/
reflect.go
133 lines (110 loc) · 2.67 KB
/
reflect.go
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// Package reflect provides a logging layer for exchangers and client
package reflect
import (
"time"
"github.com/miekg/dns"
"darvaza.org/core"
"darvaza.org/slog"
"darvaza.org/resolver/pkg/exdns"
)
type reflectOptions struct {
Name string
ID string
Request *dns.Msg
Response *dns.Msg
Server string
RTT time.Duration
Err error
Extra map[string]any
Rename map[string]string
}
func doLog(l slog.Logger, level slog.LogLevel, opt reflectOptions) {
log := l.WithLevel(level)
if log.Enabled() {
msg, fields := opt.getFields()
log.WithFields(fields).Print(msg)
}
}
func (opt reflectOptions) setField(m slog.Fields, label string, value any) {
if opt.Rename != nil {
n, ok := opt.Rename[label]
switch {
case !ok:
// continue
case n == "":
// skip
return
default:
// rename
label = n
}
}
m[label] = value
}
func (opt reflectOptions) setNonZeroField(m slog.Fields, label string, value any) {
if !core.IsZero(value) {
opt.setField(m, label, value)
}
}
func (opt reflectOptions) getFields() (string, slog.Fields) {
var s string
var msg *dns.Msg
switch {
case opt.Err != nil, opt.Response != nil, opt.RTT != 0:
msg = opt.Response
s = "response"
case opt.Request != nil:
msg = opt.Request
s = "request"
default:
s = "void"
}
m := make(map[string]any)
for k, v := range opt.Extra {
m[k] = v
}
opt.addMsgFields(m, msg)
opt.addLayerFields(m)
return s, m
}
func (opt reflectOptions) addMsgFields(m slog.Fields, msg *dns.Msg) {
if msg != nil {
opt.setField(m, "compress", msg.Compress)
opt.addMsgHdrFields(m, &msg.MsgHdr)
opt.addQuestions(m, msg.Question)
opt.addAnswers(m, "answer", msg.Answer)
opt.addAnswers(m, "ns", msg.Ns)
opt.addAnswers(m, "extra", msg.Extra)
}
}
func (opt reflectOptions) addMsgHdrFields(m slog.Fields, hdr *dns.MsgHdr) {
// TODO: in parts
opt.setField(m, "header", exdns.CleanString(hdr))
}
func (opt reflectOptions) addQuestions(m slog.Fields, questions []dns.Question) {
if len(questions) > 0 {
var s []string
for _, q := range questions {
s = append(s, exdns.CleanString(&q))
}
opt.setField(m, "question", s)
}
}
func (opt reflectOptions) addAnswers(m slog.Fields, name string, answers []dns.RR) {
if len(answers) > 0 {
var s []string
for _, rr := range answers {
s = append(s, exdns.CleanString(rr))
}
opt.setField(m, name, s)
}
}
func (opt reflectOptions) addLayerFields(m slog.Fields) {
opt.setNonZeroField(m, "name", opt.Name)
opt.setNonZeroField(m, "tracing", opt.ID)
opt.setNonZeroField(m, "server", opt.Server)
opt.setNonZeroField(m, slog.ErrorFieldName, opt.Err)
if d := opt.RTT; d > 0 {
opt.setField(m, "rtt", d/time.Millisecond)
}
}