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eed5b906a8
In order to support external rules loaders that may extend the falco rules format with new top level objects, move away from providing individual filter objects to the filter_ruleset via calls to add(). Instead, pass the entire compile output returned by the compiler to the ruleset using a new method add_compile_output(). Custom users can then cast back the compile output to the appropriate derived class for use in the ruleset. Move the declaration of the compile output to a standalone class so it can be used by rulesets without including the entire rules loader header files, and add a new factory method new_compile_output() to the compiler so it can create a derived class if necessary. This change is backwards-compatible with existing rulesets, as the default implementation of add_compile_output() simply iterates over rules and calls add() for each rule. This change also speeds up rule loading. Previously, each rule condition was compiled twice: 1. First, in the compiler, to see if it was valid. 2. Second, in the falco engine before providing each rule to the ruleset. Add the compiled filter to the falco_rule object instead of throwing it away in the compiler. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>
76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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/*
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Copyright (C) 2023 The Falco Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#pragma once
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#include "rule_loader.h"
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#include "rule_loader_compile_output.h"
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#include "rule_loader_collector.h"
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#include "indexed_vector.h"
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#include "falco_rule.h"
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namespace rule_loader
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{
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/*!
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\brief Compiler for the ruleset loader of the falco engine
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*/
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class compiler
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{
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public:
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compiler() = default;
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virtual ~compiler() = default;
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compiler(compiler&&) = default;
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compiler& operator = (compiler&&) = default;
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compiler(const compiler&) = default;
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compiler& operator = (const compiler&) = default;
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// Return a new result object, suitable for passing to
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// compile().
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virtual std::unique_ptr<compile_output> new_compile_output();
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/*!
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\brief Compiles a list of falco rules
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*/
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virtual void compile(
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configuration& cfg,
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const collector& col,
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compile_output& out) const;
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private:
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void compile_list_infos(
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configuration& cfg,
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const collector& col,
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indexed_vector<falco_list>& out) const;
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void compile_macros_infos(
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configuration& cfg,
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const collector& col,
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indexed_vector<falco_list>& lists,
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indexed_vector<falco_macro>& out) const;
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void compile_rule_infos(
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configuration& cfg,
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const collector& col,
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indexed_vector<falco_list>& lists,
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indexed_vector<falco_macro>& macros,
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indexed_vector<falco_rule>& out) const;
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};
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}; // namespace rule_loader
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