forked from blox/blox
/
processor.go
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/
processor.go
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// Copyright 2016-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 event
import (
"encoding/json"
"github.com/blox/blox/cluster-state-service/handler/store"
"github.com/pkg/errors"
)
// Unmarshal event message json by type
type eventType struct {
Type string `json:"detail-type"`
}
// Detail-type in the event stream message must match one of these strings
const (
taskType = "ECS Task State Change"
containerInstanceType = "ECS Container Instance State Change"
)
// Processor defines methods to process events
type Processor interface {
ProcessEvent(event string) error
}
type eventProcessor struct {
stores store.Stores
}
func NewProcessor(stores store.Stores) Processor {
return eventProcessor{
stores: stores,
}
}
// ProcessEvent takes an event JSON, unmarhsals and stores it in the datastore
func (processor eventProcessor) ProcessEvent(event string) error {
if event == "" {
return errors.New("Event cannot be empty")
}
// Determine the type of event based on the detail-type in the message
var et eventType
err := json.Unmarshal([]byte(event), &et)
if err != nil {
return errors.Wrapf(err, "Error unmarshaling event '%s' in the processor", event)
}
switch et.Type {
case taskType:
err = processor.stores.TaskStore.AddTask(event)
if err != nil {
return err
}
case containerInstanceType:
err = processor.stores.ContainerInstanceStore.AddContainerInstance(event)
if err != nil {
return err
}
default:
return errors.Errorf("Unrecognized task type: %v", et.Type)
}
return nil
}