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file.go
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file.go
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package usecases
import (
"encoding/csv"
"fmt"
"io"
"log"
"mime/multipart"
"os"
"regexp"
"strconv"
"time"
acEntity "github.com/braejan/go-transactions-summary/internal/domain/account/entity"
acUsecases "github.com/braejan/go-transactions-summary/internal/domain/account/usecases"
fileEntity "github.com/braejan/go-transactions-summary/internal/domain/file/entity"
txEntity "github.com/braejan/go-transactions-summary/internal/domain/transaction/entity"
txUsecases "github.com/braejan/go-transactions-summary/internal/domain/transaction/usecases"
txUtil "github.com/braejan/go-transactions-summary/internal/domain/transaction/util"
userUsecases "github.com/braejan/go-transactions-summary/internal/domain/user/usecases"
voAccount "github.com/braejan/go-transactions-summary/internal/valueobject/account"
voFile "github.com/braejan/go-transactions-summary/internal/valueobject/file"
voTransaction "github.com/braejan/go-transactions-summary/internal/valueobject/transaction"
voUser "github.com/braejan/go-transactions-summary/internal/valueobject/user"
)
// localFileUseCases struct implements the FileUseCases interface.
type localFileUseCases struct {
userUseCases userUsecases.UserUseCases
accountUseCases acUsecases.AccountUseCases
transactionUseCases txUsecases.TransactionUseCases
}
// NewFileUseCases returns a new localFileUseCases instance.
func NewFileUseCases(
userUseCases userUsecases.UserUseCases,
accountUseCases acUsecases.AccountUseCases,
transactionUseCases txUsecases.TransactionUseCases,
) (useCases FileUseCases, err error) {
if userUseCases == nil {
err = voUser.ErrNilUserUseCases
return
}
if accountUseCases == nil {
err = voAccount.ErrNilAccountUseCases
return
}
if transactionUseCases == nil {
err = voTransaction.ErrNilTransactionUseCases
return
}
useCases = &localFileUseCases{
userUseCases: userUseCases,
accountUseCases: accountUseCases,
transactionUseCases: transactionUseCases,
}
return
}
// ReadFile reads the file from the given path.
func (useCases *localFileUseCases) ReadAndProcessFile(file fileEntity.TxFile, isS3 bool) (err error) {
err = useCases.CheckFile(file, isS3)
if err != nil {
return
}
// Open the file. Omit validation previously done.
osFile, _ := useCases.openOSFile(file.Path)
defer osFile.Close()
// Create a new reader.
reader := csv.NewReader(osFile)
// Read the file registers.
txsAux, err := useCases.readFileRegisters(reader, file.Name)
if err != nil {
return
}
txs := txUtil.ArrayTxMemoryToArrayValue(txsAux)
err = useCases.createTransactions(txs)
return
}
// CheckFile checks if is a valid structured file.
func (useCases *localFileUseCases) CheckFile(file fileEntity.TxFile, isS3 bool) (err error) {
if !isS3 {
osFile, err := useCases.openOSFile(file.Path)
if err != nil {
return err
}
defer osFile.Close()
}
return
}
// ProcessFile processes the file.
func (useCases *localFileUseCases) ProcessFile(file fileEntity.TxFile, osFile *os.File) (err error) {
log.Println("Processing file:", file.Name)
// Create a new reader.
reader := csv.NewReader(osFile)
// Read the file registers.
log.Println("Reading file:", file.Name)
txsAux, err := useCases.readFileRegisters(reader, file.Name)
if err != nil {
return
}
txs := txUtil.ArrayTxMemoryToArrayValue(txsAux)
err = useCases.createTransactions(txs)
return
}
// ProcessMultipartFile processes the file.
func (useCases *localFileUseCases) ProcessMultipartFile(txFile fileEntity.TxFile, file multipart.File) (err error) {
log.Println("Processing multipart file:", txFile.Name)
// Create a new reader.
reader := csv.NewReader(file)
// Read the file registers.
log.Println("Reading file:", txFile.Name)
txsAux, err := useCases.readFileRegisters(reader, txFile.Name)
if err != nil {
return
}
txs := txUtil.ArrayTxMemoryToArrayValue(txsAux)
err = useCases.createTransactions(txs)
return
}
func (useCases *localFileUseCases) openOSFile(path string) (file *os.File, err error) {
// Validate the path.
if path == "" {
err = voFile.ErrFilePathIsEmpty
return
}
// Open the file.
file, err = os.Open(path)
if err != nil {
err = voFile.ErrFileCouldNotBeOpened
return
}
return
}
func (useCases *localFileUseCases) readFileRegisters(reader *csv.Reader, fileName string) (txs []*txEntity.Transaction, err error) {
//Read the first line and ignore it.
// TODO: Check if is a valid header.
_, err = reader.Read()
if err != nil {
if err == io.EOF {
err = voFile.ErrFileIsEmpty
return
}
err = voFile.ErrFileCouldNotBeRead
return
}
lineCounter := 1
for {
log.Println("Reading line:", lineCounter)
lineCounter++
record, errRead := reader.Read()
if errRead != nil && errRead == io.EOF {
break
} else if err != nil {
txs = nil
err = errRead
break
}
// Validate the line.
userID, txDate, amount, errCheck := useCases.checkValidLine(record)
if errCheck != nil {
txs = nil
err = errCheck
break
}
errCheck = useCases.checkUser(userID)
if errCheck != nil {
txs = nil
err = errCheck
break
}
// Check if the account exists.
acc, errAcc := useCases.checkAccountByUserID(userID)
if errAcc != nil {
txs = nil
err = errAcc
break
}
// Create the transaction entity and append it to the txs slice.
tx, errTx := txEntity.NewTransaction(acc.ID, amount, txDate, fileName)
if errTx != nil {
err = errTx
txs = nil
break
}
txs = append(txs, tx)
}
if txs == nil {
log.Printf("Error reading the file %s at line %d", fileName, lineCounter)
} else {
log.Printf("File %s readed successfully", fileName)
}
return
}
func (useCases *localFileUseCases) checkValidLine(record []string) (id int64, txDate time.Time, amount float64, err error) {
if len(record) != 3 {
err = voFile.ErrFileLineIsInvalid
return
}
// Validate the position 0 as a valid int64.
id, err = strconv.ParseInt(record[0], 10, 64)
if err != nil {
err = voFile.ErrFileLineIsInvalid
return
}
// Validate the position 1 as a valid date format "1/2".
txDate, err = time.Parse("1/2", record[1])
if err != nil {
err = voFile.ErrFileLineIsInvalid
return
}
regex := `^[-|+]+[0-9]+(\.[0-9]*)?$`
match, _ := regexp.MatchString(regex, record[2])
if !match {
err = voFile.ErrFileLineIsInvalid
return
}
// Validate the position 2 as a valid float64.
amount, err = strconv.ParseFloat(record[2], 64)
if err != nil {
err = voFile.ErrFileLineIsInvalid
}
return
}
func (useCases *localFileUseCases) checkUser(ID int64) (err error) {
// Check if the user exists.
_, err = useCases.userUseCases.GetByID(ID)
if err != nil && err == voUser.ErrUserNotFound {
// Create a new user.
err = useCases.userUseCases.Create(ID, fmt.Sprintf("User Name %d", ID), fmt.Sprintf("user.email%d@amazingemail.com", ID))
if err != nil {
return
}
_, err = useCases.userUseCases.GetByID(ID)
} else {
return
}
return
}
func (useCases *localFileUseCases) checkAccountByUserID(userID int64) (account *acEntity.Account, err error) {
log.Println("Checking account for user:", userID)
// Check if the account exists.
accAux, err := useCases.accountUseCases.GetByUserID(userID)
if err != nil && err == voAccount.ErrAccountNotFound {
// Create a new account.
err = useCases.accountUseCases.Create(userID)
if err != nil {
account = nil
return
}
accAux, err = useCases.accountUseCases.GetByUserID(userID)
} else if err != nil {
account = nil
return
}
account = &accAux
return
}
func (useCases *localFileUseCases) createTransactions(txs []txEntity.Transaction) (err error) {
// TODO: If process fails at some point, the file should processed partially.
// Insert the transactions.
for _, tx := range txs {
err = useCases.transactionUseCases.Create(tx)
if err != nil {
return
}
}
return
}