From 05c8564cc909a8354979319a19c3ef0957afe8da Mon Sep 17 00:00:00 2001
From: Vladislav Yarmak <vladislav@vm-0.com>
Date: Thu, 26 Mar 2020 15:19:10 +0200
Subject: [PATCH] drop unused module

---
 connection.go | 193 --------------------------------------------------
 1 file changed, 193 deletions(-)
 delete mode 100644 connection.go

diff --git a/connection.go b/connection.go
deleted file mode 100644
index 398cce9..0000000
--- a/connection.go
+++ /dev/null
@@ -1,193 +0,0 @@
-package main
-
-import (
-    "time"
-    "net"
-    "crypto/tls"
-    "crypto/x509"
-    "io/ioutil"
-    "errors"
-    "context"
-    "strconv"
-)
-
-const MAX_READ_CH_QLEN = 128
-const COPY_BUFFER_SIZE = 32 * 1024
-var ZEROTIME time.Time
-var EPOCH time.Time
-
-func init() {
-    EPOCH = time.Unix(0, 0)
-}
-
-type WrappedConn interface {
-    Read(p []byte) (n int, err error)
-    Write(p []byte) (n int, err error)
-    Close()
-    LocalAddr() net.Addr
-    RemoteAddr() net.Addr
-    SetDeadline(t time.Time) error
-    SetReadDeadline(t time.Time) error
-    SetWriteDeadline(t time.Time) error
-    ReadContext(ctx context.Context, p []byte) (n int, err error)
-    WriteContext(ctx context.Context, p []byte) (n int, err error)
-}
-
-type ConnFactory struct {
-    addr string
-    tlsConfig *tls.Config
-    dialer *net.Dialer
-    logger *CondLogger
-}
-
-func NewConnFactory(host string, port uint16, timeout time.Duration,
-                    certfile, keyfile string, cafile string, hostname_check bool,
-                    tls_servername string, dialers uint, logger *CondLogger) (*ConnFactory, error) {
-    if !hostname_check && cafile == "" {
-        return nil, errors.New("Hostname check should not be disabled in absence of custom CA file")
-    }
-    if certfile != "" && keyfile == "" || certfile == "" && keyfile != "" {
-        return nil, errors.New("Certificate file and key file must be specified only together")
-    }
-    var certs []tls.Certificate
-    if certfile != "" && keyfile != "" {
-        cert, err := tls.LoadX509KeyPair(certfile, keyfile)
-        if err != nil {
-            return nil, err
-        }
-        certs = append(certs, cert)
-    }
-    var roots *x509.CertPool
-    if cafile == "" {
-        sysroots, err := x509.SystemCertPool()
-        if err != nil {
-            return nil, err
-        }
-        roots = sysroots
-    } else {
-        roots = x509.NewCertPool()
-        certs, err := ioutil.ReadFile(cafile)
-        if err != nil {
-            return nil, err
-        }
-        if ok := roots.AppendCertsFromPEM(certs); !ok {
-            return nil, errors.New("Failed to load CA certificates")
-        }
-    }
-    servername := host
-    if tls_servername != "" {
-        servername = tls_servername
-    }
-    tlsConfig := tls.Config{
-        RootCAs: roots,
-        ServerName: servername,
-        Certificates: certs,
-    }
-    if !hostname_check {
-        tlsConfig.InsecureSkipVerify = true
-        tlsConfig.VerifyPeerCertificate = func(certificates [][]byte, _ [][]*x509.Certificate) error {
-            certs := make([]*x509.Certificate, len(certificates))
-            for i, asn1Data := range certificates {
-                cert, err := x509.ParseCertificate(asn1Data)
-                if err != nil {
-                    return errors.New("tls: failed to parse certificate from server: " + err.Error())
-                }
-                certs[i] = cert
-            }
-
-            opts := x509.VerifyOptions{
-                Roots:         roots, // On the server side, use config.ClientCAs.
-                DNSName:       "", // No hostname check
-                Intermediates: x509.NewCertPool(),
-            }
-            for _, cert := range certs[1:] {
-                opts.Intermediates.AddCert(cert)
-            }
-            _, err := certs[0].Verify(opts)
-            return err
-        }
-    }
-    return &ConnFactory{
-        addr: net.JoinHostPort(host, strconv.Itoa(int(port))),
-        tlsConfig: &tlsConfig,
-        dialer: &net.Dialer{Timeout: timeout},
-        logger: logger,
-    }, nil
-}
-
-type WrappedTLSConn struct {
-    conn *tls.Conn
-    logger *CondLogger
-}
-
-func (cf *ConnFactory) DialContext(ctx context.Context) (*WrappedTLSConn, error) {
-    var newconn *tls.Conn
-    var err error
-    ch := make(chan struct{}, 1)
-    go func () {
-        newconn, err = tls.DialWithDialer(cf.dialer, "tcp", cf.addr, cf.tlsConfig)
-        ch <- struct{}{}
-    }()
-    select {
-    case <- ch:
-        if err != nil {
-            cf.logger.Error("Got error during connection: %s", err)
-            return nil, err
-        }
-        wrappedconn := &WrappedTLSConn{
-            conn: newconn,
-            logger: cf.logger,
-        }
-        return wrappedconn, nil
-    case <- ctx.Done():
-        return nil, errors.New("Context was cancelled")
-    }
-}
-
-func (c *WrappedTLSConn) Read(p []byte) (n int, err error) {
-    return c.conn.Read(p)
-}
-
-func (c *WrappedTLSConn) Write(p []byte) (n int, err error) {
-    return c.conn.Write(p)
-}
-
-func (c *WrappedTLSConn) Close() error {
-    return c.conn.Close()
-}
-
-func (c *WrappedTLSConn) LocalAddr() net.Addr {
-    return c.conn.LocalAddr()
-}
-
-func (c *WrappedTLSConn) RemoteAddr() net.Addr {
-    return c.conn.RemoteAddr()
-}
-
-func (c *WrappedTLSConn) SetDeadline(t time.Time) error {
-    return c.conn.SetDeadline(t)
-}
-
-func (c *WrappedTLSConn) SetReadDeadline(t time.Time) error {
-    return c.conn.SetReadDeadline(t)
-}
-
-func (c *WrappedTLSConn) SetWriteDeadline(t time.Time) error {
-    return c.conn.SetWriteDeadline(t)
-}
-
-func (c *WrappedTLSConn) ReadContext(ctx context.Context, p []byte) (n int, err error) {
-    ch := make(chan struct{}, 1)
-    go func () {
-        n, err = c.conn.Read(p)
-        ch <-struct{}{}
-    }()
-    select {
-    case <-ctx.Done():
-        c.conn.SetReadDeadline(EPOCH)
-        <-ch
-        c.conn.SetReadDeadline(ZEROTIME)
-    case <-ch:
-    }
-    return
-}