code cleanup, go to 1.19

.github/workflows/build.yaml

@@ -23,7 +23,7 @@ jobs:
     steps:
       - uses: actions/checkout@master
 
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v3
         with:
           go-version: 1.x
 
@@ -32,7 +32,7 @@ jobs:
           go test -race -v -bench=. -coverprofile=coverage.txt -covermode=atomic ./...
 
       - name: Upload coverage
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v3
         if: "success() && matrix.os == 'ubuntu-latest'"
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
@@ -47,7 +47,7 @@ jobs:
     steps:
       - uses: actions/checkout@master
 
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v3
         with:
           go-version: 1.x
 

.github/workflows/lint.yaml

@@ -17,10 +17,10 @@ jobs:
           - ubuntu-latest
           - macos-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v2.3.0
         with:
           # This field is required.  Dont set the patch version to always use
           # the latest patch version.
-          version: v1.48.0
+          version: v1.51.2

.golangci.yml

@@ -12,32 +12,19 @@ run:
   # autogenerated files. If it's not please let us know.
   skip-files:
     - ".*generated.*"
-    - ".*_test.go"
 
 # all available settings of specific linters
 linters-settings:
   gocyclo:
     min-complexity: 20
-  lll:
-    line-length: 200
-  depguard:
-    list-type: blacklist
-    include-go-root: false
-    packages:
-      - golang.org/x/net/context # we use context
-      - log # we use github.com/AdguardTeam/golibs/log
 
 linters:
   enable:
-    - deadcode
     - errcheck
     - govet
     - ineffassign
     - staticcheck
-    - structcheck
     - unused
-    - varcheck
-    - bodyclose
     - depguard
     - dupl
     - gocyclo
@@ -47,30 +34,19 @@ linters:
     - misspell
     - stylecheck
     - unconvert
-    - depguard
   disable-all: true
-  fast: true
-
 
 issues:
   exclude-use-default: false
 
   # List of regexps of issue texts to exclude, empty list by default.
-  # But independently from this option we use default exclude patterns,
+  # But independently of this option we use default exclude patterns,
   # it can be disabled by `exclude-use-default: false`. To list all
   # excluded by default patterns execute `golangci-lint run --help`
   exclude:
-    # errcheck defer Close
-    - error return value not checked \(defer .*\.Close()\)
-    # errcheck: Almost all programs ignore errors on these functions and in most cases it's ok
-    - Error return value of .((os\.)?std(out|err)\..*|.*Close|.*Flush|os\.Remove(All)?|.*printf?|os\.(Un)?Setenv). is not checked
-    # gosec: Duplicated errcheck checks
-    - G104
-    # gosec: Expect file permissions to be 0600 or less
-    - G302
-    # gosec: Use of weak random number generators
+    # gosec: Potential file inclusion via variable
+    # Exclude as it is required it in the command-line tool.
+    - G304
+    # gosec: Use of weak random number generator
+    # Used in tests.
     - G404
-    # errcheck defer Close
-    - error return value not checked \(defer .*\.Close()\)
-    # gosec: False positive is triggered by 'src, err := os.ReadFile(filename)'
-    - Potential file inclusion via variable

cmd/main.go

@@ -1,3 +1,4 @@
+// Package main is responsible for the command-line interface.
 package main
 
 import (

encrypted_query.go

@@ -49,7 +49,7 @@ func (q *EncryptedQuery) Encrypt(packet []byte, sharedKey [sharedKeySize]byte) (
 
 	// Step 1: generate nonce
 	binary.BigEndian.PutUint64(q.Nonce[:8], uint64(time.Now().UnixNano()))
-	rand.Read(q.Nonce[8:12])
+	_, _ = rand.Read(q.Nonce[8:12])
 
 	// Unencrypted part of the query:
 	// <client-magic> <client-pk> <client-nonce>

encrypted_response.go

@@ -32,7 +32,7 @@ func (r *EncryptedResponse) Encrypt(packet []byte, sharedKey [sharedKeySize]byte
 	var response []byte
 
 	// Step 1: generate nonce
-	rand.Read(r.Nonce[12:16])
+	_, _ = rand.Read(r.Nonce[12:16])
 	binary.BigEndian.PutUint64(r.Nonce[16:nonceSize], uint64(time.Now().UnixNano()))
 
 	// Unencrypted part of the query:

server_test.go

@@ -262,8 +262,12 @@ func newTestServer(t require.TestingT, handler Handler) *testServer {
 	srv.udpConn, err = net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
 	require.NoError(t, err)
 
-	go s.ServeUDP(srv.udpConn)
-	go s.ServeTCP(srv.tcpListen)
+	go func() {
+		_ = s.ServeUDP(srv.udpConn)
+	}()
+	go func() {
+		_ = s.ServeTCP(srv.tcpListen)
+	}()
 	return srv
 }