khenaidoo | ffe076b | 2019-01-15 16:08:08 -0500 | [diff] [blame^] | 1 | // Copyright 2017 The Prometheus Authors |
| 2 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 3 | // you may not use this file except in compliance with the License. |
| 4 | // You may obtain a copy of the License at |
| 5 | // |
| 6 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | // |
| 8 | // Unless required by applicable law or agreed to in writing, software |
| 9 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 10 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 11 | // See the License for the specific language governing permissions and |
| 12 | // limitations under the License. |
| 13 | |
| 14 | // +build go1.8 |
| 15 | |
| 16 | package promhttp |
| 17 | |
| 18 | import ( |
| 19 | "io" |
| 20 | "net/http" |
| 21 | ) |
| 22 | |
| 23 | type pusherDelegator struct{ *responseWriterDelegator } |
| 24 | |
| 25 | func (d pusherDelegator) Push(target string, opts *http.PushOptions) error { |
| 26 | return d.ResponseWriter.(http.Pusher).Push(target, opts) |
| 27 | } |
| 28 | |
| 29 | func init() { |
| 30 | pickDelegator[pusher] = func(d *responseWriterDelegator) delegator { // 16 |
| 31 | return pusherDelegator{d} |
| 32 | } |
| 33 | pickDelegator[pusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 17 |
| 34 | return struct { |
| 35 | *responseWriterDelegator |
| 36 | http.Pusher |
| 37 | http.CloseNotifier |
| 38 | }{d, pusherDelegator{d}, closeNotifierDelegator{d}} |
| 39 | } |
| 40 | pickDelegator[pusher+flusher] = func(d *responseWriterDelegator) delegator { // 18 |
| 41 | return struct { |
| 42 | *responseWriterDelegator |
| 43 | http.Pusher |
| 44 | http.Flusher |
| 45 | }{d, pusherDelegator{d}, flusherDelegator{d}} |
| 46 | } |
| 47 | pickDelegator[pusher+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 19 |
| 48 | return struct { |
| 49 | *responseWriterDelegator |
| 50 | http.Pusher |
| 51 | http.Flusher |
| 52 | http.CloseNotifier |
| 53 | }{d, pusherDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}} |
| 54 | } |
| 55 | pickDelegator[pusher+hijacker] = func(d *responseWriterDelegator) delegator { // 20 |
| 56 | return struct { |
| 57 | *responseWriterDelegator |
| 58 | http.Pusher |
| 59 | http.Hijacker |
| 60 | }{d, pusherDelegator{d}, hijackerDelegator{d}} |
| 61 | } |
| 62 | pickDelegator[pusher+hijacker+closeNotifier] = func(d *responseWriterDelegator) delegator { // 21 |
| 63 | return struct { |
| 64 | *responseWriterDelegator |
| 65 | http.Pusher |
| 66 | http.Hijacker |
| 67 | http.CloseNotifier |
| 68 | }{d, pusherDelegator{d}, hijackerDelegator{d}, closeNotifierDelegator{d}} |
| 69 | } |
| 70 | pickDelegator[pusher+hijacker+flusher] = func(d *responseWriterDelegator) delegator { // 22 |
| 71 | return struct { |
| 72 | *responseWriterDelegator |
| 73 | http.Pusher |
| 74 | http.Hijacker |
| 75 | http.Flusher |
| 76 | }{d, pusherDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}} |
| 77 | } |
| 78 | pickDelegator[pusher+hijacker+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { //23 |
| 79 | return struct { |
| 80 | *responseWriterDelegator |
| 81 | http.Pusher |
| 82 | http.Hijacker |
| 83 | http.Flusher |
| 84 | http.CloseNotifier |
| 85 | }{d, pusherDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}} |
| 86 | } |
| 87 | pickDelegator[pusher+readerFrom] = func(d *responseWriterDelegator) delegator { // 24 |
| 88 | return struct { |
| 89 | *responseWriterDelegator |
| 90 | http.Pusher |
| 91 | io.ReaderFrom |
| 92 | }{d, pusherDelegator{d}, readerFromDelegator{d}} |
| 93 | } |
| 94 | pickDelegator[pusher+readerFrom+closeNotifier] = func(d *responseWriterDelegator) delegator { // 25 |
| 95 | return struct { |
| 96 | *responseWriterDelegator |
| 97 | http.Pusher |
| 98 | io.ReaderFrom |
| 99 | http.CloseNotifier |
| 100 | }{d, pusherDelegator{d}, readerFromDelegator{d}, closeNotifierDelegator{d}} |
| 101 | } |
| 102 | pickDelegator[pusher+readerFrom+flusher] = func(d *responseWriterDelegator) delegator { // 26 |
| 103 | return struct { |
| 104 | *responseWriterDelegator |
| 105 | http.Pusher |
| 106 | io.ReaderFrom |
| 107 | http.Flusher |
| 108 | }{d, pusherDelegator{d}, readerFromDelegator{d}, flusherDelegator{d}} |
| 109 | } |
| 110 | pickDelegator[pusher+readerFrom+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 27 |
| 111 | return struct { |
| 112 | *responseWriterDelegator |
| 113 | http.Pusher |
| 114 | io.ReaderFrom |
| 115 | http.Flusher |
| 116 | http.CloseNotifier |
| 117 | }{d, pusherDelegator{d}, readerFromDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}} |
| 118 | } |
| 119 | pickDelegator[pusher+readerFrom+hijacker] = func(d *responseWriterDelegator) delegator { // 28 |
| 120 | return struct { |
| 121 | *responseWriterDelegator |
| 122 | http.Pusher |
| 123 | io.ReaderFrom |
| 124 | http.Hijacker |
| 125 | }{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}} |
| 126 | } |
| 127 | pickDelegator[pusher+readerFrom+hijacker+closeNotifier] = func(d *responseWriterDelegator) delegator { // 29 |
| 128 | return struct { |
| 129 | *responseWriterDelegator |
| 130 | http.Pusher |
| 131 | io.ReaderFrom |
| 132 | http.Hijacker |
| 133 | http.CloseNotifier |
| 134 | }{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, closeNotifierDelegator{d}} |
| 135 | } |
| 136 | pickDelegator[pusher+readerFrom+hijacker+flusher] = func(d *responseWriterDelegator) delegator { // 30 |
| 137 | return struct { |
| 138 | *responseWriterDelegator |
| 139 | http.Pusher |
| 140 | io.ReaderFrom |
| 141 | http.Hijacker |
| 142 | http.Flusher |
| 143 | }{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}} |
| 144 | } |
| 145 | pickDelegator[pusher+readerFrom+hijacker+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 31 |
| 146 | return struct { |
| 147 | *responseWriterDelegator |
| 148 | http.Pusher |
| 149 | io.ReaderFrom |
| 150 | http.Hijacker |
| 151 | http.Flusher |
| 152 | http.CloseNotifier |
| 153 | }{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}} |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | func newDelegator(w http.ResponseWriter, observeWriteHeaderFunc func(int)) delegator { |
| 158 | d := &responseWriterDelegator{ |
| 159 | ResponseWriter: w, |
| 160 | observeWriteHeader: observeWriteHeaderFunc, |
| 161 | } |
| 162 | |
| 163 | id := 0 |
| 164 | if _, ok := w.(http.CloseNotifier); ok { |
| 165 | id += closeNotifier |
| 166 | } |
| 167 | if _, ok := w.(http.Flusher); ok { |
| 168 | id += flusher |
| 169 | } |
| 170 | if _, ok := w.(http.Hijacker); ok { |
| 171 | id += hijacker |
| 172 | } |
| 173 | if _, ok := w.(io.ReaderFrom); ok { |
| 174 | id += readerFrom |
| 175 | } |
| 176 | if _, ok := w.(http.Pusher); ok { |
| 177 | id += pusher |
| 178 | } |
| 179 | |
| 180 | return pickDelegator[id](d) |
| 181 | } |