feat: Added "json" action to decode field and copy resulting fields i…

…nto root of event

lc-lib/processor/actionjson.go

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2012-2020 Jason Woods and contributors
+ *
+ * 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.
+ */
+
+package processor
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/driskell/log-courier/lc-lib/config"
+	"github.com/driskell/log-courier/lc-lib/event"
+)
+
+type jsonAction struct {
+	Field  string `config:"field"`
+	Remove bool   `config:"remove"`
+}
+
+func newJsonAction(p *config.Parser, configPath string, unused map[string]interface{}, name string) (ASTEntry, error) {
+	var err error
+	action := &jsonAction{}
+	if err = p.Populate(action, unused, configPath, true); err != nil {
+		return nil, err
+	}
+	return action, nil
+}
+
+func (g *jsonAction) Validate(p *config.Parser, configPath string) error {
+	return nil
+}
+
+func (g *jsonAction) Process(evnt *event.Event) *event.Event {
+	entry, err := evnt.Resolve(g.Field, nil)
+	if err != nil {
+		evnt.AddError("json", fmt.Sprintf("Field '%s' failed to resolve: %s", g.Field, err))
+		return evnt
+	}
+
+	var (
+		value string
+		ok    bool
+	)
+	if value, ok = entry.(string); !ok {
+		evnt.AddError("json", fmt.Sprintf("Field '%s' is not present or not a string", g.Field))
+		return evnt
+	}
+
+	var v map[string]interface{}
+	err = json.Unmarshal([]byte(value), &v)
+	if err != nil {
+		evnt.AddError("json", fmt.Sprintf("Decode of field '%s' failed: %s", g.Field, err.Error()))
+		return evnt
+	}
+	for name, value := range v {
+		_, err = evnt.Resolve(name, value)
+		if err != nil {
+			evnt.AddError("json", fmt.Sprintf("Decode of field '%s' failed: %s", g.Field, err.Error()))
+			return evnt
+		}
+	}
+	if g.Remove {
+		_, err := evnt.Resolve(g.Field, event.ResolveParamUnset)
+		if err != nil {
+			evnt.AddError("json", fmt.Sprintf("Failed to remove field '%s': %s", g.Field, err))
+		}
+	}
+	return evnt
+}
+
+// init will register the action
+func init() {
+	RegisterAction("json", newJsonAction)
+}