add grok as a top level parser, still need README

plugins/inputs/reader/reader_test.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/influxdata/telegraf/plugins/parsers"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/assert"
 )
@@ -28,7 +29,14 @@ func TestJSONParserCompile(t *testing.T) {
 		DataFormat: "json",
 		Tags:       []string{"parent_ignored_child"},
 	}
-	r.compileParser()
+	parserConfig := parsers.Config{
+		DataFormat: r.DataFormat,
+		TagKeys:    r.Tags,
+	}
+	nParser, err := parsers.NewParser(&parserConfig)
+	r.parser = nParser
+	assert.NoError(t, err)
+
 	r.Gather(&acc)
 	log.Printf("acc: %v", acc.Metrics[0].Tags)
 	assert.Equal(t, map[string]string{"parent_ignored_child": "hi"}, acc.Metrics[0].Tags)
@@ -41,15 +49,25 @@ func TestGrokParser(t *testing.T) {
 	r := Reader{
 		Filepaths:  []string{testDir + "/reader/testfiles/grok_a.log"},
 		DataFormat: "grok",
-		Patterns:   []string{"%{COMMON_LOG_FORMAT}"},
 	}
 
-	r.compileParser()
-	err := r.Gather(&acc)
+	parserConfig := parsers.Config{
+		DataFormat: r.DataFormat,
+		TagKeys:    r.Tags,
+		Patterns:   []string{"{%COMMON-LOG-FORMAT}"},
+	}
+
+	nParser, err := parsers.NewParser(&parserConfig)
+	r.parser = nParser
+	assert.NoError(t, err)
+
+	log.Printf("path: %v", r.Filepaths[0])
+	err = r.Gather(&acc)
 	log.Printf("err: %v", err)
 	log.Printf("metric[0]_tags: %v, metric[0]_fields: %v", acc.Metrics[0].Tags, acc.Metrics[0].Fields)
 	log.Printf("metric[1]_tags: %v, metric[1]_fields: %v", acc.Metrics[1].Tags, acc.Metrics[1].Fields)
 	assert.Equal(t, 2, len(acc.Metrics))
+	t.Error()
 }
 
 func getPluginDir() string {