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importccl: add mysqloutfile converter
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| // Copyright 2018 The Cockroach Authors. | ||
| // | ||
| // Licensed as a CockroachDB Enterprise file under the Cockroach Community | ||
| // License (the "License"); you may not use this file except in compliance with | ||
| // the License. You may obtain a copy of the License at | ||
| // | ||
| // https://github.com/cockroachdb/cockroach/blob/master/licenses/CCL.txt | ||
|
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| package importccl | ||
|
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| import ( | ||
| "bufio" | ||
| "context" | ||
| "io" | ||
| "unicode" | ||
|
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| "github.com/pkg/errors" | ||
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| "github.com/cockroachdb/cockroach/pkg/roachpb" | ||
| "github.com/cockroachdb/cockroach/pkg/sql/sqlbase" | ||
| ) | ||
|
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| type mysqloutfileReader struct { | ||
| csvInputReader | ||
| opts roachpb.MySQLOutfileOptions | ||
| } | ||
|
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| var _ inputConverter = &mysqloutfileReader{} | ||
|
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| func newMysqloutfileReader( | ||
| kvCh chan kvBatch, | ||
| opts roachpb.MySQLOutfileOptions, | ||
| tableDesc *sqlbase.TableDescriptor, | ||
| expectedCols int, | ||
| ) *mysqloutfileReader { | ||
| return &mysqloutfileReader{ | ||
| csvInputReader: *newCSVInputReader(kvCh, roachpb.CSVOptions{}, tableDesc, expectedCols), | ||
| opts: opts, | ||
| } | ||
| } | ||
|
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| func (d *mysqloutfileReader) readFile( | ||
| ctx context.Context, | ||
| input io.Reader, | ||
| inputIdx int32, | ||
| inputName string, | ||
| progressFn func(finished bool) error, | ||
| ) error { | ||
|
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| var count int | ||
|
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| // The current row being read. | ||
| var row []string | ||
| // the current field being read. | ||
| var field []byte | ||
|
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| // If we have an escaping char defined, seeing it means the next char is to be | ||
| // treated as escaped -- usually that means literal but has some specific | ||
| // mappings defined as well. | ||
| var nextLiteral bool | ||
|
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| // If we have an enclosing char defined, seeing it begins reading a field -- | ||
| // which means we do not look for separators until we see the end of the field | ||
| // as indicated by the matching enclosing char. | ||
| var readingField bool | ||
|
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| reader := bufio.NewReaderSize(input, 1024*64) | ||
|
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| for { | ||
| c, w, err := reader.ReadRune() | ||
| finished := err == io.EOF | ||
|
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| // First check that if we're done and everything looks good. | ||
| if finished { | ||
| if nextLiteral { | ||
| return errors.New("unmatched literal") | ||
| } | ||
| if readingField { | ||
| return errors.New("unmatched field enclosure") | ||
| } | ||
| // flush the last row if we have one. | ||
| if len(row) > 0 { | ||
| d.csvInputReader.batch.r = append(d.csvInputReader.batch.r, row) | ||
| } | ||
| } | ||
|
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| // Check if we need to flush due to capacity or finished. | ||
| if finished || len(d.csvInputReader.batch.r) > d.csvInputReader.batchSize { | ||
| if err := d.csvInputReader.flushBatch(ctx, finished, progressFn); err != nil { | ||
| return err | ||
| } | ||
| d.csvInputReader.batch.rowOffset = count | ||
| } | ||
|
|
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| if finished { | ||
| break | ||
| } | ||
|
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| if err != nil { | ||
| return err | ||
| } | ||
| if c == unicode.ReplacementChar && w == 1 { | ||
| if err := reader.UnreadRune(); err != nil { | ||
| return err | ||
| } | ||
| raw, err := reader.ReadByte() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| field = append(field, raw) | ||
| continue | ||
| } | ||
|
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| // Do we need to check for escaping? | ||
| if d.opts.HasEscape { | ||
| if nextLiteral { | ||
| nextLiteral = false | ||
| // See https://dev.mysql.com/doc/refman/8.0/en/load-data.html. | ||
| switch c { | ||
| case '0': | ||
| field = append(field, byte(0)) | ||
| case 'b': | ||
| field = append(field, '\b') | ||
| case 'n': | ||
| field = append(field, '\n') | ||
| case 'r': | ||
| field = append(field, '\r') | ||
| case 't': | ||
| field = append(field, '\t') | ||
| case 'Z': | ||
| field = append(field, byte(26)) | ||
| case 'N': | ||
| field = append(field, '\\', 'N') | ||
| default: | ||
| field = append(field, string(c)...) | ||
| } | ||
| continue | ||
| } | ||
|
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| if c == d.opts.Escape { | ||
| nextLiteral = true | ||
| continue | ||
| } | ||
| } | ||
|
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| // If we have a defined enclose char, check if we're starting or stopping | ||
| // an enclosed field. Technically, the enclose char can be made mandatory, | ||
| // so potentially we could have a flag to enforce that, returning an error | ||
| // if it is missing, but we don't need to care for simply decoding. | ||
| if d.opts.Enclose != roachpb.MySQLOutfileOptions_Never && c == d.opts.Encloser { | ||
| readingField = !readingField | ||
| continue | ||
| } | ||
|
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| // Are we done with the field, or even the whole row? | ||
| if !readingField && (c == d.opts.FieldSeparator || c == d.opts.RowSeparator) { | ||
| row = append(row, string(field)) | ||
| field = field[:0] | ||
|
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| if c == d.opts.RowSeparator { | ||
| if expected := d.csvInputReader.expectedCols; expected != len(row) { | ||
| return errors.Errorf("row %d: expected %d columns, go %d: %#v", count+1, expected, len(row), row) | ||
| } | ||
| d.csvInputReader.batch.r = append(d.csvInputReader.batch.r, row) | ||
| count++ | ||
| row = make([]string, 0, len(row)) | ||
| } | ||
| continue | ||
| } | ||
|
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| field = append(field, string(c)...) | ||
| } | ||
|
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| return nil | ||
| } |
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