/
trace.go
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/
trace.go
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// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package grid
import (
"context"
"fmt"
"net/http"
"strings"
"time"
"github.com/minio/madmin-go/v3"
"github.com/minio/minio/internal/pubsub"
)
// TraceParamsKey allows to pass trace parameters to the request via context.
// This is only needed when un-typed requests are used.
// MSS, map[string]string types are preferred, but any struct with exported fields will work.
type TraceParamsKey struct{}
// traceRequests adds request tracing to the connection.
func (c *Connection) traceRequests(p *pubsub.PubSub[madmin.TraceInfo, madmin.TraceType]) {
c.trace = &tracer{
Publisher: p,
TraceType: madmin.TraceInternal,
Prefix: "grid",
Local: c.Local,
Remote: c.Remote,
Subroute: "",
}
}
// subroute adds a specific subroute to the request.
func (c *tracer) subroute(subroute string) *tracer {
if c == nil {
return nil
}
c2 := *c
c2.Subroute = subroute
return &c2
}
type tracer struct {
Publisher *pubsub.PubSub[madmin.TraceInfo, madmin.TraceType]
TraceType madmin.TraceType
Prefix string
Local string
Remote string
Subroute string
}
const (
httpScheme = "http://"
httpsScheme = "https://"
)
func (c *muxClient) traceRoundtrip(ctx context.Context, t *tracer, h HandlerID, req []byte) ([]byte, error) {
if t == nil || t.Publisher.NumSubscribers(t.TraceType) == 0 {
return c.roundtrip(h, req)
}
// Following trimming is needed for consistency between outputs with other internode traces.
local := strings.TrimPrefix(strings.TrimPrefix(t.Local, httpsScheme), httpScheme)
remote := strings.TrimPrefix(strings.TrimPrefix(t.Remote, httpsScheme), httpScheme)
start := time.Now()
body := bytesOrLength(req)
resp, err := c.roundtrip(h, req)
end := time.Now()
status := http.StatusOK
errString := ""
if err != nil {
errString = err.Error()
if IsRemoteErr(err) == nil {
status = http.StatusInternalServerError
} else {
status = http.StatusBadRequest
}
}
prefix := t.Prefix
if p := handlerPrefixes[h]; p != "" {
prefix = p
}
trace := madmin.TraceInfo{
TraceType: t.TraceType,
FuncName: prefix + "." + h.String(),
NodeName: remote,
Time: start,
Duration: end.Sub(start),
Path: t.Subroute,
Error: errString,
HTTP: &madmin.TraceHTTPStats{
ReqInfo: madmin.TraceRequestInfo{
Time: start,
Proto: "grid",
Method: "REQ",
Client: local,
Headers: nil,
Path: t.Subroute,
Body: []byte(body),
},
RespInfo: madmin.TraceResponseInfo{
Time: end,
Headers: nil,
StatusCode: status,
Body: []byte(bytesOrLength(resp)),
},
CallStats: madmin.TraceCallStats{
InputBytes: len(req),
OutputBytes: len(resp),
TimeToFirstByte: end.Sub(start),
},
},
}
// If the context contains a TraceParamsKey, add it to the trace path.
v := ctx.Value(TraceParamsKey{})
// Should match SingleHandler.Call checks.
switch typed := v.(type) {
case *MSS:
trace.Path += typed.ToQuery()
case map[string]string:
m := MSS(typed)
trace.Path += m.ToQuery()
case *URLValues:
trace.Path += typed.Values().Encode()
case *NoPayload, *Bytes:
trace.Path = fmt.Sprintf("%s?payload=%T", trace.Path, typed)
case string:
trace.Path = fmt.Sprintf("%s?%s", trace.Path, typed)
default:
}
trace.HTTP.ReqInfo.Path = trace.Path
t.Publisher.Publish(trace)
return resp, err
}