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Time Sync Plugin

Version: 1.0

Status: ⚫⚫⚫

TimeSync plugin for Thunder framework.

Table of Contents

Introduction

Scope

This document describes purpose and functionality of the TimeSync plugin. It includes detailed specification about its configuration, methods and properties as well as sent notifications.

Case Sensitivity

All identifiers of the interfaces described in this document are case-sensitive. Thus, unless stated otherwise, all keywords, entities, properties, relations and actions should be treated as such.

Acronyms, Abbreviations and Terms

The table below provides and overview of acronyms used in this document and their definitions.

Acronym Description
API Application Programming Interface
HTTP Hypertext Transfer Protocol
JSON JavaScript Object Notation; a data interchange format
JSON-RPC A remote procedure call protocol encoded in JSON

The table below provides and overview of terms and abbreviations used in this document and their definitions.

Term Description
callsign The name given to an instance of a plugin. One plugin can be instantiated multiple times, but each instance the instance name, callsign, must be unique.

References

Ref ID Description
HTTP HTTP specification
JSON-RPC JSON-RPC 2.0 specification
JSON JSON specification
Thunder Thunder API Reference

Description

The Time Sync plugin provides time synchronization functionality from various time sources (e.g. NTP).

The plugin is designed to be loaded and executed within the Thunder framework. For more information about the framework refer to [Thunder].

Configuration

The table below lists configuration options of the plugin.

Name Type Description
callsign string Plugin instance name (default: TimeSync)
classname string Class name: TimeSync
locator string Library name: libThunderTimeSync.so
startmode string Determines if the plugin shall be started automatically along with the framework
deferred boolean (deprecated) (optional) Determines if automatic time sync shall be initially disabled. This parameter is deprecated and SubSystemControl could be used instead
periodicity number (optional) Periodicity of time synchronization (in hours), 0 for one-off synchronization
retries number (optional) Number of synchronization attempts if the source cannot be reached (may be 0)
interval number (optional) Time to wait (in milliseconds) before retrying a synchronization attempt after a failure
sources array Time sources
sources[#] string (a time source entry)

Interfaces

This plugin implements the following interfaces:

Methods

The following methods are provided by the TimeSync plugin:

TimeSync interface methods:

Method Description
synchronize Synchronizes time

synchronize method

Synchronizes time.

Description

Use this method to synchronize the system time with the currently configured time source. If automatic time synchronization is initially disabled or stopped, it will be restarted.

Parameters

This method takes no parameters.

Result

Name Type Description
result null Always null

Errors

Code Message Description
12 ERROR_INPROGRESS Returned when the method is called while previously triggered synchronization is in progress.
23 ERROR_INCOMPLETE_CONFIG Returned when the source configuration is missing or invalid.

Example

Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "TimeSync.1.synchronize"
}

Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": null
}

Properties

The following properties are provided by the TimeSync plugin:

TimeSync interface properties:

Property Description
synctime RO Most recent synchronized time
time Current system time

synctime property

Provides access to the most recent synchronized time.

This property is read-only.

Value

Result

Name Type Description
result object Most recent synchronized time
result.time string Synchronized time (in ISO8601 format); empty string if the time has never been synchronized
result?.source string (optional) The synchronization source e.g. an NTP server

Example

Get Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "TimeSync.1.synctime"
}

Get Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": {
    "time": "2019-05-07T07:20:26Z",
    "source": "ntp://example.com"
  }
}

time property

Provides access to the current system time.

Description

Upon setting this property automatic time synchronization will be stopped. Usage of this property is deprecated and the SubSystem control plugin can be used as an alternative to achieve the same

Value

Name Type Description
(property) string System time (in ISO8601 format)

Result

Name Type Description
result string System time (in ISO8601 format)

Errors

Code Message Description
30 ERROR_BAD_REQUEST The time is invalid

Example

Get Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "TimeSync.1.time"
}

Get Response

{
  "jsonrpc": "2.0",
  "id": 42,
  "result": "2019-05-07T07:20:26Z"
}

Set Request

{
  "jsonrpc": "2.0",
  "id": 42,
  "method": "TimeSync.1.time",
  "params": "2019-05-07T07:20:26Z"
}

Set Response

{
    "jsonrpc": "2.0",
    "id": 42,
    "result": "null"
}

Notifications

Notifications are autonomous events triggered by the internals of the implementation and broadcasted via JSON-RPC to all registered observers. Refer to [Thunder] for information on how to register for a notification.

The following events are provided by the TimeSync plugin:

TimeSync interface events:

Event Description
timechange Signals a time change

timechange event

Signals a time change.

Parameters

This event carries no parameters.

Example

{
  "jsonrpc": "2.0",
  "method": "client.events.1.timechange"
}