Fix lint errors

.golangci.yaml

@@ -1,10 +1,18 @@
 run:
   modules-download-mode: readonly
-  skip-dirs:
-    - .git
-    - .github
-    - .vscode
-    - dist
+
+linters-settings:
+  gofmt:
+    simplify: true
+  goimports:
+    local-prefixes: github.com/axiomhq/axiom-syslog-proxy
+  govet:
+    enable:
+      - shadow
+  nolintlint:
+    allow-unused: false
+    require-explanation: true
+    require-specific: true
 
 linters:
   disable-all: true
@@ -34,15 +42,9 @@ linters:
     - unused
     - whitespace
 
-linters-settings:
-  gofmt:
-    simplify: true
-  goimports:
-    local-prefixes: github.com/axiomhq/axiom-syslog-proxy
-  govet:
-    check-shadowing: true
-  nolintlint:
-    allow-unused: false
-    allow-leading-space: false
-    require-explanation: true
-    require-specific: true
+issues:
+  exclude-dirs:
+    - .git
+    - .github
+    - .vscode
+    - dist

parser/parse.go

@@ -146,7 +146,7 @@ func parseJSON(data []byte) (*Log, error) {
 		Metadata: map[string]interface{}{},
 	}
 
-	if err := jsonparser.ObjectEach(data, func(key []byte, value []byte, dataType jsonparser.ValueType, offset int) error {
+	if err := jsonparser.ObjectEach(data, func(key []byte, value []byte, dataType jsonparser.ValueType, _ int) error {
 		return extractJSONProperty(key, value, dataType, msg)
 	}); err != nil {
 		return nil, err
@@ -197,15 +197,15 @@ func extractMetadataValue(concatKey string, value []byte, dataType jsonparser.Va
 	switch dataType {
 	case jsonparser.Object:
 		level++
-		if err := jsonparser.ObjectEach(value, func(kk []byte, vv []byte, dtdt jsonparser.ValueType, offset int) error {
+		if err := jsonparser.ObjectEach(value, func(kk []byte, vv []byte, dtdt jsonparser.ValueType, _ int) error {
 			return extractMetadataValue(joinKey(concatKey, string(kk)), vv, dtdt, level, msg)
 		}); err != nil {
 			return err
 		}
 	case jsonparser.Array:
 		arrayIndex := 0
 		level++
-		if _, err := jsonparser.ArrayEach(value, func(vv []byte, dtdt jsonparser.ValueType, offset int, err error) {
+		if _, err := jsonparser.ArrayEach(value, func(vv []byte, dtdt jsonparser.ValueType, _ int, err error) {
 			if err != nil {
 				return
 			}

parser/parse_test.go

@@ -694,7 +694,7 @@ func BenchmarkParserDifferentMetadataTypes(b *testing.B) {
 }
 
 func BenchmarkParser(b *testing.B) {
-	p := New(func(msg *Log) {})
+	p := New(func(_ *Log) {})
 
 	const msg = "<1> 2009-10-16T11:51:56+02:00 ip-34-23-211-23 symbolicator ERROR 2008 SOMEMSG - hello"
 	rawMsg := []byte(msg)

parser/syslog.go

@@ -570,10 +570,10 @@ func parseStructuredData(data []byte, index *int, length *int) (map[string]map[s
 	sc := scanner.Scanner{}
 	sc.Init(bytes.NewBuffer(data[offset+1:]))
 	sc.Mode = scanner.ScanStrings | scanner.ScanIdents
-	sc.IsIdentRune = func(ch rune, i int) bool {
+	sc.IsIdentRune = func(ch rune, _ int) bool {
 		return unicode.IsLetter(ch) || unicode.IsDigit(ch) || ch == '@' || ch == '.'
 	}
-	sc.Error = func(s *scanner.Scanner, msg string) {}
+	sc.Error = func(_ *scanner.Scanner, _ string) {}
 
 	var (
 		sdID, sdParam string