Add Suricata input plugin (#3145)

plugins/inputs/suricata/suricata_testutil.go

@@ -0,0 +1,38 @@
+package suricata
+
+import (
+	"bytes"
+	"sync"
+)
+
+// A thread-safe Buffer wrapper to enable concurrent access to log output.
+type buffer struct {
+	b bytes.Buffer
+	m sync.Mutex
+}
+
+func (b *buffer) Read(p []byte) (n int, err error) {
+	b.m.Lock()
+	defer b.m.Unlock()
+	return b.b.Read(p)
+}
+func (b *buffer) Write(p []byte) (n int, err error) {
+	b.m.Lock()
+	defer b.m.Unlock()
+	return b.b.Write(p)
+}
+func (b *buffer) String() string {
+	b.m.Lock()
+	defer b.m.Unlock()
+	return b.b.String()
+}
+func (b *buffer) Reset() {
+	b.m.Lock()
+	defer b.m.Unlock()
+	b.b.Reset()
+}
+func (b *buffer) Bytes() []byte {
+	b.m.Lock()
+	defer b.m.Unlock()
+	return b.b.Bytes()
+}