Add home assistant bare bones panel

src/config.cpp

@@ -10,10 +10,12 @@
 // A list of all panels to be displayed, in order
 dashboard::panel::panel* PANELS[] = {
     //new dashboard::panel::sample_panel(),
+    new dashboard::panel::homeassistant(),
     new dashboard::panel::plex(),
     new dashboard::panel::weather(),
     new dashboard::panel::wifi(),
 };
+
 size_t PANELS_LENGTH = sizeof(PANELS)/sizeof(PANELS[0]);
 
 // OVERLAY
@@ -49,7 +51,8 @@ const char* IMAGE_LOCATIONS[] = {
 
     //plex
     "plex_background.jpg",
-    
+
+    //homeassistant
 };
 size_t IMAGE_LOCATIONS_LENGTH = sizeof(IMAGE_LOCATIONS)/sizeof(IMAGE_LOCATIONS[0]);
 
@@ -76,6 +79,7 @@ const FONT_SIZE_STRING CONST_STRINGS[] = {
     { "Weather", { "Roboto_Mono/RobotoMono-Medium.ttf", 50 } },
     { "Wireless", { "Roboto_Mono/RobotoMono-Medium.ttf", 50 } },
     { "Plex", { "Roboto_Mono/RobotoMono-Medium.ttf", 50} },
+    { "Homeassistant", { "Roboto_Mono/RobotoMono-Medium.ttf", 50} },
     //sample panel
     //{ "Sample Panel", { "Roboto_Mono/RobotoMono-Medium.ttf", 50} },
 
@@ -101,5 +105,7 @@ const FONT_SIZE_STRING CONST_STRINGS[] = {
     { "Playing", {"Roboto_Mono/RobotoMono-Medium.ttf", 28} },
     { "Top Users", {"Roboto_Mono/RobotoMono-Medium.ttf", 50} },
 
+    //Home assistant
+    { "Home", {"Roboto_Mono/RobotoMono-Medium.ttf", 50} },
 };
 size_t CONST_STRINGS_LENGTH = sizeof(CONST_STRINGS)/sizeof(CONST_STRINGS[0]);

src/config.def.hpp

@@ -79,6 +79,7 @@ constexpr int IMG_FLAGS = 0
 #include "panel/def_overlay.hpp"
 #include "panel/wifi.hpp"
 #include "panel/plex.hpp"
+#include "panel/homeassistant.hpp"
 //uncomment this to use the sample panel
 //#include "panel/sample_panel.hpp"
 extern dashboard::panel::panel* PANELS[];

src/panel/homeassistant.cpp

@@ -0,0 +1,225 @@
+///////////////////////////////////////////////////////////////////////////////
+// Tyler Perkins
+// 14-1-22
+// homeassistant panel
+//
+
+#include "homeassistant.hpp"
+#include "homeassistant_config.hpp"
+
+using namespace dashboard::panel;
+
+///////////////////////////////////////////////////////////////////////////////
+// Constructors ///////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+
+homeassistant::homeassistant(){
+    std::cerr << "HOMEASSISTANT CONSTRUCTOR\n";
+    _time_on_screen = HOMEASSISTANT_DEFAULT_ON_SCREEN_TIME;
+    _update_interval = std::chrono::milliseconds{HOMEASSISTANT_UPDATE_INTERVAL};
+    _texture = nullptr;
+    _title = HOMEASSISTANT_TITLE;
+
+    std::string api_string = "Authorization: Bearer ";
+    api_string += HOMEASSISTANT_APIKEY;
+
+    headers = NULL;
+    headers = curl_slist_append(headers, api_string.c_str());
+    headers = curl_slist_append(headers, "Content-Type: application/json");
+
+    api_string.clear();
+
+    api_curl = curl_easy_init();
+    curl_easy_setopt(api_curl, CURLOPT_HTTPHEADER, headers);
+    curl_easy_setopt(api_curl, CURLOPT_URL, HOMEASSISTANT_URL);
+    curl_easy_setopt(api_curl, CURLOPT_WRITEFUNCTION,
+            dashboard::panel::homeassistant::curl_callback);
+    curl_easy_setopt(api_curl, CURLOPT_WRITEDATA, &json_string);
+    //Write request string in update function
+}
+
+homeassistant::~homeassistant(){
+    std::cerr << "HOMEASSISTANT DECONSTRUCTOR\n";
+    if(_texture != nullptr){
+        SDL_DestroyTexture(_texture);
+    }
+    if(api_curl != nullptr){
+        curl_easy_cleanup(api_curl);
+    }
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Draw function //////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+
+void homeassistant::draw(){
+    //create the texture if this is the first time running draw
+    if(_texture == nullptr){
+        initTexture();
+        update();
+        update_texture();
+    }
+
+    //check if its time to update
+    if((std::chrono::high_resolution_clock::now() - _last_update) 
+            > _update_interval){
+        update();
+
+        update_texture();
+    }
+
+    SDL_RenderCopy(board::getRenderer(), _texture, NULL, NULL);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Helper functions ///////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////
+// Update the information of the obj
+// This DOES NOT update the display
+void homeassistant::update(){
+    std::cerr << "HOMEASSISTANT::UPDATE\n";
+    _last_update = std::chrono::high_resolution_clock::now();
+
+    //perform request
+    curl_easy_perform(api_curl);
+
+    std::cerr << json_string << "\n";
+
+    //parse the result
+    json_doc.Parse(json_string.c_str());
+
+    //update internal state
+    for(rapidjson::SizeType i = 0; i < json_doc.Size(); i++){
+
+        //if is a person entry
+        if(strstr(json_doc[i]["entity_id"].GetString(), "person.") != NULL){
+            //get the last changed date and convert to a tm
+            std::string format_str = json_doc[i]["last_changed"].GetString();
+            std::time_t t = datestringToTm(format_str);
+            std::stringstream ss;
+            ss << std::put_time(std::localtime(&t), "%b %e, %I:%M %p");
+
+            struct home_entry entry = {
+                json_doc[i]["attributes"]["friendly_name"].GetString(),
+                strcmp(json_doc[i]["state"].GetString(), "home") == 0 ? true : false,
+                ss.str(),
+            };
+
+            home_entries.push_back(entry);
+        }
+
+        //TODO other entries from general home assistant?
+
+
+
+    }
+    json_string.clear();
+}
+
+///////////////////////////////////////
+// Update the texture that is being
+// displayed, based on data grabed from json
+void homeassistant::update_texture(){
+    std::cerr << "HOMEASSISTANT::UPDATE_TEXTURE\n";
+
+    SDL_Rect tgt;
+
+    SDL_SetRenderTarget(board::getRenderer(), _texture);
+    SDL_RenderClear(board::getRenderer());
+
+    constexpr int GAP_SIZE = 10;
+
+    //draw each name and time last seen
+    {
+        for(size_t i = 0; i < home_entries.size(); ++i){
+            tgt.x = (SCREEN_WIDTH / (2 * home_entries.size()))
+                + i * (SCREEN_WIDTH / home_entries.size());
+            tgt.y = DEF_OVERLAY_BAR_HEIGHT + GAP_SIZE;
+            TTF_SizeText(board::getFont( {"Roboto_Mono/RobotoMono-Medium.ttf", 50} ),
+                    home_entries[i].name.c_str(),
+                    &tgt.w, &tgt.h);
+
+            tgt.x -= tgt.w / 2;
+
+            SDL_RenderCopy(board::getRenderer(),
+                    board::getString(home_entries[i].name,
+                    { "Roboto_Mono/RobotoMono-Medium.ttf", 50 }),
+                NULL, &tgt);
+
+            //down a new line
+            tgt.y += tgt.h + GAP_SIZE;
+            tgt.x += tgt.w / 2;
+
+            std::string home = "";
+
+            //if is home
+            if(home_entries[i].home){
+                home = "Home";
+            } else {
+                home = home_entries[i].time;
+            }
+
+            TTF_SizeText(board::getFont( {"Roboto_Mono/RobotoMono-Medium.ttf", 50} ),
+                home.c_str(),
+                &tgt.w, &tgt.h);
+
+            tgt.x -= tgt.w / 2;
+
+            SDL_RenderCopy(board::getRenderer(),
+                    board::getString(home,
+                    { "Roboto_Mono/RobotoMono-Medium.ttf", 50 }),
+                    NULL, &tgt);
+        }
+    }
+
+
+    home_entries.clear();
+    SDL_SetRenderTarget(board::getRenderer(), NULL);
+}
+
+///////////////////////////////////////
+// Lazy load the texture object
+// This is to make sure that all of SDL
+// is init before we attempt to draw anything
+void homeassistant::initTexture(){
+    if(_texture == nullptr){
+        _texture = SDL_CreateTexture(board::getRenderer(),
+                SDL_PIXELFORMAT_RGBA8888,
+                SDL_TEXTUREACCESS_TARGET,
+                SCREEN_WIDTH, SCREEN_HEIGHT);
+
+        SDL_SetTextureBlendMode(_texture, SDL_BLENDMODE_BLEND);
+    }
+}
+
+///////////////////////////////////////
+// Convert the homeassistant string
+// format to a tm object
+std::time_t homeassistant::datestringToTm(const std::string& date_string){
+    int year = 0, month = 0, day = 0, hour = 0, minuite = 0, second = 0;
+
+    std::tm tm_tmp{};
+
+    if(sscanf(date_string.c_str(), "%4d-%2d-%2dT%2d:%2d:%2d",
+                &year, &month, &day, &hour, &minuite, &second) == 6){
+        tm_tmp.tm_year = year - 1900;
+        tm_tmp.tm_mon = month - 1;
+        tm_tmp.tm_mday = day;
+        tm_tmp.tm_hour = hour;
+        tm_tmp.tm_min = minuite;
+        tm_tmp.tm_sec = second;
+    }
+
+    return std::mktime(&tm_tmp);
+}
+
+///////////////////////////////////////
+// Curl callback function
+size_t dashboard::panel::homeassistant::curl_callback(void* contents, size_t size,
+        size_t nmemb, void* userp){
+    ((std::string*)userp)->append((char*)contents, size * nmemb);
+    return size * nmemb;
+}

src/panel/homeassistant.hpp

@@ -0,0 +1,59 @@
+///////////////////////////////////////////////////////////////////////////////
+// Tyler Perkins
+// 14-1-22
+// Home assistant panel
+//
+
+#pragma once
+
+#include "panel.hpp"
+
+#include <SDL.h>
+#include <SDL2/SDL_image.h>
+#include <SDL2/SDL_ttf.h>
+
+#include <curl/curl.h>
+#include "../util/rapidjson/document.h"
+
+#include <iostream>
+#include <string>
+#include <string.h>
+#include <chrono>
+#include <vector>
+#include <iomanip>
+
+namespace dashboard::panel {
+    class homeassistant : public panel {
+    public:
+        homeassistant();
+        ~homeassistant();
+
+        static size_t curl_callback(void*, size_t, size_t, void*);
+
+        void draw();
+    private:
+        void update();
+        void update_texture();
+        void initTexture();
+
+        std::time_t datestringToTm(const std::string&);
+
+        struct home_entry {
+            std::string name;
+            bool home;
+            std::string time;
+        };
+
+        std::vector<home_entry> home_entries;
+
+        CURL* api_curl;
+        struct curl_slist *headers;
+        std::string json_string;
+        rapidjson::Document json_doc;
+
+        std::chrono::time_point<std::chrono::high_resolution_clock> _last_update;
+        std::chrono::milliseconds _update_interval;
+    };
+}
+
+#include "../board.hpp"

src/panel/homeassistant_config.hpp

@@ -0,0 +1,31 @@
+///////////////////////////////////////////////////////////////////////////////
+// Tyler Perkins
+// 14-1-22
+// homeassistant configuration
+//
+
+#pragma once
+
+#include "def_overlay_config.hpp"
+
+namespace dashboard::panel {
+    //This will be displayed at the top left on the status bar. Set to a blank
+    //string to not show anything
+    constexpr char HOMEASSISTANT_TITLE[] = "Home assistant";
+
+    //API key, you can get this in homeassistant under your profile
+    constexpr char HOMEASSISTANT_APIKEY[] = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiIxYTNhNDhhYTBlZDM0MjkyOTk5OWZhNGVjZGRjMGUwMCIsImlhdCI6MTY0MjE4NDU0MCwiZXhwIjoxOTU3NTQ0NTQwfQ.Zdy7-ZwX0HuwhmUGeLhF5XCluotsKmpDqmi5o-hQZCc";
+
+    //This API endpoint. Sub the IP with the IP of the homeassistant server on
+    //your network. Be sure to enable the RESTful API in homeassistant's
+    //configuration.yaml
+    constexpr char HOMEASSISTANT_URL[] = "http://192.168.1.104:8123/api/states";
+
+    //Default time the slide is shown on screen, in ms
+    //Default 15s
+    constexpr size_t HOMEASSISTANT_DEFAULT_ON_SCREEN_TIME = 15000;
+
+    //How long should we wait between updates? in ms
+    //Default 15
+    constexpr size_t HOMEASSISTANT_UPDATE_INTERVAL = 15000;
+}