daemon/logger/jsonfilelog/jsonlog: use native Go fuzzing

Replace go-fuzz-headers with native fuzz parameters.

Constructing JSONLogs directly simplifies the fuzz target and also
allows exercising a range of valid time.Time values, whereas the
previous fuzzer left Created as the zero value.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/logger/jsonfilelog/jsonlog/fuzz_test.go

@@ -2,20 +2,23 @@ package jsonlog
 
 import (
 	"bytes"
+	"encoding/json"
 	"testing"
-
-	fuzz "github.com/AdaLogics/go-fuzz-headers"
+	"time"
 )
 
 func FuzzJSONLogsMarshalJSONBuf(f *testing.F) {
-	f.Fuzz(func(t *testing.T, data []byte) {
-		ff := fuzz.NewConsumer(data)
-		l := &JSONLogs{}
-		err := ff.GenerateStruct(l)
-		if err != nil {
-			return
+	f.Fuzz(func(t *testing.T, log []byte, stream string, created int64, rawAttrs []byte) {
+		l := &JSONLogs{
+			Log:      log,
+			Stream:   stream,
+			Created:  time.Unix(0, created),
+			RawAttrs: json.RawMessage(rawAttrs),
 		}
+		// Exercise MarshalJSONBuf with arbitrary inputs. Errors are expected
+		// for some generated times; the fuzz target is only checking that it
+		// doesn't panic.
 		var buf bytes.Buffer
-		l.MarshalJSONBuf(&buf)
+		_ = l.MarshalJSONBuf(&buf)
 	})
 }