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 <stddef.h>
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6 | #include <stdio.h>
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7 | #include <string.h>
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8 | #include "azure_c_shared_utility/socketio.h"
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9 | #include "azure_c_shared_utility/singlylinkedlist.h"
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10 | #include "azure_c_shared_utility/esp_at_socket.h"
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11 | #include "azure_c_shared_utility/optimize_size.h"
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12 | #include "azure_c_shared_utility/xlogging.h"
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13 |
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14 | #define ESP_AT_XIO_RECEIVE_BUFFER_SIZE 128
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15 |
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16 | typedef enum IO_STATE_TAG
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17 | {
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18 | IO_STATE_CLOSED,
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19 | IO_STATE_OPENING,
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20 | IO_STATE_OPEN,
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21 | IO_STATE_CLOSING,
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22 | IO_STATE_ERROR
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23 | } IO_STATE;
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24 |
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25 | typedef struct PENDING_SOCKET_IO_TAG
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26 | {
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27 | unsigned char* bytes;
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28 | size_t size;
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29 | ON_SEND_COMPLETE on_send_complete;
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30 | void* callback_context;
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31 | SINGLYLINKEDLIST_HANDLE pending_io_list;
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32 | } PENDING_SOCKET_IO;
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33 |
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34 | typedef struct SOCKET_IO_INSTANCE_TAG
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35 | {
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36 | ESP_AT_SOCKET_HANDLE tcp_socket_connection;
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37 | ON_BYTES_RECEIVED on_bytes_received;
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38 | ON_IO_ERROR on_io_error;
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39 | void* on_bytes_received_context;
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40 | void* on_io_error_context;
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41 | char* hostname;
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42 | int port;
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43 | IO_STATE io_state;
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44 | SINGLYLINKEDLIST_HANDLE pending_io_list;
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45 | } SOCKET_IO_INSTANCE;
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46 |
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47 | CONCRETE_IO_HANDLE socketio_esp_at_create(void* io_create_parameters);
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48 | void socketio_esp_at_destroy(CONCRETE_IO_HANDLE socket_io);
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49 | int socketio_esp_at_open(CONCRETE_IO_HANDLE socket_io, ON_IO_OPEN_COMPLETE on_io_open_complete, void* on_io_open_complete_context, ON_BYTES_RECEIVED on_bytes_received, void* on_bytes_received_context, ON_IO_ERROR on_io_error, void* on_io_error_context);
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50 | int socketio_esp_at_close(CONCRETE_IO_HANDLE socket_io, ON_IO_CLOSE_COMPLETE on_io_close_complete, void* callback_context);
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51 | int socketio_esp_at_send(CONCRETE_IO_HANDLE socket_io, const void* buffer, size_t size, ON_SEND_COMPLETE on_send_complete, void* callback_context);
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52 | void socketio_esp_at_dowork(CONCRETE_IO_HANDLE socket_io);
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53 | int socketio_esp_at_setoption(CONCRETE_IO_HANDLE socket_io, const char* optionName, const void* value);
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54 |
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55 | /*this function will clone an option given by name and value*/
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56 | static void* socketio_esp_at_CloneOption(const char* name, const void* value)
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57 | {
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58 | (void)name;
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59 | (void)value;
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60 | return NULL;
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61 | }
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62 |
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63 | /*this function destroys an option previously created*/
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64 | static void socketio_esp_at_DestroyOption(const char* name, const void* value)
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65 | {
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66 | (void)name;
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67 | (void)value;
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68 | }
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69 |
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70 | static OPTIONHANDLER_HANDLE socketio_esp_at_retrieveoptions(CONCRETE_IO_HANDLE socket_io)
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71 | {
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72 | OPTIONHANDLER_HANDLE result;
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73 | (void)socket_io;
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74 | result = OptionHandler_Create(socketio_esp_at_CloneOption, socketio_esp_at_DestroyOption, socketio_esp_at_setoption);
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75 | if (result == NULL)
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76 | {
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77 | /*return as is*/
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78 | }
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79 | else
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80 | {
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81 | /*insert here work to add the options to "result" handle*/
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82 | }
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83 | return result;
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84 | }
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85 |
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86 | static const IO_INTERFACE_DESCRIPTION socket_io_interface_description =
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87 | {
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88 | socketio_esp_at_retrieveoptions,
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89 | socketio_esp_at_create,
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90 | socketio_esp_at_destroy,
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91 | socketio_esp_at_open,
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92 | socketio_esp_at_close,
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93 | socketio_esp_at_send,
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94 | socketio_esp_at_dowork,
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95 | socketio_esp_at_setoption
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96 | };
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97 |
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98 | static void indicate_error(SOCKET_IO_INSTANCE* socket_io_instance)
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99 | {
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100 | if ((socket_io_instance->io_state == IO_STATE_CLOSED)
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101 | || (socket_io_instance->io_state == IO_STATE_ERROR))
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102 | {
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103 | return;
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104 | }
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105 | socket_io_instance->io_state = IO_STATE_ERROR;
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106 | if (socket_io_instance->on_io_error != NULL)
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107 | {
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108 | socket_io_instance->on_io_error(socket_io_instance->on_io_error_context);
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109 | }
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110 | }
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111 |
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112 | static int add_pending_io(SOCKET_IO_INSTANCE* socket_io_instance, const unsigned char* buffer, size_t size, ON_SEND_COMPLETE on_send_complete, void* callback_context)
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113 | {
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114 | int result;
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115 | PENDING_SOCKET_IO* pending_socket_io = (PENDING_SOCKET_IO*)malloc(sizeof(PENDING_SOCKET_IO));
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116 | if (pending_socket_io == NULL)
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117 | {
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118 | LogError("Allocation Failure: Unable to allocate pending list.");
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119 | result = MU_FAILURE;
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120 | }
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121 | else
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122 | {
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123 | pending_socket_io->bytes = (unsigned char*)malloc(size);
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124 | if (pending_socket_io->bytes == NULL)
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125 | {
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126 | LogError("Allocation Failure: Unable to allocate pending list.");
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127 | free(pending_socket_io);
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128 | result = MU_FAILURE;
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129 | }
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130 | else
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131 | {
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132 | pending_socket_io->size = size;
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133 | pending_socket_io->on_send_complete = on_send_complete;
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134 | pending_socket_io->callback_context = callback_context;
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135 | pending_socket_io->pending_io_list = socket_io_instance->pending_io_list;
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136 | (void)memcpy(pending_socket_io->bytes, buffer, size);
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137 | if (singlylinkedlist_add(socket_io_instance->pending_io_list, pending_socket_io) == NULL)
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138 | {
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139 | LogError("Failure: Unable to add socket to pending list.");
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140 | free(pending_socket_io->bytes);
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141 | free(pending_socket_io);
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142 | result = MU_FAILURE;
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143 | }
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144 | else
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145 | {
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146 | result = 0;
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147 | }
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148 | }
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149 | }
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150 |
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151 | return result;
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152 | }
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153 |
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154 | #define NSAPI_ERROR_WOULD_BLOCK -3001
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155 |
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156 | static int retrieve_data(SOCKET_IO_INSTANCE* socket_io_instance)
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157 | {
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158 | int received = 1;
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159 | int total_received = 0;
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160 |
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161 | unsigned char* recv_bytes = malloc(ESP_AT_XIO_RECEIVE_BUFFER_SIZE);
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162 | if (recv_bytes == NULL)
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163 | {
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164 | LogError("Socketio_Failure: NULL allocating input buffer.");
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165 | indicate_error(socket_io_instance);
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166 | return -1;
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167 | }
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168 |
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169 | while (received > 0)
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170 | {
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171 | received = esp_at_socket_receive(socket_io_instance->tcp_socket_connection, (char*)recv_bytes, ESP_AT_XIO_RECEIVE_BUFFER_SIZE);
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172 | if (received > 0)
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173 | {
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174 | total_received += received;
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175 | if (socket_io_instance->on_bytes_received != NULL)
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176 | {
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177 | /* explictly ignoring here the result of the callback */
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178 | socket_io_instance->on_bytes_received(socket_io_instance->on_bytes_received_context, recv_bytes, received);
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179 | }
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180 | }
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181 | else if (received < 0)
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182 | {
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183 | if(received != NSAPI_ERROR_WOULD_BLOCK) // NSAPI_ERROR_WOULD_BLOCK is not a real error but pending.
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184 | {
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185 | indicate_error(socket_io_instance);
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186 | LogError("Socketio_Failure: underlying IO error %d.", received);
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187 | free(recv_bytes);
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188 | return -1;
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189 | }
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190 | }
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191 | }
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192 | free(recv_bytes);
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193 |
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194 | return total_received;
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195 | }
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196 |
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197 | static int send_queued_data(SOCKET_IO_INSTANCE* socket_io_instance)
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198 | {
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199 | int errors = 0;
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200 | int sent = 0;
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201 |
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202 | LIST_ITEM_HANDLE first_pending_io = singlylinkedlist_get_head_item(socket_io_instance->pending_io_list);
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203 | while (first_pending_io != NULL)
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204 | {
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205 | PENDING_SOCKET_IO* pending_socket_io = (PENDING_SOCKET_IO*)singlylinkedlist_item_get_value(first_pending_io);
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206 | if (pending_socket_io == NULL)
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207 | {
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208 | indicate_error(socket_io_instance);
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209 | return -1;
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210 | }
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211 |
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212 | int send_result = esp_at_socket_send(socket_io_instance->tcp_socket_connection, (const char*)pending_socket_io->bytes, pending_socket_io->size);
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213 | if (send_result != (int)pending_socket_io->size)
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214 | {
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215 | if (send_result == 0)
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216 | {
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217 | // The underlying network layer may encounter hardware / environment issues,
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218 | // but the driver doesn't handle it properly. So here the send API always return 0,
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219 | // this causes the program running into dead loop if not check it here.
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220 | if (errors++ >= 10)
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221 | {
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222 | // Treat it as a network error after try 10 times.
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223 | LogError("Socketio_Failure: encountered unknow connection issue, the connection will be restarted.");
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224 | indicate_error(socket_io_instance);
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225 | return -1;
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226 | }
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227 | ThreadAPI_Sleep(10);
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228 | }
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229 | else if (send_result < 0)
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230 | {
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231 | indicate_error(socket_io_instance);
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232 | return -1;
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233 | }
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234 | else
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235 | {
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236 | /* send something, wait for the rest */
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237 | memmove(pending_socket_io->bytes, pending_socket_io->bytes + send_result, pending_socket_io->size - send_result);
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238 | sent += send_result;
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239 | }
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240 | }
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241 | else
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242 | {
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243 | sent += send_result;
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244 | if (pending_socket_io->on_send_complete != NULL)
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245 | {
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246 | pending_socket_io->on_send_complete(pending_socket_io->callback_context, IO_SEND_OK);
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247 | }
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248 |
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249 | free(pending_socket_io->bytes);
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250 | free(pending_socket_io);
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251 | if (singlylinkedlist_remove(socket_io_instance->pending_io_list, first_pending_io) != 0)
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252 | {
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253 | indicate_error(socket_io_instance);
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254 | return -1;
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255 | }
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256 | errors = 0;
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257 | }
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258 |
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259 | first_pending_io = singlylinkedlist_get_head_item(socket_io_instance->pending_io_list);
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260 | }
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261 |
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262 | return sent;
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263 | }
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264 |
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265 | static void close_tcp_connection(SOCKET_IO_INSTANCE* socket_io_instance)
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266 | {
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267 | if (socket_io_instance->io_state != IO_STATE_CLOSED)
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268 | {
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269 | if (socket_io_instance->tcp_socket_connection != NULL)
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270 | {
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271 | esp_at_socket_close(socket_io_instance->tcp_socket_connection);
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272 | esp_at_socket_destroy(socket_io_instance->tcp_socket_connection);
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273 | socket_io_instance->tcp_socket_connection = NULL;
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274 | }
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275 | socket_io_instance->io_state = IO_STATE_CLOSED;
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276 | }
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277 | }
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278 |
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279 | CONCRETE_IO_HANDLE socketio_esp_at_create(void* io_create_parameters)
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280 | {
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281 | SOCKETIO_CONFIG* socket_io_config = io_create_parameters;
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282 | SOCKET_IO_INSTANCE* result;
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283 |
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284 | if (socket_io_config == NULL)
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285 | {
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286 | result = NULL;
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287 | }
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288 | else
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289 | {
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290 | result = (SOCKET_IO_INSTANCE*)malloc(sizeof(SOCKET_IO_INSTANCE));
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291 | if (result == NULL){
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292 | LogError("Socketio_Failure: NULL allocating socket io instance.");
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293 | }
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294 | else
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295 | {
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296 | result->pending_io_list = singlylinkedlist_create();
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297 | if (result->pending_io_list == NULL)
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298 | {
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299 | free(result);
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300 | result = NULL;
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301 | }
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302 | else
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303 | {
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304 | result->hostname = strdup(socket_io_config->hostname);
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305 | if (result->hostname == NULL)
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306 | {
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307 | singlylinkedlist_destroy(result->pending_io_list);
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308 | free(result);
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309 | result = NULL;
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310 | }
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311 | else
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312 | {
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313 | result->port = socket_io_config->port;
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314 | result->on_bytes_received = NULL;
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315 | result->on_io_error = NULL;
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316 | result->on_bytes_received_context = NULL;
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317 | result->on_io_error_context = NULL;
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318 | result->io_state = IO_STATE_CLOSED;
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319 | result->tcp_socket_connection = NULL;
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320 | }
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321 | }
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322 | }
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323 | }
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324 |
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325 | return result;
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326 | }
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327 |
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328 | void socketio_esp_at_destroy(CONCRETE_IO_HANDLE socket_io)
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329 | {
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330 | if (socket_io != NULL)
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331 | {
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332 | SOCKET_IO_INSTANCE* socket_io_instance = (SOCKET_IO_INSTANCE*)socket_io;
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333 |
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334 | // Close the tcp connection
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335 | close_tcp_connection(socket_io_instance);
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336 |
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337 | // Clear all pending IOs
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338 | LIST_ITEM_HANDLE first_pending_io = singlylinkedlist_get_head_item(socket_io_instance->pending_io_list);
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339 | while (first_pending_io != NULL)
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340 | {
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341 | PENDING_SOCKET_IO* pending_socket_io = (PENDING_SOCKET_IO*)singlylinkedlist_item_get_value(first_pending_io);
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342 | if (pending_socket_io != NULL)
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343 | {
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344 | free(pending_socket_io->bytes);
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345 | free(pending_socket_io);
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346 | }
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347 |
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348 | (void)singlylinkedlist_remove(socket_io_instance->pending_io_list, first_pending_io);
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349 | first_pending_io = singlylinkedlist_get_head_item(socket_io_instance->pending_io_list);
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350 | }
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351 | singlylinkedlist_destroy(socket_io_instance->pending_io_list);
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352 |
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353 | if(socket_io_instance->hostname != NULL)
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354 | {
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355 | free(socket_io_instance->hostname);
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356 | socket_io_instance->hostname = NULL;
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357 | }
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358 | free(socket_io);
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359 | }
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360 | }
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361 |
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362 | int socketio_esp_at_open(CONCRETE_IO_HANDLE socket_io, ON_IO_OPEN_COMPLETE on_io_open_complete, void* on_io_open_complete_context, ON_BYTES_RECEIVED on_bytes_received, void* on_bytes_received_context, ON_IO_ERROR on_io_error, void* on_io_error_context)
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363 | {
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364 | int result;
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365 | SOCKET_IO_INSTANCE* socket_io_instance = (SOCKET_IO_INSTANCE*)socket_io;
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366 |
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367 |
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368 | if (socket_io_instance == NULL ||
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369 | socket_io_instance->io_state != IO_STATE_CLOSED)
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370 | {
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371 | result = MU_FAILURE;
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372 | }
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373 | else
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374 | {
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375 | socket_io_instance->tcp_socket_connection = esp_at_socket_create(false);
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376 | if (socket_io_instance->tcp_socket_connection == NULL)
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377 | {
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378 | result = MU_FAILURE;
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379 | }
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380 | else
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381 | {
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382 | if (esp_at_socket_connect(socket_io_instance->tcp_socket_connection, socket_io_instance->hostname, socket_io_instance->port) != 0)
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383 | {
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384 | esp_at_socket_destroy(socket_io_instance->tcp_socket_connection);
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385 | socket_io_instance->tcp_socket_connection = NULL;
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386 | result = MU_FAILURE;
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387 | }
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388 | else
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389 | {
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390 | esp_at_socket_set_blocking(socket_io_instance->tcp_socket_connection, false, 0);
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391 |
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392 | socket_io_instance->on_bytes_received = on_bytes_received;
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393 | socket_io_instance->on_bytes_received_context = on_bytes_received_context;
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394 |
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395 | socket_io_instance->on_io_error = on_io_error;
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396 | socket_io_instance->on_io_error_context = on_io_error_context;
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397 |
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398 | socket_io_instance->io_state = IO_STATE_OPEN;
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399 |
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400 | result = 0;
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401 | }
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402 | }
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403 | }
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404 |
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405 | if (on_io_open_complete != NULL)
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406 | {
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407 | on_io_open_complete(on_io_open_complete_context, result == 0 ? IO_OPEN_OK : IO_OPEN_ERROR);
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408 | }
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409 |
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410 | return result;
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411 | }
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412 |
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413 | int socketio_esp_at_close(CONCRETE_IO_HANDLE socket_io, ON_IO_CLOSE_COMPLETE on_io_close_complete, void* callback_context)
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414 | {
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415 | int result = 0;
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416 |
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417 | if (socket_io == NULL)
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418 | {
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419 | result = MU_FAILURE;
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420 | }
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421 | else
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422 | {
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423 | SOCKET_IO_INSTANCE* socket_io_instance = (SOCKET_IO_INSTANCE*)socket_io;
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424 | if (socket_io_instance->io_state == IO_STATE_CLOSED ||
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425 | socket_io_instance->io_state == IO_STATE_ERROR)
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426 | {
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427 | result = MU_FAILURE;
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428 | }
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429 | else
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430 | {
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431 | close_tcp_connection(socket_io_instance);
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432 | if (on_io_close_complete != NULL)
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433 | {
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434 | on_io_close_complete(callback_context);
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435 | }
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436 | result = 0;
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437 | }
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438 | }
|
---|
439 |
|
---|
440 | return result;
|
---|
441 | }
|
---|
442 |
|
---|
443 | int socketio_esp_at_send(CONCRETE_IO_HANDLE socket_io, const void* buffer, size_t size, ON_SEND_COMPLETE on_send_complete, void* callback_context)
|
---|
444 | {
|
---|
445 | int result;
|
---|
446 |
|
---|
447 | if ((socket_io == NULL) ||
|
---|
448 | (buffer == NULL) ||
|
---|
449 | (size == 0))
|
---|
450 | {
|
---|
451 | /* Invalid arguments */
|
---|
452 | result = MU_FAILURE;
|
---|
453 | }
|
---|
454 | else
|
---|
455 | {
|
---|
456 | result = 0;
|
---|
457 |
|
---|
458 | SOCKET_IO_INSTANCE* socket_io_instance = (SOCKET_IO_INSTANCE*)socket_io;
|
---|
459 | if (socket_io_instance->io_state != IO_STATE_OPEN)
|
---|
460 | {
|
---|
461 | result = MU_FAILURE;
|
---|
462 | }
|
---|
463 | else
|
---|
464 | {
|
---|
465 | // Queue the data, and the socketio_esp_at_dowork sends the package later
|
---|
466 | if (add_pending_io(socket_io_instance, buffer, size, on_send_complete, callback_context) != 0)
|
---|
467 | {
|
---|
468 | result = MU_FAILURE;
|
---|
469 | }
|
---|
470 | }
|
---|
471 | }
|
---|
472 |
|
---|
473 | return result;
|
---|
474 | }
|
---|
475 |
|
---|
476 | void socketio_esp_at_dowork(CONCRETE_IO_HANDLE socket_io)
|
---|
477 | {
|
---|
478 | if (socket_io != NULL)
|
---|
479 | {
|
---|
480 | SOCKET_IO_INSTANCE* socket_io_instance = (SOCKET_IO_INSTANCE*)socket_io;
|
---|
481 | if (socket_io_instance->io_state == IO_STATE_OPEN)
|
---|
482 | {
|
---|
483 | // Retrieve all data from IoT Hub
|
---|
484 | if (retrieve_data(socket_io_instance) < 0)
|
---|
485 | {
|
---|
486 | return;
|
---|
487 | }
|
---|
488 |
|
---|
489 | // Send all packages in the queue
|
---|
490 | send_queued_data(socket_io_instance);
|
---|
491 | }
|
---|
492 | }
|
---|
493 | }
|
---|
494 |
|
---|
495 | int socketio_esp_at_setoption(CONCRETE_IO_HANDLE socket_io, const char* optionName, const void* value)
|
---|
496 | {
|
---|
497 | /* Not implementing any options, do nothing */
|
---|
498 | return OPTIONHANDLER_OK;
|
---|
499 | }
|
---|
500 |
|
---|
501 | const IO_INTERFACE_DESCRIPTION* socketio_esp_at_get_interface_description(void)
|
---|
502 | {
|
---|
503 | return &socket_io_interface_description;
|
---|
504 | }
|
---|