forked from ryandotsmith/l2met
/
main.go
213 lines (189 loc) · 5.15 KB
/
main.go
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package main
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"l2met/store"
"l2met/utils"
"net/http"
"os"
"regexp"
"runtime"
"strconv"
"sync"
"time"
)
var (
metricsPat = regexp.MustCompile(`\/metrics\/(.*)\??`)
workers int
port string
registerLocker sync.Mutex
numPartitions uint64
reqBuffer int
flushInterval int
)
func init() {
runtime.GOMAXPROCS(runtime.NumCPU())
port = utils.EnvString("PORT", "8000")
workers = utils.EnvInt("LOCAL_WORKERS", 2)
reqBuffer = utils.EnvInt("REQUEST_BUFFER", 1000)
flushInterval = utils.EnvInt("FLUSH_INTERVAL", 1)
numPartitions = utils.EnvUint64("NUM_OUTLET_PARTITIONS", 1)
}
type LogRequest struct {
Token string
Body []byte
}
func main() {
fmt.Printf("at=start-l2met port=%s\n", port)
register := make(map[store.BKey]*store.Bucket)
inbox := make(chan *LogRequest, reqBuffer)
outbox := make(chan *store.Bucket, reqBuffer)
go report(inbox, outbox, register)
for i := 0; i < workers; i++ {
go accept(inbox, register)
}
go transfer(register, outbox)
for i := 0; i < workers; i++ {
go outlet(outbox)
}
receiver := func(w http.ResponseWriter, r *http.Request) { receiveLogs(w, r, inbox) }
http.HandleFunc("/health", healthCheck)
http.HandleFunc("/logs", receiver)
http.HandleFunc("/metrics/", getMetrics)
err := http.ListenAndServe(":"+port, nil)
if err != nil {
fmt.Printf("at=error error=\"Unable to start http server.\"\n")
os.Exit(1)
}
}
func healthCheck(w http.ResponseWriter, r *http.Request) {
var err error
err = store.PingRedis()
if err != nil {
fmt.Printf("error=%q\n", err)
http.Error(w, "Redis is unavailable.", 500)
}
/*
err = store.PingPostgres()
if err != nil {
fmt.Printf("error=%q\n", err)
http.Error(w, "Postgres is unavailable.", 500)
}
*/
}
func report(inbox chan *LogRequest, outbox chan *store.Bucket, register map[store.BKey]*store.Bucket) {
for _ = range time.Tick(time.Second * 2) {
utils.MeasureI("web.inbox", int64(len(inbox)))
utils.MeasureI("web.register", int64(len(register)))
utils.MeasureI("web.outbox", int64(len(outbox)))
}
}
func receiveLogs(w http.ResponseWriter, r *http.Request, inbox chan<- *LogRequest) {
defer utils.MeasureT("http-receiver", time.Now())
if r.Method != "POST" {
http.Error(w, "Invalid Request", 400)
return
}
token, err := utils.ParseToken(r)
if err != nil {
http.Error(w, "Invalid Request", 400)
return
}
b, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, "Invalid Request", 400)
r.Body.Close()
return
}
r.Body.Close()
inbox <- &LogRequest{token, b}
}
func accept(inbox <-chan *LogRequest, register map[store.BKey]*store.Bucket) {
for lreq := range inbox {
rdr := bufio.NewReader(bytes.NewReader(lreq.Body))
for bucket := range store.NewBucket(lreq.Token, rdr) {
registerLocker.Lock()
k := bucket.Key
_, present := register[k]
if !present {
fmt.Printf("at=%q minute=%d name=%s\n",
"add-to-register", bucket.Key.Time.Minute(), bucket.Key.Name)
register[k] = bucket
} else {
register[k].Add(bucket)
}
registerLocker.Unlock()
}
}
}
func transfer(register map[store.BKey]*store.Bucket, outbox chan<- *store.Bucket) {
for _ = range time.Tick(time.Second * time.Duration(flushInterval)) {
for k := range register {
registerLocker.Lock()
if m, ok := register[k]; ok {
delete(register, k)
registerLocker.Unlock()
outbox <- m
} else {
registerLocker.Unlock()
}
}
}
}
func outlet(outbox <-chan *store.Bucket) {
for b := range outbox {
err := b.Put(numPartitions)
if err != nil {
fmt.Printf("error=%s\n", err)
}
}
}
func getMetrics(w http.ResponseWriter, r *http.Request) {
defer utils.MeasureT("http-metrics", time.Now())
// Support CORS.
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Headers", "Authorization")
w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
if r.Method == "OPTIONS" {
return
}
names := metricsPat.FindStringSubmatch(r.URL.Path)
if len(names) < 2 {
fmt.Printf("at=error error=%q\n", "Name parameter not provided.")
errmsg := map[string]string{"error": "Name parameter not provided."}
utils.WriteJson(w, 401, errmsg)
return
}
name := names[1]
token, err := utils.ParseToken(r)
if err != nil {
fmt.Printf("at=error error=%q\n", err)
errmsg := map[string]string{"error": "Missing authorization."}
utils.WriteJson(w, 401, errmsg)
return
}
q := r.URL.Query()
limit, err := strconv.ParseInt(q.Get("limit"), 10, 32)
if err != nil {
errmsg := map[string]string{"error": "Missing limit parameter."}
utils.WriteJson(w, 400, errmsg)
return
}
resolution, err := strconv.ParseInt(q.Get("resolution"), 10, 32)
if err != nil {
errmsg := map[string]string{"error": "Missing resolution parameter."}
utils.WriteJson(w, 400, errmsg)
return
}
max := utils.RoundTime(time.Now(), (time.Minute * time.Duration(resolution)))
min := max.Add(-1 * time.Minute * time.Duration(limit*resolution))
metrics, err := store.GetMetrics(token, name, resolution, min, max)
if err != nil {
errmsg := map[string]string{"error": "Unable to find metrics."}
utils.WriteJson(w, 500, errmsg)
return
}
utils.WriteJson(w, 200, metrics)
}