Model transformer: model reconciliation for agent upgrades

agent/data/client.go

@@ -19,7 +19,9 @@ import (
 
 	"github.com/aws/amazon-ecs-agent/agent/api/container"
 	"github.com/aws/amazon-ecs-agent/agent/api/task"
+	"github.com/aws/amazon-ecs-agent/agent/data/transformationfunctions"
 	"github.com/aws/amazon-ecs-agent/agent/engine/image"
+	"github.com/aws/amazon-ecs-agent/ecs-agent/modeltransformer"
 	"github.com/aws/amazon-ecs-agent/ecs-agent/netlib/model/networkinterface"
 	bolt "go.etcd.io/bbolt"
 )
@@ -33,6 +35,7 @@ const (
 	imagesBucketName         = "images"
 	eniAttachmentsBucketName = "eniattachments"
 	metadataBucketName       = "metadata"
+	emptyAgentVersionMsg     = "No version info available in boltDB. Either this is a fresh instance, or we were using state file to persist data. Transformer not applicable."
 )
 
 var (
@@ -94,7 +97,8 @@ type Client interface {
 
 // client implements the Client interface using boltdb as the backing data store.
 type client struct {
-	db *bolt.DB
+	db          *bolt.DB
+	transformer *modeltransformer.Transformer
 }
 
 // New returns a data client that implements the Client interface with boltdb.
@@ -115,7 +119,8 @@ func NewWithSetup(dataDir string) (Client, error) {
 	return setup(dataDir)
 }
 
-// setup initiates the boltdb client and makes sure the buckets we use are created.
+// setup initiates the boltdb client and makes sure the buckets we use and transformer are created, and
+// registers transformation functions to transformer.
 func setup(dataDir string) (*client, error) {
 	db, err := bolt.Open(filepath.Join(dataDir, dbName), dbMode, nil)
 	err = db.Update(func(tx *bolt.Tx) error {
@@ -128,11 +133,19 @@ func setup(dataDir string) (*client, error) {
 
 		return nil
 	})
+
+	// create transformer
+	transformer := modeltransformer.NewTransFormer()
+
+	// registering task transformation functions
+	transformationfunctions.RegisterTaskTransformationFunctions(transformer)
+
 	if err != nil {
 		return nil, err
 	}
 	return &client{
-		db: db,
+		db:          db,
+		transformer: transformer,
 	}, nil
 }
 

agent/data/client_test.go

@@ -20,6 +20,8 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/aws/amazon-ecs-agent/ecs-agent/modeltransformer"
+
 	"github.com/stretchr/testify/require"
 	bolt "go.etcd.io/bbolt"
 )
@@ -28,6 +30,7 @@ func newTestClient(t *testing.T) Client {
 	testDir := t.TempDir()
 
 	testDB, err := bolt.Open(filepath.Join(testDir, dbName), dbMode, nil)
+	transformer := modeltransformer.NewTransFormer()
 	require.NoError(t, err)
 	require.NoError(t, testDB.Update(func(tx *bolt.Tx) error {
 		for _, b := range buckets {
@@ -40,7 +43,8 @@ func newTestClient(t *testing.T) Client {
 		return nil
 	}))
 	testClient := &client{
-		db: testDB,
+		db:          testDB,
+		transformer: transformer,
 	}
 
 	t.Cleanup(func() {

agent/data/models/task_models.go

@@ -0,0 +1,115 @@
+// Copyright 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.
+
+//lint:file-ignore U1000 Ignore unused fields as some of them are only used by Fargate
+
+package models
+
+import (
+	"sync"
+	"time"
+
+	apicontainer "github.com/aws/amazon-ecs-agent/agent/api/container"
+	"github.com/aws/amazon-ecs-agent/agent/api/serviceconnect"
+	"github.com/aws/amazon-ecs-agent/agent/api/task"
+	apitaskstatus "github.com/aws/amazon-ecs-agent/agent/api/task/status"
+	resourcetype "github.com/aws/amazon-ecs-agent/agent/taskresource/types"
+	nlappmesh "github.com/aws/amazon-ecs-agent/ecs-agent/netlib/model/appmesh"
+)
+
+// Task_1_0_0 is "the original model" before model transformer is created.
+type Task_1_0_0 struct {
+	Arn                                    string
+	id                                     string
+	Overrides                              task.TaskOverrides `json:"-"`
+	Family                                 string
+	Version                                string
+	ServiceName                            string
+	Containers                             []*apicontainer.Container
+	Associations                           []task.Association        `json:"associations"`
+	ResourcesMapUnsafe                     resourcetype.ResourcesMap `json:"resources"`
+	Volumes                                []task.TaskVolume         `json:"volumes"`
+	CPU                                    float64                   `json:"Cpu,omitempty"`
+	Memory                                 int64                     `json:"Memory,omitempty"`
+	DesiredStatusUnsafe                    apitaskstatus.TaskStatus  `json:"DesiredStatus"`
+	KnownStatusUnsafe                      apitaskstatus.TaskStatus  `json:"KnownStatus"`
+	KnownStatusTimeUnsafe                  time.Time                 `json:"KnownTime"`
+	PullStartedAtUnsafe                    time.Time                 `json:"PullStartedAt"`
+	PullStoppedAtUnsafe                    time.Time                 `json:"PullStoppedAt"`
+	ExecutionStoppedAtUnsafe               time.Time                 `json:"ExecutionStoppedAt"`
+	SentStatusUnsafe                       apitaskstatus.TaskStatus  `json:"SentStatus"`
+	ExecutionCredentialsID                 string                    `json:"executionCredentialsID"`
+	credentialsID                          string
+	credentialsRelativeURIUnsafe           string
+	ENIs                                   task.TaskENIs `json:"ENI"`
+	AppMesh                                *nlappmesh.AppMesh
+	MemoryCPULimitsEnabled                 bool                `json:"MemoryCPULimitsEnabled,omitempty"`
+	PlatformFields                         task.PlatformFields `json:"PlatformFields,omitempty"`
+	terminalReason                         string
+	terminalReasonOnce                     sync.Once
+	PIDMode                                string `json:"PidMode,omitempty"`
+	IPCMode                                string `json:"IpcMode,omitempty"`
+	NvidiaRuntime                          string `json:"NvidiaRuntime,omitempty"`
+	LocalIPAddressUnsafe                   string `json:"LocalIPAddress,omitempty"`
+	LaunchType                             string `json:"LaunchType,omitempty"`
+	lock                                   sync.RWMutex
+	setIdOnce                              sync.Once
+	ServiceConnectConfig                   *serviceconnect.Config `json:"ServiceConnectConfig,omitempty"`
+	ServiceConnectConnectionDrainingUnsafe bool                   `json:"ServiceConnectConnectionDraining,omitempty"`
+	NetworkMode                            string                 `json:"NetworkMode,omitempty"`
+	IsInternal                             bool                   `json:"IsInternal,omitempty"`
+}
+
+// Task_1_x_0 is an example new model with breaking change. Latest Task_1_x_0 should be the same as current Task model.
+// TODO: update this model when introducing first actual transformation function
+type Task_1_x_0 struct {
+	Arn                                    string
+	id                                     string
+	Overrides                              task.TaskOverrides `json:"-"`
+	Family                                 string
+	Version                                string
+	ServiceName                            string
+	Containers                             []*apicontainer.Container
+	Associations                           []task.Association        `json:"associations"`
+	ResourcesMapUnsafe                     resourcetype.ResourcesMap `json:"resources"`
+	Volumes                                []task.TaskVolume         `json:"volumes"`
+	CPU                                    float64                   `json:"Cpu,omitempty"`
+	Memory                                 int64                     `json:"Memory,omitempty"`
+	DesiredStatusUnsafe                    apitaskstatus.TaskStatus  `json:"DesiredStatus"`
+	KnownStatusUnsafe                      apitaskstatus.TaskStatus  `json:"KnownStatus"`
+	KnownStatusTimeUnsafe                  time.Time                 `json:"KnownTime"`
+	PullStartedAtUnsafe                    time.Time                 `json:"PullStartedAt"`
+	PullStoppedAtUnsafe                    time.Time                 `json:"PullStoppedAt"`
+	ExecutionStoppedAtUnsafe               time.Time                 `json:"ExecutionStoppedAt"`
+	SentStatusUnsafe                       apitaskstatus.TaskStatus  `json:"SentStatus"`
+	ExecutionCredentialsID                 string                    `json:"executionCredentialsID"`
+	credentialsID                          string
+	credentialsRelativeURIUnsafe           string
+	NetworkInterfaces                      task.TaskENIs `json:"NetworkInterfaces"`
+	AppMesh                                *nlappmesh.AppMesh
+	MemoryCPULimitsEnabled                 bool                `json:"MemoryCPULimitsEnabled,omitempty"`
+	PlatformFields                         task.PlatformFields `json:"PlatformFields,omitempty"`
+	terminalReason                         string
+	terminalReasonOnce                     sync.Once
+	PIDMode                                string `json:"PidMode,omitempty"`
+	IPCMode                                string `json:"IpcMode,omitempty"`
+	NvidiaRuntime                          string `json:"NvidiaRuntime,omitempty"`
+	LocalIPAddressUnsafe                   string `json:"LocalIPAddress,omitempty"`
+	LaunchType                             string `json:"LaunchType,omitempty"`
+	lock                                   sync.RWMutex
+	setIdOnce                              sync.Once
+	ServiceConnectConfig                   *serviceconnect.Config `json:"ServiceConnectConfig,omitempty"`
+	ServiceConnectConnectionDrainingUnsafe bool                   `json:"ServiceConnectConnectionDraining,omitempty"`
+	NetworkMode                            string                 `json:"NetworkMode,omitempty"`
+	IsInternal                             bool                   `json:"IsInternal,omitempty"`
+}

agent/data/task_client.go

@@ -18,6 +18,8 @@ import (
 
 	apitask "github.com/aws/amazon-ecs-agent/agent/api/task"
 	"github.com/aws/amazon-ecs-agent/agent/utils"
+	"github.com/aws/amazon-ecs-agent/agent/version"
+	"github.com/aws/amazon-ecs-agent/ecs-agent/logger"
 
 	"github.com/pkg/errors"
 	bolt "go.etcd.io/bbolt"
@@ -50,7 +52,19 @@ func (c *client) GetTasks() ([]*apitask.Task, error) {
 		bucket := tx.Bucket([]byte(tasksBucketName))
 		return walk(bucket, func(id string, data []byte) error {
 			task := apitask.Task{}
-			if err := json.Unmarshal(data, &task); err != nil {
+			// transform the model before loading it to agent state. this is a noop for now.
+			agentVersionInDB, err := c.GetMetadata(AgentVersionKey)
+			if err != nil {
+				logger.Info(emptyAgentVersionMsg)
+			} else {
+				if c.transformer.IsUpgrade(version.Version, agentVersionInDB) {
+					data, err = c.transformer.TransformTask(agentVersionInDB, data)
+					if err != nil {
+						return err
+					}
+				}
+			}
+			if err = json.Unmarshal(data, &task); err != nil {
 				return err
 			}
 			tasks = append(tasks, &task)

agent/data/transformationfunctions/tasktf.go

@@ -0,0 +1,69 @@
+// Copyright 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 transformationfunctions
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/aws/amazon-ecs-agent/agent/data/models"
+	"github.com/aws/amazon-ecs-agent/ecs-agent/logger"
+	"github.com/aws/amazon-ecs-agent/ecs-agent/modeltransformer"
+)
+
+// RegisterTaskTransformationFunctions calls all registerTaskTransformationFunctions<x_y_z> in ascending order.
+// (from lower threshold version to higher threshold version) thresholdVersion is the version we introduce a breaking change in.
+// All versions below threshold version need to go through that specific transformation function
+func RegisterTaskTransformationFunctions(t *modeltransformer.Transformer) {
+	registerTaskTransformationFunction1_x_0(t)
+}
+
+// registerTaskTransformationFunction1_x_0 is a template RegisterTaskTransformation function.
+// It registers the transformation functions that translate the task model from models.Task_1_0_0 to models.Task_1_x_0
+// Future addition to transformation functions should follow the same pattern. This current performs noop
+// TODO: edit this function when introducing first actual transformation function, and add unit test
+func registerTaskTransformationFunction1_x_0(t *modeltransformer.Transformer) {
+	thresholdVersion := "1.0.0" // this assures it never actually gets executed
+	t.AddTaskTransformationFunctions(thresholdVersion, func(dataIn []byte) ([]byte, error) {
+		logger.Info(fmt.Sprintf("Executing transformation function with threshold %s.", thresholdVersion))
+		oldModel := models.Task_1_0_0{}
+		newModel := models.Task_1_x_0{}
+		var intermediate map[string]interface{}
+
+		// Load json to old model (so that we can capture some fields before it is deleted)
+		err := json.Unmarshal(dataIn, &oldModel)
+		if err != nil {
+			return nil, err
+		}
+
+		// Load json to intermediate model to process
+		err = json.Unmarshal(dataIn, &intermediate)
+		if err != nil {
+			return nil, err
+		}
+
+		// Actual process to process
+		delete(intermediate, "ENIs")
+		modifiedJSON, err := json.Marshal(intermediate)
+		if err != nil {
+			return nil, err
+		}
+		err = json.Unmarshal(modifiedJSON, &newModel)
+		newModel.NetworkInterfaces = oldModel.ENIs
+		dataOut, err := json.Marshal(&newModel)
+		logger.Info(fmt.Sprintf("Transform associated with version %s finished.", thresholdVersion))
+		return dataOut, err
+	})
+	logger.Info(fmt.Sprintf("Registered transformation function with threshold %s.", thresholdVersion))
+}

agent/data/transformationfunctions/tasktf_test.go

@@ -0,0 +1,35 @@
+//go:build unit
+// +build unit
+
+// Copyright 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 transformationfunctions
+
+import (
+	"testing"
+
+	"github.com/aws/amazon-ecs-agent/ecs-agent/modeltransformer"
+
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	expectedTaskTransformationChainLength = 1
+)
+
+func TestRegisterTaskTransformationFunctions(t *testing.T) {
+	transformer := modeltransformer.NewTransFormer()
+	RegisterTaskTransformationFunctions(transformer)
+	assert.Equal(t, expectedTaskTransformationChainLength, transformer.GetNumberOfTransformationFunctions("Task"))
+}