Initial cloud-services repo - gateway service + pkg modules

pkg/cachev2/verify.go

@@ -0,0 +1,60 @@
+package cachev2
+
+import (
+	"fmt"
+
+	"fiskerinc.com/modules/common"
+	"fiskerinc.com/modules/db/queries"
+	redis "fiskerinc.com/modules/redisv2"
+
+	"github.com/pkg/errors"
+)
+
+// VerifyCarToDriver checks cache and DB for car to driver relationship.
+// If relationship exists and not in cache, will cache value.
+//
+//	car:<VIN>:driver:<DRIVER_ID>
+func VerifyCarToDriver(clientPool redis.ClientInterface, db queries.CarsInterface, vin string, driverID string) (bool, error) {
+	key := redis.CarToDriverKey(vin, driverID)
+
+	ok, err := redisCheckGet(clientPool, key)
+	if err != nil {
+		return ok, err
+	}
+
+	if ok {
+		return ok, err
+	}
+
+	carToDrivers, err := db.SelectCarToDriver(&common.CarToDriver{VIN: vin, DriverID: driverID})
+	if err != nil {
+		return false, err
+	}
+	verified := len(carToDrivers) == 1
+	redisPlaceDriverCache(clientPool, key, verified)
+
+	return verified, err
+}
+
+func redisCheckGet(redisClient redis.ClientInterface, key string) (bool, error) {
+	value, err := redisClient.Get(key)
+	if err != nil {
+		if errors.Is(err, redis.ErrNil) {
+			err = nil
+		}
+		return false, err
+	}
+	v, ok := value.(bool)
+	if !ok {
+		err = fmt.Errorf("failed to convert %v interface to bool", value)
+	}
+	return v, err
+}
+
+func redisPlaceDriverCache(redisClient redis.ClientInterface, key string, verified bool) (err error) {
+	batch := redis.NewRedisBatchCommands()
+	batch.Add(redis.Command{Command: "SET", Arguments: []interface{}{key, verified}})
+	batch.Add(redis.Command{Command: "EXPIRE", Arguments: []interface{}{key, redisObjectExpire.Seconds()}})
+	_, err = redisClient.ExecuteBatch(batch)
+	return
+}