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// Copyright 2024 Google LLC
//
// 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 metadata
import (
"bytes"
"context"
"encoding/json"
"fmt"
"log/slog"
"net/http"
"strings"
)
// Code below this point is copied from github.com/googleapis/gax-go/v2/internallog
// to avoid the dependency. The compute/metadata module is used by too many
// non-client library modules that can't justify the dependency.
// The handler returned if logging is not enabled.
type noOpHandler struct{}
func (h noOpHandler) Enabled(_ context.Context, _ slog.Level) bool {
return false
}
func (h noOpHandler) Handle(_ context.Context, _ slog.Record) error {
return nil
}
func (h noOpHandler) WithAttrs(_ []slog.Attr) slog.Handler {
return h
}
func (h noOpHandler) WithGroup(_ string) slog.Handler {
return h
}
// httpRequest returns a lazily evaluated [slog.LogValuer] for a
// [http.Request] and the associated body.
func httpRequest(req *http.Request, body []byte) slog.LogValuer {
return &request{
req: req,
payload: body,
}
}
type request struct {
req *http.Request
payload []byte
}
func (r *request) LogValue() slog.Value {
if r == nil || r.req == nil {
return slog.Value{}
}
var groupValueAttrs []slog.Attr
groupValueAttrs = append(groupValueAttrs, slog.String("method", r.req.Method))
groupValueAttrs = append(groupValueAttrs, slog.String("url", r.req.URL.String()))
var headerAttr []slog.Attr
for k, val := range r.req.Header {
headerAttr = append(headerAttr, slog.String(k, strings.Join(val, ",")))
}
if len(headerAttr) > 0 {
groupValueAttrs = append(groupValueAttrs, slog.Any("headers", headerAttr))
}
if len(r.payload) > 0 {
if attr, ok := processPayload(r.payload); ok {
groupValueAttrs = append(groupValueAttrs, attr)
}
}
return slog.GroupValue(groupValueAttrs...)
}
// httpResponse returns a lazily evaluated [slog.LogValuer] for a
// [http.Response] and the associated body.
func httpResponse(resp *http.Response, body []byte) slog.LogValuer {
return &response{
resp: resp,
payload: body,
}
}
type response struct {
resp *http.Response
payload []byte
}
func (r *response) LogValue() slog.Value {
if r == nil {
return slog.Value{}
}
var groupValueAttrs []slog.Attr
groupValueAttrs = append(groupValueAttrs, slog.String("status", fmt.Sprint(r.resp.StatusCode)))
var headerAttr []slog.Attr
for k, val := range r.resp.Header {
headerAttr = append(headerAttr, slog.String(k, strings.Join(val, ",")))
}
if len(headerAttr) > 0 {
groupValueAttrs = append(groupValueAttrs, slog.Any("headers", headerAttr))
}
if len(r.payload) > 0 {
if attr, ok := processPayload(r.payload); ok {
groupValueAttrs = append(groupValueAttrs, attr)
}
}
return slog.GroupValue(groupValueAttrs...)
}
func processPayload(payload []byte) (slog.Attr, bool) {
peekChar := payload[0]
if peekChar == '{' {
// JSON object
var m map[string]any
if err := json.Unmarshal(payload, &m); err == nil {
return slog.Any("payload", m), true
}
} else if peekChar == '[' {
// JSON array
var m []any
if err := json.Unmarshal(payload, &m); err == nil {
return slog.Any("payload", m), true
}
} else {
// Everything else
buf := &bytes.Buffer{}
if err := json.Compact(buf, payload); err != nil {
// Write raw payload incase of error
buf.Write(payload)
}
return slog.String("payload", buf.String()), true
}
return slog.Attr{}, false
}
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