podman
169 строк · 4.1 Кб
1// Copyright 2015 go-swagger maintainers
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package runtime
16
17import (
18"bytes"
19"encoding"
20"errors"
21"fmt"
22"io"
23"reflect"
24
25"github.com/go-openapi/swag"
26)
27
28func defaultCloser() error { return nil }
29
30type byteStreamOpt func(opts *byteStreamOpts)
31
32// ClosesStream when the bytestream consumer or producer is finished
33func ClosesStream(opts *byteStreamOpts) {
34opts.Close = true
35}
36
37type byteStreamOpts struct {
38Close bool
39}
40
41// ByteStreamConsumer creates a consumer for byte streams,
42// takes a Writer/BinaryUnmarshaler interface or binary slice by reference,
43// and reads from the provided reader
44func ByteStreamConsumer(opts ...byteStreamOpt) Consumer {
45var vals byteStreamOpts
46for _, opt := range opts {
47opt(&vals)
48}
49
50return ConsumerFunc(func(reader io.Reader, data interface{}) error {
51if reader == nil {
52return errors.New("ByteStreamConsumer requires a reader") // early exit
53}
54
55close := defaultCloser
56if vals.Close {
57if cl, ok := reader.(io.Closer); ok {
58close = cl.Close
59}
60}
61//nolint:errcheck // closing a reader wouldn't fail.
62defer close()
63
64if wrtr, ok := data.(io.Writer); ok {
65_, err := io.Copy(wrtr, reader)
66return err
67}
68
69buf := new(bytes.Buffer)
70_, err := buf.ReadFrom(reader)
71if err != nil {
72return err
73}
74b := buf.Bytes()
75
76if bu, ok := data.(encoding.BinaryUnmarshaler); ok {
77return bu.UnmarshalBinary(b)
78}
79
80if data != nil {
81if str, ok := data.(*string); ok {
82*str = string(b)
83return nil
84}
85}
86
87if t := reflect.TypeOf(data); data != nil && t.Kind() == reflect.Ptr {
88v := reflect.Indirect(reflect.ValueOf(data))
89if t = v.Type(); t.Kind() == reflect.Slice && t.Elem().Kind() == reflect.Uint8 {
90v.SetBytes(b)
91return nil
92}
93}
94
95return fmt.Errorf("%v (%T) is not supported by the ByteStreamConsumer, %s",
96data, data, "can be resolved by supporting Writer/BinaryUnmarshaler interface")
97})
98}
99
100// ByteStreamProducer creates a producer for byte streams,
101// takes a Reader/BinaryMarshaler interface or binary slice,
102// and writes to a writer (essentially a pipe)
103func ByteStreamProducer(opts ...byteStreamOpt) Producer {
104var vals byteStreamOpts
105for _, opt := range opts {
106opt(&vals)
107}
108return ProducerFunc(func(writer io.Writer, data interface{}) error {
109if writer == nil {
110return errors.New("ByteStreamProducer requires a writer") // early exit
111}
112close := defaultCloser
113if vals.Close {
114if cl, ok := writer.(io.Closer); ok {
115close = cl.Close
116}
117}
118//nolint:errcheck // TODO: closing a writer would fail.
119defer close()
120
121if rc, ok := data.(io.ReadCloser); ok {
122defer rc.Close()
123}
124
125if rdr, ok := data.(io.Reader); ok {
126_, err := io.Copy(writer, rdr)
127return err
128}
129
130if bm, ok := data.(encoding.BinaryMarshaler); ok {
131bytes, err := bm.MarshalBinary()
132if err != nil {
133return err
134}
135
136_, err = writer.Write(bytes)
137return err
138}
139
140if data != nil {
141if str, ok := data.(string); ok {
142_, err := writer.Write([]byte(str))
143return err
144}
145
146if e, ok := data.(error); ok {
147_, err := writer.Write([]byte(e.Error()))
148return err
149}
150
151v := reflect.Indirect(reflect.ValueOf(data))
152if t := v.Type(); t.Kind() == reflect.Slice && t.Elem().Kind() == reflect.Uint8 {
153_, err := writer.Write(v.Bytes())
154return err
155}
156if t := v.Type(); t.Kind() == reflect.Struct || t.Kind() == reflect.Slice {
157b, err := swag.WriteJSON(data)
158if err != nil {
159return err
160}
161_, err = writer.Write(b)
162return err
163}
164}
165
166return fmt.Errorf("%v (%T) is not supported by the ByteStreamProducer, %s",
167data, data, "can be resolved by supporting Reader/BinaryMarshaler interface")
168})
169}
170