pubsub: add keepalive (#2585)

pongad · garrettjonesgoogle · commit 6faf7f932d4f · 2017-11-07T11:36:02.000-08:00
If streaming pull connection is idle for a long time, a firewall/proxy might terminate the connection. The keepalive should prevent this from happening, or at least let us notice that the connection is terminated so we don't wait forever. Fixes #2506
diff --git a/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/Subscriber.java b/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/Subscriber.java
@@ -538,6 +538,7 @@ public static final class Builder {
     TransportChannelProvider channelProvider =
         SubscriptionAdminSettings.defaultGrpcTransportProviderBuilder()
             .setMaxInboundMessageSize(MAX_INBOUND_MESSAGE_SIZE)
+            .setKeepAliveTime(Duration.ofMinutes(5))
             .build();
     HeaderProvider headerProvider =
         SubscriptionAdminSettings.defaultApiClientHeaderProviderBuilder().build();
