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// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <yang/adaptor.h>
#include <iostream>
using namespace std;
using namespace isc::data;
namespace isc {
namespace yang {
ConstElementPtr
Adaptor::getContext(ConstElementPtr parent) {
ConstElementPtr context = parent->get("user-context");
ConstElementPtr comment = parent->get("comment");
if (!comment) {
return (context);
}
ElementPtr result;
if (context) {
result = copy(context);
} else {
result = Element::createMap();
}
result->set("comment", comment);
return (result);
}
void
Adaptor::fromParent(const string& name, ConstElementPtr parent,
ConstElementPtr list) {
ConstElementPtr param = parent->get(name);
if (!param) {
return;
}
for (ElementPtr const& item : list->listValue()) {
// don't override. Skip this entry if it already has the parameter.
if (item->contains(name)) {
continue;
}
item->set(name, param);
}
}
void
Adaptor::toParent(const string& name, ElementPtr parent,
ConstElementPtr list) {
ConstElementPtr param;
bool first = true;
for (ElementPtr const& item : list->listValue()) {
if (first) {
first = false;
param = item->get(name);
} else if ((!param && item->contains(name)) ||
(param && !item->contains(name)) ||
(param && item->contains(name) &&
!param->equals(*item->get(name)))) {
isc_throw(BadValue,
"inconsistent value of " << name
<< " in " << list->str());
}
}
if (!first && param) {
for (ElementPtr const& item : list->listValue()) {
if (param) {
item->remove(name);
}
}
parent->set(name, param);
}
}
namespace {
/// @brief Apply insert.
///
/// This function applies an insert action at the given scope:
/// - in a map it adds the value at the key when the key does not exist
/// - in a list it appends the value
/// - in other scope type it does nothing
/// @note a copy of the value is used to avoid unwanted sharing/side effects.
///
/// @param key The key of the modification.
/// @param value The value of the modification.
/// @param scope The place to apply the insert.
void applyInsert(ConstElementPtr key, ConstElementPtr value,
ElementPtr scope) {
if (scope->getType() == Element::map) {
if (!key || !value || (key->getType() != Element::string)) {
return;
}
string name = key->stringValue();
if (!name.empty() && !scope->contains(name)) {
scope->set(name, copy(value));
}
} else if (scope->getType() == Element::list) {
if (value) {
scope->add(copy(value));
}
}
}
/// @brief Apply replace.
///
/// This function works only on map scopes and acts as insert at the
/// exception the new value is set even if the key already exists.
///
/// @param key The key of the modification.
/// @param value The value of the modification.
/// @param scope The place to apply the replace.
void applyReplace(ConstElementPtr key, ConstElementPtr value,
ElementPtr scope) {
if ((scope->getType() != Element::map) ||
!key || !value || (key->getType() != Element::string)) {
return;
}
string name = key->stringValue();
if (!name.empty()) {
scope->set(name, copy(value));
}
}
/// @brief Apply delete.
///
/// This function deletes the value designed by the key from the given scope:
/// - in a map the key is the key of the value to remove
/// - in a list the key is:
/// * when it is an integer the index of the value to remove
/// * when it is a map the key / value pair which belongs to the value
/// to remove
/// - in other scope type it does nothing
///
/// @param key The key item of the path.
/// @param scope The place to apply the delete.
void applyDelete(ConstElementPtr key, ElementPtr scope) {
if (scope->getType() == Element::map) {
if (!key || (key->getType() != Element::string)) {
return;
}
string name = key->stringValue();
if (!name.empty()) {
scope->remove(name);
}
} else if (scope->getType() == Element::list) {
if (!key) {
return;
} else if (key->getType() == Element::integer) {
int index = key->intValue();
if ((index >= 0) && (index < scope->size())) {
scope->remove(index);
}
} else if (key->getType() == Element::map) {
ConstElementPtr entry = key->get("key");
ConstElementPtr value = key->get("value");
if (!entry || !value || (entry->getType() != Element::string)) {
return;
}
string name = entry->stringValue();
if (name.empty()) {
return;
}
for (int i = 0; i < scope->size(); ++i) {
ElementPtr item = scope->getNonConst(i);
if (!item || (item->getType() != Element::map)) {
continue;
}
ConstElementPtr compare = item->get(name);
if (compare && value->equals(*compare)) {
scope->remove(i);
return;
}
}
}
}
}
/// @brief Apply action.
///
/// This function applies one action (insert, replace or delete) using
/// applyInsert, applyReplace or applyDelete.
///
/// @param actions The action list.
/// @param scope The current scope.
/// @param next The index of the next action.
void applyAction(ConstElementPtr actions, ElementPtr scope, size_t next) {
if (next == actions->size()) {
return;
}
ConstElementPtr action = actions->get(next);
++next;
if (!action || (action->getType() != Element::map) ||
!action->contains("action")) {
applyAction(actions, scope, next);
return;
}
string name = action->get("action")->stringValue();
if (name == "insert") {
applyInsert(action->get("key"), action->get("value"), scope);
} else if (name == "replace") {
applyReplace(action->get("key"), action->get("value"), scope);
} else if (name == "delete") {
applyDelete(action->get("key"), scope);
}
applyAction(actions, scope, next);
}
/// @brief Apply recursively actions following the path and going down
/// in the to-be-modified structure.
///
/// The recursive call when the end of the path is not reached is done:
/// - in a map on the value at the key
/// - in a list the next path item is:
/// * if it is a positive integer on the value at the index
/// * if it is -1 on all elements of the list
/// * if a map on the element where the key / value pair belongs to
///
/// @param path The search list.
/// @param actions The action list.
/// @param scope The current scope.
/// @param next The index of the next item to use in the path.
void applyDown(ConstElementPtr path, ConstElementPtr actions, ElementPtr scope,
size_t next) {
if (!scope) {
return;
}
if (next == path->size()) {
applyAction(actions, scope, 0);
return;
}
ConstElementPtr step = path->get(next);
++next;
if (scope->getType() == Element::map) {
if (!step || (step->getType() != Element::string)) {
return;
}
string name = step->stringValue();
if (name.empty() || !scope->contains(name)) {
return;
}
ConstElementPtr down(scope->get(name));
if (down) {
ElementPtr mutable_down(copy(down, 0));
applyDown(path, actions, mutable_down, next);
scope->set(name, mutable_down);
}
} else if (scope->getType() == Element::list) {
if (!step) {
return;
}
auto downs = scope->listValue();
if (step->getType() == Element::map) {
ConstElementPtr key = step->get("key");
ConstElementPtr value = step->get("value");
if (!key || !value || (key->getType() != Element::string)) {
return;
}
string name = key->stringValue();
if (name.empty()) {
return;
}
for (ElementPtr& down : downs) {
if (!down || (down->getType() != Element::map)) {
continue;
}
ConstElementPtr compare = down->get(name);
if (compare && value->equals(*compare)) {
applyDown(path, actions, down, next);
return;
}
}
} else if (step->getType() != Element::integer) {
return;
}
int index = step->intValue();
if (index == -1) {
for (ElementPtr& down : downs) {
applyDown(path, actions, down, next);
}
} else if ((index >= 0) && (index < scope->size())) {
applyDown(path, actions, scope->getNonConst(index), next);
}
}
}
} //anonymous namespace
/// Apply recursively starting at the beginning of the path.
void
Adaptor::modify(ConstElementPtr path, ConstElementPtr actions,
ElementPtr config) {
applyDown(path, actions, config, 0);
}
} // namespace yang
} // namespace isc
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