X-Git-Url: http://www.git.cypherpunks.ru/?a=blobdiff_plain;f=ucspi.go;fp=ucspi.go;h=8fce33db8e726227babf533a3b0d6a08473434ab;hb=168de6871afdd60f2bc1c529170033ef56307d7c;hp=0000000000000000000000000000000000000000;hpb=adfee4423269bf180abab3131a171f34931d7037;p=gocheese.git

diff --git a/ucspi.go b/ucspi.go
new file mode 100644
index 0000000..8fce33d
--- /dev/null
+++ b/ucspi.go
@@ -0,0 +1,136 @@
+/*
+GoCheese -- Python private package repository and caching proxy
+Copyright (C) 2019-2021 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"sync"
+	"time"
+)
+
+var (
+	aLongTimeAgo = time.Unix(1, 0)
+	UCSPIJob     sync.WaitGroup
+)
+
+type UCSPIAddr struct {
+	ip   string
+	port string
+}
+
+func (addr *UCSPIAddr) Network() string { return "tcp" }
+
+func (addr *UCSPIAddr) String() string { return addr.ip + ":" + addr.port }
+
+type UCSPIConn struct {
+	eof chan struct{}
+}
+
+type ReadResult struct {
+	n   int
+	err error
+}
+
+func (conn *UCSPIConn) Read(b []byte) (int, error) {
+	c := make(chan ReadResult)
+	go func() {
+		n, err := os.Stdin.Read(b)
+		c <- ReadResult{n, err}
+	}()
+	select {
+	case res := <-c:
+		return res.n, res.err
+	case <-conn.eof:
+		return 0, io.EOF
+	}
+}
+
+func (conn *UCSPIConn) Write(b []byte) (int, error) { return os.Stdout.Write(b) }
+
+func (conn *UCSPIConn) Close() error {
+	if err := os.Stdin.Close(); err != nil {
+		return err
+	}
+	return os.Stdout.Close()
+}
+
+func (conn *UCSPIConn) LocalAddr() net.Addr {
+	return &UCSPIAddr{ip: os.Getenv("TCPLOCALIP"), port: os.Getenv("TCPLOCALPORT")}
+}
+
+func (conn *UCSPIConn) RemoteAddr() net.Addr {
+	return &UCSPIAddr{ip: os.Getenv("TCPREMOTEIP"), port: os.Getenv("TCPREMOTEPORT")}
+}
+
+func (conn *UCSPIConn) SetDeadline(t time.Time) error {
+	if err := os.Stdin.SetReadDeadline(t); err != nil {
+		return err
+	}
+	return os.Stdout.SetWriteDeadline(t)
+}
+
+func (conn *UCSPIConn) SetReadDeadline(t time.Time) error {
+	// An ugly hack to forcefully terminate pending read.
+	// net/http calls SetReadDeadline(aLongTimeAgo), but file
+	// descriptors are not capable to exit immediately that way.
+	if t.Equal(aLongTimeAgo) {
+		conn.eof <- struct{}{}
+	}
+	return os.Stdin.SetReadDeadline(t)
+}
+
+func (conn *UCSPIConn) SetWriteDeadline(t time.Time) error {
+	return os.Stdout.SetWriteDeadline(t)
+}
+
+type UCSPI struct{ accepted bool }
+
+type UCSPIAlreadyAccepted struct{}
+
+func (u UCSPIAlreadyAccepted) Error() string {
+	return "already accepted"
+}
+
+func (ucspi *UCSPI) Accept() (net.Conn, error) {
+	if ucspi.accepted {
+		return nil, UCSPIAlreadyAccepted{}
+	}
+	ucspi.accepted = true
+	conn := UCSPIConn{eof: make(chan struct{}, 1)}
+	return &conn, nil
+}
+
+func (ucspi *UCSPI) Close() error {
+	return nil
+}
+
+func (ucspi *UCSPI) Addr() net.Addr {
+	return &UCSPIAddr{ip: os.Getenv("TCPLOCALIP"), port: os.Getenv("TCPLOCALPORT")}
+}
+
+func connStater(conn net.Conn, connState http.ConnState) {
+	switch connState {
+	case http.StateNew:
+		UCSPIJob.Add(1)
+	case http.StateClosed:
+		UCSPIJob.Done()
+	}
+}