Created
February 24, 2020 08:10
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package transformer | |
import ( | |
"bufio" | |
"encoding/csv" | |
"encoding/json" | |
"fmt" | |
"io" | |
"os" | |
) | |
type Column struct { | |
Name string | |
Order int | |
Type string | |
} | |
// CSV2JSONL from CSV to Newline delimited JSON | |
func CSV2JSONL(skipRows int, columns []Column, outJSONFile string, inCSVFiles ...string) error { | |
writeFile, err := os.Create(outJSONFile) | |
if err != nil { | |
return fmt.Errorf("write file open err: %v", err) | |
} | |
w := bufio.NewWriter(writeFile) | |
defer w.Flush() | |
for _, readFile := range inCSVFiles { | |
reader, err := os.Open(readFile) | |
if err != nil { | |
return fmt.Errorf("read file open err: %v", err) | |
} | |
r := csv.NewReader(reader) | |
rowNum := 0 | |
for { | |
rowNum++ | |
record, err := r.Read() | |
if err == io.EOF { | |
break // EOF | |
} | |
if err != nil { | |
return fmt.Errorf("csv read err: %v", err) | |
} | |
if rowNum <= skipRows { | |
continue // skip | |
} | |
jsonMap := map[string]interface{}{} | |
for _, col := range columns { | |
idx := col.Order - 1 | |
if idx < 0 || idx >= len(record) { | |
return fmt.Errorf("record index err: %v", col) | |
} | |
key := col.Name | |
val := record[idx] | |
jsonMap[key] = val | |
} | |
// TODO(u110): meta情報としてファイル、行番号をのせるべきか検討 | |
// jsonMap["META_FILE"] = readFile | |
// jsonMap["META_FLINE"] = rowNum | |
jsonBuf, err := json.Marshal(jsonMap) | |
if err != nil { | |
return fmt.Errorf("json.Marshal err: %v", jsonMap) | |
} | |
i, err := fmt.Fprintln(w, string(jsonBuf)) | |
if err != nil { | |
return fmt.Errorf("Write ERROR: n: %v err: %v", i, err) | |
} | |
} | |
} | |
return nil | |
} |
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todo?