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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPC_CORE_LIB_CHANNEL_HANDSHAKER_H
#define GRPC_CORE_LIB_CHANNEL_HANDSHAKER_H
#include <grpc/impl/codegen/grpc_types.h>
#include <grpc/impl/codegen/time.h>
#include <grpc/support/slice_buffer.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;
/// Callback type invoked when a handshaker is done.
/// Takes ownership of \a args and \a read_buffer.
typedef void (*grpc_handshaker_done_cb)(grpc_exec_ctx* exec_ctx,
grpc_endpoint* endpoint,
grpc_channel_args* args,
gpr_slice_buffer* read_buffer,
void* user_data, grpc_error* error);
struct grpc_handshaker_vtable {
/// Destroys the handshaker.
void (*destroy)(grpc_exec_ctx* exec_ctx, grpc_handshaker* handshaker);
/// Shuts down the handshaker (e.g., to clean up when the operation is
/// aborted in the middle).
void (*shutdown)(grpc_exec_ctx* exec_ctx, grpc_handshaker* handshaker);
/// Performs handshaking. When finished, calls \a cb with \a user_data.
/// Takes ownership of \a args.
/// Takes ownership of \a read_buffer, which contains leftover bytes read
/// from the endpoint by the previous handshaker.
/// \a acceptor will be NULL for client-side handshakers.
void (*do_handshake)(grpc_exec_ctx* exec_ctx, grpc_handshaker* handshaker,
grpc_endpoint* endpoint, grpc_channel_args* args,
gpr_slice_buffer* read_buffer, gpr_timespec deadline,
grpc_tcp_server_acceptor* acceptor,
grpc_handshaker_done_cb cb, void* user_data);
};
/// Base struct. To subclass, make this the first member of the
/// implementation struct.
struct grpc_handshaker {
const struct grpc_handshaker_vtable* vtable;
};
/// Called by concrete implementations to initialize the base struct.
void grpc_handshaker_init(const struct grpc_handshaker_vtable* vtable,
grpc_handshaker* handshaker);
/// Convenient wrappers for invoking methods via the vtable.
/// These probably do not need to be called from anywhere but
/// grpc_handshake_manager.
void grpc_handshaker_destroy(grpc_exec_ctx* exec_ctx,
grpc_handshaker* handshaker);
void grpc_handshaker_shutdown(grpc_exec_ctx* exec_ctx,
grpc_handshaker* handshaker);
void grpc_handshaker_do_handshake(grpc_exec_ctx* exec_ctx,
grpc_handshaker* handshaker,
grpc_endpoint* endpoint,
grpc_channel_args* args,
gpr_slice_buffer* read_buffer,
gpr_timespec deadline,
grpc_tcp_server_acceptor* acceptor,
grpc_handshaker_done_cb cb, void* user_data);
///
/// 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_exec_ctx* exec_ctx,
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_exec_ctx* exec_ctx,
grpc_handshake_manager* mgr);
/// Invokes handshakers in the order they were added.
/// Does NOT take ownership of \a args. Instead, makes a copy before
/// invoking the first handshaker.
/// \a acceptor will be NULL for client-side handshakers.
/// Invokes \a cb with \a user_data after either a handshaker fails or
/// all handshakers have completed successfully.
void grpc_handshake_manager_do_handshake(
grpc_exec_ctx* exec_ctx, grpc_handshake_manager* mgr,
grpc_endpoint* endpoint, const grpc_channel_args* args,
gpr_timespec deadline, grpc_tcp_server_acceptor* acceptor,
grpc_handshaker_done_cb cb, void* user_data);
#endif /* GRPC_CORE_LIB_CHANNEL_HANDSHAKER_H */
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