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x-pack/filebeat/input/gcs: add support for CSV decoding (elastic#40979)
The test file txn.csv.gz was obtained from https://netskopepartnerlogfilebucket.s3.amazonaws.com/txn-1722875066329034-fe10b6a23cc643c4b282e6190de2352d.csv.gz
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| // or more contributor license agreements. Licensed under the Elastic License; | ||
| // you may not use this file except in compliance with the Elastic License. | ||
|
|
||
| package gcs | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| ) | ||
|
|
||
| // decoder is an interface for decoding data from an io.Reader. | ||
| type decoder interface { | ||
| // decode reads and decodes data from an io reader based on the codec type. | ||
| // It returns the decoded data and an error if the data cannot be decoded. | ||
| decode() ([]byte, error) | ||
| // next advances the decoder to the next data item and returns true if there is more data to be decoded. | ||
| next() bool | ||
| // close closes the decoder and releases any resources associated with it. | ||
| // It returns an error if the decoder cannot be closed. | ||
|
|
||
| // more returns whether there are more records to read. | ||
| more() bool | ||
|
|
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| close() error | ||
| } | ||
|
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| // valueDecoder is a decoder that can decode directly to a JSON serialisable value. | ||
| type valueDecoder interface { | ||
| decoder | ||
|
|
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| decodeValue() ([]byte, map[string]any, error) | ||
| } | ||
|
|
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| // newDecoder creates a new decoder based on the codec type. | ||
| // It returns a decoder type and an error if the codec type is not supported. | ||
| // If the reader config codec option is not set, it returns a nil decoder and nil error. | ||
| func newDecoder(cfg decoderConfig, r io.Reader) (decoder, error) { | ||
| switch { | ||
| case cfg.Codec == nil: | ||
| return nil, nil | ||
| case cfg.Codec.CSV != nil: | ||
| return newCSVDecoder(cfg, r) | ||
| default: | ||
| return nil, fmt.Errorf("unsupported config value: %v", cfg) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| // or more contributor license agreements. Licensed under the Elastic License; | ||
| // you may not use this file except in compliance with the Elastic License. | ||
|
|
||
| package gcs | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "unicode/utf8" | ||
| ) | ||
|
|
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| // decoderConfig contains the configuration options for instantiating a decoder. | ||
| type decoderConfig struct { | ||
| Codec *codecConfig `config:"codec"` | ||
| } | ||
|
|
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| // codecConfig contains the configuration options for different codecs used by a decoder. | ||
| type codecConfig struct { | ||
| CSV *csvCodecConfig `config:"csv"` | ||
| } | ||
|
|
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| // csvCodecConfig contains the configuration options for the CSV codec. | ||
| type csvCodecConfig struct { | ||
| Enabled bool `config:"enabled"` | ||
|
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| // Fields is the set of field names. If it is present | ||
| // it is used to specify the object names of returned | ||
| // values and the FieldsPerRecord field in the csv.Reader. | ||
| // Otherwise, names are obtained from the first | ||
| // line of the CSV data. | ||
| Fields []string `config:"fields_names"` | ||
|
|
||
| // The fields below have the same meaning as the | ||
| // fields of the same name in csv.Reader. | ||
| Comma *configRune `config:"comma"` | ||
| Comment configRune `config:"comment"` | ||
| LazyQuotes bool `config:"lazy_quotes"` | ||
| TrimLeadingSpace bool `config:"trim_leading_space"` | ||
| } | ||
|
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| type configRune rune | ||
|
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| func (r *configRune) Unpack(s string) error { | ||
| if s == "" { | ||
| return nil | ||
| } | ||
| n := utf8.RuneCountInString(s) | ||
| if n != 1 { | ||
| return fmt.Errorf("single character option given more than one character: %q", s) | ||
| } | ||
| _r, _ := utf8.DecodeRuneInString(s) | ||
| *r = configRune(_r) | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| // or more contributor license agreements. Licensed under the Elastic License; | ||
| // you may not use this file except in compliance with the Elastic License. | ||
|
|
||
| package gcs | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/csv" | ||
| "fmt" | ||
| "io" | ||
| "slices" | ||
| ) | ||
|
|
||
| // csvDecoder is a decoder for CSV data. | ||
| type csvDecoder struct { | ||
| r *csv.Reader | ||
|
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| header []string | ||
| current []string | ||
| coming []string | ||
|
|
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| err error | ||
| } | ||
|
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| // newCSVDecoder creates a new CSV decoder. | ||
| func newCSVDecoder(config decoderConfig, r io.Reader) (decoder, error) { | ||
| d := csvDecoder{r: csv.NewReader(r)} | ||
| d.r.ReuseRecord = true | ||
| if config.Codec.CSV.Comma != nil { | ||
| d.r.Comma = rune(*config.Codec.CSV.Comma) | ||
| } | ||
| d.r.Comment = rune(config.Codec.CSV.Comment) | ||
| d.r.LazyQuotes = config.Codec.CSV.LazyQuotes | ||
| d.r.TrimLeadingSpace = config.Codec.CSV.TrimLeadingSpace | ||
| if len(config.Codec.CSV.Fields) != 0 { | ||
| d.r.FieldsPerRecord = len(config.Codec.CSV.Fields) | ||
| d.header = config.Codec.CSV.Fields | ||
| } else { | ||
| h, err := d.r.Read() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| d.header = slices.Clone(h) | ||
| } | ||
| var err error | ||
| d.coming, err = d.r.Read() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| d.current = make([]string, 0, len(d.header)) | ||
| return &d, nil | ||
| } | ||
|
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| func (d *csvDecoder) more() bool { return len(d.coming) == len(d.header) } | ||
|
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| // next advances the decoder to the next data item and returns true if | ||
| // there is more data to be decoded. | ||
| func (d *csvDecoder) next() bool { | ||
| if !d.more() && d.err != nil { | ||
| return false | ||
| } | ||
| d.current = d.current[:len(d.header)] | ||
| copy(d.current, d.coming) | ||
| d.coming, d.err = d.r.Read() | ||
| if d.err == io.EOF { | ||
| d.coming = nil | ||
| } | ||
| return true | ||
| } | ||
|
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| // decode returns the JSON encoded value of the current CSV line. next must | ||
| // have been called before any calls to decode. | ||
| func (d *csvDecoder) decode() ([]byte, error) { | ||
| err := d.check() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var buf bytes.Buffer | ||
| buf.WriteByte('{') | ||
| for i, n := range d.header { | ||
| if i != 0 { | ||
| buf.WriteByte(',') | ||
| } | ||
| buf.WriteByte('"') | ||
| buf.WriteString(n) | ||
| buf.WriteString(`":"`) | ||
| buf.WriteString(d.current[i]) | ||
| buf.WriteByte('"') | ||
| } | ||
| buf.WriteByte('}') | ||
| d.current = d.current[:0] | ||
| return buf.Bytes(), nil | ||
| } | ||
|
|
||
| // decodeValue returns the value of the current CSV line interpreted as | ||
| // an object with fields based on the header held by the receiver. next must | ||
| // have been called before any calls to decode. | ||
| func (d *csvDecoder) decodeValue() ([]byte, map[string]any, error) { | ||
| err := d.check() | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| m := make(map[string]any, len(d.header)) | ||
| for i, n := range d.header { | ||
| m[n] = d.current[i] | ||
| } | ||
| d.current = d.current[:0] | ||
| b, err := d.decode() | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| return b, m, nil | ||
| } | ||
|
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| func (d *csvDecoder) check() error { | ||
| if d.err != nil { | ||
| if d.err == io.EOF && d.coming == nil { | ||
| return nil | ||
| } | ||
| return d.err | ||
| } | ||
| if len(d.current) == 0 { | ||
| return fmt.Errorf("decode called before next") | ||
| } | ||
| // By the time we are here, current must be the same | ||
| // length as header; if it was not read, it would be | ||
| // zero, but if it was, it must match by the contract | ||
| // of the csv.Reader. | ||
| return nil | ||
| } | ||
|
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| // close closes the csv decoder and releases the resources. | ||
| func (d *csvDecoder) close() error { | ||
| if d.err == io.EOF { | ||
| return nil | ||
| } | ||
| return d.err | ||
| } |
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