mirror of
https://github.com/grafana/grafana.git
synced 2024-11-23 09:26:43 -06:00
206 lines
7.2 KiB
Go
206 lines
7.2 KiB
Go
package alerting
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import (
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"bytes"
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"context"
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"fmt"
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"math/rand"
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"sync"
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"testing"
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"time"
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"github.com/benbjohnson/clock"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/testutil"
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"github.com/stretchr/testify/require"
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"github.com/grafana/grafana/pkg/services/alerting/metrics"
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)
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func TestTicker(t *testing.T) {
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readChanOrFail := func(t *testing.T, c chan time.Time) time.Time {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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t.Cleanup(func() {
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cancel()
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})
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t.Helper()
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select {
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case tick := <-c:
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return tick
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case <-ctx.Done():
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require.Failf(t, fmt.Sprintf("%v", ctx.Err()), "timeout reading the channel")
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default:
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require.Failf(t, "channel is empty but it should have a tick", "")
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}
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return time.Time{}
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}
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t.Run("should align with clock", func(t *testing.T) {
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interval := 10 * time.Second
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clk := clock.NewMock()
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clk.Add(1 * time.Minute)
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require.Equal(t, clk.Now(), getStartTick(clk, interval))
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now := clk.Now()
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for i := 0; i < 100; i++ {
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delta := time.Duration(rand.Int63n(interval.Nanoseconds()))
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clk.Set(now.Add(delta))
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require.Equal(t, now, getStartTick(clk, interval))
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}
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})
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t.Run("should not drop ticks", func(t *testing.T) {
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interval := time.Duration(rand.Int63n(100)+10) * time.Second
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clk := clock.NewMock()
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clk.Add(interval) // align clock with the start tick
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ticker := NewTicker(clk, interval, metrics.NewTickerMetrics(prometheus.NewRegistry()))
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ticks := rand.Intn(9) + 1
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jitter := rand.Int63n(int64(interval) - 1)
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clk.Add(time.Duration(ticks)*interval + time.Duration(jitter))
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w := sync.WaitGroup{}
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w.Add(1)
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regTicks := make([]time.Time, 0, ticks)
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go func() {
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for timestamp := range ticker.C {
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regTicks = append(regTicks, timestamp)
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if len(regTicks) == ticks {
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w.Done()
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}
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}
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}()
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w.Wait()
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require.Len(t, regTicks, ticks)
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t.Run("ticks should monotonically increase", func(t *testing.T) {
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for i := 1; i < len(regTicks); i++ {
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previous := regTicks[i-1]
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current := regTicks[i]
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require.Equal(t, interval, current.Sub(previous))
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}
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})
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})
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t.Run("should not put anything to channel until it's time", func(t *testing.T) {
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clk := clock.NewMock()
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interval := time.Duration(rand.Int63n(9)+1) * time.Second
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ticker := NewTicker(clk, interval, metrics.NewTickerMetrics(prometheus.NewRegistry()))
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expectedTick := clk.Now().Add(interval)
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for {
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require.Empty(t, ticker.C)
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clk.Add(time.Duration(rand.Int31n(500)+100) * time.Millisecond)
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if clk.Now().After(expectedTick) {
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break
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}
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}
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actual := readChanOrFail(t, ticker.C)
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require.Equal(t, expectedTick, actual)
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})
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t.Run("should put the tick in the channel immediately if it is behind", func(t *testing.T) {
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clk := clock.NewMock()
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interval := time.Duration(rand.Int63n(9)+1) * time.Second
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ticker := NewTicker(clk, interval, metrics.NewTickerMetrics(prometheus.NewRegistry()))
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// We can expect the first tick to be at a consistent interval. Take a snapshot of the clock now, before we advance it.
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expectedTick := clk.Now().Add(interval)
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require.Empty(t, ticker.C)
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clk.Add(interval) // advance the clock by the interval to make the ticker tick the first time.
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clk.Add(interval) // advance the clock by the interval to make the ticker tick the second time.
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// Irregardless of wall time, the first tick should be initial clock + interval.
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actual1 := readChanOrFail(t, ticker.C)
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require.Equal(t, expectedTick, actual1)
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var actual2 time.Time
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require.Eventually(t, func() bool {
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actual2 = readChanOrFail(t, ticker.C)
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return true
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}, time.Second, 10*time.Millisecond)
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// Similarly, the second tick should be last tick + interval irregardless of wall time.
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require.Equal(t, expectedTick.Add(interval), actual2)
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})
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t.Run("should report metrics", func(t *testing.T) {
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clk := clock.NewMock()
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clk.Set(time.Now())
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interval := time.Duration(rand.Int63n(9)+1) * time.Second
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registry := prometheus.NewPedanticRegistry()
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ticker := NewTicker(clk, interval, metrics.NewTickerMetrics(registry))
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expectedTick := getStartTick(clk, interval).Add(interval)
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expectedMetricFmt := `# HELP grafana_alerting_ticker_interval_seconds Interval at which the ticker is meant to tick.
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# TYPE grafana_alerting_ticker_interval_seconds gauge
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grafana_alerting_ticker_interval_seconds %v
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# HELP grafana_alerting_ticker_last_consumed_tick_timestamp_seconds Timestamp of the last consumed tick in seconds.
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# TYPE grafana_alerting_ticker_last_consumed_tick_timestamp_seconds gauge
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grafana_alerting_ticker_last_consumed_tick_timestamp_seconds %v
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# HELP grafana_alerting_ticker_next_tick_timestamp_seconds Timestamp of the next tick in seconds before it is consumed.
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# TYPE grafana_alerting_ticker_next_tick_timestamp_seconds gauge
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grafana_alerting_ticker_next_tick_timestamp_seconds %v
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`
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expectedMetric := fmt.Sprintf(expectedMetricFmt, interval.Seconds(), 0, float64(expectedTick.UnixNano())/1e9)
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errs := make(map[string]error, 1)
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require.Eventuallyf(t, func() bool {
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err := testutil.GatherAndCompare(registry, bytes.NewBufferString(expectedMetric), "grafana_alerting_ticker_last_consumed_tick_timestamp_seconds", "grafana_alerting_ticker_next_tick_timestamp_seconds", "grafana_alerting_ticker_interval_seconds")
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if err != nil {
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errs["error"] = err
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}
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return err == nil
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}, 1*time.Second, 100*time.Millisecond, "failed to wait for metrics to match expected values:\n%v", errs)
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clk.Add(interval)
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actual := readChanOrFail(t, ticker.C)
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expectedMetric = fmt.Sprintf(expectedMetricFmt, interval.Seconds(), float64(actual.UnixNano())/1e9, float64(expectedTick.Add(interval).UnixNano())/1e9)
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require.Eventuallyf(t, func() bool {
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err := testutil.GatherAndCompare(registry, bytes.NewBufferString(expectedMetric), "grafana_alerting_ticker_last_consumed_tick_timestamp_seconds", "grafana_alerting_ticker_next_tick_timestamp_seconds", "grafana_alerting_ticker_interval_seconds")
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if err != nil {
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errs["error"] = err
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}
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return err == nil
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}, 1*time.Second, 100*time.Millisecond, "failed to wait for metrics to match expected values:\n%v", errs)
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})
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t.Run("should stop", func(t *testing.T) {
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t.Run("when it waits for the next tick", func(t *testing.T) {
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clk := clock.NewMock()
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interval := time.Duration(rand.Int63n(9)+1) * time.Second
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ticker := NewTicker(clk, interval, metrics.NewTickerMetrics(prometheus.NewRegistry()))
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clk.Add(interval)
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readChanOrFail(t, ticker.C)
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ticker.Stop()
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clk.Add(interval)
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require.Empty(t, ticker.C)
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})
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t.Run("when it waits for the tick to be consumed", func(t *testing.T) {
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clk := clock.NewMock()
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interval := time.Duration(rand.Int63n(9)+1) * time.Second
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ticker := NewTicker(clk, interval, metrics.NewTickerMetrics(prometheus.NewRegistry()))
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clk.Add(interval)
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ticker.Stop()
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require.Empty(t, ticker.C)
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})
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t.Run("multiple times", func(t *testing.T) {
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clk := clock.NewMock()
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interval := time.Duration(rand.Int63n(9)+1) * time.Second
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ticker := NewTicker(clk, interval, metrics.NewTickerMetrics(prometheus.NewRegistry()))
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ticker.Stop()
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ticker.Stop()
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ticker.Stop()
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})
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})
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}
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