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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_DEADLINE_FILTER_H
#define GRPC_CORE_LIB_CHANNEL_DEADLINE_FILTER_H
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/iomgr/timer.h"
typedef enum grpc_deadline_timer_state {
GRPC_DEADLINE_STATE_INITIAL,
GRPC_DEADLINE_STATE_PENDING,
GRPC_DEADLINE_STATE_FINISHED
} grpc_deadline_timer_state;
// State used for filters that enforce call deadlines.
// Must be the first field in the filter's call_data.
typedef struct grpc_deadline_state {
// We take a reference to the call stack for the timer callback.
grpc_call_stack* call_stack;
gpr_atm timer_state;
grpc_timer timer;
grpc_closure timer_callback;
// Closure to invoke when the call is complete.
// We use this to cancel the timer.
grpc_closure on_complete;
// The original on_complete closure, which we chain to after our own
// closure is invoked.
grpc_closure* next_on_complete;
} grpc_deadline_state;
//
// NOTE: All of these functions require that the first field in
// elem->call_data is a grpc_deadline_state.
//
void grpc_deadline_state_init(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
grpc_call_stack* call_stack);
void grpc_deadline_state_destroy(grpc_exec_ctx* exec_ctx,
grpc_call_element* elem);
// Starts the timer with the specified deadline.
// Should be called from the filter's init_call_elem() method.
void grpc_deadline_state_start(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
gpr_timespec deadline);
// Cancels the existing timer and starts a new one with new_deadline.
//
// Note: It is generally safe to call this with an earlier deadline
// value than the current one, but not the reverse. No checks are done
// to ensure that the timer callback is not invoked while it is in the
// process of being reset, which means that attempting to increase the
// deadline may result in the timer being called twice.
void grpc_deadline_state_reset(grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
gpr_timespec new_deadline);
// To be called from the client-side filter's start_transport_stream_op()
// method. Ensures that the deadline timer is cancelled when the call
// is completed.
//
// Note: It is the caller's responsibility to chain to the next filter if
// necessary after this function returns.
void grpc_deadline_state_client_start_transport_stream_op(
grpc_exec_ctx* exec_ctx, grpc_call_element* elem,
grpc_transport_stream_op* op);
// Deadline filters for direct client channels and server channels.
// Note: Deadlines for non-direct client channels are handled by the
// client_channel filter.
extern const grpc_channel_filter grpc_client_deadline_filter;
extern const grpc_channel_filter grpc_server_deadline_filter;
#endif /* GRPC_CORE_LIB_CHANNEL_DEADLINE_FILTER_H */
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