window_event_input config add mapstructure support (#62)

* eventLog add mapstructure support

operator/builtin/input/windows/operator.go

@@ -27,16 +27,16 @@ import (
 )
 
 func init() {
-	operator.Register("windows_eventlog_input", NewDefaultConfig)
+	operator.Register("windows_eventlog_input", func() operator.Builder { return NewDefaultConfig() })
 }
 
 // EventLogConfig is the configuration of a windows event log operator.
 type EventLogConfig struct {
-	helper.InputConfig `yaml:",inline"`
-	Channel            string          `json:"channel" yaml:"channel"`
-	MaxReads           int             `json:"max_reads,omitempty" yaml:"max_reads,omitempty"`
-	StartAt            string          `json:"start_at,omitempty" yaml:"start_at,omitempty"`
-	PollInterval       helper.Duration `json:"poll_interval,omitempty" yaml:"poll_interval,omitempty"`
+	helper.InputConfig `mapstructure:",squash" yaml:",inline"`
+	Channel            string          `mapstructure:"channel" json:"channel" yaml:"channel"`
+	MaxReads           int             `mapstructure:"max_reads,omitempty" json:"max_reads,omitempty" yaml:"max_reads,omitempty"`
+	StartAt            string          `mapstructure:"start_at,omitempty" json:"start_at,omitempty" yaml:"start_at,omitempty"`
+	PollInterval       helper.Duration `mapstructure:"poll_interval,omitempty" json:"poll_interval,omitempty" yaml:"poll_interval,omitempty"`
 }
 
 // Build will build a windows event log operator.
@@ -73,7 +73,7 @@ func (c *EventLogConfig) Build(context operator.BuildContext) ([]operator.Operat
 }
 
 // NewDefaultConfig will return an event log config with default values.
-func NewDefaultConfig() operator.Builder {
+func NewDefaultConfig() *EventLogConfig {
 	return &EventLogConfig{
 		InputConfig: helper.NewInputConfig("", "windows_eventlog_input"),
 		MaxReads:    100,

operator/builtin/input/windows/operator_test.go

@@ -0,0 +1,47 @@
+// Copyright  The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build windows
+
+package windows
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/open-telemetry/opentelemetry-log-collection/entry"
+	"github.com/open-telemetry/opentelemetry-log-collection/operator/helper"
+)
+
+func TestEventLogConfig(t *testing.T) {
+	expect := NewDefaultConfig()
+	expect.WriteTo = entry.NewRecordField("to")
+
+	input := map[string]interface{}{
+		"id":            "",
+		"type":          "windows_eventlog_input",
+		"max_reads":     100,
+		"start_at":      "end",
+		"poll_interval": "1s",
+		"attributes":    map[string]interface{}{},
+		"resource":      map[string]interface{}{},
+		"write_to":      "$record.to",
+	}
+
+	var actual EventLogConfig
+	err := helper.UnmarshalMapstructure(input, &actual)
+	require.NoError(t, err)
+	require.Equal(t, expect, &actual)
+}