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repository.go
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repository.go
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package mongo
import (
"context"
"errors"
pkgErrors "github.com/go-park-mail-ru/2023_1_PracticalDev/internal/pkg/errors"
short "github.com/go-park-mail-ru/2023_1_PracticalDev/internal/shortener"
gen "github.com/go-park-mail-ru/2023_1_PracticalDev/pkg/shortener"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.uber.org/zap"
)
type shortener struct {
db *mongo.Database
log *zap.Logger
}
type shortURL struct {
OriginalURL string `bson:"original_url"`
ShortCode string `bson:"short_code"`
}
var (
ErrGenerateAttemptsLimitExceeded = errors.New("generate attempts limit exceeded")
)
func NewShortenerRepository(db *mongo.Database, log *zap.Logger) short.ShortenerRepository {
return &shortener{
db: db,
log: log,
}
}
func (s *shortener) Get(hash string) (string, error) {
res := &shortURL{}
collection := s.db.Collection("urls")
err := collection.FindOne(context.Background(), bson.M{"short_code": hash}).Decode(res)
if err == mongo.ErrNoDocuments {
s.log.Error("failed to find short link", zap.String("ShortCode", hash), zap.Error(err))
return "", pkgErrors.ErrLinkNotFound
}
s.log.Debug("found short link", zap.String("OriginalURL", res.OriginalURL), zap.String("ShortCode", hash))
return res.OriginalURL, nil
}
func (s *shortener) Create(url string) (string, error) {
collection := s.db.Collection("urls")
res := &shortURL{}
err := collection.FindOne(context.Background(), bson.M{"original_url": url}).Decode(res)
if err == nil {
s.log.Debug("short link already exists", zap.String("OriginalURL", url), zap.String("ShortCode", res.ShortCode))
return res.ShortCode, nil
}
count := 10
for count > 0 {
sc := gen.GenerateShortCode()
err := collection.FindOne(context.Background(), bson.M{"short_code": sc}).Decode(res)
if err == mongo.ErrNoDocuments {
_, err := collection.InsertOne(context.Background(), &shortURL{
OriginalURL: url,
ShortCode: sc,
})
if err != nil {
s.log.Error("failed to insert short link", zap.String("OriginalURL", url), zap.Error(err))
return "", err
}
s.log.Debug("generated short link", zap.String("OriginalURL", url), zap.String("ShortCode", sc))
return sc, nil
}
if err != nil {
s.log.Error("failed to lookup short link", zap.String("OriginalURL", url), zap.Error(err))
}
count--
}
s.log.Error("generate attempts limit exceeded")
return "", ErrGenerateAttemptsLimitExceeded
}