Initial checkin of gRPC to third_party/

third_party/grpc/src/python/grpcio/grpc/framework/foundation/logging_pool.py

Index: third_party/grpc/src/python/grpcio/grpc/framework/foundation/logging_pool.py
diff --git a/third_party/WebKit/Source/devtools/scripts/devtools_file_hashes.py b/third_party/grpc/src/python/grpcio/grpc/framework/foundation/logging_pool.py
old mode 100755
new mode 100644
similarity index 50%
copy from third_party/WebKit/Source/devtools/scripts/devtools_file_hashes.py
copy to third_party/grpc/src/python/grpcio/grpc/framework/foundation/logging_pool.py
index 8c67f1cf86b325b84481899090effab28aa969aa..f82c7f7fbaebf917f2e30cffd1a63ce5454f562c
--- a/third_party/WebKit/Source/devtools/scripts/devtools_file_hashes.py
+++ b/third_party/grpc/src/python/grpcio/grpc/framework/foundation/logging_pool.py
@@ -1,5 +1,5 @@
-#!/usr/bin/env python
-# Copyright (c) 2014 Google Inc. All rights reserved.
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
@@ -27,53 +27,56 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import hashlib
-import os.path
+"""A thread pool that logs exceptions raised by tasks executed within it."""
 
-try:
-    import json
-except ImportError:
-    import simplejson as json
+import logging
 
+from concurrent import futures
 
-def save_hashes(hashes_file_path, hashes):
+
+def _wrap(behavior):
+  """Wraps an arbitrary callable behavior in exception-logging."""
+  def _wrapping(*args, **kwargs):
     try:
-        with open(hashes_file_path, "wt") as hashes_file:
-            json.dump(hashes, hashes_file, indent=4, separators=(",", ": "))
-    except:
-        print "ERROR: Failed to write %s" % hashes_file_path
-        raise
+      return behavior(*args, **kwargs)
+    except Exception as e:
+      logging.exception(
+          'Unexpected exception from %s executed in logging pool!', behavior)
+      raise
+  return _wrapping
 
 
-def load_hashes(hashes_file_path):
-    try:
-        with open(hashes_file_path, "r") as hashes_file:
-            hashes = json.load(hashes_file)
-    except:
-        return {}
-    return hashes
-
-
-def calculate_file_hash(file_path):
-    with open(file_path) as file:
-        data = file.read()
-        md5_hash = hashlib.md5(data).hexdigest()
-    return md5_hash
-
-
-def files_with_invalid_hashes(hash_file_path, file_paths):
-    hashes = load_hashes(hash_file_path)
-    result = []
-    for file_path in file_paths:
-        file_name = os.path.basename(file_path)
-        if calculate_file_hash(file_path) != hashes.get(file_name, ""):
-            result.append(file_path)
-    return result
-
-
-def update_file_hashes(hash_file_path, file_paths):
-    hashes = {}
-    for file_path in file_paths:
-        file_name = os.path.basename(file_path)
-        hashes[file_name] = calculate_file_hash(file_path)
-    save_hashes(hash_file_path, hashes)
+class _LoggingPool(object):
+  """An exception-logging futures.ThreadPoolExecutor-compatible thread pool."""
+
+  def __init__(self, backing_pool):
+    self._backing_pool = backing_pool
+
+  def __enter__(self):
+    return self
+
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    self._backing_pool.shutdown(wait=True)
+
+  def submit(self, fn, *args, **kwargs):
+    return self._backing_pool.submit(_wrap(fn), *args, **kwargs)
+
+  def map(self, func, *iterables, **kwargs):
+    return self._backing_pool.map(
+        _wrap(func), *iterables, timeout=kwargs.get('timeout', None))
+
+  def shutdown(self, wait=True):
+    self._backing_pool.shutdown(wait=wait)
+
+
+def pool(max_workers):
+  """Creates a thread pool that logs exceptions raised by the tasks within it.
+
+  Args:
+    max_workers: The maximum number of worker threads to allow the pool.
+
+  Returns:
+    A futures.ThreadPoolExecutor-compatible thread pool that logs exceptions
+      raised by the tasks executed within it.
+  """
+  return _LoggingPool(futures.ThreadPoolExecutor(max_workers))