AI-on-the-edge-device/code/src/server_main.cpp

#include "server_main.h"

#include <string>

#include "server_help.h"
#include "ClassLogFile.h"

#include "time_sntp.h"

#include "version.h"


httpd_handle_t server = NULL;   


std::string starttime = "";


/* An HTTP GET handler */
esp_err_t info_get_handler(httpd_req_t *req)
{
    LogFile.WriteToFile("info_get_handler");    
    char _query[200];
    char _valuechar[30];    
    std::string _task;

    if (httpd_req_get_url_query_str(req, _query, 200) == ESP_OK)
    {
        printf("Query: "); printf(_query); printf("\n");
        
        if (httpd_query_key_value(_query, "type", _valuechar, 30) == ESP_OK)
        {
            printf("type is found"); printf(_valuechar); printf("\n"); 
            _task = std::string(_valuechar);
        }
    };

    if (_task.compare("GitBranch") == 0)
    {
        std::string zw;
        zw = std::string(libfive_git_branch());
        httpd_resp_sendstr_chunk(req, zw.c_str());
        httpd_resp_sendstr_chunk(req, NULL);  
        return ESP_OK;        
    }


    if (_task.compare("GitTag") == 0)
    {
        std::string zw;
        zw = std::string(libfive_git_version());
        httpd_resp_sendstr_chunk(req, zw.c_str());
        httpd_resp_sendstr_chunk(req, NULL);  
        return ESP_OK;        
    }



    if (_task.compare("GitRevision") == 0)
    {
        std::string zw;
        zw = std::string(libfive_git_revision());
        httpd_resp_sendstr_chunk(req, zw.c_str());
        httpd_resp_sendstr_chunk(req, NULL);  
        return ESP_OK;        
    }

    if (_task.compare("BuildTime") == 0)
    {
        std::string zw;
        zw = std::string(build_time());
        httpd_resp_sendstr_chunk(req, zw.c_str());
        httpd_resp_sendstr_chunk(req, NULL);  
        return ESP_OK;        
    }

    if (_task.compare("GitBaseBranch") == 0)
    {
        std::string zw;
        zw = std::string(git_base_branch());
        httpd_resp_sendstr_chunk(req, zw.c_str());
        httpd_resp_sendstr_chunk(req, NULL);  
        return ESP_OK;        
    }


    return ESP_OK;
}

esp_err_t starttime_get_handler(httpd_req_t *req)
{
    httpd_resp_send(req, starttime.c_str(), strlen(starttime.c_str())); 
    /* Respond with an empty chunk to signal HTTP response completion */
    httpd_resp_send_chunk(req, NULL, 0);     

    return ESP_OK;
}

esp_err_t hello_main_handler(httpd_req_t *req)
{
    char filepath[50];
    struct stat file_stat;
    printf("uri: %s\n", req->uri);
    int _pos;

    char *base_path = (char*) req->user_ctx;
    std::string filetosend(base_path);

    const char *filename = get_path_from_uri(filepath, base_path,
                                             req->uri - 1, sizeof(filepath));    
    printf("1 uri: %s, filename: %s, filepath: %s\n", req->uri, filename, filepath);

    if ((strcmp(req->uri, "/") == 0))
    {
        filetosend = filetosend + "/html/index.html";
    }
    else
    {
        filetosend = filetosend + "/html" + std::string(req->uri);
        _pos = filetosend.find("?");
        if (_pos > -1){
            filetosend = filetosend.substr(0, _pos);
        }
    }

    printf("Filename: %s\n", filename);
    
    printf("File requested: %s\n", filetosend.c_str());    

    if (!filename) {
        ESP_LOGE(TAG, "Filename is too long");
        /* Respond with 500 Internal Server Error */
        httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "Filename too long");
        return ESP_FAIL;
    }
    if (stat(filetosend.c_str(), &file_stat) == -1) {
        /* If file not present on SPIFFS check if URI
         * corresponds to one of the hardcoded paths */
        ESP_LOGE(TAG, "Failed to stat file : %s", filetosend.c_str());
        /* Respond with 404 Not Found */
        httpd_resp_send_err(req, HTTPD_404_NOT_FOUND, "File does not exist");
        return ESP_FAIL;
    }
    esp_err_t res;
    res = httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
    if (res != ESP_OK)
        return res;

    res = send_file(req, filetosend, &file_stat);
    if (res != ESP_OK)
        return res;

    /* Respond with an empty chunk to signal HTTP response completion */
    httpd_resp_send_chunk(req, NULL, 0);
    return ESP_OK;
}



esp_err_t img_tmp_handler(httpd_req_t *req)
{
    char filepath[50];
    struct stat file_stat;
    printf("uri: %s\n", req->uri);

    char *base_path = (char*) req->user_ctx;
    std::string filetosend(base_path);

    const char *filename = get_path_from_uri(filepath, base_path,
                                             req->uri  + sizeof("/img_tmp") - 1, sizeof(filepath));    
    printf("1 uri: %s, filename: %s, filepath: %s\n", req->uri, filename, filepath);

    filetosend = filetosend + "/img_tmp/" + std::string(filename);
    printf("File to upload: %s\n", filetosend.c_str());    

    if (!filename) {
        ESP_LOGE(TAG, "Filename is too long");
        /* Respond with 500 Internal Server Error */
        httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "Filename too long");
        return ESP_FAIL;
    }
    if (stat(filetosend.c_str(), &file_stat) == -1) {
        /* If file not present on SPIFFS check if URI
         * corresponds to one of the hardcoded paths */
        ESP_LOGE(TAG, "Failed to stat file : %s", filetosend.c_str());
        /* Respond with 404 Not Found */
        httpd_resp_send_err(req, HTTPD_404_NOT_FOUND, "File does not exist");
        return ESP_FAIL;
    }

    esp_err_t res = send_file(req, filetosend, &file_stat);
    if (res != ESP_OK)
        return res;

    /* Respond with an empty chunk to signal HTTP response completion */
    httpd_resp_send_chunk(req, NULL, 0);
    return ESP_OK;
}



void register_server_main_uri(httpd_handle_t server, const char *base_path)
{
    httpd_uri_t info_get_handle = {
        .uri       = "/version",  // Match all URIs of type /path/to/file
        .method    = HTTP_GET,
        .handler   = info_get_handler,
        .user_ctx  = (void*) base_path    // Pass server data as context
    };
    httpd_register_uri_handler(server, &info_get_handle);


    httpd_uri_t starttime_tmp_handle = {
        .uri       = "/starttime",  // Match all URIs of type /path/to/file
        .method    = HTTP_GET,
        .handler   = starttime_get_handler,
        .user_ctx  = NULL    // Pass server data as context
    };
    httpd_register_uri_handler(server, &starttime_tmp_handle);


    httpd_uri_t img_tmp_handle = {
        .uri       = "/img_tmp/*",  // Match all URIs of type /path/to/file
        .method    = HTTP_GET,
        .handler   = img_tmp_handler,
        .user_ctx  = (void*) base_path    // Pass server data as context
    };
    httpd_register_uri_handler(server, &img_tmp_handle);


    httpd_uri_t main_rest_handle = {
        .uri       = "/*",  // Match all URIs of type /path/to/file
        .method    = HTTP_GET,
        .handler   = hello_main_handler,
        .user_ctx  = (void*) base_path    // Pass server data as context
    };
    httpd_register_uri_handler(server, &main_rest_handle);
}



httpd_handle_t start_webserver(void)
{
    httpd_handle_t server = NULL;
    httpd_config_t config = { };

    config.task_priority      = tskIDLE_PRIORITY+5;
    config.stack_size         = 16384;                  // bei 32k stürzt das Programm beim Bilderaufnehmen ab
    config.core_id            = tskNO_AFFINITY;
    config.server_port        = 80;
    config.ctrl_port          = 32768;
    config.max_open_sockets   = 7;      
    config.max_uri_handlers   = 24;                       
    config.max_resp_headers   = 8;                        
    config.backlog_conn       = 5;                        
    config.lru_purge_enable   = false;                    
    config.recv_wait_timeout  = 30;         // default: 5                       
    config.send_wait_timeout  = 30;         // default: 5                        
    config.global_user_ctx = NULL;                        
    config.global_user_ctx_free_fn = NULL;                
    config.global_transport_ctx = NULL;                   
    config.global_transport_ctx_free_fn = NULL;           
    config.open_fn = NULL;                                
    config.close_fn = NULL;                               
//    config.uri_match_fn = NULL;                            
    config.uri_match_fn = httpd_uri_match_wildcard;

    starttime = gettimestring("%Y%m%d-%H%M%S");

    // Start the httpd server
    ESP_LOGI(TAG, "Starting server on port: '%d'", config.server_port);
    if (httpd_start(&server, &config) == ESP_OK) {
        // Set URI handlers
        ESP_LOGI(TAG, "Registering URI handlers");
        return server;
    }

    ESP_LOGI(TAG, "Error starting server!");
    return NULL;
}

void stop_webserver(httpd_handle_t server)
{
    httpd_stop(server);
}


void disconnect_handler(void* arg, esp_event_base_t event_base, 
                               int32_t event_id, void* event_data)
{
    httpd_handle_t* server = (httpd_handle_t*) arg;
    if (*server) {
        ESP_LOGI(TAG, "Stopping webserver");
        stop_webserver(*server);
        *server = NULL;
    }
}

void connect_handler(void* arg, esp_event_base_t event_base, 
                            int32_t event_id, void* event_data)
{
    httpd_handle_t* server = (httpd_handle_t*) arg;
    if (*server == NULL) {
        ESP_LOGI(TAG, "Starting webserver");
        *server = start_webserver();
    }
}