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// Copyright 2018, 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 (
"crypto/tls"
"net/http"
"net/http/httptrace"
"strings"
"go.opencensus.io/trace"
)
type spanAnnotator struct {
sp *trace.Span
}
// NewSpanAnnotator returns a httptrace.ClientTrace which annotates all emitted
// httptrace events on the provided Span.
func NewSpanAnnotator(_ *http.Request, s *trace.Span) *httptrace.ClientTrace {
sa := spanAnnotator{sp: s}
return &httptrace.ClientTrace{
GetConn: sa.getConn,
GotConn: sa.gotConn,
PutIdleConn: sa.putIdleConn,
GotFirstResponseByte: sa.gotFirstResponseByte,
Got100Continue: sa.got100Continue,
DNSStart: sa.dnsStart,
DNSDone: sa.dnsDone,
ConnectStart: sa.connectStart,
ConnectDone: sa.connectDone,
TLSHandshakeStart: sa.tlsHandshakeStart,
TLSHandshakeDone: sa.tlsHandshakeDone,
WroteHeaders: sa.wroteHeaders,
Wait100Continue: sa.wait100Continue,
WroteRequest: sa.wroteRequest,
}
}
func (s spanAnnotator) getConn(hostPort string) {
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.get_connection.host_port", hostPort),
}
s.sp.Annotate(attrs, "GetConn")
}
func (s spanAnnotator) gotConn(info httptrace.GotConnInfo) {
attrs := []trace.Attribute{
trace.BoolAttribute("httptrace.got_connection.reused", info.Reused),
trace.BoolAttribute("httptrace.got_connection.was_idle", info.WasIdle),
}
if info.WasIdle {
attrs = append(attrs,
trace.StringAttribute("httptrace.got_connection.idle_time", info.IdleTime.String()))
}
s.sp.Annotate(attrs, "GotConn")
}
// PutIdleConn implements a httptrace.ClientTrace hook
func (s spanAnnotator) putIdleConn(err error) {
var attrs []trace.Attribute
if err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.put_idle_connection.error", err.Error()))
}
s.sp.Annotate(attrs, "PutIdleConn")
}
func (s spanAnnotator) gotFirstResponseByte() {
s.sp.Annotate(nil, "GotFirstResponseByte")
}
func (s spanAnnotator) got100Continue() {
s.sp.Annotate(nil, "Got100Continue")
}
func (s spanAnnotator) dnsStart(info httptrace.DNSStartInfo) {
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.dns_start.host", info.Host),
}
s.sp.Annotate(attrs, "DNSStart")
}
func (s spanAnnotator) dnsDone(info httptrace.DNSDoneInfo) {
var addrs []string
for _, addr := range info.Addrs {
addrs = append(addrs, addr.String())
}
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.dns_done.addrs", strings.Join(addrs, " , ")),
}
if info.Err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.dns_done.error", info.Err.Error()))
}
s.sp.Annotate(attrs, "DNSDone")
}
func (s spanAnnotator) connectStart(network, addr string) {
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.connect_start.network", network),
trace.StringAttribute("httptrace.connect_start.addr", addr),
}
s.sp.Annotate(attrs, "ConnectStart")
}
func (s spanAnnotator) connectDone(network, addr string, err error) {
attrs := []trace.Attribute{
trace.StringAttribute("httptrace.connect_done.network", network),
trace.StringAttribute("httptrace.connect_done.addr", addr),
}
if err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.connect_done.error", err.Error()))
}
s.sp.Annotate(attrs, "ConnectDone")
}
func (s spanAnnotator) tlsHandshakeStart() {
s.sp.Annotate(nil, "TLSHandshakeStart")
}
func (s spanAnnotator) tlsHandshakeDone(_ tls.ConnectionState, err error) {
var attrs []trace.Attribute
if err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.tls_handshake_done.error", err.Error()))
}
s.sp.Annotate(attrs, "TLSHandshakeDone")
}
func (s spanAnnotator) wroteHeaders() {
s.sp.Annotate(nil, "WroteHeaders")
}
func (s spanAnnotator) wait100Continue() {
s.sp.Annotate(nil, "Wait100Continue")
}
func (s spanAnnotator) wroteRequest(info httptrace.WroteRequestInfo) {
var attrs []trace.Attribute
if info.Err != nil {
attrs = append(attrs,
trace.StringAttribute("httptrace.wrote_request.error", info.Err.Error()))
}
s.sp.Annotate(attrs, "WroteRequest")
}
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