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Updated vendored ntp package (#681)

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The github.com/beevik/ntp package was recently updated with some
API changes that broke node_exporter. This commit fetches the
latest version of the ntp package and brings node_exporter in
line with the latest API.
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Brett Vickers 2017-10-03 23:33:49 -07:00 • committed by Ben Kochie
commit b62c7bc0ad
6 changed files with 390 additions and 257 deletions
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Release v0.1.1
==============
**Breaking changes**
* Removed the `MaxStratum` constant.
**Deprecations**
* Officially deprecated the `TimeV` function.
**Internal changes**
* Removed `minDispersion` from the `RootDistance` calculation, since the value
was arbitrary.
* Moved some validation into main code path so that invalid `TransmitTime` and
`mode` responses trigger an error even when `Response.Validate` is not
called.
Release v0.1.0
==============
This is the initial release of the `ntp` package. Currently it supports the following features:
* `Time()` to query the current time according to a remote NTP server.
* `Query()` to query multiple pieces of time-related information from a remote NTP server.
* `QueryWithOptions()`, which is like `Query()` but with the ability to override default query options.
Time-related information returned by the `Query` functions includes:
* `Time`: the time the server transmitted its response, according to the server's clock.
* `ClockOffset`: the estimated offset of the client's clock relative to the server's clock. You may apply this offset to any local system clock reading once the query is complete.
* `RTT`: an estimate of the round-trip-time delay between the client and the server.
* `Precision`: the precision of the server's clock reading.
* `Stratum`: the "stratum" level of the server, where 1 indicates a server directly connected to a reference clock, and values greater than 1 indicating the number of hops from the reference clock.
* `ReferenceID`: A unique identifier for the NTP server that was contacted.
* `ReferenceTime`: The time at which the server last updated its local clock setting.
* `RootDelay`: The server's round-trip delay to the reference clock.
* `RootDispersion`: The server's total dispersion to the referenced clock.
* `RootDistance`: An estimate of the root synchronization distance.
* `Leap`: The leap second indicator.
* `MinError`: A lower bound on the clock error between the client and the server.
* `Poll`: the maximum polling interval between successive messages on the server.
The `Response` structure returned by the `Query` functions also contains a `Response.Validate()` function that returns an error if any of the fields returned by the server are invalid.