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fluxer_gateway/src/utils/backoff_utils.erl

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+%% Copyright (C) 2026 Fluxer Contributors
+%%
+%% This file is part of Fluxer.
+%%
+%% Fluxer is free software: you can redistribute it and/or modify
+%% it under the terms of the GNU Affero General Public License as published by
+%% the Free Software Foundation, either version 3 of the License, or
+%% (at your option) any later version.
+%%
+%% Fluxer is distributed in the hope that it will be useful,
+%% but WITHOUT ANY WARRANTY; without even the implied warranty of
+%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+%% GNU Affero General Public License for more details.
+%%
+%% You should have received a copy of the GNU Affero General Public License
+%% along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+
+-module(backoff_utils).
+
+-export([
+    calculate/1,
+    calculate/2
+]).
+
+-spec calculate(non_neg_integer()) -> non_neg_integer().
+calculate(Attempt) ->
+    calculate(Attempt, 30000).
+
+-spec calculate(non_neg_integer(), pos_integer()) -> non_neg_integer().
+calculate(Attempt, MaxMs) ->
+    BackoffMs = round(1000 * math:pow(2, Attempt)),
+    min(BackoffMs, MaxMs).