status-go/server/server.go

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2022-02-23 14:34:16 +00:00
package server
import (
"context"
"crypto/tls"
"fmt"
"net"
"net/http"
"net/url"
"go.uber.org/zap"
"github.com/status-im/status-go/logutils"
)
type Server struct {
run bool
server *http.Server
logger *zap.Logger
cert *tls.Certificate
hostname string
port int
handlers HandlerPatternMap
}
func NewServer(cert *tls.Certificate, hostname string) Server {
return Server{logger: logutils.ZapLogger(), cert: cert, hostname: hostname}
}
func (s *Server) getHost() string {
// TODO consider returning an error if s.getPort returns `0`, as this means that the listener is not ready
return fmt.Sprintf("%s:%d", s.hostname, s.port)
}
func (s *Server) listenAndServe() {
cfg := &tls.Config{Certificates: []tls.Certificate{*s.cert}, ServerName: s.hostname, MinVersion: tls.VersionTLS12}
// in case of restart, we should use the same port as the first start in order not to break existing links
listener, err := tls.Listen("tcp", s.getHost(), cfg)
if err != nil {
s.logger.Error("failed to start server, retrying", zap.Error(err))
s.port = 0
err = s.Start()
if err != nil {
s.logger.Error("server start failed, giving up", zap.Error(err))
}
return
}
s.port = listener.Addr().(*net.TCPAddr).Port
s.run = true
err = s.server.Serve(listener)
if err != http.ErrServerClosed {
s.logger.Error("server failed unexpectedly, restarting", zap.Error(err))
err = s.Start()
if err != nil {
s.logger.Error("server start failed, giving up", zap.Error(err))
}
return
}
s.run = false
}
func (s *Server) resetServer() {
s.server = new(http.Server)
}
func (s *Server) applyHandlers() {
if s.server == nil {
s.server = new(http.Server)
}
mux := http.NewServeMux()
for p, h := range s.handlers {
mux.HandleFunc(p, h)
}
s.server.Handler = mux
}
func (s *Server) Start() error {
// Once Shutdown has been called on a server, it may not be reused;
s.resetServer()
s.applyHandlers()
go s.listenAndServe()
return nil
}
func (s *Server) Stop() error {
if s.server != nil {
return s.server.Shutdown(context.Background())
}
return nil
}
func (s *Server) ToForeground() {
if !s.run && (s.server != nil) {
err := s.Start()
if err != nil {
s.logger.Error("server start failed during foreground transition", zap.Error(err))
}
}
}
func (s *Server) ToBackground() {
if s.run {
err := s.Stop()
if err != nil {
s.logger.Error("server stop failed during background transition", zap.Error(err))
}
}
}
func (s *Server) SetHandlers(handlers HandlerPatternMap) {
s.handlers = handlers
}
func (s *Server) MakeBaseURL() *url.URL {
return &url.URL{
Scheme: "https",
Host: s.getHost(),
}
}