140 lines
3.0 KiB
Go
140 lines
3.0 KiB
Go
package server
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import (
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"context"
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"crypto/tls"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"go.uber.org/zap"
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"github.com/status-im/status-go/logutils"
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)
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type Server struct {
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run bool
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server *http.Server
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logger *zap.Logger
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cert *tls.Certificate
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hostname string
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port int
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handlers HandlerPatternMap
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afterPortChanged func(port int)
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}
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func NewServer(cert *tls.Certificate, hostname string, afterPortChanged func(int)) Server {
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return Server{logger: logutils.ZapLogger(), cert: cert, hostname: hostname, afterPortChanged: afterPortChanged}
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}
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func (s *Server) getHost() string {
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// TODO consider returning an error if s.getPort returns `0`, as this means that the listener is not ready
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return fmt.Sprintf("%s:%d", s.hostname, s.port)
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}
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func (s *Server) listenAndServe() {
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cfg := &tls.Config{Certificates: []tls.Certificate{*s.cert}, ServerName: s.hostname, MinVersion: tls.VersionTLS12}
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// in case of restart, we should use the same port as the first start in order not to break existing links
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listener, err := tls.Listen("tcp", s.getHost(), cfg)
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if err != nil {
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s.logger.Error("failed to start server, retrying", zap.Error(err))
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s.port = 0
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err = s.Start()
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if err != nil {
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s.logger.Error("server start failed, giving up", zap.Error(err))
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}
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return
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}
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s.port = listener.Addr().(*net.TCPAddr).Port
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if s.afterPortChanged != nil {
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s.afterPortChanged(s.port)
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}
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s.run = true
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err = s.server.Serve(listener)
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if err != http.ErrServerClosed {
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s.logger.Error("server failed unexpectedly, restarting", zap.Error(err))
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err = s.Start()
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if err != nil {
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s.logger.Error("server start failed, giving up", zap.Error(err))
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}
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return
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}
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s.run = false
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}
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func (s *Server) resetServer() {
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s.server = new(http.Server)
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}
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func (s *Server) applyHandlers() {
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if s.server == nil {
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s.server = new(http.Server)
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}
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mux := http.NewServeMux()
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for p, h := range s.handlers {
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mux.HandleFunc(p, h)
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}
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s.server.Handler = mux
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}
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func (s *Server) Start() error {
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// Once Shutdown has been called on a server, it may not be reused;
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s.resetServer()
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s.applyHandlers()
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go s.listenAndServe()
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return nil
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}
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func (s *Server) Stop() error {
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if s.server != nil {
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return s.server.Shutdown(context.Background())
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}
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return nil
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}
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func (s *Server) ToForeground() {
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if !s.run && (s.server != nil) {
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err := s.Start()
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if err != nil {
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s.logger.Error("server start failed during foreground transition", zap.Error(err))
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}
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}
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}
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func (s *Server) ToBackground() {
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if s.run {
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err := s.Stop()
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if err != nil {
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s.logger.Error("server stop failed during background transition", zap.Error(err))
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}
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}
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}
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func (s *Server) SetHandlers(handlers HandlerPatternMap) {
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s.handlers = handlers
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}
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func (s *Server) AddHandlers(handlers HandlerPatternMap) {
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if s.handlers == nil {
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s.handlers = make(HandlerPatternMap)
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}
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for name := range handlers {
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s.handlers[name] = handlers[name]
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}
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}
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func (s *Server) MakeBaseURL() *url.URL {
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return &url.URL{
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Scheme: "https",
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Host: s.getHost(),
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}
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}
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