local M = {}
local seen = {}
local count = 0
local MAX = 50
local function make_key(version, peer, ua)
    return #version .. ":" .. version .. #peer .. ":" .. peer .. #ua .. ":" .. ua
end
function M.report(version, peer, ua)
    if not version or version == "" then return end
    if not peer or peer == "" then return end
    if not ua or ua == "" then return end
    local key = make_key(version, peer, ua)
    if seen[key] then return end
    if count >= MAX then return end
    seen[key] = true
    count = count + 1
    M.sink(version, peer, ua)
end
return M