Pass exec_ctx in TSI zero_copy_protector create

src/core/lib/security/transport/security_handshaker.c

@@ -137,7 +137,7 @@ static void on_peer_checked_inner(grpc_exec_ctx *exec_ctx,
   // Create zero-copy frame protector, if implemented.
   tsi_zero_copy_grpc_protector *zero_copy_protector = NULL;
   tsi_result result = tsi_handshaker_result_create_zero_copy_grpc_protector(
-      h->handshaker_result, NULL, &zero_copy_protector);
+      exec_ctx, h->handshaker_result, NULL, &zero_copy_protector);
   if (result != TSI_OK && result != TSI_UNIMPLEMENTED) {
     error = grpc_set_tsi_error_result(
         GRPC_ERROR_CREATE_FROM_STATIC_STRING(

src/core/tsi/fake_transport_security.c

@@ -493,7 +493,8 @@ static tsi_result fake_handshaker_result_extract_peer(
 }
 
 static tsi_result fake_handshaker_result_create_zero_copy_grpc_protector(
-    const tsi_handshaker_result *self, size_t *max_output_protected_frame_size,
+    void *exec_ctx, const tsi_handshaker_result *self,
+    size_t *max_output_protected_frame_size,
     tsi_zero_copy_grpc_protector **protector) {
   *protector =
       tsi_create_fake_zero_copy_grpc_protector(max_output_protected_frame_size);

src/core/tsi/transport_security.h

@@ -84,11 +84,17 @@ struct tsi_handshaker {
 };
 
 /* Base for tsi_handshaker_result implementations.
-   See transport_security_interface.h for documentation. */
+   See transport_security_interface.h for documentation.
+   The exec_ctx parameter in create_zero_copy_grpc_protector is supposed to be
+   of type grpc_exec_ctx*, but we're using void* instead to avoid making the TSI
+   API depend on grpc. The create_zero_copy_grpc_protector() method is only used
+   in grpc, where we do need the exec_ctx passed through, but the API still
+   needs to compile in other applications, where grpc_exec_ctx is not defined.
+*/
 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,
+      void *exec_ctx, 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,

src/core/tsi/transport_security_grpc.c

@@ -20,16 +20,18 @@
 
 /* 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_output_protected_frame_size,
+    grpc_exec_ctx *exec_ctx, const tsi_handshaker_result *self,
+    size_t *max_output_protected_frame_size,
     tsi_zero_copy_grpc_protector **protector) {
-  if (self == NULL || self->vtable == NULL || protector == NULL) {
+  if (exec_ctx == NULL || 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_output_protected_frame_size, protector);
+      exec_ctx, self, max_output_protected_frame_size, protector);
 }
 
 /* --- tsi_zero_copy_grpc_protector common implementation. ---

src/core/tsi/transport_security_grpc.h

@@ -30,7 +30,8 @@ extern "C" {
    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,
+    grpc_exec_ctx *exec_ctx, const tsi_handshaker_result *self,
+    size_t *max_output_protected_frame_size,
     tsi_zero_copy_grpc_protector **protector);
 
 /* -- tsi_zero_copy_grpc_protector object --  */