mdb/mpubsub: refactor to use new mctx/mlog/mcfg stuff

mdb/mpubsub/pubsub.go

@@ -9,15 +9,20 @@ import (
 	"time"
 
 	"cloud.google.com/go/pubsub"
-	"github.com/mediocregopher/mediocre-go-lib/m"
+	"github.com/mediocregopher/mediocre-go-lib/mctx"
-	"github.com/mediocregopher/mediocre-go-lib/mcfg"
 	"github.com/mediocregopher/mediocre-go-lib/mdb"
+	"github.com/mediocregopher/mediocre-go-lib/merr"
 	"github.com/mediocregopher/mediocre-go-lib/mlog"
+	"github.com/mediocregopher/mediocre-go-lib/mrun"
 	oldctx "golang.org/x/net/context"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )
 
+// TODO this package still uses context.Context in the callback functions
+// TODO Consume (and probably BatchConsume) don't properly handle the Client
+// being closed.
+
 func isErrAlreadyExists(err error) bool {
 	if err == nil {
 		return false
@@ -37,24 +42,39 @@ type PubSub struct {
 	log *mlog.Logger
 }
 
-// Cfg configures and returns a PubSub instance which will be usable once
+// MNew returns a PubSub instance which will be initialized and configured when
-// StartRun is called on the passed in Cfg instance.
+// the start event is triggered on ctx (see mrun.Start). The PubSub instance
-func Cfg(cfg *mcfg.Cfg) *PubSub {
+// will have Close called on it when the stop event is triggered on ctx (see
-	cfg = cfg.Child("pubsub")
+// mrun.Stop).
-	var ps PubSub
+//
-	ps.gce = mdb.CfgGCE(cfg)
+// gce is optional and can be passed in if there's an existing gce object which
-	ps.log = m.Log(cfg, &ps)
+// should be used, otherwise a new one will be created with mdb.MGCE.
-	cfg.Start.Then(func(ctx context.Context) error {
+func MNew(ctx mctx.Context, gce *mdb.GCE) *PubSub {
+	if gce == nil {
+		gce = mdb.MGCE(ctx, "")
+	}
+
+	ctx = mctx.ChildOf(ctx, "pubsub")
+	ps := &PubSub{
+		gce: gce,
+		log: mlog.From(ctx),
+	}
+	ps.log.SetKV(ps)
+
+	mrun.OnStart(ctx, func(innerCtx mctx.Context) error {
 		ps.log.Info("connecting to pubsub")
 		var err error
-		ps.Client, err = pubsub.NewClient(ctx, ps.gce.Project, ps.gce.ClientOptions()...)
+		ps.Client, err = pubsub.NewClient(innerCtx, ps.gce.Project, ps.gce.ClientOptions()...)
-		return mlog.ErrWithKV(err, &ps)
+		return merr.WithKV(err, ps.KV())
 	})
-	return &ps
+	mrun.OnStop(ctx, func(mctx.Context) error {
+		return ps.Client.Close()
+	})
+	return ps
 }
 
 // KV implements the mlog.KVer interface
-func (ps *PubSub) KV() mlog.KV {
+func (ps *PubSub) KV() map[string]interface{} {
 	return ps.gce.KV()
 }
 
@@ -67,44 +87,43 @@ type Topic struct {
 
 // Topic returns, after potentially creating, a topic of the given name
 func (ps *PubSub) Topic(ctx context.Context, name string, create bool) (*Topic, error) {
-	kv := mlog.KVerFunc(func() mlog.KV {
+	t := &Topic{
-		return ps.KV().Set("topicName", name)
+		ps:   ps,
-	})
+		name: name,
+	}
 
-	var t *pubsub.Topic
 	var err error
 	if create {
-		t, err = ps.Client.CreateTopic(ctx, name)
+		t.topic, err = ps.Client.CreateTopic(ctx, name)
 		if isErrAlreadyExists(err) {
-			t = ps.Client.Topic(name)
+			t.topic = ps.Client.Topic(name)
 		} else if err != nil {
-			return nil, mlog.ErrWithKV(err, kv)
+			return nil, merr.WithKV(err, t.KV())
 		}
 	} else {
-		t = ps.Client.Topic(name)
+		t.topic = ps.Client.Topic(name)
-		if exists, err := t.Exists(ctx); err != nil {
+		if exists, err := t.topic.Exists(ctx); err != nil {
-			return nil, mlog.ErrWithKV(err, kv)
+			return nil, merr.WithKV(err, t.KV())
 		} else if !exists {
-			return nil, mlog.ErrWithKV(errors.New("topic dne"), kv)
+			err := merr.New("topic dne")
+			return nil, merr.WithKV(err, t.KV())
 		}
 	}
-	return &Topic{
+	return t, nil
-		ps:    ps,
-		topic: t,
-		name:  name,
-	}, nil
 }
 
 // KV implements the mlog.KVer interface
-func (t *Topic) KV() mlog.KV {
+func (t *Topic) KV() map[string]interface{} {
-	return t.ps.KV().Set("topicName", t.name)
+	kv := t.ps.KV()
+	kv["topicName"] = t.name
+	return kv
 }
 
 // Publish publishes a message with the given data as its body to the Topic
 func (t *Topic) Publish(ctx context.Context, data []byte) error {
 	_, err := t.topic.Publish(ctx, &Message{Data: data}).Get(ctx)
 	if err != nil {
-		return mlog.ErrWithKV(err, t)
+		return merr.WithKV(err, t.KV())
 	}
 	return nil
 }
@@ -123,39 +142,38 @@ type Subscription struct {
 // for the Topic
 func (t *Topic) Subscription(ctx context.Context, name string, create bool) (*Subscription, error) {
 	name = t.name + "_" + name
-	kv := mlog.KVerFunc(func() mlog.KV {
+	s := &Subscription{
-		return t.KV().Set("subName", name)
+		topic: t,
-	})
+		name:  name,
+	}
 
-	var s *pubsub.Subscription
 	var err error
 	if create {
-		s, err = t.ps.CreateSubscription(ctx, name, pubsub.SubscriptionConfig{
+		s.sub, err = t.ps.CreateSubscription(ctx, name, pubsub.SubscriptionConfig{
 			Topic: t.topic,
 		})
 		if isErrAlreadyExists(err) {
-			s = t.ps.Subscription(name)
+			s.sub = t.ps.Subscription(name)
 		} else if err != nil {
-			return nil, mlog.ErrWithKV(err, kv)
+			return nil, merr.WithKV(err, s.KV())
 		}
 	} else {
-		s = t.ps.Subscription(name)
+		s.sub = t.ps.Subscription(name)
-		if exists, err := s.Exists(ctx); err != nil {
+		if exists, err := s.sub.Exists(ctx); err != nil {
-			return nil, mlog.ErrWithKV(err, kv)
+			return nil, merr.WithKV(err, s.KV())
 		} else if !exists {
-			return nil, mlog.ErrWithKV(errors.New("sub dne"), kv)
+			err := merr.New("sub dne")
+			return nil, merr.WithKV(err, s.KV())
 		}
 	}
-	return &Subscription{
+	return s, nil
-		topic: t,
-		sub:   s,
-		name:  name,
-	}, nil
 }
 
 // KV implements the mlog.KVer interface
-func (s *Subscription) KV() mlog.KV {
+func (s *Subscription) KV() map[string]interface{} {
-	return s.topic.KV().Set("subName", s.name)
+	kv := s.topic.KV()
+	kv["subName"] = s.name
+	return kv
 }
 
 // ConsumerFunc is a function which messages being consumed will be passed. The
@@ -208,7 +226,7 @@ func (s *Subscription) Consume(ctx context.Context, fn ConsumerFunc, opts Consum
 
 			ok, err := fn(context.Context(innerCtx), msg)
 			if err != nil {
-				s.topic.ps.log.Warn("error consuming pubsub message", s, mlog.ErrKV(err))
+				s.topic.ps.log.Warn("error consuming pubsub message", s, merr.KV(err))
 			}
 
 			if ok {
@@ -220,7 +238,8 @@ func (s *Subscription) Consume(ctx context.Context, fn ConsumerFunc, opts Consum
 		if octx.Err() == context.Canceled || err == nil {
 			return
 		} else if err != nil {
-			s.topic.ps.log.Warn("error consuming from pubsub", s, mlog.ErrKV(err))
+			s.topic.ps.log.Warn("error consuming from pubsub", s, merr.KV(err))
+			time.Sleep(1 * time.Second)
 		}
 	}
 }
@@ -312,7 +331,7 @@ func (s *Subscription) BatchConsume(
 				}
 				ret, err := fn(thisCtx, msgs)
 				if err != nil {
-					s.topic.ps.log.Warn("error consuming pubsub batch messages", s, mlog.ErrKV(err))
+					s.topic.ps.log.Warn("error consuming pubsub batch messages", s, merr.KV(err))
 				}
 				for i := range thisGroup {
 					thisGroup[i].retCh <- ret // retCh is buffered

mdb/mpubsub/pubsub_test.go

@@ -5,33 +5,27 @@ import (
 	. "testing"
 	"time"
 
-	"github.com/mediocregopher/mediocre-go-lib/mcfg"
-	"github.com/mediocregopher/mediocre-go-lib/mdb"
 	"github.com/mediocregopher/mediocre-go-lib/mrand"
+	"github.com/mediocregopher/mediocre-go-lib/mtest"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
-var testPS *PubSub
-
-func init() {
-	mdb.DefaultGCEProject = "test"
-	cfg := mcfg.New()
-	testPS = Cfg(cfg)
-	cfg.StartTestRun()
-}
-
 // this requires the pubsub emulator to be running
 func TestPubSub(t *T) {
+	ctx := mtest.NewCtx()
+	mtest.SetEnv(ctx, "GCE_PROJECT", "test")
+	ps := MNew(ctx, nil)
+	mtest.Run(ctx, t, func() {
 		topicName := "testTopic_" + mrand.Hex(8)
 		ctx := context.Background()
 
 		// Topic shouldn't exist yet
-	_, err := testPS.Topic(ctx, topicName, false)
+		_, err := ps.Topic(ctx, topicName, false)
 		require.Error(t, err)
 
 		// ...so create it
-	topic, err := testPS.Topic(ctx, topicName, true)
+		topic, err := ps.Topic(ctx, topicName, true)
 		require.NoError(t, err)
 
 		// Create a subscription and consumer
@@ -49,12 +43,17 @@ func TestPubSub(t *T) {
 		assert.NoError(t, topic.Publish(ctx, []byte("foo")))
 		msg := <-msgCh
 		assert.Equal(t, []byte("foo"), msg.Data)
+	})
 }
 
 func TestBatchPubSub(t *T) {
-	ctx := context.Background()
+	ctx := mtest.NewCtx()
+	mtest.SetEnv(ctx, "GCE_PROJECT", "test")
+	ps := MNew(ctx, nil)
+	mtest.Run(ctx, t, func() {
+
 		topicName := "testBatchTopic_" + mrand.Hex(8)
-	topic, err := testPS.Topic(ctx, topicName, true)
+		topic, err := ps.Topic(ctx, topicName, true)
 		require.NoError(t, err)
 
 		readBatch := func(ch chan []*Message) map[byte]int {
@@ -170,4 +169,5 @@ func TestBatchPubSub(t *T) {
 			cancel()
 			<-ch
 		}
+	})
 }