lib/flagutil: add NewArray helper func

app/vminsert/main.go

@@ -26,21 +26,20 @@ var (
 	opentsdbListenAddr   = flag.String("opentsdbListenAddr", "", "TCP and UDP address to listen for OpentTSDB put messages. Usually :4242 must be set. Doesn't work if empty")
 	httpListenAddr       = flag.String("httpListenAddr", ":8480", "Address to listen for http connections")
 	maxInsertRequestSize = flag.Int("maxInsertRequestSize", 32*1024*1024, "The maximum size of a single insert request in bytes")
-	storageNodes         flagutil.Array
+	storageNodes         = flagutil.NewArray("storageNode", "Address of vmstorage nodes; usage: -storageNode=vmstorage-host1:8400 -storageNode=vmstorage-host2:8400")
 )
 
 func main() {
-	flag.Var(&storageNodes, "storageNode", "Vmstorage address, usage -storageNode=vmstorage-host1:8400 -storageNode=vmstorage-host2:8400")
 	flag.Parse()
 	buildinfo.Init()
 	logger.Init()
 
-	logger.Infof("initializing netstorage for storageNodes=%v...", storageNodes)
+	logger.Infof("initializing netstorage for storageNodes=%s...", *storageNodes)
 	startTime := time.Now()
-	if len(storageNodes) == 0 {
+	if len(*storageNodes) == 0 {
 		logger.Fatalf("storageNodes cannot be empty")
 	}
-	netstorage.InitStorageNodes(storageNodes)
+	netstorage.InitStorageNodes(*storageNodes)
 	logger.Infof("successfully initialized netstorage in %s", time.Since(startTime))
 
 	concurrencylimiter.Init()

app/vmselect/main.go

@@ -26,22 +26,20 @@ var (
 	cacheDataPath         = flag.String("cacheDataPath", "", "Path to directory for cache files. Cache isn't saved if empty")
 	maxConcurrentRequests = flag.Int("search.maxConcurrentRequests", runtime.GOMAXPROCS(-1)*2, "The maximum number of concurrent search requests. It shouldn't exceed 2*vCPUs for better performance. See also -search.maxQueueDuration")
 	maxQueueDuration      = flag.Duration("search.maxQueueDuration", 10*time.Second, "The maximum time the request waits for execution when -search.maxConcurrentRequests limit is reached")
-
-	storageNodes flagutil.Array
+	storageNodes          = flagutil.NewArray("storageNode", "Addresses of vmstorage nodes; usage: -storageNode=vmstorage-host1:8401 -storageNode=vmstorage-host2:8401")
 )
 
 func main() {
-	flag.Var(&storageNodes, "storageNode", "Vmstorage address, usage -storageNode=vmstorage-host1:8401 -storageNode=vmstorage-host2:8401")
 	flag.Parse()
 	buildinfo.Init()
 	logger.Init()
 
-	logger.Infof("starting netstorage at storageNodes=%v", storageNodes)
+	logger.Infof("starting netstorage at storageNodes=%s", *storageNodes)
 	startTime := time.Now()
-	if len(storageNodes) == 0 {
+	if len(*storageNodes) == 0 {
 		logger.Fatalf("storageNodes cannot be empty")
 	}
-	netstorage.InitStorageNodes(storageNodes)
+	netstorage.InitStorageNodes(*storageNodes)
 	logger.Infof("started netstorage in %s", time.Since(startTime))
 
 	if len(*cacheDataPath) > 0 {

app/vmselect/prometheus/prometheus.go

@@ -23,14 +23,9 @@ import (
 var (
 	maxQueryDuration = flag.Duration("search.maxQueryDuration", time.Second*30, "The maximum time for search query execution")
 	maxQueryLen      = flag.Int("search.maxQueryLen", 16*1024, "The maximum search query length in bytes")
-
-	selectNodes flagutil.Array
+	selectNodes      = flagutil.NewArray("selectNode", "Addresses of vmselect nodes; usage: -selectNode=vmselect-host1:8481 -selectNode=vmselect-host2:8481")
 )
 
-func init() {
-	flag.Var(&selectNodes, "selectNode", "vmselect address, usage -selectNode=vmselect-host1:8481 -selectNode=vmselect-host2:8481")
-}
-
 // Default step used if not set.
 const defaultStep = 5 * 60 * 1000
 
@@ -239,10 +234,10 @@ func DeleteHandler(at *auth.Token, r *http.Request) error {
 var deleteDuration = metrics.NewSummary(`vm_request_duration_seconds{path="/api/v1/admin/tsdb/delete_series"}`)
 
 func resetRollupResultCaches() {
-	if len(selectNodes) == 0 {
+	if len(*selectNodes) == 0 {
 		logger.Panicf("BUG: missing -selectNode flag")
 	}
-	for _, selectNode := range selectNodes {
+	for _, selectNode := range *selectNodes {
 		callURL := fmt.Sprintf("http://%s/internal/resetRollupResultCache", selectNode)
 		resp, err := httpClient.Get(callURL)
 		if err != nil {

lib/flagutil/array.go

@@ -1,6 +1,16 @@
 package flagutil
 
-import "strings"
+import (
+	"flag"
+	"strings"
+)
+
+// NewArray returns new Array with the given name and descprition.
+func NewArray(name, description string) *Array {
+	var a Array
+	flag.Var(&a, name, description)
+	return &a
+}
 
 // Array holds an array of flag values
 type Array []string