Add LogDog / annotation protobuf support.

recipes.py

Index: recipes.py
diff --git a/recipes.py b/recipes.py
index 744aa6f5d6e4215f253ffbf954d25c2ead5a46df..24c932c84a151c86b7a5a951b8b73edb1b514c04 100755
--- a/recipes.py
+++ b/recipes.py
@@ -92,6 +92,7 @@ def run(package_deps, args, op_args):
   from recipe_engine import loader
   from recipe_engine import step_runner
   from recipe_engine import stream
+  from recipe_engine import stream_logdog
 
   def get_properties_from_args(args):
     properties = dict(x.split('=', 1) for x in args)
@@ -152,12 +153,35 @@ def run(package_deps, args, op_args):
 
   old_cwd = os.getcwd()
   os.chdir(workdir)
-  stream_engine = stream.ProductStreamEngine(
-      stream.StreamEngineInvariants(),
-      stream.AnnotatorStreamEngine(
+
+  # Construct our stream engine.
+  #
+  # We begin with a ProductStreamEngine seeded with StreamEngineInvariants. As
+  # we evaluate our configuration, we will append additional StreamEngine
+  # instances to the ProductStreamEngine.
+  stream_engine = stream.ProductStreamEngine(stream.StreamEngineInvariants())
+
+  def build_annotation_stream_engine():
+    return stream.AnnotatorStreamEngine(
         sys.stdout,
         emit_timestamps=(args.timestamps or
-                         op_args.annotation_flags.emit_timestamp)))
+                         op_args.annotation_flags.emit_timestamp),
+    )
+
+  if op_args.logdog.streamserver_uri:
+    logging.debug('Using LogDog with parameters [%v]', op_args.logdog)
+    stream_engine.append_stream_engine(stream_logdog.StreamEngine(
+        streamserver_uri=op_args.logdog.streamserver_uri,
+        name_base=(op_args.logdog.name_base or None),
+    ))
+
+    # If we're teeing, also fold in a standard annotation stream engine.
+    if op_args.logdog.tee:
+      stream_engine.append_stream_engine(build_annotation_stream_engine())
+  else:
+    # Not using LogDog; use a standard annotation stream engine.
+    stream_engine.append_stream_engine(build_annotation_stream_engine())
+
   with stream_engine:
     # Emit initial properties if configured to do so.
     if op_args.annotation_flags.emit_initial_properties: