client: Set up for multiple types of events to go into the queue

[tattlekey] / client / tattlekey.c

diff --git a/client/tattlekey.c b/client/tattlekey.c
index 6313424dc34d11143f87a107d765ba765ef02075..aadf49dd9b58d1ad36c175128583d648c4a136c8 100644 (file)
--- a/client/tattlekey.c
+++ b/client/tattlekey.c
@@ -7,6 +7,16 @@
 #include "config.h"
 #include "net.h"
 
+enum event_type { BUTTONPRESS };
+typedef struct {
+  enum event_type type;
+  union {
+    struct {
+      uint32_t timestamp;
+    } buttonpress;
+  };
+} event_t;
+
 queue_t queue;
 
 uint32_t time_s() { return time_us_64() / 1000000ul; }
@@ -18,9 +28,12 @@ static void button_pressed() {
   uint32_t time_since_last_press = now - last_button_press_time;
   if (time_since_last_press >= config_minimum_seconds_between_button_presses) {
     last_button_press_time = now;
+    event_t e;
+    e.type = BUTTONPRESS;
+    e.buttonpress.timestamp = now;
     /* We don't check for failure (full queue) here because there's not much to
      * be done about it. */
-    queue_try_add(&queue, &now);
+    queue_try_add(&queue, &e);
   }
 }
 
@@ -35,21 +48,27 @@ int main() {
     signal_error_by_blinking();
   signal(2, 300);
 
-  queue_init(&queue, sizeof(uint32_t), 99);
+  queue_init(&queue, sizeof(event_t), 99);
 
   begin_listening_for_button_press(button_pressed);
 
   u16_t seq = 0;
   while (1) {
-    uint32_t t;
-    queue_remove_blocking(&queue, &t);
-    seq++;
-    for (int i = 0; i < config_resend_count; i++) {
-      uint32_t now = time_s();
-      uint32_t ago = now - t;
-      send_report(seq, ago);
-      signal(i == 0 ? 2 : 1, 100);
-      sleep_ms(config_resend_interval_ms);
+    event_t e;
+    queue_remove_blocking(&queue, &e);
+    switch (e.type) {
+    case BUTTONPRESS:
+      seq++;
+      for (int i = 0; i < config_resend_count; i++) {
+        uint32_t now = time_s();
+        uint32_t ago = now - e.buttonpress.timestamp;
+        send_report(seq, ago);
+        signal(i == 0 ? 2 : 1, 100);
+        sleep_ms(config_resend_interval_ms);
+      }
+      break;
+    default:
+      signal_error_by_blinking();
     }
   }
 }