add tunnel feature for relay

ingress/ingress.go

@@ -0,0 +1,304 @@
+package ingress
+
+import (
+	"bufio"
+	"context"
+	"io"
+	"net"
+	"strings"
+	"sync"
+	"time"
+
+	ingress_pkg "github.com/go-gost/core/ingress"
+	"github.com/go-gost/core/logger"
+	"github.com/go-gost/x/internal/loader"
+)
+
+type Rule struct {
+	Host     string
+	Endpoint string
+}
+
+type options struct {
+	rules       []Rule
+	fileLoader  loader.Loader
+	redisLoader loader.Loader
+	httpLoader  loader.Loader
+	period      time.Duration
+	logger      logger.Logger
+}
+
+type Option func(opts *options)
+
+func RulesOption(rules []Rule) Option {
+	return func(opts *options) {
+		opts.rules = rules
+	}
+}
+
+func ReloadPeriodOption(period time.Duration) Option {
+	return func(opts *options) {
+		opts.period = period
+	}
+}
+
+func FileLoaderOption(fileLoader loader.Loader) Option {
+	return func(opts *options) {
+		opts.fileLoader = fileLoader
+	}
+}
+
+func RedisLoaderOption(redisLoader loader.Loader) Option {
+	return func(opts *options) {
+		opts.redisLoader = redisLoader
+	}
+}
+
+func HTTPLoaderOption(httpLoader loader.Loader) Option {
+	return func(opts *options) {
+		opts.httpLoader = httpLoader
+	}
+}
+
+func LoggerOption(logger logger.Logger) Option {
+	return func(opts *options) {
+		opts.logger = logger
+	}
+}
+
+type ingress struct {
+	rules      map[string]Rule
+	cancelFunc context.CancelFunc
+	options    options
+	mu         sync.RWMutex
+}
+
+// NewIngress creates and initializes a new Ingress.
+func NewIngress(opts ...Option) ingress_pkg.Ingress {
+	var options options
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	ctx, cancel := context.WithCancel(context.TODO())
+
+	ing := &ingress{
+		cancelFunc: cancel,
+		options:    options,
+	}
+
+	if err := ing.reload(ctx); err != nil {
+		options.logger.Warnf("reload: %v", err)
+	}
+	if ing.options.period > 0 {
+		go ing.periodReload(ctx)
+	}
+
+	return ing
+}
+
+func (ing *ingress) periodReload(ctx context.Context) error {
+	period := ing.options.period
+	if period < time.Second {
+		period = time.Second
+	}
+	ticker := time.NewTicker(period)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			if err := ing.reload(ctx); err != nil {
+				ing.options.logger.Warnf("reload: %v", err)
+				// return err
+			}
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+}
+
+func (ing *ingress) reload(ctx context.Context) error {
+	rules := make(map[string]Rule)
+
+	fn := func(rule Rule) {
+		if rule.Host == "" || rule.Endpoint == "" {
+			return
+		}
+		host := rule.Host
+		if host[0] == '*' {
+			host = "." + host[1:]
+		}
+		rules[host] = rule
+	}
+
+	for _, rule := range ing.options.rules {
+		fn(rule)
+	}
+
+	v, err := ing.load(ctx)
+	if err != nil {
+		return err
+	}
+	for _, rule := range v {
+		fn(rule)
+	}
+
+	ing.mu.Lock()
+	defer ing.mu.Unlock()
+
+	ing.rules = rules
+
+	return nil
+}
+
+func (ing *ingress) load(ctx context.Context) (rules []Rule, err error) {
+	if ing.options.fileLoader != nil {
+		if lister, ok := ing.options.fileLoader.(loader.Lister); ok {
+			list, er := lister.List(ctx)
+			if er != nil {
+				ing.options.logger.Warnf("file loader: %v", er)
+			}
+			for _, s := range list {
+				rules = append(rules, ing.parseLine(s))
+			}
+		} else {
+			r, er := ing.options.fileLoader.Load(ctx)
+			if er != nil {
+				ing.options.logger.Warnf("file loader: %v", er)
+			}
+			if v, _ := ing.parseRules(r); v != nil {
+				rules = append(rules, v...)
+			}
+		}
+	}
+	if ing.options.redisLoader != nil {
+		if lister, ok := ing.options.redisLoader.(loader.Lister); ok {
+			list, er := lister.List(ctx)
+			if er != nil {
+				ing.options.logger.Warnf("redis loader: %v", er)
+			}
+			for _, v := range list {
+				rules = append(rules, ing.parseLine(v))
+			}
+		} else {
+			r, er := ing.options.redisLoader.Load(ctx)
+			if er != nil {
+				ing.options.logger.Warnf("redis loader: %v", er)
+			}
+			v, _ := ing.parseRules(r)
+			rules = append(rules, v...)
+		}
+	}
+	if ing.options.httpLoader != nil {
+		r, er := ing.options.httpLoader.Load(ctx)
+		if er != nil {
+			ing.options.logger.Warnf("http loader: %v", er)
+		}
+		v, _ := ing.parseRules(r)
+		rules = append(rules, v...)
+	}
+
+	ing.options.logger.Debugf("load items %d", len(rules))
+	return
+}
+
+func (ing *ingress) parseRules(r io.Reader) (rules []Rule, err error) {
+	if r == nil {
+		return
+	}
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		if rule := ing.parseLine(scanner.Text()); rule.Host != "" {
+			rules = append(rules, rule)
+		}
+	}
+
+	err = scanner.Err()
+	return
+}
+
+func (ing *ingress) Get(host string) string {
+	if host == "" || ing == nil {
+		return ""
+	}
+
+	// try to strip the port
+	if v, _, _ := net.SplitHostPort(host); v != "" {
+		host = v
+	}
+
+	if ing == nil || len(ing.rules) == 0 {
+		return ""
+	}
+
+	ing.options.logger.Debugf("ingress: lookup %s", host)
+	ep := ing.lookup(host)
+	if ep == "" {
+		ep = ing.lookup("." + host)
+	}
+	if ep == "" {
+		s := host
+		for {
+			if index := strings.IndexByte(s, '.'); index > 0 {
+				ep = ing.lookup(s[index:])
+				s = s[index+1:]
+				if ep == "" {
+					continue
+				}
+			}
+			break
+		}
+	}
+
+	if ep != "" {
+		ing.options.logger.Debugf("ingress: %s -> %s", host, ep)
+	}
+
+	return ep
+}
+
+func (ing *ingress) lookup(host string) string {
+	if ing == nil || len(ing.rules) == 0 {
+		return ""
+	}
+
+	ing.mu.RLock()
+	defer ing.mu.RUnlock()
+
+	return ing.rules[host].Endpoint
+}
+
+func (ing *ingress) parseLine(s string) (rule Rule) {
+	line := strings.Replace(s, "\t", " ", -1)
+	line = strings.TrimSpace(line)
+	if n := strings.IndexByte(line, '#'); n >= 0 {
+		line = line[:n]
+	}
+	var sp []string
+	for _, s := range strings.Split(line, " ") {
+		if s = strings.TrimSpace(s); s != "" {
+			sp = append(sp, s)
+		}
+	}
+	if len(sp) < 2 {
+		return // invalid lines are ignored
+	}
+
+	return Rule{
+		Host:     sp[0],
+		Endpoint: sp[1],
+	}
+}
+
+func (ing *ingress) Close() error {
+	ing.cancelFunc()
+	if ing.options.fileLoader != nil {
+		ing.options.fileLoader.Close()
+	}
+	if ing.options.redisLoader != nil {
+		ing.options.redisLoader.Close()
+	}
+	return nil
+}