feat(agb02): api implementation

machines/agb02/agb/agb.cpp

@@ -1,12 +1,18 @@
 #include <curlpp/cURLpp.hpp>
+#include <curlpp/Easy.hpp>
+#include <curlpp/Options.hpp>
 #include <gpiod.hpp>
 #include <iostream>
+#include <fstream>
 #include <thread>
 
 using namespace std::literals::chrono_literals;
 
 constexpr std::chrono::microseconds debounce = 40ms;
 constexpr std::chrono::microseconds poll_period = 5ms;
+constexpr std::chrono::microseconds server_ratelimit = 50ms;
+
+constexpr const char* url = "https://agb.hackens.org/api/control-box";
 
 constexpr std::pair<double, double> joystick_movement(1.0, 1.0);
 
@@ -40,8 +46,10 @@ inline void clamp_decoder(uint8_t& decoder, int move){
 }
 
 int main(const int argc, char const* const* const argv) {
-  if(argc < 2)
+  if(argc < 3) {
+    std::cerr << "usage: agb gpiodevice tokenfile" << std::endl;
     return 1;
+  }
 
   /// init gpio chip ///
 
@@ -69,8 +77,16 @@ int main(const int argc, char const* const* const argv) {
   /// init server communication ///
 
   cURLpp::initialize();
+  std::string token;
+  {
+    std::ifstream tokenFile(argv[2]);
+    std::getline(tokenFile, token);
+  }
+  std::list<std::string> header;
+  header.push_back("Content-Type: application/json");
+  header.push_back("Authorization: Bearer " + token);
 
-  /// internal state ///
+  /// internal state and buffers ///
 
   gpiod::line::values joystick_read(4);
   std::pair<double, double> spot_pos(0.0, 0.0); //TODO: init from server
@@ -81,8 +97,9 @@ int main(const int argc, char const* const* const argv) {
   bool white_pressed = false;
   bool black_pressed = false;
 
-
+  bool has_changed = false;
-
+  std::chrono::time_point last_send = std::chrono::system_clock::now();
+  std::string postData;
 
   for(;;){
     std::this_thread::sleep_for(poll_period);
@@ -97,32 +114,30 @@ int main(const int argc, char const* const* const argv) {
 
     if (bool(joystick_read[0]) || bool(joystick_read[1])
         || bool(joystick_read[2]) || bool(joystick_read[3]))
-      ; //TODO: send to server
+      has_changed = true;
 
     /// Buttons ///
     bool pressed = bool(line_reader.get_value(black_button));
     if(pressed ^ black_pressed)
-      ; //TODO: send to server
+      has_changed = true;
     black_pressed = pressed;
 
     pressed = bool(line_reader.get_value(white_button));
     if(pressed ^ white_pressed)
-      ; //TODO: send to server
+      has_changed = true;
     white_pressed = pressed;
 
     /// decoder ///
     uint8_t new_realpos = read_decoder_realpos(line_reader);
     uint8_t seen_travel = std::abs(int(new_realpos) - int(decoder_realpos));
 
-    //TODO: check CW and CCW
+    // CCW
-
-    // CW
     if(seen_travel < 50 && new_realpos < decoder_realpos)
       clamp_decoder(decoder_pos, -seen_travel);
     if(seen_travel >= 50 && new_realpos > decoder_realpos)
       clamp_decoder(decoder_pos, seen_travel - 128);
 
-    // CCW
+    // CW
     if(seen_travel < 50 && new_realpos > decoder_realpos)
       clamp_decoder(decoder_pos, seen_travel);
     if(seen_travel >= 50 && new_realpos < decoder_realpos)
@@ -130,6 +145,38 @@ int main(const int argc, char const* const* const argv) {
 
     decoder_realpos = new_realpos;
     if(seen_travel)
-      ; //TODO: send to server
+      has_changed = true;
+
+    /// server notification
+    std::chrono::time_point now = std::chrono::system_clock::now();
+    if(has_changed && (now - last_send > server_ratelimit)){
+      curlpp::Easy request;
+      request.setOpt(curlpp::options::Url(url));
+      request.setOpt(curlpp::options::HttpHeader(header));
+
+      postData.clear();
+      std::format_to(std::back_inserter(postData), "{{"
+          "\"pan\": {},"
+          "\"tilt\": {},"
+          "\"focus\": {},"
+          "\"whiteButton\": {},"
+          "\"blackButton\": {}"
+        "}}",
+        spot_pos.first,
+        spot_pos.second,
+        int(decoder_pos),
+        white_pressed,
+        black_pressed
+      );
+      request.setOpt(curlpp::options::PostFields(postData));
+      request.setOpt(curlpp::options::PostFieldSize(postData.size()));
+
+      //request.perform();
+//      std::cout << std::chrono::system_clock::now() - now << std::endl;
+      std::cout << postData << std::endl;
+
+      has_changed = false;
+      last_send = now;
+    }
   }
 }

machines/agb02/secrets/default.nix

@@ -8,4 +8,8 @@
     file = ./wg.age;
     owner = "systemd-network";
   };
+  age.secrets."token" = {
+    file = ./token.age;
+    # owner = "systemd-network";
+  };
 }

machines/agb02/secrets/secrets.nix

@@ -5,4 +5,5 @@ let
       (builtins.readFile (../../../pubkeys + "/${user}.keys")));
 in {
   "wg.age".publicKeys = (readPubkeys "catvayor") ++ (readPubkeys "sinavir") ++ (readPubkeys "agb02");
+  "token.age".publicKeys = (readPubkeys "catvayor") ++ (readPubkeys "sinavir") ++ (readPubkeys "agb02");
 }