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util/throttle.lua @ 11026:a086825ed73a
util.dataforms: Convert media element sizes to avoid error on Lua 5.3
The stanza API does not accept number values and threw an error due to
the height and width attributes of the media element (XEP-0221).
This part had no test coverage previously, explaining why it was not
discovered until now.
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 16 Aug 2020 12:55:55 +0200 |
parent | 8555:4f0f5b49bb03 |
child | 12975:d10957394a3c |
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local gettime = require "util.time".now local setmetatable = setmetatable; local _ENV = nil; -- luacheck: std none local throttle = {}; local throttle_mt = { __index = throttle }; function throttle:update() local newt = gettime(); local elapsed = newt - self.t; self.t = newt; local balance = (self.rate * elapsed) + self.balance; if balance > self.max then self.balance = self.max; else self.balance = balance; end return self.balance; end function throttle:peek(cost) cost = cost or 1; return self.balance >= cost or self:update() >= cost; end function throttle:poll(cost, split) if self:peek(cost) then self.balance = self.balance - cost; return true; else local balance = self.balance; if split then self.balance = 0; end return false, balance, (cost-balance); end end local function create(max, period) return setmetatable({ rate = max / period, max = max, t = gettime(), balance = max }, throttle_mt); end return { create = create; };