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Pull request 1797: AG-21072-querylog-conf-race

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Merge in DNS/adguard-home from AG-21072-querylog-conf-race to master

Squashed commit of the following:

commit fcb14353ee63f582986e18affebf5ed965c3bfc7
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Apr 3 15:04:03 2023 +0300

    querylog: imp code, docs

commit 9070bc1d4eee5efc5795466b2c2a40c6ab495e68
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Apr 3 13:58:56 2023 +0300

    querylog: fix races
This commit is contained in:
Ainar Garipov 2023-04-03 16:29:07 +03:00
parent 3575aa0570
commit 2a0d062947
6 changed files with 220 additions and 199 deletions
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187
internal/querylog/decode.go
View file

@ -166,86 +166,6 @@ var logEntryHandlers = map[string]logEntryHandler{
},
}
var resultHandlers = map[string]logEntryHandler{
"IsFiltered": func(t json.Token, ent *logEntry) error {
v, ok := t.(bool)
if !ok {
return nil
}
ent.Result.IsFiltered = v
return nil
},
"Rule": func(t json.Token, ent *logEntry) error {
s, ok := t.(string)
if !ok {
return nil
}
l := len(ent.Result.Rules)
if l == 0 {
ent.Result.Rules = []*filtering.ResultRule{{}}
l++
}
ent.Result.Rules[l-1].Text = s
return nil
},
"FilterID": func(t json.Token, ent *logEntry) error {
n, ok := t.(json.Number)
if !ok {
return nil
}
i, err := n.Int64()
if err != nil {
return err
}
l := len(ent.Result.Rules)
if l == 0 {
ent.Result.Rules = []*filtering.ResultRule{{}}
l++
}
ent.Result.Rules[l-1].FilterListID = i
return nil
},
"Reason": func(t json.Token, ent *logEntry) error {
v, ok := t.(json.Number)
if !ok {
return nil
}
i, err := v.Int64()
if err != nil {
return err
}
ent.Result.Reason = filtering.Reason(i)
return nil
},
"ServiceName": func(t json.Token, ent *logEntry) error {
s, ok := t.(string)
if !ok {
return nil
}
ent.Result.ServiceName = s
return nil
},
"CanonName": func(t json.Token, ent *logEntry) error {
s, ok := t.(string)
if !ok {
return nil
}
ent.Result.CanonName = s
return nil
},
}
func decodeResultRuleKey(key string, i int, dec *json.Decoder, ent *logEntry) {
var vToken json.Token
switch key {
@ -582,25 +502,11 @@ func decodeResult(dec *json.Decoder, ent *logEntry) {
return
}
switch key {
case "ReverseHosts":
decodeResultReverseHosts(dec, ent)
decHandler, ok := resultDecHandlers[key]
if ok {
decHandler(dec, ent)
continue
case "IPList":
decodeResultIPList(dec, ent)
continue
case "Rules":
decodeResultRules(dec, ent)
continue
case "DNSRewriteResult":
decodeResultDNSRewriteResult(dec, ent)
continue
default:
// Go on.
}
handler, ok := resultHandlers[key]
@ -621,6 +527,93 @@ func decodeResult(dec *json.Decoder, ent *logEntry) {
}
}
var resultHandlers = map[string]logEntryHandler{
"IsFiltered": func(t json.Token, ent *logEntry) error {
v, ok := t.(bool)
if !ok {
return nil
}
ent.Result.IsFiltered = v
return nil
},
"Rule": func(t json.Token, ent *logEntry) error {
s, ok := t.(string)
if !ok {
return nil
}
l := len(ent.Result.Rules)
if l == 0 {
ent.Result.Rules = []*filtering.ResultRule{{}}
l++
}
ent.Result.Rules[l-1].Text = s
return nil
},
"FilterID": func(t json.Token, ent *logEntry) error {
n, ok := t.(json.Number)
if !ok {
return nil
}
i, err := n.Int64()
if err != nil {
return err
}
l := len(ent.Result.Rules)
if l == 0 {
ent.Result.Rules = []*filtering.ResultRule{{}}
l++
}
ent.Result.Rules[l-1].FilterListID = i
return nil
},
"Reason": func(t json.Token, ent *logEntry) error {
v, ok := t.(json.Number)
if !ok {
return nil
}
i, err := v.Int64()
if err != nil {
return err
}
ent.Result.Reason = filtering.Reason(i)
return nil
},
"ServiceName": func(t json.Token, ent *logEntry) error {
s, ok := t.(string)
if !ok {
return nil
}
ent.Result.ServiceName = s
return nil
},
"CanonName": func(t json.Token, ent *logEntry) error {
s, ok := t.(string)
if !ok {
return nil
}
ent.Result.CanonName = s
return nil
},
}
var resultDecHandlers = map[string]func(dec *json.Decoder, ent *logEntry){
"ReverseHosts": decodeResultReverseHosts,
"IPList": decodeResultIPList,
"Rules": decodeResultRules,
"DNSRewriteResult": decodeResultDNSRewriteResult,
}
func decodeLogEntry(ent *logEntry, str string) {
dec := json.NewDecoder(strings.NewReader(str))
dec.UseNumber()

70
internal/querylog/entry.go Normal file
View file

@ -0,0 +1,70 @@
package querylog
import (
"net"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/filtering"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/miekg/dns"
)
// logEntry represents a single entry in the file.
type logEntry struct {
// client is the found client information, if any.
client *Client
Time time.Time `json:"T"`
QHost string `json:"QH"`
QType string `json:"QT"`
QClass string `json:"QC"`
ReqECS string `json:"ECS,omitempty"`
ClientID string `json:"CID,omitempty"`
ClientProto ClientProto `json:"CP"`
Upstream string `json:",omitempty"`
Answer []byte `json:",omitempty"`
OrigAnswer []byte `json:",omitempty"`
IP net.IP `json:"IP"`
Result filtering.Result
Elapsed time.Duration
Cached bool `json:",omitempty"`
AuthenticatedData bool `json:"AD,omitempty"`
}
// shallowClone returns a shallow clone of e.
func (e *logEntry) shallowClone() (clone *logEntry) {
cloneVal := *e
return &cloneVal
}
// addResponse adds data from resp to e.Answer if resp is not nil. If isOrig is
// true, addResponse sets the e.OrigAnswer field instead of e.Answer. Any
// errors are logged.
func (e *logEntry) addResponse(resp *dns.Msg, isOrig bool) {
if resp == nil {
return
}
var err error
if isOrig {
e.Answer, err = resp.Pack()
err = errors.Annotate(err, "packing answer: %w")
} else {
e.OrigAnswer, err = resp.Pack()
err = errors.Annotate(err, "packing orig answer: %w")
}
if err != nil {
log.Error("querylog: %s", err)
}
}

112
internal/querylog/qlog.go
View file

@ -3,7 +3,6 @@ package querylog
import (
"fmt"
"net"
"os"
"strings"
"sync"
@ -13,6 +12,7 @@ import (
"github.com/AdguardTeam/AdGuardHome/internal/filtering"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/stringutil"
"github.com/AdguardTeam/golibs/timeutil"
"github.com/miekg/dns"
)
@ -74,52 +74,24 @@ func NewClientProto(s string) (cp ClientProto, err error) {
}
}
// logEntry - represents a single log entry
type logEntry struct {
// client is the found client information, if any.
client *Client
Time time.Time `json:"T"`
QHost string `json:"QH"`
QType string `json:"QT"`
QClass string `json:"QC"`
ReqECS string `json:"ECS,omitempty"`
ClientID string `json:"CID,omitempty"`
ClientProto ClientProto `json:"CP"`
Answer []byte `json:",omitempty"` // sometimes empty answers happen like binerdunt.top or rev2.globalrootservers.net
OrigAnswer []byte `json:",omitempty"`
Result filtering.Result
Upstream string `json:",omitempty"`
IP net.IP `json:"IP"`
Elapsed time.Duration
Cached bool `json:",omitempty"`
AuthenticatedData bool `json:"AD,omitempty"`
}
// shallowClone returns a shallow clone of e.
func (e *logEntry) shallowClone() (clone *logEntry) {
cloneVal := *e
return &cloneVal
}
func (l *queryLog) Start() {
if l.conf.HTTPRegister != nil {
l.initWeb()
}
go l.periodicRotate()
}
func (l *queryLog) Close() {
_ = l.flushLogBuffer(true)
l.confMu.RLock()
defer l.confMu.RUnlock()
if l.conf.FileEnabled {
err := l.flushLogBuffer()
if err != nil {
log.Error("querylog: closing: %s", err)
}
}
}
func checkInterval(ivl time.Duration) (ok bool) {
@ -150,7 +122,13 @@ func validateIvl(ivl time.Duration) (err error) {
}
func (l *queryLog) WriteDiskConfig(c *Config) {
l.confMu.RLock()
defer l.confMu.RUnlock()
*c = *l.conf
// TODO(a.garipov): Add stringutil.Set.Clone.
c.Ignored = stringutil.NewSet(l.conf.Ignored.Values()...)
}
// Clear memory buffer and remove log files
@ -181,7 +159,17 @@ func (l *queryLog) clear() {
}
func (l *queryLog) Add(params *AddParams) {
if !l.conf.Enabled {
var isEnabled, fileIsEnabled bool
var memSize uint32
func() {
l.confMu.RLock()
defer l.confMu.RUnlock()
isEnabled, fileIsEnabled = l.conf.Enabled, l.conf.FileEnabled
memSize = l.conf.MemSize
}()
if !isEnabled {
return
}
@ -198,7 +186,7 @@ func (l *queryLog) Add(params *AddParams) {
now := time.Now()
q := params.Question.Question[0]
entry := logEntry{
entry := &logEntry{
Time: now,
QHost: strings.ToLower(q.Name[:len(q.Name)-1]),
@ -223,39 +211,18 @@ func (l *queryLog) Add(params *AddParams) {
entry.ReqECS = params.ReqECS.String()
}
if params.Answer != nil {
var a []byte
a, err = params.Answer.Pack()
if err != nil {
log.Error("querylog: Answer.Pack(): %s", err)
return
}
entry.Answer = a
}
if params.OrigAnswer != nil {
var a []byte
a, err = params.OrigAnswer.Pack()
if err != nil {
log.Error("querylog: OrigAnswer.Pack(): %s", err)
return
}
entry.OrigAnswer = a
}
entry.addResponse(params.Answer, false)
entry.addResponse(params.OrigAnswer, true)
needFlush := false
func() {
l.bufferLock.Lock()
defer l.bufferLock.Unlock()
l.buffer = append(l.buffer, &entry)
l.buffer = append(l.buffer, entry)
if !l.conf.FileEnabled {
if len(l.buffer) > int(l.conf.MemSize) {
if !fileIsEnabled {
if len(l.buffer) > int(memSize) {
// Writing to file is disabled, so just remove the oldest entry
// from the slices.
//
@ -265,17 +232,19 @@ func (l *queryLog) Add(params *AddParams) {
l.buffer = l.buffer[1:]
}
} else if !l.flushPending {
needFlush = len(l.buffer) >= int(l.conf.MemSize)
needFlush = len(l.buffer) >= int(memSize)
if needFlush {
l.flushPending = true
}
}
}()
// if buffer needs to be flushed to disk, do it now
if needFlush {
go func() {
_ = l.flushLogBuffer(false)
flushErr := l.flushLogBuffer()
if flushErr != nil {
log.Error("querylog: flushing after adding: %s", err)
}
}()
}
}
@ -288,7 +257,8 @@ func (l *queryLog) ShouldLog(host string, _, _ uint16) bool {
return !l.isIgnored(host)
}
// isIgnored returns true if the host is in the Ignored list.
// isIgnored returns true if the host is in the ignored domains list. It
// assumes that l.confMu is locked for reading.
func (l *queryLog) isIgnored(host string) bool {
return l.conf.Ignored.Has(host)
}

8
internal/querylog/qlog_test.go
View file

@ -34,13 +34,13 @@ func TestQueryLog(t *testing.T) {
// Add disk entries.
addEntry(l, "example.org", net.IPv4(1, 1, 1, 1), net.IPv4(2, 2, 2, 1))
// Write to disk (first file).
require.NoError(t, l.flushLogBuffer(true))
require.NoError(t, l.flushLogBuffer())
// Start writing to the second file.
require.NoError(t, l.rotate())
// Add disk entries.
addEntry(l, "example.org", net.IPv4(1, 1, 1, 2), net.IPv4(2, 2, 2, 2))
// Write to disk.
require.NoError(t, l.flushLogBuffer(true))
require.NoError(t, l.flushLogBuffer())
// Add memory entries.
addEntry(l, "test.example.org", net.IPv4(1, 1, 1, 3), net.IPv4(2, 2, 2, 3))
addEntry(l, "example.com", net.IPv4(1, 1, 1, 4), net.IPv4(2, 2, 2, 4))
@ -144,7 +144,7 @@ func TestQueryLogOffsetLimit(t *testing.T) {
addEntry(l, secondPageDomain, net.IPv4(1, 1, 1, 1), net.IPv4(2, 2, 2, 1))
}
// Write them to the first file.
require.NoError(t, l.flushLogBuffer(true))
require.NoError(t, l.flushLogBuffer())
// Add more to the in-memory part of log.
for i := 0; i < entNum; i++ {
addEntry(l, firstPageDomain, net.IPv4(1, 1, 1, 1), net.IPv4(2, 2, 2, 1))
@ -216,7 +216,7 @@ func TestQueryLogMaxFileScanEntries(t *testing.T) {
addEntry(l, "example.org", net.IPv4(1, 1, 1, 1), net.IPv4(2, 2, 2, 1))
}
// Write them to disk.
require.NoError(t, l.flushLogBuffer(true))
require.NoError(t, l.flushLogBuffer())
params := newSearchParams()

30
internal/querylog/querylogfile.go
View file

@ -13,40 +13,23 @@ import (
// flushLogBuffer flushes the current buffer to file and resets the current
// buffer.
func (l *queryLog) flushLogBuffer(fullFlush bool) (err error) {
if !l.conf.FileEnabled {
return nil
}
func (l *queryLog) flushLogBuffer() (err error) {
l.fileFlushLock.Lock()
defer l.fileFlushLock.Unlock()
// Flush the remainder to file.
var flushBuffer []*logEntry
needFlush := fullFlush
func() {
l.bufferLock.Lock()
defer l.bufferLock.Unlock()
needFlush = needFlush || len(l.buffer) >= int(l.conf.MemSize)
if needFlush {
flushBuffer = l.buffer
l.buffer = nil
l.flushPending = false
}
}()
if !needFlush {
return nil
}
err = l.flushToFile(flushBuffer)
if err != nil {
log.Error("querylog: writing to file: %s", err)
return err
}
return nil
return errors.Annotate(err, "writing to file: %w")
}
// flushToFile saves the specified log entries to the query log file
@ -167,9 +150,14 @@ func (l *queryLog) periodicRotate() {
// checkAndRotate rotates log files if those are older than the specified
// rotation interval.
func (l *queryLog) checkAndRotate() {
var rotationIvl time.Duration
func() {
l.confMu.RLock()
defer l.confMu.RUnlock()
rotationIvl = l.conf.RotationIvl
}()
oldest, err := l.readFileFirstTimeValue()
if err != nil && !errors.Is(err, os.ErrNotExist) {
log.Error("querylog: reading oldest record for rotation: %s", err)
@ -177,11 +165,11 @@ func (l *queryLog) checkAndRotate() {
return
}
if rot, now := oldest.Add(l.conf.RotationIvl), time.Now(); rot.After(now) {
if rotTime, now := oldest.Add(rotationIvl), time.Now(); rotTime.After(now) {
log.Debug(
"querylog: %s <= %s, not rotating",
now.Format(time.RFC3339),
rot.Format(time.RFC3339),
rotTime.Format(time.RFC3339),
)
return

2
scripts/make/go-lint.sh
View file

@ -161,10 +161,10 @@ run_linter "$GO" vet ./...
run_linter govulncheck ./...
# Apply more lax standards to the code we haven't properly refactored yet.
run_linter gocyclo --over 14 ./internal/querylog/
run_linter gocyclo --over 13\
./internal/dhcpd\
./internal/home/\
./internal/querylog/\
;
# Apply the normal standards to new or somewhat refactored code.