mirror of
https://github.com/Valeh2012/PersonalVotingMachine
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91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
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/**
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* @file RPCModule.cpp
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* @brief RPC implementation file
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* */
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#include "string.h"
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#include "module.h"
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RPC::RPC(){
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this->cfg = new esp_tls_cfg_t();
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this->server = NULL;
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this->port = 443;
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};
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cJSON * RPC::send_json_rpc(const char* sni, char* req){
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static char buf[512]; // tls connection buffer to read response
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int length = 1024;
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char *res; // buffer to store whole response body
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res = (char *) malloc(length);
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memset(res, 0, length);
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int ret, len;
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/* tls connection config. */
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cfg->common_name = sni; //! set SNI extension
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struct esp_tls *tls = esp_tls_conn_new(server, strlen(server),port, cfg); //! connect to defined address
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if(tls != NULL){
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ESP_LOGI(TLS_TAG, "Connection established with %s", sni);
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} else {
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printf("available memory: %d\n", (int) heap_caps_get_free_size(MALLOC_CAP_32BIT | MALLOC_CAP_8BIT));
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ESP_LOGE(TLS_TAG, "Connection failed...");
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throw "Connection failed";
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}
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size_t written_bytes = 0;
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do {
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ret = esp_tls_conn_write(tls, req + written_bytes, strlen(req) - written_bytes); //! send rpc data
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if(ret >= 0){
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written_bytes += ret;
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} else if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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ESP_LOGE(TLS_TAG, "esp_tls_conn_write returned 0x%x", ret);
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esp_tls_conn_delete(tls);
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}
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} while(written_bytes < strlen(req));
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do{
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len = sizeof(buf) - 1;
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bzero(buf, sizeof(buf));
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ret = esp_tls_conn_read(tls, (char *)buf, len); //! recieve response in chunks
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if(ret == MBEDTLS_ERR_SSL_WANT_WRITE || ret == MBEDTLS_ERR_SSL_WANT_READ)
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continue;
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if(ret < 0){
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ESP_LOGE(TLS_TAG, "esp_tls_conn_read returned -0x%x", -ret);
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break;
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}
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if(ret == 0){
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ESP_LOGI(TLS_TAG, "connection closed");
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break;
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}
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len = ret;
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ESP_LOGD(TLS_TAG, "%d bytes read", len);
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if(strlen(res) + len + 1 >= length){ //! In case no enough memory, extend res buffer
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length += len; //! * increase by amount required
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res = (char*) realloc(res, length); //! * reallocate memory
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memset(res+length-len,0,len); //! * set new memory blocks 0 to assure the result is null-terminate string
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}
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memcpy(res + strlen(res), buf, len); //! write chunked response to buffer
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} while(1);
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cJSON *tmp = cJSON_Parse(res); //! parse response JSON into cJSON struct
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free(res);
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free(req);
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esp_tls_conn_delete(tls);
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return tmp;
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}
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RPC& RPC::Instance(){
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static RPC instance;
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return instance;
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}
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