/
stream.go
205 lines (171 loc) · 3.93 KB
/
stream.go
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package main
import (
"compress/gzip"
"encoding/json"
"flag"
"fmt"
"io"
"log"
"net/http"
"os"
"strings"
"time"
)
type Tweet struct {
Sender struct {
User string `json:"screen_name"`
Name string
} `json:"user"`
Text string
}
const qtimeFormat = "150405:"
const ptimeFormat = "20060102T150405"
const cPrefix = "c:"
const lPrefix = "l:"
const max_entries = 1000
const max_word_len = 32
var windowSize = flag.Duration("interval", time.Second*30, "Reporting interval")
var numWorkers = flag.Int("workers", 8, "Number of workers")
var recordTo = flag.String("record", "", "Record the stream to a file")
var multiplier = flag.Int("multiplier", 1, "Tweet multiplier")
var mcServer = flag.String("memcached", "localhost:11211",
"host:port of your memcached server")
var foreverWords = flag.Bool("forever", false, "Keep \"forever\" counters")
func parseNext(d *json.Decoder) (rv Tweet, err error) {
err = d.Decode(&rv)
return
}
func handle(ch <-chan Tweet, pch <-chan string) {
client, err := getPersister(*mcServer)
if err != nil {
log.Fatalf("Error getting persister: %v", err)
}
defer client.Close()
prefix := ""
for {
select {
case prefix = <-pch:
case t := <-ch:
if t.Text != "" {
process(client, prefix, &t)
}
}
}
}
func moveTime(listeners []chan string) {
var currentPrefix string
for {
t := time.Now().Unix()
t = t - (t % int64(windowSize.Seconds()))
oldPrefix := currentPrefix
currentWindow := time.Unix(t, 0)
currentPrefix = currentWindow.Format(qtimeFormat)
for _, ch := range listeners {
ch <- currentPrefix
}
if oldPrefix != "" {
report(oldPrefix)
}
next := time.Unix(t, 0).Add(*windowSize)
toSleep := next.Sub(time.Now())
time.Sleep(toSleep)
}
}
func openStream(path string) (io.ReadCloser, error) {
if strings.HasPrefix(path, "http://") || strings.HasPrefix(path, "https://") {
req, err := http.NewRequest("GET", path, nil)
if err != nil {
return nil, err
}
req.Header.Set("Accept-Encoding", "gzip")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
gz, err := gzip.NewReader(resp.Body)
if err != nil {
resp.Body.Close()
return nil, err
}
return gz, nil
} else {
f, err := os.Open(path)
if err != nil {
return nil, err
}
gz, err := gzip.NewReader(f)
if err != nil {
f.Close()
return nil, err
}
return gz, nil
}
panic("Unreachable")
}
func usage() {
fmt.Fprintf(os.Stderr, "Usage: %s [flags] src\n", os.Args[0])
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, "\nsrc can be a path to a local file, or a URL, e.g.\n")
fmt.Fprintf(os.Stderr, " https://user:pass@stream.twitter.com/1/statuses/sample.json\n")
os.Exit(1)
}
func streamTo(path string, ch chan<- Tweet) {
stream, err := openStream(path)
if err != nil {
log.Printf("Error opening stream: %v", err)
return
}
defer stream.Close()
var r io.Reader = stream
if *recordTo != "" {
f, err := os.OpenFile(*recordTo,
os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
if err != nil {
log.Printf("Error opening output stream: %v", err)
return
}
defer f.Close()
r = io.TeeReader(stream, f)
}
d := json.NewDecoder(r)
for {
tweet, err := parseNext(d)
if err != nil {
log.Printf("Error in stream: %v", err)
return
}
for i := 0; i < *multiplier; i++ {
ch <- tweet
}
}
}
func main() {
log.SetFlags(log.Lmicroseconds)
flag.Usage = usage
flag.Parse()
var streamPath string
if flag.NArg() < 1 {
usage()
} else {
streamPath = flag.Arg(0)
}
listenerChans := make([]chan string, *numWorkers)
for i := 0; i < *numWorkers; i++ {
listenerChans[i] = make(chan string)
}
go moveTime(listenerChans)
ch := make(chan Tweet, 1000)
for _, lch := range listenerChans {
go handle(ch, lch)
}
for {
start := time.Now()
streamTo(streamPath, ch)
if time.Since(start).Seconds() < 5 {
log.Printf("Crashed in %v, slowing down",
time.Since(start))
time.Sleep(time.Second * 5)
}
log.Printf("Restarting stream")
}
}