Added info and reboot api into the backend. Created the basics for a backend server.

Provider/main/api/system/info.cpp

@@ -1,14 +1,17 @@
-#pragma once
+// SDK
-
 #include "cJSON.h"
 #include "esp_app_format.h"
+#include "esp_chip_info.h"
 #include "esp_http_server.h"
 #include "esp_ota_ops.h"
 #include "esp_system.h"
 #include "esp_timer.h"
 
+// Project
+#include "appstate.hpp"
+#include "types.hpp"
 
-static esp_err_t api_system_info_handler(httpd_req_t *req) {
+internal esp_err_t api_system_info_handler(httpd_req_t *req) {
   httpd_resp_set_type(req, "application/json");
 
   cJSON *root = cJSON_CreateObject();
@@ -38,14 +41,10 @@ static esp_err_t api_system_info_handler(httpd_req_t *req) {
   const esp_app_desc_t *app_desc = esp_app_get_description();
   cJSON_AddStringToObject(root, "firmware", app_desc->version);
 
-  // Relying on internal variables from main.cpp due to unity build
-  extern bool ethernetInitialized;
-  extern bool wifiInitialized;
-
   const char *conn_type = "offline";
-  if (ethernetInitialized) {
+  if (g_Ethernet_Initialized) {
     conn_type = "ethernet";
-  } else if (wifiInitialized) {
+  } else if (g_Wifi_Initialized) {
     conn_type = "wifi";
   }
   cJSON_AddStringToObject(root, "connection", conn_type);
@@ -59,7 +58,7 @@ static esp_err_t api_system_info_handler(httpd_req_t *req) {
   return ESP_OK;
 }
 
-static const httpd_uri_t api_system_info_uri = {.uri = "/api/system/info",
+internal const httpd_uri_t api_system_info_uri = {.uri = "/api/system/info",
                                                   .method = HTTP_GET,
                                                   .handler =
                                                       api_system_info_handler,

Provider/main/api/system/reboot.cpp

@@ -1,14 +1,13 @@
-#pragma once
-
 #include "cJSON.h"
 #include "esp_http_server.h"
 #include "esp_system.h"
 #include "esp_timer.h"
 
+#include "types.hpp"
 
-static void restart_timer_callback(void *arg) { esp_restart(); }
+internal void restart_timer_callback(void *arg) { esp_restart(); }
 
-static esp_err_t api_system_reboot_handler(httpd_req_t *req) {
+internal esp_err_t api_system_reboot_handler(httpd_req_t *req) {
   httpd_resp_set_type(req, "application/json");
 
   cJSON *root = cJSON_CreateObject();
@@ -24,18 +23,20 @@ static esp_err_t api_system_reboot_handler(httpd_req_t *req) {
       .callback = &restart_timer_callback,
       .arg = (void *)0,
       .dispatch_method = ESP_TIMER_TASK,
-      .name = "restart_timer"};
+      .name = "restart_timer",
+      .skip_unhandled_events = false};
   esp_timer_handle_t restart_timer;
   esp_timer_create(&restart_timer_args, &restart_timer);
 
-  // Schedule reboot 1 second from now to allow HTTP response to flush
+  // Schedule reboot 1 second (in microseconds) from now to allow HTTP response
-  esp_timer_start_once(restart_timer, 1000000);
+  // to flush
+  esp_timer_start_once(restart_timer, 1'000'000);
 
   return ESP_OK;
 }
 
-static const httpd_uri_t api_system_reboot_uri = {.uri = "/api/system/reboot",
+internal const httpd_uri_t api_system_reboot_uri = {
+    .uri = "/api/system/reboot",
     .method = HTTP_POST,
-                                                  .handler =
+    .handler = api_system_reboot_handler,
-                                                      api_system_reboot_handler,
     .user_ctx = NULL};

Provider/main/appstate.hpp

@@ -0,0 +1,7 @@
+#pragma once
+
+#include "types.hpp"
+
+// Shared Application State (Unity Build)
+internal bool g_Ethernet_Initialized = false;
+internal bool g_Wifi_Initialized = false;

Provider/main/http_server.cpp

@@ -0,0 +1,183 @@
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+// SDK
+#include "esp_http_server.h"
+#include "esp_log.h"
+#include "esp_vfs.h"
+
+// Project
+#include "api/system/info.cpp"
+#include "api/system/reboot.cpp"
+
+internal const char *TAG = "HTTP_SERVER";
+
+#define FILE_PATH_MAX (ESP_VFS_PATH_MAX + 128)
+#define SCRATCH_BUFSIZE 4096
+
+typedef struct {
+  char scratch[SCRATCH_BUFSIZE];
+} http_server_data_t;
+
+#ifdef CONFIG_CALENDINK_DEPLOY_WEB_PAGES
+// Set HTTP response content type according to file extension
+internal esp_err_t set_content_type_from_file(httpd_req_t *req,
+                                              const char *filepath) {
+  const char *type = "text/plain";
+  if (strstr(filepath, ".html")) {
+    type = "text/html";
+  } else if (strstr(filepath, ".js")) {
+    type = "application/javascript";
+  } else if (strstr(filepath, ".css")) {
+    type = "text/css";
+  } else if (strstr(filepath, ".png")) {
+    type = "image/png";
+  } else if (strstr(filepath, ".ico")) {
+    type = "image/x-icon";
+  } else if (strstr(filepath, ".svg")) {
+    type = "text/xml";
+  }
+  return httpd_resp_set_type(req, type);
+}
+
+// Handler to serve static files from LittleFS
+internal esp_err_t static_file_handler(httpd_req_t *req) {
+  char filepath[FILE_PATH_MAX];
+
+  // Construct real file path
+  strlcpy(filepath, "/www", sizeof(filepath));
+  if (req->uri[strlen(req->uri) - 1] == '/') {
+    strlcat(filepath, "/index.html", sizeof(filepath));
+  } else {
+    strlcat(filepath, req->uri, sizeof(filepath));
+  }
+
+  // Default to index.html if file doesn't exist (SPA routing support)
+  struct stat file_stat;
+  if (stat(filepath, &file_stat) == -1) {
+    // Try gzipped first, then fallback to index.html
+    char filepath_gz[FILE_PATH_MAX];
+    snprintf(filepath_gz, sizeof(filepath_gz), "%s.gz", filepath);
+    if (stat(filepath_gz, &file_stat) == 0) {
+      strlcpy(filepath, filepath_gz, sizeof(filepath));
+      httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
+    } else {
+      ESP_LOGW(TAG, "File not found: %s, falling back to index.html", filepath);
+      snprintf(filepath, sizeof(filepath), "%s/index.html", "/www");
+      if (stat(filepath, &file_stat) == -1) {
+        // If index.html doesn't exist, try index.html.gz
+        snprintf(filepath_gz, sizeof(filepath_gz), "%s/index.html.gz", "/www");
+        if (stat(filepath_gz, &file_stat) == 0) {
+          strlcpy(filepath, filepath_gz, sizeof(filepath));
+          httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
+        } else {
+          ESP_LOGE(TAG, "index.html not found too.");
+          httpd_resp_send_err(req, HTTPD_404_NOT_FOUND, "File not found");
+          return ESP_FAIL;
+        }
+      }
+    }
+  } else {
+    // Since ESP32 handles .gz transparently if we tell it to via headers
+    // If we requested explicitly a .gz file, set the header
+    if (strstr(filepath, ".gz")) {
+      httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
+    }
+  }
+
+  int fd = open(filepath, O_RDONLY, 0);
+  if (fd == -1) {
+    ESP_LOGE(TAG, "Failed to open file: %s", filepath);
+    httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR,
+                        "Failed to read existing file");
+    return ESP_FAIL;
+  }
+
+  set_content_type_from_file(req, filepath);
+
+  http_server_data_t *rest_context = (http_server_data_t *)req->user_ctx;
+  char *chunk = rest_context->scratch;
+  ssize_t read_bytes;
+
+  do {
+    read_bytes = read(fd, chunk, SCRATCH_BUFSIZE);
+    if (read_bytes == -1) {
+      ESP_LOGE(TAG, "Failed to read file: %s", filepath);
+    } else if (read_bytes > 0) {
+      if (httpd_resp_send_chunk(req, chunk, read_bytes) != ESP_OK) {
+        close(fd);
+        ESP_LOGE(TAG, "File sending failed!");
+        httpd_resp_sendstr_chunk(req, NULL); // Abort sending
+        return ESP_FAIL;
+      }
+    }
+  } while (read_bytes > 0);
+
+  close(fd);
+  httpd_resp_send_chunk(req, NULL, 0); // End response
+
+  return ESP_OK;
+}
+#endif
+
+// Handler for CORS Preflight OPTIONS requests
+internal esp_err_t cors_options_handler(httpd_req_t *req) {
+  httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
+  httpd_resp_set_hdr(req, "Access-Control-Allow-Methods", "GET, POST, OPTIONS");
+  httpd_resp_set_hdr(req, "Access-Control-Allow-Headers", "Content-Type");
+  httpd_resp_set_status(req, "204 No Content");
+  httpd_resp_send(req, NULL, 0);
+  return ESP_OK;
+}
+
+internal httpd_handle_t start_webserver(void) {
+  http_server_data_t *rest_context =
+      (http_server_data_t *)calloc(1, sizeof(http_server_data_t));
+  if (rest_context == NULL) {
+    ESP_LOGE(TAG, "No memory for rest context");
+    return NULL;
+  }
+
+  httpd_config_t config = HTTPD_DEFAULT_CONFIG();
+  config.uri_match_fn = httpd_uri_match_wildcard;
+  config.max_uri_handlers = 10; // We have info, reboot, options, and static
+
+  httpd_handle_t server = NULL;
+  ESP_LOGI(TAG, "Starting HTTP Server on port: '%d'", config.server_port);
+
+  if (httpd_start(&server, &config) == ESP_OK) {
+    // Register CORS OPTIONS handler for API routes
+    httpd_uri_t cors_options_uri = {.uri = "/api/*",
+                                    .method = HTTP_OPTIONS,
+                                    .handler = cors_options_handler,
+                                    .user_ctx = NULL};
+    httpd_register_uri_handler(server, &cors_options_uri);
+
+    // Register system API routes
+    httpd_register_uri_handler(server, &api_system_info_uri);
+    httpd_register_uri_handler(server, &api_system_reboot_uri);
+
+#ifdef CONFIG_CALENDINK_DEPLOY_WEB_PAGES
+    // Register static file handler last as a catch-all wildcard if deployed
+    httpd_uri_t static_get_uri = {.uri = "/*",
+                                  .method = HTTP_GET,
+                                  .handler = static_file_handler,
+                                  .user_ctx = rest_context};
+    httpd_register_uri_handler(server, &static_get_uri);
+#endif
+
+    return server;
+  }
+
+  ESP_LOGE(TAG, "Error starting server!");
+  free(rest_context);
+  return NULL;
+}
+
+internal void stop_webserver(httpd_handle_t server) {
+  if (server) {
+    httpd_stop(server);
+  }
+}

Provider/main/main.cpp

@@ -10,26 +10,32 @@
 #include "sdkconfig.h"
 #include "soc/gpio_num.h"
 
-// Project cpp
+// Project headers
-#include "connect.cpp"
+#include "appstate.hpp"
-#include "led_status.cpp"
+#include "types.hpp"
 
-// TODO : Make it configurable
+// Project cpp (Unity Build entry)
-internal constexpr bool blockUntilEthernetEstablished = false;
+// clang-format off
-internal bool ethernetInitialized = false;
+#include "connect.cpp"
-internal bool wifiInitialized = false;
+#include "http_server.cpp"
+#include "led_status.cpp"
+// clang-format on
+
+internal constexpr bool kBlockUntilEthernetEstablished = false;
 
 extern "C" void app_main() {
   printf("Hello, Worldi!\n");
 
+  httpd_handle_t web_server = NULL;
+
   ESP_ERROR_CHECK(nvs_flash_init());
   ESP_ERROR_CHECK(esp_event_loop_create_default());
 
   setup_led();
 
   set_led_status(led_status::ConnectingEthernet);
-  ethernetInitialized = true;
+  g_Ethernet_Initialized = true;
-  esp_err_t result = connect_ethernet(blockUntilEthernetEstablished);
+  esp_err_t result = connect_ethernet(kBlockUntilEthernetEstablished);
   if (result != ESP_OK) {
     set_led_status(led_status::Failed);
     vTaskDelay(pdMS_TO_TICKS(1000));
@@ -37,7 +43,7 @@ extern "C" void app_main() {
   }
 
   // Check for ethernet connection until its made
-  if (!blockUntilEthernetEstablished) {
+  if (!kBlockUntilEthernetEstablished) {
     uint8 retries = 1;
     do {
       set_led_status(led_status::ConnectingEthernet);
@@ -56,20 +62,20 @@ extern "C" void app_main() {
   if (result != ESP_OK) {
     printf("Ethernet failed, trying wifi\n");
     disconnect_ethernet();
-    ethernetInitialized = false;
+    g_Ethernet_Initialized = false;
 
     set_led_status(led_status::ConnectingWifi);
-    wifiInitialized = true;
+    g_Wifi_Initialized = true;
     result =
         connect_wifi(CONFIG_CALENDINK_WIFI_SSID, CONFIG_CALENDINK_WIFI_PASSWORD,
-                     blockUntilEthernetEstablished);
+                     kBlockUntilEthernetEstablished);
     if (result != ESP_OK) {
       set_led_status(led_status::Failed);
       vTaskDelay(pdMS_TO_TICKS(1000));
       goto shutdown;
     }
 
-    if (!blockUntilEthernetEstablished) {
+    if (!kBlockUntilEthernetEstablished) {
       uint8 retries = 1;
       do {
         set_led_status(led_status::ConnectingWifi);
@@ -98,20 +104,25 @@ extern "C" void app_main() {
   }
 
   printf("Connected!\n");
-  vTaskDelay(pdMS_TO_TICKS(5000));
 
-  // TODO Main loop
+  // Start the webserver
+  web_server = start_webserver();
 
 shutdown:
   printf("Shutting down.\n");
 
-  if (ethernetInitialized) {
+  if (web_server) {
-    disconnect_ethernet();
+    stop_webserver(web_server);
-    ethernetInitialized = false;
+    web_server = NULL;
   }
-  if (wifiInitialized) {
+
+  if (g_Ethernet_Initialized) {
+    disconnect_ethernet();
+    g_Ethernet_Initialized = false;
+  }
+  if (g_Wifi_Initialized) {
     disconnect_wifi();
-    wifiInitialized = false;
+    g_Wifi_Initialized = false;
   }
 
   destroy_led();