105 lines
3.7 KiB
Go
105 lines
3.7 KiB
Go
// Copyright 2017-2021 DERO Project. All rights reserved.
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// Use of this source code in any form is governed by RESEARCH license.
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// license can be found in the LICENSE file.
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// GPG: 0F39 E425 8C65 3947 702A 8234 08B2 0360 A03A 9DE8
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//
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package p2p
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//import "fmt"
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import "time"
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import "math/rand"
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import "github.com/beevik/ntp"
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import "github.com/deroproject/derohe/globals"
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// these servers automatically rotate every hour as per documentation
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// we also rotate them randomly
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// TODO support ipv6
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var timeservers = []string{ // facebook/google do leap smearing, so they should not be mixed here
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"0.pool.ntp.org",
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"1.pool.ntp.org",
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"2.pool.ntp.org",
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"3.pool.ntp.org",
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"ntp1.hetzner.de",
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"ntp2.hetzner.de",
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"ntp3.hetzner.de",
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"time.cloudflare.com", // anycast
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"ntp.se", // anycast
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}
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// continusosly checks time for deviation if possible
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// ToDo initial warning should NOT get hidden in messages
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// TODO we need to spport interleaved NTP protocol, possibly over TCP
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func time_check_routine() {
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const offset_count = 128
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var offsets [offset_count]time.Duration
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var offset_index int
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random := rand.New(globals.NewCryptoRandSource())
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timeinsync := false
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for {
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server := timeservers[random.Int()%len(timeservers)]
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if response, err := ntp.Query(server); err != nil {
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//logger.V(2).Error(err, "error while querying time", "server", server)
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} else if response.Validate() == nil {
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if response.ClockOffset.Seconds() > -.05 && response.ClockOffset.Seconds() < .05 {
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}
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offsets[offset_index] = response.ClockOffset
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offset_index = (offset_index + 1) % offset_count
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var avg_offset time.Duration
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var avg_count time.Duration
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for _, o := range offsets {
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if o != 0 {
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avg_offset += o
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avg_count++
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}
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}
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avg_offset = avg_offset / avg_count
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// if offset is small, do not trust ourselves but instead trust the system itself
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// we do not expect our resolution to be better than 50 ms
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if avg_offset.Milliseconds() < -50 || avg_offset.Milliseconds() > 50 {
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globals.ClockOffsetNTP = avg_offset
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} else {
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globals.ClockOffsetNTP = 0
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}
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globals.TimeIsInSyncNTP = true
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// if offset is more than 1 sec
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if response.ClockOffset.Seconds() > -1.0 && response.ClockOffset.Seconds() < 1.0 { // chrony can maintain upto 5 ms, ntps can maintain upto 10
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timeinsync = true
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} else {
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timeinsync = false
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logger.V(1).Error(nil, "Your system time deviation is more than 1 secs (%s)."+
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"\nYou may experience chain sync issues and/or other side-effects."+
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"\nIf you are mining, your blocks may get rejected."+
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"\nPlease sync your system using chrony/NTP software (default availble in all OS)."+
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"\n eg. ntpdate pool.ntp.org (for linux/unix)", "offset", response.ClockOffset)
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}
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}
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if !timeinsync {
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time.Sleep(5 * time.Second)
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} else {
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time.Sleep(time.Duration((random.Intn(60) + 60)) * time.Second) // check every 60 + random(60) secs to avoid fingerprinting
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}
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}
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}
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