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|
package input
import (
"fmt"
"io"
"gopkg.in/yaml.v3"
"github.com/johnkerl/miller/v6/pkg/cli"
"github.com/johnkerl/miller/v6/pkg/lib"
"github.com/johnkerl/miller/v6/pkg/mlrval"
"github.com/johnkerl/miller/v6/pkg/types"
)
type RecordReaderYAML struct {
readerOptions *cli.TReaderOptions
recordsPerBatch int64
}
func NewRecordReaderYAML(
readerOptions *cli.TReaderOptions,
recordsPerBatch int64,
) (*RecordReaderYAML, error) {
return &RecordReaderYAML{
readerOptions: readerOptions,
recordsPerBatch: recordsPerBatch,
}, nil
}
func (reader *RecordReaderYAML) Read(
filenames []string,
context types.Context,
readerChannel chan<- []*types.RecordAndContext,
errorChannel chan error,
downstreamDoneChannel <-chan bool,
) {
if filenames != nil {
if len(filenames) == 0 {
handle, err := lib.OpenStdin(
reader.readerOptions.Prepipe,
reader.readerOptions.PrepipeIsRaw,
reader.readerOptions.FileInputEncoding,
)
if err != nil {
errorChannel <- err
} else {
reader.processHandle(handle, "(stdin)", &context, readerChannel, errorChannel, downstreamDoneChannel)
}
} else {
for _, filename := range filenames {
handle, err := lib.OpenFileForRead(
filename,
reader.readerOptions.Prepipe,
reader.readerOptions.PrepipeIsRaw,
reader.readerOptions.FileInputEncoding,
)
if err != nil {
errorChannel <- err
} else {
reader.processHandle(handle, filename, &context, readerChannel, errorChannel, downstreamDoneChannel)
handle.Close()
}
}
}
}
readerChannel <- types.NewEndOfStreamMarkerList(&context)
}
func (reader *RecordReaderYAML) processHandle(
handle io.Reader,
filename string,
context *types.Context,
readerChannel chan<- []*types.RecordAndContext,
errorChannel chan error,
downstreamDoneChannel <-chan bool,
) {
context.UpdateForStartOfFile(filename)
recordsPerBatch := reader.recordsPerBatch
decoder := yaml.NewDecoder(handle)
recordsAndContexts := make([]*types.RecordAndContext, 0, recordsPerBatch)
i := int64(0)
for {
i++
if i%recordsPerBatch == 0 {
select {
case <-downstreamDoneChannel:
goto flush
default:
}
}
mlrval, eof, err := mlrval.MlrvalDecodeFromYAML(decoder)
if eof {
break
}
if err != nil {
errorChannel <- err
return
}
if mlrval.IsMap() {
record := mlrval.GetMap()
if record == nil {
errorChannel <- fmt.Errorf("internal coding error in YAML record-reader")
return
}
context.UpdateForInputRecord()
recordsAndContexts = append(recordsAndContexts, types.NewRecordAndContext(record, context))
if int64(len(recordsAndContexts)) >= recordsPerBatch {
readerChannel <- recordsAndContexts
recordsAndContexts = make([]*types.RecordAndContext, 0, recordsPerBatch)
}
} else if mlrval.IsArray() {
records := mlrval.GetArray()
if records == nil {
errorChannel <- fmt.Errorf("internal coding error in YAML record-reader")
return
}
for _, mv := range records {
if !mv.IsMap() {
errorChannel <- fmt.Errorf(
"valid but unmillerable YAML: expected map (object); got %s",
mv.GetTypeName(),
)
return
}
record := mv.GetMap()
if record == nil {
errorChannel <- fmt.Errorf("internal coding error in YAML record-reader")
return
}
context.UpdateForInputRecord()
recordsAndContexts = append(recordsAndContexts, types.NewRecordAndContext(record, context))
if int64(len(recordsAndContexts)) >= recordsPerBatch {
readerChannel <- recordsAndContexts
recordsAndContexts = make([]*types.RecordAndContext, 0, recordsPerBatch)
}
}
} else {
errorChannel <- fmt.Errorf(
"valid but unmillerable YAML: expected map (object); got %s",
mlrval.GetTypeName(),
)
return
}
}
flush:
if len(recordsAndContexts) > 0 {
readerChannel <- recordsAndContexts
}
}
|
