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testutil.go
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testutil.go
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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Package testutil include useful test utilities for the handshaker.
package testutil
import (
"bytes"
"encoding/binary"
"io"
"net"
"sync"
"google.golang.org/grpc/credentials/alts/core/conn"
)
// Stats is used to collect statistics about concurrent handshake calls.
type Stats struct {
mu sync.Mutex
calls int
MaxConcurrentCalls int
}
// Update updates the statistics by adding one call.
func (s *Stats) Update() func() {
s.mu.Lock()
s.calls++
if s.calls > s.MaxConcurrentCalls {
s.MaxConcurrentCalls = s.calls
}
s.mu.Unlock()
return func() {
s.mu.Lock()
s.calls--
s.mu.Unlock()
}
}
// Reset resets the statistics.
func (s *Stats) Reset() {
s.mu.Lock()
defer s.mu.Unlock()
s.calls = 0
s.MaxConcurrentCalls = 0
}
// testConn mimics a net.Conn to the peer.
type testConn struct {
net.Conn
in *bytes.Buffer
out *bytes.Buffer
}
// NewTestConn creates a new instance of testConn object.
func NewTestConn(in *bytes.Buffer, out *bytes.Buffer) net.Conn {
return &testConn{
in: in,
out: out,
}
}
// Read reads from the in buffer.
func (c *testConn) Read(b []byte) (n int, err error) {
return c.in.Read(b)
}
// Write writes to the out buffer.
func (c *testConn) Write(b []byte) (n int, err error) {
return c.out.Write(b)
}
// Close closes the testConn object.
func (c *testConn) Close() error {
return nil
}
// unresponsiveTestConn mimics a net.Conn for an unresponsive peer. It is used
// for testing the PeerNotResponding case.
type unresponsiveTestConn struct {
net.Conn
}
// NewUnresponsiveTestConn creates a new instance of unresponsiveTestConn object.
func NewUnresponsiveTestConn() net.Conn {
return &unresponsiveTestConn{}
}
// Read reads from the in buffer.
func (c *unresponsiveTestConn) Read(b []byte) (n int, err error) {
return 0, io.EOF
}
// Write writes to the out buffer.
func (c *unresponsiveTestConn) Write(b []byte) (n int, err error) {
return 0, nil
}
// Close closes the TestConn object.
func (c *unresponsiveTestConn) Close() error {
return nil
}
// MakeFrame creates a handshake frame.
func MakeFrame(pl string) []byte {
f := make([]byte, len(pl)+conn.MsgLenFieldSize)
binary.LittleEndian.PutUint32(f, uint32(len(pl)))
copy(f[conn.MsgLenFieldSize:], []byte(pl))
return f
}