Allow specifying replication opts, default to simple

config.go

@@ -13,11 +13,12 @@ import (
 
 // Config is a context for all application actions.
 type Config struct {
-	Keyspace   string
-	Hosts      []string
-	Actions    []actions.Action
-	StatsdAddr string
-	Features   map[string]bool
+	Keyspace        string
+	Hosts           []string
+	Actions         []actions.Action
+	StatsdAddr      string
+	Features        map[string]bool
+	ReplicationOpts string
 
 	provider    persistence.Provider
 	telemetry   telemetry.Datadog
@@ -64,8 +65,9 @@ func (c Config) HttpHandler() actions.HttpHandler {
 
 func (c *Config) Init() error {
 	new_provider := persistence.CassandraProvider{
-		Hosts:    c.Hosts,
-		Keyspace: c.Keyspace,
+		Hosts:       c.Hosts,
+		Keyspace:    c.Keyspace,
+		Replication: c.ReplicationOpts,
 	}
 	err := new_provider.Init()
 	if err != nil {

main.go

@@ -47,6 +47,11 @@ func main() {
 			Value: 8080,
 			Usage: "Port to listen on",
 		},
+		cli.StringFlag{
+			Name:  "replication",
+			Value: "",
+			Usage: "Cassandra keyspace replication options",
+		},
 	}
 	app.Action = func(c *cli.Context) error {
 		config := Config{}
@@ -55,6 +60,7 @@ func main() {
 		config.Keyspace = c.String("keyspace")
 		config.Hosts = strings.Split(c.String("hosts"), ",")
 		config.StatsdAddr = c.String("telemetry")
+		config.ReplicationOpts = c.String("replication")
 		if c.Bool("migrate") {
 			config.Append(actions.Migrate{})
 		}

persistence/provider.go

@@ -14,9 +14,10 @@ type Provider interface {
 }
 
 type CassandraProvider struct {
-	Hosts    []string
-	Keyspace string
-	session  *Session
+	Hosts       []string
+	Keyspace    string
+	session     *Session
+	Replication string
 }
 
 func (cp *CassandraProvider) NewCluster() *gocql.ClusterConfig {
@@ -38,7 +39,7 @@ func (cp *CassandraProvider) Session() (Session, error) {
 	return nil, fmt.Errorf("Initialize CassandraProvider with NewProvider first")
 }
 
-const createKeySpace = `CREATE KEYSPACE IF NOT EXISTS %s WITH replication = { 'class' : 'NetworkTopologyStrategy' };`
+const createKeySpace = `CREATE KEYSPACE IF NOT EXISTS %s WITH replication = %s;`
 
 func (c *CassandraProvider) createKeySpace() error {
 	cluster := c.NewCluster()
@@ -49,7 +50,7 @@ func (c *CassandraProvider) createKeySpace() error {
 		return errors.Wrap(err, "CreateSession failed")
 	}
 	defer sess.Close()
-	err = sess.Query(fmt.Sprintf(createKeySpace, c.Keyspace)).Exec()
+	err = sess.Query(fmt.Sprintf(createKeySpace, c.Keyspace, c.Replication)).Exec()
 	if err != nil {
 		return errors.Wrap(err, "Query to CreateKeyspace failed")
 	}
@@ -67,6 +68,9 @@ func (cp *CassandraProvider) MigrationSession() (MigrationSession, error) {
 }
 
 func (c *CassandraProvider) Init() error {
+	if len(c.Replication) == 0 {
+		c.Replication = "{ 'class' : 'SimpleStrategy', 'replication_factor' : 1 }"
+	}
 	err := c.createKeySpace()
 	if err != nil {
 		return err