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server.go
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server.go
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package xmlrpc
import (
"context"
"net"
"net/http"
"net/url"
"sync"
"time"
)
// ErrorRes is a special response that sends status code 400.
// in case of errors, the C++ implementation replies with
// <methodResponse><fault><value>..., a structure which would require additional parsing.
type ErrorRes struct{}
// ServerHandler is the prototype of the function passed to Serve().
type ServerHandler func(*RequestRaw) interface{}
// Server is a XML-RPC server.
type Server struct {
ctx context.Context
ctxCancel func()
wg sync.WaitGroup
ln net.Listener
hs *http.Server
handler ServerHandler
setHandler chan ServerHandler
done chan struct{}
}
// NewServer allocates a server.
func NewServer(address string, writeTimeout time.Duration) (*Server, error) {
// net.Listen and http.Server are splitted since the latter
// does not allow to use 0 as port
ln, err := net.Listen("tcp", address)
if err != nil {
return nil, err
}
ctx, ctxCancel := context.WithCancel(context.Background())
s := &Server{
ctx: ctx,
ctxCancel: ctxCancel,
ln: ln,
setHandler: make(chan ServerHandler),
done: make(chan struct{}),
}
s.hs = &http.Server{
Handler: http.HandlerFunc(s.handleRequest),
WriteTimeout: writeTimeout,
}
go s.run()
return s, nil
}
// Close closes all the server resources.
func (s *Server) Close() {
s.ctxCancel()
<-s.done
}
// URL returns the server URL.
func (s *Server) URL(ip net.IP, zone string) string {
return (&url.URL{
Scheme: "http",
Host: (&net.TCPAddr{
IP: ip,
Port: s.ln.Addr().(*net.TCPAddr).Port,
Zone: zone,
}).String(),
}).String()
}
func (s *Server) run() {
defer close(s.done)
select {
case handler := <-s.setHandler:
s.handler = handler
case <-s.ctx.Done():
s.ln.Close()
return
}
go s.hs.Serve(s.ln)
<-s.ctx.Done()
s.hs.Shutdown(context.Background())
s.ln.Close() // in case Shutdown() is called before Serve()
}
func (s *Server) handleRequest(w http.ResponseWriter, req *http.Request) {
if req.URL.Path != "/RPC2" && req.URL.Path != "/" {
w.WriteHeader(http.StatusNotFound)
return
}
if req.Method != http.MethodPost {
w.WriteHeader(http.StatusNotFound)
return
}
raw, err := requestDecodeRaw(req.Body)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
res := s.handler(raw)
if _, ok := res.(ErrorRes); ok {
w.WriteHeader(http.StatusBadRequest)
return
}
responseEncode(w, res) //nolint:errcheck
}
// Serve starts serving requests and waits until the server is closed.
func (s *Server) Serve(handler ServerHandler) {
select {
case s.setHandler <- handler:
case <-s.ctx.Done():
}
s.wg.Wait()
}