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package csv |
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import ( |
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"adrianolaselva.github.io/csvql/pkg/filehandler" |
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"adrianolaselva.github.io/csvql/pkg/storage" |
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"bytes" |
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"database/sql" |
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"encoding/csv" |
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"fmt" |
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"github.com/schollz/progressbar/v3" |
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"io" |
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"os" |
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) |
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type csvHandler struct { |
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bar *progressbar.ProgressBar |
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storage storage.Storage |
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file *os.File |
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fileInput string |
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lines int |
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delimiter rune |
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} |
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func NewCsvHandler(fileInput string, delimiter rune, bar *progressbar.ProgressBar, storage storage.Storage) filehandler.FileHandler { |
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return &csvHandler{fileInput: fileInput, delimiter: delimiter, storage: storage, bar: bar} |
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} |
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// Import import data |
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func (c *csvHandler) Import() error { |
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if err := c.openFile(); err != nil { |
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return err |
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} |
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if err := c.loadTotalRows(); err != nil { |
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return err |
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} |
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if err := c.loadDataFromFile(); err != nil { |
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return err |
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} |
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return nil |
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} |
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// Query execute statements |
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func (c *csvHandler) Query(cmd string) (*sql.Rows, error) { |
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return c.storage.Query(cmd) |
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} |
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// Lines return total lines |
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func (c *csvHandler) Lines() int { |
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return c.lines |
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} |
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// Close execute in defer |
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func (c *csvHandler) Close() error { |
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defer func(storage storage.Storage) { |
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_ = storage.Close() |
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}(c.storage) |
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defer func(file *os.File) { |
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_ = file.Close() |
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}(c.file) |
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return nil |
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} |
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func (c *csvHandler) loadDataFromFile() error { |
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c.bar.ChangeMax(c.lines) |
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r := csv.NewReader(c.file) |
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r.Comma = c.delimiter |
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headers, err := r.Read() |
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if err != nil { |
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return fmt.Errorf("failed to load headers: %s", err) |
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} |
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if err := c.storage.SetColumns(headers).BuildStructure(); err != nil { |
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return fmt.Errorf("failed to load headers and build structure: %s", err) |
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} |
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line := 1 |
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for { |
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line++ |
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records, err := r.Read() |
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if err == io.EOF { |
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break |
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} |
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var values []any |
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for _, r := range records { |
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values = append(values, r) |
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} |
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_ = c.bar.Add(1) |
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if err := c.storage.InsertRow(values); err != nil { |
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return fmt.Errorf("failed to process row: %s", err) |
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} |
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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 (c *csvHandler) openFile() error { |
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f, err := os.Open(c.fileInput) |
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if err != nil { |
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return fmt.Errorf("failed to open file: %s", err) |
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} |
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c.file = f |
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return nil |
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} |
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// loadTotalRows load total rows in file |
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func (c *csvHandler) loadTotalRows() error { |
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r, err := os.Open(c.fileInput) |
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if err != nil { |
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return err |
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} |
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defer r.Close() |
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buf := make([]byte, 32*1024) |
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c.lines = 0 |
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lineSep := []byte{'\n'} |
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for { |
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r, err := r.Read(buf) |
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c.lines += bytes.Count(buf[:r], lineSep) |
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switch { |
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case err == io.EOF: |
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return nil |
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case err != nil: |
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return fmt.Errorf("failed to totalize rows: %s", err) |
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} |
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} |
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} |
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adrianolaselva /
csvql
