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|
package handlers
import (
"bytes"
"context"
"crypto/rand"
"encoding/hex"
"errors"
"fmt"
"log"
"net/http"
"net/url"
"path"
"strconv"
"time"
"github.com/coreos/discovery.etcd.io/handlers/httperror"
"github.com/coreos/etcd/client"
"github.com/prometheus/client_golang/prometheus"
)
var newCounter *prometheus.CounterVec
func init() {
newCounter = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "endpoint_new_requests_total",
Help: "How many /new requests processed, partitioned by status code and HTTP method.",
},
[]string{"code", "method"},
)
prometheus.MustRegister(newCounter)
}
func generateCluster() string {
b := make([]byte, 16)
_, err := rand.Read(b)
if err != nil {
return ""
}
return hex.EncodeToString(b)
}
func Setup(etcdCURL, disc string) *State {
u, _ := url.Parse(etcdCURL)
return &State{
etcdHost: etcdCURL,
etcdCURL: u,
currentLeader: u.Host,
discHost: disc,
}
}
func (st *State) setupToken(size int) (string, error) {
token := generateCluster()
if token == "" {
return "", errors.New("Couldn't generate a token")
}
c, _ := client.New(client.Config{
Endpoints: []string{st.endpoint()},
Transport: client.DefaultTransport,
// set timeout per request to fail fast when the target endpoint is unavailable
HeaderTimeoutPerRequest: time.Second,
})
kapi := client.NewKeysAPI(c)
key := path.Join("_etcd", "registry", token)
resp, err := kapi.Create(context.Background(), path.Join(key, "_config", "size"), strconv.Itoa(size))
if err != nil {
return "", fmt.Errorf("Couldn't setup state %v %v", resp, err)
}
return token, nil
}
func (st *State) deleteToken(token string) error {
c, _ := client.New(client.Config{
Endpoints: []string{st.endpoint()},
Transport: client.DefaultTransport,
// set timeout per request to fail fast when the target endpoint is unavailable
HeaderTimeoutPerRequest: time.Second,
})
kapi := client.NewKeysAPI(c)
if token == "" {
return errors.New("No token given")
}
_, err := kapi.Delete(
context.Background(),
path.Join("_etcd", "registry", token),
&client.DeleteOptions{Recursive: true},
)
return err
}
func NewTokenHandler(ctx context.Context, w http.ResponseWriter, r *http.Request) {
st := ctx.Value(stateKey).(*State)
var err error
size := 3
s := r.FormValue("size")
if s != "" {
size, err = strconv.Atoi(s)
if err != nil {
httperror.Error(w, r, err.Error(), http.StatusBadRequest, newCounter)
return
}
}
token, err := st.setupToken(size)
if err != nil {
log.Printf("setupToken returned: %v", err)
httperror.Error(w, r, "Unable to generate token", 400, newCounter)
return
}
log.Println("New cluster created", token)
fmt.Fprintf(w, "%s/%s", bytes.TrimRight([]byte(st.discHost), "/"), token)
newCounter.WithLabelValues("200", r.Method).Add(1)
}
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