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 <stdlib.h>
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5 | #include <signal.h>
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6 | #include <stddef.h>
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7 | #include "azure_c_shared_utility/gballoc.h"
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8 | #include "azure_c_shared_utility/crt_abstractions.h"
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9 | #include "internal/iothubtransport.h"
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10 | #include "iothub_client_core.h"
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11 | #include "internal/iothub_client_private.h"
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12 | #include "azure_c_shared_utility/threadapi.h"
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13 | #include "azure_c_shared_utility/lock.h"
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14 | #include "azure_c_shared_utility/xlogging.h"
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15 | #include "azure_c_shared_utility/vector.h"
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16 |
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17 | #include "internal/iothubtransport.h"
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18 | #include "internal/iothub_client_private.h"
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19 | #include "iothub_transport_ll.h"
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20 | #include "iothub_client_core.h"
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21 |
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22 | typedef struct TRANSPORT_HANDLE_DATA_TAG
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23 | {
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24 | TRANSPORT_LL_HANDLE transportLLHandle;
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25 | THREAD_HANDLE workerThreadHandle;
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26 | LOCK_HANDLE lockHandle;
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27 | sig_atomic_t stopThread;
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28 | TRANSPORT_PROVIDER_FIELDS;
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29 | VECTOR_HANDLE clients;
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30 | LOCK_HANDLE clientsLockHandle;
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31 | IOTHUB_CLIENT_MULTIPLEXED_DO_WORK clientDoWork;
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32 | } TRANSPORT_HANDLE_DATA;
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33 |
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34 | /* Used for Unit test */
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35 | const size_t IoTHubTransport_ThreadTerminationOffset = offsetof(TRANSPORT_HANDLE_DATA, stopThread);
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36 |
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37 | TRANSPORT_HANDLE IoTHubTransport_Create(IOTHUB_CLIENT_TRANSPORT_PROVIDER protocol, const char* iotHubName, const char* iotHubSuffix)
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38 | {
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39 | TRANSPORT_HANDLE_DATA *result;
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40 | TRANSPORT_CALLBACKS_INFO transport_cb;
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41 |
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42 | if (protocol == NULL || iotHubName == NULL || iotHubSuffix == NULL)
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43 | {
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44 | /*Codes_SRS_IOTHUBTRANSPORT_17_002: [ If protocol is NULL, this function shall return NULL. ]*/
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45 | /*Codes_SRS_IOTHUBTRANSPORT_17_003: [ If iotHubName is NULL, this function shall return NULL. ]*/
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46 | /*Codes_SRS_IOTHUBTRANSPORT_17_004: [ If iotHubSuffix is NULL, this function shall return NULL. ]*/
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47 | LogError("Invalid NULL argument, protocol [%p], name [%p], suffix [%p].", protocol, iotHubName, iotHubSuffix);
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48 | result = NULL;
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49 | }
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50 | else if (IoTHubClientCore_LL_GetTransportCallbacks(&transport_cb) != 0)
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51 | {
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52 | LogError("Failure getting transport callbacks");
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53 | result = NULL;
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54 | }
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55 | else
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56 | {
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57 | /*Codes_SRS_IOTHUBTRANSPORT_17_032: [ IoTHubTransport_Create shall allocate memory for the transport data. ]*/
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58 | result = (TRANSPORT_HANDLE_DATA*)malloc(sizeof(TRANSPORT_HANDLE_DATA));
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59 | if (result == NULL)
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60 | {
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61 | /*Codes_SRS_IOTHUBTRANSPORT_17_040: [ If memory allocation fails, IoTHubTransport_Create shall return NULL. ]*/
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62 | LogError("Transport handle was not allocated.");
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63 | }
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64 | else
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65 | {
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66 | TRANSPORT_PROVIDER * transportProtocol = (TRANSPORT_PROVIDER*)(protocol());
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67 | IOTHUB_CLIENT_CONFIG upperConfig;
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68 | upperConfig.deviceId = NULL;
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69 | upperConfig.deviceKey = NULL;
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70 | upperConfig.iotHubName = iotHubName;
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71 | upperConfig.iotHubSuffix = iotHubSuffix;
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72 | upperConfig.protocol = protocol;
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73 | upperConfig.protocolGatewayHostName = NULL;
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74 |
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75 | IOTHUBTRANSPORT_CONFIG transportLLConfig;
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76 | memset(&transportLLConfig, 0, sizeof(IOTHUBTRANSPORT_CONFIG));
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77 | transportLLConfig.upperConfig = &upperConfig;
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78 | transportLLConfig.waitingToSend = NULL;
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79 |
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80 | /*Codes_SRS_IOTHUBTRANSPORT_17_005: [ IoTHubTransport_Create shall create the lower layer transport by calling the protocol's IoTHubTransport_Create function. ]*/
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81 | result->transportLLHandle = transportProtocol->IoTHubTransport_Create(&transportLLConfig, &transport_cb, NULL);
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82 | if (result->transportLLHandle == NULL)
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83 | {
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84 | /*Codes_SRS_IOTHUBTRANSPORT_17_006: [ If the creation of the transport fails, IoTHubTransport_Create shall return NULL. ]*/
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85 | LogError("Lower Layer transport not created.");
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86 | free(result);
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87 | result = NULL;
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88 | }
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89 | else
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90 | {
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91 | /*Codes_SRS_IOTHUBTRANSPORT_17_007: [ IoTHubTransport_Create shall create the transport lock by Calling Lock_Init. ]*/
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92 | result->lockHandle = Lock_Init();
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93 | if (result->lockHandle == NULL)
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94 | {
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95 | /*Codes_SRS_IOTHUBTRANSPORT_17_008: [ If the lock creation fails, IoTHubTransport_Create shall return NULL. ]*/
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96 | LogError("transport Lock not created.");
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97 | transportProtocol->IoTHubTransport_Destroy(result->transportLLHandle);
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98 | free(result);
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99 | result = NULL;
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100 | }
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101 | else if ((result->clientsLockHandle = Lock_Init()) == NULL)
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102 | {
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103 | LogError("clients Lock not created.");
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104 | Lock_Deinit(result->lockHandle);
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105 | transportProtocol->IoTHubTransport_Destroy(result->transportLLHandle);
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106 | free(result);
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107 | result = NULL;
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108 | }
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109 | else
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110 | {
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111 | /*Codes_SRS_IOTHUBTRANSPORT_17_038: [ IoTHubTransport_Create shall call VECTOR_Create to make a list of IOTHUB_CLIENT_CORE_HANDLE using this transport. ]*/
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112 | result->clients = VECTOR_create(sizeof(IOTHUB_CLIENT_CORE_HANDLE));
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113 | if (result->clients == NULL)
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114 | {
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115 | /*Codes_SRS_IOTHUBTRANSPORT_17_039: [ If the Vector creation fails, IoTHubTransport_Create shall return NULL. ]*/
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116 | /*Codes_SRS_IOTHUBTRANSPORT_17_009: [ IoTHubTransport_Create shall clean up any resources it creates if the function does not succeed. ]*/
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117 | LogError("clients list not created.");
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118 | Lock_Deinit(result->clientsLockHandle);
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119 | Lock_Deinit(result->lockHandle);
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120 | transportProtocol->IoTHubTransport_Destroy(result->transportLLHandle);
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121 | free(result);
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122 | result = NULL;
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123 | }
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124 | else
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125 | {
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126 | /*Codes_SRS_IOTHUBTRANSPORT_17_001: [ IoTHubTransport_Create shall return a non-NULL handle on success.]*/
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127 | result->stopThread = 1;
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128 | result->clientDoWork = NULL;
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129 | result->workerThreadHandle = NULL; /* create thread when work needs to be done */
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130 | result->IoTHubTransport_GetHostname = transportProtocol->IoTHubTransport_GetHostname;
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131 | result->IoTHubTransport_SetOption = transportProtocol->IoTHubTransport_SetOption;
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132 | result->IoTHubTransport_Create = transportProtocol->IoTHubTransport_Create;
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133 | result->IoTHubTransport_Destroy = transportProtocol->IoTHubTransport_Destroy;
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134 | result->IoTHubTransport_Register = transportProtocol->IoTHubTransport_Register;
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135 | result->IoTHubTransport_Unregister = transportProtocol->IoTHubTransport_Unregister;
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136 | result->IoTHubTransport_Subscribe = transportProtocol->IoTHubTransport_Subscribe;
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137 | result->IoTHubTransport_Unsubscribe = transportProtocol->IoTHubTransport_Unsubscribe;
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138 | result->IoTHubTransport_DoWork = transportProtocol->IoTHubTransport_DoWork;
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139 | result->IoTHubTransport_SetRetryPolicy = transportProtocol->IoTHubTransport_SetRetryPolicy;
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140 | result->IoTHubTransport_GetSendStatus = transportProtocol->IoTHubTransport_GetSendStatus;
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141 | }
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142 | }
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143 | }
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144 | }
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145 | }
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146 |
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147 | return result;
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148 | }
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149 |
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150 | static void multiplexed_client_do_work(TRANSPORT_HANDLE_DATA* transportData)
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151 | {
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152 | if (Lock(transportData->clientsLockHandle) != LOCK_OK)
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153 | {
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154 | LogError("failed to lock for multiplexed_client_do_work");
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155 | }
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156 | else
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157 | {
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158 | size_t numberOfClients;
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159 | size_t iterator;
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160 |
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161 | numberOfClients = VECTOR_size(transportData->clients);
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162 | for (iterator = 0; iterator < numberOfClients; iterator++)
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163 | {
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164 | IOTHUB_CLIENT_CORE_HANDLE* clientHandle = (IOTHUB_CLIENT_CORE_HANDLE*)VECTOR_element(transportData->clients, iterator);
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165 |
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166 | if (clientHandle != NULL)
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167 | {
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168 | transportData->clientDoWork(*clientHandle);
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169 | }
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170 | }
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171 |
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172 | if (Unlock(transportData->clientsLockHandle) != LOCK_OK)
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173 | {
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174 | LogError("failed to unlock on multiplexed_client_do_work");
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175 | }
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176 | }
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177 | }
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178 |
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179 | static int transport_worker_thread(void* threadArgument)
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180 | {
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181 | TRANSPORT_HANDLE_DATA* transportData = (TRANSPORT_HANDLE_DATA*)threadArgument;
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182 |
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183 | while (1)
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184 | {
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185 | /*Codes_SRS_IOTHUBTRANSPORT_17_030: [ All calls to lower layer transport DoWork shall be protected by the lock created in IoTHubTransport_Create. ]*/
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186 | if (Lock(transportData->lockHandle) == LOCK_OK)
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187 | {
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188 | /*Codes_SRS_IOTHUBTRANSPORT_17_031: [ If acquiring the lock fails, lower layer transport DoWork shall not be called. ]*/
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189 | if (transportData->stopThread)
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190 | {
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191 | /*Codes_SRS_IOTHUBTRANSPORT_17_028: [ The thread shall exit when IoTHubTransport_EndWorkerThread has been called for each clientHandle which invoked IoTHubTransport_StartWorkerThread. ]*/
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192 | (void)Unlock(transportData->lockHandle);
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193 | break;
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194 | }
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195 | else
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196 | {
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197 | (transportData->IoTHubTransport_DoWork)(transportData->transportLLHandle);
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198 |
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199 | (void)Unlock(transportData->lockHandle);
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200 | }
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201 | }
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202 |
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203 | multiplexed_client_do_work(transportData);
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204 |
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205 | /*Codes_SRS_IOTHUBTRANSPORT_17_029: [ The thread shall call lower layer transport DoWork every 1 ms. ]*/
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206 | ThreadAPI_Sleep(1);
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207 | }
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208 |
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209 | ThreadAPI_Exit(0);
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210 | return 0;
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211 | }
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212 |
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213 | static bool find_by_handle(const void* element, const void* value)
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214 | {
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215 | /* data stored at element is device handle */
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216 | const IOTHUB_CLIENT_CORE_HANDLE * guess = (const IOTHUB_CLIENT_CORE_HANDLE *)element;
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217 | const IOTHUB_CLIENT_CORE_HANDLE match = (const IOTHUB_CLIENT_CORE_HANDLE)value;
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218 | return (*guess == match);
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219 | }
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220 |
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221 | static IOTHUB_CLIENT_RESULT start_worker_if_needed(TRANSPORT_HANDLE_DATA * transportData, IOTHUB_CLIENT_CORE_HANDLE clientHandle)
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222 | {
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223 | IOTHUB_CLIENT_RESULT result;
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224 | if (transportData->workerThreadHandle == NULL)
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225 | {
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226 | /*Codes_SRS_IOTHUBTRANSPORT_17_018: [ If the worker thread does not exist, IoTHubTransport_StartWorkerThread shall start the thread using ThreadAPI_Create. ]*/
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227 | transportData->stopThread = 0;
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228 | if (ThreadAPI_Create(&transportData->workerThreadHandle, transport_worker_thread, transportData) != THREADAPI_OK)
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229 | {
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230 | transportData->workerThreadHandle = NULL;
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231 | }
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232 | }
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233 | if (transportData->workerThreadHandle != NULL)
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234 | {
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235 | if (Lock(transportData->clientsLockHandle) != LOCK_OK)
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236 | {
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237 | LogError("failed to lock for start_worker_if_needed");
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238 | result = IOTHUB_CLIENT_ERROR;
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239 | }
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240 | else
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241 | {
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242 | /*Codes_SRS_IOTHUBTRANSPORT_17_020: [ IoTHubTransport_StartWorkerThread shall search for IoTHubClient clientHandle in the list of IoTHubClient handles. ]*/
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243 | bool addToList = ((VECTOR_size(transportData->clients) == 0) || (VECTOR_find_if(transportData->clients, find_by_handle, clientHandle) == NULL));
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244 | if (addToList)
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245 | {
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246 | /*Codes_SRS_IOTHUBTRANSPORT_17_021: [ If handle is not found, then clientHandle shall be added to the list. ]*/
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247 | if (VECTOR_push_back(transportData->clients, &clientHandle, 1) != 0)
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248 | {
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249 | LogError("Failed adding device to list (VECTOR_push_back failed)");
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250 | /*Codes_SRS_IOTHUBTRANSPORT_17_042: [ If Adding to the client list fails, IoTHubTransport_StartWorkerThread shall return IOTHUB_CLIENT_ERROR. ]*/
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251 | result = IOTHUB_CLIENT_ERROR;
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252 | }
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253 | else
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254 | {
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255 | result = IOTHUB_CLIENT_OK;
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256 | }
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257 | }
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258 | else
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259 | {
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260 | result = IOTHUB_CLIENT_OK;
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261 | }
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262 |
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263 | if (Unlock(transportData->clientsLockHandle) != LOCK_OK)
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264 | {
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265 | LogError("failed to unlock on start_worker_if_needed");
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266 | }
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267 | }
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268 | }
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269 | else
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270 | {
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271 | result = IOTHUB_CLIENT_ERROR;
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272 | }
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273 | return result;
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274 | }
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275 |
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276 | static void stop_worker_thread(TRANSPORT_HANDLE_DATA* transportData)
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277 | {
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278 | /*Codes_SRS_IOTHUBTRANSPORT_17_043: [** IoTHubTransport_SignalEndWorkerThread shall signal the worker thread to end.*/
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279 | if (Lock(transportData->lockHandle) != LOCK_OK)
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280 | {
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281 | // Need to setup a critical error function here to inform the user that an critical error
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282 | // has occured.
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283 | LogError("Unable to lock - will still attempt to end thread without thread safety");
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284 | transportData->stopThread = 1;
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285 | }
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286 | else
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287 | {
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288 | transportData->stopThread = 1;
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289 | (void)Unlock(transportData->lockHandle);
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290 | }
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291 |
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292 | }
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293 |
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294 | static void wait_worker_thread(TRANSPORT_HANDLE_DATA * transportData)
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295 | {
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296 | if (transportData->workerThreadHandle != NULL)
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297 | {
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298 | int res;
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299 | /*Codes_SRS_IOTHUBTRANSPORT_17_027: [ If handle list is empty, IoTHubTransport_EndWorkerThread shall be joined. ]*/
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300 | if (ThreadAPI_Join(transportData->workerThreadHandle, &res) != THREADAPI_OK)
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301 | {
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302 | LogError("ThreadAPI_Join failed");
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303 | }
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304 | else
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305 | {
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306 | transportData->workerThreadHandle = NULL;
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307 | }
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308 | }
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309 | }
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310 |
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311 | static bool signal_end_worker_thread(TRANSPORT_HANDLE_DATA * transportData, IOTHUB_CLIENT_CORE_HANDLE clientHandle)
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312 | {
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313 | bool okToJoin;
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314 |
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315 | if (Lock(transportData->clientsLockHandle) != LOCK_OK)
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316 | {
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317 | LogError("failed to lock for signal_end_worker_thread");
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318 | okToJoin = false;
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319 | }
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320 | else
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321 | {
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322 | void* element = VECTOR_find_if(transportData->clients, find_by_handle, clientHandle);
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323 | if (element != NULL)
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324 | {
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325 | /*Codes_SRS_IOTHUBTRANSPORT_17_026: [ IoTHubTransport_EndWorkerThread shall remove clientHandlehandle from handle list. ]*/
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326 | VECTOR_erase(transportData->clients, element, 1);
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327 | }
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328 | /*Codes_SRS_IOTHUBTRANSPORT_17_025: [ If the worker thread does not exist, then IoTHubTransport_EndWorkerThread shall return. ]*/
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329 | if (transportData->workerThreadHandle != NULL)
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330 | {
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331 | if (VECTOR_size(transportData->clients) == 0)
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332 | {
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333 | stop_worker_thread(transportData);
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334 | okToJoin = true;
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335 | }
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336 | else
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337 | {
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338 | okToJoin = false;
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339 | }
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340 | }
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341 | else
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342 | {
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343 | okToJoin = false;
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344 | }
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345 |
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346 | if (Unlock(transportData->clientsLockHandle) != LOCK_OK)
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347 | {
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348 | LogError("failed to unlock on signal_end_worker_thread");
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349 | }
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350 | }
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351 | return okToJoin;
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352 | }
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353 |
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354 | void IoTHubTransport_Destroy(TRANSPORT_HANDLE transportHandle)
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355 | {
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356 | /*Codes_SRS_IOTHUBTRANSPORT_17_011: [ IoTHubTransport_Destroy shall do nothing if transportHandle is NULL. ]*/
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357 | if (transportHandle != NULL)
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358 | {
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359 | TRANSPORT_HANDLE_DATA * transportData = (TRANSPORT_HANDLE_DATA*)transportHandle;
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360 | /*Codes_SRS_IOTHUBTRANSPORT_17_033: [ IoTHubTransport_Destroy shall lock the transport lock. ]*/
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361 | stop_worker_thread(transportData);
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362 | wait_worker_thread(transportData);
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363 | /*Codes_SRS_IOTHUBTRANSPORT_17_010: [ IoTHubTransport_Destroy shall free all resources. ]*/
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364 | Lock_Deinit(transportData->lockHandle);
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365 | (transportData->IoTHubTransport_Destroy)(transportData->transportLLHandle);
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366 | VECTOR_destroy(transportData->clients);
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367 | Lock_Deinit(transportData->clientsLockHandle);
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368 | free(transportHandle);
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369 | }
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370 | }
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371 |
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372 | LOCK_HANDLE IoTHubTransport_GetLock(TRANSPORT_HANDLE transportHandle)
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373 | {
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374 | LOCK_HANDLE lock;
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375 | if (transportHandle == NULL)
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376 | {
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377 | /*Codes_SRS_IOTHUBTRANSPORT_17_013: [ If transportHandle is NULL, IoTHubTransport_GetLock shall return NULL. ]*/
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378 | lock = NULL;
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379 | }
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380 | else
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381 | {
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382 | /*Codes_SRS_IOTHUBTRANSPORT_17_012: [ IoTHubTransport_GetLock shall return a handle to the transport lock. ]*/
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383 | TRANSPORT_HANDLE_DATA * transportData = (TRANSPORT_HANDLE_DATA*)transportHandle;
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384 | lock = transportData->lockHandle;
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385 | }
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386 | return lock;
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387 | }
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388 |
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389 | TRANSPORT_LL_HANDLE IoTHubTransport_GetLLTransport(TRANSPORT_HANDLE transportHandle)
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390 | {
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391 | TRANSPORT_LL_HANDLE llTransport;
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392 | if (transportHandle == NULL)
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393 | {
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394 | /*Codes_SRS_IOTHUBTRANSPORT_17_015: [ If transportHandle is NULL, IoTHubTransport_GetLLTransport shall return NULL. ]*/
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395 | llTransport = NULL;
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396 | }
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397 | else
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398 | {
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399 | /*Codes_SRS_IOTHUBTRANSPORT_17_014: [ IoTHubTransport_GetLLTransport shall return a handle to the lower layer transport. ]*/
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400 | TRANSPORT_HANDLE_DATA * transportData = (TRANSPORT_HANDLE_DATA*)transportHandle;
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401 | llTransport = transportData->transportLLHandle;
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402 | }
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403 | return llTransport;
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404 | }
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405 |
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406 | IOTHUB_CLIENT_RESULT IoTHubTransport_StartWorkerThread(TRANSPORT_HANDLE transportHandle, IOTHUB_CLIENT_CORE_HANDLE clientHandle, IOTHUB_CLIENT_MULTIPLEXED_DO_WORK muxDoWork)
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407 | {
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408 | IOTHUB_CLIENT_RESULT result;
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409 | if (transportHandle == NULL || clientHandle == NULL)
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410 | {
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411 | /*Codes_SRS_IOTHUBTRANSPORT_17_016: [ If transportHandle is NULL, IoTHubTransport_StartWorkerThread shall return IOTHUB_CLIENT_INVALID_ARG. ]*/
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412 | /*Codes_SRS_IOTHUBTRANSPORT_17_017: [ If clientHandle is NULL, IoTHubTransport_StartWorkerThread shall return IOTHUB_CLIENT_INVALID_ARG. ]*/
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413 | result = IOTHUB_CLIENT_INVALID_ARG;
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414 | }
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415 | else
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416 | {
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417 | TRANSPORT_HANDLE_DATA * transportData = (TRANSPORT_HANDLE_DATA*)transportHandle;
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418 |
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419 | if (transportData->clientDoWork == NULL)
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420 | {
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421 | transportData->clientDoWork = muxDoWork;
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422 | }
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423 |
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424 | if ((result = start_worker_if_needed(transportData, clientHandle)) != IOTHUB_CLIENT_OK)
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425 | {
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426 | /*Codes_SRS_IOTHUBTRANSPORT_17_019: [ If thread creation fails, IoTHubTransport_StartWorkerThread shall return IOTHUB_CLIENT_ERROR. */
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427 | LogError("Unable to start thread safely");
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428 | }
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429 | else
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430 | {
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431 | /*Codes_SRS_IOTHUBTRANSPORT_17_022: [ Upon success, IoTHubTransport_StartWorkerThread shall return IOTHUB_CLIENT_OK. ]*/
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432 | result = IOTHUB_CLIENT_OK;
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433 | }
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434 | }
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435 | return result;
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436 | }
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437 |
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438 | bool IoTHubTransport_SignalEndWorkerThread(TRANSPORT_HANDLE transportHandle, IOTHUB_CLIENT_CORE_HANDLE clientHandle)
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439 | {
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440 | bool okToJoin;
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441 | /*Codes_SRS_IOTHUBTRANSPORT_17_023: [ If transportHandle is NULL, IoTHubTransport_EndWorkerThread shall return. ]*/
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442 | /*Codes_SRS_IOTHUBTRANSPORT_17_024: [ If clientHandle is NULL, IoTHubTransport_EndWorkerThread shall return. ]*/
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443 | if (!(transportHandle == NULL || clientHandle == NULL))
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444 | {
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445 | TRANSPORT_HANDLE_DATA * transportData = (TRANSPORT_HANDLE_DATA*)transportHandle;
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446 | okToJoin = signal_end_worker_thread(transportData, clientHandle);
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447 | }
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448 | else
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449 | {
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450 | okToJoin = false;
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451 | }
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452 | return okToJoin;
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453 | }
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454 |
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455 | void IoTHubTransport_JoinWorkerThread(TRANSPORT_HANDLE transportHandle, IOTHUB_CLIENT_CORE_HANDLE clientHandle)
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456 | {
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457 | /*Codes_SRS_IOTHUBTRANSPORT_17_044: [ If transportHandle is NULL, IoTHubTransport_JoinWorkerThread shall do nothing. ]*/
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458 | /*Codes_SRS_IOTHUBTRANSPORT_17_045: [ If clientHandle is NULL, IoTHubTransport_JoinWorkerThread shall do nothing. ]*/
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459 | if (!(transportHandle == NULL || clientHandle == NULL))
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460 | {
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461 | TRANSPORT_HANDLE_DATA * transportData = (TRANSPORT_HANDLE_DATA*)transportHandle;
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462 | /*Codes_SRS_IOTHUBTRANSPORT_17_027: [ The worker thread shall be joined. ]*/
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463 | wait_worker_thread(transportData);
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464 | }
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465 | }
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