ruleset.h

/*
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements. See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership. The ASF licenses this file
 to you 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.
*/
//////////////////////////////////////////////////////////////////////////////////////////////
//
// Implement the classes for the various types of hash keys we support.
//
#pragma once

#include<string>

#include<tscore/ink_assert.h>

#include"matcher.h"
#include"factory.h"
#include"resources.h"
#include"parser.h"
#include"conditions.h"

///////////////////////////////////////////////////////////////////////////////
// Class holding one ruleset. A ruleset is one (or more) pre-conditions, and
// one (or more) operators.
//
classRuleSet
{
public:
// Holding the IF and ELSE operators and mods, in two separate linked lists.
structOperatorPair {
OperatorPair() = default;

OperatorPair(const OperatorPair &) = delete;
 OperatorPair &operator=(const OperatorPair &) = delete;

 Operator *oper = nullptr;
 OperModifiers oper_mods = OPER_NONE;
 };

RuleSet() { Dbg(dbg_ctl, "RuleSet CTOR"); }

~RuleSet()
 {
Dbg(dbg_ctl, "RulesSet DTOR");
delete _operators[0].oper; // These are pointers
delete _operators[1].oper;
delete next;
 }

// noncopyable
RuleSet(const RuleSet &) = delete;
voidoperator=(const RuleSet &) = delete;

// No reason to inline these
voidappend(RuleSet *rule);
 Condition *make_condition(Parser &p, constchar *filename, int lineno);
booladd_operator(Parser &p, constchar *filename, int lineno);
 ResourceIDs get_all_resource_ids() const;

bool
has_operator() const
 {
return (nullptr != _operators[0].oper) || (nullptr != _operators[1].oper);
 }

void
set_hook(TSHttpHookID hook)
 {
 _hook = hook;
 }

 ConditionGroup *
get_group()
 {
return &_group;
 }

 TSHttpHookID
get_hook() const
 {
return _hook;
 }

 ResourceIDs
get_resource_ids() const
 {
return _ids;
 }

bool
last() const
 {
return _last;
 }

void
switch_branch()
 {
 _is_else = !_is_else;
 }

 OperModifiers
exec(const OperatorPair &ops, const Resources &res) const
 {
if (nullptr == ops.oper) {
return ops.oper_mods;
 }

auto no_reenable_count{ops.oper->do_exec(res)};

ink_assert(no_reenable_count < 2);
if (no_reenable_count) {
returnstatic_cast<OperModifiers>(ops.oper_mods | OPER_NO_REENABLE);
 }

return ops.oper_mods;
 }

const OperatorPair &
eval(const Resources &res)
 {
if (_group.eval(res)) {
return _operators[0]; // IF conditions
 } else {
return _operators[1]; // ELSE conditions
 }
 }

 RuleSet *next = nullptr; // Linked list

private:
 ConditionGroup _group; // All conditions are now wrapped in a group
 OperatorPair _operators[2]; // Holds both the IF and the ELSE set of operators

// State values (updated when conds / operators are added)
 TSHttpHookID _hook = TS_HTTP_READ_RESPONSE_HDR_HOOK; // Which hook is this rule for
 ResourceIDs _ids = RSRC_NONE;
bool _last = false;
bool _is_else = false; // Are we in the else clause of the new rule? For parsing.
};