metrics

README

metrics

metrics package helps to create ydb-go-sdk traces with monitoring internal state of driver

Usage

import (
    "fmt"
    "sync/mutex"
    "time"
	
    "github.com/ydb-platform/ydb-go-sdk/v3"
    "github.com/ydb-platform/ydb-go-sdk-metrics"
)

// define custom gauge
type gauge struct {
    name string
    v    float64
    m    sync.Mutex
}

func (g *gauge) Inc() {
    g.m.Lock
    defer g.m.Unlock()
    g.v += 1
}

func (g *gauge) Dec() {
    g.m.Lock
    defer g.m.Unlock()
    g.v -= 1
}

func (g *gauge) Set(value float64) {
    g.m.Lock
    defer g.m.Unlock()
    g.v = value
}

func (g *gauge) Value() float64 {
    g.m.Lock
    defer g.m.Unlock()
    return g.v	
}

// define custom registry
type config struct {
    gauges []gauge
    m      sync.Mutex
}

func (c *config) Details() Details {
    return metrics.DriverClusterEvents |
        metrics.DriverConnEvents |
        metrics.DriverCredentialsEvents |
        metrics.DriverDiscoveryEvents
}

func (c *config) Gauge(name string) Gauge {
    g := &gauge{
        name: name,		
    }
    c.m.Lock()
    defer c.m.Unlock()
    c.gauges = append(c.gauges, g)
    return g
}

func (c *config) Delimiter() *string {
    // use default delimiter
    return nil
}

func (c *config) Prefix() *string {
    // nothing prefix
    return nil
}

func (c *config) Name(Type) *string {
    // use default metric names
    return nil
}

func (c *config) Join(...Name) *string {
    // use default join
    return nil
}

func (c *config) ErrName(err error) *string {
    // use default error name func
    return nil
}

func main() {
    registry := &config{
        gauges: make([]gauge, 0),
    }
    // print registry values 
    go func() {
        for {
            time.Sleep(time.Minute)
            registry.m.Lock()
            fmt.Printf("[%s] registry state:\n", time.Now().String())
            for _, g := range registry.gauges {
                fmt.Printf(" - %s = %f\n", g.name, g.Value())
            }
            registry.m.Lock()
        }
    }
    db, err := ydb.New(
        context.Background(),
		ydb.MustConnectionString(connection),
		ydb.WithTraceDriver(metrics.Driver(registry))
	)
    // work with db
}

Documentation

Index

• func Coordination(c registry.Config) (t trace.Coordination)
• func Discovery(c registry.Config) (t trace.Discovery)
• func Driver(c registry.Config) (t trace.Driver)
• func Ratelimiter(c registry.Config) (t trace.Ratelimiter)
• func Retry(c registry.Config) (t trace.Retry)
• func Scheme(c registry.Config) (t trace.Scheme)
• func Scripting(c registry.Config) (t trace.Scripting)
• func Table(c config2.Config) (t trace.Table)
• func WithTraces(c registry.Config) ydb.Option

Functions

func Coordination

func Coordination(c registry.Config) (t trace.Coordination)

func Discovery

func Discovery(c registry.Config) (t trace.Discovery)

func Driver

func Driver(c registry.Config) (t trace.Driver)

Driver makes Driver with New publishing

func Ratelimiter

func Ratelimiter(c registry.Config) (t trace.Ratelimiter)

func Retry

func Retry(c registry.Config) (t trace.Retry)

Retry makes table.RetryTrace with New publishing

func Scheme

func Scheme(c registry.Config) (t trace.Scheme)

func Scripting

func Scripting(c registry.Config) (t trace.Scripting)

func Table

func Table(c config2.Config) (t trace.Table)

func WithTraces

func WithTraces(c registry.Config) ydb.Option