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#include "config_patcher.h"
#include <library/cpp/yconf/patcher/unstrict_config.h>
#include <library/cpp/json/json_reader.h>
#include <library/cpp/json/json_prettifier.h>
#include <util/generic/maybe.h>
#include <util/generic/ptr.h>
#include <util/generic/xrange.h>
#include <util/stream/file.h>
#include <util/string/subst.h>
#include <array>
namespace {
class TWrapper {
public:
TWrapper(const TString& base, const NJson::TJsonValue& patch, const TString& prefix);
void Patch();
TString GetPatchedConfig() {
Patch();
return PatchedConfixText;
}
private:
void Preprocess();
void Postprocess();
private:
static const TString IncludeDirective;
static const TString IncludeGuard;
private:
TString BaseConfigText;
THolder<TUnstrictConfig> Config;
NJson::TJsonValue JsonPatch;
TString Prefix;
TString PatchedConfixText;
bool Patched;
bool NeedsPostprocessing;
};
const TString TWrapper::IncludeDirective = "#include";
const TString TWrapper::IncludeGuard = "__INCLUDE__ :";
TWrapper::TWrapper(const TString& base, const NJson::TJsonValue& patch, const TString& prefix)
: BaseConfigText(base)
, JsonPatch(patch)
, Prefix(prefix)
, Patched(false)
, NeedsPostprocessing(false)
{
}
void TWrapper::Patch() {
if (Patched)
return;
Preprocess();
const NJson::TJsonValue::TMapType* values;
if (!JsonPatch.GetMapPointer(&values))
ythrow yexception() << "unable to get map pointer in the json patch.";
for (const auto& value : *values) {
Config->PatchEntry(value.first, value.second.GetStringRobust(), Prefix);
}
Postprocess();
Patched = true;
}
void TWrapper::Preprocess() {
TString parsed;
size_t pos = BaseConfigText.find(IncludeDirective);
if (pos != TString::npos) {
NeedsPostprocessing = true;
parsed = BaseConfigText.replace(pos, IncludeDirective.size(), IncludeGuard);
} else {
parsed = BaseConfigText;
}
Config.Reset(new TUnstrictConfig);
if (!Config->ParseMemory(parsed.data())) {
TString errors;
Config->PrintErrors(errors);
ythrow yexception() << "Can't parse config:" << errors;
}
}
void TWrapper::Postprocess() {
PatchedConfixText = Config->ToString();
if (NeedsPostprocessing) {
SubstGlobal(PatchedConfixText, IncludeGuard, IncludeDirective);
}
}
void MakeDiff(
NJson::TJsonValue& container,
const TYandexConfig::Section* source,
const TYandexConfig::Section* target,
const TString& parentPrefix = TString()) {
Y_ABORT_UNLESS(target);
const TString& prefix = parentPrefix ? (parentPrefix + ".") : parentPrefix;
for (const auto& [name, value]: target->GetDirectives()) {
const auto p = source ? source->GetDirectives().FindPtr(name) : nullptr;
if (!p || TString(*p) != value) {
container[prefix + name] = value;
}
}
if (source) {
for (const auto& [name, value] : source->GetDirectives()) {
if (!target->GetDirectives().contains(name)) {
container[prefix + name] = "__remove__";
}
}
}
TMap<TCiString, std::array<TVector<const TYandexConfig::Section *>, 2>> alignedSections;
auto fillSections = [&](const TYandexConfig::TSectionsMap& sections, size_t targetIndex) {
for (const auto& [sectionName, section] : sections) {
alignedSections[sectionName][targetIndex].push_back(section);
}
};
if (source) {
fillSections(source->GetAllChildren(), 0);
}
fillSections(target->GetAllChildren(), 1);
for (const auto& [sectionName, pair]: alignedSections) {
// Cannot use structured binding on std::array here because of a bug in MSVC.
const auto& sourceSections = pair[0];
const auto& targetSections = pair[1];
const bool needsIndex = targetSections.size() > 1;
if (targetSections.empty()) {
Y_ABORT_UNLESS(source);
container[prefix + sectionName] = "__remove_all__";
} else {
for (const size_t i: xrange(targetSections.size())) {
MakeDiff(
container,
i < sourceSections.size() ? sourceSections[i] : nullptr,
targetSections[i],
!needsIndex ? prefix + sectionName : prefix + sectionName + '[' + ToString(i) + ']');
}
if (sourceSections.size() > targetSections.size()) {
container[
prefix +
sectionName +
'[' +
ToString(targetSections.size()) +
':' +
ToString(sourceSections.size() - 1) +
']'] = "__remove__";
}
}
}
if (target->GetAllChildren().empty() && target->GetDirectives().empty()) {
container[prefix] = "__add_section__";
}
}
}
namespace NConfigPatcher {
TString Patch(const TString& config, const TString& patch, const TOptions& options) {
if (!patch) {
return config;
}
NJson::TJsonValue parsedPatch;
TStringInput ss(patch);
if (!NJson::ReadJsonTree(&ss, true, &parsedPatch, true)) {
ythrow yexception() << "Cannot parse patch as json";
}
return Patch(config, parsedPatch, options);
}
TString Patch(const TString& config, const NJson::TJsonValue& parsedPatch, const TOptions& options) {
TWrapper patcher(config, parsedPatch, options.Prefix);
return patcher.GetPatchedConfig();
}
TString Diff(const TString& sourceText, const TString& targetText) {
TUnstrictConfig source;
if (!source.ParseMemory(sourceText.data())) {
throw yexception() << "Cannot parse source config";
}
TUnstrictConfig target;
if (!target.ParseMemory(targetText.data())) {
throw yexception() << "Cannot parse target config";
}
NJson::TJsonValue diff(NJson::JSON_MAP);
MakeDiff(diff, source.GetRootSection(), target.GetRootSection());
return NJson::PrettifyJson(diff.GetStringRobust());
}
}
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