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/*
*
* 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_CHANNEL_STACK_BUILDER_H
#define GRPC_CORE_LIB_CHANNEL_CHANNEL_STACK_BUILDER_H
#include <stdbool.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/channel_stack.h"
#ifdef __cplusplus
extern "C" {
#endif
/// grpc_channel_stack_builder offers a programmatic interface to selected
/// and order channel filters
typedef struct grpc_channel_stack_builder grpc_channel_stack_builder;
typedef struct grpc_channel_stack_builder_iterator
grpc_channel_stack_builder_iterator;
/// Create a new channel stack builder
grpc_channel_stack_builder *grpc_channel_stack_builder_create(void);
/// Assign a name to the channel stack: \a name must be statically allocated
void grpc_channel_stack_builder_set_name(grpc_channel_stack_builder *builder,
const char *name);
/// Set the target uri
void grpc_channel_stack_builder_set_target(grpc_channel_stack_builder *b,
const char *target);
const char *grpc_channel_stack_builder_get_target(
grpc_channel_stack_builder *b);
/// Attach \a transport to the builder (does not take ownership)
void grpc_channel_stack_builder_set_transport(
grpc_channel_stack_builder *builder, grpc_transport *transport);
/// Fetch attached transport
grpc_transport *grpc_channel_stack_builder_get_transport(
grpc_channel_stack_builder *builder);
/// Set channel arguments: copies args
void grpc_channel_stack_builder_set_channel_arguments(
grpc_exec_ctx *exec_ctx, grpc_channel_stack_builder *builder,
const grpc_channel_args *args);
/// Return a borrowed pointer to the channel arguments
const grpc_channel_args *grpc_channel_stack_builder_get_channel_arguments(
grpc_channel_stack_builder *builder);
/// Begin iterating over already defined filters in the builder at the beginning
grpc_channel_stack_builder_iterator *
grpc_channel_stack_builder_create_iterator_at_first(
grpc_channel_stack_builder *builder);
/// Begin iterating over already defined filters in the builder at the end
grpc_channel_stack_builder_iterator *
grpc_channel_stack_builder_create_iterator_at_last(
grpc_channel_stack_builder *builder);
/// Is an iterator at the first element?
bool grpc_channel_stack_builder_iterator_is_first(
grpc_channel_stack_builder_iterator *iterator);
/// Is an iterator at the end?
bool grpc_channel_stack_builder_iterator_is_end(
grpc_channel_stack_builder_iterator *iterator);
/// What is the name of the filter at this iterator position?
const char *grpc_channel_stack_builder_iterator_filter_name(
grpc_channel_stack_builder_iterator *iterator);
/// Move an iterator to the next item
bool grpc_channel_stack_builder_move_next(
grpc_channel_stack_builder_iterator *iterator);
/// Move an iterator to the previous item
bool grpc_channel_stack_builder_move_prev(
grpc_channel_stack_builder_iterator *iterator);
/// Return an iterator at \a filter_name, or at the end of the list if not
/// found.
grpc_channel_stack_builder_iterator *grpc_channel_stack_builder_iterator_find(
grpc_channel_stack_builder *builder, const char *filter_name);
typedef void (*grpc_post_filter_create_init_func)(
grpc_channel_stack *channel_stack, grpc_channel_element *elem, void *arg);
/// Add \a filter to the stack, after \a iterator.
/// Call \a post_init_func(..., \a user_data) once the channel stack is
/// created.
bool grpc_channel_stack_builder_add_filter_after(
grpc_channel_stack_builder_iterator *iterator,
const grpc_channel_filter *filter,
grpc_post_filter_create_init_func post_init_func,
void *user_data) GRPC_MUST_USE_RESULT;
/// Add \a filter to the stack, before \a iterator.
/// Call \a post_init_func(..., \a user_data) once the channel stack is
/// created.
bool grpc_channel_stack_builder_add_filter_before(
grpc_channel_stack_builder_iterator *iterator,
const grpc_channel_filter *filter,
grpc_post_filter_create_init_func post_init_func,
void *user_data) GRPC_MUST_USE_RESULT;
/// Add \a filter to the beginning of the filter list.
/// Call \a post_init_func(..., \a user_data) once the channel stack is
/// created.
bool grpc_channel_stack_builder_prepend_filter(
grpc_channel_stack_builder *builder, const grpc_channel_filter *filter,
grpc_post_filter_create_init_func post_init_func,
void *user_data) GRPC_MUST_USE_RESULT;
/// Add \a filter to the end of the filter list.
/// Call \a post_init_func(..., \a user_data) once the channel stack is
/// created.
bool grpc_channel_stack_builder_append_filter(
grpc_channel_stack_builder *builder, const grpc_channel_filter *filter,
grpc_post_filter_create_init_func post_init_func,
void *user_data) GRPC_MUST_USE_RESULT;
/// Remove any filter whose name is \a filter_name from \a builder. Returns true
/// if \a filter_name was not found.
bool grpc_channel_stack_builder_remove_filter(
grpc_channel_stack_builder *builder, const char *filter_name);
/// Terminate iteration and destroy \a iterator
void grpc_channel_stack_builder_iterator_destroy(
grpc_channel_stack_builder_iterator *iterator);
/// Destroy the builder, return the freshly minted channel stack in \a result.
/// Allocates \a prefix_bytes bytes before the channel stack
/// Returns the base pointer of the allocated block
/// \a initial_refs, \a destroy, \a destroy_arg are as per
/// grpc_channel_stack_init
grpc_error *grpc_channel_stack_builder_finish(
grpc_exec_ctx *exec_ctx, grpc_channel_stack_builder *builder,
size_t prefix_bytes, int initial_refs, grpc_iomgr_cb_func destroy,
void *destroy_arg, void **result);
/// Destroy the builder without creating a channel stack
void grpc_channel_stack_builder_destroy(grpc_exec_ctx *exec_ctx,
grpc_channel_stack_builder *builder);
extern grpc_tracer_flag grpc_trace_channel_stack_builder;
#ifdef __cplusplus
}
#endif
#endif /* GRPC_CORE_LIB_CHANNEL_CHANNEL_STACK_BUILDER_H */
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