File size: 3,895 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | // Copyright 2025 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cgroup_test
import (
"internal/runtime/cgroup"
"strings"
"testing"
)
type nextLine struct {
line string
incomplete bool // next call before this line should return incomplete
}
func complete(s string) nextLine {
return nextLine{line: s}
}
func incomplete(s string) nextLine {
return nextLine{line: s, incomplete: true}
}
const scratchSize = 8
var readerTests = []struct {
name string
contents string
want []nextLine
}{
{
name: "empty",
contents: "",
},
{
name: "single",
contents: "1234\n",
want: []nextLine{
complete("1234"),
},
},
{
name: "single-incomplete",
contents: "1234",
want: []nextLine{
incomplete("1234"),
},
},
{
name: "single-exact",
contents: "1234567\n",
want: []nextLine{
complete("1234567"),
},
},
{
name: "single-exact-incomplete",
contents: "12345678",
want: []nextLine{
incomplete("12345678"),
},
},
{
name: "multi",
contents: `1234
5678
`,
want: []nextLine{
complete("1234"),
complete("5678"),
},
},
{
name: "multi-short",
contents: `12
34
56
78
`,
want: []nextLine{
complete("12"),
complete("34"),
complete("56"),
complete("78"),
},
},
{
name: "multi-notrailingnewline",
contents: `1234
5678`,
want: []nextLine{
complete("1234"),
incomplete("5678"),
},
},
{
name: "middle-too-long",
contents: `1234
1234567890
5678
`,
want: []nextLine{
complete("1234"),
incomplete("12345678"),
complete("5678"),
},
},
{
// Multiple reads required to find newline.
name: "middle-way-too-long",
contents: `1234
12345678900000000000000000000000000000000000000000000000000
5678
`,
want: []nextLine{
complete("1234"),
incomplete("12345678"),
complete("5678"),
},
},
}
func TestLineReader(t *testing.T) {
for _, tc := range readerTests {
t.Run(tc.name, func(t *testing.T) {
var scratch [scratchSize]byte
l := cgroup.NewLineReader(0, scratch[:], readString(tc.contents))
var got []nextLine
for {
err := l.Next()
if err == cgroup.ErrEOF {
break
} else if err == cgroup.ErrIncompleteLine {
got = append(got, incomplete(string(l.Line())))
} else if err != nil {
t.Fatalf("next got err %v", err)
} else {
got = append(got, complete(string(l.Line())))
}
}
if len(got) != len(tc.want) {
t.Logf("got lines %+v", got)
t.Logf("want lines %+v", tc.want)
t.Fatalf("lineReader got %d lines, want %d", len(got), len(tc.want))
}
for i := range got {
if got[i].line != tc.want[i].line {
t.Errorf("line %d got %q want %q", i, got[i].line, tc.want[i].line)
}
if got[i].incomplete != tc.want[i].incomplete {
t.Errorf("line %d got incomplete %v want %v", i, got[i].incomplete, tc.want[i].incomplete)
}
}
})
}
}
func FuzzLineReader(f *testing.F) {
for _, tc := range readerTests {
f.Add(tc.contents)
}
f.Fuzz(func(t *testing.T, input string) {
scratch := make([]byte, scratchSize)
reader := cgroup.NewLineReader(0, scratch, readString(input))
for expected := range strings.Lines(input) {
err := reader.Next()
line := reader.Line()
var expectedErr error
if len(expected) > scratchSize {
expected = expected[:scratchSize]
expectedErr = cgroup.ErrIncompleteLine
} else if expected[len(expected)-1] == '\n' {
expected = expected[:len(expected)-1]
} else {
expectedErr = cgroup.ErrIncompleteLine
}
if err != expectedErr {
t.Fatalf("got err %v, want %v", err, expectedErr)
}
if string(line) != expected {
t.Fatalf("got %q, want %q", string(line), expected)
}
}
err := reader.Next()
if err != cgroup.ErrEOF {
t.Fatalf("got %v, want EOF", err)
}
})
}
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