| // Copyright 2019 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. |
| |
| #ifndef SRC_DEVELOPER_FORENSICS_UTILS_UTC_TIME_PROVIDER_H_ |
| #define SRC_DEVELOPER_FORENSICS_UTILS_UTC_TIME_PROVIDER_H_ |
| |
| #include <fuchsia/time/cpp/fidl.h> |
| #include <lib/sys/cpp/service_directory.h> |
| |
| #include <memory> |
| #include <optional> |
| #include <string> |
| |
| #include "src/developer/forensics/utils/previous_boot_file.h" |
| #include "src/lib/timekeeper/clock.h" |
| #include "src/lib/timekeeper/system_clock.h" |
| |
| namespace forensics { |
| |
| // Provides the UTC time only if the device's system clock is accurate. |
| // |
| // Can be configured to record the UTC-monotonic difference from the previous boot by providing a |
| // non-nullopt |utc_monotonic_difference_path|. |
| class UtcTimeProvider { |
| public: |
| // fuchsia.time.Utc is expected to be in |services|. |
| UtcTimeProvider(std::shared_ptr<sys::ServiceDirectory> services, timekeeper::Clock* clock); |
| UtcTimeProvider(std::shared_ptr<sys::ServiceDirectory> services, timekeeper::Clock* clock, |
| PreviousBootFile utc_monotonic_difference_file); |
| |
| // Returns the current UTC time if the device's UTC time is accurate, std::nullopt otherwise. |
| std::optional<zx::time_utc> CurrentTime() const; |
| |
| // Returns the difference between the UTC clock and the device's monotonic time if the device's |
| // UTC time is accurate, std::nullopt otherwise. |
| // |
| // This value can be added to a monotonic time to convert it to a UTC time. |
| std::optional<zx::duration> CurrentUtcMonotonicDifference() const; |
| std::optional<zx::duration> PreviousBootUtcMonotonicDifference() const; |
| |
| private: |
| UtcTimeProvider(std::shared_ptr<sys::ServiceDirectory> services, timekeeper::Clock* clock, |
| std::optional<PreviousBootFile> utc_monotonic_difference_file); |
| |
| // Keeps making asynchronous calls until the UTC time is accurate. |
| void WatchForAccurateUtcTime(); |
| |
| std::shared_ptr<sys::ServiceDirectory> services_; |
| timekeeper::Clock* clock_; |
| |
| fuchsia::time::UtcPtr utc_; |
| |
| std::optional<PreviousBootFile> utc_monotonic_difference_file_; |
| |
| // The last difference between the UTC and monotonic clocks in the previous boot. |
| std::optional<zx::duration> previous_boot_utc_monotonic_difference_; |
| |
| bool is_utc_time_accurate_ = false; |
| }; |
| |
| } // namespace forensics |
| |
| #endif // SRC_DEVELOPER_FORENSICS_UTILS_UTC_TIME_PROVIDER_H_ |