Fix 0.4.0 compilation problem (#277)

* Fix parsing kingpin flags according to exporter-toolkit v0.8.2

Fixes #275

Signed-off-by: Nikolay Pelov <npelov@gmail.com>

* Update README file to reflect the changed options from exporter-toolkit.

* Update release version to 0.4.1

---------

Signed-off-by: Nikolay Pelov <npelov@gmail.com>

Author: pelov

Makefile

@@ -3,7 +3,7 @@ OS_TYPE        ?= $(shell uname -s | tr '[:upper:]' '[:lower:]')
 ARCH_TYPE      ?= $(subst x86_64,amd64,$(patsubst i%86,386,$(ARCH)))
 GOOS           ?= $(shell go env GOOS)
 GOARCH         ?= $(shell go env GOARCH)
-VERSION        ?= 0.4.0
+VERSION        ?= 0.4.1
 MAJOR_VERSION  ?= 21
 MINOR_VERSION  ?= 8
 ORACLE_VERSION ?= $(MAJOR_VERSION).$(MINOR_VERSION)

README.md

@@ -179,6 +179,8 @@ Usage of oracledb_exporter:
         File that may contain various custom metrics in a TOML file.
   --default.metrics string
         Default TOML file metrics.
+  --web.systemd-socket
+        Use systemd socket activation listeners instead of port listeners (Linux only).
   --web.listen-address string
        	Address to listen on for web interface and telemetry. (default ":9161")
   --web.telemetry-path string
@@ -187,8 +189,8 @@ Usage of oracledb_exporter:
         Number of maximum idle connections in the connection pool. (default "0")
   --database.maxOpenConns string
         Number of maximum open connections in the connection pool. (default "10")
-  --web.config
-        Specify which web configuration file to load
+  --web.config.file
+        Path to configuration file that can enable TLS or authentication.
 ```
 
 # Default metrics
@@ -497,7 +499,7 @@ If you experience an error `Error scraping for wait_time: sql: Scan error on col
 
 export NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1
 export DATA_SOURCE_NAME=system/oracle@myhost
-/path/to/binary --log.level error --web.listen-address 9161
+/path/to/binary --log.level error --web.listen-address :9161
 ```
 
 If using Docker, set the same variable using the -e flag.

main.go

@@ -28,6 +28,7 @@ import (
 	"github.com/prometheus/common/promlog"
 	"github.com/prometheus/common/promlog/flag"
 	"github.com/prometheus/exporter-toolkit/web"
+	webflag "github.com/prometheus/exporter-toolkit/web/kingpinflag"
 	"gopkg.in/alecthomas/kingpin.v2"
 	//Required for debugging
 	//_ "net/http/pprof"
@@ -36,14 +37,12 @@ import (
 var (
 	// Version will be set at build time.
 	Version            = "0.0.0.dev"
-	listenAddress      = kingpin.Flag("web.listen-address", "Address to listen on for web interface and telemetry. (env: LISTEN_ADDRESS)").Default(getEnv("LISTEN_ADDRESS", ":9161")).String()
 	metricPath         = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics. (env: TELEMETRY_PATH)").Default(getEnv("TELEMETRY_PATH", "/metrics")).String()
 	defaultFileMetrics = kingpin.Flag("default.metrics", "File with default metrics in a TOML file. (env: DEFAULT_METRICS)").Default(getEnv("DEFAULT_METRICS", "default-metrics.toml")).String()
 	customMetrics      = kingpin.Flag("custom.metrics", "File that may contain various custom metrics in a TOML file. (env: CUSTOM_METRICS)").Default(getEnv("CUSTOM_METRICS", "")).String()
 	queryTimeout       = kingpin.Flag("query.timeout", "Query timeout (in seconds). (env: QUERY_TIMEOUT)").Default(getEnv("QUERY_TIMEOUT", "5")).String()
 	maxIdleConns       = kingpin.Flag("database.maxIdleConns", "Number of maximum idle connections in the connection pool. (env: DATABASE_MAXIDLECONNS)").Default(getEnv("DATABASE_MAXIDLECONNS", "0")).Int()
 	maxOpenConns       = kingpin.Flag("database.maxOpenConns", "Number of maximum open connections in the connection pool. (env: DATABASE_MAXOPENCONNS)").Default(getEnv("DATABASE_MAXOPENCONNS", "10")).Int()
-	tlsconfigFile      = kingpin.Flag("web.config", "Path to config yaml file that can enable TLS or authentication.").Default("").String()
 	scrapeInterval     = kingpin.Flag("scrape.interval", "Interval between each scrape. Default is to scrape on collect requests").Default("0s").Duration()
 )
 
@@ -587,6 +586,7 @@ func main() {
 
 	promlogConfig := &promlog.Config{}
 	flag.AddFlags(kingpin.CommandLine, promlogConfig)
+	var toolkitFlags = webflag.AddFlags(kingpin.CommandLine, ":9161")
 
 	kingpin.Version("oracledb_exporter " + Version)
 	kingpin.HelpFlag.Short('h')
@@ -615,10 +615,9 @@ func main() {
 		w.Write([]byte("<html><head><title>Oracle DB Exporter " + Version + "</title></head><body><h1>Oracle DB Exporter " + Version + "</h1><p><a href='" + *metricPath + "'>Metrics</a></p></body></html>"))
 	})
 
-	level.Info(logger).Log("Listening on", *listenAddress)
-	server := &http.Server{Addr: *listenAddress}
-	if err := web.ListenAndServe(server, *tlsconfigFile, logger); err != nil {
-		level.Error(logger).Log("err", err)
+	server := &http.Server{}
+	if err := web.ListenAndServe(server, toolkitFlags, logger); err != nil {
+		level.Error(logger).Log("msg", err)
 		os.Exit(1)
 	}
 }