// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// gRPC API exposed by the wilco_dtc_supportd daemon. Normally the consumer of
// the API is the wilco_dtc daemon.

syntax = "proto3";

package diagnostics.grpc_api;

service WilcoDtcSupportd {
  // Sends a message to the diagnostics UI extension (hosted by the browser).
  // Delivery of the message is not guaranteed (for example, if the diagnostics
  // UI extension isn't running at the moment).
  rpc SendMessageToUi(SendMessageToUiRequest)
      returns (SendMessageToUiResponse) {}

  // Returns the specified data from the proc filesystem.
  rpc GetProcData(GetProcDataRequest) returns (GetProcDataResponse) {}

  // Returns the specified data from the sysfs filesystem.
  rpc GetSysfsData(GetSysfsDataRequest) returns (GetSysfsDataResponse) {}

  // Performs a web request to the specified HTTPS URL. Returns only whether the
  // request succeeded and the HTTP status code.
  //
  // It is implementation-defined which network, proxy and VPN settings are used
  // for making the request.
  rpc PerformWebRequest(PerformWebRequestParameter)
      returns (PerformWebRequestResponse) {}

  // Retrieves EC telemetry data.
  rpc GetEcTelemetry(GetEcTelemetryRequest) returns (GetEcTelemetryResponse) {}

  // Retrieves a list of diagnostic routines which wilco_dtc_supportd can run.
  rpc GetAvailableRoutines(GetAvailableRoutinesRequest)
      returns (GetAvailableRoutinesResponse) {}

  // Requests that wilco_dtc_supportd start a particular diagnostics routine.
  rpc RunRoutine(RunRoutineRequest) returns (RunRoutineResponse) {}

  // Requests an update on a particular diagnostics routine's status.
  rpc GetRoutineUpdate(GetRoutineUpdateRequest)
      returns (GetRoutineUpdateResponse) {}

  // Retrieves the configuration data.
  rpc GetConfigurationData(GetConfigurationDataRequest)
      returns (GetConfigurationDataResponse) {}

  // Retrieves the OS version.
  rpc GetOsVersion(GetOsVersionRequest) returns (GetOsVersionResponse) {}

  // Retrieves the VPD (Vital Product Data) field values.
  rpc GetVpdField(GetVpdFieldRequest) returns (GetVpdFieldResponse) {}

  // Retrieves the disk system data from smartctl/nvme command run output.
  rpc GetDriveSystemData(GetDriveSystemDataRequest)
      returns (GetDriveSystemDataResponse) {}

  // Request a notification with the current bluetooth adapter data.
  rpc RequestBluetoothDataNotification(RequestBluetoothDataNotificationRequest)
      returns (RequestBluetoothDataNotificationResponse) {}

  // Retrieves the available disk capacity of the stateful partition.
  rpc GetStatefulPartitionAvailableCapacity(
      GetStatefulPartitionAvailableCapacityRequest)
      returns (GetStatefulPartitionAvailableCapacityResponse) {}
}

// Parameters for the SendMessageToUi RPC.
message SendMessageToUiRequest {
  // Message contents. Must be a valid JSON string.
  string json_message = 1;
}

// Return value of the SendMessageToUi RPC.
message SendMessageToUiResponse {
  // Response message contents, as returned by the diagnostics UI extension.
  // Will be unset when the request was not delivered to any extension or the
  // extension(s) that received the message completed the request without any
  // reply.
  string response_json_message = 1;
}

// Holds a dump of a file contents.
message FileDump {
  // Absolute path to the file.
  string path = 1;

  // Canonicalized path to the file. Unlike |path|, this path never contains
  // symbolic links.
  string canonical_path = 2;

  // Contents of the file.
  bytes contents = 3;
}

// Parameters for the GetProcData RPC.
message GetProcDataRequest {
  // Type of information to be retrieved from the proc filesystem.
  //
  // NOTE: The following enums correspond to hardcoded file paths on the proc
  // filesystem provided by the OS kernel. There's NO guarantee that these files
  // will continue to be present after the OS kernel version changes.
  enum Type {
    TYPE_UNSET = 0;
    FILE_UPTIME = 1;   // request contents of "/proc/uptime"
    FILE_MEMINFO = 2;  // request contents of “/proc/meminfo"
    FILE_LOADAVG = 3;  // request contents of “/proc/loadavg"
    FILE_STAT = 4;     // request contents of “/proc/stat"
    DIRECTORY_ACPI_BUTTON =
        5;  // request contents of files under “/proc/acpi/button/"
    FILE_NET_NETSTAT = 6;  // request contents of “/proc/net/netstat"
    FILE_NET_DEV = 7;      // request contents of “/proc/net/dev"
    FILE_DISKSTATS = 8;    // request contents of “/proc/diskstats"
    FILE_CPUINFO = 9;      // request contents of “/proc/cpuinfo"
    FILE_VMSTAT = 10;      // request contents of “/proc/vmstat"
  };

  // Must not be |TYPE_UNSET|.
  Type type = 1;
}

// Return value of the GetProcData RPC.
message GetProcDataResponse {
  // Contents of the requested file(s) from the proc filesystem, as specified by
  // the |type| field of the request. The file paths are guaranteed to belong to
  // the /proc/ directory. Symlinks will NOT be followed.
  //
  // Example value: an entry with |path| and |canonical_path| equal to
  // "/proc/acpi/button/lid/LID0/state" and |contents| equal to "state: open".
  //
  // In case of failure to read some file(s), their entries will be omitted from
  // the |file_dump| field.
  //
  // NOTE: There's NO guarantee that the file names or formats of the file
  // contents will stay the same after the OS kernel version changes.
  repeated FileDump file_dump = 1;
}

// Parameters for the GetSysfsData RPC.
message GetSysfsDataRequest {
  // Type of information to be retrieved from the sysfs filesystem.
  enum Type {
    TYPE_UNSET = 0;
    CLASS_HWMON = 1;    // request information about hwmon devices (contents of
                        // files under /sys/class/hwmon/)
    CLASS_THERMAL = 2;  // request information about thermal zone devices and
                        // cooling devices (contents of files under
                        // /sys/class/thermal/)
    FIRMWARE_DMI_TABLES = 3;  // request SMBIOS information as raw DMI tables
                              // (contents of files under
                              // /sys/firmware/dmi/tables/)
    CLASS_POWER_SUPPLY = 4;   // request information about power supplies
                              // (contents of files under
                              // /sys/class/power_supply/)
    CLASS_BACKLIGHT = 5;      // request information about brightness
                              // (contents of files under /sys/class/backlight/)
    CLASS_NETWORK = 6;        // request information about WLAN and Ethernet
                              // (contents of files under /sys/class/net/)
    DEVICES_SYSTEM_CPU = 7;   // request information about CPU details.
                              // (contents of files under
                              // /sys/devices/system/cpu/)
  };

  // Must not be |TYPE_UNSET|.
  Type type = 1;
}

// Return value of the GetSysfsData RPC.
message GetSysfsDataResponse {
  // Contents of the requested file(s) from the sysfs filesystem, as specified
  // by the |type| field of the request. The file paths are guaranteed to belong
  // to the /sys/ directory. Whether symlinks in the reported directories are
  // followed depends on |type|-specific handling.
  //
  // Example value - two entries:
  // 1. The first entry having |path| equal to "/sys/class/hwmon/hwmon0/name",
  //    |canonical_path| to "/sys/devices/platform/coretemp.0/hwmon/hwmon0/name"
  //    and |contents| to "coretemp".
  // 2. The second one having |path| equal to
  //    "/sys/class/hwmon/hwmon0/power/control", |canonical_path| to
  //    "/sys/devices/platform/coretemp.0/hwmon/hwmon0/power/control" and
  //    |contents| to "auto".
  //
  // In case of failure to read some file(s), their entries will be omitted from
  // the |file_dump| field.
  //
  // NOTE: The set of files present here is determined by the information
  // returned by the host kernel through the sysfs interface.
  // NOTE: There's NO guarantee that the file names or formats of the file
  // contents will stay the same after the OS kernel version changes.
  repeated FileDump file_dump = 1;
}

// Parameters for the PerformWebRequest RPC.
//
// NOTE: The total size of all "string" and "bytes" fields in the request must
// not exceed 1 MB (1 000 000 bytes).
message PerformWebRequestParameter {
  // HTTP request method.
  enum HttpMethod {
    HTTP_METHOD_UNSET = 0;
    HTTP_METHOD_GET = 1;
    HTTP_METHOD_HEAD = 2;
    HTTP_METHOD_POST = 3;
    HTTP_METHOD_PUT = 4;
    HTTP_METHOD_PATCH = 5;
  }

  // Must be distinct from |HTTP_METHOD_UNSET|.
  HttpMethod http_method = 1;
  // Must have the "https" scheme.
  string url = 2;
  // List of HTTP headers.
  repeated string headers = 3;
  // Body of the HTTP request.
  bytes request_body = 4;
}

// Return value of the PerformWebRequest RPC.
message PerformWebRequestResponse {
  // Status of the finished request.
  enum Status {
    STATUS_UNSET = 0;
    // The request was successfully completed with a 2xx HTTP status.
    STATUS_OK = 1;
    // The request was rejected due to some required field being missing.
    STATUS_ERROR_REQUIRED_FIELD_MISSING = 2;
    // The request was rejected due to the |url| being invalid.
    STATUS_ERROR_INVALID_URL = 3;
    // The request was rejected due to the request being too large.
    STATUS_ERROR_MAX_SIZE_EXCEEDED = 4;
    // Failed to make the web request. This covers such cases when the network
    // is unavailable, or connection attempt failed, or TLS handshake failed,
    // or too many pending requests, etc.
    STATUS_NETWORK_ERROR = 5;
    // HTTP request finished with a non-2xx status.
    STATUS_HTTP_ERROR = 6;
    // Other errors that prevented a request with valid parameters from being
    // sent over the network.
    // E.g. the wilco_dtc_supportd daemon is unable to talk to the OS component
    // that hosts the network stack.
    STATUS_INTERNAL_ERROR = 7;
  }

  // Is guaranteed to be distinct from |STATUS_UNSET|.
  Status status = 1;
  // HTTP status code. This field is set when |status| is |STATUS_OK| or
  // |STATUS_HTTP_ERROR|.
  int32 http_status = 2;
  // Body of the HTTP response.
  // The length does not exceed 1MB (1 000 000 bytes). This field is set when
  // |status| is |STATUS_OK| or |STATUS_HTTP_ERROR|.
  bytes response_body = 3;
}

// Parameters for the GetEcTelemetry RPC.
message GetEcTelemetryRequest {
  // Opaque binary arguments for EC 0xF5 telemetry command.
  // The maximum allowed size is 32 bytes. Should to be non-empty.
  bytes payload = 1;
}

// Return value of the GetEcTelemetry RPC.
message GetEcTelemetryResponse {
  // Status of the EC telemetry request.
  enum Status {
    STATUS_UNSET = 0;
    // The EC telemetry command was successfully completed.
    STATUS_OK = 1;
    // The EC telemetry command was rejected due to the empty request payload.
    STATUS_ERROR_INPUT_PAYLOAD_EMPTY = 2;
    // The EC telemetry command was rejected due to the request payload being
    // too large.
    STATUS_ERROR_INPUT_PAYLOAD_MAX_SIZE_EXCEEDED = 3;
    // The EC telemetry command was failed due to EC driver error.
    STATUS_ERROR_ACCESSING_DRIVER = 4;
  }

  // Is guaranteed to be distinct from |STATUS_UNSET|.
  Status status = 1;

  // Data blob with encoded EC telemetry command response. This field is set
  // when |status| is |STATUS_OK|.
  // The maximum size is 32 bytes.
  bytes payload = 2;
}

// Whether or not wilco_dtc_supportd can communicate with
// CrosHealthdDiagnosticsService. Encoded in all messages whose implementations
// depend on a good connection to CrosHealthdDiagnosticsService.
enum RoutineServiceStatus {
  ROUTINE_SERVICE_STATUS_UNSET = 0;
  ROUTINE_SERVICE_STATUS_OK = 1;           // Good connection to cros_healthd.
  ROUTINE_SERVICE_STATUS_UNAVAILABLE = 2;  // No connection to cros_healthd.
}

// Enumeration of each of the diagnostics routines the platform may support.
enum DiagnosticRoutine {
  ROUTINE_UNSET = 0;
  ROUTINE_BATTERY = 1;
  ROUTINE_BATTERY_SYSFS = 2;
  ROUTINE_URANDOM = 3;
  ROUTINE_SMARTCTL_CHECK = 4;
  ROUTINE_CPU_CACHE = 5;
  ROUTINE_CPU_STRESS = 6;
  ROUTINE_FLOATING_POINT_ACCURACY = 7;
  ROUTINE_NVME_WEAR_LEVEL = 8;
  ROUTINE_NVME_SHORT_SELF_TEST = 9;
  ROUTINE_NVME_LONG_SELF_TEST = 10;
  ROUTINE_DISK_LINEAR_READ = 11;
  ROUTINE_DISK_RANDOM_READ = 12;
  ROUTINE_PRIME_SEARCH = 13;
}

// Enumeration of each of the possible statuses for a diagnostics routine.
enum DiagnosticRoutineStatus {
  ROUTINE_STATUS_READY = 0;    // Routine is ready to start.
  ROUTINE_STATUS_RUNNING = 1;  // Routine is currently running.
  ROUTINE_STATUS_WAITING = 2;  // Routine needs user input to continue.
  ROUTINE_STATUS_PASSED = 3;   // Routine completed and passed.
  ROUTINE_STATUS_FAILED = 4;   // Routine completed and failed.
  ROUTINE_STATUS_ERROR = 5;  // An error prevented the routine from completing.
  ROUTINE_STATUS_CANCELLED = 6;  // Routine was cancelled before completion.
                                 // A cancelled routine's information can still
                                 // be accessed with a GetRoutineUpdateRequest.
  ROUTINE_STATUS_FAILED_TO_START = 7;  // Routine could not be created.
  ROUTINE_STATUS_REMOVED =
      8;  // Routine has been removed and is no longer valid.
  ROUTINE_STATUS_CANCELLING = 9;  // Routine is being cancelled.
  ROUTINE_STATUS_INVALID_FIELD = 10;  // Invalid field in request.
}

// Enumeration of each of the messages a diagnostics routine can pass back.
// These messages prompt interaction from the user of the routine.
enum DiagnosticRoutineUserMessage {
  ROUTINE_USER_MESSAGE_UNSET = 0;  // No user interaction needed.
  ROUTINE_USER_MESSAGE_UNPLUG_AC_POWER = 1;  // User needs to unplug AC power.
}

// Parameters for the GetAvailableRoutines RPC. Although the message is
// currently empty, we may decide to add parameters in the future.
message GetAvailableRoutinesRequest {}

// Return value of the GetAvailableRoutines RPC.
message GetAvailableRoutinesResponse {
  repeated DiagnosticRoutine routines = 1;

  // Status of the connection to cros_healthd. Guaranteed to be distinct from
  // |ROUTINE_SERVICE_STATUS_UNSET|.
  RoutineServiceStatus service_status = 2;
}

// Parameters for the RunRoutine RPC.
message RunRoutineRequest {
  // Must be distinct from |ROUTINE_UNSET|.
  DiagnosticRoutine routine = 1;

  oneof parameters {
    BatteryRoutineParameters battery_params = 2;
    BatterySysfsRoutineParameters battery_sysfs_params = 3;
    UrandomRoutineParameters urandom_params = 4;
    SmartctlCheckRoutineParameters smartctl_check_params = 5;
    CpuRoutineParameters cpu_params = 6;
    FloatingPointAccuracyRoutineParameters floating_point_accuracy_params = 7;
    NvmeWearLevelRoutineParameters nvme_wear_level_params = 8;
    NvmeShortSelfTestRoutineParameters nvme_short_self_test_params = 9;
    NvmeLongSelfTestRoutineParameters nvme_long_self_test_params = 10;
    DiskLinearReadRoutineParameters disk_linear_read_params = 11;
    DiskRandomReadRoutineParameters disk_random_read_params = 12;
    PrimeSearchRoutineParameters prime_search_params = 13;
  }
}

// Parameters for the battery diagnostics routine.
message BatteryRoutineParameters {
  // Lower and upper bounds for the battery's design capacity, in mAh. The test
  // will pass if the design capactity of the battery read from the platform is
  // inclusively within these bounds. Neither parameter needs to be set - they
  // will default to low_mah = 1000 and high_mah = 10000 if unset.
  int32 low_mah = 1;
  int32 high_mah = 2;
}

// Parameters for the battery_sysfs diagnostics routine.
message BatterySysfsRoutineParameters {
  // Maximum cycle count allowed for the routine to pass.
  int32 maximum_cycle_count = 1;
  // Maximum percent battery wear allowed for the routine to pass.
  int32 percent_battery_wear_allowed = 2;
}

// Parameters for the urandom diagnostics routine.
message UrandomRoutineParameters {
  // Length of time, in seconds, to run the urandom routine for. If all reads
  // from /dev/urandom for this length of time are succesful, then the test
  // will pass. This parameter needs to be set and strictly greater than zero.
  int32 length_seconds = 1;
}

// Parameters for the smartctl_check diagnostics routine.
message SmartctlCheckRoutineParameters {}

// Parameters for the cpu cache/stress diagnostics routine.
message CpuRoutineParameters {
  // Length of time to run the CPU cache/stress diagnostics in seconds.
  // Note here, the length of running time should be at least five minutes for
  // the CPU stress diagnostics and the testing will fail if not.
  int32 length_seconds = 1;
}

// Parameters for the floating_point_accuracy diagnostics routine.
message FloatingPointAccuracyRoutineParameters {
  // Length of time, in seconds, to run the floating_point_accuracy routine for.
  uint32 length_seconds = 1;
}

// Parameters for wearlevel_check diagnostic routine.
message NvmeWearLevelRoutineParameters {
  // Threshold to determine if passed.
  uint32 wear_level_threshold = 1;
}

// Parameters for nvme_short_self-test diagnostic routine.
message NvmeShortSelfTestRoutineParameters {}

// Parameters for nvme_long_self-test diagnostic routine.
message NvmeLongSelfTestRoutineParameters {}

// Parameters for the disk_read's linear read diagnostics routine.
message DiskLinearReadRoutineParameters {
  // Length of time, in seconds, to run the linear read routine for.
  uint32 length_seconds = 1;
  // Size of the test file in MB.
  uint32 file_size_mb = 2;
}

// Parameters for the disk_read's random read diagnostics routine.
message DiskRandomReadRoutineParameters {
  // Length of time, in seconds, to run the random read routine for.
  uint32 length_seconds = 1;
  // Size of the test file in MB.
  uint32 file_size_mb = 2;
}

// Parameters for the prime_search diagnostics routine.
message PrimeSearchRoutineParameters {
  // Length of time, in seconds, to run the prime search routine for.
  uint32 length_seconds = 1;
  // Upper limit to search primes number for.
  uint64 max_num = 2;
}

// Return value of the RunRoutine RPC.
message RunRoutineResponse {
  // Can be used to request status or control the routine by sending a
  // GetRoutineUpdateRequest with the same uuid that was returned from
  // the RunRoutineResponse.
  int32 uuid = 1;

  DiagnosticRoutineStatus status = 2;

  // Status of the connection to cros_healthd. Guaranteed to be distinct from
  // |ROUTINE_SERVICE_STATUS_UNSET|.
  RoutineServiceStatus service_status = 3;
}

// Parameters for the GetRoutineUpdate RPC.
message GetRoutineUpdateRequest {
  // Must be the same uuid that was returned from a RunRoutineResponse.
  int32 uuid = 1;

  enum Command {
    COMMAND_UNSET = 0;
    RESUME = 1;
    CANCEL = 2;  // Cancelled routines must still be removed before the routine
                 // is destroyed.
    GET_STATUS = 3;
    REMOVE = 4;  // All routines which started successfully must be removed,
                 // otherwise they will persist on the system. This makes sure
                 // the routine is terminated before removing it.
  }

  // Must be distinct from |COMMAND_UNSET|.
  Command command = 2;
  // Whether or not the GetRoutineUpdateResponse should include all
  // output accumulated from the routine so far.
  bool include_output = 3;
}

// Return value for the GetRoutineUpdate RPC. All fields are populated
// regardless of |command| in the GetRoutineUpdateRequest, except output, which
// is only populated when |include_output| was true in the
// GetRoutineUpdateRequest.
message GetRoutineUpdateResponse {
  // Same uuid that was sent in the GetRoutineUpdateRequest.
  int32 uuid = 1;
  // Guaranteed to be distinct from |ROUTINE_STATUS_UNSET|.
  DiagnosticRoutineStatus status = 2;
  // Progress of the running routine, from 0-100.
  int32 progress_percent = 3;
  // Request for the user to take action in an interactive routine.
  DiagnosticRoutineUserMessage user_message = 4;
  // Accumulated output from the routine, e.g. logs. Output is not
  // flushed when returned.
  string output = 5;
  // More detailed status, e.g. "Cannot find battery path." This field should
  // be used to give the user more detail on a routine reporting
  // ROUTINE_STATUS_ERROR or ROUTINE_STATUS_FAILED.
  string status_message = 6;
  // Status of the connection to cros_healthd. Guaranteed to be distinct from
  // |ROUTINE_SERVICE_STATUS_UNSET|.
  RoutineServiceStatus service_status = 7;
}

// Parameters for the GetConfigurationData RPC. The message is currently empty.
message GetConfigurationDataRequest {}

// Return value for the GetConfigurationData RPC.
message GetConfigurationDataResponse {
  // Configuration data. The length does not exceed 20 000 bytes.
  // If there is no pre-loaded configuration data, the string is empty.
  string json_configuration_data = 1;
}

// Parameters for the GetOsVersion RPC.
message GetOsVersionRequest {}

// Return value for the GetOsVersion RPC.
message GetOsVersionResponse {
  // An OS version string in a format x.x.x, empty in case of any error.
  //
  // Example value:
  // - for a dev/test build: 11932.0.2019_03_20_1100
  // - for an official build: 11932.0.0
  string version = 1;
  // The milestone is the Chrome OS branch number, 0 in case of any error.
  int32 milestone = 2;
}

// Parameters for the GetVpdField RPC.
message GetVpdFieldRequest {
  enum VpdField {
    FIELD_UNSET = 0;
    // The |vpd_field_value| for the serial number field should be a non-empty
    // pure ASCII string (NOT UTF-8 or UTF-16).
    FIELD_SERIAL_NUMBER = 1;
    // The |vpd_field_value| for the model name field should be a non-empty pure
    // ASCII string (NOT UTF-8 or UTF-16).
    FIELD_MODEL_NAME = 2;
    // The |vpd_field_value| for the asset id field should be a non-empty pure
    // ASCII string (NOT UTF-8 or UTF-16).
    FIELD_ASSET_ID = 3;
    // The |vpd_field_value| for the SKU number field should be a non-empty pure
    // ASCII string (NOT UTF-8 or UTF-16).
    FIELD_SKU_NUMBER = 4;
    // The |vpd_field_value| for the UUID field should be a non-empty pure ASCII
    // string (NOT UTF-8 or UTF-16).
    FIELD_UUID_ID = 5;
    // The |vpd_field_value| for the manufacture date field should be a
    // non-empty pure ASCII string (NOT UTF-8 or UTF-16).
    FIELD_MANUFACTURE_DATE = 6;
    // The |vpd_field_value| for the activate date field should be a non-empty
    // pure ASCII string (NOT UTF-8 or UTF-16).
    FIELD_ACTIVATE_DATE = 7;
    // The |vpd_field_value| for the system ID field should be a non-empty pure
    // ASCII string (NOT UTF-8 or UTF-16).
    FIELD_SYSTEM_ID = 8;
  }

  // Must be distinct from |FIELD_UNSET|.
  VpdField vpd_field = 1;
}

// Return value for the GetVpdField RPC.
message GetVpdFieldResponse {
  // Status of the finished request.
  enum Status {
    STATUS_UNSET = 0;
    // The request was successfully completed and |vpd_field_value| is set.
    STATUS_OK = 1;
    // Failed to identify the requested VPD field.
    STATUS_ERROR_VPD_FIELD_UNKNOWN = 2;
    // Failed with an internal error to get the requested VPD field or the VPD
    // field is incorrectly formatted.
    STATUS_ERROR_INTERNAL = 4;
  }

  // Is guaranteed to be distinct from |STATUS_UNSET|.
  Status status = 1;

  // VPD field value. Empty if the VPD field is unset and the |status| is
  // distinct from |STATUS_OK|.
  string vpd_field_value = 2;
}

// Parameters for the GetDriveSystemData RPC.
message GetDriveSystemDataRequest {
  enum Type {
    TYPE_UNSET = 0;
    // Self-Monitoring, Analysis and Reporting Technology drive attributes.
    // Retrieved by running `smartctl -A`.
    SMART_ATTRIBUTES = 1;
    // Drive identity attributes.
    // Retrieved by running `nvme id-ctrl --vendor-specific`.
    IDENTITY_ATTRIBUTES = 2;
  }

  // Must not be |TYPE_UNSET|.
  Type type = 1;
}

// Return value for the GetDriveSystemData RPC.
message GetDriveSystemDataResponse {
  // Status of the finished request.
  enum Status {
    STATUS_UNSET = 0;
    // The request was successfully completed and |payload| is set.
    STATUS_OK = 1;
    // Failed to identify the requested drive system data type.
    STATUS_ERROR_REQUEST_TYPE_UNKNOWN = 2;
    // Failed to get the requested drive system data.
    STATUS_ERROR_REQUEST_PROCESSING = 3;
  }

  // Is guaranteed to be distinct from |STATUS_UNSET|.
  Status status = 1;

  // smartctl/nvme command run output.
  bytes payload = 2;
}

// Parameters for the RequestBluetoothDataNotification RPC. The message is
// currently empty.
message RequestBluetoothDataNotificationRequest {}

// Return value for the RequestBluetoothDataNotification RPC. The message is
// currently empty.
message RequestBluetoothDataNotificationResponse {}

// Parameters for the GetStatefulPartitionAvailableCapacity RPC. The message is
// currently empty.
message GetStatefulPartitionAvailableCapacityRequest {}

// Return value for the GetStatefulPartitionAvailableCapacity RPC.
message GetStatefulPartitionAvailableCapacityResponse {
  // Status of the finished request.
  enum Status {
    STATUS_UNSET = 0;
    // The request was successfully completed and |available_capacity_mb| is
    // set.
    STATUS_OK = 1;
    // Failed to get the requested capacity data.
    STATUS_ERROR_REQUEST_PROCESSING = 2;
  }

  // Is guaranteed to be distinct from |STATUS_UNSET|.
  Status status = 1;

  // Stateful partition available capacity, rounded down to
  // multiples of 100MiB (100 * 1024 * 1024 bytes).
  int32 available_capacity_mb = 2;
}