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/
mongo.go
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/
mongo.go
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package mongo
import (
"context"
"fmt"
"github.com/CyanAsterisk/FreeCar/server/shared/consts"
"github.com/CyanAsterisk/FreeCar/server/shared/errno"
"github.com/CyanAsterisk/FreeCar/server/shared/id"
"github.com/CyanAsterisk/FreeCar/server/shared/kitex_gen/base"
mgutil "github.com/CyanAsterisk/FreeCar/server/shared/mongo"
"github.com/CyanAsterisk/FreeCar/server/shared/mongo/objid"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
const (
carField = "car"
statusField = carField + ".status"
driverField = carField + ".driver"
positionField = carField + ".position"
tripIDField = carField + ".tripid"
powerField = carField + ".power"
plateNumField = carField + ".platenum"
initLatitude = 29.5
initLongitude = 106.6
)
// CarRecord defines a car record in mongo db.
type CarRecord struct {
mgutil.IDField `bson:"inline"`
Car *base.Car `bson:"car"`
}
type Manager struct {
col *mongo.Collection
}
// NewManager creates a mongo manager.
func NewManager(db *mongo.Database) *Manager {
return &Manager{col: db.Collection(consts.CarCollection)}
}
// CreateCar creates a car.
func (m *Manager) CreateCar(c context.Context, plateNum string) (*CarRecord, error) {
cr := &CarRecord{
Car: &base.Car{
Position: &base.Position{
Latitude: initLatitude,
Longitude: initLongitude,
},
Status: base.CarStatus_LOCKED,
PlateNum: plateNum,
Power: 100,
},
}
cr.ID = mgutil.NewObjID()
_, err := m.col.InsertOne(c, cr)
if err != nil {
return nil, err
}
return cr, nil
}
// GetCar gets a car.
func (m *Manager) GetCar(c context.Context, id id.CarID) (*CarRecord, error) {
objID, err := objid.FromID(id)
if err != nil {
return nil, fmt.Errorf("invalid id: %v", err)
}
return convertSingleResult(m.col.FindOne(c, bson.M{
mgutil.IDFieldName: objID,
}))
}
// GetCars gets cars.
func (m *Manager) GetCars(c context.Context, limit int64) ([]*CarRecord, error) {
filter := bson.M{}
opt := options.Find().SetLimit(limit)
res, err := m.col.Find(c, filter, opt)
if err != nil {
return nil, err
}
var cars []*CarRecord
for res.Next(c) {
var cr CarRecord
err := res.Decode(&cr)
if err != nil {
return nil, err
}
cars = append(cars, &cr)
}
return cars, nil
}
// CarUpdate defines updates to a car.
// Only specified fields will be updated.
type CarUpdate struct {
Status base.CarStatus
Position *base.Position
Driver *base.Driver
Power float64
UpdateTripID bool
TripID id.TripID
PlateNum string
}
// UpdateCar updates a car. If status is specified,
// it updates the car only when existing record matches the
// status specified.
func (m *Manager) UpdateCar(c context.Context, id id.CarID, status base.CarStatus, update *CarUpdate) (*CarRecord, error) {
objID, err := objid.FromID(id)
if err != nil {
return nil, fmt.Errorf("invalid id: %v", err)
}
filter := bson.M{
mgutil.IDFieldName: objID,
}
if status != base.CarStatus_CS_NOT_SPECIFIED {
filter[statusField] = status
}
u := bson.M{}
if update.Status != base.CarStatus_CS_NOT_SPECIFIED {
u[statusField] = update.Status
}
if update.Driver != nil {
u[driverField] = update.Driver
}
if update.Position != nil {
u[positionField] = update.Position
}
if update.UpdateTripID {
u[tripIDField] = update.TripID.String()
}
if update.Power > 0 {
u[powerField] = update.Power
}
if update.PlateNum != "" {
u[plateNumField] = update.PlateNum
}
res := m.col.FindOneAndUpdate(c, filter, mgutil.Set(u),
options.FindOneAndUpdate().SetReturnDocument(options.After))
return convertSingleResult(res)
}
func (m *Manager) DeleteCar(c context.Context, id id.CarID) error {
objID, err := objid.FromID(id)
if err != nil {
return err
}
filter := bson.M{
mgutil.IDFieldName: objID,
}
result, err := m.col.DeleteOne(c, filter)
if err != nil {
return err
}
if result.DeletedCount == 0 {
return errno.RecordNotFound
}
return nil
}
func convertSingleResult(res *mongo.SingleResult) (*CarRecord, error) {
if err := res.Err(); err != nil {
return nil, err
}
var cr CarRecord
err := res.Decode(&cr)
if err != nil {
return nil, fmt.Errorf("cannot decode: %v", err)
}
return &cr, nil
}