mirror of
https://github.com/lightningnetwork/lnd.git
synced 2024-11-19 18:10:34 +01:00
90 lines
3.6 KiB
Go
90 lines
3.6 KiB
Go
package lncfg
|
|
|
|
import (
|
|
"os"
|
|
"os/user"
|
|
"path/filepath"
|
|
"strings"
|
|
)
|
|
|
|
const (
|
|
// DefaultConfigFilename is the default configuration file name lnd
|
|
// tries to load.
|
|
DefaultConfigFilename = "lnd.conf"
|
|
|
|
// DefaultMaxPendingChannels is the default maximum number of incoming
|
|
// pending channels permitted per peer.
|
|
DefaultMaxPendingChannels = 1
|
|
|
|
// DefaultIncomingBroadcastDelta defines the number of blocks before the
|
|
// expiry of an incoming htlc at which we force close the channel. We
|
|
// only go to chain if we also have the preimage to actually pull in the
|
|
// htlc. BOLT #2 suggests 7 blocks. We use a few more for extra safety.
|
|
// Within this window we need to get our sweep or 2nd level success tx
|
|
// confirmed, because after that the remote party is also able to claim
|
|
// the htlc using the timeout path.
|
|
DefaultIncomingBroadcastDelta = 10
|
|
|
|
// DefaultFinalCltvRejectDelta defines the number of blocks before the
|
|
// expiry of an incoming exit hop htlc at which we cancel it back
|
|
// immediately. It is an extra safety measure over the final cltv
|
|
// requirement as it is defined in the invoice. It ensures that we
|
|
// cancel back htlcs that, when held on to, may cause us to force close
|
|
// the channel because we enter the incoming broadcast window. Bolt #11
|
|
// suggests 9 blocks here. We use a few more for additional safety.
|
|
//
|
|
// There is still a small gap that remains between receiving the
|
|
// RevokeAndAck and canceling back. If a new block arrives within that
|
|
// window, we may still force close the channel. There is currently no
|
|
// way to reject an UpdateAddHtlc of which we already know that it will
|
|
// push us in the broadcast window.
|
|
DefaultFinalCltvRejectDelta = DefaultIncomingBroadcastDelta + 3
|
|
|
|
// DefaultOutgoingBroadcastDelta defines the number of blocks before the
|
|
// expiry of an outgoing htlc at which we force close the channel. We
|
|
// are not in a hurry to force close, because there is nothing to claim
|
|
// for us. We do need to time the htlc out, because there may be an
|
|
// incoming htlc that will time out too (albeit later). Bolt #2 suggests
|
|
// a value of -1 here, but we allow one block less to prevent potential
|
|
// confusion around the negative value. It means we force close the
|
|
// channel at exactly the htlc expiry height.
|
|
DefaultOutgoingBroadcastDelta = 0
|
|
|
|
// DefaultOutgoingCltvRejectDelta defines the number of blocks before
|
|
// the expiry of an outgoing htlc at which we don't want to offer it to
|
|
// the next peer anymore. If that happens, we cancel back the incoming
|
|
// htlc. This is to prevent the situation where we have an outstanding
|
|
// htlc that brings or will soon bring us inside the outgoing broadcast
|
|
// window and trigger us to force close the channel. Bolt #2 suggests a
|
|
// value of 0. We pad it a bit, to prevent a slow round trip to the next
|
|
// peer and a block arriving during that round trip to trigger force
|
|
// closure.
|
|
DefaultOutgoingCltvRejectDelta = DefaultOutgoingBroadcastDelta + 3
|
|
)
|
|
|
|
// CleanAndExpandPath expands environment variables and leading ~ in the
|
|
// passed path, cleans the result, and returns it.
|
|
// This function is taken from https://github.com/btcsuite/btcd
|
|
func CleanAndExpandPath(path string) string {
|
|
if path == "" {
|
|
return ""
|
|
}
|
|
|
|
// Expand initial ~ to OS specific home directory.
|
|
if strings.HasPrefix(path, "~") {
|
|
var homeDir string
|
|
u, err := user.Current()
|
|
if err == nil {
|
|
homeDir = u.HomeDir
|
|
} else {
|
|
homeDir = os.Getenv("HOME")
|
|
}
|
|
|
|
path = strings.Replace(path, "~", homeDir, 1)
|
|
}
|
|
|
|
// NOTE: The os.ExpandEnv doesn't work with Windows-style %VARIABLE%,
|
|
// but the variables can still be expanded via POSIX-style $VARIABLE.
|
|
return filepath.Clean(os.ExpandEnv(path))
|
|
}
|