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main.go
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main.go
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package main
import (
"context"
"crypto/tls"
"flag"
"net"
"net/http"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/coreos/go-semver/semver"
"github.com/fnproject/fn/fnlb/lb"
"github.com/sirupsen/logrus"
)
const VERSION = "0.0.107"
func main() {
// XXX (reed): normalize
fnodes := flag.String("nodes", "", "comma separated list of functions nodes")
minAPIVersion := flag.String("min-api-version", "0.0.74", "minimal node API to accept")
var conf lb.Config
flag.StringVar(&conf.DBurl, "db", "sqlite3://:memory:", "backend to store nodes, default to in memory")
flag.StringVar(&conf.Listen, "listen", ":8081", "port to run on")
flag.IntVar(&conf.HealthcheckInterval, "hc-interval", 3, "how often to check f(x) nodes, in seconds")
flag.StringVar(&conf.HealthcheckEndpoint, "hc-path", "/version", "endpoint to determine node health")
flag.IntVar(&conf.HealthcheckUnhealthy, "hc-unhealthy", 2, "threshold of failed checks to declare node unhealthy")
flag.IntVar(&conf.HealthcheckTimeout, "hc-timeout", 5, "timeout of healthcheck endpoint, in seconds")
flag.StringVar(&conf.ZipkinURL, "zipkin", "", "zipkin endpoint to send traces")
flag.Parse()
conf.MinAPIVersion = semver.New(*minAPIVersion)
if len(*fnodes) > 0 {
// starting w/o nodes is fine too
conf.Nodes = strings.Split(*fnodes, ",")
}
conf.Transport = &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 10 * time.Second,
KeepAlive: 120 * time.Second,
}).Dial,
MaxIdleConnsPerHost: 512,
TLSHandshakeTimeout: 10 * time.Second,
TLSClientConfig: &tls.Config{
ClientSessionCache: tls.NewLRUClientSessionCache(4096),
},
}
g, err := lb.NewAllGrouper(conf)
if err != nil {
logrus.WithError(err).Fatal("error setting up grouper")
}
r := lb.NewConsistentRouter(conf)
k := func(r *http.Request) (string, error) {
return r.URL.Path, nil
}
h := lb.NewProxy(k, g, r, conf)
h = g.Wrap(h) // add/del/list endpoints
h = r.Wrap(h) // stats / dash endpoint
err = serve(conf.Listen, h)
if err != nil {
logrus.WithError(err).Fatal("server error")
}
}
func serve(addr string, handler http.Handler) error {
server := &http.Server{Addr: addr, Handler: handler}
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGQUIT, syscall.SIGINT)
go func() {
for sig := range ch {
logrus.WithFields(logrus.Fields{"signal": sig}).Info("received signal")
server.Shutdown(context.Background()) // safe shutdown
return
}
}()
return server.ListenAndServe()
}