Revert "Add TSI zero-copy frame protector"

8 files changed, 53 insertions, 201 deletions

diff --git a/src/core/tsi/fake_transport_security.c b/src/core/tsi/fake_transport_security.c
index de16b356b6..810447313c 100644
--- a/src/core/tsi/fake_transport_security.c
+++ b/src/core/tsi/fake_transport_security.c
@@ -407,10 +407,8 @@ static void fake_handshaker_result_destroy(tsi_handshaker_result *self) {
 
 static const tsi_handshaker_result_vtable handshaker_result_vtable = {
     fake_handshaker_result_extract_peer,
-    NULL, /* create_zero_copy_grpc_protector */
     fake_handshaker_result_create_frame_protector,
-    fake_handshaker_result_get_unused_bytes,
-    fake_handshaker_result_destroy,
+    fake_handshaker_result_get_unused_bytes, fake_handshaker_result_destroy,
 };
 
 static tsi_result fake_handshaker_result_create(
diff --git a/src/core/tsi/transport_security.c b/src/core/tsi/transport_security.c
index 3637f3c190..2b1f4310c1 100644
--- a/src/core/tsi/transport_security.c
+++ b/src/core/tsi/transport_security.c
@@ -74,12 +74,14 @@ tsi_result tsi_frame_protector_protect(tsi_frame_protector *self,
                                        size_t *unprotected_bytes_size,
                                        unsigned char *protected_output_frames,
                                        size_t *protected_output_frames_size) {
-  if (self == NULL || self->vtable == NULL || unprotected_bytes == NULL ||
+  if (self == NULL || unprotected_bytes == NULL ||
       unprotected_bytes_size == NULL || protected_output_frames == NULL ||
       protected_output_frames_size == NULL) {
     return TSI_INVALID_ARGUMENT;
   }
-  if (self->vtable->protect == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->protect == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->protect(self, unprotected_bytes, unprotected_bytes_size,
                                protected_output_frames,
                                protected_output_frames_size);
@@ -88,11 +90,13 @@ tsi_result tsi_frame_protector_protect(tsi_frame_protector *self,
 tsi_result tsi_frame_protector_protect_flush(
     tsi_frame_protector *self, unsigned char *protected_output_frames,
     size_t *protected_output_frames_size, size_t *still_pending_size) {
-  if (self == NULL || self->vtable == NULL || protected_output_frames == NULL ||
+  if (self == NULL || protected_output_frames == NULL ||
       protected_output_frames_size == NULL || still_pending_size == NULL) {
     return TSI_INVALID_ARGUMENT;
   }
-  if (self->vtable->protect_flush == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->protect_flush == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->protect_flush(self, protected_output_frames,
                                      protected_output_frames_size,
                                      still_pending_size);
@@ -102,12 +106,14 @@ tsi_result tsi_frame_protector_unprotect(
     tsi_frame_protector *self, const unsigned char *protected_frames_bytes,
     size_t *protected_frames_bytes_size, unsigned char *unprotected_bytes,
     size_t *unprotected_bytes_size) {
-  if (self == NULL || self->vtable == NULL || protected_frames_bytes == NULL ||
+  if (self == NULL || protected_frames_bytes == NULL ||
       protected_frames_bytes_size == NULL || unprotected_bytes == NULL ||
       unprotected_bytes_size == NULL) {
     return TSI_INVALID_ARGUMENT;
   }
-  if (self->vtable->unprotect == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->unprotect == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->unprotect(self, protected_frames_bytes,
                                  protected_frames_bytes_size, unprotected_bytes,
                                  unprotected_bytes_size);
@@ -125,44 +131,48 @@ void tsi_frame_protector_destroy(tsi_frame_protector *self) {
 tsi_result tsi_handshaker_get_bytes_to_send_to_peer(tsi_handshaker *self,
                                                     unsigned char *bytes,
                                                     size_t *bytes_size) {
-  if (self == NULL || self->vtable == NULL || bytes == NULL ||
-      bytes_size == NULL) {
+  if (self == NULL || bytes == NULL || bytes_size == NULL) {
     return TSI_INVALID_ARGUMENT;
   }
   if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
-  if (self->vtable->get_bytes_to_send_to_peer == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->get_bytes_to_send_to_peer == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->get_bytes_to_send_to_peer(self, bytes, bytes_size);
 }
 
 tsi_result tsi_handshaker_process_bytes_from_peer(tsi_handshaker *self,
                                                   const unsigned char *bytes,
                                                   size_t *bytes_size) {
-  if (self == NULL || self->vtable == NULL || bytes == NULL ||
-      bytes_size == NULL) {
+  if (self == NULL || bytes == NULL || bytes_size == NULL) {
     return TSI_INVALID_ARGUMENT;
   }
   if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
-  if (self->vtable->process_bytes_from_peer == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->process_bytes_from_peer == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->process_bytes_from_peer(self, bytes, bytes_size);
 }
 
 tsi_result tsi_handshaker_get_result(tsi_handshaker *self) {
-  if (self == NULL || self->vtable == NULL) return TSI_INVALID_ARGUMENT;
+  if (self == NULL) return TSI_INVALID_ARGUMENT;
   if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
-  if (self->vtable->get_result == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->get_result == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->get_result(self);
 }
 
 tsi_result tsi_handshaker_extract_peer(tsi_handshaker *self, tsi_peer *peer) {
-  if (self == NULL || self->vtable == NULL || peer == NULL) {
-    return TSI_INVALID_ARGUMENT;
-  }
+  if (self == NULL || peer == NULL) return TSI_INVALID_ARGUMENT;
   memset(peer, 0, sizeof(tsi_peer));
   if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
   if (tsi_handshaker_get_result(self) != TSI_OK) {
     return TSI_FAILED_PRECONDITION;
   }
-  if (self->vtable->extract_peer == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->extract_peer == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->extract_peer(self, peer);
 }
 
@@ -170,12 +180,14 @@ tsi_result tsi_handshaker_create_frame_protector(
     tsi_handshaker *self, size_t *max_protected_frame_size,
     tsi_frame_protector **protector) {
   tsi_result result;
-  if (self == NULL || self->vtable == NULL || protector == NULL) {
-    return TSI_INVALID_ARGUMENT;
-  }
+  if (self == NULL || protector == NULL) return TSI_INVALID_ARGUMENT;
   if (self->frame_protector_created) return TSI_FAILED_PRECONDITION;
-  if (tsi_handshaker_get_result(self) != TSI_OK) return TSI_FAILED_PRECONDITION;
-  if (self->vtable->create_frame_protector == NULL) return TSI_UNIMPLEMENTED;
+  if (tsi_handshaker_get_result(self) != TSI_OK) {
+    return TSI_FAILED_PRECONDITION;
+  }
+  if (self->vtable == NULL || self->vtable->create_frame_protector == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   result = self->vtable->create_frame_protector(self, max_protected_frame_size,
                                                 protector);
   if (result == TSI_OK) {
@@ -189,9 +201,11 @@ tsi_result tsi_handshaker_next(
     size_t received_bytes_size, unsigned char **bytes_to_send,
     size_t *bytes_to_send_size, tsi_handshaker_result **handshaker_result,
     tsi_handshaker_on_next_done_cb cb, void *user_data) {
-  if (self == NULL || self->vtable == NULL) return TSI_INVALID_ARGUMENT;
+  if (self == NULL) return TSI_INVALID_ARGUMENT;
   if (self->handshaker_result_created) return TSI_FAILED_PRECONDITION;
-  if (self->vtable->next == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->next == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->next(self, received_bytes, received_bytes_size,
                             bytes_to_send, bytes_to_send_size,
                             handshaker_result, cb, user_data);
@@ -206,21 +220,21 @@ void tsi_handshaker_destroy(tsi_handshaker *self) {
 
 tsi_result tsi_handshaker_result_extract_peer(const tsi_handshaker_result *self,
                                               tsi_peer *peer) {
-  if (self == NULL || self->vtable == NULL || peer == NULL) {
-    return TSI_INVALID_ARGUMENT;
-  }
+  if (self == NULL || peer == NULL) return TSI_INVALID_ARGUMENT;
   memset(peer, 0, sizeof(tsi_peer));
-  if (self->vtable->extract_peer == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->extract_peer == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->extract_peer(self, peer);
 }
 
 tsi_result tsi_handshaker_result_create_frame_protector(
     const tsi_handshaker_result *self, size_t *max_protected_frame_size,
     tsi_frame_protector **protector) {
-  if (self == NULL || self->vtable == NULL || protector == NULL) {
-    return TSI_INVALID_ARGUMENT;
+  if (self == NULL || protector == NULL) return TSI_INVALID_ARGUMENT;
+  if (self->vtable == NULL || self->vtable->create_frame_protector == NULL) {
+    return TSI_UNIMPLEMENTED;
   }
-  if (self->vtable->create_frame_protector == NULL) return TSI_UNIMPLEMENTED;
   return self->vtable->create_frame_protector(self, max_protected_frame_size,
                                               protector);
 }
@@ -228,11 +242,12 @@ tsi_result tsi_handshaker_result_create_frame_protector(
 tsi_result tsi_handshaker_result_get_unused_bytes(
     const tsi_handshaker_result *self, const unsigned char **bytes,
     size_t *bytes_size) {
-  if (self == NULL || self->vtable == NULL || bytes == NULL ||
-      bytes_size == NULL) {
+  if (self == NULL || bytes == NULL || bytes_size == NULL) {
     return TSI_INVALID_ARGUMENT;
   }
-  if (self->vtable->get_unused_bytes == NULL) return TSI_UNIMPLEMENTED;
+  if (self->vtable == NULL || self->vtable->get_unused_bytes == NULL) {
+    return TSI_UNIMPLEMENTED;
+  }
   return self->vtable->get_unused_bytes(self, bytes, bytes_size);
 }
 
diff --git a/src/core/tsi/transport_security.h b/src/core/tsi/transport_security.h
index dde48a6b7f..2c7db6bca9 100644
--- a/src/core/tsi/transport_security.h
+++ b/src/core/tsi/transport_security.h
@@ -86,10 +86,6 @@ struct tsi_handshaker {
    See transport_security_interface.h for documentation. */
 typedef struct {
   tsi_result (*extract_peer)(const tsi_handshaker_result *self, tsi_peer *peer);
-  tsi_result (*create_zero_copy_grpc_protector)(
-      const tsi_handshaker_result *self,
-      size_t *max_output_protected_frame_size,
-      tsi_zero_copy_grpc_protector **protector);
   tsi_result (*create_frame_protector)(const tsi_handshaker_result *self,
                                        size_t *max_output_protected_frame_size,
                                        tsi_frame_protector **protector);
diff --git a/src/core/tsi/transport_security_adapter.c b/src/core/tsi/transport_security_adapter.c
index 3b388af48a..b6dc660c47 100644
--- a/src/core/tsi/transport_security_adapter.c
+++ b/src/core/tsi/transport_security_adapter.c
@@ -66,11 +66,8 @@ static void adapter_result_destroy(tsi_handshaker_result *self) {
 }
 
 static const tsi_handshaker_result_vtable result_vtable = {
-    adapter_result_extract_peer,
-    NULL, /* create_zero_copy_grpc_protector */
-    adapter_result_create_frame_protector,
-    adapter_result_get_unused_bytes,
-    adapter_result_destroy,
+    adapter_result_extract_peer, adapter_result_create_frame_protector,
+    adapter_result_get_unused_bytes, adapter_result_destroy,
 };
 
 /* Ownership of wrapped tsi_handshaker is transferred to the result object.  */
diff --git a/src/core/tsi/transport_security_grpc.c b/src/core/tsi/transport_security_grpc.c
deleted file mode 100644
index ab2b6ddd54..0000000000
--- a/src/core/tsi/transport_security_grpc.c
+++ /dev/null
@@ -1,64 +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.
- *
- */
-
-#include "src/core/tsi/transport_security_grpc.h"
-
-/* This method creates a tsi_zero_copy_grpc_protector object.  */
-tsi_result tsi_handshaker_result_create_zero_copy_grpc_protector(
-    const tsi_handshaker_result *self, size_t *max_protected_frame_size,
-    tsi_zero_copy_grpc_protector **protector) {
-  if (self == NULL || self->vtable == NULL || protector == NULL) {
-    return TSI_INVALID_ARGUMENT;
-  }
-  if (self->vtable->create_zero_copy_grpc_protector == NULL) {
-    return TSI_UNIMPLEMENTED;
-  }
-  return self->vtable->create_zero_copy_grpc_protector(
-      self, max_protected_frame_size, protector);
-}
-
-/* --- tsi_zero_copy_grpc_protector common implementation. ---
-
-   Calls specific implementation after state/input validation. */
-
-tsi_result tsi_zero_copy_grpc_protector_protect(
-    tsi_zero_copy_grpc_protector *self, grpc_slice_buffer *unprotected_slices,
-    grpc_slice_buffer *protected_slices) {
-  if (self == NULL || self->vtable == NULL || unprotected_slices == NULL ||
-      protected_slices == NULL) {
-    return TSI_INVALID_ARGUMENT;
-  }
-  if (self->vtable->protect == NULL) return TSI_UNIMPLEMENTED;
-  return self->vtable->protect(self, unprotected_slices, protected_slices);
-}
-
-tsi_result tsi_zero_copy_grpc_protector_unprotect(
-    tsi_zero_copy_grpc_protector *self, grpc_slice_buffer *protected_slices,
-    grpc_slice_buffer *unprotected_slices) {
-  if (self == NULL || self->vtable == NULL || protected_slices == NULL ||
-      unprotected_slices == NULL) {
-    return TSI_INVALID_ARGUMENT;
-  }
-  if (self->vtable->unprotect == NULL) return TSI_UNIMPLEMENTED;
-  return self->vtable->unprotect(self, protected_slices, unprotected_slices);
-}
-
-void tsi_zero_copy_grpc_protector_destroy(tsi_zero_copy_grpc_protector *self) {
-  if (self == NULL) return;
-  self->vtable->destroy(self);
-}
diff --git a/src/core/tsi/transport_security_grpc.h b/src/core/tsi/transport_security_grpc.h
deleted file mode 100644
index 5ab5297cc4..0000000000
--- a/src/core/tsi/transport_security_grpc.h
+++ /dev/null
@@ -1,80 +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.
- *
- */
-
-#ifndef GRPC_CORE_TSI_TRANSPORT_SECURITY_GRPC_H
-#define GRPC_CORE_TSI_TRANSPORT_SECURITY_GRPC_H
-
-#include <grpc/slice_buffer.h>
-#include "src/core/tsi/transport_security.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* This method creates a tsi_zero_copy_grpc_protector object. It return TSI_OK
-   assuming there is no fatal error.
-   The caller is responsible for destroying the protector.  */
-tsi_result tsi_handshaker_result_create_zero_copy_grpc_protector(
-    const tsi_handshaker_result *self, size_t *max_output_protected_frame_size,
-    tsi_zero_copy_grpc_protector **protector);
-
-/* -- tsi_zero_copy_grpc_protector object --  */
-
-/* Outputs protected frames.
-   - unprotected_slices is the unprotected data to be protected.
-   - protected_slices is the protected output frames. One or more frames
-     may be produced in this protect function.
-   - This method returns TSI_OK in case of success or a specific error code in
-     case of failure.  */
-tsi_result tsi_zero_copy_grpc_protector_protect(
-    tsi_zero_copy_grpc_protector *self, grpc_slice_buffer *unprotected_slices,
-    grpc_slice_buffer *protected_slices);
-
-/* Outputs unprotected bytes.
-   - protected_slices is the bytes of protected frames.
-   - unprotected_slices is the unprotected output data.
-   - This method returns TSI_OK in case of success. Success includes cases where
-     there is not enough data to output in which case unprotected_slices has 0
-     bytes.  */
-tsi_result tsi_zero_copy_grpc_protector_unprotect(
-    tsi_zero_copy_grpc_protector *self, grpc_slice_buffer *protected_slices,
-    grpc_slice_buffer *unprotected_slices);
-
-/* Destroys the tsi_zero_copy_grpc_protector object.  */
-void tsi_zero_copy_grpc_protector_destroy(tsi_zero_copy_grpc_protector *self);
-
-/* Base for tsi_zero_copy_grpc_protector implementations.  */
-typedef struct {
-  tsi_result (*protect)(tsi_zero_copy_grpc_protector *self,
-                        grpc_slice_buffer *unprotected_slices,
-                        grpc_slice_buffer *protected_slices);
-  tsi_result (*unprotect)(tsi_zero_copy_grpc_protector *self,
-                          grpc_slice_buffer *protected_slices,
-                          grpc_slice_buffer *unprotected_slices);
-  void (*destroy)(tsi_zero_copy_grpc_protector *self);
-} tsi_zero_copy_grpc_protector_vtable;
-
-struct tsi_zero_copy_grpc_protector {
-  const tsi_zero_copy_grpc_protector_vtable *vtable;
-};
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* GRPC_CORE_TSI_TRANSPORT_SECURITY_GRPC_H */
diff --git a/src/core/tsi/transport_security_interface.h b/src/core/tsi/transport_security_interface.h
index 414c78603f..39ba8addc4 100644
--- a/src/core/tsi/transport_security_interface.h
+++ b/src/core/tsi/transport_security_interface.h
@@ -62,15 +62,6 @@ const char *tsi_result_to_string(tsi_result result);
 
 extern grpc_tracer_flag tsi_tracing_enabled;
 
-/* -- tsi_zero_copy_grpc_protector object --
-
-  This object protects and unprotects grpc slice buffers with zero or minimized
-  memory copy once the handshake is done. Implementations of this object must be
-  thread compatible. This object depends on grpc and the details of this object
-  is defined in transport_security_grpc.h.  */
-
-typedef struct tsi_zero_copy_grpc_protector tsi_zero_copy_grpc_protector;
-
 /* --- tsi_frame_protector object ---
 
   This object protects and unprotects buffers once the handshake is done.
diff --git a/src/python/grpcio/grpc_core_dependencies.py b/src/python/grpcio/grpc_core_dependencies.py
index dc4d28f95b..e52d43e81d 100644
--- a/src/python/grpcio/grpc_core_dependencies.py
+++ b/src/python/grpcio/grpc_core_dependencies.py
@@ -246,7 +246,6 @@ CORE_SOURCE_FILES = [
   'src/core/tsi/fake_transport_security.c',
   'src/core/tsi/gts_transport_security.c',
   'src/core/tsi/ssl_transport_security.c',
-  'src/core/tsi/transport_security_grpc.c',
   'src/core/tsi/transport_security.c',
   'src/core/tsi/transport_security_adapter.c',
   'src/core/ext/transport/chttp2/server/chttp2_server.c',