/
main.go
476 lines (403 loc) · 12 KB
/
main.go
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package main
import (
"context"
"flag"
"fmt"
html_template "html/template"
"io"
"log"
"net/http"
"os"
"os/signal"
"sort"
"strings"
"sync"
"syscall"
"time"
_ "embed"
"github.com/anupcshan/tscloudvpn/cmd/tscloudvpn/assets"
"github.com/anupcshan/tscloudvpn/internal/providers"
_ "github.com/anupcshan/tscloudvpn/internal/providers/ec2"
_ "github.com/anupcshan/tscloudvpn/internal/providers/gcp"
_ "github.com/anupcshan/tscloudvpn/internal/providers/vultr"
"github.com/anupcshan/tscloudvpn/internal/utils"
"github.com/bradenaw/juniper/xmaps"
"github.com/bradenaw/juniper/xslices"
"github.com/felixge/httpsnoop"
"github.com/hako/durafmt"
"golang.org/x/sync/errgroup"
"github.com/tailscale/tailscale-client-go/tailscale"
"tailscale.com/ipn/ipnstate"
"tailscale.com/tailcfg"
"tailscale.com/tsnet"
)
var (
templates = html_template.Must(html_template.New("root").ParseFS(assets.Assets, "*.tmpl"))
)
const (
// Time from issuing CreateInstance to when the instance should be available on GetInstanceStatus.
// This is needed to work around providers that have eventually consistent APIs (like Vultr).
instanceLaunchDetectTimeout = time.Minute
)
func createInstance(ctx context.Context, logger *log.Logger, tsClient *tailscale.Client, provider providers.Provider, region string) error {
capabilities := tailscale.KeyCapabilities{}
capabilities.Devices.Create.Tags = []string{"tag:untrusted"}
capabilities.Devices.Create.Ephemeral = true
capabilities.Devices.Create.Reusable = false
capabilities.Devices.Create.Preauthorized = true
key, err := tsClient.CreateKey(ctx, capabilities)
if err != nil {
return err
}
launchTime := time.Now()
hostname, err := provider.CreateInstance(ctx, region, key)
if err != nil {
return err
}
logger.Printf("Launched instance %s", hostname)
logger.Printf("Waiting for instance to be listed via provider API")
startTime := time.Now()
for {
if time.Since(startTime) > instanceLaunchDetectTimeout {
return fmt.Errorf("Instance %s failed to be available in provider API in %s", hostname, instanceLaunchDetectTimeout)
}
status, err := provider.GetInstanceStatus(ctx, region)
if err != nil {
return err
}
if status != providers.InstanceStatusRunning {
time.Sleep(time.Second)
continue
}
break
}
logger.Printf("Instance available in provider API")
logger.Printf("Waiting for instance to register on Tailscale")
for {
time.Sleep(time.Second)
status, err := provider.GetInstanceStatus(ctx, region)
if err != nil {
return err
}
if status != providers.InstanceStatusRunning {
logger.Printf("Instance %s failed to launch", hostname)
return fmt.Errorf("Instance no longer running")
}
devices, err := tsClient.Devices(ctx)
if err != nil {
return err
}
var deviceId string
var nodeName string
for _, device := range devices {
if device.Hostname == hostname && launchTime.Before(device.Created.Time) {
deviceId = device.ID
nodeName = strings.SplitN(device.Name, ".", 2)[0]
logger.Printf("Instance registered on Tailscale with ID %s, name %s", deviceId, nodeName)
break
}
}
if deviceId == "" {
continue
}
routes, err := tsClient.DeviceSubnetRoutes(ctx, deviceId)
if err != nil {
return err
}
logger.Printf("Approving exit node %s", nodeName)
if err := tsClient.SetDeviceSubnetRoutes(ctx, deviceId, routes.Advertised); err != nil {
return err
}
break
}
return nil
}
type flushWriter struct {
w io.Writer
}
func (f flushWriter) Write(b []byte) (int, error) {
n, err := f.w.Write(b)
if flusher, ok := f.w.(http.Flusher); ok {
flusher.Flush()
}
return n, err
}
type statusInfo[T any] struct {
ProviderCount int
RegionCount int
ActiveNodes int
Detail T
}
func wrapWithStatusInfo[T any](t T, cloudProviders map[string]providers.Provider, lazyListRegionsMap map[string]func() []providers.Region, tsStatus *ipnstate.Status) statusInfo[T] {
regionCount := 0
deviceMap := xmaps.Set[string]{}
expectedHostnameMap := xmaps.Set[string]{}
for _, peer := range tsStatus.Peer {
deviceMap.Add(peer.HostName)
}
for providerName, f := range lazyListRegionsMap {
for _, region := range f() {
regionCount++
expectedHostnameMap.Add(cloudProviders[providerName].Hostname(region.Code))
}
}
return statusInfo[T]{
ProviderCount: len(cloudProviders),
RegionCount: regionCount,
ActiveNodes: len(xmaps.Intersection(deviceMap, expectedHostnameMap)),
Detail: t,
}
}
func Main() error {
log.SetFlags(log.Lshortfile | log.Lmicroseconds)
ctx, cancelFunc := context.WithCancel(context.Background())
defer cancelFunc()
cloudProviders := make(map[string]providers.Provider)
for key, providerFactory := range providers.ProviderFactoryRegistry {
log.Printf("Processing cloud provider %s", key)
cloudProvider, err := providerFactory(ctx, os.Getenv("SSH_PUBKEY"))
if err != nil {
return err
}
if cloudProvider == nil {
log.Printf("Skipping unconfigured cloud provider %s", key)
continue
}
cloudProviders[key] = cloudProvider
}
oauthClientId := os.Getenv("TAILSCALE_CLIENT_ID")
oauthSecret := os.Getenv("TAILSCALE_CLIENT_SECRET")
tailnet := os.Getenv("TAILSCALE_TAILNET")
tsClient, err := tailscale.NewClient(
"",
tailnet,
tailscale.WithOAuthClientCredentials(
oauthClientId,
oauthSecret,
[]string{"devices", "routes"},
),
)
if err != nil {
return err
}
capabilities := tailscale.KeyCapabilities{}
capabilities.Devices.Create.Tags = []string{"tag:untrusted"}
capabilities.Devices.Create.Ephemeral = true
capabilities.Devices.Create.Reusable = true
capabilities.Devices.Create.Preauthorized = true
key, err := tsClient.CreateKey(ctx, capabilities)
if err != nil {
return err
}
tsnetSrv := &tsnet.Server{
Hostname: "tscloudvpn",
Ephemeral: true,
AuthKey: key.Key,
Logf: func(string, ...any) {}, // Silence logspam from tsnet
}
ln, err := tsnetSrv.Listen("tcp", ":80")
if err != nil {
return err
}
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-sigs
cancelFunc()
}()
defer cancelFunc()
go func() {
<-ctx.Done()
ln.Close()
tsnetSrv.Close()
}()
tsLocalClient, err := tsnetSrv.LocalClient()
if err != nil {
return err
}
lazyListRegionsMap := make(map[string]func() []providers.Region)
for providerName, provider := range cloudProviders {
provider := provider
lazyListRegionsMap[providerName] = utils.LazyWithErrors(
func() ([]providers.Region, error) {
return provider.ListRegions(ctx)
},
)
}
pingMap := make(map[string]time.Time)
var pingMapLock sync.Mutex
go func() {
expectedHostnameMap := xmaps.Set[string]{}
for providerName, f := range lazyListRegionsMap {
for _, region := range f() {
expectedHostnameMap.Add(cloudProviders[providerName].Hostname(region.Code))
}
}
ticker := time.NewTicker(5 * time.Second)
for {
<-ticker.C
func() {
subctx, cancelFunc := context.WithTimeout(ctx, 5*time.Second)
defer cancelFunc()
errG := errgroup.Group{}
tsStatus, err := tsLocalClient.Status(ctx)
if err != nil {
log.Printf("Error getting status: %s", err)
return
}
for _, peer := range tsStatus.Peer {
peer := peer
if !expectedHostnameMap.Contains(peer.HostName) {
continue
}
errG.Go(func() error {
_, err := tsLocalClient.Ping(subctx, peer.TailscaleIPs[0], tailcfg.PingDisco)
if err != nil {
log.Printf("Ping error from %s (%s): %s", peer.HostName, peer.TailscaleIPs[0], err)
} else {
pingMapLock.Lock()
pingMap[peer.HostName] = time.Now()
pingMapLock.Unlock()
}
return nil
})
}
_ = errG.Wait()
}()
}
}()
mux := http.NewServeMux()
mux.Handle("/", http.RedirectHandler("/regions", http.StatusTemporaryRedirect))
mux.HandleFunc("/regions", func(w http.ResponseWriter, r *http.Request) {
type mappedRegion struct {
Provider string
Region string
LongName string
HasNode bool
SinceCreated string
RecentPingSuccess bool
CreatedTS time.Time
}
var mappedRegions []mappedRegion
tsStatus, err := tsLocalClient.Status(ctx)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return
}
for providerName, provider := range cloudProviders {
provider := provider
providerName := providerName
lazyListRegions := lazyListRegionsMap[providerName]
regions := lazyListRegions()
deviceMap := make(map[string]*ipnstate.PeerStatus)
for _, peer := range tsStatus.Peer {
deviceMap[peer.HostName] = peer
}
mappedRegions = append(mappedRegions, xslices.Map(regions, func(region providers.Region) mappedRegion {
node, hasNode := deviceMap[provider.Hostname(region.Code)]
var sinceCreated string
var createdTS time.Time
var recentPingSuccess bool
if hasNode {
createdTS = node.Created
sinceCreated = durafmt.ParseShort(time.Since(node.Created)).InternationalString()
pingMapLock.Lock()
lastPingTimestamp := pingMap[provider.Hostname(region.Code)]
if !lastPingTimestamp.IsZero() {
timeSinceLastPing := time.Since(lastPingTimestamp)
if timeSinceLastPing < 30*time.Second {
recentPingSuccess = true
}
}
pingMapLock.Unlock()
}
return mappedRegion{
Provider: providerName,
Region: region.Code,
LongName: region.LongName,
HasNode: hasNode,
CreatedTS: createdTS,
SinceCreated: sinceCreated,
RecentPingSuccess: recentPingSuccess,
}
})...)
}
sort.Slice(mappedRegions, func(i, j int) bool {
if mappedRegions[i].Provider != mappedRegions[j].Provider {
return mappedRegions[i].Provider < mappedRegions[j].Provider
}
return mappedRegions[i].Region < mappedRegions[j].Region
})
if err := templates.ExecuteTemplate(w, "list_regions.tmpl", wrapWithStatusInfo(mappedRegions, cloudProviders, lazyListRegionsMap, tsStatus)); err != nil {
w.Write([]byte(err.Error()))
}
})
for providerName, provider := range cloudProviders {
provider := provider
providerName := providerName
lazyListRegions := lazyListRegionsMap[providerName]
for _, region := range lazyListRegions() {
region := region
mux.HandleFunc(fmt.Sprintf("/providers/%s/regions/%s", providerName, region.Code), func(w http.ResponseWriter, r *http.Request) {
if r.Method == "POST" {
if r.PostFormValue("action") == "delete" {
ctx := r.Context()
devices, err := tsClient.Devices(ctx)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return
}
filtered := xslices.Filter(devices, func(device tailscale.Device) bool {
return device.Hostname == provider.Hostname(region.Code)
})
if len(filtered) > 0 {
err := tsClient.DeleteDevice(ctx, filtered[0].ID)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return
} else {
fmt.Fprint(w, "ok")
}
}
} else {
logger := log.New(io.MultiWriter(flushWriter{w}, os.Stderr), "", log.Lshortfile|log.Lmicroseconds)
ctx, cancelFunc := context.WithTimeout(context.Background(), 5*time.Minute)
defer cancelFunc()
err := createInstance(ctx, logger, tsClient, provider, region.Code)
if err != nil {
w.Write([]byte(err.Error()))
} else {
w.Write([]byte("ok"))
}
}
return
}
fmt.Fprintf(w, "Method %s not implemented", r.Method)
})
}
}
mux.Handle("/assets/", http.StripPrefix("/assets/", http.FileServer(http.FS(assets.Assets))))
return http.Serve(ln, logRequest(mux))
}
func logRequest(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
m := httpsnoop.CaptureMetrics(handler, w, r)
log.Printf(
"%s %d %s %s %s",
r.RemoteAddr,
m.Code,
r.Method,
r.URL,
m.Duration,
)
})
}
func main() {
flag.Parse()
if err := Main(); err != nil {
log.Fatal(err)
}
}