Use spf13/viper to load the configuration.

cmd/coord/conn.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/json"
+	"fmt"
 
 	"github.com/nats-io/stan.go"
 
@@ -11,24 +12,78 @@ import (
 type (
 	Conn struct {
 		stan.Conn
-		Subject string
+		log.Logger
+	}
+
+	eventUnion struct {
+		Started *StartedEvent
+		Ended   *EndedEvent
+		Error   *ErroredEvent
 	}
 )
 
-func NewConn(clusterID string, clientId string, url string, subject string) (*Conn, error) {
+func NewConn(clusterID string, clientId string, url string) (*Conn, error) {
+	logger := log.DefaultLogger.WithField("conn", fmt.Sprintf("%s[%s]", url, clusterID))
+
+	logger.Debugf("connecting as %q", url, clusterID, clientId)
 	conn, err := stan.Connect(clusterID, clientId, stan.NatsURL(url))
 	if err != nil {
 		return nil, err
 	}
-	log.Debugf("connected to %s as %s", conn.NatsConn().ConnectedUrl(), clientId)
+	logger.Infof("connected as %q", conn.NatsConn().ConnectedUrl(), clusterID, clientId)
 
-	return &Conn{conn, subject}, nil
+	return &Conn{conn, logger}, nil
 }
 
-func (c *Conn) Send(message interface{}) error {
-	bytes, err := json.Marshal(message);
-	if err != nil {
+func (c *Conn) Send(subject string, event Event) error {
+	logger := c.Logger.WithField("channel", subject)
+
+	var data eventUnion
+	switch concreteEvent := event.(type) {
+	case StartedEvent:
+		data.Started = &concreteEvent
+	case EndedEvent:
+		data.Ended = &concreteEvent
+	case ErroredEvent:
+		data.Error = &concreteEvent
+	default:
+		return fmt.Errorf("cannot send %#v", event)
+	}
+
+	if bytes, err := json.Marshal(data); err != nil {
+		return err
+	} else if err := c.Conn.Publish(subject, bytes); err != nil {
 		return err
 	}
-	return c.Conn.Publish(c.Subject, bytes)
+	logger.Debugf("sent event %s", event)
+	return nil
+}
+
+func (c *Conn) Subscribe(subject string, handler func(event Event), opts ...stan.SubscriptionOption) (stan.Subscription, error) {
+	logger := c.Logger.WithField("channel", subject)
+
+	stanHandler := func(msg *stan.Msg) {
+		var data eventUnion
+		if err := json.Unmarshal(msg.Data, &data); err != nil {
+			logger.Errorf("could not unmarshal data `%s`: %s", msg.Data, err)
+			return
+		}
+
+		var event Event
+		if data.Started != nil {
+			event = *data.Started
+		} else if data.Ended != nil {
+			event = *data.Ended
+		} else if data.Error != nil {
+			event = *data.Error
+		} else {
+			logger.Errorf("cannot handle %#v", data)
+			return
+		}
+
+		logger.Debugf("received event: %s", event)
+		handler(event)
+	}
+
+	return c.Conn.Subscribe(subject, stanHandler, opts...)
 }

cmd/coord/main.go

@@ -2,56 +2,60 @@ package main
 
 import (
 	"crypto/sha1"
-	"encoding/json"
 	"fmt"
+	"io"
 	"os"
+	"path/filepath"
 	"strings"
 	"sync"
 
-	"github.com/mkideal/cli"
 	"github.com/nats-io/nats.go"
 	"github.com/nats-io/stan.go"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
 
 	"gitlab.irstea.fr/guillaume.perreal/coord/lib/log"
 )
 
-type (
-	Config struct {
-		ServerURL string   `cli:"s,server" usage:"URL of the NATS server" dft:"$NATS_URL"`
-		ClusterID string   `cli:"c,clusterID" usage:"Cluster ID of the NATS Streaming server" dft:"$NATS_CLUSTER_ID"`
-		Subject   string   `cli:"S,subject" usage:"Reporting subject"`
-		Wait      []string `cli:"w,wait" usage:"wait for a success event on given channel before starting the command"`
-		Durable   string   `cli:"n,name" usage:"persistent client name for event replay"`
-		cli.Helper
+func main() {
+	if err := Run(); err != nil {
+		log.Critical(err.Error())
+		os.Exit(1)
 	}
+}
 
-	StartedEvent struct {
-		Command []string
-		PID     int
-	}
+func Run() error {
+	pflag.StringP("url", "u", nats.DefaultURL, "URL of the NATS server")
+	pflag.StringP("clusterID", "c", "COORD", "Cluster ID of the NATS Streaming server")
+	pflag.StringP("commandID", "i", "", "Identifier of this command")
+	pflag.StringSliceP("wait", "w", nil, "Command ID to wait for")
+	pflag.StringP("durable", "d", "", "persistent identifier for replay")
+	pflag.Parse()
 
-	TerminatedEvent struct {
-		PID      int
-		Success  bool
-		ExitCode int
-		Comment  string
+	if err := viper.BindPFlags(pflag.CommandLine); err != nil {
+		return err
 	}
 
-	ErrorEvent struct {
-		Error error
+	viper.SetEnvPrefix("coord")
+	viper.AutomaticEnv()
+
+	viper.SetConfigName(".coord")
+	viper.AddConfigPath(".")
+	if xdgConfig := os.Getenv("XDG_CONFIG_HOME"); xdgConfig != "" {
+		viper.AddConfigPath(xdgConfig)
+	} else if home, err := os.UserHomeDir(); err == nil {
+		viper.AddConfigPath(filepath.Join(home, ".config"))
 	}
-)
 
-func main() {
-	config := Config{
-		ServerURL: nats.DefaultURL,
-		ClusterID: "https://gitlab.irstea.fr/guillaume.perreal/coord",
+	if err := viper.ReadInConfig(); err != nil {
+		if _, notFound := err.(viper.ConfigFileNotFoundError); notFound {
+			log.Info(err.Error())
+		} else {
+			return err
+		}
 	}
-	os.Exit(cli.Run(&config, Run))
-}
 
-func Run(ctx *cli.Context) error {
-	cmd, err := NewCommand(ctx.Args())
+	cmd, err := NewCommand(pflag.Args())
 	if err != nil {
 		return err
 	}
@@ -63,84 +67,135 @@ func Run(ctx *cli.Context) error {
 
 	hash := sha1.New()
 	hash.Write([]byte(strings.Join(cmd.Args, " ")))
-	clientId := fmt.Sprintf("coord-%x", hash.Sum([]byte(hostname)))
+	defaultCommandID := fmt.Sprintf("coord.cmd.%x", hash.Sum(nil)[:8]);
 
-	config := ctx.Argv().(*Config)
-	if config.Subject == "" {
-		config.Subject = fmt.Sprintf("coord.cmd.%x", hash.Sum(nil))
-	}
+	hash.Write([]byte(hostname))
+	defaultClientID := fmt.Sprintf("coord-%x", hash.Sum(nil)[:8])
 
-	conn, err := NewConn(config.ClusterID, clientId, config.ServerURL, config.Subject)
+	viper.SetDefault("commandID", defaultCommandID)
+	viper.SetDefault("durable", defaultClientID)
+
+	log.DefaultLogger = log.DefaultLogger.WithField("id", viper.GetString("commandID"))
+
+	conn, err := NewConn(
+		viper.GetString("clusterID"),
+		viper.GetString("durable"),
+		viper.GetString("url"),
+	)
 	if err != nil {
 		return err
 	}
-	defer conn.Close()
+	defer CloseLog(conn)
 
-	var opts []stan.SubscriptionOption
-	if config.Durable == "" {
-		opts = append(opts, stan.DurableName(clientId))
-	} else {
-		opts = append(opts, stan.DurableName(config.Durable))
-	}
+	if waitFor := viper.GetStringSlice("wait"); len(waitFor) > 0 {
+		opts := []stan.SubscriptionOption{
+			stan.DurableName(viper.GetString("durable")),
+		}
 
-	before := sync.WaitGroup{}
-	for _, channel := range config.Wait {
-		if sub, err := waitFor(conn, channel, &before, opts); err != nil {
-			return err
-		} else {
-			defer sub.Close()
+		before := sync.WaitGroup{}
+		for _, subject := range waitFor {
+			subject := subject
+			state := Observe(&Receiver{})
+			defer state.Stop()
+
+			sub, err := conn.Subscribe(subject, func(event Event) {
+				LogError(event.Apply(state))
+			}, opts...)
+
+			if err != nil {
+				return err
+			}
+
+			before.Add(1)
+			defer CloseLog(sub)
+
+			go func() {
+				for value := range state.Values {
+					if st, ok := value.(*Receiver); ok && st.IsSuccess() {
+						log.Debugf("%q succeeded", subject)
+						before.Done()
+						return
+					}
+				}
+			}()
+
+			log.Noticef("waiting for %q to succeed", subject)
 		}
+
+		before.Wait()
 	}
 
-	before.Wait()
+	process := &Emitter{conn, viper.GetString("commandID")}
 
 	err = cmd.Start()
 	if err != nil {
-		_ = conn.Send(ErrorEvent{err})
+		LogError(process.Errored(err))
 	} else {
-		_ = conn.Send(StartedEvent{cmd.Args, cmd.Process.Pid})
+		defer func() {
+			_ = cmd.Process.Kill()
+			_, _ = cmd.Process.Wait()
+		}()
+		LogError(process.Started(cmd.Process.Pid))
 	}
 
 	err = cmd.Wait()
 	if err != nil {
-		_ = conn.Send(ErrorEvent{err})
+		LogError(process.Errored(err))
 	} else {
-		state := cmd.ProcessState
-		_ = conn.Send(TerminatedEvent{state.Pid(), state.Success(), state.ExitCode(), state.String()})
+		LogError(process.Ended(cmd.ProcessState.ExitCode(), cmd.ProcessState.String()))
 	}
 
 	return nil
 }
 
-func waitFor(conn *Conn, channel string, wg *sync.WaitGroup, opts []stan.SubscriptionOption) (sub stan.Subscription, err error) {
-	var once sync.Once
+//
+//func waitFor(conn *Conn, channel string, wg *sync.WaitGroup, opts []stan.SubscriptionOption) (sub stan.Subscription, err error) {
+//	var once sync.Once
+//
+//	sub, err = conn.Subscribe(channel, func(msg *stan.Msg) {
+//		log.Debugf("received message %v", msg)
+//		var event struct {
+//			*StartedEvent
+//			*ErrorEvent
+//			*TerminatedEvent
+//		}
+//		if err := json.Unmarshal(msg.Data, &event); err != nil {
+//			log.Debugf("could not unmarshal to terminated event: %s", msg)
+//			return
+//		}
+//		if event.TerminatedEvent == nil {
+//			return
+//		}
+//		log.Debugf("%s terminated: %v", channel, event)
+//		if event.Success {
+//			once.Do(func() {
+//				log.Debugf("%s succeeded", channel)
+//				wg.Done()
+//			})
+//		}
+//	}, opts...)
+//
+//	if err == nil {
+//		wg.Add(1)
+//	}
+//
+//	return
+//}
+
+func LogError(err error) {
+	if err != nil {
+		log.Notice(err.Error())
+	}
+}
 
-	sub, err = conn.Subscribe(channel, func(msg *stan.Msg) {
-		log.Debugf("received message %v", msg)
-		var event struct {
-			*StartedEvent
-			*ErrorEvent
-			*TerminatedEvent
-		}
-		if err := json.Unmarshal(msg.Data, &event); err != nil {
-			log.Debugf("could not unmarshal to terminated event: %s", msg)
-			return
-		}
-		if event.TerminatedEvent == nil {
-			return
-		}
-		log.Debugf("%s terminated: %v", channel, event)
-		if event.Success {
-			once.Do(func() {
-				log.Debugf("%s succeeded", channel)
-				wg.Done()
-			})
-		}
-	}, opts...)
+func DoLog(f func() error) {
+	LogError(f())
+}
 
-	if err == nil {
-		wg.Add(1)
-	}
+func CloseLog(closer io.Closer) {
+	LogError(closer.Close())
+}
 
-	return
+func Squelch(f func () error) {
+	_ = f()
 }

cmd/coord/model.go

+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+type (
+	ProcessState interface {
+		Started(int) error
+		Ended(int, string) error
+		Errored(error) error
+	}
+
+	Event interface {
+		Apply(ProcessState) error
+	}
+
+	StartedEvent struct {
+		PID int
+	}
+
+	EndedEvent struct {
+		ExitCode    int
+		Description string
+	}
+
+	ErroredEvent struct{
+		Error error
+	}
+
+	Emitter struct {
+		*Conn
+		Subject string
+	}
+
+	Receiver struct {
+		PID      int
+		ExitCode int
+		EndDesc  string
+		Error     error
+	}
+
+	ObservableProcessState struct {
+		ProcessState
+		Values chan ProcessState
+		debouncer *time.Timer
+	}
+)
+
+func (e StartedEvent) String() string {
+	return fmt.Sprintf("{started, pid %d}", e.PID)
+}
+
+func (e StartedEvent) Apply(p ProcessState) error {
+	return p.Started(e.PID)
+}
+
+func (e EndedEvent) Apply(p ProcessState) error {
+	return p.Ended(e.ExitCode, e.Description)
+}
+
+func (e EndedEvent) String() string {
+	return fmt.Sprintf("{ended, %s}", e.Description)
+}
+
+func (e ErroredEvent) Apply(p ProcessState) error {
+	return p.Errored(e.Error)
+}
+
+func (e ErroredEvent) String() string {
+	return fmt.Sprintf("{error, %s}", e.Error)
+}
+
+func (e *Emitter) emit(event Event) error {
+	return e.Conn.Send(e.Subject, event)
+}
+
+func (e *Emitter) Started(PID int) error                 { return e.emit(StartedEvent{PID}) }
+func (e *Emitter) Ended(exitCode int, desc string) error { return e.emit(EndedEvent{exitCode, desc}) }
+func (e *Emitter) Errored(err error) error               { return e.emit(ErroredEvent{err}) }
+
+func (r *Receiver) Started(PID int) error {
+	r.ExitCode = -1
+	r.EndDesc = ""
+	r.PID = PID
+	r.Error = nil
+	return nil
+}
+
+func (r *Receiver) Ended(exitCode int, desc string) error {
+	r.ExitCode = exitCode
+	r.EndDesc = desc
+	r.Error = nil
+	return nil
+}
+
+func (r *Receiver) Errored(err error) error {
+	r.Error = err
+	return nil
+}
+
+func (r *Receiver) HasStarted() bool { return r.PID > 0 }
+func (r *Receiver) HasEnded() bool { return r.HasStarted() && r.EndDesc != "" }
+func (r *Receiver) IsSuccess() bool { return r.HasStarted() && r.ExitCode == 0 }
+
+func Observe(p ProcessState) *ObservableProcessState {
+	return &ObservableProcessState{
+		ProcessState: p,
+		Values: make(chan ProcessState, 5),
+	}
+}
+
+func (o *ObservableProcessState) Started(pid int) error {
+	err := o.ProcessState.Started(pid)
+	if err == nil {
+		o.debounce()
+	}
+	return err
+}
+
+func (o *ObservableProcessState) Ended(exitCode int, desc string) error {
+	err := o.ProcessState.Ended(exitCode, desc)
+	if err == nil {
+		o.debounce()
+	}
+	return err
+}
+
+func (o *ObservableProcessState) Errored(error error) error {
+	err := o.ProcessState.Errored(error)
+	if err == nil {
+		o.debounce()
+	}
+	return err
+}
+
+func (o *ObservableProcessState) Stop() {
+	close(o.Values)
+}
+
+var ObservableDebounceTime = 50 * time.Millisecond
+
+func (o *ObservableProcessState) debounce() {
+	if o.debouncer != nil {
+		o.debouncer.Reset(ObservableDebounceTime)
+		return
+	}
+	o.debouncer = time.AfterFunc(ObservableDebounceTime, func() {
+		o.Values <- o.ProcessState
+		o.debouncer.Stop()
+		o.debouncer = nil
+	})
+}

go.mod

@@ -3,19 +3,17 @@ module gitlab.irstea.fr/guillaume.perreal/coord
 go 1.12
 
 require (
-	github.com/Bowery/prompt v0.0.0-20190419144237-972d0ceb96f5 // indirect
 	github.com/hashicorp/go-hclog v0.9.2 // indirect
 	github.com/hashicorp/go-immutable-radix v1.1.0 // indirect
 	github.com/hashicorp/go-uuid v1.0.1 // indirect
 	github.com/hashicorp/golang-lru v0.5.1 // indirect
-	github.com/labstack/gommon v0.2.9 // indirect
-	github.com/mkideal/cli v0.0.3
-	github.com/mkideal/pkg v0.0.0-20170503154153-3e188c9e7ecc // indirect
 	github.com/nats-io/jwt v0.2.8 // indirect
 	github.com/nats-io/nats-streaming-server v0.15.1 // indirect
 	github.com/nats-io/nats.go v1.8.1
 	github.com/nats-io/stan.go v0.5.0
 	github.com/prometheus/procfs v0.0.3 // indirect
+	github.com/spf13/pflag v1.0.3
+	github.com/spf13/viper v1.4.0
 	go.etcd.io/bbolt v1.3.3 // indirect
 	golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4 // indirect
 	golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0 // indirect

go.sum

-github.com/Bowery/prompt v0.0.0-20190419144237-972d0ceb96f5 h1:7tNlRGC3pUEPKS3DwgX5L0s+cBloaq/JBoi9ceN1MCM=
-github.com/Bowery/prompt v0.0.0-20190419144237-972d0ceb96f5/go.mod h1:4/6eNcqZ09BZ9wLK3tZOjBA1nDj+B0728nlX5YRlSmQ=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 h1:EFSB7Zo9Eg91v7MJPVsifUysc/wPdN+NOnVe6bWbdBM=
 github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878/go.mod h1:3AMJUQhVx52RsWOnlkpikZr01T/yAVN2gn0861vByNg=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
 github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 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/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
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