commit e580b9e3984dd4bafa7c12532c92796ab63fdb90 · seiso.moe/alky

+2 -2

go.mod

···

       13
       13
        
       )

     

       14
       14
        
       

     

       15
       15
        
       require (

     

       16
       16
       -
       	github.com/ClickHouse/ch-go v0.65.1 // indirect

     

       16
       16
       +
       	github.com/ClickHouse/ch-go v0.66.0 // indirect

     

       17
       17
        
       	github.com/andybalholm/brotli v1.1.1 // indirect

     

       18
       18
        
       	github.com/davecgh/go-spew v1.1.1 // indirect

     

       19
       19
        
       	github.com/go-faster/city v1.0.1 // indirect

     
···

       27
       27
        
       	github.com/shopspring/decimal v1.4.0 // indirect

     

       28
       28
        
       	go.opentelemetry.io/otel v1.35.0 // indirect

     

       29
       29
        
       	go.opentelemetry.io/otel/trace v1.35.0 // indirect

     

       30
       30
       -
       	golang.org/x/sys v0.32.0 // indirect

     

       30
       30
       +
       	golang.org/x/sys v0.33.0 // indirect

     

       31
       31
        
       	gopkg.in/yaml.v3 v3.0.1 // indirect

     

       32
       32
        
       )

go.sum

···

       2
       2
        
       github.com/BurntSushi/toml v1.5.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=

     

       3
       3
        
       github.com/ClickHouse/ch-go v0.65.1 h1:SLuxmLl5Mjj44/XbINsK2HFvzqup0s6rwKLFH347ZhU=

     

       4
       4
        
       github.com/ClickHouse/ch-go v0.65.1/go.mod h1:bsodgURwmrkvkBe5jw1qnGDgyITsYErfONKAHn05nv4=

     

       5
       5
       +
       github.com/ClickHouse/ch-go v0.66.0 h1:hLslxxAVb2PHpbHr4n0d6aP8CEIpUYGMVT1Yj/Q5Img=

     

       6
       6
       +
       github.com/ClickHouse/ch-go v0.66.0/go.mod h1:noiHWyLMJAZ5wYuq3R/K0TcRhrNA8h7o1AqHX0klEhM=

     

       7
       7
       +
       github.com/ClickHouse/clickhouse-go v1.5.4 h1:cKjXeYLNWVJIx2J1K6H2CqyRmfwVJVY1OV1coaaFcI0=

     

       5
       8
        
       github.com/ClickHouse/clickhouse-go/v2 v2.34.0 h1:Y4rqkdrRHgExvC4o/NTbLdY5LFQ3LHS77/RNFxFX3Co=

     

       6
       9
        
       github.com/ClickHouse/clickhouse-go/v2 v2.34.0/go.mod h1:yioSINoRLVZkLyDzdMXPLRIqhDvel8iLBlwh6Iefso8=

     

       7
       10
        
       github.com/andybalholm/brotli v1.1.1 h1:PR2pgnyFznKEugtsUo0xLdDop5SKXd5Qf5ysW+7XdTA=

     
···

       87
       90
        
       golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

     

       88
       91
        
       golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=

     

       89
       92
        
       golang.org/x/sys v0.32.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=

     

       93
       93
       +
       golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=

     

       94
       94
       +
       golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=

     

       90
       95
        
       golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=

     

       91
       96
        
       golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

     

       92
       97
        
       golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=

-43

main.go

···

       8
       8
        
       	"os/signal"

     

       9
       9
        
       	"strings"

     

       10
       10
        
       	"syscall"

     

       11
       11
       -
       	"time"

     

       12
       11
        
       

     

       13
       12
        
       	"tangled.sh/seiso.moe/alky/pkg/config"

     

       14
       13
        
       	"tangled.sh/seiso.moe/alky/pkg/dns"

     
···

       49
       48
        
       	}

     

       50
       49
        
       	logger.Info("Root hints loaded", "count", len(rootServers), "path", cfg.Server.RootHintsFile)

     

       51
       50
        
       

     

       52
       52
       -
       	cache := dns.NewLRUCache(cfg.Cache.MaxItems, cfg.Cache.CleanupInterval.Duration, logger.With("component", "cache"))

     

       53
       53
       -
       	defer cache.Stop()

     

       54
       54
       -
       	logger.Info("DNS cache initialized")

     

       55
       55
       -
       

     

       56
       51
        
       	queryHandler := &dns.QueryHandler{

     

       57
       52
        
       		RootServers: rootServers,

     

       58
       53
        
       		Timeout:     cfg.Advanced.QueryTimeout.Duration,

     

       59
       59
       -
       		Cache:       cache,

     

       60
       54
        
       		Logger:      logger.With("component", "resolver"),

     

       61
       55
        
       	}

     

       62
       56
        
       

     

       63
       63
       -
       	go monitorCacheMetrics(cache, metricsClient, logger.With("component", "cache-monitor"))

     

       64
       64
       -
       

     

       65
       57
        
       	var currentHandler dns.Handler = queryHandler

     

       66
       58
        
       

     

       67
       59
        
       	if cfg.Ratelimit.Rate > 0 {

     
···

       93
       85
        
       	go func() {

     

       94
       86
        
       		sig := <-sigChan

     

       95
       87
        
       		logger.Info("Received signal, shutting down gracefully...", "signal", sig.String())

     

       96
       96
       -
       

     

       97
       97
       -
       		logger.Info("Stopping cache...")

     

       98
       98
       -
       		cache.Stop()

     

       99
       88
        
       

     

       100
       89
        
       		logger.Info("Closing metrics client...")

     

       101
       90
        
       		metricsClient.Close()

     
···

       118
       107
        
       	if err := s.ListenAndServe(); err != nil {

     

       119
       108
        
       		logger.Error("Failed to start server", "error", err)

     

       120
       109
        
       		os.Exit(1)

     

       121
       121
       -
       	}

     

       122
       122
       -
       }

     

       123
       123
       -
       

     

       124
       124
       -
       func monitorCacheMetrics(cache dns.Cache, metricsClient *metrics.ClickHouseMetrics, logger *slog.Logger) {

     

       125
       125
       -
       	interval := 1 * time.Minute

     

       126
       126
       -
       	logger.Info("Starting cache metrics monitoring", "interval", interval)

     

       127
       127
       -
       	ticker := time.NewTicker(interval)

     

       128
       128
       -
       	defer ticker.Stop()

     

       129
       129
       -
       

     

       130
       130
       -
       	for {

     

       131
       131
       -
       		select {

     

       132
       132
       -
       		case <-ticker.C:

     

       133
       133
       -
       			stats := cache.GetStats()

     

       134
       134
       -
       			logger.Debug("Recording cache metrics",

     

       135
       135
       -
       				"hits", stats.Hits.Load(),

     

       136
       136
       -
       				"misses", stats.Misses.Load(),

     

       137
       137
       -
       				"size", stats.Size.Load(),

     

       138
       138
       -
       				"evictions", stats.Evictions.Load(),

     

       139
       139
       -
       				"expired", stats.Expired.Load(),

     

       140
       140
       -
       				"pos_hits", stats.PositiveHits.Load(),

     

       141
       141
       -
       				"neg_hits", stats.NegativeHits.Load(),

     

       142
       142
       -
       			)

     

       143
       143
       -
       			metricsClient.RecordCacheStats(metrics.CacheMetric{

     

       144
       144
       -
       				Timestamp:    time.Now(),

     

       145
       145
       -
       				CacheHits:    stats.Hits.Load(),

     

       146
       146
       -
       				CacheMisses:  stats.Misses.Load(),

     

       147
       147
       -
       				NegativeHits: stats.NegativeHits.Load(),

     

       148
       148
       -
       				PositiveHits: stats.PositiveHits.Load(),

     

       149
       149
       -
       				Evictions:    stats.Evictions.Load() + stats.Expired.Load(),

     

       150
       150
       -
       				Size:         stats.Size.Load(),

     

       151
       151
       -
       			})

     

       152
       152
       -
       		}

     

       153
       110
        
       	}

     

       154
       111
        
       }

     

       155
       112

+2 -26

pkg/config/config.go

···

       3
       3
        
       import (

     

       4
       4
        
       	"fmt"

     

       5
       5
        
       	"os"

     

       6
       6
       +
       	"slices"

     

       6
       7
        
       	"strings"

     

       7
       8
        
       	"time"

     

       8
       9
        
       

     
···

       42
       43
        
       	WriteTimeout duration `toml:"write_timeout"`

     

       43
       44
        
       }

     

       44
       45
        
       

     

       45
       45
       -
       type CacheConfig struct {

     

       46
       46
       -
       	MaxItems        int      `toml:"max_items"`

     

       47
       47
       -
       	CleanupInterval duration `toml:"cleanup_interval"`

     

       48
       48
       -
       }

     

       49
       49
       -
       

     

       50
       46
        
       type Config struct {

     

       51
       47
        
       	Server    ServerConfig    `toml:"server"`

     

       52
       48
        
       	Logging   LoggingConfig   `toml:"logging"`

     

       53
       49
        
       	Ratelimit RatelimitConfig `toml:"ratelimit"`

     

       54
       50
        
       	Metrics   MetricsConfig   `toml:"metrics"`

     

       55
       55
       -
       	Cache     CacheConfig     `toml:"cache"`

     

       56
       51
        
       	Advanced  AdvancedConfig  `toml:"advanced"`

     

       57
       52
        
       }

     

       58
       53
        
       

     
···

       101
       96
        
       	cfg.Metrics.FlushInterval.Duration = 10 * time.Second

     

       102
       97
        
       	cfg.Metrics.RetentionPeriod.Duration = 30 * 24 * time.Hour

     

       103
       98
        
       

     

       104
       104
       -
       	cfg.Cache.MaxItems = 10000

     

       105
       105
       -
       	cfg.Cache.CleanupInterval.Duration = 5 * time.Minute

     

       106
       106
       -
       

     

       107
       99
        
       	cfg.Advanced.QueryTimeout.Duration = 5 * time.Second

     

       108
       100
        
       	cfg.Advanced.ReadTimeout.Duration = 2 * time.Second

     

       109
       101
        
       	cfg.Advanced.WriteTimeout.Duration = 2 * time.Second

     
···

       126
       118
        
       	}

     

       127
       119
        
       

     

       128
       120
        
       	validLevels := []string{"debug", "info", "warn", "error"}

     

       129
       129
       -
       	isValidLevel := false

     

       130
       130
       -
       	for _, level := range validLevels {

     

       131
       131
       -
       		if strings.ToLower(cfg.Logging.Level) == level {

     

       132
       132
       -
       			isValidLevel = true

     

       133
       133
       -
       			break

     

       134
       134
       -
       		}

     

       135
       135
       -
       	}

     

       136
       136
       -
       

     

       137
       137
       -
       	if !isValidLevel {

     

       121
       121
       +
       	if !slices.Contains(validLevels, cfg.Logging.Level) {

     

       138
       122
        
       		return cfg, fmt.Errorf("invalid logging level '%s', must be one of: %v", cfg.Logging.Level, validLevels)

     

       139
       139
       -
       	}

     

       140
       140
       -
       

     

       141
       141
       -
       	if cfg.Cache.MaxItems <= 0 {

     

       142
       142
       -
       		return cfg, fmt.Errorf("cache max_items must be positive")

     

       143
       143
       -
       	}

     

       144
       144
       -
       

     

       145
       145
       -
       	if cfg.Cache.CleanupInterval.Duration <= 0 {

     

       146
       146
       -
       		cfg.Cache.CleanupInterval.Duration = 5 * time.Minute

     

       147
       123
        
       	}

     

       148
       124
        
       

     

       149
       125
        
       	if cfg.Advanced.QueryTimeout.Duration <= 0 {

+62 -316

pkg/dns/resolve.go

···

       4
       4
        
       	"context"

     

       5
       5
        
       	"fmt"

     

       6
       6
        
       	"log/slog"

     

       7
       7
       -
       	"math/rand"

     

       8
       7
        
       	"net"

     

       9
       8
        
       	"strings"

     

       10
       9
        
       	"time"

     
···

       17
       16
        
       type QueryHandler struct {

     

       18
       17
        
       	RootServers []string

     

       19
       18
        
       	Timeout     time.Duration

     

       20
       20
       -
       	Cache       Cache

     

       21
       19
        
       	Logger      *slog.Logger

     

       22
       20
        
       }

     

       23
       21
        
       

     
···

       40
       38
        
       

     

       41
       39
        
       	msg := r.Message.CreateReply(r.Message)

     

       42
       40
        
       	msg.Header.RA = true

     

       43
       43
       -
       

     

       44
       44
       -
       	if h.Cache != nil {

     

       45
       45
       -
       		cacheKey := GenerateCacheKey(question)

     

       46
       46
       -
       		if entry, found := h.Cache.Get(cacheKey); found {

     

       47
       47
       -
       			h.Logger.Debug("cache hit", "question", question.QName, "type", question.QType)

     

       48
       48
       -
       

     

       49
       49
       -
       			r.Context = setCacheHit(r.Context)

     

       50
       50
       -
       

     

       51
       51
       -
       			msg.Header.RCode = entry.RCode

     

       52
       52
       -
       			msg.Answer = entry.Answer

     

       53
       53
       -
       			msg.Authority = entry.Authority

     

       54
       54
       -
       			msg.Additional = entry.Additional

     

       55
       55
       -
       			msg.Header.ANCount = uint16(len(msg.Answer))

     

       56
       56
       -
       			msg.Header.NSCount = uint16(len(msg.Authority))

     

       57
       57
       -
       			msg.Header.ARCount = uint16(len(msg.Additional))

     

       58
       58
       -
       

     

       59
       59
       -
       			w.WriteMsg(msg)

     

       60
       60
       -
       			return

     

       61
       61
       -
       		} else {

     

       62
       62
       -
       			r.Context = setCacheMiss(r.Context)

     

       63
       63
       -
       		}

     

       64
       64
       -
       	}

     

       65
       41
        
       

     

       66
       42
        
       	records, err := h.resolveQuestion(r.Context, question, h.RootServers)

     

       67
       43
        
       

     
···

       79
       55
        
       		msg = msg.SetRCode(magna.NOERROR)

     

       80
       56
        
       	}

     

       81
       57
        
       

     

       82
       82
       -
       	if h.Cache != nil {

     

       83
       83
       -
       		if err == nil || err == errNXDOMAIN {

     

       84
       84
       -
       			entry := CreateCacheEntry(question, msg)

     

       85
       85
       -
       			if entry != nil {

     

       86
       86
       -
       				h.Cache.Set(GenerateCacheKey(question), entry)

     

       87
       87
       -
       				h.Logger.Debug("cached response",

     

       88
       88
       -
       					"question", question.QName,

     

       89
       89
       -
       					"type", question.QType.String(),

     

       90
       90
       -
       					"negative", entry.IsNegative,

     

       91
       91
       -
       					"rcode", entry.RCode.String(),

     

       92
       92
       -
       					"expires", entry.ExpireAt.Sub(time.Now()).String())

     

       93
       93
       -
       			}

     

       94
       94
       -
       		}

     

       95
       95
       -
       	}

     

       96
       96
       -
       

     

       97
       58
        
       	w.WriteMsg(msg)

     

       98
       59
        
       }

     

       99
       60
        
       

     

       100
       61
        
       func (h *QueryHandler) resolveQuestion(ctx context.Context, question magna.Question, servers []string) ([]magna.ResourceRecord, error) {

     

       101
       101
       -
       	depth := 0

     

       102
       102
       -
       	if d, ok := ctx.Value("recursion_depth").(int); ok {

     

       103
       103
       -
       		depth = d

     

       104
       104
       -
       	}

     

       62
       62
       +
       	ch := make(chan queryResponse, len(servers))

     

       105
       63
        
       

     

       106
       106
       -
       	// TODO move to configuration file

     

       107
       107
       -
       	if depth > 15 {

     

       108
       108
       -
       		h.Logger.Warn("Max recursion depth exceeded", "question", question.QName, "depth", depth)

     

       109
       109
       -
       		return nil, fmt.Errorf("max recursion depth exceeded")

     

       110
       110
       -
       	}

     

       111
       111
       -
       	ctx = context.WithValue(ctx, "recursion_depth", depth+1)

     

       112
       112
       -
       

     

       113
       113
       -
       	if h.Cache != nil {

     

       114
       114
       -
       		cacheKey := GenerateCacheKey(question)

     

       115
       115
       -
       		if entry, found := h.Cache.Get(cacheKey); found {

     

       116
       116
       -
       			h.Logger.Debug("cache hit during recursion", "question", question.QName, "type", question.QType)

     

       117
       117
       -
       

     

       118
       118
       -
       			if entry.RCode == magna.NXDOMAIN {

     

       119
       119
       -
       				return entry.Authority, errNXDOMAIN

     

       120
       120
       -
       			}

     

       64
       64
       +
       	labels = strings.Split(question.QName, ".")

     

       121
       65
        
       

     

       122
       122
       -
       			if entry.IsNegative {

     

       123
       123
       -
       				return []magna.ResourceRecord{}, nil

     

       124
       124
       -
       			}

     

       125
       125
       -
       

     

       126
       126
       -
       			return entry.Answer, nil

     

       127
       127
       -
       		}

     

       128
       128
       -
       	}

     

       129
       129
       -
       

     

       130
       130
       -
       	resolveCtx, cancel := context.WithTimeout(ctx, h.Timeout)

     

       131
       131
       -
       	defer cancel()

     

       132
       132
       -
       

     

       133
       133
       -
       	ch := make(chan queryResponse, len(servers))

     

       134
       134
       -
       

     

       66
       66
       +
       	for label in 		

     

       135
       67
        
       	for _, s := range servers {

     

       136
       136
       -
       		go queryServer(resolveCtx, question, s, ch)

     

       68
       68
       +
       		go queryServer(ctx, question, s, ch, h.Timeout)

     

       137
       69
        
       	}

     

       138
       138
       -
       

     

       139
       139
       -
       	var lastError error

     

       140
       70
        
       

     

       141
       71
        
       	for range servers {

     

       142
       72
        
       		select {

     

       143
       73
        
       		case res := <-ch:

     

       144
       74
        
       			if res.Error != nil {

     

       145
       145
       -
       				h.Logger.Warn("error", "question", question.QName, "server", res.Server, "error", res.Error)

     

       146
       146
       -
       				lastError = res.Error

     

       147
       147
       -
       				continue

     

       75
       75
       +
       				break

     

       148
       76
        
       			}

     

       149
       77
        
       

     

       150
       78
        
       			msg := res.MSG

     

       151
       151
       -
       

     

       152
       152
       -
       			fullMsg := magna.Message{

     

       153
       153
       -
       				Header:     msg.Header,

     

       154
       154
       -
       				Question:   []magna.Question{question},

     

       155
       155
       -
       				Answer:     msg.Answer,

     

       156
       156
       -
       				Authority:  msg.Authority,

     

       157
       157
       -
       				Additional: msg.Additional,

     

       158
       158
       -
       			}

     

       159
       159
       -
       			fullMsg.Header.ANCount = uint16(len(msg.Answer))

     

       160
       160
       -
       			fullMsg.Header.NSCount = uint16(len(msg.Authority))

     

       161
       161
       -
       			fullMsg.Header.ARCount = uint16(len(msg.Additional))

     

       162
       162
       -
       

     

       163
       163
       -
       			if msg.Header.RCode == magna.NXDOMAIN {

     

       164
       164
       -
       				if h.Cache != nil {

     

       165
       165
       -
       					entry := CreateCacheEntry(question, &fullMsg)

     

       166
       166
       -
       					if entry != nil {

     

       167
       167
       -
       						h.Cache.Set(GenerateCacheKey(question), entry)

     

       168
       168
       -
       					}

     

       169
       169
       -
       				}

     

       170
       170
       -
       				return msg.Authority, errNXDOMAIN

     

       171
       171
       -
       			}

     

       172
       172
       -
       

     

       173
       79
        
       			if msg.Header.ANCount > 0 {

     

       174
       80
        
       				if msg.Answer[0].RType == magna.CNAMEType {

     

       175
       175
       -
       					if h.Cache != nil {

     

       176
       176
       -
       						partialEntry := CreateCacheEntry(question, &fullMsg)

     

       177
       177
       -
       						if partialEntry != nil {

     

       178
       178
       -
       							h.Cache.Set(GenerateCacheKey(question), partialEntry)

     

       179
       179
       -
       						}

     

       180
       180
       -
       					}

     

       181
       181
       -
       

     

       182
       182
       -
       					cnameTarget := msg.Answer[0].RData.String()

     

       183
       183
       -
       					h.Logger.Debug("following CNAME", "from", question.QName, "to", cnameTarget)

     

       184
       184
       -
       

     

       185
       185
       -
       					cname_answers, err := h.resolveQuestion(resolveCtx, magna.Question{

     

       186
       186
       -
       						QName:  cnameTarget,

     

       187
       187
       -
       						QType:  question.QType,

     

       188
       188
       -
       						QClass: question.QClass,

     

       189
       189
       -
       					}, h.RootServers)

     

       81
       81
       +
       					cname_answers, err := h.resolveQuestion(ctx, magna.Question{QName: msg.Answer[0].RData.String(), QType: question.QType, QClass: question.QClass}, h.RootServers)

     

       190
       82
        
       					if err != nil {

     

       191
       191
       -
       						if err == errNXDOMAIN {

     

       192
       192
       -
       							return cname_answers, errNXDOMAIN

     

       193
       193
       -
       						}

     

       194
       194
       -
       						h.Logger.Warn("error resolving CNAME", "cname", cnameTarget, "error", err)

     

       195
       83
        
       						continue

     

       196
       84
        
       					}

     

       197
       197
       -
       

     

       198
       198
       -
       					combinedAnswer := append([]magna.ResourceRecord{}, msg.Answer[0])

     

       199
       199
       -
       					combinedAnswer = append(combinedAnswer, cname_answers...)

     

       200
       200
       -
       

     

       201
       201
       -
       					fullMsg.Answer = combinedAnswer

     

       202
       202
       -
       					if h.Cache != nil {

     

       203
       203
       -
       						fullEntry := CreateCacheEntry(question, &fullMsg)

     

       204
       204
       -
       						if fullEntry != nil {

     

       205
       205
       -
       							h.Cache.Set(GenerateCacheKey(question), fullEntry)

     

       206
       206
       -
       						}

     

       207
       207
       -
       					}

     

       208
       208
       -
       

     

       209
       209
       -
       					return combinedAnswer, nil

     

       85
       85
       +
       					msg.Answer = append(msg.Answer, cname_answers...)

     

       210
       86
        
       				}

     

       211
       87
        
       

     

       212
       212
       -
       				if h.Cache != nil {

     

       213
       213
       -
       					entry := CreateCacheEntry(question, &fullMsg)

     

       214
       214
       -
       					if entry != nil {

     

       215
       215
       -
       						h.Cache.Set(GenerateCacheKey(question), entry)

     

       216
       216
       -
       					}

     

       217
       217
       -
       				}

     

       218
       88
        
       				return msg.Answer, nil

     

       219
       89
        
       			}

     

       220
       90
        
       

     

       221
       221
       -
       			if msg.Header.NSCount > 0 {

     

       222
       222
       -
       				var nextServers []string

     

       223
       223
       -
       				var nsRecords []magna.ResourceRecord

     

       224
       224
       -
       				nsRecordsWithoutGlue := 0

     

       225
       225
       -
       

     

       226
       226
       -
       				glueMap := make(map[string]string)

     

       227
       227
       -
       				for _, rr := range msg.Additional {

     

       228
       228
       -
       					if rr.RType == magna.AType {

     

       229
       229
       -
       						glueMap[strings.ToLower(rr.Name)] = rr.RData.String()

     

       91
       91
       +
       			if msg.Header.ARCount > 0 {

     

       92
       92
       +
       				var nextZone []string

     

       93
       93
       +
       				for _, ans := range msg.Additional {

     

       94
       94
       +
       					if ans.RType == magna.AType {

     

       95
       95
       +
       						nextZone = append(nextZone, ans.RData.String())

     

       230
       96
        
       					}

     

       231
       97
        
       				}

     

       232
       98
        
       

     

       233
       233
       -
       				for _, rr := range msg.Authority {

     

       234
       234
       -
       					if rr.RType == magna.NSType {

     

       235
       235
       -
       						nsRecords = append(nsRecords, rr)

     

       236
       236
       -
       					}

     

       237
       237
       -
       				}

     

       99
       99
       +
       				return h.resolveQuestion(ctx, question, nextZone)

     

       100
       100
       +
       			}

     

       238
       101
        
       

     

       239
       239
       -
       				for _, nsRR := range nsRecords {

     

       240
       240
       -
       					nsName := strings.ToLower(nsRR.RData.String())

     

       241
       241
       -
       

     

       242
       242
       -
       					if ip, found := glueMap[nsName]; found {

     

       243
       243
       -
       						nextServers = append(nextServers, ip)

     

       244
       244
       -
       					} else {

     

       245
       245
       -
       						nsRecordsWithoutGlue++

     

       246
       246
       -
       						nsQuestion := magna.Question{QName: nsName, QType: magna.AType, QClass: magna.IN}

     

       247
       247
       -
       						nsAnswers, err := h.resolveQuestion(resolveCtx, nsQuestion, h.RootServers)

     

       102
       102
       +
       			if msg.Header.NSCount > 0 {

     

       103
       103
       +
       				var ns []string

     

       104
       104
       +
       				for _, a := range msg.Authority {

     

       105
       105
       +
       					if a.RType == magna.NSType {

     

       106
       106
       +
       						ans, err := h.resolveQuestion(ctx, magna.Question{QName: a.RData.String(), QType: magna.AType, QClass: magna.IN}, h.RootServers)

     

       248
       107
        
       						if err != nil {

     

       249
       249
       -
       							h.Logger.Warn("error resolving NS A record", "ns", nsName, "error", err)

     

       250
       250
       -
       							continue

     

       251
       251
       -
       						} else {

     

       252
       252
       -
       							foundAddr := false

     

       253
       253
       -
       								for _, ans := range nsAnswers {

     

       254
       254
       -
       									if ans.RType == magna.AType && strings.ToLower(ans.Name) == nsName {

     

       255
       255
       -
       										ipAddr := ans.RData.String()

     

       256
       256
       -
       										nextServers = append(nextServers, ipAddr)

     

       257
       257
       -
       										foundAddr = true

     

       258
       258
       -
       									}

     

       259
       259
       -
       								}

     

       260
       260
       -
       							if !foundAddr {

     

       261
       261
       -
       								h.Logger.Warn("A record lookup for NS succeeded but yielded no matching A records", "ns", nsName)

     

       262
       262
       -
       							}

     

       108
       108
       +
       							break

     

       263
       109
        
       						}

     

       264
       264
       -
       

     

       265
       265
       -
       					}

     

       266
       266
       -
       				}

     

       267
       267
       -
       

     

       268
       268
       -
       				if len(nextServers) > 0 {

     

       269
       269
       -
       					return h.resolveQuestion(ctx, question, nextServers)

     

       270
       270
       -
       				} else {

     

       271
       271
       -
       					h.Logger.Warn("Processed delegation but failed to find any next server IPs", "question", question.QName, "server", res.Server, "ns_records_count", len(nsRecords), "ns_without_glue", nsRecordsWithoutGlue, "depth", depth)

     

       272
       272
       -
       					lastError = fmt.Errorf("failed to resolve NS addresses for delegation from %s", res.Server)

     

       273
       273
       -
       				}

     

       274
       274
       -
       

     

       275
       275
       -
       				h.Logger.Warn("could not resolve any NS records for delegation", "question", question.QName)

     

       276
       276
       -
       				continue

     

       277
       277
       -
       			}

     

       278
       278
       -
       

     

       279
       279
       -
       			if msg.Header.RCode == magna.NOERROR && msg.Header.ANCount == 0 && msg.Header.NSCount == 0{

     

       280
       280
       -
       				h.Logger.Debug("Received NODATA response (NOERROR, ANCount=0)", "question", question.QName, "server", res.Server, "depth", depth)

     

       281
       281
       -
       

     

       282
       282
       -
       				if h.Cache != nil {

     

       283
       283
       -
       					entry := CreateCacheEntry(question, &fullMsg)

     

       284
       284
       -
       					if entry != nil {

     

       285
       285
       -
       						h.Cache.Set(GenerateCacheKey(question), entry)

     

       110
       110
       +
       						for _, x := range ans {

     

       111
       111
       +
       							ns = append(ns, x.RData.String())

     

       112
       112
       +
       						}

     

       286
       113
        
       					}

     

       287
       114
        
       				}

     

       288
       115
        
       

     

       289
       289
       -
       				return []magna.ResourceRecord{}, nil

     

       116
       116
       +
       				return h.resolveQuestion(ctx, question, ns)

     

       290
       117
        
       			}

     

       291
       118
        
       

     

       292
       292
       -
       			h.Logger.Warn("Unhandled response state", "question", question.QName, "server", res.Server, "rcode", msg.Header.RCode.String(), "ancount", msg.Header.ANCount, "nscount", msg.Header.NSCount, "depth", depth)

     

       293
       293
       -
       			lastError = fmt.Errorf("unhandled response code %s from %s", msg.Header.RCode.String(), res.Server)

     

       294
       294
       -
       

     

       295
       295
       -
       		case <-resolveCtx.Done():

     

       296
       296
       -
       			h.Logger.Warn("Resolution step timed out or cancelled", "question", question.QName, "elapsed", time.Since(time.Now().Add(-h.Timeout)), "depth", depth, "error", resolveCtx.Err()) // Approx elapsed

     

       297
       297
       -
       			if lastError != nil {

     

       298
       298
       -
       				return nil, fmt.Errorf("resolution timed out after error: %w", lastError)

     

       299
       299
       -
       			}

     

       300
       300
       -
       			return nil, fmt.Errorf("resolution step timed out or cancelled: %w", resolveCtx.Err())

     

       119
       119
       +
       			return []magna.ResourceRecord{}, nil

     

       301
       120
        
       		}

     

       302
       121
        
       	}

     

       303
       122
        
       

     

       304
       304
       -
       	h.Logger.Warn("all resolution paths failed", "question", question.QName)

     

       305
       305
       -
       	if lastError != nil {

     

       306
       306
       -
       		return nil, fmt.Errorf("all resolution paths failed: %w", lastError)

     

       307
       307
       -
       	}

     

       308
       308
       -
       	return []magna.ResourceRecord{}, fmt.Errorf("all resolution paths failed")

     

       123
       123
       +
       	return []magna.ResourceRecord{}, nil

     

       309
       124
        
       }

     

       310
       125
        
       

     

       311
       311
       -
       func queryServer(ctx context.Context, question magna.Question, server string, ch chan<- queryResponse) {

     

       312
       312
       -
       	var response queryResponse

     

       313
       313
       -
       	response.Server = server

     

       314
       314
       -
       

     

       315
       315
       -
       	bufPtr := resolverUDPBufferPool.Get().(*[]byte)

     

       316
       316
       -
       	defer resolverUDPBufferPool.Put(bufPtr)

     

       317
       317
       -
       	p := *bufPtr

     

       126
       126
       +
       func queryServer(ctx context.Context, question magna.Question, server string, ch chan<- queryResponse, timeout time.Duration) {

     

       127
       127
       +
       	done := make(chan struct{}, 1)

     

       318
       128
        
       

     

       319
       319
       -
       	defer func() {

     

       320
       320
       -
       		if ctx.Err() != nil {

     

       321
       321
       -
       			if response.Error == nil {

     

       322
       322
       -
       				response.Error = ctx.Err()

     

       323
       323
       -
       			}

     

       129
       129
       +
       	go func() {

     

       130
       130
       +
       		conn, err := net.Dial("udp", fmt.Sprintf("%s:53", server))

     

       131
       131
       +
       		if err != nil {

     

       132
       132
       +
       			ch <- queryResponse{Error: err}

     

       133
       133
       +
       			return

     

       324
       134
        
       		}

     

       135
       135
       +
       		defer conn.Close()

     

       325
       136
        
       

     

       326
       326
       -
       		select {

     

       327
       327
       -
       		case ch <- response:

     

       328
       328
       -
       		case <-ctx.Done():

     

       329
       329
       -
       			slog.Debug("queryServer response channel send cancelled by context", "server", server, "question", question.QName)

     

       330
       330
       -
       		default:

     

       331
       331
       -
       			slog.Debug("queryServer response channel blocked or closed on send", "server", server, "question", question.QName)

     

       137
       137
       +
       		query := magna.CreateRequest(0, false)

     

       138
       138
       +
       		query = query.AddQuestion(question)

     

       139
       139
       +
       		msg, err := query.Encode()

     

       140
       140
       +
       		if err != nil {

     

       141
       141
       +
       			ch <-queryResponse{Server: server, Error: err}

     

       332
       142
        
       		}

     

       333
       333
       -
       	}()

     

       334
       143
        
       

     

       335
       335
       -
       	select {

     

       336
       336
       -
       	case <-ctx.Done():

     

       337
       337
       -
       		response.Error = ctx.Err()

     

       338
       338
       -
       		return

     

       339
       339
       -
       	default:

     

       340
       340
       -
       	}

     

       341
       341
       -
       

     

       342
       342
       -
       	dialer := net.Dialer{Timeout: 2 * time.Second}

     

       343
       343
       -
       	conn, err := dialer.DialContext(ctx, "udp", fmt.Sprintf("%s:53", server))

     

       344
       344
       -
       	if err != nil {

     

       345
       345
       -
       		if ctx.Err() != nil {

     

       346
       346
       -
       			response.Error = ctx.Err()

     

       347
       347
       -
       		} else {

     

       348
       348
       -
       			response.Error = fmt.Errorf("dial error: %w", err)

     

       144
       144
       +
       		if _, err := conn.Write(msg); err != nil {

     

       145
       145
       +
       			ch <- queryResponse{Server: server, Error: err}

     

       146
       146
       +
       			return

     

       349
       147
        
       		}

     

       350
       148
        
       

     

       351
       351
       -
       		return

     

       352
       352
       -
       	}

     

       353
       353
       -
       	defer conn.Close()

     

       354
       354
       -
       

     

       355
       355
       -
       	deadline, ok := ctx.Deadline()

     

       356
       356
       -
       	if !ok {

     

       357
       357
       -
       		deadline = time.Now().Add(5 * time.Second)

     

       358
       358
       -
       	}

     

       359
       359
       -
       	conn.SetDeadline(deadline)

     

       360
       360
       -
       

     

       361
       361
       -
       	query := magna.Message{

     

       362
       362
       -
       		Header: magna.Header{

     

       363
       363
       -
       			ID:      uint16(rand.Int() % 65535),

     

       364
       364
       -
       			QR:      false,

     

       365
       365
       -
       			OPCode:  magna.QUERY,

     

       366
       366
       -
       			AA:      false,

     

       367
       367
       -
       			TC:      false,

     

       368
       368
       -
       			RD:      false,

     

       369
       369
       -
       			RA:      false,

     

       370
       370
       -
       			Z:       0,

     

       371
       371
       -
       			RCode:   magna.NOERROR,

     

       372
       372
       -
       			QDCount: 1,

     

       373
       373
       -
       			ARCount: 0,

     

       374
       374
       -
       			NSCount: 0,

     

       375
       375
       -
       			ANCount: 0,

     

       376
       376
       -
       		},

     

       377
       377
       -
       		Question: []magna.Question{question},

     

       378
       378
       -
       	}

     

       379
       379
       -
       

     

       380
       380
       -
       	msgBytes, err := query.Encode()

     

       381
       381
       -
       	if err != nil {

     

       382
       382
       -
       		response.Error = fmt.Errorf("encode error: %w", err)

     

       383
       383
       -
       		return

     

       384
       384
       -
       	}

     

       385
       385
       -
       

     

       386
       386
       -
       	_, err = conn.Write(msgBytes)

     

       387
       387
       -
       	if err != nil {

     

       388
       388
       -
       		if ctx.Err() != nil {

     

       389
       389
       -
       			response.Error = ctx.Err()

     

       390
       390
       -
       		} else {

     

       391
       391
       -
       			response.Error = fmt.Errorf("write error: %w", err)

     

       392
       392
       -
       		}

     

       393
       393
       -
       		return

     

       394
       394
       -
       	}

     

       149
       149
       +
       		p := make([]byte, 512)

     

       150
       150
       +
       		nn, err := conn.Read(p)

     

       395
       151
        
       

     

       396
       396
       -
       	n, err := conn.Read(p)

     

       397
       397
       -
       	if err != nil {

     

       398
       398
       -
       		if ctx.Err() != nil {

     

       399
       399
       -
       			response.Error = ctx.Err()

     

       400
       400
       -
       		} else if netErr, ok := err.(net.Error); ok && netErr.Timeout() {

     

       401
       401
       -
       			response.Error = fmt.Errorf("read timeout: %w", err)

     

       402
       402
       -
       		} else {

     

       403
       403
       -
       			response.Error = fmt.Errorf("read error: %w", err)

     

       152
       152
       +
       		// TODO: retry request with TCP

     

       153
       153
       +
       		if err != nil || nn > 512 {

     

       154
       154
       +
       			if err == nil {

     

       155
       155
       +
       				err = fmt.Errorf("truncated response")

     

       156
       156
       +
       			}

     

       157
       157
       +
       			ch <- queryResponse{Server: server, Error: err}

     

       158
       158
       +
       			return

     

       404
       159
        
       		}

     

       405
       405
       -
       		return

     

       406
       406
       -
       	}

     

       407
       160
        
       

     

       408
       408
       -
       	// TODO: retry request with TCP

     

       409
       409
       -
       	if n > 512 {

     

       410
       410
       -
       		response.Error = fmt.Errorf("response possibly truncated (size %d >= 512)", n)

     

       411
       411
       -
       		return

     

       412
       412
       -
       	}

     

       161
       161
       +
       		var response magna.Message

     

       162
       162
       +
       		err = response.Decode(p)

     

       163
       163
       +
       		ch <- queryResponse{MSG: response, Server: server, Error: err}

     

       164
       164
       +
       	}()

     

       413
       165
        
       

     

       414
       414
       -
       	var decodedMsg magna.Message

     

       415
       415
       -
       	err = decodedMsg.Decode(p[:n])

     

       416
       416
       -
       	if err != nil {

     

       417
       417
       -
       		response.Error = fmt.Errorf("decode error: %w", err)

     

       418
       418
       -
       		return

     

       166
       166
       +
       	select {

     

       167
       167
       +
       	case <-ctx.Done():

     

       168
       168
       +
       		ch <- queryResponse{Server: server, Error: ctx.Err()}

     

       169
       169
       +
       	case <-done:

     

       170
       170
       +
       	// goroutine finished with no cancellation

     

       171
       171
       +
       	case <-time.After(timeout):

     

       172
       172
       +
       		ch <- queryResponse{Server: server, Error: fmt.Errorf("timeout")}

     

       419
       173
        
       	}

     

       420
       420
       -
       

     

       421
       421
       -
       	if decodedMsg.Header.ID != query.Header.ID {

     

       422
       422
       -
       		response.Error = fmt.Errorf("response ID mismatch (got %d, expected %d)", decodedMsg.Header.ID, query.Header.ID)

     

       423
       423
       -
       		return

     

       424
       424
       -
       	}

     

       425
       425
       -
       

     

       426
       426
       -
       	response.MSG = decodedMsg

     

       427
       427
       -
       	response.Error = nil

     

       428
       174
        
       }

+4 -19

pkg/dns/server.go

···

       16
       16
        
       type contextKey string

     

       17
       17
        
       

     

       18
       18
        
       const (

     

       19
       19
       -
       	cacheHitKey contextKey   = "cache_hit"

     

       20
       19
        
       	maxUDPBufferSize         = 4096

     

       21
       20
        
       	maxResolverUDPBufferSize = 4096

     

       22
       21
        
       )

     
···

       36
       35
        
       		},

     

       37
       36
        
       	}

     

       38
       37
        
       )

     

       39
       39
       -
       

     

       40
       40
       -
       func setCacheHit(ctx context.Context) context.Context {

     

       41
       41
       -
       	return context.WithValue(ctx, cacheHitKey, true)

     

       42
       42
       -
       }

     

       43
       43
       -
       

     

       44
       44
       -
       func setCacheMiss(ctx context.Context) context.Context {

     

       45
       45
       -
       	return context.WithValue(ctx, cacheHitKey, false)

     

       46
       46
       -
       }

     

       47
       47
       -
       

     

       48
       48
       -
       func GetCacheHit(ctx context.Context) bool {

     

       49
       49
       -
       	if ctx == nil {

     

       50
       50
       -
       		return false

     

       51
       51
       -
       	}

     

       52
       52
       -
       	v := ctx.Value(cacheHitKey)

     

       53
       53
       -
       	hit, ok := v.(bool)

     

       54
       54
       -
       	return ok && hit

     

       55
       55
       -
       }

     

       56
       38
        
       

     

       57
       39
        
       type Handler interface {

     

       58
       40
        
       	ServeDNS(ResponseWriter, *Request)

     
···

       407
       389
        
       		return

     

       408
       390
        
       	}

     

       409
       391
        
       

     

       392
       392
       +
       	ctx, cancel := context.WithTimeout(context.Background(), srv.ReadTimeout)

     

       393
       393
       +
       	defer cancel()

     

       394
       394
       +
       

     

       410
       395
        
       	r := &Request{

     

       411
       411
       -
       		Context:    context.Background(),

     

       396
       396
       +
       		Context:    ctx,

     

       412
       397
        
       		Message:    &query,

     

       413
       398
        
       		RemoteAddr: remoteAddr,

     

       414
       399
        
       	}

+2 -97

pkg/metrics/clickhouse.go

···

       17
       17
        
       	db          *sql.DB

     

       18
       18
        
       	config      *config.MetricsConfig

     

       19
       19
        
       	queryBuffer []QueryMetric

     

       20
       20
       -
       	cacheBuffer []CacheMetric

     

       21
       20
        
       	mu          sync.Mutex

     

       22
       21
        
       	stopChan    chan struct{}

     

       23
       22
        
       	wg          sync.WaitGroup

     
···

       33
       32
        
       	RemoteAddr   string

     

       34
       33
        
       	ResponseCode string

     

       35
       34
        
       	Duration     int64

     

       36
       36
       -
       	CacheHit     bool

     

       37
       37
       -
       }

     

       38
       38
       -
       

     

       39
       39
       -
       type CacheMetric struct {

     

       40
       40
       -
       	Timestamp    time.Time

     

       41
       41
       -
       	CacheHits    int64

     

       42
       42
       -
       	CacheMisses  int64

     

       43
       43
       -
       	NegativeHits int64

     

       44
       44
       -
       	PositiveHits int64

     

       45
       45
       -
       	Evictions    int64

     

       46
       46
       -
       	Size         int64

     

       47
       35
        
       }

     

       48
       36
        
       

     

       49
       37
        
       func NewClickHouseMetrics(config *config.MetricsConfig, logger *slog.Logger) (*ClickHouseMetrics, error) {

     
···

       67
       55
        
       		db:          db,

     

       68
       56
        
       		config:      config,

     

       69
       57
        
       		queryBuffer: make([]QueryMetric, 0, config.BatchSize),

     

       70
       70
       -
       		cacheBuffer: make([]CacheMetric, 0, config.BatchSize),

     

       71
       58
        
       		stopChan:    make(chan struct{}),

     

       72
       59
        
       		logger:      logger,

     

       73
       60
        
       	}

     
···

       93
       80
        
       	}

     

       94
       81
        
       }

     

       95
       82
        
       

     

       96
       96
       -
       func (m *ClickHouseMetrics) RecordCacheStats(metric CacheMetric) {

     

       97
       97
       -
       	m.mu.Lock()

     

       98
       98
       -
       	defer m.mu.Unlock()

     

       99
       99
       -
       

     

       100
       100
       -
       	m.cacheBuffer = append(m.cacheBuffer, metric)

     

       101
       101
       -
       	if len(m.cacheBuffer) >= m.config.BatchSize {

     

       102
       102
       -
       		m.flushCacheMetricsLocked()

     

       103
       103
       -
       	}

     

       104
       104
       -
       }

     

       105
       105
       -
       

     

       106
       83
        
       func (m *ClickHouseMetrics) flushLoop() {

     

       107
       84
        
       	defer m.wg.Done()

     

       108
       85
        
       	ticker := time.NewTicker(m.config.FlushInterval.Duration)

     
···

       131
       108
        
       	if len(m.queryBuffer) > 0 {

     

       132
       109
        
       		m.flushQueriesLocked()

     

       133
       110
        
       	}

     

       134
       134
       -
       	if len(m.cacheBuffer) > 0 {

     

       135
       135
       -
       		m.flushCacheMetricsLocked()

     

       136
       136
       -
       	}

     

       137
       111
        
       }

     

       138
       112
        
       

     

       139
       113
        
       func (m *ClickHouseMetrics) checkAndUpdateTTL() error {

     
···

       160
       134
        
       	}

     

       161
       135
        
       

     

       162
       136
        
       	if err := updateTableTTL("alky_dns_queries"); err != nil {

     

       163
       163
       -
       		return err

     

       164
       164
       -
       	}

     

       165
       165
       -
       	if err := updateTableTTL("alky_dns_cache_metrics"); err != nil {

     

       166
       137
        
       		return err

     

       167
       138
        
       	}

     

       168
       139
        
       

     
···

       195
       166
        
       		INSERT INTO alky_dns_queries (

     

       196
       167
        
       			timestamp, instance_id, query_name, query_type, query_class,

     

       197
       168
        
       			remote_addr, response_code, duration, cache_hit

     

       198
       198
       -
       		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)

     

       169
       169
       +
       		) VALUES (?, ?, ?, ?, ?, ?, ?, ?)

     

       199
       170
        
       	`)

     

       200
       171
        
       	if err != nil {

     

       201
       172
        
       		m.logger.Error("Failed to prepare statement for query metrics", "error", err)

     
···

       215
       186
        
       			metric.RemoteAddr,

     

       216
       187
        
       			metric.ResponseCode,

     

       217
       188
        
       			metric.Duration,

     

       218
       218
       -
       			metric.CacheHit,

     

       189
       189
       +
       			false,

     

       219
       190
        
       		)

     

       220
       191
        
       		if err != nil {

     

       221
       192
        
       			m.logger.Error("Failed to execute statement for query metric", "error", err, "metric_index", count)

     
···

       232
       203
        
       

     

       233
       204
        
       	m.logger.Debug("Successfully flushed query metrics", "count", count, "duration", time.Since(start))

     

       234
       205
        
       	m.queryBuffer = m.queryBuffer[:0]

     

       235
       235
       -
       }

     

       236
       236
       -
       

     

       237
       237
       -
       func (m *ClickHouseMetrics) flushCacheMetricsLocked() {

     

       238
       238
       -
       	if len(m.cacheBuffer) == 0 {

     

       239
       239
       -
       		return

     

       240
       240
       -
       	}

     

       241
       241
       -
       

     

       242
       242
       -
       	m.logger.Debug("Flushing cache metrics", "count", len(m.cacheBuffer))

     

       243
       243
       -
       	start := time.Now()

     

       244
       244
       -
       

     

       245
       245
       -
       	tx, err := m.db.Begin()

     

       246
       246
       -
       	if err != nil {

     

       247
       247
       -
       		m.logger.Error("Failed to begin transaction for cache metrics", "error", err)

     

       248
       248
       -
       		m.cacheBuffer = m.cacheBuffer[:0]

     

       249
       249
       -
       		return

     

       250
       250
       -
       	}

     

       251
       251
       -
       	defer func() {

     

       252
       252
       -
       		if err != nil {

     

       253
       253
       -
       			if rbErr := tx.Rollback(); rbErr != nil {

     

       254
       254
       -
       				m.logger.Error("Failed to rollback transaction for cache metrics", "error", rbErr)

     

       255
       255
       -
       			}

     

       256
       256
       -
       		}

     

       257
       257
       -
       	}()

     

       258
       258
       -
       

     

       259
       259
       -
       	stmt, err := tx.Prepare(`

     

       260
       260
       -
       		INSERT INTO alky_dns_cache_metrics (

     

       261
       261
       -
       			timestamp, instance_id, cache_hits, cache_misses,

     

       262
       262
       -
       			negative_hits, positive_hits, evictions,  size

     

       263
       263
       -
       		) VALUES (?, ?, ?, ?, ?, ?, ?, ?)

     

       264
       264
       -
       	`)

     

       265
       265
       -
       	if err != nil {

     

       266
       266
       -
       		m.logger.Error("Failed to prepare statement for cache metrics", "error", err)

     

       267
       267
       -
       		m.cacheBuffer = m.cacheBuffer[:0]

     

       268
       268
       -
       		return

     

       269
       269
       -
       	}

     

       270
       270
       -
       	defer stmt.Close()

     

       271
       271
       -
       

     

       272
       272
       -
       	count := 0

     

       273
       273
       -
       	for _, metric := range m.cacheBuffer {

     

       274
       274
       -
       		instanceID := GetInstanceID()

     

       275
       275
       -
       

     

       276
       276
       -
       		_, err = stmt.Exec(

     

       277
       277
       -
       			metric.Timestamp,

     

       278
       278
       -
       			instanceID,

     

       279
       279
       -
       			metric.CacheHits,

     

       280
       280
       -
       			metric.CacheMisses,

     

       281
       281
       -
       			metric.NegativeHits,

     

       282
       282
       -
       			metric.PositiveHits,

     

       283
       283
       -
       			metric.Evictions,

     

       284
       284
       -
       			metric.Size,

     

       285
       285
       -
       		)

     

       286
       286
       -
       		if err != nil {

     

       287
       287
       -
       			m.logger.Error("Failed to execute statement for cache metric", "error", err, "metric_index", count)

     

       288
       288
       -
       			return

     

       289
       289
       -
       		}

     

       290
       290
       -
       		count++

     

       291
       291
       -
       	}

     

       292
       292
       -
       

     

       293
       293
       -
       	err = tx.Commit()

     

       294
       294
       -
       	if err != nil {

     

       295
       295
       -
       		m.logger.Error("Failed to commit transaction for cache metrics", "error", err)

     

       296
       296
       -
       		return

     

       297
       297
       -
       	}

     

       298
       298
       -
       

     

       299
       299
       -
       	m.logger.Debug("Successfully flushed cache metrics", "count", count, "duration", time.Since(start))

     

       300
       300
       -
       	m.cacheBuffer = m.cacheBuffer[:0]

     

       301
       206
        
       }

     

       302
       207
        
       

     

       303
       208
        
       func (m *ClickHouseMetrics) Close() error {

pkg/rootservers/loader.go

···

       16
       16
        
       	}

     

       17
       17
        
       

     

       18
       18
        
       	for _, line := range bytes.Split(data, []byte{'\n'}) {

     

       19
       19
       +
       		if len(line) == 0 {

     

       20
       20
       +
       			continue

     

       21
       21
       +
       		}

     

       22
       22
       +
       

     

       19
       23
        
       		// skip comments

     

       20
       24
        
       		if line[0] == ';' {

     

       21
       25
        
       			continue