Sort departures by countdown

Reviewed-on: #2

.gitignore

@@ -1,3 +1,4 @@
 result
 vrnp
+main
 *.swp

client/bitmaps.h

@@ -81,3 +81,17 @@ static const uint8_t PROGMEM spinny[][8] = {
     0x00,
   },
 };
+static const uint16_t PROGMEM tiny_train_dims[] = {24, 9, 1};
+static const uint8_t PROGMEM tiny_train[][27] = {
+  {
+    0x00, 0x04, 0x00,
+    0x00, 0x02, 0x00,
+    0x01, 0xff, 0xfe,
+    0x00, 0xa4, 0x94,
+    0x01, 0x24, 0x92,
+    0x01, 0x24, 0x92,
+    0x03, 0xfc, 0xff,
+    0x03, 0xff, 0xff,
+    0x01, 0xb0, 0x36,
+  },
+};

client/client.ino

@@ -102,20 +102,17 @@ void setup() {
   
   pinMode(BUTTON_PIN, INPUT_PULLUP);
   attachInterrupt(BUTTON_PIN, onButtonFalling, FALLING);
-  /*
-  display.print(" 5 Mannheim    sofort\n"
-                "26 Kirchheim    9 min\n"
-                " 5 Weinheim     20:13");
-  */
 }
 
+#define QUERY_STRING "stop_id=de:08221:1225&platform=A"
+
 // TODO: Error handling
 String fetchDepartures() {
   std::unique_ptr<BearSSL::WiFiClientSecure> https(new BearSSL::WiFiClientSecure);
   https->setInsecure();
   
   HTTPClient client;
-  if (!client.begin(*https, "vrnp.beany.club", 443, "/departures?stop_id=de:08221:1225&platform=A")) {
+  if (!client.begin(*https, "vrnp.beany.club", 443, "/departures?" QUERY_STRING)) {
     display.fillScreen(COLOR_BG);
     display.setCursor(0, 0);
     display.print("begin failed");
@@ -179,14 +176,19 @@ void logic_loop() {
 
       int line = 0;
       for (JsonVariant departure : departures["departures"].as<JsonArray>()) {
-        const char *directionStr = departure["direction"].as<const char *>();
-
         display.setCursor(MAIN_X, MAIN_Y + (CY + 3) * line);
-        display.printf("%2s %-15.15s %6s",
+        display.printf("%2s %-15.15s ",
           departure["symbol"].as<const char*>(),
-          directionStr,
-          departure["leaving"].as<const char*>()
+          departure["direction"].as<const char *>()
         );
+        if (departure["leaving"].as<String>().equals("sofort")) {
+          int16_t x = display.getCursorX();
+          int16_t y = display.getCursorY();
+          display.drawBitmap(x + 6 * CX - tiny_train_dims[0], y, tiny_train[0], tiny_train_dims[0], tiny_train_dims[1], COLOR_TEXT);
+        } else {
+          display.printf("%6s", departure["leaving"].as<const char*>());
+        }
+
         line++;
       }
       

client/scripts/extract_bitmaps.py

@@ -43,3 +43,4 @@ def generate_bitmap_from_gif(file: Path, fd):
 
 if __name__ == "__main__":
     generate_bitmap_from_gif(Path("./animations/spinny.gif"), sys.stdout)
+    generate_bitmap_from_gif(Path("./animations/tiny_train.gif"), sys.stdout)

flake.lock

@@ -1,5 +1,23 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "gitignore": {
       "inputs": {
         "nixpkgs": [
@@ -38,9 +56,25 @@
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "gitignore": "gitignore",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -3,20 +3,20 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
     gitignore = {
       url = "github:hercules-ci/gitignore.nix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
-  outputs = { self, nixpkgs, gitignore }:
+  outputs = { self, nixpkgs, flake-utils, gitignore }: flake-utils.lib.eachDefaultSystem (system:
     let
-    system = "x86_64-linux";
-    pkgs = nixpkgs.legacyPackages.${system};
+      pkgs = import nixpkgs { inherit system; };
 
       vrnp-static = pkgs.buildGoModule {
         pname = "vrnp";
-      version = "0.0.5";
+        version = "0.0.7";
         vendorHash = null;
 
         # For building the package, we use only the files not ignored by Git as inputs.
@@ -31,15 +31,15 @@
         CGO_ENABLED = 0;
       };
     in {
-    devShell.${system} = pkgs.mkShellNoCC {
+      devShell = pkgs.mkShell {
         packages = [
           pkgs.go
           (pkgs.python3.withPackages (ps: with ps; [ pillow ]))
         ];
       };
-    packages.${system} = {
+      packages = {
         default = vrnp-static;
-      image-meta = pkgs.runCommand "vrnp-version" {} ''
+        image-meta = pkgs.runCommand "image-meta" {} ''
           mkdir -p $out
           echo -n ${vrnp-static.version} > $out/version
           echo -n git.pbrinkmeier.de/paul/vrnp:${vrnp-static.version} > $out/name
@@ -55,5 +55,6 @@
           config.Cmd = [ "${vrnp-static}/bin/vrnp" ];
         };
       };
-  };
+    }
+  );
 }

main.go

@@ -1,5 +1,6 @@
 package main
 
+import "cmp"
 import "encoding/json"
 import "errors"
 import "fmt"
@@ -8,7 +9,9 @@ import "net/http"
 import "net/url"
 import "os"
 import "slices"
+import "strings"
 import "strconv"
+import "sync/atomic"
 import "time"
 
 // JSON unmarshaling types for departure monitor API
@@ -43,11 +46,23 @@ type DMDateTime struct {
 	Minute string `json:"minute"`
 }
 
-func FetchDepartures(stopId string) (DMResponse, error) {
+type EFAClient interface {
+	GetName() string
+	BuildRequest(string) (*http.Request, error)
+}
+
+type VRNEFAClient struct {
+}
+
+func (c VRNEFAClient) GetName() string {
+	return "VRN"
+}
+
+func (c VRNEFAClient) BuildRequest(stopId string) (*http.Request, error) {
 	// Create request object
 	req, err := http.NewRequest("GET", "https://www.vrn.de/mngvrn/XML_DM_REQUEST", nil)
 	if err != nil {
-		return DMResponse{}, err
+		return nil, err
 	}
 
 	// Configure our request
@@ -65,6 +80,77 @@ func FetchDepartures(stopId string) (DMResponse, error) {
 	query.Set("useRealtime", "1")
 	req.URL.RawQuery = query.Encode()
 
+	return req, nil
+}
+
+type KVVEFAClient struct {
+}
+
+func (c KVVEFAClient) GetName() string {
+	return "KVV"
+}
+
+func (c KVVEFAClient) BuildRequest(stopId string) (*http.Request, error) {
+	form := url.Values{}
+	form.Set("action", "XSLT_DM_REQUEST")
+	form.Set("name_dm", stopId)
+	form.Set("type_dm", "stop")
+	form.Set("useRealtime", "1")
+	form.Set("limit", "10")
+	form.Set("mode", "direct")
+	form.Set("useRealtime", "1")
+	form.Set("outputFormat", "json")
+	body := strings.NewReader(form.Encode())
+
+	req, err := http.NewRequest("POST", "https://www.kvv.de/tunnelEfaDirect.php", body)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("User-Agent", "coolio/1.0")
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	return req, nil
+}
+
+type BwegtEFAClient struct {
+}
+
+func (c BwegtEFAClient) GetName() string {
+	return "bwegt"
+}
+
+func (c BwegtEFAClient) BuildRequest(stopId string) (*http.Request, error) {
+	// Create request object
+	req, err := http.NewRequest("GET", "https://www.bwegt.de/bwegt-efa/XML_DM_REQUEST", nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Configure our request
+	query := url.Values{}
+	query.Set("coordOutputFormat", "EPSG:4326")
+	query.Set("depType", "stopEvents")
+	query.Set("includeCompleteStopSeq", "0")
+	query.Set("limit", "10")
+	query.Set("locationServerActive", "0")
+	query.Set("mode", "direct")
+	query.Set("name_dm", stopId)
+	query.Set("outputFormat", "json")
+	query.Set("type_dm", "stop")
+	query.Set("useOnlyStops", "1")
+	query.Set("useRealtime", "1")
+	req.URL.RawQuery = query.Encode()
+
+	return req, nil
+}
+
+func FetchDepartures(c EFAClient, stopId string) (DMResponse, error) {
+	req, err := c.BuildRequest(stopId)
+	if err != nil {
+		return DMResponse{}, err
+	}
+
 	// Send the request, wait max 10 seconds
 	client := http.Client{
 		Timeout: 10 * time.Second,
@@ -95,6 +181,7 @@ type Departure struct {
 	Symbol    string `json:"symbol"`
 	Direction string `json:"direction"`
 	Leaving   string `json:"leaving"`
+	Countdown int
 }
 
 func ParseDepartures(response DMResponse, allowedPlatform *string) (Departures, error) {
@@ -139,9 +226,14 @@ func ParseDepartures(response DMResponse, allowedPlatform *string) (Departures,
 			d.ServingLine.Symbol,
 			direction,
 			leaving,
+			countdown,
 		})
 	}
 
+	slices.SortFunc(ds, func(a Departure, b Departure) int {
+		return cmp.Compare(a.Countdown, b.Countdown)
+	})
+
 	return Departures{ds}, nil
 }
 
@@ -151,6 +243,14 @@ func main() {
 		panic("Required environment variable VRNP_PASSWORD is not set")
 	}
 
+	// Use round-robin to send incoming requests to different servers
+	var efaClient atomic.Uint64
+	efaClients := []EFAClient{
+		BwegtEFAClient{},
+		VRNEFAClient{},
+		KVVEFAClient{},
+	}
+
 	http.HandleFunc("/departures", func(w http.ResponseWriter, r *http.Request) {
 		user, pass, ok := r.BasicAuth()
 		if !(ok && user == "admin" && pass == password) {
@@ -172,7 +272,9 @@ func main() {
 			platform = &query["platform"][0]
 		}
 
-		ds, err := FetchDepartures(stopId)
+		c := efaClients[(efaClient.Add(1) - 1) % uint64(len(efaClients))]
+		log.Print(c.GetName())
+		ds, err := FetchDepartures(c, stopId)
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return