130 lines
2.8 KiB
Ruby
130 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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module Grafana
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# Allows for easy formatting and manipulations of timestamps
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# coming from a Grafana url
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class TimeWindow
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include ::Gitlab::Utils::StrongMemoize
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def initialize(from, to)
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@from = from
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@to = to
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end
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def formatted
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{
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start: window[:from].formatted,
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end: window[:to].formatted
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}
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end
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def in_milliseconds
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window.transform_values(&:to_ms)
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end
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private
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def window
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strong_memoize(:window) do
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specified_window
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rescue Timestamp::Error
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default_window
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end
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end
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def specified_window
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RangeWithDefaults.new(
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from: Timestamp.from_ms_since_epoch(@from),
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to: Timestamp.from_ms_since_epoch(@to)
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).to_hash
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end
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def default_window
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RangeWithDefaults.new.to_hash
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end
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end
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# For incomplete time ranges, adds default parameters to
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# achieve a complete range. If both full range is provided,
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# range will be returned.
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class RangeWithDefaults
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DEFAULT_RANGE = 8.hours
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# @param from [Grafana::Timestamp, nil] Start of the expected range
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# @param to [Grafana::Timestamp, nil] End of the expected range
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def initialize(from: nil, to: nil)
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@from = from
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@to = to
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apply_defaults!
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end
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def to_hash
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{ from: @from, to: @to }.compact
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end
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private
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def apply_defaults!
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@to ||= @from ? relative_end : Timestamp.new(Time.now)
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@from ||= relative_start
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end
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def relative_start
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Timestamp.new(DEFAULT_RANGE.before(@to.time))
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end
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def relative_end
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Timestamp.new(DEFAULT_RANGE.since(@from.time))
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end
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end
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# Offers a consistent API for timestamps originating from
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# Grafana or other sources, allowing for formatting of timestamps
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# as consumed by Grafana-related utilities
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class Timestamp
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Error = Class.new(StandardError)
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attr_accessor :time
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# @param timestamp [Time]
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def initialize(time)
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@time = time
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end
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# Formats a timestamp from Grafana for compatibility with
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# parsing in JS via `new Date(timestamp)`
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def formatted
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time.utc.strftime('%FT%TZ')
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end
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# Converts to milliseconds since epoch
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def to_ms
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time.to_i * 1000
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end
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class << self
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# @param time [String] Representing milliseconds since epoch.
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# This is what JS "decided" unix is.
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def from_ms_since_epoch(time)
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return if time.nil?
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raise Error.new('Expected milliseconds since epoch') unless ms_since_epoch?(time)
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new(cast_ms_to_time(time))
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end
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private
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def cast_ms_to_time(time)
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Time.at(time.to_i / 1000.0)
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end
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def ms_since_epoch?(time)
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ms = time.to_i
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ms.to_s == time && ms.bit_length < 64
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end
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end
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end
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end
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