| /* |
| * |
| * Copyright 2016 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_CHANNEL_HANDSHAKER_H |
| #define GRPC_CORE_LIB_CHANNEL_HANDSHAKER_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <grpc/impl/codegen/grpc_types.h> |
| |
| #include "src/core/lib/iomgr/closure.h" |
| #include "src/core/lib/iomgr/endpoint.h" |
| #include "src/core/lib/iomgr/exec_ctx.h" |
| #include "src/core/lib/iomgr/tcp_server.h" |
| |
| /// Handshakers are used to perform initial handshakes on a connection |
| /// before the client sends the initial request. Some examples of what |
| /// a handshaker can be used for includes support for HTTP CONNECT on |
| /// the client side and various types of security initialization. |
| /// |
| /// In general, handshakers should be used via a handshake manager. |
| |
| /// |
| /// grpc_handshaker |
| /// |
| |
| typedef struct grpc_handshaker grpc_handshaker; |
| |
| /// Arguments passed through handshakers and to the on_handshake_done callback. |
| /// |
| /// For handshakers, all members are input/output parameters; for |
| /// example, a handshaker may read from or write to \a endpoint and |
| /// then later replace it with a wrapped endpoint. Similarly, a |
| /// handshaker may modify \a args. |
| /// |
| /// A handshaker takes ownership of the members while a handshake is in |
| /// progress. Upon failure or shutdown of an in-progress handshaker, |
| /// the handshaker is responsible for destroying the members and setting |
| /// them to NULL before invoking the on_handshake_done callback. |
| /// |
| /// For the on_handshake_done callback, all members are input arguments, |
| /// which the callback takes ownership of. |
| typedef struct { |
| grpc_endpoint* endpoint; |
| grpc_channel_args* args; |
| grpc_slice_buffer* read_buffer; |
| // A handshaker may set this to true before invoking on_handshake_done |
| // to indicate that subsequent handshakers should be skipped. |
| bool exit_early; |
| // User data passed through the handshake manager. Not used by |
| // individual handshakers. |
| void* user_data; |
| } grpc_handshaker_args; |
| |
| typedef struct { |
| /// Destroys the handshaker. |
| void (*destroy)(grpc_handshaker* handshaker); |
| |
| /// Shuts down the handshaker (e.g., to clean up when the operation is |
| /// aborted in the middle). |
| void (*shutdown)(grpc_handshaker* handshaker, grpc_error* why); |
| |
| /// Performs handshaking, modifying \a args as needed (e.g., to |
| /// replace \a endpoint with a wrapped endpoint). |
| /// When finished, invokes \a on_handshake_done. |
| /// \a acceptor will be NULL for client-side handshakers. |
| void (*do_handshake)(grpc_handshaker* handshaker, |
| grpc_tcp_server_acceptor* acceptor, |
| grpc_closure* on_handshake_done, |
| grpc_handshaker_args* args); |
| |
| /// The name of the handshaker, for debugging purposes. |
| const char* name; |
| } grpc_handshaker_vtable; |
| |
| /// Base struct. To subclass, make this the first member of the |
| /// implementation struct. |
| struct grpc_handshaker { |
| const grpc_handshaker_vtable* vtable; |
| }; |
| |
| /// Called by concrete implementations to initialize the base struct. |
| void grpc_handshaker_init(const grpc_handshaker_vtable* vtable, |
| grpc_handshaker* handshaker); |
| |
| void grpc_handshaker_destroy(grpc_handshaker* handshaker); |
| void grpc_handshaker_shutdown(grpc_handshaker* handshaker, grpc_error* why); |
| void grpc_handshaker_do_handshake(grpc_handshaker* handshaker, |
| grpc_tcp_server_acceptor* acceptor, |
| grpc_closure* on_handshake_done, |
| grpc_handshaker_args* args); |
| const char* grpc_handshaker_name(grpc_handshaker* handshaker); |
| |
| /// |
| /// grpc_handshake_manager |
| /// |
| |
| typedef struct grpc_handshake_manager grpc_handshake_manager; |
| |
| /// Creates a new handshake manager. Caller takes ownership. |
| grpc_handshake_manager* grpc_handshake_manager_create(); |
| |
| /// Adds a handshaker to the handshake manager. |
| /// Takes ownership of \a handshaker. |
| void grpc_handshake_manager_add(grpc_handshake_manager* mgr, |
| grpc_handshaker* handshaker); |
| |
| /// Destroys the handshake manager. |
| void grpc_handshake_manager_destroy(grpc_handshake_manager* mgr); |
| |
| /// Shuts down the handshake manager (e.g., to clean up when the operation is |
| /// aborted in the middle). |
| /// The caller must still call grpc_handshake_manager_destroy() after |
| /// calling this function. |
| void grpc_handshake_manager_shutdown(grpc_handshake_manager* mgr, |
| grpc_error* why); |
| |
| /// Invokes handshakers in the order they were added. |
| /// Takes ownership of \a endpoint, and then passes that ownership to |
| /// the \a on_handshake_done callback. |
| /// Does NOT take ownership of \a channel_args. Instead, makes a copy before |
| /// invoking the first handshaker. |
| /// \a acceptor will be nullptr for client-side handshakers. |
| /// |
| /// When done, invokes \a on_handshake_done with a grpc_handshaker_args |
| /// object as its argument. If the callback is invoked with error != |
| /// GRPC_ERROR_NONE, then handshaking failed and the handshaker has done |
| /// the necessary clean-up. Otherwise, the callback takes ownership of |
| /// the arguments. |
| void grpc_handshake_manager_do_handshake(grpc_handshake_manager* mgr, |
| grpc_endpoint* endpoint, |
| const grpc_channel_args* channel_args, |
| grpc_millis deadline, |
| grpc_tcp_server_acceptor* acceptor, |
| grpc_iomgr_cb_func on_handshake_done, |
| void* user_data); |
| |
| /// Add \a mgr to the server side list of all pending handshake managers, the |
| /// list starts with \a *head. |
| // Not thread-safe. Caller needs to synchronize. |
| void grpc_handshake_manager_pending_list_add(grpc_handshake_manager** head, |
| grpc_handshake_manager* mgr); |
| |
| /// Remove \a mgr from the server side list of all pending handshake managers. |
| // Not thread-safe. Caller needs to synchronize. |
| void grpc_handshake_manager_pending_list_remove(grpc_handshake_manager** head, |
| grpc_handshake_manager* mgr); |
| |
| /// Shutdown all pending handshake managers on the server side. |
| // Not thread-safe. Caller needs to synchronize. |
| void grpc_handshake_manager_pending_list_shutdown_all( |
| grpc_handshake_manager* head, grpc_error* why); |
| |
| #endif /* GRPC_CORE_LIB_CHANNEL_HANDSHAKER_H */ |