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writer.go
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writer.go
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package floor
import (
"errors"
"fmt"
"io"
"os"
"reflect"
"time"
"github.com/gulshalla/parquet-go/floor/interfaces"
"github.com/gulshalla/parquet-go/parquetschema"
goparquet "github.com/gulshalla/parquet-go"
"github.com/gulshalla/parquet-go/parquet"
)
// NewWriter creates a new high-level writer for parquet.
func NewWriter(w *goparquet.FileWriter) *Writer {
return &Writer{
w: w,
}
}
// NewFileWriter creates a nigh high-level writer for parquet
// that writes to a particular file.
func NewFileWriter(file string, opts ...goparquet.FileWriterOption) (*Writer, error) {
f, err := os.OpenFile(file, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return nil, err
}
w := goparquet.NewFileWriter(f, opts...)
return &Writer{
w: w,
f: f,
}, nil
}
// Writer represents a high-level writer for parquet files.
type Writer struct {
w *goparquet.FileWriter
f io.Closer
}
// Write adds a new object to be written to the parquet file. If
// obj implements the floor.Marshaller object, then obj.(Marshaller).Marshal
// will be called to determine the data, otherwise reflection will be
// used.
func (w *Writer) Write(obj interface{}) error {
m, ok := obj.(interfaces.Marshaller)
if !ok {
m = &reflectMarshaller{obj: obj, schemaDef: w.w.GetSchemaDefinition()}
}
data := interfaces.NewMarshallObject(nil)
if err := m.MarshalParquet(data); err != nil {
return err
}
if err := w.w.AddData(data.GetData()); err != nil {
return err
}
return nil
}
type reflectMarshaller struct {
obj interface{}
schemaDef *parquetschema.SchemaDefinition
}
func (m *reflectMarshaller) MarshalParquet(record interfaces.MarshalObject) error {
return m.marshal(record, reflect.ValueOf(m.obj), m.schemaDef)
}
func (m *reflectMarshaller) marshal(record interfaces.MarshalObject, value reflect.Value, schemaDef *parquetschema.SchemaDefinition) error {
if err := m.decodeStruct(record, value, schemaDef); err != nil {
return err
}
return nil
}
func (m *reflectMarshaller) decodeStruct(record interfaces.MarshalObject, value reflect.Value, schemaDef *parquetschema.SchemaDefinition) error {
if value.Type().Kind() == reflect.Ptr {
if value.IsNil() {
return errors.New("object is nil")
}
value = value.Elem()
}
typ := value.Type()
if typ.Kind() != reflect.Struct {
return fmt.Errorf("object needs to be a struct or a *struct, it's a %v instead", typ)
}
numFields := typ.NumField()
for i := 0; i < numFields; i++ {
fieldValue := value.Field(i)
fieldName := fieldNameFunc(typ.Field(i))
subSchemaDef := schemaDef.SubSchema(fieldName)
field := record.AddField(fieldName)
err := m.decodeValue(field, fieldValue, subSchemaDef)
if err != nil {
return err
}
}
return nil
}
func (m *reflectMarshaller) decodeTimeValue(elem *parquet.SchemaElement, field interfaces.MarshalElement, value reflect.Value) error {
switch {
case elem.GetLogicalType().TIME.Unit.IsSetNANOS():
field.SetInt64(value.Interface().(Time).Nanoseconds())
case elem.GetLogicalType().TIME.Unit.IsSetMICROS():
field.SetInt64(value.Interface().(Time).Microseconds())
case elem.GetLogicalType().TIME.Unit.IsSetMILLIS():
field.SetInt32(value.Interface().(Time).Milliseconds())
default:
return errors.New("invalid TIME unit")
}
return nil
}
func (m *reflectMarshaller) decodeTimestampValue(elem *parquet.SchemaElement, field interfaces.MarshalElement, value reflect.Value) error {
var factor int64
switch {
case elem.GetLogicalType().TIMESTAMP.Unit.IsSetNANOS():
factor = 1
case elem.GetLogicalType().TIMESTAMP.Unit.IsSetMICROS():
factor = 1000
case elem.GetLogicalType().TIMESTAMP.Unit.IsSetMILLIS():
factor = 1000000
default:
return errors.New("invalid TIMESTAMP unit")
}
ts := value.Interface().(time.Time).UnixNano()
ts /= factor
field.SetInt64(ts)
return nil
}
func (m *reflectMarshaller) decodeValue(field interfaces.MarshalElement, value reflect.Value, schemaDef *parquetschema.SchemaDefinition) error {
if value.Kind() == reflect.Ptr {
if value.IsNil() {
return nil
}
value = value.Elem()
}
if value.Type().ConvertibleTo(reflect.TypeOf(Time{})) {
if elem := schemaDef.SchemaElement(); elem.LogicalType != nil && elem.GetLogicalType().IsSetTIME() {
return m.decodeTimeValue(elem, field, value)
}
}
if value.Type().ConvertibleTo(reflect.TypeOf(time.Time{})) {
if elem := schemaDef.SchemaElement(); elem.LogicalType != nil {
switch {
case elem.GetLogicalType().IsSetDATE():
days := int32(value.Interface().(time.Time).Sub(time.Unix(0, 0).UTC()).Hours() / 24)
field.SetInt32(days)
return nil
case elem.GetLogicalType().IsSetTIMESTAMP():
return m.decodeTimestampValue(elem, field, value)
}
}
}
switch value.Kind() {
case reflect.Bool:
field.SetBool(value.Bool())
return nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32:
field.SetInt32(int32(value.Int()))
return nil
case reflect.Int64:
field.SetInt64(value.Int())
return nil
case reflect.Uint, reflect.Uint8, reflect.Uint16:
field.SetInt32(int32(value.Uint()))
return nil
case reflect.Uint32, reflect.Uint64:
field.SetInt64(int64(value.Uint()))
return nil
case reflect.Float32:
field.SetFloat32(float32(value.Float()))
return nil
case reflect.Float64:
field.SetFloat64(value.Float())
return nil
case reflect.Array, reflect.Slice:
if value.Type().Elem().Kind() == reflect.Uint8 {
return m.decodeByteSliceOrArray(field, value, schemaDef)
}
return m.decodeSliceOrArray(field, value, schemaDef)
case reflect.Map:
return m.decodeMap(field, value, schemaDef)
case reflect.String:
field.SetByteArray([]byte(value.String()))
return nil
case reflect.Struct:
return m.decodeStruct(field.Group(), value, schemaDef)
default:
return fmt.Errorf("unsupported type %s", value.Type())
}
}
func (m *reflectMarshaller) decodeByteSliceOrArray(field interfaces.MarshalElement, value reflect.Value, schemaDef *parquetschema.SchemaDefinition) error {
if value.Kind() == reflect.Slice && value.IsNil() {
return nil
}
if elem := schemaDef.SchemaElement(); elem.LogicalType != nil && elem.GetLogicalType().IsSetUUID() {
if value.Len() != 16 {
return fmt.Errorf("field is annotated as UUID but length is %d", value.Len())
}
}
if value.Kind() == reflect.Slice {
field.SetByteArray(value.Bytes())
return nil
}
data := reflect.MakeSlice(reflect.TypeOf([]byte{}), value.Len(), value.Len())
reflect.Copy(data, value)
field.SetByteArray(data.Bytes())
return nil
}
func (m *reflectMarshaller) decodeSliceOrArray(field interfaces.MarshalElement, value reflect.Value, schemaDef *parquetschema.SchemaDefinition) error {
if value.Kind() == reflect.Slice && value.IsNil() {
return nil
}
if elem := schemaDef.SchemaElement(); elem.GetConvertedType() != parquet.ConvertedType_LIST {
return fmt.Errorf("decoding slice or array but schema element %s is not annotated as LIST", elem.GetName())
}
listSchemaDef := schemaDef.SubSchema("list")
elementSchemaDef := listSchemaDef.SubSchema("element")
list := field.List()
for i := 0; i < value.Len(); i++ {
if err := m.decodeValue(list.Add(), value.Index(i), elementSchemaDef); err != nil {
return err
}
}
return nil
}
func (m *reflectMarshaller) decodeMap(field interfaces.MarshalElement, value reflect.Value, schemaDef *parquetschema.SchemaDefinition) error {
if value.IsNil() {
return nil
}
if elem := schemaDef.SchemaElement(); elem.GetConvertedType() != parquet.ConvertedType_MAP {
return fmt.Errorf("decoding map but schema element %s is not annotated as MAP", elem.GetName())
}
keyValueSchemaDef := schemaDef.SubSchema("key_value")
keySchemaDef := keyValueSchemaDef.SubSchema("key")
valueSchemaDef := keyValueSchemaDef.SubSchema("value")
mapData := field.Map()
iter := value.MapRange()
for iter.Next() {
kvPair := mapData.Add()
if err := m.decodeValue(kvPair.Key(), iter.Key(), keySchemaDef); err != nil {
return err
}
if err := m.decodeValue(kvPair.Value(), iter.Value(), valueSchemaDef); err != nil {
return err
}
}
return nil
}
// Close flushes outstanding data and closes the underlying
// parquet writer.
func (w *Writer) Close() error {
if w.f != nil {
defer w.f.Close()
}
return w.w.Close()
}