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package config
import (
"errors"
"flag"
"fmt"
"log"
"os"
"strconv"
"strings"
)
const (
defaultListenAddress = ":9301"
defaultWebConfigPath = ""
defaultListenPort = 9301
defaultMetricsPath = "/metrics"
defaultSquidHostname = "localhost"
defaultSquidPort = 3128
defaultExtractServiceTimes = true
defaultUseProxyHeader = false
)
const (
squidExporterListenKey = "SQUID_EXPORTER_LISTEN"
squidExporterWebConfigPathKey = "SQUID_EXPORTER_WEB_CONFIG_PATH"
squidExporterMetricsPathKey = "SQUID_EXPORTER_METRICS_PATH"
squidHostnameKey = "SQUID_HOSTNAME"
squidPortKey = "SQUID_PORT"
squidLoginKey = "SQUID_LOGIN"
squidPasswordKey = "SQUID_PASSWORD"
squidPidfile = "SQUID_PIDFILE"
squidExtractServiceTimes = "SQUID_EXTRACTSERVICETIMES"
squidUseProxyHeader = "SQUID_USE_PROXY_HEADER"
)
var (
VersionFlag *bool
)
type Labels struct {
Keys []string
Values []string
}
// Config configurations for exporter.
type Config struct {
ListenAddress string
WebConfigPath string
MetricPath string
Labels Labels
ExtractServiceTimes bool
SquidHostname string
SquidPort int
Login string
Password string
Pidfile string
UseProxyHeader bool
}
// NewConfig creates a new config object from command line args.
func NewConfig() *Config {
c := &Config{}
flag.StringVar(&c.ListenAddress, "listen",
loadEnvStringVar(squidExporterListenKey, defaultListenAddress), "Address and Port to bind exporter, in host:port format")
flag.StringVar(&c.WebConfigPath, "web.config.file", loadEnvStringVar(squidExporterWebConfigPathKey, defaultWebConfigPath),
"Path to configuration file that can enable TLS or authentication. See: https://github.com/prometheus/exporter-toolkit/blob/master/docs/web-configuration.md")
flag.StringVar(&c.MetricPath, "metrics-path",
loadEnvStringVar(squidExporterMetricsPathKey, defaultMetricsPath), "Metrics path to expose prometheus metrics")
flag.BoolVar(&c.ExtractServiceTimes, "extractservicetimes",
loadEnvBoolVar(squidExtractServiceTimes, defaultExtractServiceTimes), "Extract service times metrics")
flag.Var(&c.Labels, "label", "Custom metrics to attach to metrics, use -label multiple times for each additional label")
flag.StringVar(&c.SquidHostname, "squid-hostname",
loadEnvStringVar(squidHostnameKey, defaultSquidHostname), "Squid hostname")
flag.IntVar(&c.SquidPort, "squid-port",
loadEnvIntVar(squidPortKey, defaultSquidPort), "Squid port to read metrics")
flag.StringVar(&c.Login, "squid-login", loadEnvStringVar(squidLoginKey, ""), "Login to squid service")
flag.StringVar(&c.Password, "squid-password", loadEnvStringVar(squidPasswordKey, ""), "Password to squid service")
flag.StringVar(&c.Pidfile, "squid-pidfile", loadEnvStringVar(squidPidfile, ""), "Optional path to the squid PID file for additional metrics")
flag.BoolVar(&c.UseProxyHeader, "squid-use-proxy-header",
loadEnvBoolVar(squidUseProxyHeader, defaultUseProxyHeader), "Use proxy headers when fetching metrics")
VersionFlag = flag.Bool("version", false, "Print the version and exit")
flag.Parse()
return c
}
func loadEnvBoolVar(key string, def bool) bool {
val := os.Getenv(key)
if val == "" {
return def
}
switch strings.ToLower(val) {
case "true":
return true
case "false":
return false
default:
return def
}
}
func loadEnvStringVar(key, def string) string {
val := os.Getenv(key)
if val == "" {
return def
}
return val
}
func loadEnvIntVar(key string, def int) int {
valStr := os.Getenv(key)
if valStr != "" {
val, err := strconv.ParseInt(valStr, 0, 32)
if err == nil {
return int(val)
}
log.Printf("Error parsing %s='%s'. Integer value expected", key, valStr)
}
return def
}
func (l *Labels) String() string {
var lbls []string
for i := range l.Keys {
lbls = append(lbls, l.Keys[i]+"="+l.Values[i])
}
return strings.Join(lbls, ", ")
}
func (l *Labels) Set(value string) error {
args := strings.Split(value, "=")
if len(args) != 2 || len(args[1]) < 1 {
return errors.New("label must be in 'key=value' format")
}
for _, key := range l.Keys {
if key == args[0] {
return fmt.Errorf("labels must be distinct; found duplicate key %q", args[0])
}
}
l.Keys = append(l.Keys, args[0])
l.Values = append(l.Values, args[1])
return nil
}
|
