mirror of
https://github.com/fluencelabs/examples
synced 2025-04-25 02:32:16 +00:00
103 lines
3.8 KiB
TypeScript
103 lines
3.8 KiB
TypeScript
/*
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* Copyright 2021 Fluence Labs Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { createClient, setLogLevel, FluenceClient } from "@fluencelabs/fluence";
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import { krasnodar, Node } from "@fluencelabs/fluence-network-environment";
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// import { ethers } from "ethers";
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import { ts_getter } from "./timestamp_getter";
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// simple timestamp diff calculator and counter
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function timestamp_delta(proposal_ts_ms: number, network_ts_ms: number[]): Map<string, Array<number>> {
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// acceptable deviation for proposed timestamp from network timestamps
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const acceptable_ts_diff: number = 60 * 1_000; // 1 Minute
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// valid and invalid array counters
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let valid_ts: Array<number> = [];
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let invalid_ts: Array<number> = [];
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// if proposed timestamp <= network timestamp + acceptable delta
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// we have a valid proposed timestamp
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for (var t of network_ts_ms) {
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let upper_threshold: number = t + acceptable_ts_diff;
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let lower_threshold: number = t - acceptable_ts_diff;
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// console.log(t, threshold_ts);
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if (lower_threshold <= proposal_ts_ms && proposal_ts_ms <= upper_threshold) {
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valid_ts.push(t);
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}
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else {
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invalid_ts.push(t);
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}
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}
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// return results as a map for further, e..g, consensus, processing
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let results = new Map<string, Array<number>>();
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results.set("valid", valid_ts);
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results.set("invalid", invalid_ts);
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return results;
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}
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async function main() {
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// setLogLevel('DEBUG');
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const fluence = await createClient(krasnodar[2]);
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// console.log("created a fluence client %s with relay %s", fluence.selfPeerId, fluence.relayPeerId);
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// Proxy for timestamp extracted from EIP712 proposal
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var now = new Date;
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var utc_ts = Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate(),
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now.getUTCHours(), now.getUTCMinutes(), now.getUTCSeconds(), now.getUTCMilliseconds());
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console.log("proxy for EIP712 proposed timestamp (utc): ", utc_ts);
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// fetch timestamps from Krsnodar network with ts_getter
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// see timestamp_getter.ts which was created by compiling ./aqua-scripts/timestamp_getter.aqua
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const network_result = await ts_getter(fluence, krasnodar[2].peerId, Number(20));
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// calculate the deltas between network timestamps + delta and proposed timestamp
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const ts_diffs = timestamp_delta(utc_ts, network_result);
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// exceedingly simple consensus calculator
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// if 2/3 of ts deltas are valid, we have consensus for a valid proposed timestamp
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if (ts_diffs.has("valid") && ts_diffs.has("invalid")) {
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let valid_ts = ts_diffs.get("valid")?.length;
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let invalid_ts = ts_diffs.get("invalid")?.length;
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if (valid_ts !== undefined && invalid_ts !== undefined && (valid_ts / (valid_ts + invalid_ts)) >= (2 / 3)) {
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console.log("We have network consensus and accept the proposed timestamp ", utc_ts);
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console.log("Now, the client can sign the EIP712 document.");
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}
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else {
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console.log("We do not have network consensus and reject the proposed timestamp ", utc_ts);
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}
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}
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else {
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console.log("Error: Something went wrong with getting our timestamp validated.");
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}
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return;
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}
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main()
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.then(() => process.exit(0))
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.catch(error => {
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console.error(error);
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process.exit(1);
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});
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