| // Copyright 2022 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/developer/forensics/feedback/annotations/device_id_provider.h" |
| |
| #include <lib/syslog/cpp/macros.h> |
| |
| #include <optional> |
| |
| #include "src/developer/forensics/feedback/annotations/constants.h" |
| #include "src/lib/files/directory.h" |
| #include "src/lib/files/file.h" |
| #include "src/lib/fxl/strings/string_printf.h" |
| #include "src/lib/uuid/uuid.h" |
| |
| namespace forensics::feedback { |
| namespace { |
| |
| // Reads a device id from the file at |path|. If the device id doesn't exist or is invalid, return |
| // a nullopt. |
| std::optional<std::string> ReadDeviceId(const std::string& path) { |
| std::string id; |
| if (!files::ReadFileToString(path, &id)) { |
| return std::nullopt; |
| } |
| |
| return id; |
| } |
| |
| // Creates a new device id and stores it at |path|. |
| // |
| // The id is a 128-bit (pseudo) random UUID in the form of version 4 as described in RFC 4122, |
| // section 4.4. |
| std::string InitializeDeviceId(const std::string& path) { |
| if (const auto read_id = ReadDeviceId(path); |
| read_id.has_value() && uuid::IsValid(read_id.value())) { |
| return read_id.value(); |
| } |
| |
| std::string new_id = uuid::Generate(); |
| if (!files::WriteFile(path, new_id.c_str(), new_id.size())) { |
| FX_LOGS(ERROR) << fxl::StringPrintf("Cannot write device id '%s' to '%s'", new_id.c_str(), |
| path.c_str()); |
| } |
| |
| FX_LOGS(INFO) << "Created new feedback device id"; |
| return new_id; |
| } |
| |
| } // namespace |
| |
| LocalDeviceIdProvider::LocalDeviceIdProvider(const std::string& path) |
| : device_id_(InitializeDeviceId(path)) {} |
| |
| std::set<std::string> LocalDeviceIdProvider::GetKeys() const { return {kDeviceFeedbackIdKey}; } |
| |
| void LocalDeviceIdProvider::GetOnUpdate(::fit::function<void(Annotations)> callback) { |
| callback(DeviceIdToAnnotations()(device_id_)); |
| } |
| |
| Annotations DeviceIdToAnnotations::operator()(const ErrorOr<std::string>& device_id) { |
| return {{kDeviceFeedbackIdKey, device_id}}; |
| } |
| |
| std::set<std::string> RemoteDeviceIdProvider::GetKeys() const { return {kDeviceFeedbackIdKey}; } |
| |
| } // namespace forensics::feedback |