Merge pull request #26 from jeroenrinzema/v0.6.0-dialect

feat: improved dialect interface and implementation

dialects/kafka/main.go

@@ -10,7 +10,6 @@ import (
 // Dialect represents the kafka dialect
 type Dialect struct {
 	Connection Config
-	Topics     []types.Topic
 	Config     *sarama.Config
 
 	consumer *consumer.Client
@@ -53,14 +52,9 @@ func (dialect *Dialect) Producer() types.Producer {
 	return dialect.producer
 }
 
-// Assigned is called when a topic gets created
-func (dialect *Dialect) Assigned(topic types.Topic) {
-	dialect.Topics = append(dialect.Topics, topic)
-}
-
 // Open opens a kafka consumer and producer
-func (dialect *Dialect) Open() (err error) {
-	err = dialect.consumer.Connect(dialect.Connection.Brokers, dialect.Config, dialect.Connection.InitialOffset, dialect.Topics...)
+func (dialect *Dialect) Open(topics []types.Topic) (err error) {
+	err = dialect.consumer.Connect(dialect.Connection.Brokers, dialect.Config, dialect.Connection.InitialOffset, topics...)
 	if err != nil {
 		return err
 	}

dialects/mock/main.go

@@ -47,15 +47,10 @@ type Dialect struct {
 
 // Open notifies a dialect to open the dialect.
 // No further topic assignments should be made.
-func (dialect *Dialect) Open() error {
+func (dialect *Dialect) Open([]types.Topic) error {
 	return nil
 }
 
-// Assigned notifies a dialect about the assignment of the given topic
-func (dialect *Dialect) Assigned(types.Topic) {
-	// ignore...
-}
-
 // Consumer returns the dialect consumer
 func (dialect *Dialect) Consumer() types.Consumer {
 	return dialect.consumer

dialects/mock/main_test.go

@@ -6,7 +6,7 @@ import "testing"
 func TestNewDialectConstruction(t *testing.T) {
 	dialect := NewDialect()
 
-	dialect.Open()
+	dialect.Open(nil)
 
 	if dialect.Consumer() == nil {
 		t.Fatal("no dialect consumer")

examples/mock/go.sum

@@ -6,15 +6,28 @@ cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSR
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@@ -27,11 +40,14 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
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@@ -44,22 +60,45 @@ github.com/jeroenrinzema/commander/examples/mock-multiple-groups v0.0.0-20190530
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@@ -88,7 +127,9 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -100,6 +141,7 @@ golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3
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@@ -122,6 +164,7 @@ google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3
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 google.golang.org/grpc v1.20.1 h1:Hz2g2wirWK7H0qIIhGIqRGTuMwTE8HEKFnDZZ7lm9NU=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=

internal/types/dialect.go

@@ -3,9 +3,6 @@ package types
 // Dialect represents a commander dialect.
 // A dialect is responsible for the consumption/production of the targeted protocol.
 type Dialect interface {
-	// Assigned notifies a dialect about the assignment of the given topic
-	Assigned(topic Topic)
-
 	// Consumer returns the dialect consumer
 	Consumer() Consumer
 
@@ -17,9 +14,8 @@ type Dialect interface {
 	// The user should implement the health check
 	Healthy() bool
 
-	// Open notifies a dialect to open the dialect.
-	// No further topic assignments should be made.
-	Open() error
+	// Opens the given dialect to start accepting incoming and outgoing connections.
+	Open(topics []Topic) error
 
 	// Close awaits till the consumer(s) and producer(s) of the given dialect are closed.
 	// If an error is returned is the closing aborted and the error returned to the user.

main.go

@@ -33,27 +33,12 @@ func NewClient(groups ...*Group) (*Client, error) {
 		Groups: groups,
 	}
 
-	topics := []types.Topic{}
-	dialects := []types.Dialect{}
+	appendMiddleware(middleware, groups)
+	topics := pullTopicsFromGroups(groups)
+	dialects := groupTopicsByDialect(topics)
 
-	for _, group := range groups {
-		group.Middleware = middleware
-		topics = append(topics, group.Topics...)
-	}
-
-topic:
-	for _, topic := range topics {
-		for _, dialect := range dialects {
-			if topic.Dialect() == dialect {
-				continue topic
-			}
-		}
-
-		dialects = append(dialects, topic.Dialect())
-	}
-
-	for _, dialect := range dialects {
-		err := dialect.Open()
+	for dialect, topics := range dialects {
+		err := dialect.Open(topics)
 		if err != nil {
 			return nil, err
 		}
@@ -85,3 +70,32 @@ func (client *Client) Close() error {
 
 	return nil
 }
+
+func pullTopicsFromGroups(groups []*Group) []types.Topic {
+	returned := []types.Topic{}
+	for _, group := range groups {
+		returned = append(returned, group.Topics...)
+	}
+
+	return returned
+}
+
+func appendMiddleware(middleware middleware.Use, groups []*Group) {
+	for _, group := range groups {
+		group.Middleware = middleware
+	}
+}
+
+func groupTopicsByDialect(topics []types.Topic) map[types.Dialect][]types.Topic {
+	returned := map[types.Dialect][]types.Topic{}
+	for _, topic := range topics {
+		_, has := returned[topic.Dialect()]
+		if !has {
+			returned[topic.Dialect()] = []types.Topic{}
+		}
+
+		returned[topic.Dialect()] = append(returned[topic.Dialect()], topic)
+	}
+
+	return returned
+}