[#638] Update to Go 1.16

Changes:

  * replace `iotuil` elements with the ones from `os` package;
  * replace `os.Filemode` with `fs.FileMode`;
  * use `signal.NotifyContext` instead of `NewGracefulContext` (removed).

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/util/locode/db/airports/db.go

@@ -2,7 +2,7 @@ package airportsdb
 
 import (
 	"fmt"
-	"os"
+	"io/fs"
 	"sync"
 )
 
@@ -41,7 +41,7 @@ type DB struct {
 
 type pathMode struct {
 	path string
-	mode os.FileMode
+	mode fs.FileMode
 }
 
 const invalidPrmValFmt = "invalid parameter %s (%T):%v"

pkg/util/locode/db/airports/opts.go

@@ -1,19 +1,19 @@
 package airportsdb
 
 import (
-	"os"
+	"io/fs"
 )
 
 // Option sets an optional parameter of DB.
 type Option func(*options)
 
 type options struct {
-	airportMode, countryMode os.FileMode
+	airportMode, countryMode fs.FileMode
 }
 
 func defaultOpts() *options {
 	return &options{
-		airportMode: os.ModePerm, // 0777
-		countryMode: os.ModePerm, // 0777
+		airportMode: fs.ModePerm, // 0777
+		countryMode: fs.ModePerm, // 0777
 	}
 }

pkg/util/locode/db/boltdb/db.go

@@ -2,7 +2,7 @@ package locodebolt
 
 import (
 	"fmt"
-	"os"
+	"io/fs"
 
 	"go.etcd.io/bbolt"
 )
@@ -34,7 +34,7 @@ type Prm struct {
 type DB struct {
 	path string
 
-	mode os.FileMode
+	mode fs.FileMode
 
 	boltOpts *bbolt.Options
 

pkg/util/locode/db/boltdb/opts.go

@@ -1,6 +1,7 @@
 package locodebolt
 
 import (
+	"io/fs"
 	"os"
 	"time"
 
@@ -11,7 +12,7 @@ import (
 type Option func(*options)
 
 type options struct {
-	mode os.FileMode
+	mode fs.FileMode
 
 	boltOpts *bbolt.Options
 }

pkg/util/locode/db/continents/geojson/calls.go

@@ -2,7 +2,7 @@ package continentsdb
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	locodedb "github.com/nspcc-dev/neofs-node/pkg/util/locode/db"
 	"github.com/paulmach/orb"
@@ -53,7 +53,7 @@ func (db *DB) PointContinent(point *locodedb.Point) (*locodedb.Continent, error)
 }
 
 func (db *DB) init() error {
-	data, err := ioutil.ReadFile(db.path)
+	data, err := os.ReadFile(db.path)
 	if err != nil {
 		return fmt.Errorf("could not read data file: %w", err)
 	}

pkg/util/locode/table/csv/opts.go

@@ -1,14 +1,14 @@
 package csvlocode
 
 import (
-	"os"
+	"io/fs"
 )
 
 // Option sets an optional parameter of Table.
 type Option func(*options)
 
 type options struct {
-	mode os.FileMode
+	mode fs.FileMode
 
 	extraPaths []string
 }

pkg/util/locode/table/csv/table.go

@@ -2,7 +2,7 @@ package csvlocode
 
 import (
 	"fmt"
-	"os"
+	"io/fs"
 	"sync"
 )
 
@@ -32,7 +32,7 @@ type Prm struct {
 type Table struct {
 	paths []string
 
-	mode os.FileMode
+	mode fs.FileMode
 
 	subDivPath string