forked from go-openapi/runtime
/
bytestream.go
116 lines (100 loc) · 3.09 KB
/
bytestream.go
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// Copyright 2015 go-swagger maintainers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package runtime
import (
"bytes"
"encoding"
"errors"
"fmt"
"io"
"reflect"
"github.com/go-openapi/swag"
)
// ByteStreamConsumer creates a consmer for byte streams,
// takes a Writer/BinaryUnmarshaler interface or binary slice by reference,
// and reads from the provided reader
func ByteStreamConsumer() Consumer {
return ConsumerFunc(func(reader io.Reader, data interface{}) error {
if reader == nil {
return errors.New("ByteStreamConsumer requires a reader") // early exit
}
if wrtr, ok := data.(io.Writer); ok {
_, err := io.Copy(wrtr, reader)
return err
}
buf := new(bytes.Buffer)
_, err := buf.ReadFrom(reader)
if err != nil {
return err
}
b := buf.Bytes()
if bu, ok := data.(encoding.BinaryUnmarshaler); ok {
return bu.UnmarshalBinary(b)
}
if t := reflect.TypeOf(data); data != nil && t.Kind() == reflect.Ptr {
v := reflect.Indirect(reflect.ValueOf(data))
if t = v.Type(); t.Kind() == reflect.Slice && t.Elem().Kind() == reflect.Uint8 {
v.SetBytes(b)
return nil
}
}
return fmt.Errorf("%v (%T) is not supported by the ByteStreamConsumer, %s",
data, data, "can be resolved by supporting Writer/BinaryUnmarshaler interface")
})
}
// ByteStreamProducer creates a producer for byte streams,
// takes a Reader/BinaryMarshaler interface or binary slice,
// and writes to a writer (essentially a pipe)
func ByteStreamProducer() Producer {
return ProducerFunc(func(writer io.Writer, data interface{}) error {
if writer == nil {
return errors.New("ByteStreamProducer requires a writer") // early exit
}
if rdr, ok := data.(io.Reader); ok {
_, err := io.Copy(writer, rdr)
return err
}
if bm, ok := data.(encoding.BinaryMarshaler); ok {
bytes, err := bm.MarshalBinary()
if err != nil {
return err
}
_, err = writer.Write(bytes)
return err
}
if data != nil {
if e, ok := data.(error); ok {
_, err := writer.Write([]byte(e.Error()))
return err
}
}
if data != nil {
v := reflect.Indirect(reflect.ValueOf(data))
if t := v.Type(); t.Kind() == reflect.Slice && t.Elem().Kind() == reflect.Uint8 {
_, err := writer.Write(v.Bytes())
return err
}
if t := v.Type(); t.Kind() == reflect.Struct || t.Kind() == reflect.Slice {
b, err := swag.WriteJSON(data)
if err != nil {
return err
}
_, err = writer.Write(b)
return err
}
}
return fmt.Errorf("%v (%T) is not supported by the ByteStreamProducer, %s",
data, data, "can be resolved by supporting Reader/BinaryMarshaler interface")
})
}