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cbfsseriesly.go
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cbfsseriesly.go
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package main
import (
"flag"
"log"
"net/http"
"net/url"
"strconv"
"sync"
"time"
"github.com/couchbaselabs/cbfs/client"
"github.com/dustin/httputil"
)
var cbfsUrlFlag = flag.String("cbfs", "http://cbfs:8484/", "URL to cbfs base")
var serieslyUrlFlag = flag.String("seriesly", "http://seriesly:3133/",
"URL to seriesly base")
var pollFreq = flag.Duration("freq", 5*time.Second, "How often to poll cbfs")
var cbfsUrl, serieslyUrl *url.URL
var client *cbfsclient.Client
var nodeLock sync.Mutex
var nodes map[string]cbfsclient.StorageNode
func updateNodes() {
nodeLock.Lock()
defer nodeLock.Unlock()
n, err := client.Nodes()
lf := log.Printf
if nodes == nil {
lf = log.Fatalf
}
if err != nil {
lf("Couldn't update/init nodes: %v", err)
return
}
if len(n) != len(nodes) {
createDatabases(n)
}
nodes = n
}
func createDatabases(m map[string]cbfsclient.StorageNode) {
for k := range m {
du := *serieslyUrl
du.Path = "/" + k
req, err := http.NewRequest("PUT", du.String(), nil)
if err != nil {
log.Fatalf("Error creating DB %q: %v", k, err)
}
res, err := http.DefaultClient.Do(req)
if err != nil {
log.Printf("Error issuing HTTP request: %v", err)
return
}
defer res.Body.Close()
if res.StatusCode != 201 {
log.Printf("Error creating db: %v", res.Status)
}
}
}
func updateNodesLoop() {
updateNodes()
for _ = range time.Tick(time.Minute) {
updateNodes()
}
}
func httpCopy(dest, src string) error {
sres, err := http.Get(src)
if err != nil {
return err
}
defer sres.Body.Close()
if sres.StatusCode != 200 {
return httputil.HTTPErrorf(sres, "error copying from %v: S\n%B", src)
}
dres, err := http.Post(dest, sres.Header.Get("Content-Type"), sres.Body)
if err != nil {
return err
}
defer dres.Body.Close()
if dres.StatusCode != 201 {
return httputil.HTTPErrorf(dres, "Error posting result to %v: %S\n%B",
dest)
}
return nil
}
func pollNode(name string, node cbfsclient.StorageNode, t time.Time) {
du := *serieslyUrl
du.RawQuery = "ts=" + strconv.FormatInt(t.UnixNano(), 10)
du.Path = "/" + name
if err := httpCopy(du.String(), node.URLFor("/.cbfs/debug/")); err != nil {
log.Printf("Error copying data: %v", err)
}
}
func poll(t time.Time) {
for k, v := range nodes {
go pollNode(k, v, t)
}
}
func mustParseUrl(ustr string) *url.URL {
u, e := url.Parse(ustr)
if e != nil {
log.Fatalf("Error parsing URL %q: %v", ustr, e)
}
return u
}
func parseUrls() {
cbfsUrl = mustParseUrl(*cbfsUrlFlag)
serieslyUrl = mustParseUrl(*serieslyUrlFlag)
}
func initHttp() {
http.DefaultClient = &http.Client{
Transport: &http.Transport{
DisableKeepAlives: true,
ResponseHeaderTimeout: time.Millisecond * 100,
},
}
}
func main() {
flag.Parse()
initHttp()
parseUrls()
var err error
client, err = cbfsclient.New(cbfsUrl.String())
if err != nil {
log.Fatalf("Can't instantiate cbfsclient: %v", err)
}
go updateNodesLoop()
for t := range time.Tick(*pollFreq) {
poll(t)
}
}