Implement a holepunch transport (#313)

* Implement `stcp` with address resolving (`stcpr`) and encryption
* Implement `stcp` with TCP hole punching (`stcph`) and encryption
* Add encryption for all `stcp`

.golangci.yml

@@ -145,6 +145,8 @@ linters-settings:
     simple: true
     range-loops: true # Report preallocation suggestions on range loops, true by default
     for-loops: false # Report preallocation suggestions on for loops, false by default
+  goimports:
+    local-prefixes: github.com/SkycoinProject/skywire-mainnet
 
 
 linters:

.goreleaser.yml

@@ -16,6 +16,9 @@ builds:
       - arm
     goarm:
       - 7
+    ignore:
+      - goos: darwin
+        goarch: 386
     env:
       - CGO_ENABLED=0
     main: ./cmd/skywire-visor/
@@ -32,6 +35,9 @@ builds:
       - arm
     goarm:
       - 7
+    ignore:
+      - goos: darwin
+        goarch: 386
     env:
       - CGO_ENABLED=0
     main: ./cmd/skywire-cli/
@@ -48,6 +54,9 @@ builds:
       - arm
     goarm:
       - 7
+    ignore:
+      - goos: darwin
+        goarch: 386
     env:
       - CGO_ENABLED=0
     main: ./cmd/hypervisor/
@@ -64,6 +73,9 @@ builds:
       - arm
     goarm:
       - 7
+    ignore:
+      - goos: darwin
+        goarch: 386
     env:
       - CGO_ENABLED=0
     main: ./cmd/apps/skychat/
@@ -80,6 +92,9 @@ builds:
       - arm
     goarm:
       - 7
+    ignore:
+      - goos: darwin
+        goarch: 386
     env:
       - CGO_ENABLED=0
     main: ./cmd/apps/skysocks/
@@ -96,6 +111,9 @@ builds:
       - arm
     goarm:
       - 7
+    ignore:
+      - goos: darwin
+        goarch: 386
     env:
       - CGO_ENABLED=0
     main: ./cmd/apps/skysocks-client/

README.md

@@ -24,7 +24,8 @@
 
 ### Requirements
 
-Skywire requires a version of [golang](https://golang.org/) with [go modules](https://github.com/golang/go/wiki/Modules) support.
+Skywire requires a version of [golang](https://golang.org/) 
+with [go modules](https://github.com/golang/go/wiki/Modules) support.
 
 ### Build
 
@@ -52,15 +53,18 @@ $ skywire-cli visor gen-config
 
 Additional options are displayed when `skywire-cli visor gen-config -h` is run.
 
-If you are trying to test features from the develop branch, you should use the `-t ` flag when generating config files for either `skywire-visor` or `hypervisor`. 
+If you are trying to test features from the develop branch, 
+you should use the `-t ` flag when generating config files for either `skywire-visor` or `hypervisor`. 
 
 We will cover certain fields of the configuration file below.
 
 #### `stcp` setup
 
 With `stcp`, you can establish *skywire transports* to other skywire visors with the `tcp` protocol.
 
-As visors are identified with public keys and not IP addresses, we need to directly define the associations between IP address and public keys. This is done via the configuration file for `skywire-visor`.
+As visors are identified with public keys and not IP addresses, 
+we need to directly define the associations between IP address and public keys. 
+This is done via the configuration file for `skywire-visor`.
 
 ```json
 {
@@ -76,19 +80,29 @@ As visors are identified with public keys and not IP addresses, we need to direc
 
 In the above example, we have two other visors running on localhost (that we wish to connect to via `stcp`).
 - The field `stcp.pk_table` holds the associations of `<public_key>` to `<ip_address>:<port>`.
-- The field `stcp.local_address` should only be specified if you want the visor in question to listen for incoming `stcp` connection.
+- The field `stcp.local_address` should only be specified if you want the visor in question to listen for incoming 
+`stcp` connection.
 
 #### `hypervisor` setup
 
-Every node can be controlled by one or more hypervisors. The hypervisor allows to control and configure multiple visors. In order to allow a hypervisor to access a visor, the address and PubKey of the hypervisor needs to be configured first on the visor. Here is an example configuration: 
+Every node can be controlled by one or more hypervisors. The hypervisor allows to control and configure multiple visors. 
+In order to allow a hypervisor to access a visor, 
+the address and PubKey of the hypervisor needs to be configured first on the visor. Here is an example configuration: 
 
 ```json
-  "hypervisors":[{"public_key":"02b72766f0ebade8e06d6969b5aeedaff8bf8efd7867f362bb4a63135ab6009775"}],
+{
+  "hypervisors": [{
+    "public_key":"02b72766f0ebade8e06d6969b5aeedaff8bf8efd7867f362bb4a63135ab6009775"
+  }]
+}
 ```
 
 ### Run `skywire-visor`
 
-`skywire-visor` hosts apps, proxies app's requests to remote visors and exposes communication API that apps can use to implement communication protocols. App binaries are spawned by the visor, communication between visor and app is performed via unix pipes provided on app startup.
+`skywire-visor` hosts apps, proxies app's requests to remote visors and exposes communication API 
+that apps can use to implement communication protocols. 
+App binaries are spawned by the visor, 
+communication between visor and app is performed via unix pipes provided on app startup.
 
 Note that `skywire-visor` requires a valid configuration file in order to execute.
 
@@ -160,7 +174,9 @@ And then simply run skywire from the opened terminal.
 
 ### Apps
 
-After `skywire-visor` is up and running with default environment, default apps are run with the configuration specified in `skywire-config.json`. Refer to the following for usage of the apps:
+After `skywire-visor` is up and running with default environment, 
+default apps are run with the configuration specified in `skywire-config.json`. 
+Refer to the following for usage of the apps:
 
 - [Skychat](/cmd/apps/skychat)
 - [Skysocks](/cmd/apps/skysocks) ([Client](/cmd/apps/skysocks-client))
@@ -222,7 +238,8 @@ Full info on each call input and output may be found in the [corresponding file]
 
 ### Transports
 
-In order for a local Skywire App to communicate with an App running on a remote Skywire visor, a transport to that remote Skywire visor needs to be established.
+In order for a local Skywire App to communicate with an App running on a remote Skywire visor, 
+a transport to that remote Skywire visor needs to be established.
 
 Transports can be established via the `skywire-cli`.
 
@@ -245,7 +262,8 @@ We use [goreleaser](https://goreleaser.com) for creating them.
 1. Make sure that `git` and [goreleaser](https://goreleaser.com/install) are installed.
 2. Checkout to a commit you would like to create a release against.
 3. Make sure that `git status` is in clean state.
-4. Create a `git` tag with desired release version and release name: `git tag -a 0.1.0 -m "First release"`, where `0.1.0` is release version and `First release` is release name.
+4. Create a `git` tag with desired release version and release name: `git tag -a 0.1.0 -m "First release"`, 
+where `0.1.0` is release version and `First release` is release name.
 5. Push the created tag to the repository: `git push origin 0.1.0`, where `0.1.0` is release version.
 6. [Issue a personal GitHub access token.](https://github.com/settings/tokens)
 7. Run `GITHUB_TOKEN=your_token make github-release` 

ci_scripts/run-pkg-tests.sh

@@ -70,7 +70,6 @@ go clean -testcache &> /dev/null || go test -race -tags no_ci -cover -timeout=5m
 go clean -testcache &> /dev/null || go test -race -tags no_ci -cover -timeout=5m github.com/SkycoinProject/skywire-mainnet/pkg/transport -run TestTransportManagerReEstablishTransports >> ./logs/pkg/TestTransportManagerReEstablishTransports.log
 go clean -testcache &> /dev/null || go test -race -tags no_ci -cover -timeout=5m github.com/SkycoinProject/skywire-mainnet/pkg/transport -run TestTransportManagerLogs >> ./logs/pkg/TestTransportManagerLogs.log
 go clean -testcache &> /dev/null || go test -race -tags no_ci -cover -timeout=5m github.com/SkycoinProject/skywire-mainnet/pkg/transport -run TestTCPFactory >> ./logs/pkg/TestTCPFactory.log
-go clean -testcache &> /dev/null || go test -race -tags no_ci -cover -timeout=5m github.com/SkycoinProject/skywire-mainnet/pkg/transport -run TestFilePKTable >> ./logs/pkg/TestFilePKTable.log
 go clean -testcache &> /dev/null || go test -race -tags no_ci -cover -timeout=5m github.com/SkycoinProject/skywire-mainnet/pkg/transport-discovery/client -run TestClientAuth >> ./logs/pkg/TestClientAuth.log
 go clean -testcache &> /dev/null || go test -race -tags no_ci -cover -timeout=5m github.com/SkycoinProject/skywire-mainnet/pkg/transport-discovery/client -run TestRegisterTransportResponses >> ./logs/pkg/TestRegisterTransportResponses.log
 go clean -testcache &> /dev/null || go test -race -tags no_ci -cover -timeout=5m github.com/SkycoinProject/skywire-mainnet/pkg/transport-discovery/client -run TestRegisterTransports >> ./logs/pkg/TestRegisterTransports.log

cmd/setup-node/commands/root.go

@@ -55,7 +55,7 @@ var rootCmd = &cobra.Command{
 			}
 			rdr, err = os.Open(configFile)
 			if err != nil {
-				log.Fatalf("Failed to open config: %s", err)
+				log.Fatalf("Failed to open config: %v", err)
 			}
 		} else {
 			logger.Info("Reading config from STDIN")

cmd/skywire-cli/commands/visor/transports.go

@@ -13,6 +13,8 @@ import (
 
 	"github.com/SkycoinProject/skywire-mainnet/cmd/skywire-cli/internal"
 	"github.com/SkycoinProject/skywire-mainnet/pkg/snet/stcp"
+	"github.com/SkycoinProject/skywire-mainnet/pkg/snet/stcph"
+	"github.com/SkycoinProject/skywire-mainnet/pkg/snet/stcpr"
 	"github.com/SkycoinProject/skywire-mainnet/pkg/visor"
 )
 
@@ -80,7 +82,9 @@ var (
 
 func init() {
 	const (
-		typeFlagUsage    = "type of transport to add; if unspecified, cli will attempt to establish a transport in the following order: stcp, dmsg"
+		// TODO: add stcpr implementation
+		typeFlagUsage = "type of transport to add; if unspecified, cli will attempt to establish a transport " +
+			"in the following order: stcp, stcpr, stcph, dmsg"
 		publicFlagUsage  = "whether to make the transport public"
 		timeoutFlagUsage = "if specified, sets an operation timeout"
 	)
@@ -108,22 +112,22 @@ var addTpCmd = &cobra.Command{
 
 			logger.Infof("Established %v transport to %v", transportType, pk)
 		} else {
-			transportType = stcp.Type
-
-			tp, err = rpcClient().AddTransport(pk, transportType, public, timeout)
-			if err != nil {
-				logger.WithError(err).
-					Warnf("Failed to establish stcp transport. Trying to establish dmsg transport")
-
-				transportType = dmsg.Type
+			transportTypes := []string{
+				stcp.Type,
+				stcpr.Type,
+				stcph.Type,
+				dmsg.Type,
+			}
 
+			for _, transportType := range transportTypes {
 				tp, err = rpcClient().AddTransport(pk, transportType, public, timeout)
-				if err != nil {
-					logger.WithError(err).Fatalf("Failed to establish dmsg transport")
+				if err == nil {
+					logger.Infof("Established %v transport to %v", transportType, pk)
+					break
 				}
-			}
 
-			logger.Infof("Established %v transport to %v", transportType, pk)
+				logger.WithError(err).Warnf("Failed to establish %v transport", transportType)
+			}
 		}
 
 		printTransports(tp)

cmd/skywire-cli/skywire-cli.go

@@ -1,6 +1,3 @@
-/*
-CLI for skywire visor
-*/
 package main
 
 import (

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/google/uuid v1.1.1
 	github.com/gorilla/securecookie v1.1.1
 	github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect
-	github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect
+	github.com/libp2p/go-reuseport v0.0.1
 	github.com/mholt/archiver/v3 v3.3.0
 	github.com/pkg/profile v1.3.0
 	github.com/prometheus/client_golang v1.3.0
@@ -21,12 +21,13 @@ require (
 	github.com/sirupsen/logrus v1.5.0
 	github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8
 	github.com/spf13/cobra v0.0.5
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.5.1
 	go.etcd.io/bbolt v1.3.4
 	golang.org/x/crypto v0.0.0-20200427165652-729f1e841bcc // indirect
-	golang.org/x/net v0.0.0-20200226121028-0de0cce0169b
+	golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e
 	golang.org/x/sys v0.0.0-20200428200454-593003d681fa // indirect
 	golang.zx2c4.com/wireguard v0.0.20200320
+	nhooyr.io/websocket v1.8.2
 )
 
 // Uncomment for tests with alternate branches of 'dmsg'

go.sum

@@ -2,8 +2,6 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/SkycoinProject/dmsg v0.0.0-20200306152741-acee74fa4514/go.mod h1:DzykXMLlx6Fx0fGjZsCIRas/MIvxW8DZpmDA6f2nCRk=
-github.com/SkycoinProject/dmsg v0.1.1-0.20200523194607-be73f083a729 h1:Edgnt4ido4MGfNTEJUYqNeXt0AlJ4EHlFCWBrKYPvT4=
-github.com/SkycoinProject/dmsg v0.1.1-0.20200523194607-be73f083a729/go.mod h1:MiX+UG/6fl3g+9rS13/fq7BwUQ2eOlg1yOBOnNf6J6A=
 github.com/SkycoinProject/dmsg v0.2.2 h1:dVsenV5YvvP1Ptm0keproi/c6nA07FU6UntsFBga/74=
 github.com/SkycoinProject/dmsg v0.2.2/go.mod h1:ze0XfdlLo3wtaK7caRqFipkRxEOZDqfgdPDARqG/jZs=
 github.com/SkycoinProject/skycoin v0.26.0/go.mod h1:xqPLOKh5B6GBZlGA7B5IJfQmCy7mwimD9NlqxR3gMXo=
@@ -130,6 +128,8 @@ github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfn
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/libp2p/go-reuseport v0.0.1 h1:7PhkfH73VXfPJYKQ6JwS5I/eVcoyYi9IMNGc6FWpFLw=
+github.com/libp2p/go-reuseport v0.0.1/go.mod h1:jn6RmB1ufnQwl0Q1f+YxAj8isJgDCQzaaxIFYDhcYEA=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
@@ -164,6 +164,7 @@ github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/9
 github.com/pierrec/lz4 v2.0.5+incompatible h1:2xWsjqPFWcplujydGg4WmhC/6fZqK42wMM8aXeqhl0I=
 github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/profile v1.3.0 h1:OQIvuDgm00gWVWGTf4m4mCt6W1/0YqU7Ntg0mySWgaI=
 github.com/pkg/profile v1.3.0/go.mod h1:hJw3o1OdXxsrSjjVksARp5W95eeEaEfptyVZyv6JUPA=
@@ -222,6 +223,8 @@ github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXf
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
@@ -259,8 +262,8 @@ golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR
 golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191003171128-d98b1b443823/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191204025024-5ee1b9f4859a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200226121028-0de0cce0169b h1:0mm1VjtFUOIlE1SbDlwjYaDxZVDP2S5ou6y0gSgXHu8=
-golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e h1:3G+cUijn7XD+S4eJFddp53Pv7+slrESplyjG25HgL+k=
+golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 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=
@@ -274,6 +277,7 @@ golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/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 v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190228124157-a34e9553db1e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -282,6 +286,7 @@ golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200428200454-593003d681fa h1:yMbJOvnfYkO1dSAviTu/ZguZWLBTXx4xE3LYrxUCCiA=
 golang.org/x/sys v0.0.0-20200428200454-593003d681fa/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -308,6 +313,7 @@ google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ij
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 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/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=