feat: Updater rollback

Makefile

@@ -135,7 +135,7 @@ tidy:
 gosec:
 	gosec -exclude-dir updater  ./...
 # exclude the testdata dir; it contains a go program for testing.
-	cd updater; gosec -exclude-dir internal/install/testdata ./...
+	cd updater; gosec -exclude-dir internal/service/testdata ./...
 
 # This target performs all checks that CI will do (excluding the build itself)
 .PHONY: ci-checks

opamp/observiq/observiq_client.go

@@ -81,7 +81,7 @@ func NewClient(args *NewClientArgs) (opamp.Client, error) {
 		downloadableFileManager: newDownloadableFileManager(clientLogger, args.TmpPath),
 		collector:               args.Collector,
 		currentConfig:           args.Config,
-		packagesStateProvider:   newPackagesStateProvider(clientLogger, "package_statuses.json"),
+		packagesStateProvider:   newPackagesStateProvider(clientLogger, packagestate.DefaultFileName),
 	}
 
 	// Parse URL to determin scheme

packagestate/packages_state_manager.go

@@ -28,6 +28,9 @@ import (
 // CollectorPackageName is the name for the top level packages for this collector
 const CollectorPackageName = "observiq-otel-collector"
 
+// DefaultFileName is the default name of the file use to store state
+const DefaultFileName = "package_statuses.json"
+
 // StateManager tracks Package states
 type StateManager interface {
 	// LoadStatuses retrieves the previously saved PackagesStatuses.

updater/cmd/updater/main.go

@@ -15,13 +15,21 @@
 package main
 
 import (
+	"context"
+	"errors"
 	"fmt"
 	"log"
 	"os"
+	"time"
 
+	"github.com/observiq/observiq-otel-collector/packagestate"
 	"github.com/observiq/observiq-otel-collector/updater/internal/install"
+	"github.com/observiq/observiq-otel-collector/updater/internal/rollback"
+	"github.com/observiq/observiq-otel-collector/updater/internal/state"
 	"github.com/observiq/observiq-otel-collector/updater/internal/version"
+	"github.com/open-telemetry/opamp-go/protobufs"
 	"github.com/spf13/pflag"
+	"go.uber.org/zap"
 )
 
 // Unimplemented
@@ -43,12 +51,58 @@ func main() {
 		os.Exit(1)
 	}
 
+	// Create a monitor and load the package status file
+	// TODO replace nop logger with real one
+	monitor, err := state.NewCollectorMonitor(zap.NewNop())
+	if err != nil {
+		log.Fatalln("Failed to create monitor:", err)
+	}
+
 	installer, err := install.NewInstaller(*tmpDir)
 	if err != nil {
 		log.Fatalf("Failed to create installer: %s", err)
 	}
 
-	if err := installer.Install(); err != nil {
-		log.Fatalf("Failed to install: %s", err)
+	rb, err := rollback.NewRollbacker(*tmpDir)
+	if err != nil {
+		log.Fatalf("Failed to create rollbacker: %s", err)
+	}
+
+	if err := rb.Backup(); err != nil {
+		log.Fatalf("Failed to backup: %s", err)
 	}
+
+	if err := installer.Install(rb); err != nil {
+		log.Default().Printf("Failed to install: %s", err)
+
+		// Set the state to failed before rollback so collector knows it failed
+		if setErr := monitor.SetState(packagestate.DefaultFileName, protobufs.PackageStatus_InstallFailed, err); setErr != nil {
+			log.Println("Failed to set state on install failure:", setErr)
+		}
+		rb.Rollback()
+		log.Default().Fatalf("Rollback complete")
+	}
+
+	// Create a context with timeout to wait for a success or failed status
+	checkCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	// Monitor the install state
+	if err := monitor.MonitorForSuccess(checkCtx, packagestate.DefaultFileName); err != nil {
+		log.Println("Failed to install:", err)
+
+		// If this is not an error due to the collector setting a failed status we need to set a failed status
+		if !errors.Is(err, state.ErrFailedStatus) {
+			// Set the state to failed before rollback so collector knows it failed
+			if setErr := monitor.SetState(packagestate.DefaultFileName, protobufs.PackageStatus_InstallFailed, err); setErr != nil {
+				log.Println("Failed to set state on install failure:", setErr)
+			}
+		}
+
+		rb.Rollback()
+		log.Fatalln("Rollback complete")
+	}
+
+	// Successful update
+	log.Println("Update Complete")
 }

updater/go.mod

@@ -4,14 +4,22 @@ go 1.17
 
 require (
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
+	github.com/observiq/observiq-otel-collector/packagestate v0.0.0-00010101000000-000000000000
+	github.com/open-telemetry/opamp-go v0.2.0
 	github.com/spf13/pflag v1.0.5
-	github.com/stretchr/testify v1.7.2
-	golang.org/x/sys v0.0.0-20201015000850-e3ed0017c211
+	github.com/stretchr/testify v1.8.0
+	go.uber.org/zap v1.21.0
+	golang.org/x/sys v0.0.0-20210510120138-977fb7262007
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/objx v0.1.0 // indirect
+	github.com/stretchr/objx v0.4.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.8.0 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
+
+replace github.com/observiq/observiq-otel-collector/packagestate => ../packagestate

updater/go.sum

@@ -1,19 +1,81 @@
+github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
+github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
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+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
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 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
-github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.7.2 h1:4jaiDzPyXQvSd7D0EjG45355tLlV3VOECpq10pLC+8s=
-github.com/stretchr/testify v1.7.2/go.mod h1:R6va5+xMeoiuVRoj+gSkQ7d3FALtqAAGI1FQKckRals=
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updater/internal/action/action.go

@@ -0,0 +1,21 @@
+// Copyright  observIQ, Inc.
+//
+// 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 action
+
+// RollbackableAction is an interface to represents an install action that may be rolled back.
+//go:generate mockery --name RollbackableAction --filename rollbackable_action.go
+type RollbackableAction interface {
+	Rollback() error
+}

updater/internal/action/file_action.go

@@ -0,0 +1,82 @@
+// Copyright  observIQ, Inc.
+//
+// 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 action
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/observiq/observiq-otel-collector/updater/internal/file"
+	"github.com/observiq/observiq-otel-collector/updater/internal/path"
+)
+
+// CopyFileAction is an action that records a file being copied from FromPath to ToPath
+type CopyFileAction struct {
+	// FromPathRel is the path where the file originated, relative to the "latest"
+	// directory
+	FromPathRel string
+	// ToPath is the path where the file was written.
+	ToPath string
+	// FileCreated is a bool that records whether this action had to create a new file or not
+	FileCreated bool
+	backupDir   string
+	latestDir   string
+}
+
+var _ RollbackableAction = (*CopyFileAction)(nil)
+
+// NewCopyFileAction creates a new CopyFileAction that indicates a file was copied from
+// fromPathRel into toPath. tmpDir is specified for rollback purposes.
+// NOTE: This action MUST be created BEFORE the action actually takes place; This allows
+// for previous existence of the file to be recorded.
+func NewCopyFileAction(fromPathRel, toPath, tmpDir string) (*CopyFileAction, error) {
+	fileExists := true
+	_, err := os.Stat(toPath)
+	switch {
+	case errors.Is(err, os.ErrNotExist):
+		fileExists = false
+	case err != nil:
+		return nil, fmt.Errorf("unexpected error stat-ing file: %w", err)
+	}
+
+	return &CopyFileAction{
+		FromPathRel: fromPathRel,
+		ToPath:      toPath,
+		// The file will be created if it doesn't already exist
+		FileCreated: !fileExists,
+		backupDir:   path.BackupDirFromTempDir(tmpDir),
+		latestDir:   path.LatestDirFromTempDir(tmpDir),
+	}, nil
+}
+
+// Rollback will undo the file copy, by either deleting the file if the file did not originally exist,
+// or it will copy the old file in the rollback dir if it already exists.
+func (c CopyFileAction) Rollback() error {
+	if c.FileCreated {
+		// File did not exist before this action.
+		// We just need to delete this file.
+		return os.RemoveAll(c.ToPath)
+	}
+
+	// join the relative path to the backup directory to get the location of the backup path
+	backupFilePath := filepath.Join(c.backupDir, c.FromPathRel)
+	if err := file.CopyFile(backupFilePath, c.ToPath, true); err != nil {
+		return fmt.Errorf("failed to copy file: %w", err)
+	}
+
+	return nil
+}