| // Copyright 2019, OpenCensus Authors |
| // |
| // 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 ochttp |
| |
| import ( |
| "io" |
| ) |
| |
| // wrappedBody returns a wrapped version of the original |
| // Body and only implements the same combination of additional |
| // interfaces as the original. |
| func wrappedBody(wrapper io.ReadCloser, body io.ReadCloser) io.ReadCloser { |
| var ( |
| wr, i0 = body.(io.Writer) |
| ) |
| switch { |
| case !i0: |
| return struct { |
| io.ReadCloser |
| }{wrapper} |
| |
| case i0: |
| return struct { |
| io.ReadCloser |
| io.Writer |
| }{wrapper, wr} |
| default: |
| return struct { |
| io.ReadCloser |
| }{wrapper} |
| } |
| } |