Refactor InfluxDB listener (#6974)

Use streaming parser in InfluxDB listener

plugins/parsers/dropwizard/parser.go

@@ -17,6 +17,8 @@ import (
 var fieldEscaper = strings.NewReplacer("\\", "\\\\", "\"", "\\\"")
 var keyEscaper = strings.NewReplacer(" ", "\\ ", ",", "\\,", "=", "\\=")
 
+type TimeFunc func() time.Time
+
 // Parser parses json inputs containing dropwizard metrics,
 // either top-level or embedded inside a json field.
 // This parser is using gjson for retrieving paths within the json file.
@@ -48,7 +50,7 @@ type parser struct {
 	separator      string
 	templateEngine *templating.Engine
 
-	timeFunc metric.TimeFunc
+	timeFunc TimeFunc
 
 	// seriesParser parses line protocol measurement + tags
 	seriesParser *influx.Parser
@@ -267,6 +269,6 @@ func (p *parser) readDWMetrics(metricType string, dwms interface{}, metrics []te
 	return metrics
 }
 
-func (p *parser) SetTimeFunc(f metric.TimeFunc) {
+func (p *parser) SetTimeFunc(f TimeFunc) {
 	p.timeFunc = f
 }

plugins/parsers/dropwizard/parser_test.go

@@ -13,7 +13,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-var TimeFunc = func() time.Time {
+var testTimeFunc = func() time.Time {
 	return time.Unix(0, 0)
 }
 
@@ -528,7 +528,7 @@ func TestDropWizard(t *testing.T) {
 						map[string]interface{}{
 							"value": 42.0,
 						},
-						TimeFunc(),
+						testTimeFunc(),
 					),
 				),
 			},
@@ -547,7 +547,7 @@ func TestDropWizard(t *testing.T) {
 						map[string]interface{}{
 							"value": 42.0,
 						},
-						TimeFunc(),
+						testTimeFunc(),
 					),
 				),
 			},
@@ -573,7 +573,7 @@ func TestDropWizard(t *testing.T) {
 						map[string]interface{}{
 							"value": 42.0,
 						},
-						TimeFunc(),
+						testTimeFunc(),
 					),
 				),
 			},
@@ -584,7 +584,7 @@ func TestDropWizard(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			parser := NewParser()
-			parser.SetTimeFunc(TimeFunc)
+			parser.SetTimeFunc(testTimeFunc)
 			metrics, err := parser.Parse(tt.input)
 			tt.errFunc(t, err)