60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
package redis_test
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import (
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"fmt"
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"sync/atomic"
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"time"
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redis "gopkg.in/redis.v5"
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)
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func Example_instrumentation() {
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ring := redis.NewRing(&redis.RingOptions{
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Addrs: map[string]string{
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"shard1": ":6379",
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},
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})
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ring.ForEachShard(func(client *redis.Client) error {
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wrapRedisProcess(client)
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return nil
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})
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for {
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ring.Ping()
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}
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}
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func wrapRedisProcess(client *redis.Client) {
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const precision = time.Microsecond
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var count, avgDur uint32
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go func() {
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for _ = range time.Tick(3 * time.Second) {
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n := atomic.LoadUint32(&count)
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dur := time.Duration(atomic.LoadUint32(&avgDur)) * precision
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fmt.Printf("%s: processed=%d avg_dur=%s\n", client, n, dur)
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}
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}()
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client.WrapProcess(func(oldProcess func(redis.Cmder) error) func(redis.Cmder) error {
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return func(cmd redis.Cmder) error {
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start := time.Now()
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err := oldProcess(cmd)
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dur := time.Since(start)
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const decay = float64(1) / 100
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ms := float64(dur / precision)
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for {
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avg := atomic.LoadUint32(&avgDur)
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newAvg := uint32((1-decay)*float64(avg) + decay*ms)
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if atomic.CompareAndSwapUint32(&avgDur, avg, newAvg) {
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break
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}
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}
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atomic.AddUint32(&count, 1)
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return err
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}
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})
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}
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