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stathat.go
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stathat.go
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// Copyright (C) 2012 Numerotron Inc.
// Use of this source code is governed by an MIT-style license
// that can be found in the LICENSE file.
// Copyright 2012 Numerotron Inc.
// Use of this source code is governed by an MIT-style license
// that can be found in the LICENSE file.
//
// Developed at www.stathat.com by Patrick Crosby
// Contact us on twitter with any questions: twitter.com/stat_hat
// The stathat package makes it easy to post any values to your StatHat
// account.
package stathat
import (
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"strconv"
"sync"
"time"
)
const hostname = "api.stathat.com"
type statKind int
const (
_ = iota
kcounter statKind = iota
kvalue
)
func (sk statKind) classicPath() string {
switch sk {
case kcounter:
return "/c"
case kvalue:
return "/v"
}
return ""
}
type apiKind int
const (
_ = iota
classic apiKind = iota
ez
)
func (ak apiKind) path(sk statKind) string {
switch ak {
case ez:
return "/ez"
case classic:
return sk.classicPath()
}
return ""
}
type statReport struct {
StatKey string
UserKey string
Value float64
Timestamp int64
statType statKind
apiType apiKind
}
// Reporter is a StatHat client that can report stat values/counts to the servers.
type Reporter struct {
reports chan *statReport
done chan bool
client *http.Client
wg *sync.WaitGroup
}
// NewReporter returns a new Reporter. You must specify the channel bufferSize and the
// goroutine poolSize. You can pass in nil for the transport and it will use the
// default http transport.
func NewReporter(bufferSize, poolSize int, transport http.RoundTripper) *Reporter {
r := new(Reporter)
r.client = &http.Client{Transport: transport}
r.reports = make(chan *statReport, bufferSize)
r.done = make(chan bool)
r.wg = new(sync.WaitGroup)
for i := 0; i < poolSize; i++ {
r.wg.Add(1)
go r.processReports()
}
return r
}
// DefaultReporter is the default instance of *Reporter.
var DefaultReporter = NewReporter(100000, 10, nil)
var testingEnv = false
type testPost struct {
url string
values url.Values
}
var testPostChannel chan *testPost
// The Verbose flag determines if the package should write verbose output to stdout.
var Verbose = false
func setTesting() {
testingEnv = true
testPostChannel = make(chan *testPost)
}
func newEZStatCount(statName, ezkey string, count int) *statReport {
return &statReport{StatKey: statName,
UserKey: ezkey,
Value: float64(count),
statType: kcounter,
apiType: ez}
}
func newEZStatValue(statName, ezkey string, value float64) *statReport {
return &statReport{StatKey: statName,
UserKey: ezkey,
Value: value,
statType: kvalue,
apiType: ez}
}
func newClassicStatCount(statKey, userKey string, count int) *statReport {
return &statReport{StatKey: statKey,
UserKey: userKey,
Value: float64(count),
statType: kcounter,
apiType: classic}
}
func newClassicStatValue(statKey, userKey string, value float64) *statReport {
return &statReport{StatKey: statKey,
UserKey: userKey,
Value: value,
statType: kvalue,
apiType: classic}
}
func (sr *statReport) values() url.Values {
switch sr.apiType {
case ez:
return sr.ezValues()
case classic:
return sr.classicValues()
}
return nil
}
func (sr *statReport) ezValues() url.Values {
switch sr.statType {
case kcounter:
return sr.ezCounterValues()
case kvalue:
return sr.ezValueValues()
}
return nil
}
func (sr *statReport) classicValues() url.Values {
switch sr.statType {
case kcounter:
return sr.classicCounterValues()
case kvalue:
return sr.classicValueValues()
}
return nil
}
func (sr *statReport) ezCommonValues() url.Values {
result := make(url.Values)
result.Set("stat", sr.StatKey)
result.Set("ezkey", sr.UserKey)
if sr.Timestamp > 0 {
result.Set("t", sr.timeString())
}
return result
}
func (sr *statReport) classicCommonValues() url.Values {
result := make(url.Values)
result.Set("key", sr.StatKey)
result.Set("ukey", sr.UserKey)
if sr.Timestamp > 0 {
result.Set("t", sr.timeString())
}
return result
}
func (sr *statReport) ezCounterValues() url.Values {
result := sr.ezCommonValues()
result.Set("count", sr.valueString())
return result
}
func (sr *statReport) ezValueValues() url.Values {
result := sr.ezCommonValues()
result.Set("value", sr.valueString())
return result
}
func (sr *statReport) classicCounterValues() url.Values {
result := sr.classicCommonValues()
result.Set("count", sr.valueString())
return result
}
func (sr *statReport) classicValueValues() url.Values {
result := sr.classicCommonValues()
result.Set("value", sr.valueString())
return result
}
func (sr *statReport) valueString() string {
return strconv.FormatFloat(sr.Value, 'g', -1, 64)
}
func (sr *statReport) timeString() string {
return strconv.FormatInt(sr.Timestamp, 10)
}
func (sr *statReport) path() string {
return sr.apiType.path(sr.statType)
}
func (sr *statReport) url() string {
return fmt.Sprintf("http://%s%s", hostname, sr.path())
}
// Using the classic API, posts a count to a stat using DefaultReporter.
func PostCount(statKey, userKey string, count int) error {
return DefaultReporter.PostCount(statKey, userKey, count)
}
// Using the classic API, posts a count to a stat using DefaultReporter at a specific
// time.
func PostCountTime(statKey, userKey string, count int, timestamp int64) error {
return DefaultReporter.PostCountTime(statKey, userKey, count, timestamp)
}
// Using the classic API, posts a count of 1 to a stat using DefaultReporter.
func PostCountOne(statKey, userKey string) error {
return DefaultReporter.PostCountOne(statKey, userKey)
}
// Using the classic API, posts a value to a stat using DefaultReporter.
func PostValue(statKey, userKey string, value float64) error {
return DefaultReporter.PostValue(statKey, userKey, value)
}
// Using the classic API, posts a value to a stat at a specific time using DefaultReporter.
func PostValueTime(statKey, userKey string, value float64, timestamp int64) error {
return DefaultReporter.PostValueTime(statKey, userKey, value, timestamp)
}
// Using the EZ API, posts a count of 1 to a stat using DefaultReporter.
func PostEZCountOne(statName, ezkey string) error {
return DefaultReporter.PostEZCountOne(statName, ezkey)
}
// Using the EZ API, posts a count to a stat using DefaultReporter.
func PostEZCount(statName, ezkey string, count int) error {
return DefaultReporter.PostEZCount(statName, ezkey, count)
}
// Using the EZ API, posts a count to a stat at a specific time using DefaultReporter.
func PostEZCountTime(statName, ezkey string, count int, timestamp int64) error {
return DefaultReporter.PostEZCountTime(statName, ezkey, count, timestamp)
}
// Using the EZ API, posts a value to a stat using DefaultReporter.
func PostEZValue(statName, ezkey string, value float64) error {
return DefaultReporter.PostEZValue(statName, ezkey, value)
}
// Using the EZ API, posts a value to a stat at a specific time using DefaultReporter.
func PostEZValueTime(statName, ezkey string, value float64, timestamp int64) error {
return DefaultReporter.PostEZValueTime(statName, ezkey, value, timestamp)
}
// Wait for all stats to be sent, or until timeout. Useful for simple command-
// line apps to defer a call to this in main()
func WaitUntilFinished(timeout time.Duration) bool {
return DefaultReporter.WaitUntilFinished(timeout)
}
// Using the classic API, posts a count to a stat.
func (r *Reporter) PostCount(statKey, userKey string, count int) error {
r.reports <- newClassicStatCount(statKey, userKey, count)
return nil
}
// Using the classic API, posts a count to a stat at a specific time.
func (r *Reporter) PostCountTime(statKey, userKey string, count int, timestamp int64) error {
x := newClassicStatCount(statKey, userKey, count)
x.Timestamp = timestamp
r.reports <- x
return nil
}
// Using the classic API, posts a count of 1 to a stat.
func (r *Reporter) PostCountOne(statKey, userKey string) error {
return r.PostCount(statKey, userKey, 1)
}
// Using the classic API, posts a value to a stat.
func (r *Reporter) PostValue(statKey, userKey string, value float64) error {
r.reports <- newClassicStatValue(statKey, userKey, value)
return nil
}
// Using the classic API, posts a value to a stat at a specific time.
func (r *Reporter) PostValueTime(statKey, userKey string, value float64, timestamp int64) error {
x := newClassicStatValue(statKey, userKey, value)
x.Timestamp = timestamp
r.reports <- x
return nil
}
// Using the EZ API, posts a count of 1 to a stat.
func (r *Reporter) PostEZCountOne(statName, ezkey string) error {
return r.PostEZCount(statName, ezkey, 1)
}
// Using the EZ API, posts a count to a stat.
func (r *Reporter) PostEZCount(statName, ezkey string, count int) error {
r.reports <- newEZStatCount(statName, ezkey, count)
return nil
}
// Using the EZ API, posts a count to a stat at a specific time.
func (r *Reporter) PostEZCountTime(statName, ezkey string, count int, timestamp int64) error {
x := newEZStatCount(statName, ezkey, count)
x.Timestamp = timestamp
r.reports <- x
return nil
}
// Using the EZ API, posts a value to a stat.
func (r *Reporter) PostEZValue(statName, ezkey string, value float64) error {
r.reports <- newEZStatValue(statName, ezkey, value)
return nil
}
// Using the EZ API, posts a value to a stat at a specific time.
func (r *Reporter) PostEZValueTime(statName, ezkey string, value float64, timestamp int64) error {
x := newEZStatValue(statName, ezkey, value)
x.Timestamp = timestamp
r.reports <- x
return nil
}
func (r *Reporter) processReports() {
for {
sr, ok := <-r.reports
if !ok {
if Verbose {
log.Printf("channel closed, stopping processReports()")
}
break
}
if Verbose {
log.Printf("posting stat to stathat: %s, %v", sr.url(), sr.values())
}
if testingEnv {
if Verbose {
log.Printf("in test mode, putting stat on testPostChannel")
}
testPostChannel <- &testPost{sr.url(), sr.values()}
continue
}
resp, err := r.client.PostForm(sr.url(), sr.values())
if err != nil {
log.Printf("error posting stat to stathat: %s", err)
continue
}
if Verbose {
body, _ := ioutil.ReadAll(resp.Body)
log.Printf("stathat post result: %s", body)
}
resp.Body.Close()
}
r.wg.Done()
}
func (r *Reporter) finish() {
close(r.reports)
r.wg.Wait()
r.done <- true
}
// Wait for all stats to be sent, or until timeout. Useful for simple command-
// line apps to defer a call to this in main()
func (r *Reporter) WaitUntilFinished(timeout time.Duration) bool {
go r.finish()
select {
case <-r.done:
return true
case <-time.After(timeout):
return false
}
return false
}