Merge remote-tracking branch 'upstream/master' into pf_keep_unselected_subchannels
diff --git a/doc/command_line_tool.md b/doc/command_line_tool.md
index 6337aca..a373cbe 100644
--- a/doc/command_line_tool.md
+++ b/doc/command_line_tool.md
@@ -41,12 +41,16 @@
 git submodule update --init
 ```
 
-You also need to have the gflags library installed on your system. On Linux
-systems, gflags can be installed with the following command:
-
+You also need to have the gflags library installed on your system. gflags can be
+installed with the following command:
+Linux:
 ```
 sudo apt-get install libgflags-dev
 ```
+Mac systems with Homebrew:
+```
+brew install gflags
+```
 
 Once the prerequisites are satisfied, you can build the command line tool with
 the command:
diff --git a/src/cpp/server/server_cc.cc b/src/cpp/server/server_cc.cc
index 46872c85..36c709e 100644
--- a/src/cpp/server/server_cc.cc
+++ b/src/cpp/server/server_cc.cc
@@ -588,7 +588,7 @@
   // If this server has any support for synchronous methods (has any sync
   // server CQs), make sure that we have a ResourceExhausted handler
   // to deal with the case of thread exhaustion
-  if (!sync_server_cqs_->empty()) {
+  if (sync_server_cqs_ != nullptr && !sync_server_cqs_->empty()) {
     resource_exhausted_handler_.reset(new internal::ResourceExhaustedHandler);
   }
 
diff --git a/tools/distrib/python/grpcio_tools/grpc_tools/protobuf_generated_well_known_types_embed.cc b/tools/distrib/python/grpcio_tools/grpc_tools/protobuf_generated_well_known_types_embed.cc
deleted file mode 100644
index ba93621..0000000
--- a/tools/distrib/python/grpcio_tools/grpc_tools/protobuf_generated_well_known_types_embed.cc
+++ /dev/null
@@ -1,328 +0,0 @@
-// Copyright 2017 gRPC authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// HACK: Embed the generated well_known_types_js.cc to make
-// grpc-tools python package compilation easy.
-#include <google/protobuf/compiler/js/well_known_types_embed.h>
-struct FileToc well_known_types_js[] = {
-{"any.js",
-  "// Protocol Buffers - Google's data interchange format\n"
-  "// Copyright 2008 Google Inc.  All rights reserved.\n"
-  "// https://developers.google.com/protocol-buffers/\n"
-  "//\n"
-  "// Redistribution and use in source and binary forms, with or without\n"
-  "// modification, are permitted provided that the following conditions are\n"
-  "// met:\n"
-  "//\n"
-  "//     * Redistributions of source code must retain the above copyright\n"
-  "// notice, this list of conditions and the following disclaimer.\n"
-  "//     * Redistributions in binary form must reproduce the above\n"
-  "// copyright notice, this list of conditions and the following disclaimer\n"
-  "// in the documentation and/or other materials provided with the\n"
-  "// distribution.\n"
-  "//     * Neither the name of Google Inc. nor the names of its\n"
-  "// contributors may be used to endorse or promote products derived from\n"
-  "// this software without specific prior written permission.\n"
-  "//\n"
-  "// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n"
-  "// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n"
-  "// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n"
-  "// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n"
-  "// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n"
-  "// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n"
-  "// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n"
-  "// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n"
-  "// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n"
-  "// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n"
-  "// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n"
-  "\n"
-  "/* This code will be inserted into generated code for\n"
-  " * google/protobuf/any.proto. */\n"
-  "\n"
-  "/**\n"
-  " * Returns the type name contained in this instance, if any.\n"
-  " * @return {string|undefined}\n"
-  " */\n"
-  "proto.google.protobuf.Any.prototype.getTypeName = function() {\n"
-  "  return this.getTypeUrl().split('/').pop();\n"
-  "};\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * Packs the given message instance into this Any.\n"
-  " * @param {!Uint8Array} serialized The serialized data to pack.\n"
-  " * @param {string} name The type name of this message object.\n"
-  " * @param {string=} opt_typeUrlPrefix the type URL prefix.\n"
-  " */\n"
-  "proto.google.protobuf.Any.prototype.pack = function(serialized, name,\n"
-  "                                                    opt_typeUrlPrefix) {\n"
-  "  if (!opt_typeUrlPrefix) {\n"
-  "    opt_typeUrlPrefix = 'type.googleapis.com/';\n"
-  "  }\n"
-  "\n"
-  "  if (opt_typeUrlPrefix.substr(-1) != '/') {\n"
-  "    this.setTypeUrl(opt_typeUrlPrefix + '/' + name);\n"
-  "  } else {\n"
-  "    this.setTypeUrl(opt_typeUrlPrefix + name);\n"
-  "  }\n"
-  "\n"
-  "  this.setValue(serialized);\n"
-  "};\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * @template T\n"
-  " * Unpacks this Any into the given message object.\n"
-  " * @param {function(Uint8Array):T} deserialize Function that will deserialize\n"
-  " *     the binary data properly.\n"
-  " * @param {string} name The expected type name of this message object.\n"
-  " * @return {?T} If the name matched the expected name, returns the deserialized\n"
-  " *     object, otherwise returns undefined.\n"
-  " */\n"
-  "proto.google.protobuf.Any.prototype.unpack = function(deserialize, name) {\n"
-  "  if (this.getTypeName() == name) {\n"
-  "    return deserialize(this.getValue_asU8());\n"
-  "  } else {\n"
-  "    return null;\n"
-  "  }\n"
-  "};\n"
-},
-{"struct.js",
-  "// Protocol Buffers - Google's data interchange format\n"
-  "// Copyright 2008 Google Inc.  All rights reserved.\n"
-  "// https://developers.google.com/protocol-buffers/\n"
-  "//\n"
-  "// Redistribution and use in source and binary forms, with or without\n"
-  "// modification, are permitted provided that the following conditions are\n"
-  "// met:\n"
-  "//\n"
-  "//     * Redistributions of source code must retain the above copyright\n"
-  "// notice, this list of conditions and the following disclaimer.\n"
-  "//     * Redistributions in binary form must reproduce the above\n"
-  "// copyright notice, this list of conditions and the following disclaimer\n"
-  "// in the documentation and/or other materials provided with the\n"
-  "// distribution.\n"
-  "//     * Neither the name of Google Inc. nor the names of its\n"
-  "// contributors may be used to endorse or promote products derived from\n"
-  "// this software without specific prior written permission.\n"
-  "//\n"
-  "// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n"
-  "// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n"
-  "// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n"
-  "// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n"
-  "// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n"
-  "// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n"
-  "// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n"
-  "// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n"
-  "// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n"
-  "// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n"
-  "// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n"
-  "\n"
-  "/* This code will be inserted into generated code for\n"
-  " * google/protobuf/struct.proto. */\n"
-  "\n"
-  "/**\n"
-  " * Typedef representing plain JavaScript values that can go into a\n"
-  " *     Struct.\n"
-  " * @typedef {null|number|string|boolean|Array|Object}\n"
-  " */\n"
-  "proto.google.protobuf.JavaScriptValue;\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * Converts this Value object to a plain JavaScript value.\n"
-  " * @return {?proto.google.protobuf.JavaScriptValue} a plain JavaScript\n"
-  " *     value representing this Struct.\n"
-  " */\n"
-  "proto.google.protobuf.Value.prototype.toJavaScript = function() {\n"
-  "  var kindCase = proto.google.protobuf.Value.KindCase;\n"
-  "  switch (this.getKindCase()) {\n"
-  "    case kindCase.NULL_VALUE:\n"
-  "      return null;\n"
-  "    case kindCase.NUMBER_VALUE:\n"
-  "      return this.getNumberValue();\n"
-  "    case kindCase.STRING_VALUE:\n"
-  "      return this.getStringValue();\n"
-  "    case kindCase.BOOL_VALUE:\n"
-  "      return this.getBoolValue();\n"
-  "    case kindCase.STRUCT_VALUE:\n"
-  "      return this.getStructValue().toJavaScript();\n"
-  "    case kindCase.LIST_VALUE:\n"
-  "      return this.getListValue().toJavaScript();\n"
-  "    default:\n"
-  "      throw new Error('Unexpected struct type');\n"
-  "  }\n"
-  "};\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * Converts this JavaScript value to a new Value proto.\n"
-  " * @param {!proto.google.protobuf.JavaScriptValue} value The value to\n"
-  " *     convert.\n"
-  " * @return {!proto.google.protobuf.Value} The newly constructed value.\n"
-  " */\n"
-  "proto.google.protobuf.Value.fromJavaScript = function(value) {\n"
-  "  var ret = new proto.google.protobuf.Value();\n"
-  "  switch (goog.typeOf(value)) {\n"
-  "    case 'string':\n"
-  "      ret.setStringValue(/** @type {string} */ (value));\n"
-  "      break;\n"
-  "    case 'number':\n"
-  "      ret.setNumberValue(/** @type {number} */ (value));\n"
-  "      break;\n"
-  "    case 'boolean':\n"
-  "      ret.setBoolValue(/** @type {boolean} */ (value));\n"
-  "      break;\n"
-  "    case 'null':\n"
-  "      ret.setNullValue(proto.google.protobuf.NullValue.NULL_VALUE);\n"
-  "      break;\n"
-  "    case 'array':\n"
-  "      ret.setListValue(proto.google.protobuf.ListValue.fromJavaScript(\n"
-  "          /** @type{!Array} */ (value)));\n"
-  "      break;\n"
-  "    case 'object':\n"
-  "      ret.setStructValue(proto.google.protobuf.Struct.fromJavaScript(\n"
-  "          /** @type{!Object} */ (value)));\n"
-  "      break;\n"
-  "    default:\n"
-  "      throw new Error('Unexpected struct type.');\n"
-  "  }\n"
-  "\n"
-  "  return ret;\n"
-  "};\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * Converts this ListValue object to a plain JavaScript array.\n"
-  " * @return {!Array} a plain JavaScript array representing this List.\n"
-  " */\n"
-  "proto.google.protobuf.ListValue.prototype.toJavaScript = function() {\n"
-  "  var ret = [];\n"
-  "  var values = this.getValuesList();\n"
-  "\n"
-  "  for (var i = 0; i < values.length; i++) {\n"
-  "    ret[i] = values[i].toJavaScript();\n"
-  "  }\n"
-  "\n"
-  "  return ret;\n"
-  "};\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * Constructs a ListValue protobuf from this plain JavaScript array.\n"
-  " * @param {!Array} array a plain JavaScript array\n"
-  " * @return {proto.google.protobuf.ListValue} a new ListValue object\n"
-  " */\n"
-  "proto.google.protobuf.ListValue.fromJavaScript = function(array) {\n"
-  "  var ret = new proto.google.protobuf.ListValue();\n"
-  "\n"
-  "  for (var i = 0; i < array.length; i++) {\n"
-  "    ret.addValues(proto.google.protobuf.Value.fromJavaScript(array[i]));\n"
-  "  }\n"
-  "\n"
-  "  return ret;\n"
-  "};\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * Converts this Struct object to a plain JavaScript object.\n"
-  " * @return {!Object<string, !proto.google.protobuf.JavaScriptValue>} a plain\n"
-  " *     JavaScript object representing this Struct.\n"
-  " */\n"
-  "proto.google.protobuf.Struct.prototype.toJavaScript = function() {\n"
-  "  var ret = {};\n"
-  "\n"
-  "  this.getFieldsMap().forEach(function(value, key) {\n"
-  "    ret[key] = value.toJavaScript();\n"
-  "  });\n"
-  "\n"
-  "  return ret;\n"
-  "};\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * Constructs a Struct protobuf from this plain JavaScript object.\n"
-  " * @param {!Object} obj a plain JavaScript object\n"
-  " * @return {proto.google.protobuf.Struct} a new Struct object\n"
-  " */\n"
-  "proto.google.protobuf.Struct.fromJavaScript = function(obj) {\n"
-  "  var ret = new proto.google.protobuf.Struct();\n"
-  "  var map = ret.getFieldsMap();\n"
-  "\n"
-  "  for (var property in obj) {\n"
-  "    var val = obj[property];\n"
-  "    map.set(property, proto.google.protobuf.Value.fromJavaScript(val));\n"
-  "  }\n"
-  "\n"
-  "  return ret;\n"
-  "};\n"
-},
-{"timestamp.js",
-  "// Protocol Buffers - Google's data interchange format\n"
-  "// Copyright 2008 Google Inc.  All rights reserved.\n"
-  "// https://developers.google.com/protocol-buffers/\n"
-  "//\n"
-  "// Redistribution and use in source and binary forms, with or without\n"
-  "// modification, are permitted provided that the following conditions are\n"
-  "// met:\n"
-  "//\n"
-  "//     * Redistributions of source code must retain the above copyright\n"
-  "// notice, this list of conditions and the following disclaimer.\n"
-  "//     * Redistributions in binary form must reproduce the above\n"
-  "// copyright notice, this list of conditions and the following disclaimer\n"
-  "// in the documentation and/or other materials provided with the\n"
-  "// distribution.\n"
-  "//     * Neither the name of Google Inc. nor the names of its\n"
-  "// contributors may be used to endorse or promote products derived from\n"
-  "// this software without specific prior written permission.\n"
-  "//\n"
-  "// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n"
-  "// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n"
-  "// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n"
-  "// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n"
-  "// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n"
-  "// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n"
-  "// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n"
-  "// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n"
-  "// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n"
-  "// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n"
-  "// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n"
-  "\n"
-  "/* This code will be inserted into generated code for\n"
-  " * google/protobuf/timestamp.proto. */\n"
-  "\n"
-  "/**\n"
-  " * Returns a JavaScript 'Date' object corresponding to this Timestamp.\n"
-  " * @return {!Date}\n"
-  " */\n"
-  "proto.google.protobuf.Timestamp.prototype.toDate = function() {\n"
-  "  var seconds = this.getSeconds();\n"
-  "  var nanos = this.getNanos();\n"
-  "\n"
-  "  return new Date((seconds * 1000) + (nanos / 1000000));\n"
-  "};\n"
-  "\n"
-  "\n"
-  "/**\n"
-  " * Sets the value of this Timestamp object to be the given Date.\n"
-  " * @param {!Date} value The value to set.\n"
-  " */\n"
-  "proto.google.protobuf.Timestamp.prototype.fromDate = function(value) {\n"
-  "  var millis = value.getTime();\n"
-  "  this.setSeconds(Math.floor(value.getTime() / 1000));\n"
-  "  this.setNanos(value.getMilliseconds() * 1000000);\n"
-  "};\n"
-},
-  {NULL, NULL}  // Terminate the list.
-};
diff --git a/tools/distrib/python/grpcio_tools/setup.py b/tools/distrib/python/grpcio_tools/setup.py
index c6bcee4..c13dfe9 100644
--- a/tools/distrib/python/grpcio_tools/setup.py
+++ b/tools/distrib/python/grpcio_tools/setup.py
@@ -160,29 +160,7 @@
     plugin_sources += [
         os.path.join('grpc_tools', 'main.cc'),
         os.path.join('grpc_root', 'src', 'compiler', 'python_generator.cc')
-    ]
-
-    #HACK: Substitute the embed.cc, which is a JS to C++
-    #      preprocessor with the generated code.
-    #      The generated code should not be material
-    #      to the parts of protoc we use (it affects
-    #      the JavaScript code generator, supposedly),
-    #      but we need to be cautious about it.
-    cc_files_clone = list(CC_FILES)
-    embed_cc_file = os.path.normpath('google/protobuf/compiler/js/embed.cc')
-    well_known_types_file = os.path.normpath(
-        'google/protobuf/compiler/js/well_known_types_embed.cc')
-    if embed_cc_file in cc_files_clone:
-        cc_files_clone.remove(embed_cc_file)
-    if well_known_types_file in cc_files_clone:
-        cc_files_clone.remove(well_known_types_file)
-        plugin_sources += [
-            os.path.join('grpc_tools',
-                         'protobuf_generated_well_known_types_embed.cc')
-        ]
-    plugin_sources += [
-        os.path.join(CC_INCLUDE, cc_file) for cc_file in cc_files_clone
-    ]
+    ] + [os.path.join(CC_INCLUDE, cc_file) for cc_file in CC_FILES]
 
     plugin_ext = extension.Extension(
         name='grpc_tools._protoc_compiler',