emissary/internal/agent/controller/app/controller.go

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package app
import (
"context"
"io"
"net/http"
"os"
"path/filepath"
"forge.cadoles.com/Cadoles/emissary/internal/agent"
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"forge.cadoles.com/Cadoles/emissary/internal/agent/controller/app/spec"
"forge.cadoles.com/arcad/edge/pkg/bundle"
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"github.com/mitchellh/hashstructure/v2"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/logger"
)
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type serverEntry struct {
AppDefHash uint64
Server *Server
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}
type Controller struct {
client *http.Client
downloadDir string
dataDir string
servers map[string]*serverEntry
appRepository *AppRepository
}
// Name implements node.Controller.
func (c *Controller) Name() string {
return "app-controller"
}
// Reconcile implements node.Controller.
func (c *Controller) Reconcile(ctx context.Context, state *agent.State) error {
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appSpec := spec.NewSpec()
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if err := state.GetSpec(spec.Name, appSpec); err != nil {
if errors.Is(err, agent.ErrSpecNotFound) {
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logger.Info(ctx, "could not find app spec")
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c.stopAllApps(ctx, appSpec)
return nil
}
return errors.WithStack(err)
}
logger.Info(ctx, "retrieved spec", logger.F("spec", appSpec.SpecName()), logger.F("revision", appSpec.SpecRevision()))
c.updateApps(ctx, appSpec)
return nil
}
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func (c *Controller) stopAllApps(ctx context.Context, spec *spec.Spec) {
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if len(c.servers) > 0 {
logger.Info(ctx, "stopping all apps")
}
for appID, entry := range c.servers {
logger.Info(ctx, "stopping app", logger.F("appID", appID))
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if err := entry.Server.Stop(); err != nil {
logger.Error(
ctx, "error while stopping app",
logger.F("appID", appID),
logger.E(errors.WithStack(err)),
)
delete(c.servers, appID)
}
}
}
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func (c *Controller) updateApps(ctx context.Context, specs *spec.Spec) {
// Stop and remove obsolete apps
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for appKey, server := range c.servers {
if _, exists := specs.Apps[appKey]; exists {
continue
}
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logger.Info(ctx, "stopping app", logger.F("appKey", appKey))
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if err := server.Server.Stop(); err != nil {
logger.Error(
ctx, "error while stopping app",
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logger.F("appKey", appKey),
logger.E(errors.WithStack(err)),
)
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delete(c.servers, appKey)
}
}
if err := c.updateAppRepository(ctx, specs); err != nil {
logger.Error(
ctx, "could not update app repository",
logger.E(errors.WithStack(err)),
)
return
}
// (Re)start apps if necessary
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for appKey := range specs.Apps {
appCtx := logger.With(ctx, logger.F("appKey", appKey))
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if err := c.updateApp(ctx, specs, appKey); err != nil {
logger.Error(appCtx, "could not update app", logger.E(errors.WithStack(err)))
continue
}
}
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}
func (c *Controller) updateAppRepository(ctx context.Context, specs *spec.Spec) error {
bundles := make([]string, 0, len(specs.Apps))
for appKey, app := range specs.Apps {
path := c.getAppBundlePath(appKey, app.Format)
bundles = append(bundles, path)
}
resolveAppURL, err := createResolveAppURL(specs)
if err != nil {
return errors.WithStack(err)
}
c.appRepository.Update(resolveAppURL, bundles)
return nil
}
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func (c *Controller) updateApp(ctx context.Context, specs *spec.Spec, appKey string) (err error) {
appEntry := specs.Apps[appKey]
appDef := struct {
App spec.AppEntry
Config *spec.Config
}{
App: appEntry,
Config: specs.Config,
}
newAppDefHash, err := hashstructure.Hash(appDef, hashstructure.FormatV2, nil)
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if err != nil {
return errors.WithStack(err)
}
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bundle, sha256sum, err := c.ensureAppBundle(ctx, appKey, appEntry)
if err != nil {
return errors.Wrap(err, "could not download app bundle")
}
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server, exists := c.servers[appKey]
if !exists {
logger.Info(ctx, "app currently not running")
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} else if sha256sum != appEntry.SHA256Sum {
logger.Info(
ctx, "bundle hash mismatch, stopping app",
logger.F("currentHash", sha256sum),
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logger.F("specHash", appEntry.SHA256Sum),
)
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if err := server.Server.Stop(); err != nil {
return errors.Wrap(err, "could not stop app")
}
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server = nil
}
newServerEntry := func() (*serverEntry, error) {
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options, err := c.getHandlerOptions(ctx, appKey, specs)
if err != nil {
return nil, errors.Wrap(err, "could not create handler options")
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}
server = &serverEntry{
Server: NewServer(bundle, specs.Config, options...),
AppDefHash: 0,
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}
return server, nil
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}
if server == nil {
serverEntry, err := newServerEntry()
if err != nil {
return errors.WithStack(err)
}
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c.servers[appKey] = serverEntry
}
defChanged := newAppDefHash != server.AppDefHash
if server.Server.Running() && !defChanged {
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return nil
}
if defChanged && server.AppDefHash != 0 {
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logger.Info(
ctx, "restarting app",
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logger.F("address", appEntry.Address),
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)
if err := server.Server.Stop(); err != nil {
return errors.WithStack(err)
}
serverEntry, err := newServerEntry()
if err != nil {
return errors.WithStack(err)
}
c.servers[appKey] = serverEntry
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} else {
logger.Info(
ctx, "starting app",
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logger.F("address", appEntry.Address),
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)
}
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if err := server.Server.Start(ctx, appEntry.Address); err != nil {
delete(c.servers, appKey)
return errors.Wrap(err, "could not start app")
}
server.AppDefHash = newAppDefHash
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return nil
}
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func (c *Controller) ensureAppBundle(ctx context.Context, appID string, spec spec.AppEntry) (bundle.Bundle, string, error) {
if err := os.MkdirAll(c.downloadDir, os.ModePerm); err != nil {
return nil, "", errors.WithStack(err)
}
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bundlePath := c.getAppBundlePath(appID, spec.Format)
_, err := os.Stat(bundlePath)
if err != nil && !errors.Is(err, os.ErrNotExist) {
return nil, "", errors.WithStack(err)
}
if errors.Is(err, os.ErrNotExist) {
if err := c.downloadFile(spec.URL, spec.SHA256Sum, bundlePath); err != nil {
return nil, "", errors.WithStack(err)
}
}
sha256sum, err := hash(bundlePath)
if err != nil {
return nil, "", errors.WithStack(err)
}
if sha256sum == spec.SHA256Sum {
bdle, err := bundle.FromPath(bundlePath)
if err != nil {
return nil, "", errors.WithStack(err)
}
return bdle, sha256sum, nil
}
logger.Info(ctx, "bundle hash mismatch, downloading app", logger.F("url", spec.URL))
if err := c.downloadFile(spec.URL, spec.SHA256Sum, bundlePath); err != nil {
return nil, "", errors.WithStack(err)
}
bdle, err := bundle.FromPath(bundlePath)
if err != nil {
return nil, "", errors.WithStack(err)
}
return bdle, "", nil
}
func (c *Controller) downloadFile(url string, sha256sum string, dest string) error {
res, err := c.client.Get(url)
if err != nil {
return errors.WithStack(err)
}
defer func() {
if err := res.Body.Close(); err != nil && !errors.Is(err, os.ErrClosed) {
panic(errors.WithStack(err))
}
}()
tmp, err := os.CreateTemp(filepath.Dir(dest), "download_")
if err != nil {
return errors.WithStack(err)
}
defer func() {
if err := os.Remove(tmp.Name()); err != nil && !os.IsNotExist(err) {
panic(errors.WithStack(err))
}
}()
if _, err := io.Copy(tmp, res.Body); err != nil {
return errors.WithStack(err)
}
tmpFileHash, err := hash(tmp.Name())
if err != nil {
return errors.WithStack(err)
}
if tmpFileHash != sha256sum {
return errors.Errorf("sha256 sum mismatch: expected '%s', got '%s'", sha256sum, tmpFileHash)
}
if err := os.Rename(tmp.Name(), dest); err != nil {
return errors.WithStack(err)
}
return nil
}
func (c *Controller) ensureAppDataDir(ctx context.Context, appID string) (string, error) {
dataDir := filepath.Join(c.dataDir, appID)
if err := os.MkdirAll(dataDir, os.ModePerm); err != nil {
return "", errors.WithStack(err)
}
return dataDir, nil
}
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func (c *Controller) getAppBundlePath(appKey string, format string) string {
return filepath.Join(c.downloadDir, appKey+"."+format)
}
func NewController(funcs ...OptionFunc) *Controller {
opts := defaultOptions()
for _, fn := range funcs {
fn(opts)
}
return &Controller{
client: opts.Client,
downloadDir: opts.DownloadDir,
dataDir: opts.DataDir,
servers: make(map[string]*serverEntry),
appRepository: NewAppRepository(),
}
}
var _ agent.Controller = &Controller{}