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quickmetrics.go
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quickmetrics.go
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package qm
import (
"encoding/json"
"log"
"sync"
"time"
"github.com/valyala/fasthttp"
)
const (
authHeader = "x-qm-key"
ingestEndpoint = "https://in.qckm.io/v2/events"
queryEndpoint = "https://api.quickmetrics.io/v2/query"
)
var clientKey *string
var isEnabled bool
var isVerbose bool
// initialization options
type Options struct {
ApiKey string
MaxBatchSize int
MaxBatchWait time.Duration
BatchWorkers int
Verbose bool
}
// event holds a single event
// ready to be sent to the qckm server
type event struct {
Name string `json:"name"`
Fields map[string]interface{} `json:"data"`
}
type Fields map[string]interface{}
var batcher *batch
var httpClient *fasthttp.Client
var httpQueryClient *fasthttp.Client
func Init(opt Options) {
clientKey = &opt.ApiKey
isEnabled = true
isVerbose = opt.Verbose
batcher = newBatcher(opt.MaxBatchSize, opt.MaxBatchWait, opt.BatchWorkers)
httpClient = &fasthttp.Client{
Name: "go-qckm",
MaxConnWaitTimeout: 15 * time.Second,
WriteTimeout: 15 * time.Second,
ReadTimeout: time.Second,
}
httpQueryClient = &fasthttp.Client{
Name: "go-qckm",
MaxConnWaitTimeout: 15 * time.Second,
WriteTimeout: 15 * time.Second,
ReadTimeout: 5 * time.Minute,
}
}
func SetEnabled(enable bool) {
isEnabled = enable
}
// Event sends an event with a name and optional fields
func Event(name string, fields map[string]interface{}) {
if isEnabled {
batcher.add(event{
Name: name,
Fields: fields,
})
}
}
// FlushEvents processes any events left in the queue
// and sends them to the qickmetrics server.
func FlushEvents() {
batcher.flush()
}
// FlushEventsSync processes any events left in the queue
// and sends them to the qickmetrics server. This function
// is blocking until events are sent to ensure that the system
// doesn't shut down before then
func FlushEventsSync() {
// flush any pending items to process them
batcher.flush()
// wait for all processing and network to finish
batcher.wait()
}
func processBatch(ee []event, wg *sync.WaitGroup) {
sendBatch(ee)
// let waitgroup know we're done with these events
for i := 0; i < len(ee); i++ {
wg.Done()
}
}
func sendBatch(ee []event) {
if clientKey == nil || *clientKey == "" {
log.Println("[ERROR] missing api key, please run qm.Init() first")
return
}
body, _ := json.Marshal(ee)
req := fasthttp.AcquireRequest()
defer fasthttp.ReleaseRequest(req)
req.SetRequestURI(ingestEndpoint)
req.Header.SetMethod("POST")
req.Header.SetContentType("application/json")
req.Header.Set(authHeader, *clientKey)
req.SetBody(body)
resp := fasthttp.AcquireResponse()
defer fasthttp.ReleaseResponse(resp)
resp.SkipBody = !isVerbose
start := time.Now()
httpClient.Do(req, resp)
if isVerbose {
if resp != nil {
log.Printf(
`[INFO] Request Finished in %vms. endpoint: "%v" status: %v addr: %v body: "%v"`,
time.Since(start).Milliseconds(),
req.URI(),
resp.StatusCode(),
resp.RemoteAddr(),
string(resp.Body()),
)
}
}
}