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zeekay
7cf87b230b
The module already called itself github.com/luxfi/node while containing no node in Go: cmd/luxd was twenty-one lines that printed the size of a few types, and the Go column of the matrix measured a VM plugin. A repo that fetches the thing it claims to be has not replaced it, so the Go sources move in — 1515 files, the daemon and everything under it — and the build reaches outside this module for nothing. Rust and C++ sit beside it unchanged and are still measured against it by the differential. That is the point of one repo: the reference implementation and the two ports are the same checkout, so parity is a thing you can run rather than a thing you assert. Verified: builds, and the closure carries no lux-private — checked at build time rather than believed. The daemon starts twelve chains on a local network (P X C Q Z A B G K M F, plus D through its plugin) and reports healthy.
114 lines
2.9 KiB
Go
114 lines
2.9 KiB
Go
// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package dynamicip
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import (
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"context"
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"net/netip"
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"time"
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luxatomic "github.com/luxfi/atomic"
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luxlog "github.com/luxfi/log"
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)
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const ipResolutionTimeout = 10 * time.Second
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var _ Updater = (*updater)(nil)
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// Updater periodically updates this node's public IP.
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// Dispatch() and Stop() should only be called once.
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type Updater interface {
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// Start periodically resolving and updating our public IP.
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// Doesn't return until after Stop() is called.
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// Should be called in a goroutine.
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Dispatch(log luxlog.Logger)
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// Stop resolving and updating our public IP.
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Stop()
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}
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type updater struct {
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// The IP we periodically modify.
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dynamicIP *luxatomic.Atomic[netip.AddrPort]
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// Used to find out what our public IP is.
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resolver Resolver
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// The parent of all contexts passed into resolver.Resolve().
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// Cancelling causes Dispatch() to eventually return.
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rootCtx context.Context
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// Cancelling causes Dispatch() to eventually return.
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// All in-flight calls to resolver.Resolve() will be cancelled.
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rootCtxCancel context.CancelFunc
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// Closed when Dispatch() has returned.
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doneChan chan struct{}
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// How often we update the public IP.
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updateFreq time.Duration
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}
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// Returns a new Updater that updates [dynamicIP]
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// every [updateFreq]. Uses [resolver] to find
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// out what our public IP is.
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func NewUpdater(
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dynamicIP *luxatomic.Atomic[netip.AddrPort],
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resolver Resolver,
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updateFreq time.Duration,
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) Updater {
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ctx, cancel := context.WithCancel(context.Background())
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return &updater{
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dynamicIP: dynamicIP,
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resolver: resolver,
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rootCtx: ctx,
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rootCtxCancel: cancel,
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doneChan: make(chan struct{}),
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updateFreq: updateFreq,
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}
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}
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// Start updating [u.dynamicIP] every [u.updateFreq].
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// Stops when [dynamicIP.stopChan] is closed.
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func (u *updater) Dispatch(log luxlog.Logger) {
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ticker := time.NewTicker(u.updateFreq)
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defer func() {
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ticker.Stop()
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close(u.doneChan)
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}()
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var (
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initialAddrPort = u.dynamicIP.Get()
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oldAddr = initialAddrPort.Addr()
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port = initialAddrPort.Port()
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)
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for {
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select {
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case <-ticker.C:
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ctx, cancel := context.WithTimeout(u.rootCtx, ipResolutionTimeout)
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newAddr, err := u.resolver.Resolve(ctx)
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cancel()
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if err != nil {
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log.Warn("couldn't resolve public IP. If this machine's IP recently changed, it may be sharing the wrong public IP with peers",
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luxlog.Err(err),
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)
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continue
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}
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if newAddr != oldAddr {
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u.dynamicIP.Set(netip.AddrPortFrom(newAddr, port))
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log.Info("updated public IP",
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luxlog.String("oldIP", oldAddr.String()),
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luxlog.String("newIP", newAddr.String()),
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)
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oldAddr = newAddr
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}
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case <-u.rootCtx.Done():
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return
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}
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}
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}
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func (u *updater) Stop() {
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// Cause Dispatch() to return and cancel all
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// in-flight calls to resolver.Resolve().
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u.rootCtxCancel()
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// Wait until Dispatch() has returned.
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<-u.doneChan
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}
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