| // 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" |
| ) |
| |
| func defaultCloser() error { return nil } |
| |
| type byteStreamOpt func(opts *byteStreamOpts) |
| |
| // ClosesStream when the bytestream consumer or producer is finished |
| func ClosesStream(opts *byteStreamOpts) { |
| opts.Close = true |
| } |
| |
| type byteStreamOpts struct { |
| Close bool |
| } |
| |
| // 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(opts ...byteStreamOpt) Consumer { |
| var vals byteStreamOpts |
| for _, opt := range opts { |
| opt(&vals) |
| } |
| |
| return ConsumerFunc(func(reader io.Reader, data interface{}) error { |
| if reader == nil { |
| return errors.New("ByteStreamConsumer requires a reader") // early exit |
| } |
| |
| close := defaultCloser |
| if vals.Close { |
| if cl, ok := reader.(io.Closer); ok { |
| close = cl.Close |
| } |
| } |
| defer close() |
| |
| 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(opts ...byteStreamOpt) Producer { |
| var vals byteStreamOpts |
| for _, opt := range opts { |
| opt(&vals) |
| } |
| return ProducerFunc(func(writer io.Writer, data interface{}) error { |
| if writer == nil { |
| return errors.New("ByteStreamProducer requires a writer") // early exit |
| } |
| close := defaultCloser |
| if vals.Close { |
| if cl, ok := writer.(io.Closer); ok { |
| close = cl.Close |
| } |
| } |
| defer close() |
| |
| 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 |
| } |
| |
| 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") |
| }) |
| } |