Allow configuration of multiple directory account crawler listeners (#325)

* Allow configuration of multiple directory account crawler listeners

Only one should update the local redis directory. This one is marked
with replicationPrimary true. The others in the list only serve to
issue replication requests over to CDS replication load balancers.

* Update one more metric name

service/src/main/java/org/whispersystems/textsecuregcm/configuration/DirectoryConfiguration.java

@@ -8,6 +8,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 
 import javax.validation.Valid;
 import javax.validation.constraints.NotNull;
+import java.util.List;
 
 public class DirectoryConfiguration {
 
@@ -29,7 +30,7 @@ public class DirectoryConfiguration {
   @JsonProperty
   @NotNull
   @Valid
-  private DirectoryServerConfiguration server;
+  private List<DirectoryServerConfiguration> server;
 
   public RedisConfiguration getRedisConfiguration() {
     return redis;
@@ -43,8 +44,7 @@ public class DirectoryConfiguration {
     return client;
   }
 
-  public DirectoryServerConfiguration getDirectoryServerConfiguration() {
+  public List<DirectoryServerConfiguration> getDirectoryServerConfiguration() {
     return server;
   }
-
 }

service/src/main/java/org/whispersystems/textsecuregcm/configuration/DirectoryServerConfiguration.java

@@ -9,6 +9,13 @@ import org.hibernate.validator.constraints.NotEmpty;
 
 public class DirectoryServerConfiguration {
 
+  @NotEmpty
+  @JsonProperty
+  private String replicationName;
+
+  @JsonProperty
+  private boolean replicationPrimary;
+
   @NotEmpty
   @JsonProperty
   private String replicationUrl;
@@ -21,6 +28,14 @@ public class DirectoryServerConfiguration {
   @JsonProperty
   private String replicationCaCertificate;
 
+  public String getReplicationName() {
+    return replicationName;
+  }
+
+  public boolean isReplicationPrimary() {
+    return replicationPrimary;
+  }
+
   public String getReplicationUrl() {
     return replicationUrl;
   }