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#include "http_api.h"
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include "cJSON.h"
#include "esp_check.h"
#include "esp_heap_caps.h"
#include "esp_http_server.h"
#include "esp_log.h"
#include "esp_timer.h"
#include "net_eth.h"
#include "viewport_state.h"
static const char *TAG = "http_api";
static const char *state_name(viewport_run_state_t s)
{
switch (s) {
case VIEWPORT_STATE_AWAKE: return "awake";
case VIEWPORT_STATE_ASLEEP: return "asleep";
default: return "unconfigured";
}
}
static esp_err_t state_get_handler(httpd_req_t *req)
{
viewport_state_lock();
viewport_state_t *st = viewport_state_get();
uint64_t now_us = (uint64_t)esp_timer_get_time();
uint64_t up_ms = (now_us - st->boot_us) / 1000;
int64_t last_age_ms = (st->last_frame_us < 0)
? -1
: (int64_t)((now_us - (uint64_t)st->last_frame_us) / 1000);
cJSON *root = cJSON_CreateObject();
cJSON_AddItemToObject(root, "name",
st->viewport_name[0] ? cJSON_CreateString(st->viewport_name)
: cJSON_CreateNull());
cJSON_AddStringToObject(root, "version", VIEWPORT_VERSION);
cJSON_AddBoolToObject(root, "configured", st->configured);
cJSON_AddStringToObject(root, "state", state_name(st->state));
cJSON_AddNumberToObject(root, "uptime_ms", (double)up_ms);
cJSON_AddItemToObject(root, "last_frame_ms_ago",
last_age_ms < 0 ? cJSON_CreateNull()
: cJSON_CreateNumber((double)last_age_ms));
cJSON_AddNumberToObject(root, "frames_received", (double)st->frames_received);
cJSON_AddNumberToObject(root, "decode_errors", (double)st->decode_errors);
cJSON_AddNumberToObject(root, "state_post_failures", (double)st->state_post_failures);
cJSON_AddStringToObject(root, "resolution", viewport_state_resolution_str());
cJSON_AddStringToObject(root, "ip", net_eth_get_ip_str());
cJSON_AddNumberToObject(root, "free_heap",
(double)heap_caps_get_free_size(MALLOC_CAP_INTERNAL));
cJSON_AddNumberToObject(root, "free_psram",
(double)heap_caps_get_free_size(MALLOC_CAP_SPIRAM));
viewport_state_unlock();
char *body = cJSON_PrintUnformatted(root);
cJSON_Delete(root);
if (!body) return ESP_ERR_NO_MEM;
httpd_resp_set_type(req, "application/json");
esp_err_t err = httpd_resp_send(req, body, HTTPD_RESP_USE_STRLEN);
cJSON_free(body);
return err;
}
static const httpd_uri_t s_state_get = {
.uri = "/state",
.method = HTTP_GET,
.handler = state_get_handler,
.user_ctx = NULL,
};
esp_err_t http_api_start(void)
{
httpd_config_t cfg = HTTPD_DEFAULT_CONFIG();
cfg.server_port = 80;
cfg.max_uri_handlers = 8;
cfg.lru_purge_enable = true;
httpd_handle_t server = NULL;
ESP_RETURN_ON_ERROR(httpd_start(&server, &cfg), TAG, "httpd_start");
ESP_RETURN_ON_ERROR(httpd_register_uri_handler(server, &s_state_get),
TAG, "register /state");
ESP_LOGI(TAG, "http server listening on :80 (GET /state)");
return ESP_OK;
}
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