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https://github.com/open-telemetry/opentelemetry-go.git
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07d5f77749
* Rename plugin directory to instrumentation As per https://github.com/open-telemetry/opentelemetry-specification/pull/539 * Update package paths * Fix tracer names in othttp instrumentation
98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package othttp
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import (
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"context"
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"io"
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"net/http"
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"go.opentelemetry.io/otel/api/propagation"
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)
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var _ io.ReadCloser = &bodyWrapper{}
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// bodyWrapper wraps a http.Request.Body (an io.ReadCloser) to track the number
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// of bytes read and the last error
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type bodyWrapper struct {
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io.ReadCloser
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record func(n int64) // must not be nil
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read int64
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err error
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}
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func (w *bodyWrapper) Read(b []byte) (int, error) {
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n, err := w.ReadCloser.Read(b)
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n1 := int64(n)
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w.read += n1
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w.err = err
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w.record(n1)
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return n, err
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}
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func (w *bodyWrapper) Close() error {
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return w.ReadCloser.Close()
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}
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var _ http.ResponseWriter = &respWriterWrapper{}
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// respWriterWrapper wraps a http.ResponseWriter in order to track the number of
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// bytes written, the last error, and to catch the returned statusCode
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// TODO: The wrapped http.ResponseWriter doesn't implement any of the optional
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// types (http.Hijacker, http.Pusher, http.CloseNotifier, http.Flusher, etc)
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// that may be useful when using it in real life situations.
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type respWriterWrapper struct {
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http.ResponseWriter
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record func(n int64) // must not be nil
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// used to inject the header
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ctx context.Context
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props propagation.Propagators
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written int64
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statusCode int
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err error
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wroteHeader bool
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}
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func (w *respWriterWrapper) Header() http.Header {
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return w.ResponseWriter.Header()
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}
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func (w *respWriterWrapper) Write(p []byte) (int, error) {
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if !w.wroteHeader {
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w.WriteHeader(http.StatusOK)
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w.wroteHeader = true
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}
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n, err := w.ResponseWriter.Write(p)
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n1 := int64(n)
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w.record(n1)
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w.written += n1
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w.err = err
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return n, err
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}
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func (w *respWriterWrapper) WriteHeader(statusCode int) {
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if w.wroteHeader {
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return
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}
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w.wroteHeader = true
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w.statusCode = statusCode
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propagation.InjectHTTP(w.ctx, w.props, w.Header())
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w.ResponseWriter.WriteHeader(statusCode)
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}
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