Update: 2026-07-04 17:02:24

docs/redis_state_plan.md

@@ -0,0 +1,46 @@
+# Redis State Cache Plan
+
+## New Redis Keys
+- `ride:{id}:state` (Hash) → status, driver_id, passenger_id, carType, updated_at
+- `ride:{id}:driver` (Hash) → driver_name, car_model, car_plate, rating, phone (cached)
+
+## Changes Per File
+
+### acceptRide.php
+After MySQL lock succeeds:
+```php
+$redis->hmset("ride:$rideId:state", [
+    'status'      => $status,
+    'driver_id'   => $driverId,
+    'passenger_id'=> $passengerIdValue,
+    'carType'     => $carType,
+    'updated_at'  => time()
+]);
+$redis->expire("ride:$rideId:state", 86400);
+
+$redis->hmset("ride:$rideId:driver", $driverInfo);
+$redis->expire("ride:$rideId:driver", 86400);
+
+$redis->publish("ride:state_changes", json_encode([
+    'ride_id' => $rideId, 'status' => 'accepted',
+    'driver_id' => $driverId, 'passenger_id' => $passengerIdValue
+]));
+```
+
+### start_ride.php
+```php
+$redis->hmset("ride:$rideId:state", ['status' => 'Begin', 'updated_at' => time()]);
+$con_ride->prepare("UPDATE ride SET status = ?, rideTimeStart = NOW() WHERE id = ?")->execute([$status, $ride_id]);
+$redis->publish("ride:state_changes", [...]);
+```
+
+### arrive_ride.php, cancel_ride_*.php
+Same pattern: Redis update first (or after), then MySQL, then Pub/Sub.
+
+### finish_ride_updates.php
+No change to Redis state (keep MySQL transaction as-is).
+
+## Socket Server Changes (loction_server/driver_socket.php)
+- Subscribe to Redis `ride:state_changes` channel
+- On message: update in-memory state, emit to passenger room
+- Read from `ride:{id}:state` hash instead of MySQL queries