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from.go
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from.go
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package csv
import (
"context"
"io"
"io/ioutil"
"strings"
"github.com/influxdata/flux"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/csv"
"github.com/influxdata/flux/dependencies/filesystem"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/memory"
"github.com/influxdata/flux/plan"
"github.com/influxdata/flux/runtime"
)
const FromCSVKind = "fromCSV"
type FromCSVOpSpec struct {
CSV string `json:"csv"`
File string `json:"file"`
Mode string `json:"mode"`
}
const (
annotationMode = "annotations"
rawMode = "raw"
)
func init() {
fromCSVSignature := runtime.MustLookupBuiltinType("csv", "from")
runtime.RegisterPackageValue("csv", "from", flux.MustValue(flux.FunctionValue(FromCSVKind, createFromCSVOpSpec, fromCSVSignature)))
flux.RegisterOpSpec(FromCSVKind, newFromCSVOp)
plan.RegisterProcedureSpec(FromCSVKind, newFromCSVProcedure, FromCSVKind)
execute.RegisterSource(FromCSVKind, createFromCSVSource)
}
func createFromCSVOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
spec := new(FromCSVOpSpec)
if csv, ok, err := args.GetString("csv"); err != nil {
return nil, err
} else if ok {
spec.CSV = csv
}
if file, ok, err := args.GetString("file"); err != nil {
return nil, err
} else if ok {
spec.File = file
}
if spec.CSV == "" && spec.File == "" {
return nil, errors.New(codes.Invalid, "must provide csv raw text or filename")
}
if spec.CSV != "" && spec.File != "" {
return nil, errors.New(codes.Invalid, "must provide exactly one of the parameters csv or file")
}
if mode, ok, err := args.GetString("mode"); err != nil {
return nil, err
} else if ok {
spec.Mode = mode
} else {
// default to annotation mode
spec.Mode = annotationMode
}
return spec, nil
}
func newFromCSVOp() flux.OperationSpec {
return new(FromCSVOpSpec)
}
func (s *FromCSVOpSpec) Kind() flux.OperationKind {
return FromCSVKind
}
type FromCSVProcedureSpec struct {
plan.DefaultCost
CSV string
File string
Mode string
}
func newFromCSVProcedure(qs flux.OperationSpec, pa plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*FromCSVOpSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", qs)
}
return &FromCSVProcedureSpec{
CSV: spec.CSV,
File: spec.File,
Mode: spec.Mode,
}, nil
}
func (s *FromCSVProcedureSpec) Kind() plan.ProcedureKind {
return FromCSVKind
}
func (s *FromCSVProcedureSpec) Copy() plan.ProcedureSpec {
ns := new(FromCSVProcedureSpec)
ns.CSV = s.CSV
ns.File = s.File
ns.Mode = s.Mode
return ns
}
func createFromCSVSource(prSpec plan.ProcedureSpec, dsid execute.DatasetID, a execute.Administration) (execute.Source, error) {
spec, ok := prSpec.(*FromCSVProcedureSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", prSpec)
}
return CreateSource(spec, dsid, a)
}
func CreateSource(spec *FromCSVProcedureSpec, dsid execute.DatasetID, a execute.Administration) (execute.Source, error) {
var getDataStream func() (io.ReadCloser, error)
if spec.File != "" {
getDataStream = func() (io.ReadCloser, error) {
f, err := filesystem.OpenFile(a.Context(), spec.File)
if err != nil {
return nil, errors.Wrap(err, codes.Inherit, "csv.from() failed to read file")
}
return f, nil
}
} else { // if spec.File is empty then spec.CSV is not empty
getDataStream = func() (io.ReadCloser, error) {
return ioutil.NopCloser(strings.NewReader(spec.CSV)), nil
}
}
csvSource := CSVSource{
id: dsid,
getDataStream: getDataStream,
alloc: a.Allocator(),
mode: spec.Mode,
}
return &csvSource, nil
}
type CSVSource struct {
execute.ExecutionNode
id execute.DatasetID
getDataStream func() (io.ReadCloser, error)
ts []execute.Transformation
alloc *memory.Allocator
mode string
}
func (c *CSVSource) AddTransformation(t execute.Transformation) {
c.ts = append(c.ts, t)
}
func (c *CSVSource) Run(ctx context.Context) {
var err error
var max execute.Time
maxSet := false
for _, t := range c.ts {
// For each downstream transformation, instantiate a new result
// decoder. This way a table instance goes to one and only one
// transformation. Unlike other sources, tables from csv sources
// are not read-only. They contain mutable state and therefore
// cannot be shared among goroutines.
config := csv.ResultDecoderConfig{
Allocator: c.alloc,
Context: ctx,
}
switch c.mode {
case rawMode:
config.NoAnnotations = true
default:
}
decoder := csv.NewMultiResultDecoder(config)
var data io.ReadCloser
data, err = c.getDataStream()
if err != nil {
goto FINISH
}
// Many applications will add a UTF BOM (byte order mark) to the beginning of csv files
// We expect UTF8 encoded data so the byte order does not matter.
// Therefore we skip the BOM if it exists.
// See http://www.unicode.org/faq/utf_bom.html#BOM
rc := newSkipBOMReader(data)
results, decodeErr := decoder.Decode(rc)
defer results.Release()
if decodeErr != nil {
err = decodeErr
goto FINISH
}
if !results.More() {
err = results.Err()
goto FINISH
}
result := results.Next()
err = result.Tables().Do(func(tbl flux.Table) error {
err := t.Process(c.id, tbl)
if err != nil {
return err
}
if idx := execute.ColIdx(execute.DefaultStopColLabel, tbl.Key().Cols()); idx >= 0 {
if stop := tbl.Key().ValueTime(idx); !maxSet || stop > max {
max = stop
maxSet = true
}
}
return nil
})
if err != nil {
goto FINISH
}
if results.More() {
err = errors.New(
codes.FailedPrecondition,
"csv.from() can only parse 1 result",
)
goto FINISH
}
}
if maxSet {
for _, t := range c.ts {
if err = t.UpdateWatermark(c.id, max); err != nil {
goto FINISH
}
}
}
FINISH:
if err != nil {
err = errors.Wrap(err, codes.Inherit, "error in csv.from()")
}
for _, t := range c.ts {
t.Finish(c.id, err)
}
}
// skipBOMReader wraps an io.ReadCloser and skips the BOM,
// if it exists at the beginning of the stream.
type skipBOMReader struct {
io.ReadCloser
buf []byte
checked bool
}
func newSkipBOMReader(r io.ReadCloser) io.ReadCloser {
return &skipBOMReader{
ReadCloser: r,
// BOM is three bytes long
buf: []byte{0, 0, 0},
checked: false,
}
}
func (r *skipBOMReader) Read(p []byte) (n int, err error) {
if !r.checked {
r.checked = true
// Read at least 3 bytes if possible
// We do not use io.ReadFull or io.ReadAtLeast here as they
// change the semantics of how errors are reported..
total := 0
for total < len(r.buf) {
n, err := r.ReadCloser.Read(r.buf[total:])
total += n
if err != nil {
m := copy(p, r.buf[:total])
return m, err
}
}
if r.buf[0] == 0xef && r.buf[1] == 0xbb && r.buf[2] == 0xbf {
// Found the BOM, null the buffer so that we don't return those bytes
r.buf = nil
}
}
if len(r.buf) > 0 {
n := copy(p, r.buf)
r.buf = r.buf[n:]
return n, nil
}
return r.ReadCloser.Read(p)
}