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package jsonl |
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import ( |
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"adrianolaselva.github.io/csvql/pkg/exportdata" |
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"bytes" |
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"database/sql" |
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"encoding/json" |
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"fmt" |
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"github.com/schollz/progressbar/v3" |
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"os" |
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"path/filepath" |
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) |
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const ( |
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fileModeDefault os.FileMode = 0644 |
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) |
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type jsonlExport struct { |
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rows *sql.Rows |
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bar *progressbar.ProgressBar |
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file *os.File |
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exportPath string |
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columns []string |
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} |
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func NewJsonlExport(rows *sql.Rows, exportPath string, bar *progressbar.ProgressBar) exportdata.Export { |
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return &jsonlExport{rows: rows, exportPath: exportPath, bar: bar} |
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} |
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// Export rows in file |
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func (j *jsonlExport) Export() error { |
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if err := j.loadColumns(); err != nil { |
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return fmt.Errorf("failed to load columns: %w", err) |
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} |
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if err := j.openFile(); err != nil { |
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return fmt.Errorf("failed to open file: %w", err) |
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} |
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for j.rows.Next() { |
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_ = j.bar.Add(1) |
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if err := j.readAndAppendFile(); err != nil { |
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return fmt.Errorf("failed to read and append line in file: %w", err) |
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} |
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} |
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return nil |
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} |
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// Close execute in defer |
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func (j *jsonlExport) Close() error { |
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defer func(file *os.File) { |
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_ = file.Close() |
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}(j.file) |
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return nil |
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} |
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// readAndAppendFile read line and append in file |
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func (j *jsonlExport) readAndAppendFile() error { |
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values := make([]interface{}, len(j.columns)) |
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pointers := make([]interface{}, len(j.columns)) |
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for i := range values { |
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pointers[i] = &values[i] |
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} |
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if err := j.rows.Scan(pointers...); err != nil { |
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return fmt.Errorf("failed to load row: %w", err) |
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} |
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attr := map[string]interface{}{} |
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for i, c := range j.columns { |
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attr[c] = pointers[i] |
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} |
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payload, err := json.Marshal(attr) |
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if err != nil { |
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return fmt.Errorf("failed to serialize row: %w", err) |
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} |
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buffer := new(bytes.Buffer) |
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if err := json.Compact(buffer, payload); err != nil { |
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return fmt.Errorf("failed to compact payload: %w", err) |
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} |
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if _, err := j.file.WriteString(fmt.Sprintf("%s\n", buffer.String())); err != nil { |
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return fmt.Errorf("failed to write file %s: %w", j.exportPath, err) |
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} |
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return nil |
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} |
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// openFile open file |
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func (j *jsonlExport) openFile() error { |
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if _, err := os.Stat(j.exportPath); !os.IsNotExist(err) { |
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err := os.Remove(j.exportPath) |
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if err != nil { |
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return fmt.Errorf("failed to remove file: %w", err) |
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} |
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} |
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if err := os.MkdirAll(filepath.Dir(j.exportPath), os.ModePerm); err != nil { |
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return fmt.Errorf("failed to create path: %w", err) |
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} |
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file, err := os.OpenFile(j.exportPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, fileModeDefault) |
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if err != nil { |
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return fmt.Errorf("failed to open file %s: %w", j.exportPath, err) |
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} |
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j.file = file |
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return nil |
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} |
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// loadColumns load columns |
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func (j *jsonlExport) loadColumns() error { |
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columns, err := j.rows.Columns() |
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if err != nil { |
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return fmt.Errorf("failed to load columns: %w", err) |
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} |
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j.columns = columns |
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return nil |
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} |
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adrianolaselva /
csvql
