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main.go
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main.go
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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// A simple example exposing fictional RPC latencies with different types of
// random distributions (uniform, normal, and exponential) as Prometheus
// metrics.
package main
import (
"flag"
"fmt"
"net/http"
"os"
"strings"
"time"
"github.com/justinas/alice"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/zerolog"
"github.com/rs/zerolog/hlog"
"github.com/simonswine/tplink-switch-exporter/switches"
)
var log = zerolog.New(zerolog.ConsoleWriter{Out: os.Stderr, TimeFormat: time.RFC3339}).With().
Timestamp().
Logger()
func run() error {
var (
addr string
username string
password string
hostname string
)
flag.StringVar(&addr, "listen-address", ":9108", "The address to listen on for HTTP requests.")
flag.StringVar(&username, "switch-username", "admin", "Username used to login to the switch.")
flag.StringVar(&password, "switch-password", "", "Password used to login to the switch.")
flag.StringVar(&hostname, "switch-hostname", "", "TODO")
flag.Parse()
if password == "" {
password = strings.TrimSpace(os.Getenv("SWITCH_PASSWORD"))
if password == "" {
return fmt.Errorf("no switch-password set")
}
}
if hostname == "" {
return fmt.Errorf("no switch-hostname set")
}
// create switch collector
s := switches.NewTPLinkSwitch(
log,
hostname,
username,
password,
).Collector()
reg := prometheus.NewRegistry()
if err := reg.Register(s); err != nil {
return err
}
// go module build info.
if err := reg.Register(collectors.NewBuildInfoCollector()); err != nil {
return err
}
if err := reg.Register(collectors.NewGoCollector()); err != nil {
return err
}
// Install the logger handler with default output on the console
c := alice.New()
c = c.Append(hlog.NewHandler(log))
// Expose the registered metrics via HTTP.
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.HandlerFor(
reg,
promhttp.HandlerOpts{
// Opt into OpenMetrics to support exemplars.
EnableOpenMetrics: true,
},
))
c = c.Append(hlog.AccessHandler(func(r *http.Request, status, size int, duration time.Duration) {
hlog.FromRequest(r).Info().
Str("method", r.Method).
Stringer("url", r.URL).
Int("status", status).
Int("size", size).
Dur("duration", duration).
Msg("")
}))
return http.ListenAndServe(addr, c.Then(mux))
}
func main() {
if err := run(); err != nil {
log.Fatal().Err(err).Msg("failed")
}
}