gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/runsc/metricserver/metricserver_test.go (about)

     1  // Copyright 2023 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package metricserver
    16  
    17  import (
    18  	"io/fs"
    19  	"os"
    20  	"syscall"
    21  	"testing"
    22  	"time"
    23  )
    24  
    25  type fakeFileInfo struct {
    26  	fs.FileInfo
    27  
    28  	modTime time.Time
    29  	size    int64
    30  	sys     any
    31  }
    32  
    33  func (f *fakeFileInfo) ModTime() time.Time { return f.modTime }
    34  
    35  func (f *fakeFileInfo) Size() int64 { return f.size }
    36  
    37  func (f *fakeFileInfo) Sys() any { return f.sys }
    38  
    39  // TestSufficientlyEqualStats tests sufficientlyEqualStats.
    40  func TestSufficientlyEqualStats(t *testing.T) {
    41  	now := time.Now()
    42  	twoHoursAgo := now.Add(-2 * time.Hour)
    43  	for _, test := range []struct {
    44  		name string
    45  		a, b os.FileInfo
    46  		want bool
    47  	}{
    48  		{
    49  			name: "empty",
    50  			a:    &fakeFileInfo{},
    51  			b:    &fakeFileInfo{},
    52  			want: true,
    53  		},
    54  		{
    55  			name: "different modification time",
    56  			a: &fakeFileInfo{
    57  				modTime: twoHoursAgo,
    58  			},
    59  			b: &fakeFileInfo{
    60  				modTime: now,
    61  			},
    62  			want: false,
    63  		},
    64  		{
    65  			name: "different size",
    66  			a: &fakeFileInfo{
    67  				size: 1337,
    68  			},
    69  			b: &fakeFileInfo{
    70  				size: 42,
    71  			},
    72  			want: false,
    73  		},
    74  		{
    75  			name: "same mod time and size, not a syscall.Stat_t",
    76  			a: &fakeFileInfo{
    77  				modTime: twoHoursAgo,
    78  				size:    1337,
    79  				sys:     struct{ foo string }{"bla"},
    80  			},
    81  			b: &fakeFileInfo{
    82  				modTime: twoHoursAgo,
    83  				size:    1337,
    84  				sys:     struct{ foo int }{42},
    85  			},
    86  			want: true,
    87  		},
    88  		{
    89  			name: "same mod time and size, only one is *syscall.Stat_t",
    90  			a: &fakeFileInfo{
    91  				modTime: twoHoursAgo,
    92  				size:    1337,
    93  				sys:     &syscall.Stat_t{},
    94  			},
    95  			b: &fakeFileInfo{
    96  				modTime: twoHoursAgo,
    97  				size:    1337,
    98  				sys:     struct{ foo string }{"blablabla"},
    99  			},
   100  			want: false,
   101  		},
   102  		{
   103  			name: "same mod time and size, one is *syscall.Stat_t, other is syscall.Stat_t",
   104  			a: &fakeFileInfo{
   105  				modTime: twoHoursAgo,
   106  				size:    1337,
   107  				sys:     &syscall.Stat_t{},
   108  			},
   109  			b: &fakeFileInfo{
   110  				modTime: twoHoursAgo,
   111  				size:    1337,
   112  				sys:     syscall.Stat_t{},
   113  			},
   114  			want: false,
   115  		},
   116  		{
   117  			name: "same mod time and size, two empty *syscall.Stat_t",
   118  			a: &fakeFileInfo{
   119  				modTime: twoHoursAgo,
   120  				size:    1337,
   121  				sys:     &syscall.Stat_t{},
   122  			},
   123  			b: &fakeFileInfo{
   124  				modTime: twoHoursAgo,
   125  				size:    1337,
   126  				sys:     &syscall.Stat_t{},
   127  			},
   128  			want: true,
   129  		},
   130  		{
   131  			name: "same mod time and size, different *syscall.Stat_t.Dev",
   132  			a: &fakeFileInfo{
   133  				modTime: twoHoursAgo,
   134  				size:    1337,
   135  				sys: &syscall.Stat_t{
   136  					Dev: 42,
   137  				},
   138  			},
   139  			b: &fakeFileInfo{
   140  				modTime: twoHoursAgo,
   141  				size:    1337,
   142  				sys: &syscall.Stat_t{
   143  					Dev: 43,
   144  				},
   145  			},
   146  			want: false,
   147  		},
   148  		{
   149  			name: "same mod time and size, different *syscall.Stat_t.Ino",
   150  			a: &fakeFileInfo{
   151  				modTime: twoHoursAgo,
   152  				size:    1337,
   153  				sys: &syscall.Stat_t{
   154  					Ino: 42,
   155  				},
   156  			},
   157  			b: &fakeFileInfo{
   158  				modTime: twoHoursAgo,
   159  				size:    1337,
   160  				sys: &syscall.Stat_t{
   161  					Ino: 43,
   162  				},
   163  			},
   164  			want: false,
   165  		},
   166  		{
   167  			name: "same mod time and size, same *syscall.Stat_t.{Dev,Ino}",
   168  			a: &fakeFileInfo{
   169  				modTime: twoHoursAgo,
   170  				size:    1337,
   171  				sys: &syscall.Stat_t{
   172  					Ino: 42,
   173  					Dev: 44,
   174  				},
   175  			},
   176  			b: &fakeFileInfo{
   177  				modTime: twoHoursAgo,
   178  				size:    1337,
   179  				sys: &syscall.Stat_t{
   180  					Ino: 42,
   181  					Dev: 44,
   182  				},
   183  			},
   184  			want: true,
   185  		},
   186  	} {
   187  		t.Run(test.name, func(t *testing.T) {
   188  			got := sufficientlyEqualStats(test.a, test.b)
   189  			if got != test.want {
   190  				t.Errorf("got equal=%t want %t", got, test.want)
   191  			}
   192  			gotReverse := sufficientlyEqualStats(test.b, test.a)
   193  			if gotReverse != got {
   194  				t.Errorf("sufficientlyEqualStats(a, b) = %v yet sufficientlyEqualStats(b, a) = %v", got, gotReverse)
   195  			}
   196  		})
   197  	}
   198  }