github.com/coyove/sdss@v0.0.0-20231129015646-c2ec58cca6a2/future/chrony/client_test.go (about)

     1  /*
     2  Copyright (c) Facebook, Inc. and its affiliates.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package chrony
    18  
    19  import (
    20  	"bytes"
    21  	"encoding/binary"
    22  	"fmt"
    23  	"net"
    24  	"testing"
    25  
    26  	"github.com/stretchr/testify/require"
    27  )
    28  
    29  // fakeConn gives us fake io.ReadWriter interacted implementation for which we can provide fake outputs
    30  type fakeConn struct {
    31  	readCount int
    32  	outputs   []*bytes.Buffer
    33  }
    34  
    35  func newConn(outputs []*bytes.Buffer) *fakeConn {
    36  	return &fakeConn{
    37  		readCount: 0,
    38  		outputs:   outputs,
    39  	}
    40  }
    41  
    42  func (c *fakeConn) Read(p []byte) (n int, err error) {
    43  	pos := c.readCount
    44  	if c.readCount < len(c.outputs) {
    45  		c.readCount++
    46  		return c.outputs[pos].Read(p)
    47  	}
    48  	return 0, fmt.Errorf("EOF")
    49  }
    50  
    51  func (c *fakeConn) Write(p []byte) (n int, err error) {
    52  	// here we may assert writes
    53  	return 0, nil
    54  }
    55  
    56  // Test if we have errors when there is nothing on the line to read
    57  func TestCommunicateEOF(t *testing.T) {
    58  	conn := newConn([]*bytes.Buffer{
    59  		bytes.NewBuffer([]byte{}),
    60  	})
    61  	client := Client{Sequence: 1, Connection: conn}
    62  	_, err := client.Communicate(NewTrackingPacket())
    63  	require.Error(t, err)
    64  }
    65  
    66  func TestCommunicateError(t *testing.T) {
    67  	var err error
    68  	buf := &bytes.Buffer{}
    69  	packetHead := ReplyHead{
    70  		Version:  protoVersionNumber,
    71  		PKTType:  pktTypeCmdReply,
    72  		Res1:     0,
    73  		Res2:     0,
    74  		Command:  reqTracking,
    75  		Reply:    rpyTracking,
    76  		Status:   sttNoSuchSource,
    77  		Pad1:     0,
    78  		Pad2:     0,
    79  		Pad3:     0,
    80  		Sequence: 2,
    81  		Pad4:     0,
    82  		Pad5:     0,
    83  	}
    84  	packetBody := replyTrackingContent{}
    85  	err = binary.Write(buf, binary.BigEndian, packetHead)
    86  	require.NoError(t, err)
    87  	err = binary.Write(buf, binary.BigEndian, packetBody)
    88  	require.NoError(t, err)
    89  	conn := newConn([]*bytes.Buffer{
    90  		buf,
    91  	})
    92  	client := Client{Sequence: 1, Connection: conn}
    93  	_, err = client.Communicate(NewTrackingPacket())
    94  	require.Error(t, err)
    95  }
    96  
    97  // Test if we can read reply properly
    98  func TestCommunicateOK(t *testing.T) {
    99  	var err error
   100  	buf := &bytes.Buffer{}
   101  	packetHead := ReplyHead{
   102  		Version:  protoVersionNumber,
   103  		PKTType:  pktTypeCmdReply,
   104  		Res1:     0,
   105  		Res2:     0,
   106  		Command:  reqTracking,
   107  		Reply:    rpyTracking,
   108  		Status:   sttSuccess,
   109  		Pad1:     0,
   110  		Pad2:     0,
   111  		Pad3:     0,
   112  		Sequence: 2,
   113  		Pad4:     0,
   114  		Pad5:     0,
   115  	}
   116  	packetBody := replyTrackingContent{
   117  		RefID:              1,
   118  		IPAddr:             *newIPAddr(net.IP([]byte{192, 168, 0, 10})),
   119  		Stratum:            3,
   120  		LeapStatus:         0,
   121  		RefTime:            timeSpec{},
   122  		CurrentCorrection:  0,
   123  		LastOffset:         12345,
   124  		RMSOffset:          0,
   125  		FreqPPM:            0,
   126  		ResidFreqPPM:       0,
   127  		SkewPPM:            0,
   128  		RootDelay:          0,
   129  		RootDispersion:     0,
   130  		LastUpdateInterval: 0,
   131  	}
   132  	err = binary.Write(buf, binary.BigEndian, packetHead)
   133  	require.NoError(t, err)
   134  	err = binary.Write(buf, binary.BigEndian, packetBody)
   135  	require.NoError(t, err)
   136  	conn := newConn([]*bytes.Buffer{
   137  		buf,
   138  	})
   139  	client := Client{Sequence: 1, Connection: conn}
   140  	p, err := client.Communicate(NewTrackingPacket())
   141  	require.NoError(t, err)
   142  	expected := &ReplyTracking{
   143  		ReplyHead: packetHead,
   144  		Tracking: Tracking{
   145  			RefID:              packetBody.RefID,
   146  			IPAddr:             net.IP([]byte{192, 168, 0, 10}),
   147  			Stratum:            packetBody.Stratum,
   148  			LeapStatus:         packetBody.LeapStatus,
   149  			RefTime:            packetBody.RefTime.ToTime(),
   150  			CurrentCorrection:  packetBody.CurrentCorrection.ToFloat(),
   151  			LastOffset:         packetBody.LastOffset.ToFloat(),
   152  			RMSOffset:          packetBody.RMSOffset.ToFloat(),
   153  			FreqPPM:            packetBody.FreqPPM.ToFloat(),
   154  			ResidFreqPPM:       packetBody.ResidFreqPPM.ToFloat(),
   155  			SkewPPM:            packetBody.SkewPPM.ToFloat(),
   156  			RootDelay:          packetBody.RootDelay.ToFloat(),
   157  			RootDispersion:     packetBody.RootDispersion.ToFloat(),
   158  			LastUpdateInterval: packetBody.LastUpdateInterval.ToFloat(),
   159  		},
   160  	}
   161  	require.Equal(t, expected, p)
   162  }