Add support for non-transparent framing of syslog messages (#5148)

plugins/inputs/syslog/commons_test.go

@@ -0,0 +1,62 @@
+package syslog
+
+import (
+	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/testutil"
+	"time"
+)
+
+var (
+	pki = testutil.NewPKI("../../../testutil/pki")
+)
+
+type testCasePacket struct {
+	name           string
+	data           []byte
+	wantBestEffort *testutil.Metric
+	wantStrict     *testutil.Metric
+	werr           bool
+}
+
+type testCaseStream struct {
+	name           string
+	data           []byte
+	wantBestEffort []testutil.Metric
+	wantStrict     []testutil.Metric
+	werr           int // how many errors we expect in the strict mode?
+}
+
+func newUDPSyslogReceiver(address string, bestEffort bool) *Syslog {
+	return &Syslog{
+		Address: address,
+		now: func() time.Time {
+			return defaultTime
+		},
+		BestEffort: bestEffort,
+		Separator:  "_",
+	}
+}
+
+func newTCPSyslogReceiver(address string, keepAlive *internal.Duration, maxConn int, bestEffort bool, f Framing) *Syslog {
+	d := &internal.Duration{
+		Duration: defaultReadTimeout,
+	}
+	s := &Syslog{
+		Address: address,
+		now: func() time.Time {
+			return defaultTime
+		},
+		Framing:     f,
+		ReadTimeout: d,
+		BestEffort:  bestEffort,
+		Separator:   "_",
+	}
+	if keepAlive != nil {
+		s.KeepAlivePeriod = keepAlive
+	}
+	if maxConn > 0 {
+		s.MaxConnections = maxConn
+	}
+
+	return s
+}