Change existing build system for CFStream

22 files changed, 196 insertions, 21 deletions

diff --git a/build.yaml b/build.yaml
index e9ad25d711..73fd2cd0e9 100644
--- a/build.yaml
+++ b/build.yaml
@@ -274,6 +274,7 @@ filegroups:
   - src/core/lib/iomgr/gethostname_sysconf.cc
   - src/core/lib/iomgr/iocp_windows.cc
   - src/core/lib/iomgr/iomgr.cc
+  - src/core/lib/iomgr/iomgr_cfstream.cc
   - src/core/lib/iomgr/iomgr_custom.cc
   - src/core/lib/iomgr/iomgr_internal.cc
   - src/core/lib/iomgr/iomgr_posix.cc
@@ -446,6 +447,7 @@ filegroups:
   - src/core/lib/iomgr/gethostname.h
   - src/core/lib/iomgr/iocp_windows.h
   - src/core/lib/iomgr/iomgr.h
+  - src/core/lib/iomgr/iomgr_cfstream.h
   - src/core/lib/iomgr/iomgr_custom.h
   - src/core/lib/iomgr/iomgr_internal.h
   - src/core/lib/iomgr/iomgr_posix.h
@@ -1334,6 +1336,20 @@ filegroups:
   deps:
   - grpc++
   - grpc
+- name: grpc_cfstream
+  language: objc++
+  headers:
+  - src/core/lib/iomgr/error_apple.h
+  - src/core/lib/iomgr/tcp_cfstream.h
+  - src/core/lib/iomgr/tcp_cfstream_sync.h
+  src:
+  - src/core/lib/iomgr/error_apple.mm
+  - src/core/lib/iomgr/tcp_cfstream.mm
+  - src/core/lib/iomgr/tcp_cfstream_sync.mm
+  - src/core/lib/iomgr/tcp_client_cfstream.mm
+  uses:
+  - gpr_base_headers
+  - grpc_base_headers
 libs:
 - name: address_sorting
   build: all
diff --git a/src/core/lib/iomgr/ev_epoll1_linux.cc b/src/core/lib/iomgr/ev_epoll1_linux.cc
index 3ebaf181c1..4b4c954d27 100644
--- a/src/core/lib/iomgr/ev_epoll1_linux.cc
+++ b/src/core/lib/iomgr/ev_epoll1_linux.cc
@@ -1237,7 +1237,7 @@ const grpc_event_engine_vtable* grpc_init_epoll1_linux(bool explicit_request) {
 }
 
 #else /* defined(GRPC_LINUX_EPOLL) */
-#if defined(GRPC_POSIX_SOCKET)
+#if defined(GRPC_POSIX_SOCKET_EV_EPOLL1)
 #include "src/core/lib/iomgr/ev_epoll1_linux.h"
 /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return
  * NULL */
diff --git a/src/core/lib/iomgr/ev_epollex_linux.cc b/src/core/lib/iomgr/ev_epollex_linux.cc
index 44d8cf2b1e..1cb9105ed9 100644
--- a/src/core/lib/iomgr/ev_epollex_linux.cc
+++ b/src/core/lib/iomgr/ev_epollex_linux.cc
@@ -1500,7 +1500,7 @@ const grpc_event_engine_vtable* grpc_init_epollex_linux(
 }
 
 #else /* defined(GRPC_LINUX_EPOLL_CREATE1) */
-#if defined(GRPC_POSIX_SOCKET)
+#if defined(GRPC_POSIX_SOCKET_EV_EPOLLEX)
 #include "src/core/lib/iomgr/ev_epollex_linux.h"
 /* If GRPC_LINUX_EPOLL_CREATE1 is not defined, it means
    epoll_create1 is not available. Return NULL */
diff --git a/src/core/lib/iomgr/ev_epollsig_linux.cc b/src/core/lib/iomgr/ev_epollsig_linux.cc
index 1e30f6637b..4991f468eb 100644
--- a/src/core/lib/iomgr/ev_epollsig_linux.cc
+++ b/src/core/lib/iomgr/ev_epollsig_linux.cc
@@ -1721,7 +1721,7 @@ const grpc_event_engine_vtable* grpc_init_epollsig_linux(
 }
 
 #else /* defined(GRPC_LINUX_EPOLL_CREATE1) */
-#if defined(GRPC_POSIX_SOCKET)
+#if defined(GRPC_POSIX_SOCKET_EV_EPOLLSIG)
 #include "src/core/lib/iomgr/ev_epollsig_linux.h"
 /* If GRPC_LINUX_EPOLL_CREATE1 is not defined, it means
    epoll_create1 is not available. Return NULL */
diff --git a/src/core/lib/iomgr/ev_poll_posix.cc b/src/core/lib/iomgr/ev_poll_posix.cc
index d9aba9b6a3..1c1da3b38a 100644
--- a/src/core/lib/iomgr/ev_poll_posix.cc
+++ b/src/core/lib/iomgr/ev_poll_posix.cc
@@ -20,7 +20,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_EV_POLL
 
 #include "src/core/lib/iomgr/ev_poll_posix.h"
 
diff --git a/src/core/lib/iomgr/ev_posix.cc b/src/core/lib/iomgr/ev_posix.cc
index 8b80070265..20b1f8df1a 100644
--- a/src/core/lib/iomgr/ev_posix.cc
+++ b/src/core/lib/iomgr/ev_posix.cc
@@ -20,7 +20,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_EV
 
 #include "src/core/lib/iomgr/ev_posix.h"
 
@@ -327,4 +327,4 @@ void grpc_pollset_set_del_fd(grpc_pollset_set* pollset_set, grpc_fd* fd) {
   g_event_engine->pollset_set_del_fd(pollset_set, fd);
 }
 
-#endif  // GRPC_POSIX_SOCKET
+#endif  // GRPC_POSIX_SOCKET_EV
diff --git a/src/core/lib/iomgr/iomgr_cfstream.cc b/src/core/lib/iomgr/iomgr_cfstream.cc
new file mode 100644
index 0000000000..2fde202b8a
--- /dev/null
+++ b/src/core/lib/iomgr/iomgr_cfstream.cc
@@ -0,0 +1,66 @@
+/*
+ *
+ * Copyright 2018 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.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/iomgr/port.h"
+
+#ifdef GRPC_CFSTREAM_IOMGR
+
+#include "src/core/lib/debug/trace.h"
+#include "src/core/lib/iomgr/ev_posix.h"
+#include "src/core/lib/iomgr/iomgr_internal.h"
+#include "src/core/lib/iomgr/iomgr_posix.h"
+#include "src/core/lib/iomgr/resolve_address.h"
+#include "src/core/lib/iomgr/tcp_client.h"
+#include "src/core/lib/iomgr/tcp_posix.h"
+#include "src/core/lib/iomgr/tcp_server.h"
+#include "src/core/lib/iomgr/timer.h"
+
+extern grpc_tcp_client_vtable grpc_posix_tcp_client_vtable;
+extern grpc_timer_vtable grpc_generic_timer_vtable;
+extern grpc_pollset_vtable grpc_posix_pollset_vtable;
+extern grpc_pollset_set_vtable grpc_posix_pollset_set_vtable;
+extern grpc_address_resolver_vtable grpc_posix_resolver_vtable;
+
+static void iomgr_platform_init(void) {
+  grpc_wakeup_fd_global_init();
+  grpc_event_engine_init();
+}
+
+static void iomgr_platform_flush(void) {}
+
+static void iomgr_platform_shutdown(void) {
+  grpc_event_engine_shutdown();
+  grpc_wakeup_fd_global_destroy();
+}
+
+static grpc_iomgr_platform_vtable vtable = {
+    iomgr_platform_init, iomgr_platform_flush, iomgr_platform_shutdown};
+
+void grpc_set_default_iomgr_platform() {
+  grpc_set_tcp_client_impl(&grpc_posix_tcp_client_vtable);
+  grpc_set_tcp_server_impl(nullptr);
+  grpc_set_timer_impl(&grpc_generic_timer_vtable);
+  grpc_set_pollset_vtable(&grpc_posix_pollset_vtable);
+  grpc_set_pollset_set_vtable(&grpc_posix_pollset_set_vtable);
+  grpc_set_resolver_impl(&grpc_posix_resolver_vtable);
+  grpc_set_iomgr_platform_vtable(&vtable);
+}
+
+#endif /* GRPC_CFSTREAM_IOMGR */
diff --git a/src/core/lib/iomgr/iomgr_cfstream.h b/src/core/lib/iomgr/iomgr_cfstream.h
new file mode 100644
index 0000000000..19bc859bd5
--- /dev/null
+++ b/src/core/lib/iomgr/iomgr_cfstream.h
@@ -0,0 +1,26 @@
+/*
+ *
+ * Copyright 2018 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.
+ *
+ */
+
+#ifndef GRPC_CORE_LIB_IOMGR_IOMGR_CFSTREAM_H
+#define GRPC_CORE_LIB_IOMGR_IOMGR_CFSTREAM_H
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/iomgr/iomgr_internal.h"
+
+#endif /* GRPC_CORE_LIB_IOMGR_IOMGR_CFSTREAM_H */
diff --git a/src/core/lib/iomgr/iomgr_posix.cc b/src/core/lib/iomgr/iomgr_posix.cc
index 66c9cb7ff7..ca7334c9a4 100644
--- a/src/core/lib/iomgr/iomgr_posix.cc
+++ b/src/core/lib/iomgr/iomgr_posix.cc
@@ -20,7 +20,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_IOMGR
 
 #include "src/core/lib/debug/trace.h"
 #include "src/core/lib/iomgr/ev_posix.h"
@@ -64,4 +64,4 @@ void grpc_set_default_iomgr_platform() {
   grpc_set_iomgr_platform_vtable(&vtable);
 }
 
-#endif /* GRPC_POSIX_SOCKET */
+#endif /* GRPC_POSIX_SOCKET_IOMGR */
diff --git a/src/core/lib/iomgr/polling_entity.cc b/src/core/lib/iomgr/polling_entity.cc
index 9f164f65b0..651488d0f1 100644
--- a/src/core/lib/iomgr/polling_entity.cc
+++ b/src/core/lib/iomgr/polling_entity.cc
@@ -61,8 +61,9 @@ bool grpc_polling_entity_is_empty(const grpc_polling_entity* pollent) {
 void grpc_polling_entity_add_to_pollset_set(grpc_polling_entity* pollent,
                                             grpc_pollset_set* pss_dst) {
   if (pollent->tag == GRPC_POLLS_POLLSET) {
-    GPR_ASSERT(pollent->pollent.pollset != nullptr);
-    grpc_pollset_set_add_pollset(pss_dst, pollent->pollent.pollset);
+    if (pollent->pollent.pollset != nullptr) {
+      grpc_pollset_set_add_pollset(pss_dst, pollent->pollent.pollset);
+    }
   } else if (pollent->tag == GRPC_POLLS_POLLSET_SET) {
     GPR_ASSERT(pollent->pollent.pollset_set != nullptr);
     grpc_pollset_set_add_pollset_set(pss_dst, pollent->pollent.pollset_set);
@@ -75,8 +76,9 @@ void grpc_polling_entity_add_to_pollset_set(grpc_polling_entity* pollent,
 void grpc_polling_entity_del_from_pollset_set(grpc_polling_entity* pollent,
                                               grpc_pollset_set* pss_dst) {
   if (pollent->tag == GRPC_POLLS_POLLSET) {
-    GPR_ASSERT(pollent->pollent.pollset != nullptr);
-    grpc_pollset_set_del_pollset(pss_dst, pollent->pollent.pollset);
+    if (pollent->pollent.pollset != nullptr) {
+      grpc_pollset_set_del_pollset(pss_dst, pollent->pollent.pollset);
+    }
   } else if (pollent->tag == GRPC_POLLS_POLLSET_SET) {
     GPR_ASSERT(pollent->pollent.pollset_set != nullptr);
     grpc_pollset_set_del_pollset_set(pss_dst, pollent->pollent.pollset_set);
diff --git a/src/core/lib/iomgr/port.h b/src/core/lib/iomgr/port.h
index a397012003..7a07c3e381 100644
--- a/src/core/lib/iomgr/port.h
+++ b/src/core/lib/iomgr/port.h
@@ -97,7 +97,23 @@
 #define GRPC_MSG_IOVLEN_TYPE int
 #define GRPC_POSIX_FORK 1
 #define GRPC_POSIX_NO_SPECIAL_WAKEUP_FD 1
+#ifdef GRPC_CFSTREAM
+#define GRPC_CFSTREAM_IOMGR 1
+#define GRPC_CFSTREAM_TCP 1
+#define GRPC_CFSTREAM_TCP_CLIENT 1
+#define GRPC_POSIX_SOCKET_EV 1
+#define GRPC_POSIX_SOCKET_EV_EPOLL1 1
+#define GRPC_POSIX_SOCKET_EV_EPOLLEX 1
+#define GRPC_POSIX_SOCKET_EV_EPOLLSIG 1
+#define GRPC_POSIX_SOCKET_EV_POLL 1
+#define GRPC_POSIX_SOCKET_RESOLVE_ADDRESS 1
+#define GRPC_POSIX_SOCKET_SOCKADDR 1
+#define GRPC_POSIX_SOCKET_SOCKET_FACTORY 1
+#define GRPC_POSIX_SOCKET_TCP_SERVER_UTILS_COMMON 1
+#define GRPC_POSIX_SOCKET_UTILS_COMMON 1
+#else
 #define GRPC_POSIX_SOCKET 1
+#endif
 #define GRPC_POSIX_SOCKETUTILS 1
 #define GRPC_POSIX_SYSCONF 1
 #define GRPC_POSIX_WAKEUP_FD 1
@@ -131,12 +147,29 @@
 #endif
 
 #if defined(GRPC_POSIX_SOCKET) + defined(GRPC_WINSOCK_SOCKET) + \
-        defined(GRPC_CUSTOM_SOCKET) !=                          \
+        defined(GRPC_CUSTOM_SOCKET) + defined(GRPC_CFSTREAM) != \
     1
 #error \
     "Must define exactly one of GRPC_POSIX_SOCKET, GRPC_WINSOCK_SOCKET, GRPC_CUSTOM_SOCKET"
 #endif
 
+#ifdef GRPC_POSIX_SOCKET
+#define GRPC_POSIX_SOCKET_EV 1
+#define GRPC_POSIX_SOCKET_EV_EPOLLEX 1
+#define GRPC_POSIX_SOCKET_EV_EPOLLSIG 1
+#define GRPC_POSIX_SOCKET_EV_POLL 1
+#define GRPC_POSIX_SOCKET_EV_EPOLL1 1
+#define GRPC_POSIX_SOCKET_IOMGR 1
+#define GRPC_POSIX_SOCKET_RESOLVE_ADDRESS 1
+#define GRPC_POSIX_SOCKET_SOCKADDR 1
+#define GRPC_POSIX_SOCKET_SOCKET_FACTORY 1
+#define GRPC_POSIX_SOCKET_TCP 1
+#define GRPC_POSIX_SOCKET_TCP_CLIENT 1
+#define GRPC_POSIX_SOCKET_TCP_SERVER 1
+#define GRPC_POSIX_SOCKET_TCP_SERVER_UTILS_COMMON 1
+#define GRPC_POSIX_SOCKET_UTILS_COMMON 1
+#endif
+
 #if defined(GRPC_POSIX_HOST_NAME_MAX) && defined(GRPC_POSIX_SYSCONF)
 #error "Cannot define both GRPC_POSIX_HOST_NAME_MAX and GRPC_POSIX_SYSCONF"
 #endif
diff --git a/src/core/lib/iomgr/resolve_address.h b/src/core/lib/iomgr/resolve_address.h
index fe0d834582..8638935060 100644
--- a/src/core/lib/iomgr/resolve_address.h
+++ b/src/core/lib/iomgr/resolve_address.h
@@ -37,6 +37,10 @@
 #include <sys/socket.h>
 #endif
 
+#ifdef GRPC_CFSTREAM
+#include <sys/socket.h>
+#endif
+
 #include "src/core/lib/iomgr/pollset_set.h"
 
 #define GRPC_MAX_SOCKADDR_SIZE 128
diff --git a/src/core/lib/iomgr/resolve_address_posix.cc b/src/core/lib/iomgr/resolve_address_posix.cc
index a82075542f..7a825643e1 100644
--- a/src/core/lib/iomgr/resolve_address_posix.cc
+++ b/src/core/lib/iomgr/resolve_address_posix.cc
@@ -19,7 +19,7 @@
 #include <grpc/support/port_platform.h>
 
 #include "src/core/lib/iomgr/port.h"
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_RESOLVE_ADDRESS
 
 #include "src/core/lib/iomgr/sockaddr.h"
 
diff --git a/src/core/lib/iomgr/sockaddr_posix.h b/src/core/lib/iomgr/sockaddr_posix.h
index 5b18bbc465..3cedd9082d 100644
--- a/src/core/lib/iomgr/sockaddr_posix.h
+++ b/src/core/lib/iomgr/sockaddr_posix.h
@@ -23,7 +23,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_SOCKADDR
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <netinet/in.h>
diff --git a/src/core/lib/iomgr/socket_factory_posix.cc b/src/core/lib/iomgr/socket_factory_posix.cc
index 1d1e36c0e3..57137769c8 100644
--- a/src/core/lib/iomgr/socket_factory_posix.cc
+++ b/src/core/lib/iomgr/socket_factory_posix.cc
@@ -20,7 +20,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_SOCKET_FACTORY
 
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/gpr/useful.h"
diff --git a/src/core/lib/iomgr/socket_utils_common_posix.cc b/src/core/lib/iomgr/socket_utils_common_posix.cc
index 04a1767731..caee652307 100644
--- a/src/core/lib/iomgr/socket_utils_common_posix.cc
+++ b/src/core/lib/iomgr/socket_utils_common_posix.cc
@@ -20,7 +20,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_UTILS_COMMON
 
 #include "src/core/lib/iomgr/socket_utils.h"
 #include "src/core/lib/iomgr/socket_utils_posix.h"
diff --git a/src/core/lib/iomgr/tcp_client_posix.cc b/src/core/lib/iomgr/tcp_client_posix.cc
index 9f19b833da..8d4c84880d 100644
--- a/src/core/lib/iomgr/tcp_client_posix.cc
+++ b/src/core/lib/iomgr/tcp_client_posix.cc
@@ -20,7 +20,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_TCP_CLIENT
 
 #include "src/core/lib/iomgr/tcp_client_posix.h"
 
diff --git a/src/core/lib/iomgr/tcp_posix.cc b/src/core/lib/iomgr/tcp_posix.cc
index 205af22531..d7dda7454b 100644
--- a/src/core/lib/iomgr/tcp_posix.cc
+++ b/src/core/lib/iomgr/tcp_posix.cc
@@ -20,7 +20,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_TCP
 
 #include "src/core/lib/iomgr/network_status_tracker.h"
 #include "src/core/lib/iomgr/tcp_posix.h"
diff --git a/src/core/lib/iomgr/tcp_server_posix.cc b/src/core/lib/iomgr/tcp_server_posix.cc
index f11b82f7ab..463eb6de95 100644
--- a/src/core/lib/iomgr/tcp_server_posix.cc
+++ b/src/core/lib/iomgr/tcp_server_posix.cc
@@ -25,7 +25,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_TCP_SERVER
 
 #include "src/core/lib/iomgr/tcp_server.h"
 
diff --git a/src/core/lib/iomgr/tcp_server_utils_posix_common.cc b/src/core/lib/iomgr/tcp_server_utils_posix_common.cc
index 9f4e58ca16..48afd926b4 100644
--- a/src/core/lib/iomgr/tcp_server_utils_posix_common.cc
+++ b/src/core/lib/iomgr/tcp_server_utils_posix_common.cc
@@ -20,7 +20,7 @@
 
 #include "src/core/lib/iomgr/port.h"
 
-#ifdef GRPC_POSIX_SOCKET
+#ifdef GRPC_POSIX_SOCKET_TCP_SERVER_UTILS_COMMON
 
 #include "src/core/lib/iomgr/tcp_server_utils_posix.h"
 
diff --git a/templates/gRPC-Core.podspec.template b/templates/gRPC-Core.podspec.template
index af97d81834..ff19aa313d 100644
--- a/templates/gRPC-Core.podspec.template
+++ b/templates/gRPC-Core.podspec.template
@@ -68,6 +68,14 @@
     excl = grpc_private_files(libs)
     return [file for file in out if not file in excl]
 
+  def cfstream_private_headers(libs):
+    out = grpc_lib_files(libs, ("grpc_cfstream",), ("headers",))
+    return out
+
+  def cfstream_private_files(libs):
+    out = grpc_lib_files(libs, ("grpc_cfstream",), ("src", "headers"))
+    return out
+
   def ruby_multiline_list(files, indent):
     return (',\n' + indent*' ').join('\'%s\'' % f for f in files)
   %>
@@ -175,6 +183,16 @@
       ss.private_header_files = ${ruby_multiline_list(grpc_private_headers(libs), 30)}
     end
 
+    s.subspec 'CFStream-Implementation' do |ss|
+      ss.header_mappings_dir = '.'
+      ss.dependency "#{s.name}/Implementation", version
+      ss.pod_target_xcconfig = {
+        'GCC_PREPROCESSOR_DEFINITIONS' => 'GRPC_CFSTREAM=1'
+      }
+      ss.source_files = ${ruby_multiline_list(cfstream_private_files(filegroups), 22)}
+      ss.private_header_files = ${ruby_multiline_list(cfstream_private_headers(filegroups), 30)}
+    end
+
     s.subspec 'Cronet-Interface' do |ss|
       ss.header_mappings_dir = 'include/grpc'
       ss.source_files = ${ruby_multiline_list(grpc_cronet_public_headers(libs), 22)}
diff --git a/templates/gRPC.podspec.template b/templates/gRPC.podspec.template
index 6616e74bd7..9e41704916 100644
--- a/templates/gRPC.podspec.template
+++ b/templates/gRPC.podspec.template
@@ -65,6 +65,16 @@
       ss.dependency 'gRPC-Core', version
     end
 
+    s.subspec 'CFStream' do |ss|
+      ss.header_mappings_dir = "#{src_dir}"
+      ss.dependency 'gRPC-Core/CFStream-Implementation', version
+      ss.dependency "#{s.name}/Main", version
+
+      ss.pod_target_xcconfig = {
+        'GCC_PREPROCESSOR_DEFINITIONS' => 'GRPC_CFSTREAM=1'
+      }
+    end
+
     s.subspec 'GID' do |ss|
       ss.ios.deployment_target = '7.0'