package csv import ( "bytes" "encoding/csv" "fmt" "strconv" "strings" "time" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/metric" ) type Parser struct { MetricName string HeaderRowCount int SkipRows int SkipColumns int Delimiter string Comment string TrimSpace bool ColumnNames []string ColumnTypes []string TagColumns []string MeasurementColumn string TimestampColumn string TimestampFormat string DefaultTags map[string]string TimeFunc func() time.Time } func (p *Parser) SetTimeFunc(fn metric.TimeFunc) { p.TimeFunc = fn } func (p *Parser) compile(r *bytes.Reader) (*csv.Reader, error) { csvReader := csv.NewReader(r) // ensures that the reader reads records of different lengths without an error csvReader.FieldsPerRecord = -1 if p.Delimiter != "" { csvReader.Comma = []rune(p.Delimiter)[0] } if p.Comment != "" { csvReader.Comment = []rune(p.Comment)[0] } return csvReader, nil } func (p *Parser) Parse(buf []byte) ([]telegraf.Metric, error) { r := bytes.NewReader(buf) csvReader, err := p.compile(r) if err != nil { return nil, err } // skip first rows for i := 0; i < p.SkipRows; i++ { csvReader.Read() } // if there is a header and nothing in DataColumns // set DataColumns to names extracted from the header headerNames := make([]string, 0) if len(p.ColumnNames) == 0 { for i := 0; i < p.HeaderRowCount; i++ { header, err := csvReader.Read() if err != nil { return nil, err } //concatenate header names for i := range header { name := header[i] if p.TrimSpace { name = strings.Trim(name, " ") } if len(headerNames) <= i { headerNames = append(headerNames, name) } else { headerNames[i] = headerNames[i] + name } } } p.ColumnNames = headerNames[p.SkipColumns:] } else { // if columns are named, just skip header rows for i := 0; i < p.HeaderRowCount; i++ { csvReader.Read() } } table, err := csvReader.ReadAll() if err != nil { return nil, err } metrics := make([]telegraf.Metric, 0) for _, record := range table { m, err := p.parseRecord(record) if err != nil { return metrics, err } metrics = append(metrics, m) } return metrics, nil } // ParseLine does not use any information in header and assumes DataColumns is set // it will also not skip any rows func (p *Parser) ParseLine(line string) (telegraf.Metric, error) { r := bytes.NewReader([]byte(line)) csvReader, err := p.compile(r) if err != nil { return nil, err } // if there is nothing in DataColumns, ParseLine will fail if len(p.ColumnNames) == 0 { return nil, fmt.Errorf("[parsers.csv] data columns must be specified") } record, err := csvReader.Read() if err != nil { return nil, err } m, err := p.parseRecord(record) if err != nil { return nil, err } return m, nil } func (p *Parser) parseRecord(record []string) (telegraf.Metric, error) { recordFields := make(map[string]interface{}) tags := make(map[string]string) // skip columns in record record = record[p.SkipColumns:] outer: for i, fieldName := range p.ColumnNames { if i < len(record) { value := record[i] if p.TrimSpace { value = strings.Trim(value, " ") } for _, tagName := range p.TagColumns { if tagName == fieldName { tags[tagName] = value continue outer } } // Try explicit conversion only when column types is defined. if len(p.ColumnTypes) > 0 { // Throw error if current column count exceeds defined types. if i >= len(p.ColumnTypes) { return nil, fmt.Errorf("column type: column count exceeded") } var val interface{} var err error switch p.ColumnTypes[i] { case "int": val, err = strconv.ParseInt(value, 10, 64) if err != nil { return nil, fmt.Errorf("column type: parse int error %s", err) } case "float": val, err = strconv.ParseFloat(value, 64) if err != nil { return nil, fmt.Errorf("column type: parse float error %s", err) } case "bool": val, err = strconv.ParseBool(value) if err != nil { return nil, fmt.Errorf("column type: parse bool error %s", err) } default: val = value } recordFields[fieldName] = val continue } // attempt type conversions if iValue, err := strconv.ParseInt(value, 10, 64); err == nil { recordFields[fieldName] = iValue } else if fValue, err := strconv.ParseFloat(value, 64); err == nil { recordFields[fieldName] = fValue } else if bValue, err := strconv.ParseBool(value); err == nil { recordFields[fieldName] = bValue } else { recordFields[fieldName] = value } } } // add default tags for k, v := range p.DefaultTags { tags[k] = v } // will default to plugin name measurementName := p.MetricName if recordFields[p.MeasurementColumn] != nil { measurementName = fmt.Sprintf("%v", recordFields[p.MeasurementColumn]) } metricTime := p.TimeFunc() if p.TimestampColumn != "" { if recordFields[p.TimestampColumn] == nil { return nil, fmt.Errorf("timestamp column: %v could not be found", p.TimestampColumn) } tStr := fmt.Sprintf("%v", recordFields[p.TimestampColumn]) if p.TimestampFormat == "" { return nil, fmt.Errorf("timestamp format must be specified") } var err error metricTime, err = time.Parse(p.TimestampFormat, tStr) if err != nil { return nil, err } } m, err := metric.New(measurementName, tags, recordFields, metricTime) if err != nil { return nil, err } return m, nil } func (p *Parser) SetDefaultTags(tags map[string]string) { p.DefaultTags = tags }