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main.go
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main.go
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// Copyright 2020 University at Buffalo. All rights reserved.
//
// This file is part of SlurmExporter.
//
// SlurmExporter is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// SlurmExporter is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with SlurmExporter. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"bytes"
"context"
"fmt"
"net"
"net/http"
"net/url"
"os"
"os/exec"
"os/user"
"regexp"
"strings"
"time"
kingpin "github.com/alecthomas/kingpin/v2"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"github.com/prometheus/common/version"
"github.com/ubccr/slurmrest"
)
var (
listenAddress = kingpin.Flag(
"listen-address",
"Address on which to expose metrics and web interface.",
).Default(":9122").String()
unixSocket = kingpin.Flag(
"unix-socket",
"Path to slurmrestd unix socket.",
).Default("/tmp/slurmrestd.sock").String()
restURL = kingpin.Flag(
"rest-url",
"SLURM REST API URL, eg http://localhost:6820",
).Default("").String()
timeout = kingpin.Flag("rest-timeout", "Timeout of REST HTTP queries").Default("60").Int()
tokenTimeout = kingpin.Flag("token-timeout", "Timeout of getting REST token").Default("5").Int()
token Token
)
const (
namespace = "slurm"
tokenLifespan = 86400
)
func main() {
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
kingpin.Version(version.Print("slurm-exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promlog.New(promlogConfig)
cfg := slurmrest.NewConfiguration()
cfg.HTTPClient = &http.Client{Timeout: time.Duration(*timeout) * time.Second}
if *restURL != "" {
url, err := url.Parse(*restURL)
if err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
cfg.Scheme = url.Scheme
cfg.Host = url.Host
user, err := user.Current()
if err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
headers := make(map[string]string)
headers["X-SLURM-USER-NAME"] = user.Username
headers["X-SLURM-USER-TOKEN"] = ""
cfg.DefaultHeader = headers
} else {
tr := &http.Transport{
DialContext: func(ctx context.Context, _, addr string) (net.Conn, error) {
dialer := net.Dialer{}
return dialer.DialContext(ctx, "unix", *unixSocket)
},
}
cfg.Scheme = "http"
cfg.Host = "localhost"
cfg.HTTPClient.Transport = tr
}
level.Info(logger).Log("msg", "Starting slurm-exporter", "version", version.Info())
level.Info(logger).Log("msg", "Build context", "build_context", version.BuildContext())
level.Info(logger).Log("msg", "Starting Server", "address", *listenAddress)
http.Handle("/metrics", metricsHandler(cfg, logger))
err := http.ListenAndServe(*listenAddress, nil)
if err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
}
func metricsHandler(cfg *slurmrest.Configuration, logger log.Logger) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if *restURL != "" {
if (token.created + int64(tokenLifespan)) <= time.Now().Unix() {
level.Info(logger).Log("msg", "Getting new JWT")
err := getToken()
if err != nil {
level.Error(logger).Log("msg", "Unable to get JWT", "err", err)
http.Error(w, fmt.Sprintf("Unable to get JWT: %s", err), http.StatusNotFound)
return
}
}
token.RLock()
defer token.RUnlock()
cfg.DefaultHeader["X-SLURM-USER-TOKEN"] = token.token
}
client := slurmrest.NewAPIClient(cfg)
registry := prometheus.NewRegistry()
registry.MustRegister(NewNodesCollector(client, logger))
registry.MustRegister(NewPartitionNodesCollector(client, logger))
registry.MustRegister(NewSchedulerCollector(client, logger))
registry.MustRegister(NewJobsCollector(client, logger))
registry.MustRegister(NewPartitionJobsCollector(client, logger))
registry.MustRegister(NewLicensesCollector(client, logger))
registry.MustRegister(NewPingCollector(client, logger))
gatherers := prometheus.Gatherers{registry, prometheus.DefaultGatherer}
h := promhttp.HandlerFor(gatherers, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}
}
func getToken() error {
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(*tokenTimeout)*time.Second)
defer cancel()
cmd := exec.CommandContext(ctx, "scontrol", "token", fmt.Sprintf("lifespan=%d", tokenLifespan))
var stdout, stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
return err
}
re := regexp.MustCompile(`^SLURM_JWT=(.*)`)
match := re.FindStringSubmatch(strings.TrimSpace(stdout.String()))
if len(match) == 2 {
token.Lock()
defer token.Unlock()
token.token = match[1]
token.created = time.Now().Unix()
} else {
return fmt.Errorf("Unable to match SLURM_JWT from output, output=%s", stdout.String())
}
return nil
}