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main.go
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/
main.go
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package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"sort"
"strings"
"sync"
"syscall"
"time"
"github.com/rs/zerolog"
"gopkg.in/yaml.v3"
corev1 "k8s.io/api/core/v1"
kerr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
const (
defaultWorkersNumber uint = 5
defaultMaxServers uint = 100
defaultServersListURL string = "https://serverlist.piaservers.net/vpninfo/servers/v6"
orderByRegionName string = "region-name"
orderByLatency string = "latency"
defaultOrderBy string = orderByLatency
ascendingOrder string = "asc"
descendingOrder string = "desc"
defaultOrderDirection string = ascendingOrder
defaultVerbosity int = 1
defaultMaxLatency time.Duration = 50 * time.Millisecond
defaultFrequency time.Duration = time.Hour
defaultResultsWriterFreq time.Duration = 5 * time.Minute
defaultConfMapName string = "pia-regions"
namespaceEnv string = "NAMESPACE"
)
type Options struct {
MaxLatency time.Duration
Workers uint
MaxServers uint
ServersListURL string
OrderBy string
OrderDirection string
Verbosity int
Frequency time.Duration
}
func main() {
opts := &Options{}
// -----------------------------------
// Flags
// -----------------------------------
flag.DurationVar(&opts.MaxLatency, "max-latency", defaultMaxLatency,
"Maximum latency tolerated for a server to be kept.")
flag.UintVar(&opts.Workers, "workers", defaultWorkersNumber,
"Number of concurrent workers to use for checking latency.")
flag.UintVar(&opts.MaxServers, "max-servers", defaultMaxServers,
"Maximum number of servers to keep.")
flag.StringVar(&opts.ServersListURL, "servers-list-url", defaultServersListURL,
"The URL where to get the list of servers.")
flag.StringVar(&opts.OrderBy, "order-by", defaultOrderBy,
fmt.Sprintf("How to order the the servers list. Accepted values: %s or %s.", orderByRegionName, orderByLatency))
flag.StringVar(&opts.OrderDirection, "order-direction", defaultOrderDirection,
fmt.Sprintf("The order direction. Accepted values: %s or %s", ascendingOrder, descendingOrder))
flag.IntVar(&opts.Verbosity, "verbosity", defaultVerbosity,
"The log verbosity level, from 0 (verbose) to 3 (silent).")
flag.DurationVar(&opts.Frequency, "frequency", defaultFrequency,
"The frequency of updating the list of servers.")
flag.Parse()
log := zerolog.New(os.Stderr).With().Timestamp().Logger()
log.Info().Msg("starting...")
// -----------------------------------
// Get Kubernetes clientset and data
// -----------------------------------
namespace := os.Getenv(namespaceEnv)
if namespace == "" {
log.Fatal().Msg("could not get namespace from enviroment variables")
return
}
clientset, err := getKubernetesClientset()
if err != nil {
log.Fatal().Err(err).Msg("could not get Kubernetes clientset")
}
// -----------------------------------
// Validations
// -----------------------------------
{
logLevels := []zerolog.Level{
zerolog.DebugLevel,
zerolog.InfoLevel,
zerolog.ErrorLevel,
zerolog.FatalLevel,
}
if opts.Verbosity < 0 || opts.Verbosity > len(logLevels)-1 {
log.Fatal().Err(fmt.Errorf("invalid verbosity level")).Msg("")
}
log = log.Level(logLevels[opts.Verbosity])
}
if opts.MaxLatency == 0 {
log.Fatal().Err(fmt.Errorf("invalid max latency provided")).
Dur("max-latency", opts.MaxLatency).Msg("")
}
if opts.Workers == 0 {
log.Debug().Uint("workers", opts.Workers).
Uint("default-workers-number", defaultWorkersNumber).
Msg("invalid workers flag provided: using default value...")
}
if opts.MaxServers == 0 {
log.Debug().Msg("using no limits for maximum servers to list")
}
if _, err := url.Parse(opts.ServersListURL); err != nil {
log.Fatal().Err(err).Str("servers-list-url", opts.ServersListURL).
Msg("invalid servers list url provided")
}
if !strings.EqualFold(opts.OrderBy, orderByRegionName) &&
!strings.EqualFold(opts.OrderBy, orderByLatency) {
log.Fatal().Err(fmt.Errorf("unknown order type")).
Str("order-by", opts.OrderBy).Msg("")
}
if !strings.EqualFold(opts.OrderDirection, ascendingOrder) &&
!strings.EqualFold(opts.OrderDirection, descendingOrder) {
log.Fatal().Err(fmt.Errorf("unknown order direction")).
Str("order-direction", opts.OrderDirection).
Msg("")
}
// -----------------------------------
// Start workers
// -----------------------------------
ctx, canc := context.WithCancel(context.Background())
// The request chan, containing the server to test.
reqChan := make(chan *ServerLatency, 256)
// The result chan, containing the same structure set to reqChan but with
// the Latency field set.
resChan := make(chan *ServerLatency, 256)
wg := sync.WaitGroup{}
for i := 0; i < int(opts.Workers); i++ {
wg.Add(1)
go func(wid int) {
defer wg.Done()
log.Info().Int("worker", wid+1).Msg("worker starting...")
work(ctx, reqChan, resChan, log, opts.MaxLatency)
log.Info().Int("worker", wid+1).Msg("worker exited")
}(i)
}
// -----------------------------------
// Handle events
// -----------------------------------
stop := make(chan os.Signal, 1)
signal.Notify(stop, os.Interrupt, syscall.SIGTERM, syscall.SIGABRT)
updateTicker := time.NewTicker(opts.Frequency)
confWriterTimer := time.NewTimer(time.Second)
// This will be used to trigger the first iteration
firstTime := time.NewTimer(5 * time.Second)
latResults := []*ServerLatency{}
stopping := false
for !stopping {
select {
case <-updateTicker.C:
case <-firstTime.C:
wg.Add(1)
go func() {
defer wg.Done()
servListCtx, servListCanc := context.WithTimeout(ctx, time.Minute)
defer servListCanc()
log.Debug().Msg("getting list of servers...")
regions, err := getServersList(servListCtx, opts.ServersListURL)
if err != nil {
// TODO: auto-exit if failed too many times in a row
log.Err(err).Msg("could not load regions, skipping...")
return
}
log.Info().Msg("calculating latencies...")
for _, region := range regions {
if region.Servers == nil {
continue
}
// TODO: we're only concentrating on WireGuard for now. So we skip
// this if it doesn't have any.
for _, serv := range region.Servers.WireGuard {
reqChan <- &ServerLatency{
Server: serv,
Region: region,
}
}
}
}()
// After some minutes, this will activate and will write results
// TODO: if user sets a long timeout, this may not be enough and
// may leave out some results.
confWriterTimer = time.NewTimer(time.Minute)
case <-confWriterTimer.C:
wg.Add(1)
go func() {
defer wg.Done()
wrtCtx, wrtCanc := context.WithTimeout(ctx, time.Minute)
defer wrtCanc()
if opts.MaxServers > 0 && len(latResults) > int(opts.MaxServers) {
latResults = latResults[:opts.MaxServers]
}
// Sort the results.
var sortIface sort.Interface
switch opts.OrderBy {
case orderByLatency:
if opts.OrderDirection == ascendingOrder {
sortIface = byLowerLatency(latResults)
} else {
sortIface = byGreaterLatency(latResults)
}
case orderByRegionName:
if opts.OrderDirection == ascendingOrder {
sortIface = byLowerRegionName(latResults)
} else {
sortIface = byGreaterRegionName(latResults)
}
}
sort.Sort(sortIface)
if err := updateConfigMap(wrtCtx, clientset, namespace, latResults); err != nil {
// TODO: keep track of the number of times this failed, and
// close if it failed too many times.
log.Err(err).Msg("could not update configmap, skipping...")
}
}()
case lat := <-resChan:
if lat != nil && len(lat.Servers.WireGuard) > 0 {
latResults = append(latResults, lat)
}
case <-stop:
stopping = true
updateTicker.Stop()
confWriterTimer.Stop()
fmt.Println()
}
}
close(resChan)
close(reqChan)
canc()
log.Info().Msg("shutting down...")
log.Info().Msg("waiting for all goroutines to exit...")
wg.Wait()
log.Info().Msg("goodbye!")
}
func getKubernetesClientset() (*kubernetes.Clientset, error) {
config, err := rest.InClusterConfig()
if err != nil {
return nil, fmt.Errorf("could not get configuration from cluster: %w", err)
}
return kubernetes.NewForConfig(config)
}
func getServersList(ctx context.Context, serversListURL string) ([]*Region, error) {
client := http.Client{}
req, err := http.NewRequestWithContext(ctx, http.MethodGet, serversListURL, nil)
if err != nil {
return nil, err
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
var listResp ServersListResponse
if err := json.NewDecoder(resp.Body).Decode(&listResp); err != nil {
return nil, err
}
return listResp.Regions, nil
}
func work(ctx context.Context, reqChan, resChan chan *ServerLatency, log zerolog.Logger, maxLatency time.Duration) {
for reg := range reqChan {
ip := fmt.Sprintf("%s:443", reg.IP)
l := log.With().Str("cn", reg.CN).Str("ip", reg.IP).
Logger()
now := time.Now()
conn, err := net.DialTimeout("tcp", ip, maxLatency)
if err != nil {
if err, ok := err.(net.Error); ok && err.Timeout() {
l.Debug().Msg("ignoring, as latency is too high")
} else {
l.Err(err).Msg("error while connecting to server, skipping...")
}
continue
}
elapsed := time.Since(now)
conn.Close()
l.Debug().Str("latency", elapsed.String()).Msg("connected and retrieved latency")
// We use Clone() so that we don't copy pointers.
resChan <- &ServerLatency{
Latency: &elapsed,
Region: reg.Region.Clone(),
Server: reg.Server.Clone(),
}
}
}
func updateConfigMap(ctx context.Context, clientset *kubernetes.Clientset, namespace string, latencies []*ServerLatency) error {
cfg := clientset.CoreV1().ConfigMaps(namespace)
exists := true
confMap, err := cfg.Get(ctx, defaultConfMapName, metav1.GetOptions{})
if err != nil {
if !kerr.IsNotFound(err) {
return err
}
exists = false
confMap = &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: defaultConfMapName,
Namespace: namespace,
Annotations: map[string]string{},
},
BinaryData: map[string][]byte{},
}
}
data, err := yaml.Marshal(latencies)
if err != nil {
return err
}
confMap.BinaryData["regions"] = data
confMap.Annotations["last-update"] = time.Now().String()
if exists {
_, err = cfg.Update(ctx, confMap, metav1.UpdateOptions{})
} else {
_, err = cfg.Create(ctx, confMap, metav1.CreateOptions{})
}
return err
}