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Joost Jager 2020-09-21 08:44:40 +02:00
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circuitbreaker

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MIT License
Copyright (c) 2020 Joost Jager
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Circuit Breaker
`circuitbreaker` is to Lightning what firewalls are to the internet.
It allows nodes to protect themselves from being flooded with htlcs. With
`circuitbreaker` a maximum to the number of in-flight htlcS can be set on a
per-peer basis. Known and trusted peers for example can be assigned a higher
maximum, while a new channel from a previously unseen node may be limited to
only a few pending htlcs.
Why are limits needed?
In today's Lighting Network payments are routed via a series of hops. Each of
those hops will incur a cost for forwarding that payment. While the htlc of an
hop is in-flight, the associated amount is locked in the hop's outgoing channel.
Those funds cannot be used for another purpose. This can be considered to be an
opportunity cost.
Furthermore each channel has a limited number of htlc 'slots'. The current
maximum is 483 slots. This means that regardless of channel capacity, there can
never be more than 483 htlcs pending. With large channels in particular, it can
happen that all slots are occupied while only a fraction of the channel capacity
is used. In that case the whole channel is considered to be locked. The duration
of the lock can vary from a few seconds to as long as 2 weeks or even more.
When the payment is completed successfully, each hop will collect a routing fee.
But depending on the length of the lock and the htlc amounts, this may be far
from sufficient to cover the costs.
This is where `circuitbreaker` comes in. It puts up a defense around that
valuable channel liquidity and helps to keep the locked coins at work to
maximize routing revenue.
## How to use
### Requirements
* `lnd` version 0.11.0-beta or above.
### Configuration
`circuitbreaker` by default reads its configuration from `~/.circuitbreaker/circuitbreaker.yaml`.
Below is an example of a configuration that limits the number of pending htlcs
to five by default. For two peers, the limit is lowered to two. A last peer is
allowed to have up to a hundred htlcs in-flight.
```
maxPendingHtlcs: 5
groups:
- maxPendingHtlcs: 2
peers:
- 033220600ae3949f40739955948ca43fc60174c9c51fb51e6debfc27091e58cebe
- 021561e3cf45345052912c88b0df7deb7c2ec4a1cf08333edb1ed8dbb3fd203d77
- maxPendingHtlcs: 100
peers:
- 02674dabd68df75f78b6b6dc35dd49dd70db5293ca7a68f9cafa76adafabd5dc7c
```
### Run
* Clone this repository
* `go install`
* Execute `circuitbreaker` with the correct command line flags to connect to
`lnd`. See `circuitbreaker --help` for details.
## Limitations
* This software is alpha quality. Use at your own risk and be careful in particular on mainnet.
* The interfaces on `lnd` aren't optimized for this purpose. Therefore the use
of a combination of different endpoints is required. This may lead to certain
corner cases.
* `circuitbreaker` is currently unaware of htlcs that are already in flight when
it is started.

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package main
import (
"fmt"
"io/ioutil"
"os"
"github.com/lightningnetwork/lnd/routing/route"
"go.uber.org/zap"
"gopkg.in/yaml.v2"
)
type yamlGroup struct {
MaxPendingHtlcs int `yaml:"maxPendingHtlcs"`
Peers []string `yaml:"peers"`
}
type yamlConfig struct {
MaxPendingHtlcs int `yaml:"maxPendingHtlcs"`
Groups []yamlGroup `yaml:"groups"`
}
type config struct {
MaxPendingHtlcs int
MaxPendingHtlcsPerPeer map[route.Vertex]int
}
var defaultConfig = config{
MaxPendingHtlcs: 1,
}
type configLoader struct {
path string
}
func newConfigLoader(path string) *configLoader {
loader := &configLoader{
path: path,
}
return loader
}
func (c *configLoader) load() (*config, error) {
if _, err := os.Stat(c.path); os.IsNotExist(err) {
log.Debug("No config file, using defaults",
zap.String("file", c.path))
return &defaultConfig, nil
}
yamlFile, err := ioutil.ReadFile(c.path)
if err != nil {
return nil, err
}
var yamlCfg yamlConfig
err = yaml.UnmarshalStrict(yamlFile, &yamlCfg)
if err != nil {
return nil, err
}
config := config{
MaxPendingHtlcs: yamlCfg.MaxPendingHtlcs,
MaxPendingHtlcsPerPeer: make(map[route.Vertex]int),
}
for _, group := range yamlCfg.Groups {
for _, peer := range group.Peers {
peerPubkey, err := route.NewVertexFromStr(peer)
if err != nil {
return nil, err
}
_, exists := config.MaxPendingHtlcsPerPeer[peerPubkey]
if exists {
return nil, fmt.Errorf("peer %v in multiple groups",
peerPubkey)
}
config.MaxPendingHtlcsPerPeer[peerPubkey] =
group.MaxPendingHtlcs
}
}
log.Info("Read config file", zap.String("file", c.path))
return &config, nil
}

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module github.com/lightningequipment/circuitbreaker
go 1.13
require (
github.com/btcsuite/btcutil v1.0.2
github.com/lightninglabs/protobuf-hex-display v1.3.3-0.20191212020323-b444784ce75d
github.com/lightningnetwork/lnd v0.11.1-beta.rc3
github.com/urfave/cli v1.22.4
go.uber.org/zap v1.14.1
google.golang.org/grpc v1.27.0
google.golang.org/protobuf v1.25.0 // indirect
gopkg.in/macaroon.v2 v2.1.0
gopkg.in/yaml.v2 v2.2.3
)

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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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git.schwanenlied.me/yawning/bsaes.git v0.0.0-20180720073208-c0276d75487e/go.mod h1:BWqTsj8PgcPriQJGl7el20J/7TuT1d/hSyFDXMEpoEo=
github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
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github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
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github.com/miekg/dns v0.0.0-20171125082028-79bfde677fa8 h1:PRMAcldsl4mXKJeRNB/KVNz6TlbS6hk2Rs42PqgU3Ws=
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github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
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github.com/urfave/cli v1.22.4/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
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go.mongodb.org/mongo-driver v1.0.3/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
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golang.org/x/crypto v0.0.0-20170930174604-9419663f5a44/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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golang.org/x/crypto v0.0.0-20200709230013-948cd5f35899/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
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golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
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golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20191002035440-2ec189313ef0 h1:2mqDk8w/o6UmeUCu5Qiq2y7iMf6anbx+YA8d1JFoFrs=
golang.org/x/net v0.0.0-20191002035440-2ec189313ef0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190209173611-3b5209105503/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5 h1:LfCXLvNmTYH9kEmVgqbnsWfruoXZIrh4YBgqVHtDvw0=
golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2 h1:z99zHgr7hKfrUcX/KsoJk5FJfjTceCKIp96+biqP4To=
golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2 h1:+DCIGbF/swA92ohVg0//6X2IVY3KZs6p9mix0ziNYJM=
golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/tools v0.0.0-20180828015842-6cd1fcedba52/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5 h1:hKsoRgsbwY1NafxrwTs+k64bikrLBkAgPir1TNCj3Zs=
golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20190927181202-20e1ac93f88c h1:hrpEMCZ2O7DR5gC1n2AJGVhrwiEjOi35+jxtIuZpTMo=
google.golang.org/genproto v0.0.0-20190927181202-20e1ac93f88c/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
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google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
google.golang.org/grpc v1.18.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
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google.golang.org/grpc v1.24.0 h1:vb/1TCsVn3DcJlQ0Gs1yB1pKI6Do2/QNwxdKqmc/b0s=
google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
google.golang.org/grpc v1.27.0 h1:rRYRFMVgRv6E0D70Skyfsr28tDXIuuPZyWGMPdMcnXg=
google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v1 v1.0.1 h1:oQFRXzZ7CkBGdm1XZm/EbQYaYNNEElNBOd09M6cqNso=
gopkg.in/errgo.v1 v1.0.1/go.mod h1:3NjfXwocQRYAPTq4/fzX+CwUhPRcR/azYRhj8G+LqMo=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/macaroon-bakery.v2 v2.0.1 h1:0N1TlEdfLP4HXNCg7MQUMp5XwvOoxk+oe9Owr2cpvsc=
gopkg.in/macaroon-bakery.v2 v2.0.1/go.mod h1:B4/T17l+ZWGwxFSZQmlBwp25x+og7OkhETfr3S9MbIA=
gopkg.in/macaroon.v2 v2.0.0/go.mod h1:+I6LnTMkm/uV5ew/0nsulNjL16SK4+C8yDmRUzHR17I=
gopkg.in/macaroon.v2 v2.1.0 h1:HZcsjBCzq9t0eBPMKqTN/uSN6JOm78ZJ2INbqcBQOUI=
gopkg.in/macaroon.v2 v2.1.0/go.mod h1:OUb+TQP/OP0WOerC2Jp/3CwhIKyIa9kQjuc7H24e6/o=
gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22 h1:VpOs+IwYnYBaFnrNAeB8UUWtL3vEUnzSCL1nVjPhqrw=
gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.3 h1:fvjTMHxHEw/mxHbtzPi3JCcKXQRAnQTBRo6YCJSVHKI=
gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

130
lndclient.go Normal file
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package main
import (
"context"
"fmt"
"io/ioutil"
"github.com/lightningnetwork/lnd/routing/route"
"go.uber.org/zap"
"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
"github.com/lightningnetwork/lnd/lncfg"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/macaroons"
"github.com/urfave/cli"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"gopkg.in/macaroon.v2"
)
type lndclient struct {
conn *grpc.ClientConn
main lnrpc.LightningClient
router routerrpc.RouterClient
}
func newLndClient(ctx *cli.Context) (*lndclient, error) {
// First, we'll parse the args from the command.
tlsCertPath, macPath, err := extractPathArgs(ctx)
if err != nil {
return nil, err
}
// Load the specified TLS certificate and build transport credentials
// with it.
creds, err := credentials.NewClientTLSFromFile(tlsCertPath, "")
if err != nil {
return nil, err
}
// Create a dial options array.
opts := []grpc.DialOption{
grpc.WithTransportCredentials(creds),
}
// Load the specified macaroon file.
macBytes, err := ioutil.ReadFile(macPath)
if err != nil {
return nil, fmt.Errorf("unable to read macaroon path (check "+
"the network setting!): %v", err)
}
mac := &macaroon.Macaroon{}
if err = mac.UnmarshalBinary(macBytes); err != nil {
return nil, fmt.Errorf("unable to decode macaroon: %v", err)
}
// Now we append the macaroon credentials to the dial options.
cred := macaroons.NewMacaroonCredential(mac)
opts = append(opts, grpc.WithPerRPCCredentials(cred))
// We need to use a custom dialer so we can also connect to unix sockets
// and not just TCP addresses.
genericDialer := lncfg.ClientAddressDialer(defaultRPCPort)
opts = append(opts, grpc.WithContextDialer(genericDialer))
opts = append(opts, grpc.WithDefaultCallOptions(maxMsgRecvSize))
conn, err := grpc.Dial(ctx.GlobalString("rpcserver"), opts...)
if err != nil {
return nil, fmt.Errorf(
"unable to connect to RPC server: %v", err)
}
return &lndclient{
conn: conn,
main: lnrpc.NewLightningClient(conn),
router: routerrpc.NewRouterClient(conn),
}, nil
}
func (l *lndclient) getIdentity() (route.Vertex, error) {
ctx, cancel := context.WithTimeout(ctxb, rpcTimeout)
defer cancel()
info, err := l.main.GetInfo(ctx, &lnrpc.GetInfoRequest{})
if err != nil {
return route.Vertex{}, err
}
return route.NewVertexFromStr(info.IdentityPubkey)
}
type channelEdge struct {
node1Pub, node2Pub route.Vertex
}
func (l *lndclient) getChanInfo(channel uint64) (*channelEdge, error) {
ctx, cancel := context.WithTimeout(ctxb, rpcTimeout)
defer cancel()
log.Debug("Retrieving channel info", zap.Uint64("channel", channel))
info, err := l.main.GetChanInfo(ctx, &lnrpc.ChanInfoRequest{
ChanId: channel,
})
if err != nil {
return nil, err
}
node1Pub, err := route.NewVertexFromStr(info.Node1Pub)
if err != nil {
return nil, err
}
node2Pub, err := route.NewVertexFromStr(info.Node2Pub)
if err != nil {
return nil, err
}
return &channelEdge{
node1Pub: node1Pub,
node2Pub: node2Pub,
}, nil
}
func (l *lndclient) close() {
l.conn.Close()
}

15
log.go Normal file
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package main
import (
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
var log *zap.Logger
func init() {
config := zap.NewDevelopmentConfig()
config.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
config.EncoderConfig.EncodeCaller = nil
log, _ = config.Build()
}

171
main.go Normal file
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package main
import (
"fmt"
"os"
"os/user"
"path/filepath"
"strings"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/build"
"github.com/urfave/cli"
"go.uber.org/zap"
"google.golang.org/grpc"
)
const (
defaultDataDir = "data"
defaultChainSubDir = "chain"
defaultTLSCertFilename = "tls.cert"
defaultMacaroonFilename = "admin.macaroon"
defaultRPCPort = "10009"
defaultRPCHostPort = "localhost:" + defaultRPCPort
chain = "bitcoin"
confFn = "circuitbreaker.yaml"
)
var (
defaultLndDir = btcutil.AppDataDir("lnd", false)
defaultTLSCertPath = filepath.Join(defaultLndDir, defaultTLSCertFilename)
// maxMsgRecvSize is the largest message our client will receive. We
// set this to 200MiB atm.
maxMsgRecvSize = grpc.MaxCallRecvMsgSize(1 * 1024 * 1024 * 200)
)
// extractPathArgs parses the TLS certificate and macaroon paths from the
// command.
func extractPathArgs(ctx *cli.Context) (string, string, error) {
network := strings.ToLower(ctx.GlobalString("network"))
switch network {
case "mainnet", "testnet", "regtest", "simnet":
default:
return "", "", fmt.Errorf("unknown network: %v", network)
}
// We'll now fetch the lnddir so we can make a decision on how to
// properly read the macaroons (if needed) and also the cert. This will
// either be the default, or will have been overwritten by the end
// user.
lndDir := cleanAndExpandPath(ctx.GlobalString("lnddir"))
// If the macaroon path as been manually provided, then we'll only
// target the specified file.
var macPath string
if ctx.GlobalString("macaroonpath") != "" {
macPath = cleanAndExpandPath(ctx.GlobalString("macaroonpath"))
} else {
// Otherwise, we'll go into the path:
// lnddir/data/chain/<chain>/<network> in order to fetch the
// macaroon that we need.
macPath = filepath.Join(
lndDir, defaultDataDir, defaultChainSubDir, chain,
network, defaultMacaroonFilename,
)
}
tlsCertPath := cleanAndExpandPath(ctx.GlobalString("tlscertpath"))
// If a custom lnd directory was set, we'll also check if custom paths
// for the TLS cert and macaroon file were set as well. If not, we'll
// override their paths so they can be found within the custom lnd
// directory set. This allows us to set a custom lnd directory, along
// with custom paths to the TLS cert and macaroon file.
if lndDir != defaultLndDir {
tlsCertPath = filepath.Join(lndDir, defaultTLSCertFilename)
}
return tlsCertPath, macPath, nil
}
func main() {
defaultAppDir := btcutil.AppDataDir("circuitbreaker", false)
app := cli.NewApp()
app.Name = "circuitbreaker"
app.Version = build.Version() + " commit=" + build.Commit
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "rpcserver",
Value: defaultRPCHostPort,
Usage: "host:port of ln daemon",
},
cli.StringFlag{
Name: "lnddir",
Value: defaultLndDir,
Usage: "path to lnd's base directory",
},
cli.StringFlag{
Name: "tlscertpath",
Value: defaultTLSCertPath,
Usage: "path to TLS certificate",
},
cli.StringFlag{
Name: "network, n",
Usage: "the network lnd is running on e.g. mainnet, " +
"testnet, etc.",
Value: "mainnet",
},
cli.StringFlag{
Name: "macaroonpath",
Usage: "path to macaroon file",
},
cli.StringFlag{
Name: "configdir",
Value: defaultAppDir,
Usage: "path to CircuitBreaker's base directory",
},
}
app.Action = func(c *cli.Context) error {
configPath := filepath.Join(c.String("configdir"), confFn)
loader := newConfigLoader(configPath)
config, err := loader.load()
if err != nil {
return err
}
client, err := newLndClient(c)
if err != nil {
return err
}
defer client.close()
p := newProcess()
return p.run(client, config)
}
if err := app.Run(os.Args); err != nil {
log.Error("Unexpected exit", zap.Error(err))
}
}
// 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
user, err := user.Current()
if err == nil {
homeDir = user.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))
}

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process.go Normal file
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package main
import (
"context"
"errors"
"time"
"github.com/lightninglabs/protobuf-hex-display/jsonpb"
"github.com/lightninglabs/protobuf-hex-display/proto"
"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
"github.com/lightningnetwork/lnd/routing/route"
"go.uber.org/zap"
)
const maxPending = 1
var (
rpcTimeout = 10 * time.Second
ctxb = context.Background()
)
type circuitKey struct {
channel uint64
htlc uint64
}
type interceptEvent struct {
circuitKey
resume chan bool
}
type process struct {
client *lndclient
interceptChan chan interceptEvent
resolveChan chan circuitKey
identity route.Vertex
pubkeyMap map[uint64]route.Vertex
}
func newProcess() *process {
return &process{
interceptChan: make(chan interceptEvent),
resolveChan: make(chan circuitKey),
pubkeyMap: make(map[uint64]route.Vertex),
}
}
func (p *process) run(client *lndclient, cfg *config) error {
log.Info("CircuitBreaker started")
p.client = client
var err error
p.identity, err = p.client.getIdentity()
if err != nil {
return err
}
log.Info("Connected to lnd node",
zap.String("pubkey", p.identity.String()))
stream, err := p.client.router.SubscribeHtlcEvents(
ctxb, &routerrpc.SubscribeHtlcEventsRequest{},
)
if err != nil {
return err
}
interceptor, err := p.client.router.HtlcInterceptor(ctxb)
if err != nil {
return err
}
log.Info("Interceptor/notification handlers registered")
go func() {
err := p.processHtlcEvents(stream)
if err != nil {
log.Error("htlc events error", zap.Error(err))
}
}()
go func() {
err := p.processInterceptor(interceptor)
if err != nil {
log.Error("interceptor error", zap.Error(err))
}
}()
return p.eventLoop(cfg)
}
func (p *process) eventLoop(cfg *config) error {
pendingHtlcs := make(map[route.Vertex]map[circuitKey]struct{})
for {
select {
case interceptEvent := <-p.interceptChan:
peer, err := p.getPubKey(interceptEvent.channel)
if err != nil {
return err
}
pending, ok := pendingHtlcs[peer]
if !ok {
pending = make(map[circuitKey]struct{})
pendingHtlcs[peer] = pending
}
maxPending, ok := cfg.MaxPendingHtlcsPerPeer[peer]
if !ok {
maxPending = cfg.MaxPendingHtlcs
}
if len(pending) >= maxPending {
log.Info("Rejecting htlc",
zap.Uint64("channel", interceptEvent.channel),
zap.Uint64("htlc", interceptEvent.htlc),
zap.String("peer", peer.String()),
zap.Int("pending_htlcs", len(pending)),
zap.Int("max_pending_htlcs", maxPending),
)
interceptEvent.resume <- false
continue
}
pending[interceptEvent.circuitKey] = struct{}{}
log.Info("Forwarding htlc",
zap.Uint64("channel", interceptEvent.channel),
zap.Uint64("htlc", interceptEvent.htlc),
zap.String("peer", peer.String()),
zap.Int("pending_htlcs", len(pending)),
zap.Int("max_pending_htlcs", maxPending),
)
interceptEvent.resume <- true
case resolvedKey := <-p.resolveChan:
peer, err := p.getPubKey(resolvedKey.channel)
if err != nil {
return err
}
pending, ok := pendingHtlcs[peer]
if !ok {
continue
}
if _, ok := pending[resolvedKey]; !ok {
continue
}
delete(pending, resolvedKey)
log.Info("Resolving htlc",
zap.Uint64("channel", resolvedKey.channel),
zap.Uint64("htlc", resolvedKey.htlc),
zap.String("peer", peer.String()),
zap.Int("pending_htlcs", len(pending)))
}
}
}
func (p *process) processHtlcEvents(stream routerrpc.Router_SubscribeHtlcEventsClient) error {
for {
event, err := stream.Recv()
if err != nil {
return err
}
if event.EventType != routerrpc.HtlcEvent_FORWARD {
continue
}
switch event.Event.(type) {
case *routerrpc.HtlcEvent_SettleEvent:
p.resolveChan <- circuitKey{
channel: event.IncomingChannelId,
htlc: event.IncomingHtlcId,
}
case *routerrpc.HtlcEvent_ForwardFailEvent:
p.resolveChan <- circuitKey{
channel: event.IncomingChannelId,
htlc: event.IncomingHtlcId,
}
}
}
}
func (p *process) processInterceptor(interceptor routerrpc.Router_HtlcInterceptorClient) error {
for {
event, err := interceptor.Recv()
if err != nil {
return err
}
resumeChan := make(chan bool)
p.interceptChan <- interceptEvent{
circuitKey: circuitKey{
channel: event.IncomingCircuitKey.ChanId,
htlc: event.IncomingCircuitKey.HtlcId,
},
resume: resumeChan,
}
resume, ok := <-resumeChan
if !ok {
return errors.New("resume channel closed")
}
response := &routerrpc.ForwardHtlcInterceptResponse{
IncomingCircuitKey: event.IncomingCircuitKey,
}
if resume {
response.Action = routerrpc.ResolveHoldForwardAction_RESUME
} else {
response.Action = routerrpc.ResolveHoldForwardAction_FAIL
}
err = interceptor.Send(response)
if err != nil {
return err
}
}
}
func (p *process) getPubKey(channel uint64) (route.Vertex, error) {
pubkey, ok := p.pubkeyMap[channel]
if ok {
return pubkey, nil
}
edge, err := p.client.getChanInfo(channel)
if err != nil {
return route.Vertex{}, err
}
var remotePubkey route.Vertex
switch {
case edge.node1Pub == p.identity:
remotePubkey = edge.node2Pub
case edge.node2Pub == p.identity:
remotePubkey = edge.node1Pub
default:
return route.Vertex{}, errors.New("identity not found in chan info")
}
p.pubkeyMap[channel] = remotePubkey
return remotePubkey, nil
}
func jsonToString(resp proto.Message) (string, error) {
jsonMarshaler := &jsonpb.Marshaler{
EmitDefaults: true,
OrigName: true,
Indent: " ",
}
jsonStr, err := jsonMarshaler.MarshalToString(resp)
if err != nil {
return "", err
}
return jsonStr, nil
}