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package telemetry
import (
"context"
"fmt"
"github.com/go-redis/redis/v8"
"github.com/icinga/icingadb/internal"
"github.com/icinga/icingadb/pkg/com"
"github.com/icinga/icingadb/pkg/icingaredis"
"github.com/icinga/icingadb/pkg/logging"
"github.com/icinga/icingadb/pkg/periodic"
"github.com/icinga/icingadb/pkg/utils"
"github.com/pkg/errors"
"go.uber.org/zap"
"regexp"
"runtime/metrics"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
)
// ha represents icingadb.HA to avoid import cycles.
type ha interface {
State() (weResponsibleMilli int64, weResponsible, otherResponsible bool)
}
type SuccessfulSync struct {
FinishMilli int64
DurationMilli int64
}
// currentDbConnErr stores ongoing errors from database connections.
var currentDbConnErr struct {
mu sync.Mutex
message string
sinceMilli int64
}
// UpdateCurrentDbConnErr updates the current error information stored in currentDbConnErr.
func UpdateCurrentDbConnErr(err error) {
now := time.Now().UnixMilli()
currentDbConnErr.mu.Lock()
defer currentDbConnErr.mu.Unlock()
if currentDbConnErr.sinceMilli >= now {
// Already updated with a more recent error, ignore this one.
return
}
message := ""
if err != nil {
message = err.Error()
}
if currentDbConnErr.message == message {
// Error stayed the same, no update needed, keeping the old timestamp.
return
}
if currentDbConnErr.message == "" || message == "" {
// Either first error or recovery from an error, update timestamp.
currentDbConnErr.sinceMilli = now
}
currentDbConnErr.message = message
}
// GetCurrentDbConnErr returns the last error message (or the empty string if not in an error state) and a timestamp in
// milliseconds of the last change from OK to error or from error to OK.
func GetCurrentDbConnErr() (string, int64) {
currentDbConnErr.mu.Lock()
defer currentDbConnErr.mu.Unlock()
return currentDbConnErr.message, currentDbConnErr.sinceMilli
}
// OngoingSyncStartMilli is to be updated by the main() function.
var OngoingSyncStartMilli int64
// LastSuccessfulSync is to be updated by the main() function.
var LastSuccessfulSync com.Atomic[SuccessfulSync]
var boolToStr = map[bool]string{false: "0", true: "1"}
var startTime = time.Now().UnixMilli()
// StartHeartbeat periodically writes heartbeats to Redis for being monitored by Icinga 2.
func StartHeartbeat(
ctx context.Context, client *icingaredis.Client, logger *logging.Logger, ha ha, heartbeat *icingaredis.Heartbeat,
) {
goMetrics := NewGoMetrics()
const interval = time.Second
var lastErr string
var silenceUntil time.Time
periodic.Start(ctx, interval, func(tick periodic.Tick) {
heartbeat := heartbeat.LastReceived()
responsibleTsMilli, responsible, otherResponsible := ha.State()
ongoingSyncStart := atomic.LoadInt64(&OngoingSyncStartMilli)
sync, _ := LastSuccessfulSync.Load()
dbConnErr, dbConnErrSinceMilli := GetCurrentDbConnErr()
now := time.Now()
values := map[string]string{
"version": internal.Version.Version,
"time": strconv.FormatInt(now.UnixMilli(), 10),
"start-time": strconv.FormatInt(startTime, 10),
"error": dbConnErr,
"error-since": strconv.FormatInt(dbConnErrSinceMilli, 10),
"performance-data": goMetrics.PerformanceData(),
"last-heartbeat-received": strconv.FormatInt(heartbeat, 10),
"ha-responsible": boolToStr[responsible],
"ha-responsible-ts": strconv.FormatInt(responsibleTsMilli, 10),
"ha-other-responsible": boolToStr[otherResponsible],
"sync-ongoing-since": strconv.FormatInt(ongoingSyncStart, 10),
"sync-success-finish": strconv.FormatInt(sync.FinishMilli, 10),
"sync-success-duration": strconv.FormatInt(sync.DurationMilli, 10),
}
ctx, cancel := context.WithDeadline(ctx, tick.Time.Add(interval))
defer cancel()
cmd := client.XAdd(ctx, &redis.XAddArgs{
Stream: "icingadb:telemetry:heartbeat",
MaxLen: 1,
Values: values,
})
if err := cmd.Err(); err != nil && !utils.IsContextCanceled(err) && !errors.Is(err, context.DeadlineExceeded) {
logw := logger.Debugw
currentErr := err.Error()
if currentErr != lastErr || now.After(silenceUntil) {
logw = logger.Warnw
lastErr = currentErr
silenceUntil = now.Add(time.Minute)
}
logw("Can't update own heartbeat", zap.Error(icingaredis.WrapCmdErr(cmd)))
} else {
lastErr = ""
silenceUntil = time.Time{}
}
})
}
type goMetrics struct {
names []string
units []string
samples []metrics.Sample
}
func NewGoMetrics() *goMetrics {
m := &goMetrics{}
forbiddenRe := regexp.MustCompile(`\W`)
for _, d := range metrics.All() {
switch d.Kind {
case metrics.KindUint64, metrics.KindFloat64:
name := "go_" + strings.TrimLeft(forbiddenRe.ReplaceAllString(d.Name, "_"), "_")
unit := ""
if strings.HasSuffix(d.Name, ":bytes") {
unit = "B"
} else if strings.HasSuffix(d.Name, ":seconds") {
unit = "s"
} else if d.Cumulative {
unit = "c"
}
m.names = append(m.names, name)
m.units = append(m.units, unit)
m.samples = append(m.samples, metrics.Sample{Name: d.Name})
}
}
return m
}
func (g *goMetrics) PerformanceData() string {
metrics.Read(g.samples)
var buf strings.Builder
for i, sample := range g.samples {
if i > 0 {
buf.WriteByte(' ')
}
switch sample.Value.Kind() {
case metrics.KindUint64:
_, _ = fmt.Fprintf(&buf, "%s=%d%s", g.names[i], sample.Value.Uint64(), g.units[i])
case metrics.KindFloat64:
_, _ = fmt.Fprintf(&buf, "%s=%f%s", g.names[i], sample.Value.Float64(), g.units[i])
}
}
return buf.String()
}
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