controller: Convert the deployer to a generic worker

bootstrap/manifest_template.json

@@ -99,8 +99,8 @@
           "service": "flynn-controller-scheduler",
           "resurrect": true
         },
-        "deployer": {
-          "cmd": ["deployer"]
+        "worker": {
+          "cmd": ["worker"]
         }
       }
     },
@@ -150,7 +150,7 @@
     "app_step": "controller-inception",
     "processes": {
       "scheduler": 1,
-      "deployer": 2,
+      "worker": 2,
       "web": 2
     }
   },

controller/Dockerfile

@@ -2,7 +2,7 @@ FROM flynn/busybox
 
 ADD bin/flynn-controller /bin/flynn-controller
 ADD bin/flynn-scheduler /bin/flynn-scheduler
-ADD bin/flynn-deployer /bin/flynn-deployer
+ADD bin/flynn-worker /bin/flynn-worker
 ADD start.sh /bin/start-flynn-controller
 ADD bin/jsonschema /etc/flynn-controller/jsonschema
 

controller/Tupfile

@@ -1,7 +1,7 @@
 include_rules
 : |> !go |> bin/flynn-controller
 : |> !go ./scheduler |> bin/flynn-scheduler
-: |> !go ./deployer |> bin/flynn-deployer
+: |> !go ./worker |> bin/flynn-worker
 : foreach $(ROOT)/schema/*.json |> !cp |> bin/jsonschema/%g.json
 : foreach $(ROOT)/schema/controller/*.json |> !cp |> bin/jsonschema/controller/%g.json
 : foreach $(ROOT)/schema/router/*.json |> !cp |> bin/jsonschema/router/%g.json

controller/start.sh

@@ -3,9 +3,9 @@
 case $1 in
   controller) exec /bin/flynn-controller ;;
   scheduler)  exec /bin/flynn-scheduler ;;
-  deployer)  exec /bin/flynn-deployer ;;
+  worker)  exec /bin/flynn-worker ;;
   *)
-    echo "Usage: $0 {controller|scheduler|deployer}"
+    echo "Usage: $0 {controller|scheduler|worker}"
     exit 2
     ;;
 esac

controller/deployer/strategies/all-at-once.go → controller/worker/deployment/all_at_once.go

@@ -1,9 +1,9 @@
-package strategy
+package deployment
 
 import ct "github.com/flynn/flynn/controller/types"
 
-func allAtOnce(d *Deploy) error {
-	log := d.logger.New("fn", "allAtOnce")
+func (d *DeployJob) deployAllAtOnce() error {
+	log := d.logger.New("fn", "deployAllAtOnce")
 	log.Info("starting all-at-once deployment")
 
 	expected := make(jobEvents)

controller/deployer/main.go → controller/worker/deployment/context.go

@@ -1,78 +1,31 @@
-package main
+package deployment
 
 import (
 	"encoding/json"
-	"os"
 	"time"
 
 	"github.com/flynn/flynn/Godeps/_workspace/src/github.com/flynn/que-go"
-	"github.com/flynn/flynn/Godeps/_workspace/src/github.com/jackc/pgx"
 	"github.com/flynn/flynn/Godeps/_workspace/src/gopkg.in/inconshreveable/log15.v2"
 	"github.com/flynn/flynn/controller/client"
-	"github.com/flynn/flynn/controller/deployer/strategies"
 	ct "github.com/flynn/flynn/controller/types"
+	"github.com/flynn/flynn/discoverd/client"
 	"github.com/flynn/flynn/pkg/attempt"
 	"github.com/flynn/flynn/pkg/postgres"
-	"github.com/flynn/flynn/pkg/shutdown"
 )
 
 type context struct {
 	db     *postgres.DB
 	client *controller.Client
+	logger log15.Logger
 }
 
-const workerCount = 10
-
-var logger = log15.New("app", "deployer")
-
-func main() {
-	log := logger.New("fn", "main")
-
-	log.Info("creating controller client")
-	client, err := controller.NewClient("", os.Getenv("AUTH_KEY"))
-	if err != nil {
-		log.Error("error creating controller client", "err", err)
-		shutdown.Fatal()
-	}
-
-	log.Info("connecting to postgres")
-	db := postgres.Wait("", "")
-
-	log.Info("creating postgres connection pool")
-	pgxpool, err := pgx.NewConnPool(pgx.ConnPoolConfig{
-		ConnConfig: pgx.ConnConfig{
-			Host:     os.Getenv("PGHOST"),
-			User:     os.Getenv("PGUSER"),
-			Password: os.Getenv("PGPASSWORD"),
-			Database: os.Getenv("PGDATABASE"),
-		},
-		AfterConnect:   que.PrepareStatements,
-		MaxConnections: workerCount,
-	})
-	if err != nil {
-		log.Error("error creating postgres connection pool", "err", err)
-		shutdown.Fatal()
-	}
-	shutdown.BeforeExit(func() { pgxpool.Close() })
-
-	ctx := context{db: db, client: client}
-	workers := que.NewWorkerPool(
-		que.NewClient(pgxpool),
-		que.WorkMap{"deployment": ctx.HandleJob},
-		workerCount,
-	)
-	workers.Interval = 5 * time.Second
-
-	log.Info("starting workers", "count", workerCount, "interval", workers.Interval)
-	go workers.Start()
-	shutdown.BeforeExit(func() { workers.Shutdown() })
-
-	<-make(chan bool) // block and keep running
+func JobHandler(db *postgres.DB, client *controller.Client, logger log15.Logger) func(*que.Job) error {
+	return (&context{db, client, logger}).HandleDeployment
 }
 
-func (c *context) HandleJob(job *que.Job) (e error) {
-	log := logger.New("fn", "HandleJob")
-	log.Info("handling job", "id", job.ID, "error_count", job.ErrorCount)
+func (c *context) HandleDeployment(job *que.Job) (e error) {
+	log := c.logger.New("fn", "HandleDeployment")
+	log.Info("handling deployment", "job_id", job.ID, "error_count", job.ErrorCount)
 
 	var args ct.DeployID
 	if err := json.Unmarshal(job.Args, &args); err != nil {
@@ -122,7 +75,7 @@ func (c *context) HandleJob(job *que.Job) (e error) {
 		// rollback failed deploy
 		if e != nil {
 			errMsg := e.Error()
-			if !strategy.IsSkipRollback(e) {
+			if !IsSkipRollback(e) {
 				log.Warn("rolling back deployment due to error", "err", e)
 				e = c.rollback(log, deployment, f)
 			}
@@ -133,8 +86,22 @@ func (c *context) HandleJob(job *que.Job) (e error) {
 			}
 		}
 	}()
+
+	j := &DeployJob{
+		Deployment:      deployment,
+		client:          c.client,
+		deployEvents:    events,
+		serviceEvents:   make(chan *discoverd.Event),
+		useJobEvents:    make(map[string]struct{}),
+		logger:          c.logger,
+		oldReleaseState: make(map[string]int, len(deployment.Processes)),
+		newReleaseState: make(map[string]int, len(deployment.Processes)),
+		knownJobStates:  make(map[jobIDState]struct{}),
+		omni:            make(map[string]struct{}),
+	}
+
 	log.Info("performing deployment")
-	if err := strategy.Perform(deployment, c.client, events, logger); err != nil {
+	if err := j.Perform(); err != nil {
 		log.Error("error performing deployment", "err", err)
 		return err
 	}

controller/worker/deployment/errors.go

@@ -0,0 +1,24 @@
+package deployment
+
+import "fmt"
+
+type ErrSkipRollback struct {
+	Err string
+}
+
+func (e ErrSkipRollback) Error() string {
+	return e.Err
+}
+
+func IsSkipRollback(err error) bool {
+	_, ok := err.(ErrSkipRollback)
+	return ok
+}
+
+type UnknownStrategyError struct {
+	Strategy string
+}
+
+func (e UnknownStrategyError) Error() string {
+	return fmt.Sprintf("deployment: unknown strategy %q", e.Strategy)
+}