1 files changed, 113 insertions, 114 deletions
diff --git a/src/python/grpcio/grpc/framework/foundation/stream_util.py b/src/python/grpcio/grpc/framework/foundation/stream_util.py
index a6f234f1fe..6b356f176f 100644
--- a/src/python/grpcio/grpc/framework/foundation/stream_util.py
+++ b/src/python/grpcio/grpc/framework/foundation/stream_util.py
@@ -26,7 +26,6 @@
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
 """Helpful utilities related to the stream module."""
 
 import logging
@@ -38,126 +37,126 @@ _NO_VALUE = object()
 
 
 class TransformingConsumer(stream.Consumer):
-  """A stream.Consumer that passes a transformation of its input to another."""
+    """A stream.Consumer that passes a transformation of its input to another."""
 
-  def __init__(self, transformation, downstream):
-    self._transformation = transformation
-    self._downstream = downstream
+    def __init__(self, transformation, downstream):
+        self._transformation = transformation
+        self._downstream = downstream
 
-  def consume(self, value):
-    self._downstream.consume(self._transformation(value))
+    def consume(self, value):
+        self._downstream.consume(self._transformation(value))
 
-  def terminate(self):
-    self._downstream.terminate()
+    def terminate(self):
+        self._downstream.terminate()
 
-  def consume_and_terminate(self, value):
-    self._downstream.consume_and_terminate(self._transformation(value))
+    def consume_and_terminate(self, value):
+        self._downstream.consume_and_terminate(self._transformation(value))
 
 
 class IterableConsumer(stream.Consumer):
-  """A Consumer that when iterated over emits the values it has consumed."""
-
-  def __init__(self):
-    self._condition = threading.Condition()
-    self._values = []
-    self._active = True
-
-  def consume(self, stock_reply):
-    with self._condition:
-      if self._active:
-        self._values.append(stock_reply)
-        self._condition.notify()
-
-  def terminate(self):
-    with self._condition:
-      self._active = False
-      self._condition.notify()
-
-  def consume_and_terminate(self, stock_reply):
-    with self._condition:
-      if self._active:
-        self._values.append(stock_reply)
-        self._active = False
-        self._condition.notify()
-
-  def __iter__(self):
-    return self
-
-  def __next__(self):
-    return self.next()
-
-  def next(self):
-    with self._condition:
-      while self._active and not self._values:
-        self._condition.wait()
-      if self._values:
-        return self._values.pop(0)
-      else:
-        raise StopIteration()
+    """A Consumer that when iterated over emits the values it has consumed."""
+
+    def __init__(self):
+        self._condition = threading.Condition()
+        self._values = []
+        self._active = True
+
+    def consume(self, stock_reply):
+        with self._condition:
+            if self._active:
+                self._values.append(stock_reply)
+                self._condition.notify()
+
+    def terminate(self):
+        with self._condition:
+            self._active = False
+            self._condition.notify()
+
+    def consume_and_terminate(self, stock_reply):
+        with self._condition:
+            if self._active:
+                self._values.append(stock_reply)
+                self._active = False
+                self._condition.notify()
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self.next()
+
+    def next(self):
+        with self._condition:
+            while self._active and not self._values:
+                self._condition.wait()
+            if self._values:
+                return self._values.pop(0)
+            else:
+                raise StopIteration()
 
 
 class ThreadSwitchingConsumer(stream.Consumer):
-  """A Consumer decorator that affords serialization and asynchrony."""
-
-  def __init__(self, sink, pool):
-    self._lock = threading.Lock()
-    self._sink = sink
-    self._pool = pool
-    # True if self._spin has been submitted to the pool to be called once and
-    # that call has not yet returned, False otherwise.
-    self._spinning = False
-    self._values = []
-    self._active = True
-
-  def _spin(self, sink, value, terminate):
-    while True:
-      try:
-        if value is _NO_VALUE:
-          sink.terminate()
-        elif terminate:
-          sink.consume_and_terminate(value)
-        else:
-          sink.consume(value)
-      except Exception as e:  # pylint:disable=broad-except
-        logging.exception(e)
-
-      with self._lock:
-        if terminate:
-          self._spinning = False
-          return
-        elif self._values:
-          value = self._values.pop(0)
-          terminate = not self._values and not self._active
-        elif not self._active:
-          value = _NO_VALUE
-          terminate = True
-        else:
-          self._spinning = False
-          return
-
-  def consume(self, value):
-    with self._lock:
-      if self._active:
-        if self._spinning:
-          self._values.append(value)
-        else:
-          self._pool.submit(self._spin, self._sink, value, False)
-          self._spinning = True
-
-  def terminate(self):
-    with self._lock:
-      if self._active:
-        self._active = False
-        if not self._spinning:
-          self._pool.submit(self._spin, self._sink, _NO_VALUE, True)
-          self._spinning = True
-
-  def consume_and_terminate(self, value):
-    with self._lock:
-      if self._active:
-        self._active = False
-        if self._spinning:
-          self._values.append(value)
-        else:
-          self._pool.submit(self._spin, self._sink, value, True)
-          self._spinning = True
+    """A Consumer decorator that affords serialization and asynchrony."""
+
+    def __init__(self, sink, pool):
+        self._lock = threading.Lock()
+        self._sink = sink
+        self._pool = pool
+        # True if self._spin has been submitted to the pool to be called once and
+        # that call has not yet returned, False otherwise.
+        self._spinning = False
+        self._values = []
+        self._active = True
+
+    def _spin(self, sink, value, terminate):
+        while True:
+            try:
+                if value is _NO_VALUE:
+                    sink.terminate()
+                elif terminate:
+                    sink.consume_and_terminate(value)
+                else:
+                    sink.consume(value)
+            except Exception as e:  # pylint:disable=broad-except
+                logging.exception(e)
+
+            with self._lock:
+                if terminate:
+                    self._spinning = False
+                    return
+                elif self._values:
+                    value = self._values.pop(0)
+                    terminate = not self._values and not self._active
+                elif not self._active:
+                    value = _NO_VALUE
+                    terminate = True
+                else:
+                    self._spinning = False
+                    return
+
+    def consume(self, value):
+        with self._lock:
+            if self._active:
+                if self._spinning:
+                    self._values.append(value)
+                else:
+                    self._pool.submit(self._spin, self._sink, value, False)
+                    self._spinning = True
+
+    def terminate(self):
+        with self._lock:
+            if self._active:
+                self._active = False
+                if not self._spinning:
+                    self._pool.submit(self._spin, self._sink, _NO_VALUE, True)
+                    self._spinning = True
+
+    def consume_and_terminate(self, value):
+        with self._lock:
+            if self._active:
+                self._active = False
+                if self._spinning:
+                    self._values.append(value)
+                else:
+                    self._pool.submit(self._spin, self._sink, value, True)
+                    self._spinning = True