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detector.go
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detector.go
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// Copyright 2022 The PipeCD 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.
package cloudrun
import (
"context"
"fmt"
"os"
"path/filepath"
"strings"
"time"
"go.uber.org/zap"
"github.com/pipe-cd/pipecd/pkg/app/piped/livestatestore/cloudrun"
provider "github.com/pipe-cd/pipecd/pkg/app/piped/platformprovider/cloudrun"
"github.com/pipe-cd/pipecd/pkg/app/piped/sourcedecrypter"
"github.com/pipe-cd/pipecd/pkg/cache"
"github.com/pipe-cd/pipecd/pkg/config"
"github.com/pipe-cd/pipecd/pkg/diff"
"github.com/pipe-cd/pipecd/pkg/git"
"github.com/pipe-cd/pipecd/pkg/model"
)
type applicationLister interface {
ListByPlatformProvider(name string) []*model.Application
}
type gitClient interface {
Clone(ctx context.Context, repoID, remote, branch, destination string) (git.Repo, error)
}
type secretDecrypter interface {
Decrypt(string) (string, error)
}
type reporter interface {
ReportApplicationSyncState(ctx context.Context, appID string, state model.ApplicationSyncState) error
}
type Detector interface {
Run(ctx context.Context) error
ProviderName() string
}
type detector struct {
provider config.PipedPlatformProvider
appLister applicationLister
gitClient gitClient
stateGetter cloudrun.Getter
reporter reporter
appManifestsCache cache.Cache
interval time.Duration
config *config.PipedSpec
secretDecrypter secretDecrypter
logger *zap.Logger
gitRepos map[string]git.Repo
}
func NewDetector(
cp config.PipedPlatformProvider,
appLister applicationLister,
gitClient gitClient,
stateGetter cloudrun.Getter,
reporter reporter,
appManifestsCache cache.Cache,
cfg *config.PipedSpec,
sd secretDecrypter,
logger *zap.Logger,
) Detector {
logger = logger.Named("cloudrun-detector").With(
zap.String("cloud-provider", cp.Name),
)
return &detector{
provider: cp,
appLister: appLister,
gitClient: gitClient,
stateGetter: stateGetter,
reporter: reporter,
appManifestsCache: appManifestsCache,
interval: time.Minute,
config: cfg,
secretDecrypter: sd,
gitRepos: make(map[string]git.Repo),
logger: logger,
}
}
func (d *detector) Run(ctx context.Context) error {
d.logger.Info("start running drift detector for cloudrun applications")
ticker := time.NewTicker(d.interval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
d.logger.Info("drift detector for cloudrun applications has been stopped")
return nil
case <-ticker.C:
d.check(ctx)
}
}
}
func (d *detector) ProviderName() string {
return d.provider.Name
}
func (d *detector) check(ctx context.Context) error {
appsByRepo := d.listGroupedApplication()
for repoID, apps := range appsByRepo {
gitRepo, ok := d.gitRepos[repoID]
if !ok {
// Clone repository for the first time.
gr, err := d.cloneGitRepository(ctx, repoID)
if err != nil {
d.logger.Error("failed to clone git repository",
zap.String("repo-id", repoID),
zap.Error(err),
)
continue
}
gitRepo = gr
d.gitRepos[repoID] = gitRepo
}
// Fetch the latest commit to compare the states.
branch := gitRepo.GetClonedBranch()
if err := gitRepo.Pull(ctx, branch); err != nil {
d.logger.Error("failed to pull repository branch",
zap.String("repo-id", repoID),
zap.Error(err),
)
continue
}
// Get the head commit of the repository.
headCommit, err := gitRepo.GetLatestCommit(ctx)
if err != nil {
d.logger.Error("failed to get head commit hash",
zap.String("repo-id", repoID),
zap.Error(err),
)
continue
}
// Start checking all applications in this repository.
for _, app := range apps {
if err := d.checkApplication(ctx, app, gitRepo, headCommit); err != nil {
d.logger.Error(fmt.Sprintf("failed to check application: %s", app.Id), zap.Error(err))
}
}
}
return nil
}
func (d *detector) cloneGitRepository(ctx context.Context, repoID string) (git.Repo, error) {
repoCfg, ok := d.config.GetRepository(repoID)
if !ok {
return nil, fmt.Errorf("repository %s was not found in piped configuration", repoID)
}
return d.gitClient.Clone(ctx, repoID, repoCfg.Remote, repoCfg.Branch, "")
}
// listGroupedApplication retrieves all applications those should be handled by this director
// and then groups them by repoID.
func (d *detector) listGroupedApplication() map[string][]*model.Application {
var (
apps = d.appLister.ListByPlatformProvider(d.provider.Name)
m = make(map[string][]*model.Application)
)
for _, app := range apps {
repoID := app.GitPath.Repo.Id
m[repoID] = append(m[repoID], app)
}
return m
}
func (d *detector) checkApplication(ctx context.Context, app *model.Application, repo git.Repo, headCommit git.Commit) error {
headManifest, err := d.loadHeadServiceManifest(app, repo, headCommit)
if err != nil {
return err
}
d.logger.Info(fmt.Sprintf("application %s has a service manifest at commit %s", app.Id, headCommit.Hash))
liveManifest, ok := d.stateGetter.GetServiceManifest(app.Id)
if !ok {
return fmt.Errorf("failed to get live service manifest")
}
d.logger.Info(fmt.Sprintf("application %s has a live service manifest", app.Id))
result, err := provider.Diff(
headManifest,
liveManifest,
diff.WithEquateEmpty(),
diff.WithIgnoreAddingMapKeys(),
diff.WithCompareNumberAndNumericString(),
)
if err != nil {
return err
}
state := makeSyncState(result, headCommit.Hash)
return d.reporter.ReportApplicationSyncState(ctx, app.Id, state)
}
func (d *detector) loadHeadServiceManifest(app *model.Application, repo git.Repo, headCommit git.Commit) (provider.ServiceManifest, error) {
var (
manifestCache = provider.ServiceManifestCache{
AppID: app.Id,
Cache: d.appManifestsCache,
Logger: d.logger,
}
repoDir = repo.GetPath()
appDir = filepath.Join(repoDir, app.GitPath.Path)
)
manifest, ok := manifestCache.Get(headCommit.Hash)
if !ok {
// When the manifests were not in the cache we have to load them.
cfg, err := d.loadApplicationConfiguration(repoDir, app)
if err != nil {
return provider.ServiceManifest{}, fmt.Errorf("failed to load application configuration: %w", err)
}
gds, ok := cfg.GetGenericApplication()
if !ok {
return provider.ServiceManifest{}, fmt.Errorf("unsupport application kind %s", cfg.Kind)
}
if d.secretDecrypter != nil && gds.Encryption != nil {
// We have to copy repository into another directory because
// decrypting the sealed secrets might change the git repository.
dir, err := os.MkdirTemp("", "detector-git-decrypt")
if err != nil {
return provider.ServiceManifest{}, fmt.Errorf("failed to prepare a temporary directory for git repository (%w)", err)
}
defer os.RemoveAll(dir)
repo, err = repo.Copy(filepath.Join(dir, "repo"))
if err != nil {
return provider.ServiceManifest{}, fmt.Errorf("failed to copy the cloned git repository (%w)", err)
}
repoDir := repo.GetPath()
appDir = filepath.Join(repoDir, app.GitPath.Path)
if err := sourcedecrypter.DecryptSecrets(appDir, *gds.Encryption, d.secretDecrypter); err != nil {
return provider.ServiceManifest{}, fmt.Errorf("failed to decrypt secrets (%w)", err)
}
}
var manifestFile string
if cfg.CloudRunApplicationSpec != nil {
manifestFile = cfg.CloudRunApplicationSpec.Input.ServiceManifestFile
}
manifest, err = provider.LoadServiceManifest(appDir, manifestFile)
if err != nil {
return provider.ServiceManifest{}, fmt.Errorf("failed to load new service manifest: %w", err)
}
manifestCache.Put(headCommit.Hash, manifest)
}
return manifest, nil
}
func (d *detector) loadApplicationConfiguration(repoPath string, app *model.Application) (*config.Config, error) {
path := filepath.Join(repoPath, app.GitPath.GetApplicationConfigFilePath())
cfg, err := config.LoadFromYAML(path)
if err != nil {
return nil, err
}
if appKind, ok := cfg.Kind.ToApplicationKind(); !ok || appKind != app.Kind {
return nil, fmt.Errorf("application in application configuration file is not match, got: %s, expected: %s", appKind, app.Kind)
}
return cfg, nil
}
func makeSyncState(r *provider.DiffResult, commit string) model.ApplicationSyncState {
if r.NoChange() {
return model.ApplicationSyncState{
Status: model.ApplicationSyncStatus_SYNCED,
Timestamp: time.Now().Unix(),
}
}
shortReason := fmt.Sprintf("The service manifest doesn't be synced")
if len(commit) >= 7 {
commit = commit[:7]
}
var b strings.Builder
b.WriteString(fmt.Sprintf("Diff between the defined state in Git at commit %s and actual live state:\n\n", commit))
b.WriteString("--- Expected\n+++ Actual\n\n")
details := r.Render(provider.DiffRenderOptions{
// Currently, we do not use the diff command to render the result
// because CloudRun adds a large number of default values to the
// running manifest that causes a wrong diff text.
UseDiffCommand: false,
})
b.WriteString(details)
return model.ApplicationSyncState{
Status: model.ApplicationSyncStatus_OUT_OF_SYNC,
ShortReason: shortReason,
Reason: b.String(),
Timestamp: time.Now().Unix(),
}
}