
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321 | }
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322 |
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323 | int retry_control_should_retry(RETRY_CONTROL_HANDLE retry_control_handle, RETRY_ACTION* retry_action)
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324 | {
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325 | int result;
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326 |
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327 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_010: [If `retry_control_handle` or `retry_action` are NULL, `retry_control_should_retry` shall fail and return non-zero]
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328 | if ((retry_control_handle == NULL) || (retry_action == NULL))
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329 | {
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330 | LogError("Failed to evaluate if retry should be attempted (either retry_control_handle (%p) or retry_action (%p) are NULL)", retry_control_handle, retry_action);
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331 | result = MU_FAILURE;
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332 | }
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333 | else
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334 | {
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335 | RETRY_CONTROL_INSTANCE* retry_control = (RETRY_CONTROL_INSTANCE*)retry_control_handle;
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336 |
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337 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_027: [If `retry_control->policy` is IOTHUB_CLIENT_RETRY_NONE, retry_action shall be set to RETRY_ACTION_STOP_RETRYING and return immediatelly with result 0]
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338 | if (retry_control->policy == IOTHUB_CLIENT_RETRY_NONE)
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339 | {
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340 | *retry_action = RETRY_ACTION_STOP_RETRYING;
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341 | result = RESULT_OK;
|
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342 | }
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343 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_011: [If `retry_control->first_retry_time` is INDEFINITE_TIME, it shall be set using get_time()]
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344 | else if (retry_control->first_retry_time == INDEFINITE_TIME && (retry_control->first_retry_time = get_time(NULL)) == INDEFINITE_TIME)
|
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345 | {
|
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346 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_012: [If get_time() fails, `retry_control_should_retry` shall fail and return non-zero]
|
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347 | LogError("Failed to evaluate if retry should be attempted (get_time() failed)");
|
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348 | result = MU_FAILURE;
|
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349 | }
|
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350 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_013: [evaluate_retry_action() shall be invoked]
|
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351 | else if (evaluate_retry_action(retry_control, retry_action) != RESULT_OK)
|
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352 | {
|
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353 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_014: [If evaluate_retry_action() fails, `retry_control_should_retry` shall fail and return non-zero]
|
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354 | LogError("Failed to evaluate if retry should be attempted (evaluate_retry_action() failed)");
|
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355 | result = MU_FAILURE;
|
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356 | }
|
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357 | else
|
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358 | {
|
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359 | if (*retry_action == RETRY_ACTION_RETRY_NOW)
|
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360 | {
|
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361 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_015: [If `retry_action` is set to RETRY_ACTION_RETRY_NOW, `retry_control->retry_count` shall be incremented by 1]
|
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362 | retry_control->retry_count++;
|
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363 |
|
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364 | if (retry_control->policy != IOTHUB_CLIENT_RETRY_IMMEDIATE)
|
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365 | {
|
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366 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_016: [If `retry_action` is set to RETRY_ACTION_RETRY_NOW and policy is not IOTHUB_CLIENT_RETRY_IMMEDIATE, `retry_control->last_retry_time` shall be set using get_time()]
|
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367 | retry_control->last_retry_time = get_time(NULL);
|
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368 |
|
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369 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_017: [If `retry_action` is set to RETRY_ACTION_RETRY_NOW and policy is not IOTHUB_CLIENT_RETRY_IMMEDIATE, `retry_control->current_wait_time_in_secs` shall be set using calculate_next_wait_time()]
|
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370 | retry_control->current_wait_time_in_secs = calculate_next_wait_time(retry_control);
|
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371 | }
|
---|
372 | }
|
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373 |
|
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374 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_018: [If no errors occur, `retry_control_should_retry` shall return 0]
|
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375 | result = RESULT_OK;
|
---|
376 | }
|
---|
377 | }
|
---|
378 |
|
---|
379 | return result;
|
---|
380 | }
|
---|
381 |
|
---|
382 | int retry_control_set_option(RETRY_CONTROL_HANDLE retry_control_handle, const char* name, const void* value)
|
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383 | {
|
---|
384 | int result;
|
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385 |
|
---|
386 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_036: [If `retry_control_handle`, `name` or `value` are NULL, `retry_control_set_option` shall fail and return non-zero]
|
---|
387 | if (retry_control_handle == NULL || name == NULL || value == NULL)
|
---|
388 | {
|
---|
389 | LogError("Failed to set option (either retry_state_handle (%p), name (%p) or value (%p) are NULL)", retry_control_handle, name, value);
|
---|
390 | result = MU_FAILURE;
|
---|
391 | }
|
---|
392 | else
|
---|
393 | {
|
---|
394 | RETRY_CONTROL_INSTANCE* retry_control = (RETRY_CONTROL_INSTANCE*)retry_control_handle;
|
---|
395 |
|
---|
396 | if (strcmp(RETRY_CONTROL_OPTION_INITIAL_WAIT_TIME_IN_SECS, name) == 0)
|
---|
397 | {
|
---|
398 | unsigned int cast_value = *((unsigned int*)value);
|
---|
399 |
|
---|
400 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_037: [If `name` is "initial_wait_time_in_secs" and `value` is less than 1, `retry_control_set_option` shall fail and return non-zero]
|
---|
401 | if (cast_value < 1)
|
---|
402 | {
|
---|
403 | LogError("Failed to set option '%s' (value must be equal or greater to 1)", name);
|
---|
404 | result = MU_FAILURE;
|
---|
405 | }
|
---|
406 | else
|
---|
407 | {
|
---|
408 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_038: [If `name` is "initial_wait_time_in_secs", `value` shall be saved on `retry_control->initial_wait_time_in_secs`]
|
---|
409 | retry_control->initial_wait_time_in_secs = cast_value;
|
---|
410 |
|
---|
411 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_044: [If no errors occur, retry_control_set_option shall return 0]
|
---|
412 | result = RESULT_OK;
|
---|
413 | }
|
---|
414 | }
|
---|
415 | else if (strcmp(RETRY_CONTROL_OPTION_MAX_JITTER_PERCENT, name) == 0)
|
---|
416 | {
|
---|
417 | unsigned int cast_value = *((unsigned int*)value);
|
---|
418 |
|
---|
419 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_039: [If `name` is "max_jitter_percent" and `value` is less than 0 or greater than 100, `retry_control_set_option` shall fail and return non-zero]
|
---|
420 | if (cast_value > 100) // it's unsigned int, it doesn't need to be checked for less than zero.
|
---|
421 | {
|
---|
422 | LogError("Failed to set option '%s' (value must be in the range 0 to 100)", name);
|
---|
423 | result = MU_FAILURE;
|
---|
424 | }
|
---|
425 | else
|
---|
426 | {
|
---|
427 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_040: [If `name` is "max_jitter_percent", value shall be saved on `retry_control->max_jitter_percent`]
|
---|
428 | retry_control->max_jitter_percent = cast_value;
|
---|
429 |
|
---|
430 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_044: [If no errors occur, retry_control_set_option shall return 0]
|
---|
431 | result = RESULT_OK;
|
---|
432 | }
|
---|
433 | }
|
---|
434 | else if (strcmp(RETRY_CONTROL_OPTION_SAVED_OPTIONS, name) == 0)
|
---|
435 | {
|
---|
436 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_041: [If `name` is "retry_control_options", value shall be fed to `retry_control` using OptionHandler_FeedOptions]
|
---|
437 | if (OptionHandler_FeedOptions((OPTIONHANDLER_HANDLE)value, retry_control_handle) != OPTIONHANDLER_OK)
|
---|
438 | {
|
---|
439 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_042: [If OptionHandler_FeedOptions fails, `retry_control_set_option` shall fail and return non-zero]
|
---|
440 | LogError("messenger_set_option failed (OptionHandler_FeedOptions failed)");
|
---|
441 | result = MU_FAILURE;
|
---|
442 | }
|
---|
443 | else
|
---|
444 | {
|
---|
445 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_044: [If no errors occur, `retry_control_set_option` shall return 0]
|
---|
446 | result = RESULT_OK;
|
---|
447 | }
|
---|
448 | }
|
---|
449 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_043: [If `name` is not a supported option, `retry_control_set_option` shall fail and return non-zero]
|
---|
450 | else
|
---|
451 | {
|
---|
452 | LogError("messenger_set_option failed (option with name '%s' is not suppported)", name);
|
---|
453 | result = MU_FAILURE;
|
---|
454 | }
|
---|
455 | }
|
---|
456 |
|
---|
457 | return result;
|
---|
458 | }
|
---|
459 |
|
---|
460 | OPTIONHANDLER_HANDLE retry_control_retrieve_options(RETRY_CONTROL_HANDLE retry_control_handle)
|
---|
461 | {
|
---|
462 | OPTIONHANDLER_HANDLE result;
|
---|
463 |
|
---|
464 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_045: [If `retry_control_handle`, `retry_control_retrieve_options` shall fail and return NULL]
|
---|
465 | if (retry_control_handle == NULL)
|
---|
466 | {
|
---|
467 | LogError("Failed to retrieve options (retry_state_handle is NULL)");
|
---|
468 | result = NULL;
|
---|
469 | }
|
---|
470 | else
|
---|
471 | {
|
---|
472 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_046: [An instance of OPTIONHANDLER_HANDLE (a.k.a. `options`) shall be created using OptionHandler_Create]
|
---|
473 | OPTIONHANDLER_HANDLE options = OptionHandler_Create(retry_control_clone_option, retry_control_destroy_option, (pfSetOption)retry_control_set_option);
|
---|
474 |
|
---|
475 | if (options == NULL)
|
---|
476 | {
|
---|
477 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_047: [If OptionHandler_Create fails, `retry_control_retrieve_options` shall fail and return NULL]
|
---|
478 | LogError("Failed to retrieve options (OptionHandler_Create failed)");
|
---|
479 | result = NULL;
|
---|
480 | }
|
---|
481 | else
|
---|
482 | {
|
---|
483 | RETRY_CONTROL_INSTANCE* retry_control = (RETRY_CONTROL_INSTANCE*)retry_control_handle;
|
---|
484 |
|
---|
485 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_050: [`retry_control->initial_wait_time_in_secs` shall be added to `options` using OptionHandler_Add]
|
---|
486 | if (OptionHandler_AddOption(options, RETRY_CONTROL_OPTION_INITIAL_WAIT_TIME_IN_SECS, (void*)&retry_control->initial_wait_time_in_secs) != OPTIONHANDLER_OK)
|
---|
487 | {
|
---|
488 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_052: [If any call to OptionHandler_Add fails, `retry_control_retrieve_options` shall fail and return NULL]
|
---|
489 | LogError("Failed to retrieve options (OptionHandler_Create failed for option '%s')", RETRY_CONTROL_OPTION_INITIAL_WAIT_TIME_IN_SECS);
|
---|
490 | result = NULL;
|
---|
491 | }
|
---|
492 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_051: [`retry_control->max_jitter_percent` shall be added to `options` using OptionHandler_Add]
|
---|
493 | else if (OptionHandler_AddOption(options, RETRY_CONTROL_OPTION_MAX_JITTER_PERCENT, (void*)&retry_control->max_jitter_percent) != OPTIONHANDLER_OK)
|
---|
494 | {
|
---|
495 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_052: [If any call to OptionHandler_Add fails, `retry_control_retrieve_options` shall fail and return NULL]
|
---|
496 | LogError("Failed to retrieve options (OptionHandler_Create failed for option '%s')", RETRY_CONTROL_OPTION_INITIAL_WAIT_TIME_IN_SECS);
|
---|
497 | result = NULL;
|
---|
498 | }
|
---|
499 | else
|
---|
500 | {
|
---|
501 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_054: [If no errors occur, `retry_control_retrieve_options` shall return the OPTIONHANDLER_HANDLE instance]
|
---|
502 | result = options;
|
---|
503 | }
|
---|
504 |
|
---|
505 | if (result == NULL)
|
---|
506 | {
|
---|
507 | // Codes_SRS_IOTHUB_CLIENT_RETRY_CONTROL_09_053: [If any failures occur, `retry_control_retrieve_options` shall release any memory it has allocated]
|
---|
508 | OptionHandler_Destroy(options);
|
---|
509 | }
|
---|
510 | }
|
---|
511 | }
|
---|
512 |
|
---|
513 | return result;
|
---|
514 | }
|
---|