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deployer.go
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deployer.go
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// Copyright 2022 Namespace Labs Inc; 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.
package service
import (
"context"
"encoding/json"
"fmt"
"log"
"os"
"path/filepath"
"sync"
"time"
"github.com/hpcloud/tail"
spb "google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
"namespacelabs.dev/foundation/framework/kubernetes/kubedef"
"namespacelabs.dev/foundation/framework/rpcerrors"
"namespacelabs.dev/foundation/internal/executor"
"namespacelabs.dev/foundation/internal/protos"
"namespacelabs.dev/foundation/internal/runtime"
o "namespacelabs.dev/foundation/orchestration"
orchpb "namespacelabs.dev/foundation/orchestration/proto"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/schema/orchestration"
"namespacelabs.dev/foundation/std/cfg"
"namespacelabs.dev/foundation/std/execution"
"namespacelabs.dev/foundation/std/tasks"
"namespacelabs.dev/foundation/std/tasks/protolog"
"namespacelabs.dev/go-ids"
)
const (
tasksJsonFile = "tasks.json"
)
type deployer struct {
statusDir string
leaser *leaser
}
type TaskEventEntry struct {
Done bool `json:"done,omitempty"`
Timestamp time.Time `json:"timestamp,omitempty"`
Error *spb.Status `json:"error,omitempty"`
Log *serializedMessage[*protolog.Log] `json:"log,omitempty"`
Event *serializedMessage[*orchestration.Event] `json:"event,omitempty"`
}
type serializedMessage[V proto.Message] struct {
Actual V
}
var _ json.Marshaler = &serializedMessage[proto.Message]{}
var _ json.Unmarshaler = &serializedMessage[proto.Message]{}
func newDeployer() *deployer {
statusDir := filepath.Join(os.Getenv("NSDATA"), "status")
if err := os.MkdirAll(statusDir, 0700|os.ModeDir); err != nil {
log.Fatalf("unable to create dir %s: %v", statusDir, err)
}
return &deployer{
statusDir: statusDir,
leaser: newLeaser(),
}
}
type RunningDeployment struct {
ID string
}
func (d *deployer) Schedule(deployPlan *schema.DeployPlan, env cfg.Context, arrival time.Time) (*RunningDeployment, error) {
id := ids.NewRandomBase32ID(16)
plan := execution.NewPlan(deployPlan.GetProgram().GetInvocation()...)
dir := filepath.Join(d.statusDir, id)
if err := os.MkdirAll(dir, 0700); err != nil {
return nil, fmt.Errorf("unable to create dir %s: %w", dir, err)
}
taskPath := filepath.Join(dir, tasksJsonFile)
taskFile, err := os.OpenFile(taskPath, os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return nil, err
}
of := &eventFile{out: taskFile}
go func() {
defer func() {
if err := taskFile.Close(); err != nil {
log.Printf("failed to close task file: %v", err)
}
}()
// Use server context to not propagate context cancellation
err := d.executeWithLog(context.Background(), of, plan, env, arrival)
status := status.Convert(err)
finalEvent := TaskEventEntry{
Timestamp: time.Now(),
Done: true,
Error: status.Proto(),
}
if err := of.writeEvent(finalEvent); err != nil {
log.Printf("failed to finalize task file: %v", err)
}
// TODO schedule deletion of event file to bound the disk usage once we use orchestrator again for deployments
}()
return &RunningDeployment{ID: id}, nil
}
func (d *deployer) executeWithLog(ctx context.Context, out *eventFile, plan *execution.Plan, env cfg.Context, arrival time.Time) error {
eg := executor.New(ctx, "orchestrator.executeWithLog")
ch := make(chan *protolog.Log)
eg.Go(func(ctx context.Context) error {
sink := protolog.NewSink(ch)
defer sink.Close()
return d.execute(tasks.WithSink(ctx, sink), out, plan, env, arrival)
})
eg.Go(func(ctx context.Context) error {
return logProtos(out, ch, func(log *protolog.Log) TaskEventEntry {
return TaskEventEntry{Log: &serializedMessage[*protolog.Log]{Actual: log}}
})
})
return eg.Wait()
}
func (d *deployer) execute(ctx context.Context, out *eventFile, plan *execution.Plan, env cfg.Context, arrival time.Time) error {
cluster, err := runtime.NamespaceFor(ctx, env)
if err != nil {
return err
}
k8s, ok := cluster.(kubedef.KubeClusterNamespace)
var releaseLease func()
if env.Environment().Purpose != schema.Environment_DEVELOPMENT && ok {
// For non-dev environments, we only allow one ongoing deployment per namespace to improve robustness.
// For dev environments, we do allow concurrent deployments to not slow down edit-refesh cycles.
releaseLease, err = d.leaser.acquireLease(k8s.KubeConfig().Namespace, arrival)
if err != nil {
if err == errDeployPlanTooOld {
// We already finished a later deployment -> skip this one.
return nil
}
return err
}
}
if releaseLease != nil {
defer releaseLease()
}
return execution.ExecuteExt(ctx, "deployment.execute", plan, func(ctx context.Context) (chan *orchestration.Event, func(context.Context) error) {
ch := make(chan *orchestration.Event)
errCh := make(chan error)
go func() {
errCh <- logProtos(out, ch, func(ev *orchestration.Event) TaskEventEntry {
return TaskEventEntry{Event: &serializedMessage[*orchestration.Event]{Actual: ev}}
})
}()
return ch, func(_ context.Context) error {
return <-errCh // Wait for the logging go-routine to return.
}
}, o.ExecuteOpts(), execution.FromContext(env), runtime.InjectCluster(cluster))
}
func (d *deployer) Status(ctx context.Context, id string, loglevel int32, notify func(*orchpb.DeploymentStatusResponse) error) error {
dir := filepath.Join(d.statusDir, id)
if _, err := os.Stat(dir); os.IsNotExist(err) {
return fmt.Errorf("unknown deployment id: %s", id)
}
tasks, err := tail.TailFile(filepath.Join(dir, tasksJsonFile), tail.Config{
MustExist: true,
Follow: true,
})
if err != nil {
if os.IsNotExist(err) {
return fmt.Errorf("no task logs found for deployment id: %s", id)
}
return err
}
for {
select {
case <-ctx.Done():
return ctx.Err()
case line := <-tasks.Lines:
ev := &TaskEventEntry{}
if err := json.Unmarshal([]byte(line.Text), ev); err != nil {
return rpcerrors.Errorf(codes.Internal, "failed to unserialize message: %w", err)
}
if ev.Done {
if ev.Error == nil {
return nil
}
return status.FromProto(ev.Error).Err()
}
if ev.Event != nil {
if err := notify(&orchpb.DeploymentStatusResponse{Event: ev.Event.Actual}); err != nil {
return err
}
}
if ev.Log != nil {
log := ev.Log.Actual
if log.LogLevel <= loglevel {
if err := notify(&orchpb.DeploymentStatusResponse{Log: log}); err != nil {
return err
}
}
}
}
}
}
func (sm *serializedMessage[V]) MarshalJSON() ([]byte, error) {
return protojson.MarshalOptions{UseProtoNames: true}.Marshal(sm.Actual)
}
func (sm *serializedMessage[V]) UnmarshalJSON(data []byte) error {
msg := protos.NewFromType[V]()
if err := protojson.Unmarshal(data, msg); err != nil {
return err
}
sm.Actual = msg
return nil
}
type eventFile struct {
mu sync.Mutex
out *os.File
}
func (of *eventFile) writeEvent(event TaskEventEntry) error {
data, err := json.Marshal(event)
if err != nil {
return err
}
// Serialize all file writes.
of.mu.Lock()
defer of.mu.Unlock()
if _, err := fmt.Fprintf(of.out, "%s\n", data); err != nil {
return err
}
if err := of.out.Sync(); err != nil {
return err
}
return nil
}
func logProtos[V proto.Message](w *eventFile, ch chan V, makeEvent func(V) TaskEventEntry) error {
for ev := range ch {
event := makeEvent(ev)
event.Timestamp = time.Now()
if err := w.writeEvent(event); err != nil {
// Drain the channel.
for ev := range ch {
log.Print("Dropped event:", ev)
}
return err
}
}
return nil
}