sdk

Cat client for golang (v2)

gocat.v2 is the client sdk for the CAT(Central Application Tracking) for the Go programming language.

See the DIFFERENCES between gocat and gocat.v2

The sdk requires a minimum version of Go 1.8

The current latest version is 2.0.0

Please check CHANGELOG for information about our latest updates to the sdk.

Installation

You can simply get started with our sdk by using the following command:

go get github.com/Meituan-Dianping/cat-go

Quickstart

This example shows how you can send tracking data to CAT using gocat.v2.

package main

import (
	"errors"
	"math/rand"
	"sync"
	"time"

	"github.com/Meituan-Dianping/cat-go/cat"
)

const TestType = "foo"

var wg = sync.WaitGroup{}

func init() {
	cat.DebugOn()
	cat.Init("gocat.v2")
}

// send transaction
func case1() {
	t := cat.NewTransaction(TestType, "test")
	defer t.Complete()

	if rand.Int31n(100) == 0 {
		t.SetStatus(cat.FAIL)
	}

	t.AddData("foo", "bar")

	t.NewEvent(TestType, "event-1")
	t.Complete()

	if rand.Int31n(100) == 0 {
		t.LogEvent(TestType, "event-2", cat.FAIL)
	} else {
		t.LogEvent(TestType, "event-2")
	}
	t.LogEvent(TestType, "event-3", cat.SUCCESS, "k=v")

	t.SetDurationStart(time.Now().Add(-5 * time.Second))
	t.SetTime(time.Now().Add(-5 * time.Second))
	t.SetDuration(time.Millisecond * 500)
}

// send completed transaction with duration
func case2() {
	cat.NewCompletedTransactionWithDuration(TestType, "completed", time.Second*24)
	cat.NewCompletedTransactionWithDuration(TestType, "completed-over-60s", time.Second*65)
}

// send event
func case3() {
	// way 1
	e := cat.NewEvent(TestType, "event-4")
	e.Complete()
	// way 2

	if rand.Int31n(100) == 0 {
		cat.LogEvent(TestType, "event-5", cat.FAIL)
	} else {
		cat.LogEvent(TestType, "event-5")
	}
	cat.LogEvent(TestType, "event-6", cat.SUCCESS, "foobar")
}

// send error with backtrace
func case4() {
	if rand.Int31n(100) == 0 {
		err := errors.New("error")
		cat.LogError(err)
	}
}

// send metric
func case5() {
	cat.LogMetricForCount("metric-1")
	cat.LogMetricForCount("metric-2", 3)
	cat.LogMetricForDuration("metric-3", 150*time.Millisecond)
	cat.NewMetricHelper("metric-4").Count(7)
	cat.NewMetricHelper("metric-5").Duration(time.Second)
}

func run(f func()) {
	defer wg.Done()

	for i := 0; i < 100000000; i++ {
		f()
		time.Sleep(time.Microsecond * 100)
	}
}

func start(f func()) {
	wg.Add(1)
	go run(f)
}

func main() {
	start(case1)
	start(case2)
	start(case3)
	start(case4)
	start(case5)

	wg.Wait()

	cat.Shutdown()
}

License

This SDK is distributed under the Apache License, Version 2.0,