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/*
* Copyright (c) 2021-2022 Cisco and/or its affiliates.
* 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.
*/
/**
* \file request.c
* \brief Implementation of pending requests.
*/
#include <assert.h>
#include <stdlib.h>
#include <hicn/util/log.h>
#include "request.h"
const char *hc_request_state_str[] = {
#define _(x) [REQUEST_STATE_##x] = #x,
foreach_request_state
#undef _
};
struct hc_request_s {
int seq;
hc_action_t action;
hc_object_type_t object_type;
hc_object_t *object;
#if 0
int (*parse)(const uint8_t *src, uint8_t *dst);
#endif
/* Callbacks */
hc_result_callback_t callback;
void *callback_data;
/* Temp data used for the execution of the request */
hc_data_t *data;
/* Nested requests support
*
* In order to answer complex requests, involving a combination of requests to
* the forwarder, we will allow maintaining a Finite State Machine in the
* requests (and a tree of requests)
*
* The entry point for the modules will always remain the initial request,
* however, we will chain nested requests in their parent fields, and point to
* the one currently under execution in current.
* */
hc_request_state_t state;
unsigned state_count; /* Usefor for iterative requests */
hc_request_t *parent;
hc_request_t *current;
};
hc_request_t *hc_request_create(int seq, hc_action_t action,
hc_object_type_t object_type,
hc_object_t *object,
hc_result_callback_t callback,
void *callback_data) {
hc_request_t *request = malloc(sizeof(hc_request_t));
if (!request) return NULL;
request->seq = seq;
request->action = action;
request->object_type = object_type;
request->object = object;
request->callback = callback;
request->callback_data = callback_data;
request->data = NULL;
request->state = REQUEST_STATE_INIT;
request->state_count = 0;
request->parent = NULL;
request->current = NULL;
return request;
}
void hc_request_free(hc_request_t *request) { free(request); }
void hc_request_set(hc_request_t *request, hc_action_t action,
hc_object_type_t object_type, hc_object_t *object) {
request->action = action;
request->object_type = object_type;
request->object = object;
}
int hc_request_get_seq(const hc_request_t *request) { return request->seq; }
hc_request_t *hc_request_get_current(hc_request_t *request) {
return request->current ? request->current : request;
}
hc_request_t *hc_request_pop(hc_request_t *request) {
hc_request_t *current_request = hc_request_get_current(request);
hc_request_t *parent = current_request->parent;
request->current = parent;
if (parent) {
parent->data = current_request->data;
/* We only free the current_request if it was not the root */
hc_request_free(current_request);
}
return parent;
}
hc_request_state_t hc_request_get_state(const hc_request_t *request) {
return request->state;
}
void hc_request_set_state(hc_request_t *request, hc_request_state_t state) {
request->state = state;
}
int hc_request_get_state_count(const hc_request_t *request) {
return request->state_count;
}
void hc_request_set_state_count(hc_request_t *request, unsigned count) {
request->state_count = count;
}
hc_action_t hc_request_get_action(const hc_request_t *request) {
return request->action;
}
hc_object_type_t hc_request_get_object_type(const hc_request_t *request) {
return request->object_type;
}
hc_object_t *hc_request_get_object(const hc_request_t *request) {
return request->object;
}
hc_data_t *hc_request_get_data(const hc_request_t *request) {
return request->data;
}
void hc_request_set_data(hc_request_t *request, hc_data_t *data) {
assert(!request->data);
request->data = data;
}
void hc_request_reset_data(hc_request_t *request) {
if (!request->data) return;
hc_data_free(request->data);
request->data = NULL;
}
bool hc_request_is_subscription(const hc_request_t *request) {
hc_action_t action = hc_request_get_action(request);
hc_object_type_t object_type = hc_request_get_object_type(request);
return (action == ACTION_SUBSCRIBE) ||
(action == ACTION_CREATE && object_type == OBJECT_TYPE_SUBSCRIPTION);
}
bool hc_request_requires_object(const hc_request_t *request) {
hc_action_t action = hc_request_get_action(request);
return (action != ACTION_LIST) && (action != ACTION_SUBSCRIBE);
}
void hc_request_clear_data(hc_request_t *request) { request->data = NULL; }
void hc_request_set_complete(hc_request_t *request) {
request->state = REQUEST_STATE_COMPLETE;
}
bool hc_request_is_complete(const hc_request_t *request) {
return request->state == REQUEST_STATE_COMPLETE;
}
void hc_request_on_complete(hc_request_t *request) {
// request->state = REQUEST_STATE_COMPLETE;
if (!request->callback) return;
request->callback(request->data, request->callback_data);
}
void hc_request_on_notification(hc_request_t *request) {
if (!request->callback) return;
request->callback(request->data, request->callback_data);
}
hc_request_t *hc_request_make_subrequest(hc_request_t *request,
hc_action_t action,
hc_object_type_t object_type,
hc_object_t *object) {
hc_request_t *sr =
hc_request_create(request->seq, action, object_type, object,
request->callback, request->callback_data);
/* The parent is either the current one, or the request itself if NULL */
hc_request_t *current_request = hc_request_get_current(request);
hc_request_reset_data(current_request);
sr->parent = current_request;
request->current = sr;
return sr;
}
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