VictoriaMetrics/app/vminsert/main.go
2024-04-02 18:03:12 +03:00

481 lines
21 KiB
Go

package main
import (
"flag"
"fmt"
"io"
"net"
"net/http"
"os"
"strings"
"time"
"github.com/VictoriaMetrics/metrics"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/clusternative"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/csvimport"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/datadogsketches"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/datadogv1"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/datadogv2"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/graphite"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/influx"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/native"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/netstorage"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/newrelic"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/opentelemetry"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/opentsdb"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/opentsdbhttp"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/prometheusimport"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/promremotewrite"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/relabel"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/vmimport"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/auth"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/envflag"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/influxutils"
clusternativeserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/clusternative"
graphiteserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/graphite"
influxserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/influx"
opentsdbserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/opentsdb"
opentsdbhttpserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/opentsdbhttp"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/pushmetrics"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
)
var (
clusternativeListenAddr = flag.String("clusternativeListenAddr", "", "TCP address to listen for data from other vminsert nodes in multi-level cluster setup. "+
"See https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multi-level-cluster-setup . Usually :8400 should be set to match default vmstorage port for vminsert. Disabled work if empty")
graphiteListenAddr = flag.String("graphiteListenAddr", "", "TCP and UDP address to listen for Graphite plaintext data. Usually :2003 must be set. Doesn't work if empty. "+
"See also -graphiteListenAddr.useProxyProtocol")
graphiteUseProxyProtocol = flag.Bool("graphiteListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted at -graphiteListenAddr . "+
"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt")
influxListenAddr = flag.String("influxListenAddr", "", "TCP and UDP address to listen for InfluxDB line protocol data. Usually :8089 must be set. Doesn't work if empty. "+
"This flag isn't needed when ingesting data over HTTP - just send it to http://<victoriametrics>:8428/write . "+
"See also -influxListenAddr.useProxyProtocol")
influxUseProxyProtocol = flag.Bool("influxListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted at -influxListenAddr . "+
"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt")
opentsdbListenAddr = flag.String("opentsdbListenAddr", "", "TCP and UDP address to listen for OpenTSDB metrics. "+
"Telnet put messages and HTTP /api/put messages are simultaneously served on TCP port. "+
"Usually :4242 must be set. Doesn't work if empty. "+
"See also -opentsdbListenAddr.useProxyProtocol")
opentsdbUseProxyProtocol = flag.Bool("opentsdbListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted at -opentsdbListenAddr . "+
"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt")
opentsdbHTTPListenAddr = flag.String("opentsdbHTTPListenAddr", "", "TCP address to listen for OpenTSDB HTTP put requests. Usually :4242 must be set. Doesn't work if empty. "+
"See also -opentsdbHTTPListenAddr.useProxyProtocol")
opentsdbHTTPUseProxyProtocol = flag.Bool("opentsdbHTTPListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted "+
"at -opentsdbHTTPListenAddr . See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt")
httpListenAddrs = flagutil.NewArrayString("httpListenAddr", "Address to listen for incoming http requests. See also -httpListenAddr.useProxyProtocol")
useProxyProtocol = flagutil.NewArrayBool("httpListenAddr.useProxyProtocol", "Whether to use proxy protocol for connections accepted at the given -httpListenAddr . "+
"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt . "+
"With enabled proxy protocol http server cannot serve regular /metrics endpoint. Use -pushmetrics.url for metrics pushing")
maxLabelsPerTimeseries = flag.Int("maxLabelsPerTimeseries", 30, "The maximum number of labels accepted per time series. Superfluous labels are dropped. In this case the vm_metrics_with_dropped_labels_total metric at /metrics page is incremented")
maxLabelValueLen = flag.Int("maxLabelValueLen", 16*1024, "The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented")
storageNodes = flagutil.NewArrayString("storageNode", "Comma-separated addresses of vmstorage nodes; usage: -storageNode=vmstorage-host1,...,vmstorage-hostN . "+
"Enterprise version of VictoriaMetrics supports automatic discovery of vmstorage addresses via dns+srv records. For example, -storageNode=dns+srv:vmstorage.addrs . "+
"See https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#automatic-vmstorage-discovery")
)
var (
clusternativeServer *clusternativeserver.Server
graphiteServer *graphiteserver.Server
influxServer *influxserver.Server
opentsdbServer *opentsdbserver.Server
opentsdbhttpServer *opentsdbhttpserver.Server
)
func main() {
// Write flags and help message to stdout, since it is easier to grep or pipe.
flag.CommandLine.SetOutput(os.Stdout)
flag.Usage = usage
envflag.Parse()
buildinfo.Init()
logger.Init()
logger.Infof("initializing netstorage for storageNodes %s...", *storageNodes)
startTime := time.Now()
if len(*storageNodes) == 0 {
logger.Fatalf("missing -storageNode arg")
}
if hasEmptyValues(*storageNodes) {
logger.Fatalf("found empty address of storage node in the -storageNodes flag, please make sure that all -storageNode args are non-empty")
}
if duplicatedAddr := checkDuplicates(*storageNodes); duplicatedAddr != "" {
logger.Fatalf("found equal addresses of storage nodes in the -storageNodes flag: %q", duplicatedAddr)
}
hashSeed := uint64(0)
if *clusternativeListenAddr != "" {
// Use different hash seed for the second level of vminsert nodes in multi-level cluster setup.
// This should fix uneven distribution of time series among storage nodes.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1672
hashSeed = 0xabcdef0123456789
}
netstorage.Init(*storageNodes, hashSeed)
logger.Infof("successfully initialized netstorage in %.3f seconds", time.Since(startTime).Seconds())
relabel.Init()
storage.SetMaxLabelsPerTimeseries(*maxLabelsPerTimeseries)
storage.SetMaxLabelValueLen(*maxLabelValueLen)
common.StartUnmarshalWorkers()
if len(*clusternativeListenAddr) > 0 {
clusternativeServer = clusternativeserver.MustStart(*clusternativeListenAddr, func(c net.Conn) error {
return clusternative.InsertHandler(c)
})
}
if len(*graphiteListenAddr) > 0 {
graphiteServer = graphiteserver.MustStart(*graphiteListenAddr, *graphiteUseProxyProtocol, func(r io.Reader) error {
return graphite.InsertHandler(nil, r)
})
}
if len(*influxListenAddr) > 0 {
influxServer = influxserver.MustStart(*influxListenAddr, *influxUseProxyProtocol, func(r io.Reader) error {
return influx.InsertHandlerForReader(nil, r)
})
}
if len(*opentsdbListenAddr) > 0 {
opentsdbServer = opentsdbserver.MustStart(*opentsdbListenAddr, *opentsdbUseProxyProtocol, func(r io.Reader) error {
return opentsdb.InsertHandler(nil, r)
}, opentsdbhttp.InsertHandler)
}
if len(*opentsdbHTTPListenAddr) > 0 {
opentsdbhttpServer = opentsdbhttpserver.MustStart(*opentsdbHTTPListenAddr, *opentsdbHTTPUseProxyProtocol, opentsdbhttp.InsertHandler)
}
listenAddrs := *httpListenAddrs
if len(listenAddrs) == 0 {
listenAddrs = []string{":8480"}
}
go httpserver.Serve(listenAddrs, useProxyProtocol, requestHandler)
pushmetrics.Init()
sig := procutil.WaitForSigterm()
logger.Infof("service received signal %s", sig)
pushmetrics.Stop()
logger.Infof("gracefully shutting down http service at %q", listenAddrs)
startTime = time.Now()
if err := httpserver.Stop(listenAddrs); err != nil {
logger.Fatalf("cannot stop http service: %s", err)
}
logger.Infof("successfully shut down http service in %.3f seconds", time.Since(startTime).Seconds())
if len(*clusternativeListenAddr) > 0 {
clusternativeServer.MustStop()
}
if len(*graphiteListenAddr) > 0 {
graphiteServer.MustStop()
}
if len(*influxListenAddr) > 0 {
influxServer.MustStop()
}
if len(*opentsdbListenAddr) > 0 {
opentsdbServer.MustStop()
}
if len(*opentsdbHTTPListenAddr) > 0 {
opentsdbhttpServer.MustStop()
}
common.StopUnmarshalWorkers()
logger.Infof("shutting down neststorage...")
startTime = time.Now()
netstorage.MustStop()
logger.Infof("successfully stopped netstorage in %.3f seconds", time.Since(startTime).Seconds())
fs.MustStopDirRemover()
logger.Infof("the vminsert has been stopped")
}
func requestHandler(w http.ResponseWriter, r *http.Request) bool {
startTime := time.Now()
defer requestDuration.UpdateDuration(startTime)
if r.URL.Path == "/" {
if r.Method != http.MethodGet {
return false
}
w.Header().Add("Content-Type", "text/html; charset=utf-8")
fmt.Fprintf(w, `vminsert - a component of VictoriaMetrics cluster<br/>
<a href="https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html">docs</a><br>
`)
return true
}
p, err := httpserver.ParsePath(r.URL.Path)
if err != nil {
httpserver.Errorf(w, r, "cannot parse path %q: %s", r.URL.Path, err)
return true
}
if p.Prefix != "insert" {
// This is not our link.
return false
}
at, err := auth.NewTokenPossibleMultitenant(p.AuthToken)
if err != nil {
httpserver.Errorf(w, r, "auth error: %s", err)
return true
}
if strings.HasPrefix(p.Suffix, "prometheus/api/v1/import/prometheus") {
prometheusimportRequests.Inc()
if err := prometheusimport.InsertHandler(at, r); err != nil {
prometheusimportErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
statusCode := http.StatusNoContent
if strings.HasPrefix(p.Suffix, "prometheus/api/v1/import/prometheus/metrics/job/") {
// Return 200 status code for pushgateway requests.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3636
statusCode = http.StatusOK
}
w.WriteHeader(statusCode)
return true
}
if strings.HasPrefix(p.Suffix, "datadog/") {
// Trim suffix from paths starting from /datadog/ in order to support legacy DataDog agent.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/2670
p.Suffix = strings.TrimSuffix(p.Suffix, "/")
}
switch p.Suffix {
case "prometheus/", "prometheus", "prometheus/api/v1/write":
if common.HandleVMProtoServerHandshake(w, r) {
return true
}
prometheusWriteRequests.Inc()
if err := promremotewrite.InsertHandler(at, r); err != nil {
prometheusWriteErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
w.WriteHeader(http.StatusNoContent)
return true
case "prometheus/api/v1/import":
vmimportRequests.Inc()
if err := vmimport.InsertHandler(at, r); err != nil {
vmimportErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
w.WriteHeader(http.StatusNoContent)
return true
case "prometheus/api/v1/import/csv":
csvimportRequests.Inc()
if err := csvimport.InsertHandler(at, r); err != nil {
csvimportErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
w.WriteHeader(http.StatusNoContent)
return true
case "prometheus/api/v1/import/native":
nativeimportRequests.Inc()
if err := native.InsertHandler(at, r); err != nil {
nativeimportErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
w.WriteHeader(http.StatusNoContent)
return true
case "influx/write", "influx/api/v2/write":
influxWriteRequests.Inc()
addInfluxResponseHeaders(w)
if err := influx.InsertHandlerForHTTP(at, r); err != nil {
influxWriteErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
w.WriteHeader(http.StatusNoContent)
return true
case "influx/query":
influxQueryRequests.Inc()
addInfluxResponseHeaders(w)
influxutils.WriteDatabaseNames(w)
return true
case "opentelemetry/api/v1/push", "opentelemetry/v1/metrics":
opentelemetryPushRequests.Inc()
writeResponse, err := opentelemetry.InsertHandler(at, r)
if err != nil {
opentelemetryPushErrors.Inc()
}
writeResponse(w, startTime, err)
return true
case "newrelic":
newrelicCheckRequest.Inc()
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(202)
fmt.Fprintf(w, `{"status":"ok"}`)
return true
case "newrelic/inventory/deltas":
newrelicInventoryRequests.Inc()
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(202)
fmt.Fprintf(w, `{"payload":{"version": 1, "state": {}, "reset": "false"}}`)
return true
case "newrelic/infra/v2/metrics/events/bulk":
newrelicWriteRequests.Inc()
if err := newrelic.InsertHandlerForHTTP(at, r); err != nil {
newrelicWriteErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(202)
fmt.Fprintf(w, `{"status":"ok"}`)
return true
case "datadog/api/v1/series":
datadogv1WriteRequests.Inc()
if err := datadogv1.InsertHandlerForHTTP(at, r); err != nil {
datadogv1WriteErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(202)
fmt.Fprintf(w, `{"status":"ok"}`)
return true
case "datadog/api/v2/series":
datadogv2WriteRequests.Inc()
if err := datadogv2.InsertHandlerForHTTP(at, r); err != nil {
datadogv2WriteErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
// See https://docs.datadoghq.com/api/latest/metrics/#submit-metrics
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(202)
fmt.Fprintf(w, `{"status":"ok"}`)
return true
case "datadog/api/beta/sketches":
datadogsketchesWriteRequests.Inc()
if err := datadogsketches.InsertHandlerForHTTP(at, r); err != nil {
datadogsketchesWriteErrors.Inc()
httpserver.Errorf(w, r, "%s", err)
return true
}
w.WriteHeader(202)
return true
case "datadog/api/v1/validate":
datadogValidateRequests.Inc()
// See https://docs.datadoghq.com/api/latest/authentication/#validate-api-key
w.Header().Set("Content-Type", "application/json")
fmt.Fprintf(w, `{"valid":true}`)
return true
case "datadog/api/v1/check_run":
datadogCheckRunRequests.Inc()
// See https://docs.datadoghq.com/api/latest/service-checks/#submit-a-service-check
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(202)
fmt.Fprintf(w, `{"status":"ok"}`)
return true
case "datadog/intake":
datadogIntakeRequests.Inc()
w.Header().Set("Content-Type", "application/json")
fmt.Fprintf(w, `{}`)
return true
case "datadog/api/v1/metadata":
datadogMetadataRequests.Inc()
w.Header().Set("Content-Type", "application/json")
fmt.Fprintf(w, `{}`)
return true
default:
// This is not our link
return false
}
}
func addInfluxResponseHeaders(w http.ResponseWriter) {
// This is needed for some clients, which expect InfluxDB version header.
// See, for example, https://github.com/ntop/ntopng/issues/5449#issuecomment-1005347597
w.Header().Set("X-Influxdb-Version", "1.8.0")
}
var (
requestDuration = metrics.NewHistogram(`vminsert_request_duration_seconds`)
prometheusWriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/", protocol="promremotewrite"}`)
prometheusWriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/", protocol="promremotewrite"}`)
vmimportRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/api/v1/import", protocol="vmimport"}`)
vmimportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/api/v1/import", protocol="vmimport"}`)
csvimportRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/api/v1/import/csv", protocol="csvimport"}`)
csvimportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/api/v1/import/csv", protocol="csvimport"}`)
prometheusimportRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/api/v1/import/prometheus", protocol="prometheusimport"}`)
prometheusimportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/api/v1/import/prometheus", protocol="prometheusimport"}`)
nativeimportRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/api/v1/import/native", protocol="nativeimport"}`)
nativeimportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/api/v1/import/native", protocol="nativeimport"}`)
influxWriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/influx/write", protocol="influx"}`)
influxWriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/influx/write", protocol="influx"}`)
influxQueryRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/influx/query", protocol="influx"}`)
opentelemetryPushRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/opentelemetry/v1/metrics", protocol="opentelemetry"}`)
opentelemetryPushErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/opentelemetry/v1/metrics", protocol="opentelemetry"}`)
newrelicWriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/newrelic/infra/v2/metrics/events/bulk", protocol="newrelic"}`)
newrelicWriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/newrelic/infra/v2/metrics/events/bulk", protocol="newrelic"}`)
newrelicInventoryRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/newrelic/inventory/deltas", protocol="newrelic"}`)
newrelicCheckRequest = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/newrelic", protocol="newrelic"}`)
datadogv1WriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v1/series", protocol="datadog"}`)
datadogv1WriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/datadog/api/v1/series", protocol="datadog"}`)
datadogv2WriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v2/series", protocol="datadog"}`)
datadogv2WriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/datadog/api/v2/series", protocol="datadog"}`)
datadogsketchesWriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/beta/sketches", protocol="datadog"}`)
datadogsketchesWriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/datadog/api/beta/sketches", protocol="datadog"}`)
datadogValidateRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v1/validate", protocol="datadog"}`)
datadogCheckRunRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v1/check_run", protocol="datadog"}`)
datadogIntakeRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/intake", protocol="datadog"}`)
datadogMetadataRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v1/metadata", protocol="datadog"}`)
_ = metrics.NewGauge(`vm_metrics_with_dropped_labels_total`, func() float64 {
return float64(storage.MetricsWithDroppedLabels.Load())
})
_ = metrics.NewGauge(`vm_too_long_label_names_total`, func() float64 {
return float64(storage.TooLongLabelNames.Load())
})
_ = metrics.NewGauge(`vm_too_long_label_values_total`, func() float64 {
return float64(storage.TooLongLabelValues.Load())
})
)
func usage() {
const s = `
vminsert accepts data via popular data ingestion protocols and routes it to vmstorage nodes configured via -storageNode.
See the docs at https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html .
`
flagutil.Usage(s)
}
func checkDuplicates(arr []string) string {
visited := make(map[string]struct{})
for _, s := range arr {
if _, ok := visited[s]; ok {
return s
}
visited[s] = struct{}{}
}
return ""
}
func hasEmptyValues(arr []string) bool {
for _, s := range arr {
if s == "" {
return true
}
}
return false
}