Serialize Packages as a series of protocol buffers

Packages have the potential to have an exceptional number of associated
targets. When serialized in one message these targets can push the
protocol buffer representation of a Package over the default deserialization
size limit. In this commit we serialize targets separately as a series of
individual messages to avoid this limit.

--
MOS_MIGRATED_REVID=95049743

1 files changed, 14 insertions, 0 deletions

diff --git a/src/main/protobuf/build.proto b/src/main/protobuf/build.proto
index 8dfda7ed5a..895035664a 100644
--- a/src/main/protobuf/build.proto
+++ b/src/main/protobuf/build.proto
@@ -344,6 +344,20 @@ message Target {
   optional EnvironmentGroup environment_group = 6;
 }
 
+// Used to represent a series of Targets as a series of messages. Preferred
+// over repeated fields when the number of targets being serialized may result
+// in creating a serialized protocol buffer that is larger than the default
+// protocol buffer deserialization limit.
+message TargetOrTerminator {
+  oneof terminator_or_target {
+    // Is this the last message in the series?
+    bool is_terminator = 1 [default = false];
+
+    // The Target encoded in this element.
+    Target target = 2;
+  }
+}
+
 // Container for all of the blaze query results.
 message QueryResult {
   // All of the targets returned by the blaze query.