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body.go
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body.go
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package base
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"github.com/affix-io/dataset"
"github.com/affix-io/dataset/dsio"
"github.com/affix-io/qfs"
)
// ErrNoBodyToInline is an error returned when a dataset has no body for inlining
var ErrNoBodyToInline = fmt.Errorf("no body to inline")
// ReadBodyBytes grabs some or all of a dataset's body, writing an output in the desired format
func ReadBodyBytes(ds *dataset.Dataset, format dataset.DataFormat, fcfg dataset.FormatConfig, limit, offset int, all bool) (data []byte, err error) {
if ds == nil {
return nil, fmt.Errorf("can't load body from a nil dataset")
}
file := ds.BodyFile()
if file == nil {
err = fmt.Errorf("no body file to read")
return
}
st := &dataset.Structure{}
assign := &dataset.Structure{
Format: format.String(),
Schema: ds.Structure.Schema,
}
if fcfg != nil {
assign.FormatConfig = fcfg.Map()
}
st.Assign(ds.Structure, assign)
data, err = dsio.ConvertFile(file, ds.Structure, st, limit, offset, all)
if err != nil {
log.Debug(err.Error())
return nil, err
}
return data, nil
}
// GetBody takes returns the Body as a go-native structure,
// using limit, offset, and all parameters to determine what part of the Body to return
func GetBody(ds *dataset.Dataset, limit, offset int, all bool) (interface{}, error) {
if ds == nil {
return nil, fmt.Errorf("can't load body from a nil dataset")
}
file := ds.BodyFile()
if file == nil {
return nil, fmt.Errorf("no body file to read")
}
rr, err := dsio.NewEntryReader(ds.Structure, file)
if err != nil {
return nil, fmt.Errorf("error allocating data reader: %s", err)
}
if !all {
rr = &dsio.PagedReader{
Reader: rr,
Limit: limit,
Offset: offset,
}
}
return ReadEntries(rr)
}
// ReadEntries reads entries and returns them as a native go array or map
func ReadEntries(reader dsio.EntryReader) (interface{}, error) {
obj := make(map[string]interface{})
array := make([]interface{}, 0)
tlt, err := dsio.GetTopLevelType(reader.Structure())
if err != nil {
return nil, err
}
for i := 0; ; i++ {
val, err := reader.ReadEntry()
if err != nil {
if err.Error() == "EOF" {
break
}
return nil, err
}
if tlt == "object" {
obj[val.Key] = val.Value
} else {
array = append(array, val.Value)
}
}
if tlt == "object" {
return obj, nil
}
return array, nil
}
// InlineJSONBody reads the contents dataset.BodyFile() into a json.RawMessage,
// assigning the result to dataset.Body
func InlineJSONBody(ds *dataset.Dataset) error {
file := ds.BodyFile()
if file == nil {
return ErrNoBodyToInline
}
if ds.Structure.Format == dataset.JSONDataFormat.String() {
data, err := ioutil.ReadAll(file)
if err != nil {
return err
}
ds.Body = json.RawMessage(data)
return nil
}
in := ds.Structure
st := &dataset.Structure{}
st.Assign(in, &dataset.Structure{
Format: "json",
Schema: in.Schema,
})
data, err := dsio.ConvertFile(file, in, st, 0, 0, true)
if err != nil {
log.Errorf("converting body file to JSON: %s", err)
return fmt.Errorf("converting body file to JSON: %s", err)
}
ds.Body = json.RawMessage(data)
return nil
}
// ConvertBodyFormat rewrites a body from a source format to a destination format.
// TODO (b5): Combine this with ConvertBodyFile, update callers.
func ConvertBodyFormat(bodyFile qfs.File, fromSt, toSt *dataset.Structure) (qfs.File, error) {
// Reader for entries of the source body.
r, err := dsio.NewEntryReader(fromSt, bodyFile)
if err != nil {
return nil, err
}
// Writes entries to a new body.
buffer := &bytes.Buffer{}
w, err := dsio.NewEntryWriter(toSt, buffer)
if err != nil {
return nil, err
}
err = dsio.Copy(r, w)
if err != nil {
return nil, err
}
err = w.Close()
if err != nil {
return nil, err
}
return qfs.NewMemfileReader(toSt.BodyFilename(), buffer), nil
}