server: return the author of a tear down request

pkg/liberrors/server.go

@@ -2,6 +2,7 @@ package liberrors
 
 import (
 	"fmt"
+	"net"
 
 	"github.com/aler9/gortsplib/pkg/base"
 	"github.com/aler9/gortsplib/pkg/headers"
@@ -224,11 +225,13 @@ func (e ErrServerLinkedToOtherSession) Error() string {
 }
 
 // ErrServerSessionTeardown is an error that can be returned by a server.
-type ErrServerSessionTeardown struct{}
+type ErrServerSessionTeardown struct {
+	Author net.Addr
+}
 
 // Error implements the error interface.
 func (e ErrServerSessionTeardown) Error() string {
-	return "teared down by a request"
+	return fmt.Sprintf("teared down by %v", e.Author)
 }
 
 // ErrServerSessionLinkedToOtherConn is an error that can be returned by a server.

serversession.go

@@ -1019,7 +1019,7 @@ func (ss *ServerSession) handleRequest(sc *ServerConn, req *base.Request) (*base
 	case base.Teardown:
 		return &base.Response{
 			StatusCode: base.StatusOK,
-		}, liberrors.ErrServerSessionTeardown{}
+		}, liberrors.ErrServerSessionTeardown{Author: sc.NetConn().RemoteAddr()}
 
 	case base.GetParameter:
 		if h, ok := sc.s.Handler.(ServerHandlerOnGetParameter); ok {