Use errors instead xerrors

go.mod

@@ -3,7 +3,6 @@ module github.com/khasanovbi/banksdb/v2
 require (
 	github.com/armon/go-radix v1.0.0
 	github.com/stretchr/testify v1.3.0
-	golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7
 	gopkg.in/src-d/go-billy.v4 v4.3.2
 	gopkg.in/src-d/go-git.v4 v4.13.1
 )

go.sum

@@ -66,8 +66,6 @@ golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190729092621-ff9f1409240a h1:mEQZbbaBjWyLNy0tmZmgEuQAR8XOQ3hL8GYi3J/NG64=
 golang.org/x/tools v0.0.0-20190729092621-ff9f1409240a/go.mod h1:jcCCGcm9btYwXyDqrUWc6MKQKKGJCWEQ3AfLSRIbEuI=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 h1:9zdDQZ7Thm29KFXgAX/+yaf3eVbP7djjWp/dXAppNCc=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/src-d/go-billy.v4 v4.3.2 h1:0SQA1pRztfTFx2miS8sA97XvooFeNOmvUenF4o0EcVg=

paymentsystem/payment_system.go

@@ -2,10 +2,10 @@ package paymentsystem
 
 import (
 	"errors"
+	"fmt"
 	"strconv"
 
 	"github.com/armon/go-radix"
-	"golang.org/x/xerrors"
 )
 
 // PaymentSystem represent system used to settle financial transactions.
@@ -92,7 +92,7 @@ func (r *radixDB) InitFromMap(rawPaymentSystems map[PaymentSystem][]paymentSyste
 			for _, prefixRange := range paymentSystemParam.prefixRanges {
 				rangePrefixes, err := splitPrefixRange(prefixRange)
 				if err != nil {
-					return xerrors.Errorf("prefix range split error: %w", err)
+					return fmt.Errorf("prefix range split error: %w", err)
 				}
 
 				prefixes = append(prefixes, rangePrefixes...)
@@ -105,7 +105,7 @@ func (r *radixDB) InitFromMap(rawPaymentSystems map[PaymentSystem][]paymentSyste
 				if isUpdated {
 					oldPaymentSystem := oldValue.(*radixValue).paymentSystem
 
-					return xerrors.Errorf(
+					return fmt.Errorf(
 						"prefix=%d, old=%s, new=%s: %w",
 						prefix,
 						oldPaymentSystem,

paymentsystem/payment_system_test.go

@@ -2,11 +2,11 @@
 package paymentsystem
 
 import (
+	"errors"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 	"github.com/stretchr/testify/suite"
-	"golang.org/x/xerrors"
 )
 
 func TestFindPaymentSystem(t *testing.T) {
@@ -88,7 +88,7 @@ func (suite *RadixDBTestSuite) TestInitErrorAtSamePrefix() {
 			{prefixes: []int{1}, lengthChecker: &exactLengthChecker{Exact: 5}},
 		},
 	})
-	suite.Require().True(xerrors.Is(err, errNonUniquePrefix))
+	suite.Require().True(errors.Is(err, errNonUniquePrefix))
 }
 
 func TestRadixDBTestSuite(t *testing.T) {

paymentsystem/prefix_range_splitter.go

@@ -1,11 +1,10 @@
 package paymentsystem
 
 import (
+	"fmt"
 	"math"
 	"strconv"
 	"strings"
-
-	"golang.org/x/xerrors"
 )
 
 func findCommonPrefixLength(first string, second string) int {
@@ -99,7 +98,7 @@ func splitPrefixRange(prefixRange prefixRange) ([]int, error) {
 	toStr := strconv.Itoa(prefixRange.to)
 
 	if len(fromStr) != len(toStr) {
-		return nil, xerrors.Errorf("different prefix range lengths, from='%s', to='%s'", fromStr, toStr)
+		return nil, fmt.Errorf("different prefix range lengths, from='%s', to='%s'", fromStr, toStr)
 	}
 
 	strPrefixes := splitPrefixRangeStr(fromStr, toStr)
@@ -110,7 +109,7 @@ func splitPrefixRange(prefixRange prefixRange) ([]int, error) {
 		prefix, err := strconv.Atoi(strPrefix)
 		// Shouldn't be never not nil.
 		if err != nil {
-			return nil, xerrors.Errorf("prefix to int convert error: %w", err)
+			return nil, fmt.Errorf("prefix to int convert error: %w", err)
 		}
 
 		result = append(result, prefix)