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package main
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"os"
"sync"
"time"
"github.com/ethereum-optimism/optimism/go/op_exporter/k8sClient"
"github.com/ethereum-optimism/optimism/go/op_exporter/version"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
"github.com/ybbus/jsonrpc"
"gopkg.in/alecthomas/kingpin.v2"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
var (
listenAddress = kingpin.Flag(
"web.listen-address",
"Address on which to expose metrics and web interface.",
).Default(":9100").String()
rpcProvider = kingpin.Flag(
"rpc.provider",
"Address for RPC provider.",
).Default("http://127.0.0.1:8545").String()
networkLabel = kingpin.Flag(
"label.network",
"Label to apply to the metrics to identify the network.",
).Default("mainnet").String()
versionFlag = kingpin.Flag(
"version",
"Display binary version.",
).Default("False").Bool()
unhealthyTimePeriod = kingpin.Flag(
"wait.minutes",
"Number of minutes to wait for the next block before marking provider unhealthy.",
).Default("10").Int()
enableK8sQuery = kingpin.Flag(
"k8s.enable",
"Enable kubernetes info lookup.",
).Default("true").Bool()
)
type healthCheck struct {
mu *sync.RWMutex
height uint64
healthy bool
updateTime time.Time
allowedMethods []string
version *string
}
func healthHandler(health *healthCheck) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
health.mu.RLock()
defer health.mu.RUnlock()
w.Write([]byte(fmt.Sprintf(`{ "healthy": "%t", "version": "%s" }`, health.healthy, *health.version)))
}
}
func main() {
kingpin.HelpFlag.Short('h')
kingpin.Parse()
if *versionFlag {
fmt.Printf("(version=%s, gitcommit=%s)\n", version.Version, version.GitCommit)
fmt.Printf("(go=%s, user=%s, date=%s)\n", version.GoVersion, version.BuildUser, version.BuildDate)
os.Exit(0)
}
log.Infoln("exporter config", *listenAddress, *rpcProvider, *networkLabel)
log.Infoln("Starting op_exporter", version.Info())
log.Infoln("Build context", version.BuildContext())
health := healthCheck{
mu: new(sync.RWMutex),
height: 0,
healthy: false,
updateTime: time.Now(),
allowedMethods: nil,
version: nil,
}
http.Handle("/metrics", promhttp.Handler())
http.Handle("/health", healthHandler(&health))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>OP Exporter</title></head>
<body>
<h1>OP Exporter</h1>
<p><a href="/metrics">Metrics</a></p>
<p><a href="/health">Health</a></p>
</body>
</html>`))
})
go getRollupGasPrices()
go getBlockNumber(&health)
if *enableK8sQuery {
client, err := k8sClient.Newk8sClient()
if err != nil {
log.Fatal(err)
}
go getSequencerVersion(&health, client)
}
log.Infoln("Listening on", *listenAddress)
if err := http.ListenAndServe(*listenAddress, nil); err != nil {
log.Fatal(err)
}
}
func getSequencerVersion(health *healthCheck, client *kubernetes.Clientset) {
ns, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
if err != nil {
log.Fatalf("Unable to read namespace file: %s", err)
}
ticker := time.NewTicker(30 * time.Second)
for {
<-ticker.C
getOpts := metav1.GetOptions{
TypeMeta: metav1.TypeMeta{},
ResourceVersion: "",
}
sequencerStatefulSet, err := client.AppsV1().StatefulSets(string(ns)).Get(context.TODO(), "sequencer", getOpts)
if err != nil {
unknownStatus := "UNKNOWN"
health.version = &unknownStatus
log.Errorf("Unable to retrieve a sequencer StatefulSet: %s", err)
continue
}
for _, c := range sequencerStatefulSet.Spec.Template.Spec.Containers {
log.Infof("Checking container %s", c.Name)
switch {
case c.Name == "sequencer":
log.Infof("The sequencer version is: %s", c.Image)
health.version = &c.Image
default:
log.Infof("Unable to find the sequencer container in the statefulset?!?")
}
}
}
}
func getBlockNumber(health *healthCheck) {
rpcClient := jsonrpc.NewClientWithOpts(*rpcProvider, &jsonrpc.RPCClientOpts{})
var blockNumberResponse *string
for {
if err := rpcClient.CallFor(&blockNumberResponse, "eth_blockNumber"); err != nil {
health.mu.Lock()
health.healthy = false
health.mu.Unlock()
log.Warnln("Error calling eth_blockNumber, setting unhealthy", err)
} else {
log.Infoln("Got block number: ", *blockNumberResponse)
health.mu.Lock()
currentHeight, err := hexutil.DecodeUint64(*blockNumberResponse)
blockNumber.WithLabelValues(
*networkLabel, "layer2").Set(float64(currentHeight))
if err != nil {
log.Warnln("Error decoding block height", err)
continue
}
lastHeight := health.height
// If the currentHeight is the same as the lastHeight, check that
// the unhealthyTimePeriod has passed and update health.healthy
if currentHeight == lastHeight {
currentTime := time.Now()
lastTime := health.updateTime
log.Warnln(fmt.Sprintf("Heights are the same, %v, %v", currentTime, lastTime))
if lastTime.Add(time.Duration(*unhealthyTimePeriod) * time.Minute).Before(currentTime) {
health.healthy = false
log.Warnln("Heights are the same for the unhealthyTimePeriod, setting unhealthy")
}
} else {
log.Warnln("New block height detected, setting healthy")
health.height = currentHeight
health.updateTime = time.Now()
health.healthy = true
}
if health.healthy {
healthySequencer.WithLabelValues(
*networkLabel).Set(1)
} else {
healthySequencer.WithLabelValues(
*networkLabel).Set(0)
}
health.mu.Unlock()
}
time.Sleep(time.Duration(30) * time.Second)
}
}
func getRollupGasPrices() {
rpcClient := jsonrpc.NewClientWithOpts(*rpcProvider, &jsonrpc.RPCClientOpts{})
var rollupGasPrices *GetRollupGasPrices
for {
if err := rpcClient.CallFor(&rollupGasPrices, "rollup_gasPrices"); err != nil {
log.Warnln("Error calling rollup_gasPrices", err)
} else {
l1GasPriceString := rollupGasPrices.L1GasPrice
l1GasPrice, err := hexutil.DecodeUint64(l1GasPriceString)
if err != nil {
log.Warnln("Error converting gasPrice " + l1GasPriceString)
}
gasPrice.WithLabelValues(
*networkLabel, "layer1").Set(float64(l1GasPrice))
l2GasPriceString := rollupGasPrices.L2GasPrice
l2GasPrice, err := hexutil.DecodeUint64(l2GasPriceString)
if err != nil {
log.Warnln("Error converting gasPrice " + l2GasPriceString)
}
gasPrice.WithLabelValues(
*networkLabel, "layer2").Set(float64(l2GasPrice))
log.Infoln("Got L1 gas string: ", l1GasPriceString)
log.Infoln("Got L1 gas prices: ", l1GasPrice)
log.Infoln("Got L2 gas string: ", l2GasPriceString)
log.Infoln("Got L2 gas prices: ", l2GasPrice)
}
time.Sleep(time.Duration(30) * time.Second)
}
}