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92 lines
2.7 KiB
92 lines
2.7 KiB
11 years ago
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// Copyright (c) 2014 The Bitcoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "timedata.h"
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#include "netbase.h"
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#include "sync.h"
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#include "ui_interface.h"
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#include "util.h"
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#include <boost/foreach.hpp>
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using namespace std;
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static CCriticalSection cs_nTimeOffset;
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static int64_t nTimeOffset = 0;
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//
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// "Never go to sea with two chronometers; take one or three."
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// Our three time sources are:
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// - System clock
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// - Median of other nodes clocks
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// - The user (asking the user to fix the system clock if the first two disagree)
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//
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//
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int64_t GetTimeOffset()
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{
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LOCK(cs_nTimeOffset);
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return nTimeOffset;
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}
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int64_t GetAdjustedTime()
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{
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return GetTime() + GetTimeOffset();
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}
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void AddTimeData(const CNetAddr& ip, int64_t nTime)
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{
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int64_t nOffsetSample = nTime - GetTime();
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LOCK(cs_nTimeOffset);
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// Ignore duplicates
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static set<CNetAddr> setKnown;
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if (!setKnown.insert(ip).second)
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return;
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// Add data
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static CMedianFilter<int64_t> vTimeOffsets(200,0);
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vTimeOffsets.input(nOffsetSample);
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LogPrintf("Added time data, samples %d, offset %+d (%+d minutes)\n", vTimeOffsets.size(), nOffsetSample, nOffsetSample/60);
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if (vTimeOffsets.size() >= 5 && vTimeOffsets.size() % 2 == 1)
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{
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int64_t nMedian = vTimeOffsets.median();
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std::vector<int64_t> vSorted = vTimeOffsets.sorted();
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// Only let other nodes change our time by so much
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if (abs64(nMedian) < 70 * 60)
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{
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nTimeOffset = nMedian;
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}
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else
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{
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nTimeOffset = 0;
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static bool fDone;
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if (!fDone)
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{
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// If nobody has a time different than ours but within 5 minutes of ours, give a warning
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bool fMatch = false;
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BOOST_FOREACH(int64_t nOffset, vSorted)
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if (nOffset != 0 && abs64(nOffset) < 5 * 60)
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fMatch = true;
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if (!fMatch)
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{
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fDone = true;
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string strMessage = _("Warning: Please check that your computer's date and time are correct! If your clock is wrong Bitcoin will not work properly.");
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strMiscWarning = strMessage;
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LogPrintf("*** %s\n", strMessage);
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uiInterface.ThreadSafeMessageBox(strMessage, "", CClientUIInterface::MSG_WARNING);
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}
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}
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}
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if (fDebug) {
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BOOST_FOREACH(int64_t n, vSorted)
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LogPrintf("%+d ", n);
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LogPrintf("| ");
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}
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LogPrintf("nTimeOffset = %+d (%+d minutes)\n", nTimeOffset, nTimeOffset/60);
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}
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}
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