Implement solana exporter

Test Plan:

```
$ curl -s localhost:8080/metrics | grep ^solana | head -n 2
solana_active_validators{state="current"} 55
solana_active_validators{state="delinquent"} 3

$ curl -s localhost:8080/metrics | grep GaPde6VAj6EqheqFNiEALLAZKuKYJ9B8wYDr3WDgNM69
solana_validator_activated_stake{pubkey="GaPde6VAj6EqheqFNiEALLAZKuKYJ9B8wYDr3WDgNM69"} 6.7028325569004e+13
solana_validator_last_vote{pubkey="GaPde6VAj6EqheqFNiEALLAZKuKYJ9B8wYDr3WDgNM69"} 1.124376e+06
solana_validator_root_slot{pubkey="GaPde6VAj6EqheqFNiEALLAZKuKYJ9B8wYDr3WDgNM69"} 1.124339e+06
```

If an error occurs, the scrape fails.

Origin-Revision: http://rev/D360
This commit is contained in:
Leopold Schabel 2020-01-31 14:53:53 +01:00
parent 5b1886afe5
commit 6418a7d90a
3 changed files with 255 additions and 0 deletions

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package main
import (
"bytes"
"encoding/json"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"io/ioutil"
"log"
"net/http"
"os"
"time"
)
type (
VoteAccount struct {
ActivatedStake int64 `json:"activatedStake"`
Commission int `json:"commission"`
EpochCredits [][]int `json:"epochCredits"`
EpochVoteAccount bool `json:"epochVoteAccount"`
LastVote int `json:"lastVote"`
NodePubkey string `json:"nodePubkey"`
RootSlot int `json:"rootSlot"`
VotePubkey string `json:"votePubkey"`
}
GetVoteAccountsResponse struct {
Result struct {
Current []VoteAccount `json:"current"`
Delinquent []VoteAccount `json:"delinquent"`
} `json:"result"`
}
)
const (
httpTimeout = 2 * time.Second
)
var (
listenAddr = os.Getenv("LISTEN_ADDR")
solanaRPCAddr = os.Getenv("SOLANA_RPC_ADDR")
)
func init() {
if solanaRPCAddr == "" {
log.Fatal("Please specify SOLANA_RPC_ADDR")
}
if listenAddr == "" {
listenAddr = ":8080"
}
}
type solanaCollector struct {
client *http.Client
rpcAddr string
totalValidatorsDesc *prometheus.Desc
validatorActivatedStake *prometheus.Desc
validatorLastVote *prometheus.Desc
validatorRootSlot *prometheus.Desc
validatorDelinquent *prometheus.Desc
}
func NewSolanaCollector(rpcAddr string) prometheus.Collector {
return &solanaCollector{
client: &http.Client{Timeout: httpTimeout},
rpcAddr: rpcAddr,
totalValidatorsDesc: prometheus.NewDesc(
"solana_active_validators",
"Total number of active validators by state",
[]string{"state"}, nil),
validatorActivatedStake: prometheus.NewDesc(
"solana_validator_activated_stake",
"Activated stake per validator",
[]string{"pubkey"}, nil),
validatorLastVote: prometheus.NewDesc(
"solana_validator_last_vote",
"Last voted slot per validator",
[]string{"pubkey"}, nil),
validatorRootSlot: prometheus.NewDesc(
"solana_validator_root_slot",
"Root slot per validator",
[]string{"pubkey"}, nil),
validatorDelinquent: prometheus.NewDesc(
"solana_validator_delinquent",
"Whether a validator is delinquent",
[]string{"pubkey"}, nil),
}
}
func (collector solanaCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- collector.totalValidatorsDesc
}
func (collector solanaCollector) mustEmitMetrics(ch chan<- prometheus.Metric, response *GetVoteAccountsResponse) {
ch <- prometheus.MustNewConstMetric(collector.totalValidatorsDesc, prometheus.GaugeValue,
float64(len(response.Result.Delinquent)), "delinquent")
ch <- prometheus.MustNewConstMetric(collector.totalValidatorsDesc, prometheus.GaugeValue,
float64(len(response.Result.Current)), "current")
for _, account := range append(response.Result.Current, response.Result.Delinquent...) {
ch <- prometheus.MustNewConstMetric(collector.validatorActivatedStake, prometheus.GaugeValue,
float64(account.ActivatedStake), account.VotePubkey)
ch <- prometheus.MustNewConstMetric(collector.validatorLastVote, prometheus.GaugeValue,
float64(account.LastVote), account.VotePubkey)
ch <- prometheus.MustNewConstMetric(collector.validatorRootSlot, prometheus.GaugeValue,
float64(account.RootSlot), account.VotePubkey)
}
for _, account := range response.Result.Current {
ch <- prometheus.MustNewConstMetric(collector.validatorDelinquent, prometheus.GaugeValue,
0, account.VotePubkey)
}
for _, account := range response.Result.Delinquent {
ch <- prometheus.MustNewConstMetric(collector.validatorDelinquent, prometheus.GaugeValue,
1, account.VotePubkey)
}
}
func (collector solanaCollector) Collect(ch chan<- prometheus.Metric) {
var (
voteAccounts GetVoteAccountsResponse
body []byte
err error
)
req, err := http.NewRequest("POST", collector.rpcAddr,
bytes.NewBufferString(`{"jsonrpc":"2.0","id":1, "method":"getVoteAccounts"}`))
if err != nil {
panic(err)
}
req.Header.Set("content-type", "application/json")
resp, err := collector.client.Do(req)
if err != nil {
goto error
}
defer resp.Body.Close()
body, err = ioutil.ReadAll(resp.Body)
if err != nil {
goto error
}
if err = json.Unmarshal(body, &voteAccounts); err != nil {
goto error
}
collector.mustEmitMetrics(ch, &voteAccounts)
return
error:
ch <- prometheus.NewInvalidMetric(collector.totalValidatorsDesc, err)
ch <- prometheus.NewInvalidMetric(collector.validatorActivatedStake, err)
ch <- prometheus.NewInvalidMetric(collector.validatorLastVote, err)
ch <- prometheus.NewInvalidMetric(collector.validatorRootSlot, err)
ch <- prometheus.NewInvalidMetric(collector.validatorDelinquent, err)
}
func main() {
collector := NewSolanaCollector(solanaRPCAddr)
prometheus.MustRegister(collector)
http.Handle("/metrics", promhttp.Handler())
panic(http.ListenAndServe(listenAddr, nil))
}

5
go.mod Normal file
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module github.com/certusone/solana_exporter
go 1.13
require github.com/prometheus/client_golang v1.4.0

86
go.sum Normal file
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@ -0,0 +1,86 @@
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github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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