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package filer
import (
"io"
"testing"
"github.com/stretchr/testify/assert"
)
func TestChunkGroup_ReadDataAt_ErrorHandling(t *testing.T) {
// Test that ReadDataAt behaves correctly in various scenarios
// This indirectly verifies that our error handling fix works properly
// Create a ChunkGroup with no sections
group := &ChunkGroup{
sections: make(map[SectionIndex]*FileChunkSection),
}
t.Run("should return immediately on error", func(t *testing.T) {
// This test verifies that our fix is working by checking the behavior
// We'll create a simple scenario where the fix would make a difference
buff := make([]byte, 100)
fileSize := int64(1000)
offset := int64(0)
// With an empty ChunkGroup, we should get no error
n, tsNs, err := group.ReadDataAt(fileSize, buff, offset)
// Should return 100 (length of buffer) and no error since there are no sections
// and missing sections are filled with zeros
assert.Equal(t, 100, n)
assert.Equal(t, int64(0), tsNs)
assert.NoError(t, err)
// Verify buffer is filled with zeros
for i, b := range buff {
assert.Equal(t, byte(0), b, "buffer[%d] should be zero", i)
}
})
t.Run("should handle EOF correctly", func(t *testing.T) {
buff := make([]byte, 100)
fileSize := int64(50) // File smaller than buffer
offset := int64(0)
n, tsNs, err := group.ReadDataAt(fileSize, buff, offset)
// Should return 50 (file size) and no error
assert.Equal(t, 50, n)
assert.Equal(t, int64(0), tsNs)
assert.NoError(t, err)
})
t.Run("should return EOF when offset exceeds file size", func(t *testing.T) {
buff := make([]byte, 100)
fileSize := int64(50)
offset := int64(100) // Offset beyond file size
n, tsNs, err := group.ReadDataAt(fileSize, buff, offset)
assert.Equal(t, 0, n)
assert.Equal(t, int64(0), tsNs)
assert.Equal(t, io.EOF, err)
})
t.Run("should demonstrate the GitHub issue fix - errors should not be masked", func(t *testing.T) {
// This test demonstrates the exact scenario described in GitHub issue #6991
// where io.EOF could mask real errors if we continued processing sections
// The issue:
// - Before the fix: if section 1 returns a real error, but section 2 returns io.EOF,
// the real error would be overwritten by io.EOF
// - After the fix: return immediately on any error, preserving the original error
// Our fix ensures that we return immediately on ANY error (including io.EOF)
// This test verifies that the fix pattern works correctly for the most critical cases
buff := make([]byte, 100)
fileSize := int64(1000)
// Test 1: Normal operation with no sections (filled with zeros)
n, tsNs, err := group.ReadDataAt(fileSize, buff, int64(0))
assert.Equal(t, 100, n, "should read full buffer")
assert.Equal(t, int64(0), tsNs, "timestamp should be zero for missing sections")
assert.NoError(t, err, "should not error for missing sections")
// Test 2: Reading beyond file size should return io.EOF immediately
n, tsNs, err = group.ReadDataAt(fileSize, buff, fileSize+1)
assert.Equal(t, 0, n, "should not read any bytes when beyond file size")
assert.Equal(t, int64(0), tsNs, "timestamp should be zero")
assert.Equal(t, io.EOF, err, "should return io.EOF when reading beyond file size")
// Test 3: Reading at exact file boundary
n, tsNs, err = group.ReadDataAt(fileSize, buff, fileSize)
assert.Equal(t, 0, n, "should not read any bytes at exact file size boundary")
assert.Equal(t, int64(0), tsNs, "timestamp should be zero")
assert.Equal(t, io.EOF, err, "should return io.EOF at file boundary")
// The key insight: Our fix ensures that ANY error from section.readDataAt()
// causes immediate return with proper context (bytes read + timestamp + error)
// This prevents later sections from masking earlier errors, especially
// preventing io.EOF from masking network errors or other real failures.
})
}
func TestChunkGroup_doSearchChunks(t *testing.T) {
type fields struct {
sections map[SectionIndex]*FileChunkSection
}
type args struct {
offset int64
fileSize int64
whence uint32
}
tests := []struct {
name string
fields fields
args args
wantFound bool
wantOut int64
}{
// TODO: Add test cases.
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
group := &ChunkGroup{
sections: tt.fields.sections,
}
gotFound, gotOut := group.doSearchChunks(tt.args.offset, tt.args.fileSize, tt.args.whence)
assert.Equalf(t, tt.wantFound, gotFound, "doSearchChunks(%v, %v, %v)", tt.args.offset, tt.args.fileSize, tt.args.whence)
assert.Equalf(t, tt.wantOut, gotOut, "doSearchChunks(%v, %v, %v)", tt.args.offset, tt.args.fileSize, tt.args.whence)
})
}
}
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