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writer.go
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writer.go
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// Package writer defines database writers responsible
// for generating test mmdb files.
package writer
import (
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"github.com/maxmind/mmdbwriter"
)
var ipSample = []string{
"::1.1.1.0/120",
"::2.2.0.0/112",
"::3.0.0.0/104",
"::4.5.6.7/128",
"abcd::/64",
"1000::1234:0000/112",
}
// Writer is responsible for writing test mmdb databases
// based on the provided data sources.
type Writer struct {
source string
target string
}
// New initializes a new test database writer struct.
func New(source, target string) (*Writer, error) {
s := filepath.Clean(source)
if _, err := os.Stat(s); errors.Is(err, fs.ErrNotExist) {
return nil, fmt.Errorf("source directory does not exist: %w", err)
}
t := filepath.Clean(target)
if err := os.MkdirAll(t, os.ModePerm); err != nil {
return nil, fmt.Errorf("creating target directory: %w", err)
}
return &Writer{
source: s,
target: t,
}, nil
}
func (w *Writer) write(dbWriter *mmdbwriter.Tree, fileName string) error {
outputFile, err := os.Create(filepath.Clean(filepath.Join(w.target, fileName)))
if err != nil {
return fmt.Errorf("creating mmdb file: %w", err)
}
defer outputFile.Close()
if _, err := dbWriter.WriteTo(outputFile); err != nil {
return fmt.Errorf("writing mmdb file: %w", err)
}
return nil
}