Initial cloud-services repo - gateway service + pkg modules

pkg/cache/verify.go

@@ -0,0 +1,58 @@
+package cache
+
+import (
+	"fiskerinc.com/modules/common"
+	"fiskerinc.com/modules/db/queries"
+	"fiskerinc.com/modules/logger"
+	"fiskerinc.com/modules/redis"
+
+	redigo "github.com/gomodule/redigo/redis"
+	"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.ClientPoolInterface, 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(clientPool redis.ClientPoolInterface, key string) (bool, error) {
+	client := clientPool.GetFromPool()
+	defer client.Close()
+	ok, err := redigo.Bool(client.Execute("GET", key))
+	if err != nil && !errors.Is(err, redigo.ErrNil) {
+		logger.Warn().Err(err).Send()
+		return ok, err
+	}
+	return ok, nil
+}
+
+func redisPlaceDriverCache(clientPool redis.ClientPoolInterface, key string, verified bool) (err error) {
+	client := clientPool.GetFromPool()
+	defer client.Close()
+	batch := redis.NewRedisBatchCommands()
+	batch.Add("SET", key, verified)
+	batch.Add("EXPIRE", key, redisObjectExpire)
+	_, err = client.ExecuteBatch(batch)
+	return
+}