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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/fuchsia_component_support/annotations_manager.h"
#include <lib/fpromise/promise.h>
#include <set>
#include <string>
#include <string_view>
#include <tuple>
#include <utility>
#include "base/check.h"
#include "base/fuchsia/fuchsia_logging.h"
#include "base/fuchsia/mem_buffer_util.h"
#include "base/logging.h"
#include "base/memory/raw_ref.h"
#include "base/strings/string_number_conversions.h"
namespace fuchsia_component_support {
namespace {
using AnnotationKeySet =
std::set<fuchsia::element::AnnotationKey, AnnotationKeyCompare>;
} // namespace
fuchsia::element::Annotation MakeAnnotation(std::string_view key,
std::string_view value) {
fuchsia::element::Annotation result;
result.key.namespace_ = "global";
result.key.value = std::string(key);
constexpr size_t kArbitraryTextBufferThreshold = 128;
if (value.size() <= kArbitraryTextBufferThreshold) {
result.value.set_text(std::string(value));
} else {
result.value.set_buffer(base::MemBufferFromString(value, /*name=*/key));
}
return result;
}
fuchsia::element::Annotation MakeBoolAnnotation(std::string_view key,
bool value) {
static constexpr std::string_view kTrue("true");
static constexpr std::string_view kFalse("false");
return MakeAnnotation(key, value ? kTrue : kFalse);
}
fuchsia::element::Annotation MakeIntAnnotation(std::string_view key,
int value) {
return MakeAnnotation(key, base::NumberToString(value));
}
bool AnnotationKeyCompare::operator()(
const fuchsia::element::AnnotationKey& key1,
const fuchsia::element::AnnotationKey& key2) const {
return std::tie(key1.namespace_, key1.value) <
std::tie(key2.namespace_, key2.value);
}
class AnnotationsManager::ControllerImpl
: public fuchsia::element::AnnotationController {
public:
explicit ControllerImpl(AnnotationsManager& manager) : manager_(manager) {}
~ControllerImpl() override = default;
// fuchsia::element::AnnotationController implementation.
void UpdateAnnotations(
std::vector<fuchsia::element::Annotation> annotations_to_set,
std::vector<fuchsia::element::AnnotationKey> annotations_to_delete,
UpdateAnnotationsCallback callback) override {
DVLOG(2) << __func__;
if (manager_->UpdateAnnotations(std::move(annotations_to_set),
std::move(annotations_to_delete))) {
callback(fpromise::ok());
} else {
callback(fpromise::error(
fuchsia::element::UpdateAnnotationsError::INVALID_ARGS));
}
}
void GetAnnotations(GetAnnotationsCallback callback) override {
DVLOG(2) << __func__;
callback(fpromise::ok(manager_->GetAnnotations()));
}
void WatchAnnotations(WatchAnnotationsCallback callback) override {
DVLOG(2) << __func__;
if (have_changes_) {
have_changes_ = false;
callback(fpromise::ok(manager_->GetAnnotations()));
return;
}
if (on_annotations_changed_) {
manager_->bindings_.CloseBinding(this, ZX_ERR_BAD_STATE);
return;
}
on_annotations_changed_ = std::move(callback);
}
void OnAnnotationsChanged() {
have_changes_ = true;
if (on_annotations_changed_) {
WatchAnnotations(std::exchange(on_annotations_changed_, {}));
}
}
private:
const raw_ref<AnnotationsManager> manager_;
// Initially true so that the first call to WatchAnnotations() will
// return results immediately.
bool have_changes_ = true;
WatchAnnotationsCallback on_annotations_changed_;
};
AnnotationsManager::AnnotationsManager() = default;
AnnotationsManager::~AnnotationsManager() = default;
bool AnnotationsManager::UpdateAnnotations(
std::vector<fuchsia::element::Annotation> to_set,
std::vector<fuchsia::element::AnnotationKey> to_delete) {
AnnotationKeySet changed;
for (const auto& key : to_delete) {
annotations_.erase(key);
auto [it, inserted] = changed.insert(key);
if (!inserted) {
return false;
}
}
for (auto& annotation : to_set) {
annotations_.insert_or_assign(
fuchsia::element::AnnotationKey(annotation.key),
std::move(annotation.value));
auto [it, inserted] = changed.insert(annotation.key);
if (!inserted) {
return false;
}
}
if (!changed.empty()) {
for (auto& binding : bindings_.bindings()) {
binding->impl()->OnAnnotationsChanged();
}
}
return true;
}
std::vector<fuchsia::element::Annotation> AnnotationsManager::GetAnnotations()
const {
std::vector<fuchsia::element::Annotation> result;
result.reserve(annotations_.size());
for (const auto& [key, value] : annotations_) {
result.push_back(fuchsia::element::Annotation{.key = key});
zx_status_t status = value.Clone(&result.back().value);
ZX_CHECK(status == ZX_OK, status);
}
return result;
}
void AnnotationsManager::Connect(
fidl::InterfaceRequest<fuchsia::element::AnnotationController> request) {
bindings_.AddBinding(std::make_unique<ControllerImpl>(*this),
std::move(request));
}
} // namespace fuchsia_component_support
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