lib/promscrape: extract common auth code to lib/promauth

2024-11-21 14:44:00 +00:00 · 2020-04-13 12:59:05 +03:00 · 2020-04-13 12:59:05 +03:00 · 7fbfef2aee
commit 7fbfef2aee
parent 1ce6c311dd
8 changed files with 329 additions and 350 deletions
--- a/lib/promauth/config.go
+++ b/lib/promauth/config.go
@ -0,0 +1,135 @@
+package promauth
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"fmt"
+	"io/ioutil"
+)
+
+// TLSConfig represents TLS config.
+//
+// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config
+type TLSConfig struct {
+	CAFile             string `yaml:"ca_file"`
+	CertFile           string `yaml:"cert_file"`
+	KeyFile            string `yaml:"key_file"`
+	ServerName         string `yaml:"server_name"`
+	InsecureSkipVerify bool   `yaml:"insecure_skip_verify"`
+}
+
+// BasicAuthConfig represents basic auth config.
+type BasicAuthConfig struct {
+	Username     string `yaml:"username"`
+	Password     string `yaml:"password"`
+	PasswordFile string `yaml:"password_file"`
+}
+
+// Config is auth config.
+type Config struct {
+	// Optional `Authorization` header.
+	//
+	// It may contain `Basic ....` or `Bearer ....` string.
+	Authorization string
+
+	// Optional TLS config
+	TLSRootCA             *x509.CertPool
+	TLSCertificate        *tls.Certificate
+	TLSServerName         string
+	TLSInsecureSkipVerify bool
+}
+
+// NewTLSConfig returns new TLS config for the given ac.
+func (ac *Config) NewTLSConfig() *tls.Config {
+	tlsCfg := &tls.Config{
+		RootCAs:            ac.TLSRootCA,
+		ClientSessionCache: tls.NewLRUClientSessionCache(0),
+	}
+	if ac.TLSCertificate != nil {
+		tlsCfg.Certificates = []tls.Certificate{*ac.TLSCertificate}
+	}
+	tlsCfg.ServerName = ac.TLSServerName
+	tlsCfg.InsecureSkipVerify = ac.TLSInsecureSkipVerify
+	return tlsCfg
+}
+
+// NewConfig creates auth config from the given args.
+func NewConfig(baseDir string, basicAuth *BasicAuthConfig, bearerToken, bearerTokenFile string, tlsConfig *TLSConfig) (*Config, error) {
+	var authorization string
+	if basicAuth != nil {
+		if basicAuth.Username == "" {
+			return nil, fmt.Errorf("missing `username` in `basic_auth` section")
+		}
+		username := basicAuth.Username
+		password := basicAuth.Password
+		if basicAuth.PasswordFile != "" {
+			if basicAuth.Password != "" {
+				return nil, fmt.Errorf("both `password`=%q and `password_file`=%q are set in `basic_auth` section", basicAuth.Password, basicAuth.PasswordFile)
+			}
+			path := getFilepath(baseDir, basicAuth.PasswordFile)
+			pass, err := readPasswordFromFile(path)
+			if err != nil {
+				return nil, fmt.Errorf("cannot read password from `password_file`=%q set in `basic_auth` section: %s", basicAuth.PasswordFile, err)
+			}
+			password = pass
+		}
+		// See https://en.wikipedia.org/wiki/Basic_access_authentication
+		token := username + ":" + password
+		token64 := base64.StdEncoding.EncodeToString([]byte(token))
+		authorization = "Basic " + token64
+	}
+	if bearerTokenFile != "" {
+		if bearerToken != "" {
+			return nil, fmt.Errorf("both `bearer_token`=%q and `bearer_token_file`=%q are set", bearerToken, bearerTokenFile)
+		}
+		path := getFilepath(baseDir, bearerTokenFile)
+		token, err := readPasswordFromFile(path)
+		if err != nil {
+			return nil, fmt.Errorf("cannot read bearer token from `bearer_token_file`=%q: %s", bearerTokenFile, err)
+		}
+		bearerToken = token
+	}
+	if bearerToken != "" {
+		if authorization != "" {
+			return nil, fmt.Errorf("cannot use both `basic_auth` and `bearer_token`")
+		}
+		authorization = "Bearer " + bearerToken
+	}
+	var tlsRootCA *x509.CertPool
+	var tlsCertificate *tls.Certificate
+	tlsServerName := ""
+	tlsInsecureSkipVerify := false
+	if tlsConfig != nil {
+		tlsServerName = tlsConfig.ServerName
+		tlsInsecureSkipVerify = tlsConfig.InsecureSkipVerify
+		if tlsConfig.CertFile != "" || tlsConfig.KeyFile != "" {
+			certPath := getFilepath(baseDir, tlsConfig.CertFile)
+			keyPath := getFilepath(baseDir, tlsConfig.KeyFile)
+			cert, err := tls.LoadX509KeyPair(certPath, keyPath)
+			if err != nil {
+				return nil, fmt.Errorf("cannot load TLS certificate from `cert_file`=%q, `key_file`=%q: %s", tlsConfig.CertFile, tlsConfig.KeyFile, err)
+			}
+			tlsCertificate = &cert
+		}
+		if tlsConfig.CAFile != "" {
+			path := getFilepath(baseDir, tlsConfig.CAFile)
+			data, err := ioutil.ReadFile(path)
+			if err != nil {
+				return nil, fmt.Errorf("cannot read `ca_file` %q: %s", tlsConfig.CAFile, err)
+			}
+			tlsRootCA = x509.NewCertPool()
+			if !tlsRootCA.AppendCertsFromPEM(data) {
+				return nil, fmt.Errorf("cannot parse data from `ca_file` %q", tlsConfig.CAFile)
+			}
+		}
+	}
+	ac := &Config{
+		Authorization:         authorization,
+		TLSRootCA:             tlsRootCA,
+		TLSCertificate:        tlsCertificate,
+		TLSServerName:         tlsServerName,
+		TLSInsecureSkipVerify: tlsInsecureSkipVerify,
+	}
+	return ac, nil
+}
--- a/lib/promauth/util.go
+++ b/lib/promauth/util.go
@ -0,0 +1,24 @@
+package promauth
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+	"unicode"
+)
+
+func getFilepath(baseDir, path string) string {
+	if filepath.IsAbs(path) {
+		return path
+	}
+	return filepath.Join(baseDir, path)
+}
+
+func readPasswordFromFile(path string) (string, error) {
+	data, err := ioutil.ReadFile(path)
+	if err != nil {
+		return "", err
+	}
+	pass := strings.TrimRightFunc(string(data), unicode.IsSpace)
+	return pass, nil
+}
--- a/lib/promscrape/client.go
+++ b/lib/promscrape/client.go
@ -36,7 +36,7 @@ func newClient(sw *ScrapeWork) *client {
 	isTLS := string(u.Scheme()) == "https"
 	var tlsCfg *tls.Config
 	if isTLS {
-		tlsCfg = getTLSConfig(sw)
+		tlsCfg = sw.AuthConfig.NewTLSConfig()
 	}
 	if !strings.Contains(host, ":") {
 		if !isTLS {
@ -64,7 +64,7 @@ func newClient(sw *ScrapeWork) *client {
 		scrapeURL:  sw.ScrapeURL,
 		host:       host,
 		requestURI: requestURI,
-		authHeader: sw.Authorization,
+		authHeader: sw.AuthConfig.Authorization,
 	}
 }

@ -120,16 +120,3 @@ var (
 	scrapesGunzipped    = metrics.NewCounter(`vm_promscrape_scrapes_gunziped_total`)
 	scrapesGunzipFailed = metrics.NewCounter(`vm_promscrape_scrapes_gunzip_failed_total`)
 )
-
-func getTLSConfig(sw *ScrapeWork) *tls.Config {
-	tlsCfg := &tls.Config{
-		RootCAs:            sw.TLSRootCA,
-		ClientSessionCache: tls.NewLRUClientSessionCache(0),
-	}
-	if sw.TLSCertificate != nil {
-		tlsCfg.Certificates = []tls.Certificate{*sw.TLSCertificate}
-	}
-	tlsCfg.ServerName = sw.TLSServerName
-	tlsCfg.InsecureSkipVerify = sw.TLSInsecureSkipVerify
-	return tlsCfg
-}
--- a/lib/promscrape/config.go
+++ b/lib/promscrape/config.go
@ -1,18 +1,15 @@
 package promscrape

 import (
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
 	"fmt"
 	"io/ioutil"
 	"net/url"
 	"path/filepath"
 	"strings"
 	"time"
-	"unicode"

 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
 	"gopkg.in/yaml.v2"
@ -48,10 +45,10 @@ type ScrapeConfig struct {
 	HonorTimestamps      bool                        `yaml:"honor_timestamps"`
 	Scheme               string                      `yaml:"scheme"`
 	Params               map[string][]string         `yaml:"params"`
-	BasicAuth            *BasicAuthConfig            `yaml:"basic_auth"`
+	BasicAuth            *promauth.BasicAuthConfig   `yaml:"basic_auth"`
 	BearerToken          string                      `yaml:"bearer_token"`
 	BearerTokenFile      string                      `yaml:"bearer_token_file"`
-	TLSConfig            *TLSConfig                  `yaml:"tls_config"`
+	TLSConfig            *promauth.TLSConfig         `yaml:"tls_config"`
 	StaticConfigs        []StaticConfig              `yaml:"static_configs"`
 	FileSDConfigs        []FileSDConfig              `yaml:"file_sd_configs"`
 	RelabelConfigs       []promrelabel.RelabelConfig `yaml:"relabel_configs"`
@ -70,24 +67,6 @@ type FileSDConfig struct {
 	// `refresh_interval` is ignored. See `-prometheus.fileSDCheckInterval`
 }

-// TLSConfig represents TLS config.
-//
-// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config
-type TLSConfig struct {
-	CAFile             string `yaml:"ca_file"`
-	CertFile           string `yaml:"cert_file"`
-	KeyFile            string `yaml:"key_file"`
-	ServerName         string `yaml:"server_name"`
-	InsecureSkipVerify bool   `yaml:"insecure_skip_verify"`
-}
-
-// BasicAuthConfig represents basic auth config.
-type BasicAuthConfig struct {
-	Username     string `yaml:"username"`
-	Password     string `yaml:"password"`
-	PasswordFile string `yaml:"password_file"`
-}
-
 // StaticConfig represents essential parts for `static_config` section of Prometheus config.
 //
 // See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#static_config
@ -150,36 +129,7 @@ func (cfg *Config) fileSDConfigsCount() int {
 }

 // getFileSDScrapeWork returns `file_sd_configs` ScrapeWork from cfg.
-func (cfg *Config) getFileSDScrapeWork(prev []ScrapeWork) ([]ScrapeWork, error) {
-	var sws []ScrapeWork
-	for i := range cfg.ScrapeConfigs {
-		var err error
-		sws, err = cfg.ScrapeConfigs[i].appendFileSDScrapeWork(sws, prev, cfg.baseDir)
-		if err != nil {
-			return nil, fmt.Errorf("error when parsing `scrape_config` #%d: %s", i+1, err)
-		}
-	}
-	return sws, nil
-}
-
-// getStaticScrapeWork returns `static_configs` ScrapeWork from from cfg.
-func (cfg *Config) getStaticScrapeWork() ([]ScrapeWork, error) {
-	var sws []ScrapeWork
-	for i := range cfg.ScrapeConfigs {
-		var err error
-		sws, err = cfg.ScrapeConfigs[i].appendStaticScrapeWork(sws)
-		if err != nil {
-			return nil, fmt.Errorf("error when parsing `scrape_config` #%d: %s", i+1, err)
-		}
-	}
-	return sws, nil
-}
-
-func (sc *ScrapeConfig) appendFileSDScrapeWork(dst, prev []ScrapeWork, baseDir string) ([]ScrapeWork, error) {
-	if len(sc.FileSDConfigs) == 0 {
-		// Fast path - no `file_sd_configs`
-		return dst, nil
-	}
+func (cfg *Config) getFileSDScrapeWork(prev []ScrapeWork) []ScrapeWork {
 	// Create a map for the previous scrape work.
 	swPrev := make(map[string][]ScrapeWork)
 	for i := range prev {
@ -191,25 +141,24 @@ func (sc *ScrapeConfig) appendFileSDScrapeWork(dst, prev []ScrapeWork, baseDir s
 			swPrev[label.Value] = append(swPrev[label.Value], *sw)
 		}
 	}
-	for i := range sc.FileSDConfigs {
-		var err error
-		dst, err = sc.FileSDConfigs[i].appendScrapeWork(dst, swPrev, baseDir, sc.swc)
-		if err != nil {
-			return nil, fmt.Errorf("error when parsing `file_sd_config` #%d: %s", i+1, err)
+	var dst []ScrapeWork
+	for _, sc := range cfg.ScrapeConfigs {
+		for _, sdc := range sc.FileSDConfigs {
+			dst = sdc.appendScrapeWork(dst, swPrev, cfg.baseDir, sc.swc)
 		}
 	}
-	return dst, nil
+	return dst
 }

-func (sc *ScrapeConfig) appendStaticScrapeWork(dst []ScrapeWork) ([]ScrapeWork, error) {
-	for i := range sc.StaticConfigs {
-		var err error
-		dst, err = sc.StaticConfigs[i].appendScrapeWork(dst, sc.swc)
-		if err != nil {
-			return nil, fmt.Errorf("error when parsing `static_config` #%d: %s", i+1, err)
+// getStaticScrapeWork returns `static_configs` ScrapeWork from from cfg.
+func (cfg *Config) getStaticScrapeWork() []ScrapeWork {
+	var dst []ScrapeWork
+	for _, sc := range cfg.ScrapeConfigs {
+		for _, stc := range sc.StaticConfigs {
+			dst = stc.appendScrapeWork(dst, sc.swc, nil)
 		}
 	}
-	return dst, nil
+	return dst
 }

 func getScrapeWorkConfig(sc *ScrapeConfig, baseDir string, globalCfg *GlobalConfig) (*scrapeWorkConfig, error) {
@ -245,79 +194,10 @@ func getScrapeWorkConfig(sc *ScrapeConfig, baseDir string, globalCfg *GlobalConf
 		return nil, fmt.Errorf("unexpected `scheme` for `job_name` %q: %q; supported values: http or https", jobName, scheme)
 	}
 	params := sc.Params
-	var authorization string
-	if sc.BasicAuth != nil {
-		if sc.BasicAuth.Username == "" {
-			return nil, fmt.Errorf("missing `username` in `basic_auth` section for `job_name` %q", jobName)
-		}
-		username := sc.BasicAuth.Username
-		password := sc.BasicAuth.Password
-		if sc.BasicAuth.PasswordFile != "" {
-			if sc.BasicAuth.Password != "" {
-				return nil, fmt.Errorf("both `password`=%q and `password_file`=%q are set in `basic_auth` section for `job_name` %q",
-					sc.BasicAuth.Password, sc.BasicAuth.PasswordFile, jobName)
-			}
-			path := getFilepath(baseDir, sc.BasicAuth.PasswordFile)
-			pass, err := readPasswordFromFile(path)
-			if err != nil {
-				return nil, fmt.Errorf("cannot read password from `password_file`=%q set in `basic_auth` section for `job_name` %q: %s",
-					sc.BasicAuth.PasswordFile, jobName, err)
-			}
-			password = pass
-		}
-		// See https://en.wikipedia.org/wiki/Basic_access_authentication
-		token := username + ":" + password
-		token64 := base64.StdEncoding.EncodeToString([]byte(token))
-		authorization = "Basic " + token64
+	ac, err := promauth.NewConfig(baseDir, sc.BasicAuth, sc.BearerToken, sc.BearerTokenFile, sc.TLSConfig)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse auth config for `job_name` %q: %s", jobName, err)
 	}
-	bearerToken := sc.BearerToken
-	if sc.BearerTokenFile != "" {
-		if sc.BearerToken != "" {
-			return nil, fmt.Errorf("both `bearer_token`=%q and `bearer_token_file`=%q are set for `job_name` %q", sc.BearerToken, sc.BearerTokenFile, jobName)
-		}
-		path := getFilepath(baseDir, sc.BearerTokenFile)
-		token, err := readPasswordFromFile(path)
-		if err != nil {
-			return nil, fmt.Errorf("cannot read bearer token from `bearer_token_file`=%q for `job_name` %q: %s", sc.BearerTokenFile, jobName, err)
-		}
-		bearerToken = token
-	}
-	if bearerToken != "" {
-		if authorization != "" {
-			return nil, fmt.Errorf("cannot use both `basic_auth` and `bearer_token` for `job_name` %q", jobName)
-		}
-		authorization = "Bearer " + bearerToken
-	}
-	var tlsRootCA *x509.CertPool
-	var tlsCertificate *tls.Certificate
-	tlsServerName := ""
-	tlsInsecureSkipVerify := false
-	if sc.TLSConfig != nil {
-		tlsServerName = sc.TLSConfig.ServerName
-		tlsInsecureSkipVerify = sc.TLSConfig.InsecureSkipVerify
-		if sc.TLSConfig.CertFile != "" || sc.TLSConfig.KeyFile != "" {
-			certPath := getFilepath(baseDir, sc.TLSConfig.CertFile)
-			keyPath := getFilepath(baseDir, sc.TLSConfig.KeyFile)
-			cert, err := tls.LoadX509KeyPair(certPath, keyPath)
-			if err != nil {
-				return nil, fmt.Errorf("cannot load TLS certificate for `job_name` %q from `cert_file`=%q, `key_file`=%q: %s",
-					jobName, sc.TLSConfig.CertFile, sc.TLSConfig.KeyFile, err)
-			}
-			tlsCertificate = &cert
-		}
-		if sc.TLSConfig.CAFile != "" {
-			path := getFilepath(baseDir, sc.TLSConfig.CAFile)
-			data, err := ioutil.ReadFile(path)
-			if err != nil {
-				return nil, fmt.Errorf("cannot read `ca_file` %q for `job_name` %q: %s", sc.TLSConfig.CAFile, jobName, err)
-			}
-			tlsRootCA = x509.NewCertPool()
-			if !tlsRootCA.AppendCertsFromPEM(data) {
-				return nil, fmt.Errorf("cannot parse data from `ca_file` %q for `job_name` %q", sc.TLSConfig.CAFile, jobName)
-			}
-		}
-	}
-	var err error
 	var relabelConfigs []promrelabel.ParsedRelabelConfig
 	relabelConfigs, err = promrelabel.ParseRelabelConfigs(relabelConfigs[:0], sc.RelabelConfigs)
 	if err != nil {
@ -330,49 +210,40 @@ func getScrapeWorkConfig(sc *ScrapeConfig, baseDir string, globalCfg *GlobalConf
 	}
 	scrapeLimit := sc.ScrapeLimit
 	swc := &scrapeWorkConfig{
-		scrapeInterval:        scrapeInterval,
-		scrapeTimeout:         scrapeTimeout,
-		jobName:               jobName,
-		metricsPath:           metricsPath,
-		scheme:                scheme,
-		params:                params,
-		authorization:         authorization,
-		honorLabels:           honorLabels,
-		honorTimestamps:       honorTimestamps,
-		externalLabels:        globalCfg.ExternalLabels,
-		tlsRootCA:             tlsRootCA,
-		tlsCertificate:        tlsCertificate,
-		tlsServerName:         tlsServerName,
-		tlsInsecureSkipVerify: tlsInsecureSkipVerify,
-		relabelConfigs:        relabelConfigs,
-		metricRelabelConfigs:  metricRelabelConfigs,
-		scrapeLimit:           scrapeLimit,
+		scrapeInterval:       scrapeInterval,
+		scrapeTimeout:        scrapeTimeout,
+		jobName:              jobName,
+		metricsPath:          metricsPath,
+		scheme:               scheme,
+		params:               params,
+		authConfig:           ac,
+		honorLabels:          honorLabels,
+		honorTimestamps:      honorTimestamps,
+		externalLabels:       globalCfg.ExternalLabels,
+		relabelConfigs:       relabelConfigs,
+		metricRelabelConfigs: metricRelabelConfigs,
+		scrapeLimit:          scrapeLimit,
 	}
 	return swc, nil
 }

 type scrapeWorkConfig struct {
-	scrapeInterval        time.Duration
-	scrapeTimeout         time.Duration
-	jobName               string
-	metricsPath           string
-	scheme                string
-	params                map[string][]string
-	authorization         string
-	honorLabels           bool
-	honorTimestamps       bool
-	externalLabels        map[string]string
-	tlsRootCA             *x509.CertPool
-	tlsCertificate        *tls.Certificate
-	tlsServerName         string
-	tlsInsecureSkipVerify bool
-	relabelConfigs        []promrelabel.ParsedRelabelConfig
-	metricRelabelConfigs  []promrelabel.ParsedRelabelConfig
-	scrapeLimit           int
-	metaLabels            map[string]string
+	scrapeInterval       time.Duration
+	scrapeTimeout        time.Duration
+	jobName              string
+	metricsPath          string
+	scheme               string
+	params               map[string][]string
+	authConfig           *promauth.Config
+	honorLabels          bool
+	honorTimestamps      bool
+	externalLabels       map[string]string
+	relabelConfigs       []promrelabel.ParsedRelabelConfig
+	metricRelabelConfigs []promrelabel.ParsedRelabelConfig
+	scrapeLimit          int
 }

-func (sdc *FileSDConfig) appendScrapeWork(dst []ScrapeWork, swPrev map[string][]ScrapeWork, baseDir string, swc *scrapeWorkConfig) ([]ScrapeWork, error) {
+func (sdc *FileSDConfig) appendScrapeWork(dst []ScrapeWork, swPrev map[string][]ScrapeWork, baseDir string, swc *scrapeWorkConfig) []ScrapeWork {
 	for _, file := range sdc.Files {
 		pathPattern := getFilepath(baseDir, file)
 		paths := []string{pathPattern}
@ -380,7 +251,9 @@ func (sdc *FileSDConfig) appendScrapeWork(dst []ScrapeWork, swPrev map[string][]
 			var err error
 			paths, err = filepath.Glob(pathPattern)
 			if err != nil {
-				return nil, fmt.Errorf("invalid pattern %q in `files` section: %s", file, err)
+				// Do not return this error, since other files may contain valid scrape configs.
+				logger.Errorf("invalid pattern %q in `files` section: %s; skipping it", file, err)
+				continue
 			}
 		}
 		for _, path := range paths {
@ -396,7 +269,6 @@ func (sdc *FileSDConfig) appendScrapeWork(dst []ScrapeWork, swPrev map[string][]
 				}
 				continue
 			}
-			swcCopy := *swc
 			pathShort := path
 			if strings.HasPrefix(pathShort, baseDir) {
 				pathShort = path[len(baseDir):]
@ -404,88 +276,89 @@ func (sdc *FileSDConfig) appendScrapeWork(dst []ScrapeWork, swPrev map[string][]
 					pathShort = pathShort[1:]
 				}
 			}
-			swcCopy.metaLabels = map[string]string{
+			metaLabels := map[string]string{
 				"__meta_filepath": pathShort,
 			}
 			for i := range stcs {
-				dst, err = stcs[i].appendScrapeWork(dst, &swcCopy)
-				if err != nil {
-					// Do not return this error, since other paths may contain valid scrape configs.
-					logger.Errorf("error when parsing `static_config` #%d from %q: %s", i+1, path, err)
-					continue
-				}
+				dst = stcs[i].appendScrapeWork(dst, swc, metaLabels)
 			}
 		}
 	}
-	return dst, nil
+	return dst
 }

-func (stc *StaticConfig) appendScrapeWork(dst []ScrapeWork, swc *scrapeWorkConfig) ([]ScrapeWork, error) {
+func (stc *StaticConfig) appendScrapeWork(dst []ScrapeWork, swc *scrapeWorkConfig, metaLabels map[string]string) []ScrapeWork {
 	for _, target := range stc.Targets {
 		if target == "" {
-			return nil, fmt.Errorf("`static_configs` target for `job_name` %q cannot be empty", swc.jobName)
+			// Do not return this error, since other targets may be valid
+			logger.Errorf("`static_configs` target for `job_name` %q cannot be empty; skipping it", swc.jobName)
+			continue
 		}
-		labels, err := mergeLabels(swc.jobName, swc.scheme, target, swc.metricsPath, stc.Labels, swc.externalLabels, swc.metaLabels, swc.params)
+		var err error
+		dst, err = appendScrapeWork(dst, swc, target, stc.Labels, metaLabels)
 		if err != nil {
-			return nil, fmt.Errorf("cannot merge labels for `static_configs` target for `job_name` %q: %s", swc.jobName, err)
-		}
-		labels = promrelabel.ApplyRelabelConfigs(labels, 0, swc.relabelConfigs, false)
-		if len(labels) == 0 {
-			// Drop target without labels.
+			// Do not return this error, since other targets may be valid
+			logger.Errorf("error when parsing `static_configs` target %q for `job_name` %q: %s; skipping it", target, swc.jobName, err)
 			continue
 		}
-		// See https://www.robustperception.io/life-of-a-label
-		schemeRelabeled := ""
-		if schemeLabel := promrelabel.GetLabelByName(labels, "__scheme__"); schemeLabel != nil {
-			schemeRelabeled = schemeLabel.Value
-		}
-		if schemeRelabeled == "" {
-			schemeRelabeled = "http"
-		}
-		addressLabel := promrelabel.GetLabelByName(labels, "__address__")
-		if addressLabel == nil || addressLabel.Name == "" {
-			// Drop target without scrape address.
-			continue
-		}
-		targetRelabeled := addMissingPort(schemeRelabeled, addressLabel.Value)
-		if strings.Contains(targetRelabeled, "/") {
-			// Drop target with '/'
-			continue
-		}
-		metricsPathRelabeled := ""
-		if metricsPathLabel := promrelabel.GetLabelByName(labels, "__metrics_path__"); metricsPathLabel != nil {
-			metricsPathRelabeled = metricsPathLabel.Value
-		}
-		if metricsPathRelabeled == "" {
-			metricsPathRelabeled = "/metrics"
-		}
-		paramsRelabeled := getParamsFromLabels(labels, swc.params)
-		optionalQuestion := "?"
-		if len(paramsRelabeled) == 0 || strings.Contains(metricsPathRelabeled, "?") {
-			optionalQuestion = ""
-		}
-		paramsStr := url.Values(paramsRelabeled).Encode()
-		scrapeURL := fmt.Sprintf("%s://%s%s%s%s", schemeRelabeled, targetRelabeled, metricsPathRelabeled, optionalQuestion, paramsStr)
-		if _, err := url.Parse(scrapeURL); err != nil {
-			return nil, fmt.Errorf("invalid url %q for scheme=%q (%q), target=%q (%q), metrics_path=%q (%q) for `job_name` %q: %s",
-				scrapeURL, swc.scheme, schemeRelabeled, target, targetRelabeled, swc.metricsPath, metricsPathRelabeled, swc.jobName, err)
-		}
-		dst = append(dst, ScrapeWork{
-			ScrapeURL:             scrapeURL,
-			ScrapeInterval:        swc.scrapeInterval,
-			ScrapeTimeout:         swc.scrapeTimeout,
-			HonorLabels:           swc.honorLabels,
-			HonorTimestamps:       swc.honorTimestamps,
-			Labels:                labels,
-			Authorization:         swc.authorization,
-			TLSRootCA:             swc.tlsRootCA,
-			TLSCertificate:        swc.tlsCertificate,
-			TLSServerName:         swc.tlsServerName,
-			TLSInsecureSkipVerify: swc.tlsInsecureSkipVerify,
-			MetricRelabelConfigs:  swc.metricRelabelConfigs,
-			ScrapeLimit:           swc.scrapeLimit,
-		})
 	}
+	return dst
+}
+
+func appendScrapeWork(dst []ScrapeWork, swc *scrapeWorkConfig, target string, extraLabels, metaLabels map[string]string) ([]ScrapeWork, error) {
+	labels := mergeLabels(swc.jobName, swc.scheme, target, swc.metricsPath, extraLabels, swc.externalLabels, metaLabels, swc.params)
+	labels = promrelabel.ApplyRelabelConfigs(labels, 0, swc.relabelConfigs, false)
+	if len(labels) == 0 {
+		// Drop target without labels.
+		return dst, nil
+	}
+	// See https://www.robustperception.io/life-of-a-label
+	schemeRelabeled := ""
+	if schemeLabel := promrelabel.GetLabelByName(labels, "__scheme__"); schemeLabel != nil {
+		schemeRelabeled = schemeLabel.Value
+	}
+	if schemeRelabeled == "" {
+		schemeRelabeled = "http"
+	}
+	addressLabel := promrelabel.GetLabelByName(labels, "__address__")
+	if addressLabel == nil || addressLabel.Name == "" {
+		// Drop target without scrape address.
+		return dst, nil
+	}
+	targetRelabeled := addMissingPort(schemeRelabeled, addressLabel.Value)
+	if strings.Contains(targetRelabeled, "/") {
+		// Drop target with '/'
+		return dst, nil
+	}
+	metricsPathRelabeled := ""
+	if metricsPathLabel := promrelabel.GetLabelByName(labels, "__metrics_path__"); metricsPathLabel != nil {
+		metricsPathRelabeled = metricsPathLabel.Value
+	}
+	if metricsPathRelabeled == "" {
+		metricsPathRelabeled = "/metrics"
+	}
+	paramsRelabeled := getParamsFromLabels(labels, swc.params)
+	optionalQuestion := "?"
+	if len(paramsRelabeled) == 0 || strings.Contains(metricsPathRelabeled, "?") {
+		optionalQuestion = ""
+	}
+	paramsStr := url.Values(paramsRelabeled).Encode()
+	scrapeURL := fmt.Sprintf("%s://%s%s%s%s", schemeRelabeled, targetRelabeled, metricsPathRelabeled, optionalQuestion, paramsStr)
+	if _, err := url.Parse(scrapeURL); err != nil {
+		return dst, fmt.Errorf("invalid url %q for scheme=%q (%q), target=%q (%q), metrics_path=%q (%q) for `job_name` %q: %s",
+			scrapeURL, swc.scheme, schemeRelabeled, target, targetRelabeled, swc.metricsPath, metricsPathRelabeled, swc.jobName, err)
+	}
+	dst = append(dst, ScrapeWork{
+		ScrapeURL:            scrapeURL,
+		ScrapeInterval:       swc.scrapeInterval,
+		ScrapeTimeout:        swc.scrapeTimeout,
+		HonorLabels:          swc.honorLabels,
+		HonorTimestamps:      swc.honorTimestamps,
+		Labels:               labels,
+		AuthConfig:           swc.authConfig,
+		MetricRelabelConfigs: swc.metricRelabelConfigs,
+		ScrapeLimit:          swc.scrapeLimit,
+	})
 	return dst, nil
 }

@ -507,7 +380,7 @@ func getParamsFromLabels(labels []prompbmarshal.Label, paramsOrig map[string][]s
 	return m
 }

-func mergeLabels(job, scheme, target, metricsPath string, labels, externalLabels, metaLabels map[string]string, params map[string][]string) ([]prompbmarshal.Label, error) {
+func mergeLabels(job, scheme, target, metricsPath string, extraLabels, externalLabels, metaLabels map[string]string, params map[string][]string) []prompbmarshal.Label {
 	// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config
 	m := make(map[string]string)
 	for k, v := range externalLabels {
@ -525,7 +398,7 @@ func mergeLabels(job, scheme, target, metricsPath string, labels, externalLabels
 		v := args[0]
 		m[k] = v
 	}
-	for k, v := range labels {
+	for k, v := range extraLabels {
 		m[k] = v
 	}
 	for k, v := range metaLabels {
@ -538,7 +411,7 @@ func mergeLabels(job, scheme, target, metricsPath string, labels, externalLabels
 			Value: v,
 		})
 	}
-	return result, nil
+	return result
 }

 func getFilepath(baseDir, path string) string {
@ -548,15 +421,6 @@ func getFilepath(baseDir, path string) string {
 	return filepath.Join(baseDir, path)
 }

-func readPasswordFromFile(path string) (string, error) {
-	data, err := ioutil.ReadFile(path)
-	if err != nil {
-		return "", err
-	}
-	pass := strings.TrimRightFunc(string(data), unicode.IsSpace)
-	return pass, nil
-}
-
 func addMissingPort(scheme, target string) string {
 	if strings.Contains(target, ":") {
 		return target
--- a/lib/promscrape/config_test.go
+++ b/lib/promscrape/config_test.go
@ -8,6 +8,7 @@ import (
 	"testing"
 	"time"

+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
 )
@ -79,10 +80,7 @@ scrape_configs:
 	if err := cfg.parse([]byte(data), "sss"); err != nil {
 		t.Fatalf("cannot parase data: %s", err)
 	}
-	sws, err := cfg.getFileSDScrapeWork(nil)
-	if err != nil {
-		t.Fatalf("cannot obtain `file_sd_config`: %s", err)
-	}
+	sws := cfg.getFileSDScrapeWork(nil)
 	if !equalStaticConfigForScrapeWorks(sws, sws) {
 		t.Fatalf("unexpected non-equal static configs;\nsws:\n%#v", sws)
 	}
@ -98,10 +96,7 @@ scrape_configs:
 	if err := cfgNew.parse([]byte(dataNew), "sss"); err != nil {
 		t.Fatalf("cannot parse data: %s", err)
 	}
-	swsNew, err := cfgNew.getFileSDScrapeWork(sws)
-	if err != nil {
-		t.Fatalf("cannot obtain `file_sd_config`: %s", err)
-	}
+	swsNew := cfgNew.getFileSDScrapeWork(sws)
 	if equalStaticConfigForScrapeWorks(swsNew, sws) {
 		t.Fatalf("unexpected equal static configs;\nswsNew:\n%#v\nsws:\n%#v", swsNew, sws)
 	}
@ -116,10 +111,7 @@ scrape_configs:
 	if err := cfg.parse([]byte(data), "sss"); err != nil {
 		t.Fatalf("cannot parse data: %s", err)
 	}
-	sws, err = cfg.getFileSDScrapeWork(swsNew)
-	if err != nil {
-		t.Fatalf("unexpected error: %s", err)
-	}
+	sws = cfg.getFileSDScrapeWork(swsNew)
 	if len(sws) != 0 {
 		t.Fatalf("unexpected non-empty sws:\n%#v", sws)
 	}
@ -134,10 +126,7 @@ scrape_configs:
 	if err := cfg.parse([]byte(data), "sss"); err != nil {
 		t.Fatalf("cannot parse data: %s", err)
 	}
-	sws, err = cfg.getFileSDScrapeWork(swsNew)
-	if err != nil {
-		t.Fatalf("unexpected error: %s", err)
-	}
+	sws = cfg.getFileSDScrapeWork(swsNew)
 	if len(sws) != 0 {
 		t.Fatalf("unexpected non-empty sws:\n%#v", sws)
 	}
@ -148,7 +137,7 @@ func getFileSDScrapeWork(data []byte, path string) ([]ScrapeWork, error) {
 	if err := cfg.parse(data, path); err != nil {
 		return nil, fmt.Errorf("cannot parse data: %s", err)
 	}
-	return cfg.getFileSDScrapeWork(nil)
+	return cfg.getFileSDScrapeWork(nil), nil
 }

 func getStaticScrapeWork(data []byte, path string) ([]ScrapeWork, error) {
@ -156,7 +145,7 @@ func getStaticScrapeWork(data []byte, path string) ([]ScrapeWork, error) {
 	if err := cfg.parse(data, path); err != nil {
 		return nil, fmt.Errorf("cannot parse data: %s", err)
 	}
-	return cfg.getStaticScrapeWork()
+	return cfg.getStaticScrapeWork(), nil
 }

 func TestGetStaticScrapeWorkFailure(t *testing.T) {
@ -190,22 +179,6 @@ scrape_configs:
  - targets: ["foo"]
 `)

-	// Empty target
-	f(`
-scrape_configs:
- job_name: x
-  static_configs:
-  - targets: ["foo", ""]
-`)
-
-	// Invalid url
-	f(`
-scrape_configs:
- job_name: x
-  static_configs:
-  - targets: ["a b"]
-`)
-
 	// Missing username in `basic_auth`
 	f(`
 scrape_configs:
@ -456,6 +429,7 @@ scrape_configs:
 					Value: "rty",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 		{
 			ScrapeURL:       "http://host2:80/abc/de",
@ -489,6 +463,7 @@ scrape_configs:
 					Value: "rty",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 		{
 			ScrapeURL:       "http://localhost:9090/abc/de",
@ -522,6 +497,7 @@ scrape_configs:
 					Value: "test",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 	})
 }
@ -568,6 +544,7 @@ scrape_configs:
 					Value: "foo",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 	})
 	f(`
@ -612,6 +589,7 @@ scrape_configs:
 					Value: "xxx",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 	})
 	f(`
@ -676,7 +654,9 @@ scrape_configs:
 					Value: "y",
 				},
 			},
-			Authorization: "Bearer xyz",
+			AuthConfig: &promauth.Config{
+				Authorization: "Bearer xyz",
+			},
 		},
 		{
 			ScrapeURL:       "https://aaa:443/foo/bar?p=x%26y&p=%3D",
@ -710,7 +690,9 @@ scrape_configs:
 					Value: "y",
 				},
 			},
-			Authorization: "Bearer xyz",
+			AuthConfig: &promauth.Config{
+				Authorization: "Bearer xyz",
+			},
 		},
 		{
 			ScrapeURL:       "http://1.2.3.4:80/metrics",
@ -736,9 +718,11 @@ scrape_configs:
 					Value: "qwer",
 				},
 			},
-			Authorization:         "Basic dXNlcjpwYXNz",
-			TLSServerName:         "foobar",
-			TLSInsecureSkipVerify: true,
+			AuthConfig: &promauth.Config{
+				Authorization:         "Basic dXNlcjpwYXNz",
+				TLSServerName:         "foobar",
+				TLSInsecureSkipVerify: true,
+			},
 		},
 	})
 	f(`
@ -807,6 +791,7 @@ scrape_configs:
 					Value: "http://foo.bar:1234/metrics",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 	})
 	f(`
@ -867,6 +852,7 @@ scrape_configs:
 					Value: "https",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 	})
 	f(`
@ -904,6 +890,7 @@ scrape_configs:
 					Value: "3",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 	})
 	f(`
@ -937,6 +924,7 @@ scrape_configs:
 					Value: "foo",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 			MetricRelabelConfigs: []promrelabel.ParsedRelabelConfig{
 				{
 					SourceLabels: []string{"foo"},
@ -980,7 +968,9 @@ scrape_configs:
 					Value: "foo",
 				},
 			},
-			Authorization: "Basic eHl6OnNlY3JldC1wYXNz",
+			AuthConfig: &promauth.Config{
+				Authorization: "Basic eHl6OnNlY3JldC1wYXNz",
+			},
 		},
 	})
 	f(`
@ -1012,7 +1002,9 @@ scrape_configs:
 					Value: "foo",
 				},
 			},
-			Authorization: "Bearer secret-pass",
+			AuthConfig: &promauth.Config{
+				Authorization: "Bearer secret-pass",
+			},
 		},
 	})
 	snakeoilCert, err := tls.LoadX509KeyPair("testdata/ssl-cert-snakeoil.pem", "testdata/ssl-cert-snakeoil.key")
@ -1050,7 +1042,9 @@ scrape_configs:
 					Value: "foo",
 				},
 			},
-			TLSCertificate: &snakeoilCert,
+			AuthConfig: &promauth.Config{
+				TLSCertificate: &snakeoilCert,
+			},
 		},
 	})
 	f(`
@ -1107,6 +1101,7 @@ scrape_configs:
 					Value: "qwe",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 	})
 	f(`
@ -1160,6 +1155,7 @@ scrape_configs:
 					Value: "snmp",
 				},
 			},
+			AuthConfig: &promauth.Config{},
 		},
 	})
 }
--- a/lib/promscrape/scraper.go
+++ b/lib/promscrape/scraper.go
@ -56,14 +56,8 @@ func runScraper(configFile string, pushData func(wr *prompbmarshal.WriteRequest)
 	if err != nil {
 		logger.Fatalf("cannot read %q: %s", configFile, err)
 	}
-	swsStatic, err := cfg.getStaticScrapeWork()
-	if err != nil {
-		logger.Fatalf("cannot parse `static_configs` from %q: %s", configFile, err)
-	}
-	swsFileSD, err := cfg.getFileSDScrapeWork(nil)
-	if err != nil {
-		logger.Fatalf("cannot parse `file_sd_config` from %q: %s", configFile, err)
-	}
+	swsStatic := cfg.getStaticScrapeWork()
+	swsFileSD := cfg.getFileSDScrapeWork(nil)

 	mustStop := false
 	for !mustStop {
@ -89,18 +83,9 @@ func runScraper(configFile string, pushData func(wr *prompbmarshal.WriteRequest)
 				logger.Errorf("cannot read %q: %s; continuing with the previous config", configFile, err)
 				goto waitForChans
 			}
-			swsStaticNew, err := cfgNew.getStaticScrapeWork()
-			if err != nil {
-				logger.Errorf("cannot parse `static_configs` from %q: %s; continuing with the previous config", configFile, err)
-				goto waitForChans
-			}
-			swsFileSDNew, err := cfgNew.getFileSDScrapeWork(swsFileSD)
-			if err != nil {
-				logger.Errorf("cannot parse `file_sd_config` from %q: %s; continuing with the previous config", configFile, err)
-			}
 			cfg = cfgNew
-			swsStatic = swsStaticNew
-			swsFileSD = swsFileSDNew
+			swsStatic = cfg.getStaticScrapeWork()
+			swsFileSD = cfg.getFileSDScrapeWork(swsFileSD)
 		case <-globalStopCh:
 			mustStop = true
 		}
@ -151,10 +136,7 @@ func runFileSDScrapers(sws []ScrapeWork, cfg *Config, pushData func(wr *prompbma
 	waitForChans:
 		select {
 		case <-ticker.C:
-			swsNew, err := cfg.getFileSDScrapeWork(sws)
-			if err != nil {
-				logger.Panicf("BUG: error when re-reading `file_sd_config` targets the second time: %s", err)
-			}
+			swsNew := cfg.getFileSDScrapeWork(sws)
 			if equalStaticConfigForScrapeWorks(swsNew, sws) {
 				// Nothing changed, continue waiting for updated scrape work
 				goto waitForChans
@ -173,7 +155,7 @@ func runFileSDScrapers(sws []ScrapeWork, cfg *Config, pushData func(wr *prompbma

 var (
 	fileSDTargets = metrics.NewCounter(`vm_promscrape_targets{type="file_sd"}`)
-	fileSDReloads = metrics.NewCounter(`vm_promscrape_file_sd_reloads_total`)
+	fileSDReloads = metrics.NewCounter(`vm_promscrape_reloads_total{type="file_sd"}`)
 )

 func equalStaticConfigForScrapeWorks(as, bs []ScrapeWork) bool {
--- a/lib/promscrape/scrapework.go
+++ b/lib/promscrape/scrapework.go
@ -1,13 +1,12 @@
 package promscrape

 import (
-	"crypto/tls"
-	"crypto/x509"
 	"math/rand"
 	"time"

 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
 	parser "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/prometheus"
@ -48,16 +47,8 @@ type ScrapeWork struct {
 	// See also https://prometheus.io/docs/concepts/jobs_instances/
 	Labels []prompbmarshal.Label

-	// Optional `Authorization` header.
-	//
-	// It may contain `Basic ....` or `Bearer ....` string.
-	Authorization string
-
-	// Optional TLS config
-	TLSRootCA             *x509.CertPool
-	TLSCertificate        *tls.Certificate
-	TLSServerName         string
-	TLSInsecureSkipVerify bool
+	// Auth config
+	AuthConfig *promauth.Config

 	// Optional `metric_relabel_configs`.
 	MetricRelabelConfigs []promrelabel.ParsedRelabelConfig
--- a/lib/promscrape/testdata/empty_target_file_sd.yml
+++ b/lib/promscrape/testdata/empty_target_file_sd.yml
@ -1 +1 @@
- targets: ["foo", ""]
+- targets: [""]