update to go 1.13 errors

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - 1.12.x
+  - 1.13.x
 
 services:
   - postgresql

error.go

@@ -1,6 +1,7 @@
 package pgsql
 
 import (
+	"errors"
 	"regexp"
 
 	"github.com/lib/pq"
@@ -18,7 +19,8 @@ func contains(xs []string, x string) bool {
 // IsUniqueViolation checks is error an unique_violation with given constraint,
 // constraint can be empty to ignore constraint name checks
 func IsUniqueViolation(err error, constraint ...string) bool {
-	if pqErr, ok := err.(*pq.Error); ok && pqErr.Code == "23505" {
+	var pqErr *pq.Error
+	if errors.As(err, &pqErr) && pqErr.Code == "23505" {
 		if len(constraint) == 0 {
 			return true
 		}
@@ -29,15 +31,17 @@ func IsUniqueViolation(err error, constraint ...string) bool {
 
 // IsInvalidTextRepresentation checks is error an invalid_text_representation
 func IsInvalidTextRepresentation(err error) bool {
-	if pqErr, ok := err.(*pq.Error); ok && pqErr.Code == "22P02" {
+	var pqErr *pq.Error
+	if errors.As(err, &pqErr) && pqErr.Code == "22P02" {
 		return true
 	}
 	return false
 }
 
 // IsForeignKeyViolation checks is error an foreign_key_violation
 func IsForeignKeyViolation(err error, constraint ...string) bool {
-	if pqErr, ok := err.(*pq.Error); ok && pqErr.Code == "23503" {
+	var pqErr *pq.Error
+	if errors.As(err, &pqErr) && pqErr.Code == "23503" {
 		if len(constraint) == 0 {
 			return true
 		}

go.mod

@@ -1,6 +1,6 @@
 module github.com/acoshift/pgsql
 
-go 1.12
+go 1.13
 
 require (
 	github.com/DATA-DOG/go-sqlmock v1.3.3

pgctx/pgctx.go

@@ -3,6 +3,7 @@ package pgctx
 import (
 	"context"
 	"database/sql"
+	"errors"
 	"net/http"
 
 	"github.com/acoshift/pgsql"
@@ -53,7 +54,7 @@ func RunInTx(ctx context.Context, f func(ctx context.Context) error) error {
 		ctx := context.WithValue(ctx, ctxKeyQueryer{}, tx)
 		ctx = context.WithValue(ctx, ctxKeyCommitted{}, cm)
 		err := f(ctx)
-		if err == pgsql.ErrAbortTx {
+		if errors.Is(err, pgsql.ErrAbortTx) {
 			abort = true
 		}
 		return err

tx.go

@@ -75,11 +75,11 @@ func RunInTxContext(ctx context.Context, db BeginTxer, opts *TxOptions, fn func(
 
 	for i := 0; i < option.MaxAttempts; i++ {
 		err := f()
-		if err == nil || err == ErrAbortTx {
+		if err == nil || errors.Is(err, ErrAbortTx) {
 			return nil
 		}
-		pqErr, ok := err.(*pq.Error)
-		if retryable := ok && (pqErr.Code == "40001"); !retryable {
+		var pqErr *pq.Error
+		if retryable := errors.As(err, &pqErr) && (pqErr.Code == "40001"); !retryable {
 			return err
 		}
 	}