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couchdb-exporter.go
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couchdb-exporter.go
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package main
import (
"fmt"
goflag "flag"
"net/http"
"strconv"
"strings"
"github.com/gesellix/couchdb-prometheus-exporter/glogadapt"
"github.com/gesellix/couchdb-prometheus-exporter/lib"
"github.com/golang/glog"
"github.com/namsral/flag"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
type exporterConfigType struct {
listenAddress string
metricsEndpoint string
couchdbURI string
couchdbUsername string
couchdbPassword string
couchdbInsecure bool
databases string
}
var exporterConfig exporterConfigType
func init() {
flag.String(flag.DefaultConfigFlagname, "", "path to config file")
flag.StringVar(&exporterConfig.listenAddress, "telemetry.address", "localhost:9984", "Address on which to expose metrics.")
flag.StringVar(&exporterConfig.metricsEndpoint, "telemetry.endpoint", "/metrics", "Path under which to expose metrics.")
flag.StringVar(&exporterConfig.couchdbURI, "couchdb.uri", "http://localhost:5984", "URI to the CouchDB instance")
flag.StringVar(&exporterConfig.couchdbUsername, "couchdb.username", "", "Basic auth username for the CouchDB instance")
flag.StringVar(&exporterConfig.couchdbPassword, "couchdb.password", "", "Basic auth password for the CouchDB instance")
flag.BoolVar(&exporterConfig.couchdbInsecure, "couchdb.insecure", true, "Ignore server certificate if using https")
flag.StringVar(&exporterConfig.databases, "databases", "", "Comma separated list of database names")
flag.BoolVar(&glogadapt.Logging.ToStderr, "logtostderr", false, "log to standard error instead of files")
flag.BoolVar(&glogadapt.Logging.AlsoToStderr, "alsologtostderr", false, "log to standard error as well as files")
flag.Var(&glogadapt.Logging.Verbosity, "v", "log level for V logs")
flag.Var(&glogadapt.Logging.StderrThreshold, "stderrthreshold", "logs at or above this threshold go to stderr")
flag.StringVar(&glogadapt.Logging.LogDir, "log_dir", "", "If non-empty, write log files in this directory")
}
func main() {
flag.Parse()
// Convinces goflags that we have called Parse() to avoid noisy logs.
// Necessary due to https://github.com/golang/glog/commit/65d674618f712aa808a7d0104131b9206fc3d5ad
// and us using another flags package.
goflag.CommandLine.Parse([]string{})
goflag.Lookup("logtostderr").Value.Set(strconv.FormatBool(*&glogadapt.Logging.ToStderr))
goflag.Lookup("alsologtostderr").Value.Set(strconv.FormatBool(*&glogadapt.Logging.AlsoToStderr))
goflag.Lookup("v").Value.Set(glogadapt.Logging.Verbosity.String())
goflag.Lookup("stderrthreshold").Value.Set(glogadapt.Logging.StderrThreshold.String())
goflag.Lookup("log_dir").Value.Set(glogadapt.Logging.LogDir)
databases := strings.Split(*&exporterConfig.databases, ",")
exporter := lib.NewExporter(
*&exporterConfig.couchdbURI,
lib.BasicAuth{
Username: *&exporterConfig.couchdbUsername,
Password: *&exporterConfig.couchdbPassword},
databases,
*&exporterConfig.couchdbInsecure)
prometheus.MustRegister(exporter)
http.Handle(*&exporterConfig.metricsEndpoint, promhttp.Handler())
http.HandleFunc("/status", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, "OK")
})
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, *&exporterConfig.metricsEndpoint, http.StatusMovedPermanently)
})
glog.Infof("Starting exporter at '%s' to read from CouchDB at '%s'", *&exporterConfig.listenAddress, *&exporterConfig.couchdbURI)
err := http.ListenAndServe(*&exporterConfig.listenAddress, nil)
if err != nil {
glog.Fatal(err)
}
}