Accept a list of kafka producer URIs

src/github.com/matrix-org/dendrite/clientapi/clientapi.go

@@ -12,6 +12,7 @@ import (
 
 	log "github.com/Sirupsen/logrus"
 	"github.com/matrix-org/dugong"
+	sarama "gopkg.in/Shopify/sarama.v1"
 )
 
 func setupLogging(logDir string) {
@@ -38,17 +39,28 @@ func main() {
 	if logDir != "" {
 		setupLogging(logDir)
 	}
-	log.Info("Starting clientapi")
+
 	// TODO: Rather than generating a new key on every startup, we should be
 	//       reading a PEM formatted file instead.
 	_, privKey, err := ed25519.GenerateKey(nil)
 	if err != nil {
 		log.Panicf("Failed to generate private key: %s", err)
 	}
-	routing.Setup(http.DefaultServeMux, http.DefaultClient, config.ClientAPI{
-		ServerName: "localhost",
-		KeyID:      "ed25519:something",
-		PrivateKey: privKey,
-	})
+
+	cfg := config.ClientAPI{
+		ServerName:        "localhost",
+		KeyID:             "ed25519:something",
+		PrivateKey:        privKey,
+		KafkaProducerURIs: []string{"localhost"},
+	}
+
+	log.Info("Starting clientapi")
+
+	producer, err := sarama.NewSyncProducer(cfg.KafkaProducerURIs, nil)
+	if err != nil {
+		log.Panicf("Failed to setup kafka producers(%s): %s", cfg.KafkaProducerURIs, err)
+	}
+
+	routing.Setup(http.DefaultServeMux, http.DefaultClient, cfg, producer)
 	log.Fatal(http.ListenAndServe(bindAddr, nil))
 }

src/github.com/matrix-org/dendrite/clientapi/config/config.go

@@ -4,7 +4,13 @@ import "golang.org/x/crypto/ed25519"
 
 // ClientAPI contains the config information necessary to spin up a clientapi process.
 type ClientAPI struct {
+	// The name of the server. This is usually the domain name, e.g 'matrix.org', 'localhost'.
 	ServerName string
+	// The private key which will be used to sign events.
 	PrivateKey ed25519.PrivateKey
-	KeyID      string
+	// An arbitrary string used to uniquely identify the PrivateKey. Must start with the
+	// prefix "ed25519:".
+	KeyID string
+	// A list of URIs to send events to. These kafka logs should be consumed by a Room Server.
+	KafkaProducerURIs []string
 }

src/github.com/matrix-org/dendrite/clientapi/routing/routing.go

@@ -9,13 +9,14 @@ import (
 	"github.com/matrix-org/dendrite/clientapi/writers"
 	"github.com/matrix-org/util"
 	"github.com/prometheus/client_golang/prometheus"
+	sarama "gopkg.in/Shopify/sarama.v1"
 )
 
 const pathPrefixR0 = "/_matrix/client/r0"
 
 // Setup registers HTTP handlers with the given ServeMux. It also supplies the given http.Client
 // to clients which need to make outbound HTTP requests.
-func Setup(servMux *http.ServeMux, httpClient *http.Client, cfg config.ClientAPI) {
+func Setup(servMux *http.ServeMux, httpClient *http.Client, cfg config.ClientAPI, producer sarama.SyncProducer) {
 	apiMux := mux.NewRouter()
 	r0mux := apiMux.PathPrefix(pathPrefixR0).Subrouter()
 	r0mux.Handle("/createRoom", make("createRoom", util.NewJSONRequestHandler(func(req *http.Request) util.JSONResponse {