├── .github ├── renovate.json5 └── workflows │ ├── e2e-test.yaml │ ├── go.yaml │ ├── mirror.yaml │ └── release.yaml ├── .gitignore ├── .krew.yaml ├── LICENSE ├── README.md ├── cmd └── kubectl-external_forward │ └── main.go ├── docs └── diagram.svg ├── e2e_test ├── Makefile └── main.go ├── go.mod ├── go.sum └── pkg ├── cmd └── cmd.go ├── di ├── di.go └── wire_gen.go ├── envoy ├── config.go ├── config_test.go └── template │ └── envoy.yaml ├── externalforwarder ├── external_forwarder.go └── pod.go ├── portforwarder ├── mock_portforwarder │ └── mock_portforwarder.go └── port_forwarder.go └── tunnel └── tunnel.go /.github/renovate.json5: -------------------------------------------------------------------------------- 1 | { 2 | "$schema": "https://docs.renovatebot.com/renovate-schema.json", 3 | "extends": [ 4 | "github>int128/renovate-base", 5 | "github>int128/go-renovate-config", 6 | "github>int128/go-renovate-config:kubernetes", 7 | ], 8 | } 9 | -------------------------------------------------------------------------------- /.github/workflows/e2e-test.yaml: -------------------------------------------------------------------------------- 1 | name: e2e-test 2 | 3 | on: 4 | push: 5 | branches: 6 | - master 7 | paths: 8 | - .github/workflows/e2e-test.yaml 9 | - pkg/** 10 | - cmd/** 11 | - e2e_test/** 12 | - go.* 13 | pull_request: 14 | branches: 15 | - master 16 | paths: 17 | - .github/workflows/e2e-test.yaml 18 | - pkg/** 19 | - cmd/** 20 | - e2e_test/** 21 | - go.* 22 | 23 | jobs: 24 | e2e-test: 25 | runs-on: ubuntu-latest 26 | timeout-minutes: 15 27 | steps: 28 | - uses: actions/checkout@v3 29 | - uses: actions/setup-go@v3 30 | with: 31 | go-version: 1.20.1 32 | cache: true 33 | - run: go build ./cmd/kubectl-external_forward 34 | - run: make -C e2e_test cluster 35 | - run: make -C e2e_test 36 | -------------------------------------------------------------------------------- /.github/workflows/go.yaml: -------------------------------------------------------------------------------- 1 | name: go 2 | 3 | on: 4 | push: 5 | branches: 6 | - master 7 | paths: 8 | - .github/workflows/go.yaml 9 | - pkg/** 10 | - cmd/** 11 | - go.* 12 | tags: 13 | - v* 14 | pull_request: 15 | branches: 16 | - master 17 | paths: 18 | - .github/workflows/go.yaml 19 | - pkg/** 20 | - cmd/** 21 | - go.* 22 | 23 | jobs: 24 | lint: 25 | runs-on: ubuntu-latest 26 | timeout-minutes: 10 27 | steps: 28 | - uses: actions/checkout@v3 29 | - uses: actions/setup-go@v3 30 | with: 31 | go-version: 1.20.1 32 | cache: true 33 | - uses: golangci/golangci-lint-action@v3 34 | with: 35 | version: v1.51.1 36 | args: --timeout=3m 37 | 38 | tidy: 39 | runs-on: ubuntu-latest 40 | timeout-minutes: 10 41 | steps: 42 | - uses: actions/checkout@v3 43 | with: 44 | ref: ${{ github.head_ref }} 45 | - uses: actions/setup-go@v3 46 | with: 47 | go-version: 1.20.1 48 | cache: true 49 | - run: go mod tidy 50 | - uses: int128/update-generated-files-action@v2 51 | 52 | test: 53 | runs-on: ubuntu-latest 54 | timeout-minutes: 10 55 | steps: 56 | - uses: actions/checkout@v3 57 | - uses: actions/setup-go@v3 58 | with: 59 | go-version: 1.20.1 60 | cache: true 61 | - run: go test -v -race ./... 62 | -------------------------------------------------------------------------------- /.github/workflows/mirror.yaml: -------------------------------------------------------------------------------- 1 | name: mirror 2 | 3 | on: 4 | pull_request: 5 | branches: 6 | - master 7 | paths: 8 | - .github/workflows/mirror.yaml 9 | schedule: 10 | - cron: 1 0 * * * 11 | 12 | jobs: 13 | image: 14 | runs-on: ubuntu-latest 15 | timeout-minutes: 10 16 | strategy: 17 | matrix: 18 | image: 19 | - src: envoyproxy/envoy:v1.17-latest 20 | dst: ghcr.io/int128/kubectl-external-forward/mirror/envoy 21 | steps: 22 | - uses: actions/checkout@v3 23 | - uses: docker/login-action@v1 24 | with: 25 | registry: ghcr.io 26 | username: ${{ github.repository_owner }} 27 | password: ${{ secrets.GITHUB_TOKEN }} 28 | - run: docker pull ${{ matrix.image.src }} 29 | - run: docker tag ${{ matrix.image.src }} ${{ matrix.image.dst }} 30 | - run: docker push ${{ matrix.image.dst }} 31 | -------------------------------------------------------------------------------- /.github/workflows/release.yaml: -------------------------------------------------------------------------------- 1 | name: release 2 | 3 | on: 4 | push: 5 | branches: 6 | - master 7 | paths: 8 | - .github/workflows/release.yaml 9 | - pkg/** 10 | - cmd/** 11 | - go.* 12 | tags: 13 | - v* 14 | pull_request: 15 | branches: 16 | - master 17 | paths: 18 | - .github/workflows/release.yaml 19 | - pkg/** 20 | - cmd/** 21 | - go.* 22 | 23 | jobs: 24 | build: 25 | strategy: 26 | matrix: 27 | platform: 28 | - runs-on: ubuntu-latest 29 | GOOS: linux 30 | GOARCH: amd64 31 | - runs-on: ubuntu-latest 32 | GOOS: linux 33 | GOARCH: arm64 34 | - runs-on: ubuntu-latest 35 | GOOS: linux 36 | GOARCH: arm 37 | - runs-on: macos-latest 38 | GOOS: darwin 39 | GOARCH: amd64 40 | - runs-on: macos-latest 41 | GOOS: darwin 42 | GOARCH: arm64 43 | - runs-on: windows-latest 44 | GOOS: windows 45 | GOARCH: amd64 46 | runs-on: ${{ matrix.platform.runs-on }} 47 | env: 48 | GOOS: ${{ matrix.platform.GOOS }} 49 | GOARCH: ${{ matrix.platform.GOARCH }} 50 | CGO_ENABLED: 0 51 | timeout-minutes: 10 52 | steps: 53 | - uses: actions/checkout@v3 54 | - uses: actions/setup-go@v3 55 | with: 56 | go-version: 1.20.1 57 | cache: true 58 | - run: go build -ldflags '-X main.version=${{ github.ref_name }}' ./cmd/kubectl-external_forward 59 | - uses: int128/go-actions/release@v1 60 | with: 61 | binary: kubectl-external_forward 62 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .idea/ 2 | 3 | /kubectl-external_forward 4 | e2e_test/output/ 5 | -------------------------------------------------------------------------------- /.krew.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: krew.googlecontainertools.github.com/v1alpha2 2 | kind: Plugin 3 | metadata: 4 | name: external-forward 5 | spec: 6 | homepage: https://github.com/int128/kubectl-external-forward 7 | shortDescription: Connect to external host via cluster 8 | description: | 9 | This allows you to connect from your laptop to a host outside of a cluster. 10 | It is useful when a host such as database is in a private network and unreachable from your laptop. 11 | While `kubectl port-forward` connects to a pod inside a cluster, this connects to a host outside a cluster. 12 | 13 | This plugin runs a TCP proxy pod on a cluster and set up a port-forwarder on your laptop. 14 | You just run your application with localhost configuration as if a database is running on local. 15 | No proxy configuration such as HTTP_PROXY or SOCKS is needed. 16 | 17 | version: {{ .TagName }} 18 | platforms: 19 | - bin: kubectl-external_forward 20 | {{ addURIAndSha "https://github.com/int128/kubectl-external-forward/releases/download/{{ .TagName }}/kubectl-external_forward_linux_amd64.zip" .TagName }} 21 | selector: 22 | matchLabels: 23 | os: linux 24 | arch: amd64 25 | - bin: kubectl-external_forward 26 | {{ addURIAndSha "https://github.com/int128/kubectl-external-forward/releases/download/{{ .TagName }}/kubectl-external_forward_linux_arm64.zip" .TagName }} 27 | selector: 28 | matchLabels: 29 | os: linux 30 | arch: arm64 31 | - bin: kubectl-external_forward 32 | {{ addURIAndSha "https://github.com/int128/kubectl-external-forward/releases/download/{{ .TagName }}/kubectl-external_forward_linux_arm.zip" .TagName }} 33 | selector: 34 | matchLabels: 35 | os: linux 36 | arch: arm 37 | - bin: kubectl-external_forward 38 | {{ addURIAndSha "https://github.com/int128/kubectl-external-forward/releases/download/{{ .TagName }}/kubectl-external_forward_darwin_amd64.zip" .TagName }} 39 | selector: 40 | matchLabels: 41 | os: darwin 42 | arch: amd64 43 | - bin: kubectl-external_forward 44 | {{ addURIAndSha "https://github.com/int128/kubectl-external-forward/releases/download/{{ .TagName }}/kubectl-external_forward_darwin_arm64.zip" .TagName }} 45 | selector: 46 | matchLabels: 47 | os: darwin 48 | arch: arm64 49 | - bin: kubectl-external_forward 50 | {{ addURIAndSha "https://github.com/int128/kubectl-external-forward/releases/download/{{ .TagName }}/kubectl-external_forward_windows_amd64.zip" .TagName }} 51 | selector: 52 | matchLabels: 53 | os: windows 54 | arch: amd64 55 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright 2021 Hidetake Iwata 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # kubectl-external-forward [![go](https://github.com/int128/kubectl-external-forward/actions/workflows/go.yaml/badge.svg)](https://github.com/int128/kubectl-external-forward/actions/workflows/go.yaml) 2 | 3 | This is a kubectl plugin to connect from your computer to an external host via a proxy pod on a cluster. 4 | It runs [Envoy Proxy](https://www.envoyproxy.io) in a pod and establishes port-forwarding from your computer to a host outside the cluster. 5 | 6 | 7 | ## Deprecated :warning: 8 | 9 | It is recommended to deploy https://github.com/int128/ktunnels into your cluster. 10 | 11 | This plugin has the following issues: 12 | 13 | - Poor experience: It takes a long time to run an Envoy pod. 14 | - Cost: Garbage pod may remain if the plugin could not clean up. It may affect the running cost of your cluster, for example, Cluster Autoscaler keeps a node due to an orphan pod. 15 | 16 | 17 | ## Why 18 | 19 | This allows you to connect from your computer to a host outside of a cluster. 20 | It is useful when a host (such as database or API endpoint) is in a **private network** and **unreachable** from your computer. 21 | While `kubectl port-forward` connects to a pod inside a cluster, this connects to a host outside a cluster. 22 | 23 | This plugin runs a TCP proxy pod on a cluster and set up a port-forwarder on your computer. 24 | You just run your application with localhost configuration as if a database is running on local. 25 | No proxy configuration such as HTTP_PROXY or SOCKS is needed. 26 | 27 | This is an alternative of SSH bastion. 28 | You no longer maintain your bastion servers. 29 | 30 | 31 | ### Use case: run application on computer using remote database 32 | 33 | You can run your application on the local machine using the remote database. 34 | 35 | For example, in our organization, we everyday copy the production database into another one for development (via a snapshot of Amazon Aurora). 36 | It is useful for testing user experience using the production database. 37 | We cannot access our databases directly because they are in the private network for security reason. 38 | 39 | Here is a diagram how we access the development database via the cluster. 40 | 41 | ![diagram](docs/diagram.svg) 42 | 43 | 44 | ## Getting Started 45 | 46 | ### Setup 47 | 48 | Install the latest release from [Homebrew](https://brew.sh/) or [GitHub Releases](https://github.com/int128/kubectl-external-forward/releases). 49 | 50 | ```sh 51 | # Homebrew 52 | brew install int128/tap/kubectl-external-forward 53 | 54 | # Go 1.16+ 55 | go install github.com/int128/kubectl-external-forward/cmd/kubectl-external_forward@latest 56 | ``` 57 | 58 | ### Run 59 | 60 | To connect to a host: 61 | 62 | ```console 63 | % kubectl external-forward 10080:www.example.com:80 64 | I0406 10:40:42.734644 19125 external_forwarder.go:48] creating a pod 65 | I0406 10:40:42.782034 19125 external_forwarder.go:57] created pod default/kubectl-external-forward-txbks 66 | I0406 10:40:42.803104 19125 pod.go:67] pod default/kubectl-external-forward-txbks is still Pending 67 | I0406 10:40:43.368883 19125 pod.go:67] pod default/kubectl-external-forward-txbks is still Pending 68 | I0406 10:40:44.461645 19125 external_forwarder.go:105] starting port-forwarder from 10080 to default/kubectl-external-forward-txbks:10080 69 | ... 70 | Forwarding from 127.0.0.1:10080 -> 10080 71 | Handling connection for 10080 72 | ``` 73 | 74 | To connect to multiple hosts: 75 | 76 | ```sh 77 | kubectl external-forward 15432:postgresql.staging:5432 13306:mysql.staging:3306 78 | ``` 79 | 80 | To listen on 0.0.0.0 (useful for Docker bridge): 81 | 82 | ```sh 83 | kubectl external-forward 0.0.0.0:15432:postgresql.staging:5432 84 | ``` 85 | 86 | Press ctrl-c to stop the command gracefully. It will clean up the proxy pod. 87 | 88 | 89 | ## Considerations 90 | 91 | ### Garbage collection of pod 92 | 93 | This plugin creates a pod running Envoy. 94 | It finally deletes the pod but eventually it may be remaining after stopped. 95 | It would be better to clean up the pods periodically to prevent the resource leak. 96 | 97 | 98 | ### Envoy image 99 | 100 | By default, this plugin creates a pod with [the image on GitHub Container Registry](https://ghcr.io/int128/kubectl-external-forward/mirror/envoy), which is mirrored from [Docker Hub](https://hub.docker.com/r/alpine/socat) everyday in [this workflow](.github/workflows/socat.yaml). 101 | It avoids the rate limit of Docker Hub in your environment. 102 | 103 | 104 | ## Usage 105 | 106 | ```console 107 | kubectl external-forward [flags] [LOCAL_HOST:]LOCAL_PORT:REMOTE_HOST:REMOTE_PORT... 108 | 109 | Flags: 110 | --add_dir_header If true, adds the file directory to the header of the log messages 111 | --alsologtostderr log to standard error as well as files 112 | --as string Username to impersonate for the operation 113 | --as-group stringArray Group to impersonate for the operation, this flag can be repeated to specify multiple groups. 114 | --cache-dir string Default cache directory (default "~/.kube/cache") 115 | --certificate-authority string Path to a cert file for the certificate authority 116 | --client-certificate string Path to a client certificate file for TLS 117 | --client-key string Path to a client key file for TLS 118 | --cluster string The name of the kubeconfig cluster to use 119 | --context string The name of the kubeconfig context to use 120 | -h, --help help for kubectl 121 | --image string Pod image (default "ghcr.io/int128/kubectl-external-forward/mirror/envoy") 122 | --insecure-skip-tls-verify If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure 123 | --kubeconfig string Path to the kubeconfig file to use for CLI requests. 124 | -l, --local-port int local port 125 | --log_backtrace_at traceLocation when logging hits line file:N, emit a stack trace (default :0) 126 | --log_dir string If non-empty, write log files in this directory 127 | --log_file string If non-empty, use this log file 128 | --log_file_max_size uint Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800) 129 | --logtostderr log to standard error instead of files (default true) 130 | -n, --namespace string If present, the namespace scope for this CLI request 131 | --one_output If true, only write logs to their native severity level (vs also writing to each lower severity level) 132 | -r, --remote-host string remote host:port 133 | --request-timeout string The length of time to wait before giving up on a single server request. Non-zero values should contain a corresponding time unit (e.g. 1s, 2m, 3h). A value of zero means don't timeout requests. (default "0") 134 | -s, --server string The address and port of the Kubernetes API server 135 | --skip_headers If true, avoid header prefixes in the log messages 136 | --skip_log_headers If true, avoid headers when opening log files 137 | --stderrthreshold severity logs at or above this threshold go to stderr (default 2) 138 | --tls-server-name string Server name to use for server certificate validation. If it is not provided, the hostname used to contact the server is used 139 | --token string Bearer token for authentication to the API server 140 | --user string The name of the kubeconfig user to use 141 | -v, --v Level number for the log level verbosity 142 | --version version for kubectl 143 | --vmodule moduleSpec comma-separated list of pattern=N settings for file-filtered logging 144 | ``` 145 | 146 | 147 | ## Contributions 148 | 149 | This is an open source software licensed under Apache License 2.0. Feel free to open issues and pull requests for improving code and documents. 150 | -------------------------------------------------------------------------------- /cmd/kubectl-external_forward/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | "os" 6 | 7 | "github.com/int128/kubectl-external-forward/pkg/di" 8 | ) 9 | 10 | var version = "latest" 11 | 12 | func main() { 13 | os.Exit(di.NewCmd().Run(context.Background(), os.Args, version)) 14 | } 15 | -------------------------------------------------------------------------------- /e2e_test/Makefile: -------------------------------------------------------------------------------- 1 | CLUSTER_NAME := kubectl-external-forward-e2e 2 | KUBECONFIG := output/kubeconfig.yaml 3 | export KUBECONFIG 4 | 5 | .PHONY: test 6 | test: cluster 7 | PATH=$(CURDIR)/..:$(PATH) go run . 8 | 9 | .PHONY: cluster 10 | cluster: $(KUBECONFIG) 11 | $(KUBECONFIG): 12 | kind create cluster --name $(CLUSTER_NAME) 13 | # fix error: serviceaccount "default" not found 14 | while ! kubectl get serviceaccount default; do sleep 3; done 15 | 16 | .PHONY: delete-cluster 17 | delete-cluster: 18 | kind delete cluster --name $(CLUSTER_NAME) 19 | -rm $(KUBECONFIG) 20 | -------------------------------------------------------------------------------- /e2e_test/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | "fmt" 6 | "log" 7 | "net/http" 8 | "os" 9 | "os/exec" 10 | "time" 11 | 12 | "github.com/cenkalti/backoff/v4" 13 | "golang.org/x/sync/errgroup" 14 | ) 15 | 16 | func init() { 17 | log.SetFlags(log.Lmicroseconds | log.Lshortfile) 18 | } 19 | 20 | func main() { 21 | ctx := context.Background() 22 | eg, ctx := errgroup.WithContext(ctx) 23 | chInterrupt := make(chan struct{}) 24 | eg.Go(func() error { 25 | defer close(chInterrupt) 26 | b := backoff.NewExponentialBackOff() 27 | b.MaxElapsedTime = 90 * time.Second 28 | b.MaxInterval = 3 * time.Second 29 | notify := func(err error, d time.Duration) { 30 | log.Printf("openRequest: %s", err) 31 | } 32 | return backoff.RetryNotify(func() error { return openRequest(ctx) }, b, notify) 33 | }) 34 | eg.Go(func() error { 35 | if err := runExternalForward(chInterrupt); err != nil { 36 | log.Printf("runExternalForward: %s", err) 37 | return err 38 | } 39 | return nil 40 | }) 41 | if err := eg.Wait(); err != nil { 42 | log.Fatal(err) 43 | } 44 | } 45 | 46 | func runExternalForward(chInterrupt <-chan struct{}) error { 47 | c := exec.Command("kubectl", 48 | "external-forward", 49 | "10000:www.example.com:80", 50 | ) 51 | c.Stdout = os.Stdout 52 | c.Stderr = os.Stderr 53 | if err := c.Start(); err != nil { 54 | return fmt.Errorf("could not start a process: %w", err) 55 | } 56 | log.Printf("started %s", c.String()) 57 | defer func() { 58 | log.Printf("process state %s", c.ProcessState) 59 | }() 60 | <-chInterrupt 61 | if err := c.Process.Signal(os.Interrupt); err != nil { 62 | return fmt.Errorf("could not send SIGINT to the process: %w", err) 63 | } 64 | if err := c.Wait(); err != nil { 65 | return fmt.Errorf("wait error: %w", err) 66 | } 67 | return nil 68 | } 69 | 70 | func openRequest(ctx context.Context) error { 71 | req, err := http.NewRequestWithContext(ctx, "GET", "http://localhost:10000/", nil) 72 | if err != nil { 73 | return fmt.Errorf("could not create a request: %w", err) 74 | } 75 | resp, err := http.DefaultClient.Do(req) 76 | if err != nil { 77 | return fmt.Errorf("http error: %w", err) 78 | } 79 | defer resp.Body.Close() 80 | log.Printf("received a response %s", resp.Status) 81 | return nil 82 | } 83 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/int128/kubectl-external-forward 2 | 3 | go 1.16 4 | 5 | require ( 6 | github.com/cenkalti/backoff/v4 v4.2.0 7 | github.com/golang/mock v1.6.0 8 | github.com/google/go-cmp v0.5.9 9 | github.com/google/wire v0.5.0 10 | github.com/mailru/easyjson v0.7.7 // indirect 11 | github.com/spf13/cobra v1.6.1 12 | github.com/spf13/pflag v1.0.5 13 | golang.org/x/sync v0.1.0 14 | k8s.io/api v0.26.1 15 | k8s.io/apimachinery v0.26.1 16 | k8s.io/cli-runtime v0.26.1 17 | k8s.io/client-go v0.26.1 18 | k8s.io/klog/v2 v2.90.0 19 | ) 20 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 3 | cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= 4 | cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= 5 | cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= 6 | cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= 7 | cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= 8 | cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= 9 | cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= 10 | cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= 11 | cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= 12 | cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= 13 | cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs= 14 | cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc= 15 | cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY= 16 | cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o= 17 | cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE= 18 | cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc= 19 | cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg= 20 | cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc= 21 | cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ= 22 | cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE= 23 | cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk= 24 | cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I= 25 | cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw= 26 | cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA= 27 | cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU= 28 | cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw= 29 | cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos= 30 | cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk= 31 | cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs= 32 | cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0= 33 | dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU= 34 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 35 | github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo= 36 | github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ= 37 | github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0= 38 | github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE= 39 | github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio= 40 | github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs= 41 | github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY= 42 | github.com/cenkalti/backoff/v4 v4.2.0 h1:HN5dHm3WBOgndBH6E8V0q2jIYIR3s9yglV8k/+MN3u4= 43 | github.com/cenkalti/backoff/v4 v4.2.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE= 44 | github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= 45 | 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github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= 280 | github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= 281 | github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= 282 | github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k= 283 | github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k= 284 | github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY= 285 | go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU= 286 | go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8= 287 | go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw= 288 | go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw= 289 | go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw= 290 | 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golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= 300 | golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= 301 | golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8= 302 | golang.org/x/exp v0.0.0-20190829153037-c13cbed26979/go.mod h1:86+5VVa7VpoJ4kLfm080zCjGlMRFzhUhsZKEZO7MGek= 303 | golang.org/x/exp v0.0.0-20191030013958-a1ab85dbe136/go.mod h1:JXzH8nQsPlswgeRAPE3MuO9GYsAcnJvJ4vnMwN/5qkY= 304 | golang.org/x/exp v0.0.0-20191129062945-2f5052295587/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4= 305 | golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4= 306 | golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4= 307 | golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM= 308 | golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU= 309 | golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js= 310 | golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0= 311 | golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE= 312 | golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU= 313 | golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE= 314 | golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc= 315 | golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc= 316 | golang.org/x/lint 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golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 353 | golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A= 354 | golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A= 355 | golang.org/x/net v0.0.0-20200506145744-7e3656a0809f/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A= 356 | golang.org/x/net v0.0.0-20200513185701-a91f0712d120/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A= 357 | golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A= 358 | golang.org/x/net v0.0.0-20200520182314-0ba52f642ac2/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A= 359 | golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA= 360 | golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod 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387 | golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 388 | golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 389 | golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 390 | golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 391 | golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 392 | golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o= 393 | golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 394 | golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 395 | golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 396 | golang.org/x/sys 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rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= 649 | sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 h1:iXTIw73aPyC+oRdyqqvVJuloN1p0AC/kzH07hu3NE+k= 650 | sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0= 651 | sigs.k8s.io/kustomize/api v0.12.1 h1:7YM7gW3kYBwtKvoY216ZzY+8hM+lV53LUayghNRJ0vM= 652 | sigs.k8s.io/kustomize/api v0.12.1/go.mod h1:y3JUhimkZkR6sbLNwfJHxvo1TCLwuwm14sCYnkH6S1s= 653 | sigs.k8s.io/kustomize/kyaml v0.13.9 h1:Qz53EAaFFANyNgyOEJbT/yoIHygK40/ZcvU3rgry2Tk= 654 | sigs.k8s.io/kustomize/kyaml v0.13.9/go.mod h1:QsRbD0/KcU+wdk0/L0fIp2KLnohkVzs6fQ85/nOXac4= 655 | sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw= 656 | sigs.k8s.io/structured-merge-diff/v4 v4.2.3 h1:PRbqxJClWWYMNV1dhaG4NsibJbArud9kFxnAMREiWFE= 657 | sigs.k8s.io/structured-merge-diff/v4 v4.2.3/go.mod h1:qjx8mGObPmV2aSZepjQjbmb2ihdVs8cGKBraizNC69E= 658 | sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= 659 | sigs.k8s.io/yaml v1.3.0 h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo= 660 | sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8= 661 | -------------------------------------------------------------------------------- /pkg/cmd/cmd.go: -------------------------------------------------------------------------------- 1 | // Package cmd provides command line interface. 2 | package cmd 3 | 4 | import ( 5 | "context" 6 | "errors" 7 | "flag" 8 | "fmt" 9 | "net" 10 | "strconv" 11 | "strings" 12 | 13 | "github.com/google/wire" 14 | "github.com/int128/kubectl-external-forward/pkg/externalforwarder" 15 | "github.com/int128/kubectl-external-forward/pkg/tunnel" 16 | "github.com/spf13/cobra" 17 | "github.com/spf13/pflag" 18 | "k8s.io/cli-runtime/pkg/genericclioptions" 19 | "k8s.io/klog/v2" 20 | ) 21 | 22 | const ( 23 | defaultImage = "ghcr.io/int128/kubectl-external-forward/mirror/envoy" 24 | ) 25 | 26 | var Set = wire.NewSet( 27 | wire.Struct(new(Cmd), "*"), 28 | wire.Bind(new(Interface), new(*Cmd)), 29 | ) 30 | 31 | type Interface interface { 32 | Run(ctx context.Context, osArgs []string, version string) int 33 | } 34 | 35 | // Cmd provides command line interface. 36 | type Cmd struct { 37 | ExternalForwarder externalforwarder.Interface 38 | } 39 | 40 | // Run parses the arguments and executes the corresponding use-case. 41 | func (cmd Cmd) Run(ctx context.Context, osArgs []string, version string) int { 42 | rootCmd := cmd.newRootCmd() 43 | rootCmd.SilenceErrors = true 44 | rootCmd.SilenceUsage = true 45 | rootCmd.Version = version 46 | 47 | rootCmd.SetArgs(osArgs[1:]) 48 | if err := rootCmd.ExecuteContext(ctx); err != nil { 49 | if errors.Is(err, context.Canceled) { 50 | klog.V(1).Infof("terminating: %s", err) 51 | return 0 52 | } 53 | klog.Infof("error: %s", err) 54 | klog.V(1).Infof("stacktrace: %+v", err) 55 | return 1 56 | } 57 | return 0 58 | } 59 | 60 | type rootCmdOptions struct { 61 | k8sOptions *genericclioptions.ConfigFlags 62 | localPort int 63 | remoteHostPort string 64 | image string 65 | } 66 | 67 | func (o *rootCmdOptions) addFlags(f *pflag.FlagSet) { 68 | o.k8sOptions.AddFlags(f) 69 | } 70 | 71 | func (cmd Cmd) newRootCmd() *cobra.Command { 72 | var o rootCmdOptions 73 | o.k8sOptions = genericclioptions.NewConfigFlags(false) 74 | c := &cobra.Command{ 75 | Use: "kubectl external-forward [flags] [LOCAL_HOST:]LOCAL_PORT:REMOTE_HOST:REMOTE_PORT...", 76 | Short: "TODO", 77 | Example: `kubectl external-forward 10000:db.staging:5432`, 78 | RunE: func(c *cobra.Command, args []string) error { 79 | return cmd.runRootCmd(c.Context(), o, args) 80 | }, 81 | } 82 | o.addFlags(c.Flags()) 83 | c.Flags().IntVarP(&o.localPort, "local-port", "l", 0, "local port") 84 | c.Flags().StringVarP(&o.remoteHostPort, "remote-host", "r", "", "remote host:port") 85 | c.Flags().StringVarP(&o.image, "image", "", defaultImage, "Pod image") 86 | 87 | gf := flag.NewFlagSet("", flag.ContinueOnError) 88 | klog.InitFlags(gf) 89 | c.PersistentFlags().AddGoFlagSet(gf) 90 | return c 91 | } 92 | 93 | func (cmd Cmd) runRootCmd(ctx context.Context, o rootCmdOptions, args []string) error { 94 | tunnels, err := parseTunnelArgs(args) 95 | if err != nil { 96 | return fmt.Errorf("invalid arguments: %w", err) 97 | } 98 | restConfig, err := o.k8sOptions.ToRESTConfig() 99 | if err != nil { 100 | return fmt.Errorf("could not load the config: %w", err) 101 | } 102 | namespace, _, err := o.k8sOptions.ToRawKubeConfigLoader().Namespace() 103 | if err != nil { 104 | return fmt.Errorf("could not determine the namespace: %w", err) 105 | } 106 | return cmd.ExternalForwarder.Do(ctx, externalforwarder.Option{ 107 | Config: restConfig, 108 | Tunnels: tunnels, 109 | Namespace: namespace, 110 | PodImage: o.image, 111 | }) 112 | } 113 | 114 | func parseTunnelArgs(args []string) ([]tunnel.Tunnel, error) { 115 | if len(args) < 1 { 116 | return nil, fmt.Errorf("you need to specify one or more arguments") 117 | } 118 | var tunnels []tunnel.Tunnel 119 | for _, arg := range args { 120 | s := strings.Split(arg, ":") 121 | lh := "127.0.0.1" 122 | if len(s) > 4 || len(s) < 3 { 123 | return nil, fmt.Errorf("invalid argument %s", arg) 124 | } 125 | if len(s) == 4 { 126 | if net.ParseIP(s[0]) == nil { 127 | return nil, fmt.Errorf("invalid local host: %s", s[0]) 128 | } 129 | lh = s[0] 130 | s = s[1:] 131 | } 132 | l, err := strconv.Atoi(s[0]) 133 | if err != nil { 134 | return nil, fmt.Errorf("invalid local port: %w", err) 135 | } 136 | r, err := strconv.Atoi(s[2]) 137 | if err != nil { 138 | return nil, fmt.Errorf("invalid local port: %w", err) 139 | } 140 | tunnels = append(tunnels, tunnel.Tunnel{ 141 | LocalHost: lh, 142 | LocalPort: l, 143 | RemoteHost: s[1], 144 | RemotePort: r, 145 | }) 146 | } 147 | return tunnels, nil 148 | } 149 | -------------------------------------------------------------------------------- /pkg/di/di.go: -------------------------------------------------------------------------------- 1 | //+build wireinject 2 | 3 | // Package di provides dependency injection. 4 | package di 5 | 6 | //go:generate wire 7 | 8 | import ( 9 | "github.com/google/wire" 10 | "github.com/int128/kubectl-external-forward/pkg/cmd" 11 | "github.com/int128/kubectl-external-forward/pkg/externalforwarder" 12 | "github.com/int128/kubectl-external-forward/pkg/portforwarder" 13 | ) 14 | 15 | func NewCmd() cmd.Interface { 16 | wire.Build( 17 | cmd.Set, 18 | portforwarder.Set, 19 | externalforwarder.Set, 20 | ) 21 | return nil 22 | } 23 | -------------------------------------------------------------------------------- /pkg/di/wire_gen.go: -------------------------------------------------------------------------------- 1 | // Code generated by Wire. DO NOT EDIT. 2 | 3 | //go:generate wire 4 | //+build !wireinject 5 | 6 | package di 7 | 8 | import ( 9 | "github.com/int128/kubectl-external-forward/pkg/cmd" 10 | "github.com/int128/kubectl-external-forward/pkg/externalforwarder" 11 | "github.com/int128/kubectl-external-forward/pkg/portforwarder" 12 | ) 13 | 14 | // Injectors from di.go: 15 | 16 | func NewCmd() cmd.Interface { 17 | portForwarder := &portforwarder.PortForwarder{} 18 | externalForwarder := &externalforwarder.ExternalForwarder{ 19 | PortForwarder: portForwarder, 20 | } 21 | cmdCmd := &cmd.Cmd{ 22 | ExternalForwarder: externalForwarder, 23 | } 24 | return cmdCmd 25 | } 26 | -------------------------------------------------------------------------------- /pkg/envoy/config.go: -------------------------------------------------------------------------------- 1 | package envoy 2 | 3 | import ( 4 | "embed" 5 | _ "embed" 6 | "fmt" 7 | "strings" 8 | "text/template" 9 | 10 | "github.com/int128/kubectl-external-forward/pkg/tunnel" 11 | ) 12 | 13 | //go:embed template/* 14 | var configTemplateDir embed.FS 15 | 16 | var configTemplate = template.Must(template.ParseFS(configTemplateDir, "template/*")) 17 | 18 | type configTemplateContext struct { 19 | Tunnels []tunnel.Tunnel 20 | } 21 | 22 | func NewConfig(tunnels []tunnel.Tunnel) (string, error) { 23 | c := configTemplateContext{Tunnels: tunnels} 24 | var s strings.Builder 25 | if err := configTemplate.ExecuteTemplate(&s, "envoy.yaml", c); err != nil { 26 | return "", fmt.Errorf("template error: %w", err) 27 | } 28 | return s.String(), nil 29 | } 30 | -------------------------------------------------------------------------------- /pkg/envoy/config_test.go: -------------------------------------------------------------------------------- 1 | package envoy 2 | 3 | import ( 4 | "testing" 5 | 6 | "github.com/google/go-cmp/cmp" 7 | "github.com/int128/kubectl-external-forward/pkg/tunnel" 8 | ) 9 | 10 | func TestNewConfig(t *testing.T) { 11 | t.Run("Tunnel1", func(t *testing.T) { 12 | tunnels := []tunnel.Tunnel{ 13 | { 14 | LocalHost: "0.0.0.0", 15 | LocalPort: 10080, 16 | RemoteHost: "www.example.com", 17 | RemotePort: 80, 18 | }, 19 | } 20 | want := `--- 21 | static_resources: 22 | listeners: 23 | - name: listener_0 24 | address: 25 | socket_address: 26 | address: 0.0.0.0 27 | port_value: 10080 28 | filter_chains: 29 | - filters: 30 | - name: envoy.filters.network.tcp_proxy 31 | typed_config: 32 | "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy 33 | stat_prefix: destination 34 | cluster: cluster_0 35 | clusters: 36 | - name: cluster_0 37 | connect_timeout: 30s 38 | type: LOGICAL_DNS 39 | dns_lookup_family: V4_ONLY 40 | load_assignment: 41 | cluster_name: cluster_0 42 | endpoints: 43 | - lb_endpoints: 44 | - endpoint: 45 | address: 46 | socket_address: 47 | address: www.example.com 48 | port_value: 80 49 | ` 50 | got, err := NewConfig(tunnels) 51 | if err != nil { 52 | t.Fatalf("error NewConfig: %s", err) 53 | } 54 | if got != want { 55 | t.Errorf("got != want:\n%s", cmp.Diff(got, want)) 56 | } 57 | }) 58 | 59 | t.Run("Tunnel2", func(t *testing.T) { 60 | tunnels := []tunnel.Tunnel{ 61 | { 62 | LocalHost: "0.0.0.0", 63 | LocalPort: 10080, 64 | RemoteHost: "www.example.com", 65 | RemotePort: 80, 66 | }, 67 | { 68 | LocalHost: "127.0.0.1", 69 | LocalPort: 15432, 70 | RemoteHost: "db.staging", 71 | RemotePort: 5432, 72 | }, 73 | } 74 | want := `--- 75 | static_resources: 76 | listeners: 77 | - name: listener_0 78 | address: 79 | socket_address: 80 | address: 0.0.0.0 81 | port_value: 10080 82 | filter_chains: 83 | - filters: 84 | - name: envoy.filters.network.tcp_proxy 85 | typed_config: 86 | "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy 87 | stat_prefix: destination 88 | cluster: cluster_0 89 | - name: listener_1 90 | address: 91 | socket_address: 92 | address: 0.0.0.0 93 | port_value: 15432 94 | filter_chains: 95 | - filters: 96 | - name: envoy.filters.network.tcp_proxy 97 | typed_config: 98 | "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy 99 | stat_prefix: destination 100 | cluster: cluster_1 101 | clusters: 102 | - name: cluster_0 103 | connect_timeout: 30s 104 | type: LOGICAL_DNS 105 | dns_lookup_family: V4_ONLY 106 | load_assignment: 107 | cluster_name: cluster_0 108 | endpoints: 109 | - lb_endpoints: 110 | - endpoint: 111 | address: 112 | socket_address: 113 | address: www.example.com 114 | port_value: 80 115 | - name: cluster_1 116 | connect_timeout: 30s 117 | type: LOGICAL_DNS 118 | dns_lookup_family: V4_ONLY 119 | load_assignment: 120 | cluster_name: cluster_1 121 | endpoints: 122 | - lb_endpoints: 123 | - endpoint: 124 | address: 125 | socket_address: 126 | address: db.staging 127 | port_value: 5432 128 | ` 129 | got, err := NewConfig(tunnels) 130 | if err != nil { 131 | t.Fatalf("error NewConfig: %s", err) 132 | } 133 | if got != want { 134 | t.Errorf("got != want:\n%s", cmp.Diff(got, want)) 135 | } 136 | }) 137 | } 138 | -------------------------------------------------------------------------------- /pkg/envoy/template/envoy.yaml: -------------------------------------------------------------------------------- 1 | --- 2 | static_resources: 3 | listeners: 4 | {{- range $index, $tunnel := .Tunnels}} 5 | - name: listener_{{$index}} 6 | address: 7 | socket_address: 8 | address: 0.0.0.0 9 | port_value: {{$tunnel.LocalPort}} 10 | filter_chains: 11 | - filters: 12 | - name: envoy.filters.network.tcp_proxy 13 | typed_config: 14 | "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy 15 | stat_prefix: destination 16 | cluster: cluster_{{$index}} 17 | {{- end}} 18 | clusters: 19 | {{- range $index, $tunnel := .Tunnels}} 20 | - name: cluster_{{$index}} 21 | connect_timeout: 30s 22 | type: LOGICAL_DNS 23 | dns_lookup_family: V4_ONLY 24 | load_assignment: 25 | cluster_name: cluster_{{$index}} 26 | endpoints: 27 | - lb_endpoints: 28 | - endpoint: 29 | address: 30 | socket_address: 31 | address: {{$tunnel.RemoteHost}} 32 | port_value: {{$tunnel.RemotePort}} 33 | {{- end}} 34 | -------------------------------------------------------------------------------- /pkg/externalforwarder/external_forwarder.go: -------------------------------------------------------------------------------- 1 | package externalforwarder 2 | 3 | import ( 4 | "context" 5 | "fmt" 6 | "os" 7 | "os/signal" 8 | "time" 9 | 10 | "github.com/google/wire" 11 | "github.com/int128/kubectl-external-forward/pkg/portforwarder" 12 | "github.com/int128/kubectl-external-forward/pkg/tunnel" 13 | "golang.org/x/sync/errgroup" 14 | corev1 "k8s.io/api/core/v1" 15 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 16 | "k8s.io/client-go/kubernetes" 17 | _ "k8s.io/client-go/plugin/pkg/client/auth/oidc" 18 | "k8s.io/client-go/rest" 19 | "k8s.io/klog/v2" 20 | ) 21 | 22 | var Set = wire.NewSet( 23 | wire.Struct(new(ExternalForwarder), "*"), 24 | wire.Bind(new(Interface), new(*ExternalForwarder)), 25 | ) 26 | 27 | type Option struct { 28 | Config *rest.Config 29 | Tunnels []tunnel.Tunnel 30 | Namespace string 31 | PodImage string 32 | } 33 | 34 | type Interface interface { 35 | Do(ctx context.Context, o Option) error 36 | } 37 | 38 | type ExternalForwarder struct { 39 | PortForwarder portforwarder.Interface 40 | } 41 | 42 | func (f ExternalForwarder) Do(ctx context.Context, o Option) error { 43 | clientset, err := kubernetes.NewForConfig(o.Config) 44 | if err != nil { 45 | return fmt.Errorf("could not create a client set: %w", err) 46 | } 47 | 48 | klog.Infof("creating a pod") 49 | pod, err := newPod(o) 50 | if err != nil { 51 | return fmt.Errorf("could not generate pod spec: %w", err) 52 | } 53 | pod, err = clientset.CoreV1().Pods(o.Namespace).Create(ctx, pod, metav1.CreateOptions{}) 54 | if err != nil { 55 | return fmt.Errorf("could not create pod: %w", err) 56 | } 57 | klog.Infof("created pod %s/%s", pod.Namespace, pod.Name) 58 | 59 | ctx, stop := signal.NotifyContext(ctx, os.Interrupt) 60 | defer stop() 61 | var eg errgroup.Group 62 | eg.Go(func() error { 63 | <-ctx.Done() 64 | 65 | // clean up the pod 66 | ctx := context.Background() 67 | ctx, stop := signal.NotifyContext(ctx, os.Interrupt) 68 | defer stop() 69 | klog.Infof("deleting pod %s/%s...", pod.Namespace, pod.Name) 70 | if err := deletePodWithRetry(ctx, clientset, pod.Namespace, pod.Name, 60*time.Second); err != nil { 71 | return fmt.Errorf("you need to delete pod %s/%s manually: %w", pod.Namespace, pod.Name, err) 72 | } 73 | klog.Infof("deleted pod %s/%s", pod.Namespace, pod.Name) 74 | return nil 75 | }) 76 | 77 | eg.Go(func() error { 78 | if err := waitForPodRunning(ctx, clientset, pod.Namespace, pod.Name, 60*time.Second); err != nil { 79 | return fmt.Errorf("pod is not running: %w", err) 80 | } 81 | 82 | for _, container := range pod.Spec.Containers { 83 | containerName := container.Name 84 | eg.Go(func() error { 85 | return tailPodLogs(ctx, clientset, pod.Namespace, pod.Name, containerName) 86 | }) 87 | } 88 | 89 | for _, t := range o.Tunnels { 90 | f.startPortForwarder(ctx, &eg, o.Config, t, pod) 91 | } 92 | return nil 93 | }) 94 | return eg.Wait() 95 | } 96 | 97 | func (f ExternalForwarder) startPortForwarder(ctx context.Context, eg *errgroup.Group, restConfig *rest.Config, tunnel tunnel.Tunnel, pod *corev1.Pod) { 98 | stopChan := make(chan struct{}) 99 | eg.Go(func() error { 100 | <-ctx.Done() 101 | close(stopChan) 102 | return nil 103 | }) 104 | eg.Go(func() error { 105 | klog.Infof("starting port-forwarder from %d to %s/%s:%d", tunnel.LocalPort, pod.Namespace, pod.Name, tunnel.LocalPort) 106 | po := portforwarder.Option{ 107 | Config: restConfig, 108 | SourceHost: tunnel.LocalHost, 109 | SourcePort: tunnel.LocalPort, 110 | TargetNamespace: pod.Namespace, 111 | TargetPodName: pod.Name, 112 | TargetContainerPort: tunnel.LocalPort, 113 | } 114 | if err := f.PortForwarder.Run(po, nil, stopChan); err != nil { 115 | return fmt.Errorf("could not start port-forwarder") 116 | } 117 | klog.Info("stopped port-forwarder") 118 | return nil 119 | }) 120 | } 121 | -------------------------------------------------------------------------------- /pkg/externalforwarder/pod.go: -------------------------------------------------------------------------------- 1 | package externalforwarder 2 | 3 | import ( 4 | "bufio" 5 | "context" 6 | "fmt" 7 | "io" 8 | "time" 9 | 10 | "github.com/cenkalti/backoff/v4" 11 | "github.com/int128/kubectl-external-forward/pkg/envoy" 12 | corev1 "k8s.io/api/core/v1" 13 | "k8s.io/apimachinery/pkg/api/resource" 14 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 15 | "k8s.io/client-go/kubernetes" 16 | "k8s.io/klog/v2" 17 | ) 18 | 19 | func newPod(o Option) (*corev1.Pod, error) { 20 | pod := corev1.Pod{ 21 | ObjectMeta: metav1.ObjectMeta{ 22 | GenerateName: "kubectl-external-forward-", 23 | Annotations: map[string]string{ 24 | // do not prevent scale-in of cluster autoscaler 25 | "cluster-autoscaler.kubernetes.io/safe-to-evict": "true", 26 | "sidecar.istio.io/inject": "false", 27 | }, 28 | }, 29 | Spec: corev1.PodSpec{}, 30 | } 31 | 32 | envoyConfig, err := envoy.NewConfig(o.Tunnels) 33 | if err != nil { 34 | return nil, fmt.Errorf("could not generate envoy config: %w", err) 35 | } 36 | 37 | pod.Spec.Containers = []corev1.Container{ 38 | { 39 | Name: "envoy", 40 | Image: o.PodImage, 41 | Args: []string{ 42 | "--config-yaml", 43 | envoyConfig, 44 | }, 45 | Resources: corev1.ResourceRequirements{ 46 | Requests: corev1.ResourceList{ 47 | corev1.ResourceCPU: resource.MustParse("10m"), 48 | corev1.ResourceMemory: resource.MustParse("10Mi"), 49 | }, 50 | }, 51 | }, 52 | } 53 | return &pod, nil 54 | } 55 | 56 | func waitForPodRunning(ctx context.Context, c *kubernetes.Clientset, namespace, name string, timeout time.Duration) error { 57 | checkIfRunning := func() error { 58 | pod, err := c.CoreV1().Pods(namespace).Get(ctx, name, metav1.GetOptions{}) 59 | if err != nil { 60 | return backoff.Permanent(err) 61 | } 62 | if pod.Status.Phase != corev1.PodRunning { 63 | return fmt.Errorf("pod %s/%s is still %s", pod.Namespace, pod.Name, pod.Status.Phase) 64 | } 65 | return nil 66 | } 67 | notify := func(err error, d time.Duration) { 68 | klog.Info(err) 69 | } 70 | 71 | b := backoff.NewExponentialBackOff() 72 | b.MaxElapsedTime = timeout 73 | b.MaxInterval = 3 * time.Second 74 | if err := backoff.RetryNotify(checkIfRunning, backoff.WithContext(b, ctx), notify); err != nil { 75 | return err 76 | } 77 | return nil 78 | } 79 | 80 | func tailPodLogs(ctx context.Context, c *kubernetes.Clientset, namespace, name, containerName string) error { 81 | opts := corev1.PodLogOptions{ 82 | Follow: true, 83 | Container: containerName, 84 | } 85 | stream, err := c.CoreV1().Pods(namespace).GetLogs(name, &opts).Stream(ctx) 86 | if err != nil { 87 | return fmt.Errorf("could not get logs from pod: %w", err) 88 | } 89 | defer stream.Close() 90 | for { 91 | r := bufio.NewReader(stream) 92 | l, _, err := r.ReadLine() 93 | if err != nil { 94 | if err == io.EOF { 95 | return nil 96 | } 97 | return fmt.Errorf("read error: %w", err) 98 | } 99 | klog.Infof("%s/%s/%s: %s", namespace, name, containerName, l) 100 | } 101 | } 102 | 103 | func deletePodWithRetry(ctx context.Context, c *kubernetes.Clientset, namespace, name string, timeout time.Duration) error { 104 | attempt := func() error { 105 | err := c.CoreV1().Pods(namespace).Delete(ctx, name, *metav1.NewDeleteOptions(0)) 106 | if err != nil { 107 | return fmt.Errorf("could not delete pod: %w", err) 108 | } 109 | return nil 110 | } 111 | notify := func(err error, d time.Duration) { 112 | klog.Info(err) 113 | } 114 | 115 | b := backoff.NewExponentialBackOff() 116 | b.MaxElapsedTime = timeout 117 | b.MaxInterval = 3 * time.Second 118 | if err := backoff.RetryNotify(attempt, backoff.WithContext(b, ctx), notify); err != nil { 119 | return err 120 | } 121 | return nil 122 | } 123 | -------------------------------------------------------------------------------- /pkg/portforwarder/mock_portforwarder/mock_portforwarder.go: -------------------------------------------------------------------------------- 1 | // Code generated by MockGen. DO NOT EDIT. 2 | // Source: github.com/int128/kubectl-external-forward/pkg/portforwarder (interfaces: Interface) 3 | 4 | // Package mock_portforwarder is a generated GoMock package. 5 | package mock_portforwarder 6 | 7 | import ( 8 | gomock "github.com/golang/mock/gomock" 9 | portforwarder "github.com/int128/kubectl-external-forward/pkg/portforwarder" 10 | reflect "reflect" 11 | ) 12 | 13 | // MockInterface is a mock of Interface interface 14 | type MockInterface struct { 15 | ctrl *gomock.Controller 16 | recorder *MockInterfaceMockRecorder 17 | } 18 | 19 | // MockInterfaceMockRecorder is the mock recorder for MockInterface 20 | type MockInterfaceMockRecorder struct { 21 | mock *MockInterface 22 | } 23 | 24 | // NewMockInterface creates a new mock instance 25 | func NewMockInterface(ctrl *gomock.Controller) *MockInterface { 26 | mock := &MockInterface{ctrl: ctrl} 27 | mock.recorder = &MockInterfaceMockRecorder{mock} 28 | return mock 29 | } 30 | 31 | // EXPECT returns an object that allows the caller to indicate expected use 32 | func (m *MockInterface) EXPECT() *MockInterfaceMockRecorder { 33 | return m.recorder 34 | } 35 | 36 | // Run mocks base method 37 | func (m *MockInterface) Run(arg0 portforwarder.Option, arg1 chan struct{}, arg2 <-chan struct{}) error { 38 | m.ctrl.T.Helper() 39 | ret := m.ctrl.Call(m, "Run", arg0, arg1, arg2) 40 | ret0, _ := ret[0].(error) 41 | return ret0 42 | } 43 | 44 | // Run indicates an expected call of Run 45 | func (mr *MockInterfaceMockRecorder) Run(arg0, arg1, arg2 interface{}) *gomock.Call { 46 | mr.mock.ctrl.T.Helper() 47 | return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Run", reflect.TypeOf((*MockInterface)(nil).Run), arg0, arg1, arg2) 48 | } 49 | -------------------------------------------------------------------------------- /pkg/portforwarder/port_forwarder.go: -------------------------------------------------------------------------------- 1 | // Package portforwarder provides port forwarding between local and Kubernetes. 2 | package portforwarder 3 | 4 | import ( 5 | "fmt" 6 | "net/http" 7 | "net/url" 8 | "os" 9 | 10 | "github.com/google/wire" 11 | "k8s.io/client-go/rest" 12 | "k8s.io/client-go/tools/portforward" 13 | "k8s.io/client-go/transport/spdy" 14 | ) 15 | 16 | var Set = wire.NewSet( 17 | wire.Struct(new(PortForwarder), "*"), 18 | wire.Bind(new(Interface), new(*PortForwarder)), 19 | ) 20 | 21 | //go:generate mockgen -destination mock_portforwarder/mock_portforwarder.go github.com/int128/kubectl-external-forward/pkg/portforwarder Interface 22 | 23 | // Option represents an option of PortForwarder. 24 | type Option struct { 25 | Config *rest.Config 26 | SourceHost string 27 | SourcePort int 28 | TargetNamespace string 29 | TargetPodName string 30 | TargetContainerPort int 31 | } 32 | 33 | type Interface interface { 34 | Run(o Option, readyChan chan struct{}, stopChan <-chan struct{}) error 35 | } 36 | 37 | type PortForwarder struct { 38 | } 39 | 40 | // Run executes a port forwarder. 41 | // 42 | // It returns nil if stopChan has been closed or connection has lost. 43 | // It returns an error if it could not connect to the pod. 44 | // 45 | // It will close the readyChan when the port forwarder is ready. 46 | // Caller can stop the port forwarder by closing the stopChan. 47 | func (pf *PortForwarder) Run(o Option, readyChan chan struct{}, stopChan <-chan struct{}) error { 48 | pfURL, err := url.Parse(fmt.Sprintf("%s/api/v1/namespaces/%s/pods/%s/portforward", o.Config.Host, o.TargetNamespace, o.TargetPodName)) 49 | if err != nil { 50 | return fmt.Errorf("could not build URL for portforward: %w", err) 51 | } 52 | rt, upgrader, err := spdy.RoundTripperFor(o.Config) 53 | if err != nil { 54 | return fmt.Errorf("could not create a round tripper: %w", err) 55 | } 56 | dialer := spdy.NewDialer(upgrader, &http.Client{Transport: rt}, http.MethodPost, pfURL) 57 | portPair := fmt.Sprintf("%d:%d", o.SourcePort, o.TargetContainerPort) 58 | forwarder, err := portforward.NewOnAddresses(dialer, []string{o.SourceHost}, []string{portPair}, stopChan, readyChan, os.Stdout, os.Stderr) 59 | if err != nil { 60 | return fmt.Errorf("could not create a port forwarder: %w", err) 61 | } 62 | if err := forwarder.ForwardPorts(); err != nil { 63 | return fmt.Errorf("could not run the port forwarder at %s: %w", portPair, err) 64 | } 65 | return nil 66 | } 67 | -------------------------------------------------------------------------------- /pkg/tunnel/tunnel.go: -------------------------------------------------------------------------------- 1 | package tunnel 2 | 3 | type Tunnel struct { 4 | LocalHost string 5 | LocalPort int 6 | RemoteHost string 7 | RemotePort int 8 | } 9 | --------------------------------------------------------------------------------