Add new line protocol parser and serializer, influxdb output (#3924)

plugins/serializers/influx/escape.go

@@ -0,0 +1,52 @@
+package influx
+
+import "strings"
+
+const (
+	escapes            = " ,="
+	nameEscapes        = " ,"
+	stringFieldEscapes = `\"`
+)
+
+var (
+	escaper = strings.NewReplacer(
+		`,`, `\,`,
+		`"`, `\"`, // ???
+		` `, `\ `,
+		`=`, `\=`,
+	)
+
+	nameEscaper = strings.NewReplacer(
+		`,`, `\,`,
+		` `, `\ `,
+	)
+
+	stringFieldEscaper = strings.NewReplacer(
+		`"`, `\"`,
+		`\`, `\\`,
+	)
+)
+
+func escape(s string) string {
+	if strings.ContainsAny(s, escapes) {
+		return escaper.Replace(s)
+	} else {
+		return s
+	}
+}
+
+func nameEscape(s string) string {
+	if strings.ContainsAny(s, nameEscapes) {
+		return nameEscaper.Replace(s)
+	} else {
+		return s
+	}
+}
+
+func stringFieldEscape(s string) string {
+	if strings.ContainsAny(s, stringFieldEscapes) {
+		return stringFieldEscaper.Replace(s)
+	} else {
+		return s
+	}
+}