Siro/docs/redis_state_plan.md

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:

$redis->hmset("ride:$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

$redis->hmset("ride:$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