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main.go
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main.go
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package main
import (
"bufio"
"encoding/json"
"flag"
"net"
"net/http"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/common/version"
)
const (
namespace = "twemproxy_exporter"
)
func main() {
var (
timeout = flag.Duration("twemproxy.timeout", 2*time.Second, "Timeout for request to twemproxy.")
twemproxyAddress = flag.String("twemproxy.stats-address", "localhost:22222", "Stats address of twemproxy.")
metricsPath = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
listenAddress = flag.String("web.listen-address", ":9151", "Address to listen on for web interface and telemetry.")
)
flag.Parse()
if *twemproxyAddress == "" {
log.Fatalln("-twemproxy.stats-address must not be blank")
}
if *timeout == 0 {
*timeout = 2 * time.Second
}
prometheus.MustRegister(newExporter(*twemproxyAddress, *timeout))
http.Handle(*metricsPath, prometheus.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Twemproxy Exporter</title></head>
<body>
<h1>Twemproxy Exporter</h1>
<p><a href="` + *metricsPath + `">Metrics</a></p>
</body>
</html>`))
})
log.Infoln("starting twemproxy_exporter", version.Info())
log.Infoln("build context", version.BuildContext())
log.Infoln("listening on", *listenAddress)
log.Fatal(http.ListenAndServe(*listenAddress, nil))
}
type exporter struct {
endpoint string
timeout time.Duration
up *prometheus.Desc
totalConnections *prometheus.Desc
currentConnections *prometheus.Desc // How is this different from activeClientConnections?
// Client metrics
clientEOF *prometheus.Desc
clientErr *prometheus.Desc
activeClientConnections *prometheus.Desc // Double check this is a gauge, it sounds like one..
// Number of times a backend server was ejected
backendServerEjections *prometheus.Desc
forwardErrors *prometheus.Desc
// Fragments created from a multi-vector request
fragments *prometheus.Desc
// Server metrics
serverEOF *prometheus.Desc
serverErr *prometheus.Desc
serverTimeouts *prometheus.Desc
activeServerConnections *prometheus.Desc
serverEjectedAt *prometheus.Desc // Not mentioned in README, maybe unix timestamp of when server was ejected?
requestCount *prometheus.Desc
requestBytes *prometheus.Desc
responseCount *prometheus.Desc
responseBytes *prometheus.Desc
incomingQueueGauge *prometheus.Desc // Double check this is a gauge, it sounds like one..
incomingQueueBytesGauge *prometheus.Desc // Double check this is a gauge, it sounds like one..
outgoingQueueGauge *prometheus.Desc // Double check this is a gauge, it sounds like one..
outgoingQueueBytesGauge *prometheus.Desc // Double check this is a gauge, it sounds like one..
}
func newExporter(endpoint string, timeout time.Duration) *exporter {
return &exporter{
endpoint: endpoint,
timeout: timeout,
up: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "up"),
"Could twemproxy be queried.",
nil,
nil,
),
totalConnections: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "connections_total"),
"Total number of connections.",
nil,
nil,
),
currentConnections: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "current_connections"),
"The current number of connections.",
nil,
nil,
),
clientEOF: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "client_eof_total"),
"Total number of client EOFs.",
[]string{"pool"},
nil,
),
clientErr: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "client_err_total"),
"Total number of client errors.",
[]string{"pool"},
nil,
),
activeClientConnections: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "client_connections_active"),
"The current number of active client connections.",
[]string{"pool"},
nil,
),
backendServerEjections: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "backend_server_ejections_total"),
"The number of times a backend has been ejected.",
[]string{"pool"},
nil,
),
forwardErrors: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "forward_errors_total"),
"Total number of forward errors.",
[]string{"pool"},
nil,
),
fragments: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "fragments_total"),
"Total number fragments created from multi-vector requests.",
[]string{"pool"},
nil,
),
serverEOF: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_eof_total"),
"Total number of server EOFs.",
[]string{"pool", "server"},
nil,
),
serverErr: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_err_total"),
"Total number of server errors.",
[]string{"pool", "server"},
nil,
),
serverTimeouts: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_timeouts_total"),
"Total number of times the server has timed out.",
[]string{"pool", "server"},
nil,
),
activeServerConnections: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_connections_active"),
"The current number of active server connections.",
[]string{"pool", "server"},
nil,
),
serverEjectedAt: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_ejected_at"),
"The time when the server was ejected in UNIX time.", // Confirm ms/sec?
[]string{"pool", "server"},
nil,
),
requestCount: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_requests_total"),
"Total number of requests to the server.",
[]string{"pool", "server"},
nil,
),
requestBytes: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_requests_bytes_total"),
"Total number of requests bytes sent to the server.",
[]string{"pool", "server"},
nil,
),
responseCount: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_responses_total"),
"Total number of responses to the server.",
[]string{"pool", "server"},
nil,
),
responseBytes: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "server_responses_bytes_total"),
"Total number of response bytes sent to the server.",
[]string{"pool", "server"},
nil,
),
incomingQueueGauge: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "incoming_queue"),
"The current number of requests in the incoming queue.",
[]string{"pool", "server"},
nil,
),
incomingQueueBytesGauge: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "incoming_queue_bytes"),
"The current number of bytes in the incoming queue.",
[]string{"pool", "server"},
nil,
),
outgoingQueueGauge: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "outgoing_queue"),
"The current number of requests in the outgoing queue.",
[]string{"pool", "server"},
nil,
),
outgoingQueueBytesGauge: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "outgoing_queue_bytes"),
"The current number of bytes in the outgoing queue.",
[]string{"pool", "server"},
nil,
),
}
}
// Collect implements prometheus.Collector. It fetches the statistics from
// twemproxy, and delivers them as Prometheus metrics.
func (e *exporter) Collect(ch chan<- prometheus.Metric) {
var up float64
defer func() {
ch <- prometheus.MustNewConstMetric(e.up, prometheus.GaugeValue, up)
}()
st, err := e.collect()
if err != nil {
log.Infof("failed to collect stats: %v", err)
return
}
up = 1
ch <- prometheus.MustNewConstMetric(e.totalConnections, prometheus.CounterValue, st.TotalConnections)
ch <- prometheus.MustNewConstMetric(e.currentConnections, prometheus.GaugeValue, st.CurrConnections)
for poolName, pool := range st.Pools {
ch <- prometheus.MustNewConstMetric(e.clientEOF, prometheus.CounterValue, pool.ClientEOF, poolName)
ch <- prometheus.MustNewConstMetric(e.clientErr, prometheus.CounterValue, pool.ClientErr, poolName)
ch <- prometheus.MustNewConstMetric(e.activeClientConnections, prometheus.GaugeValue, pool.ClientConnections, poolName)
ch <- prometheus.MustNewConstMetric(e.backendServerEjections, prometheus.CounterValue, pool.ServerEjects, poolName)
ch <- prometheus.MustNewConstMetric(e.forwardErrors, prometheus.CounterValue, pool.ForwardError, poolName)
ch <- prometheus.MustNewConstMetric(e.fragments, prometheus.CounterValue, pool.Fragments, poolName)
for serverName, server := range pool.Servers {
ch <- prometheus.MustNewConstMetric(e.serverEOF, prometheus.CounterValue, server.ServerEOF, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.serverErr, prometheus.CounterValue, server.ServerErr, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.serverTimeouts, prometheus.CounterValue, server.ServerTimedout, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.activeServerConnections, prometheus.GaugeValue, server.ServerConnections, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.serverEjectedAt, prometheus.GaugeValue, server.ServerEjectedAt, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.requestCount, prometheus.CounterValue, server.Requests, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.requestBytes, prometheus.CounterValue, server.RequestBytes, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.responseCount, prometheus.CounterValue, server.Responses, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.responseBytes, prometheus.CounterValue, server.ResponseBytes, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.incomingQueueGauge, prometheus.GaugeValue, server.InQueue, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.incomingQueueBytesGauge, prometheus.GaugeValue, server.InQueueBytes, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.outgoingQueueGauge, prometheus.GaugeValue, server.OutQueue, poolName, serverName)
ch <- prometheus.MustNewConstMetric(e.outgoingQueueBytesGauge, prometheus.GaugeValue, server.OutQueueBytes, poolName, serverName)
}
}
}
func (e *exporter) collect() (*stats, error) {
// TODO: Reuse connection, connect with net.DialTCP?
conn, err := net.DialTimeout("tcp", e.endpoint, e.timeout)
if err != nil {
log.Errorf("failed to dial endpoint: %v", err)
return nil, err
}
conn.SetReadDeadline(time.Now().Add(e.timeout))
defer conn.Close()
r := bufio.NewReader(conn)
st := new(stats)
if err := json.NewDecoder(r).Decode(st); err != nil {
log.Errorf("failed to unmarshal response: %v", err)
return nil, err
}
return st, nil
}
// Describe implements prometheus.Collector. It sends all Descriptors possible
// from this exporter.
func (e *exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- e.up
ch <- e.totalConnections
ch <- e.currentConnections
ch <- e.clientEOF
ch <- e.clientErr
ch <- e.activeClientConnections
ch <- e.backendServerEjections
ch <- e.forwardErrors
ch <- e.fragments
ch <- e.serverEOF
ch <- e.serverErr
ch <- e.serverTimeouts
ch <- e.activeServerConnections
ch <- e.serverEjectedAt
ch <- e.requestCount
ch <- e.requestBytes
ch <- e.responseCount
ch <- e.responseBytes
ch <- e.incomingQueueGauge
ch <- e.incomingQueueBytesGauge
ch <- e.outgoingQueueGauge
ch <- e.outgoingQueueBytesGauge
}