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config.go
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config.go
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package promscrape
import (
"flag"
"fmt"
"io/ioutil"
"net/url"
"os"
"path/filepath"
"strings"
"sync/atomic"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/consul"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dns"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/ec2"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/gce"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/kubernetes"
"gopkg.in/yaml.v2"
)
var (
strictParse = flag.Bool("promscrape.config.strictParse", false, "Whether to allow only supported fields in '-promscrape.config'. "+
"This option may be used for errors detection in '-promscrape.config' file")
dryRun = flag.Bool("promscrape.config.dryRun", false, "Checks -promscrape.config file for errors and unsupported fields and then exits. "+
"Returns non-zero exit code on parsing errors and emits these errors to stderr. "+
"Pass -loggerLevel=ERROR if you don't need to see info messages in the output")
)
// Config represents essential parts from Prometheus config defined at https://prometheus.io/docs/prometheus/latest/configuration/configuration/
type Config struct {
Global GlobalConfig `yaml:"global"`
ScrapeConfigs []ScrapeConfig `yaml:"scrape_configs"`
// This is set to the directory from where the config has been loaded.
baseDir string
}
// GlobalConfig represents essential parts for `global` section of Prometheus config.
//
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/
type GlobalConfig struct {
ScrapeInterval time.Duration `yaml:"scrape_interval"`
ScrapeTimeout time.Duration `yaml:"scrape_timeout"`
ExternalLabels map[string]string `yaml:"external_labels"`
}
// ScrapeConfig represents essential parts for `scrape_config` section of Prometheus config.
//
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
type ScrapeConfig struct {
JobName string `yaml:"job_name"`
ScrapeInterval time.Duration `yaml:"scrape_interval"`
ScrapeTimeout time.Duration `yaml:"scrape_timeout"`
MetricsPath string `yaml:"metrics_path"`
HonorLabels bool `yaml:"honor_labels"`
HonorTimestamps bool `yaml:"honor_timestamps"`
Scheme string `yaml:"scheme"`
Params map[string][]string `yaml:"params"`
BasicAuth *promauth.BasicAuthConfig `yaml:"basic_auth"`
BearerToken string `yaml:"bearer_token"`
BearerTokenFile string `yaml:"bearer_token_file"`
TLSConfig *promauth.TLSConfig `yaml:"tls_config"`
StaticConfigs []StaticConfig `yaml:"static_configs"`
FileSDConfigs []FileSDConfig `yaml:"file_sd_configs"`
KubernetesSDConfigs []kubernetes.SDConfig `yaml:"kubernetes_sd_configs"`
ConsulSDConfigs []consul.SDConfig `yaml:"consul_sd_configs"`
DNSSDConfigs []dns.SDConfig `yaml:"dns_sd_configs"`
EC2SDConfigs []ec2.SDConfig `yaml:"ec2_sd_configs"`
GCESDConfigs []gce.SDConfig `yaml:"gce_sd_configs"`
RelabelConfigs []promrelabel.RelabelConfig `yaml:"relabel_configs"`
MetricRelabelConfigs []promrelabel.RelabelConfig `yaml:"metric_relabel_configs"`
SampleLimit int `yaml:"sample_limit"`
// This is set in loadConfig
swc *scrapeWorkConfig
}
// FileSDConfig represents file-based service discovery config.
//
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config
type FileSDConfig struct {
Files []string `yaml:"files"`
// `refresh_interval` is ignored. See `-prometheus.fileSDCheckInterval`
}
// StaticConfig represents essential parts for `static_config` section of Prometheus config.
//
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#static_config
type StaticConfig struct {
Targets []string `yaml:"targets"`
Labels map[string]string `yaml:"labels"`
}
func loadStaticConfigs(path string) ([]StaticConfig, error) {
data, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("cannot read `static_configs` from %q: %s", path, err)
}
var stcs []StaticConfig
if err := yaml.UnmarshalStrict(data, &stcs); err != nil {
return nil, fmt.Errorf("cannot unmarshal `static_configs` from %q: %s", path, err)
}
return stcs, nil
}
// loadConfig loads Prometheus config from the given path.
func loadConfig(path string) (cfg *Config, data []byte, err error) {
data, err = ioutil.ReadFile(path)
if err != nil {
return nil, nil, fmt.Errorf("cannot read Prometheus config from %q: %s", path, err)
}
var cfgObj Config
if err := cfgObj.parse(data, path); err != nil {
return nil, nil, fmt.Errorf("cannot parse Prometheus config from %q: %s", path, err)
}
if *dryRun {
// This is a dirty hack for checking Prometheus config only.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/362
// and https://github.com/VictoriaMetrics/VictoriaMetrics/issues/508 for details.
logger.Infof("Success: the config at %q has no errors; exitting with 0 status code", path)
os.Exit(0)
}
return &cfgObj, data, nil
}
func (cfg *Config) parse(data []byte, path string) error {
if err := unmarshalMaybeStrict(data, cfg); err != nil {
return fmt.Errorf("cannot unmarshal data: %s", err)
}
absPath, err := filepath.Abs(path)
if err != nil {
return fmt.Errorf("cannot obtain abs path for %q: %s", path, err)
}
cfg.baseDir = filepath.Dir(absPath)
for i := range cfg.ScrapeConfigs {
sc := &cfg.ScrapeConfigs[i]
swc, err := getScrapeWorkConfig(sc, cfg.baseDir, &cfg.Global)
if err != nil {
return fmt.Errorf("cannot parse `scrape_config` #%d: %s", i+1, err)
}
sc.swc = swc
}
return nil
}
func unmarshalMaybeStrict(data []byte, dst interface{}) error {
var err error
if *strictParse || *dryRun {
err = yaml.UnmarshalStrict(data, dst)
} else {
err = yaml.Unmarshal(data, dst)
}
return err
}
// getKubernetesSDScrapeWork returns `kubernetes_sd_configs` ScrapeWork from cfg.
func (cfg *Config) getKubernetesSDScrapeWork() []ScrapeWork {
var dst []ScrapeWork
for i := range cfg.ScrapeConfigs {
sc := &cfg.ScrapeConfigs[i]
for j := range sc.KubernetesSDConfigs {
sdc := &sc.KubernetesSDConfigs[j]
dst = appendKubernetesScrapeWork(dst, sdc, cfg.baseDir, sc.swc)
}
}
return dst
}
// getConsulSDScrapeWork returns `consul_sd_configs` ScrapeWork from cfg.
func (cfg *Config) getConsulSDScrapeWork() []ScrapeWork {
var dst []ScrapeWork
for i := range cfg.ScrapeConfigs {
sc := &cfg.ScrapeConfigs[i]
for j := range sc.ConsulSDConfigs {
sdc := &sc.ConsulSDConfigs[j]
dst = appendConsulScrapeWork(dst, sdc, cfg.baseDir, sc.swc)
}
}
return dst
}
// getDNSSDScrapeWork returns `dns_sd_configs` ScrapeWork from cfg.
func (cfg *Config) getDNSSDScrapeWork() []ScrapeWork {
var dst []ScrapeWork
for i := range cfg.ScrapeConfigs {
sc := &cfg.ScrapeConfigs[i]
for j := range sc.DNSSDConfigs {
sdc := &sc.DNSSDConfigs[j]
dst = appendDNSScrapeWork(dst, sdc, sc.swc)
}
}
return dst
}
// getEC2SDScrapeWork returns `ec2_sd_configs` ScrapeWork from cfg.
func (cfg *Config) getEC2SDScrapeWork() []ScrapeWork {
var dst []ScrapeWork
for i := range cfg.ScrapeConfigs {
sc := &cfg.ScrapeConfigs[i]
for j := range sc.EC2SDConfigs {
sdc := &sc.EC2SDConfigs[j]
dst = appendEC2ScrapeWork(dst, sdc, sc.swc)
}
}
return dst
}
// getGCESDScrapeWork returns `gce_sd_configs` ScrapeWork from cfg.
func (cfg *Config) getGCESDScrapeWork() []ScrapeWork {
var dst []ScrapeWork
for i := range cfg.ScrapeConfigs {
sc := &cfg.ScrapeConfigs[i]
for j := range sc.GCESDConfigs {
sdc := &sc.GCESDConfigs[j]
dst = appendGCEScrapeWork(dst, sdc, sc.swc)
}
}
return dst
}
// getFileSDScrapeWork returns `file_sd_configs` ScrapeWork from cfg.
func (cfg *Config) getFileSDScrapeWork(swsPrev []ScrapeWork) []ScrapeWork {
// Create a map for the previous scrape work.
swsMapPrev := make(map[string][]ScrapeWork)
for i := range swsPrev {
sw := &swsPrev[i]
filepath := promrelabel.GetLabelValueByName(sw.Labels, "__vm_filepath")
if len(filepath) == 0 {
logger.Panicf("BUG: missing `__vm_filepath` label")
} else {
swsMapPrev[filepath] = append(swsMapPrev[filepath], *sw)
}
}
var dst []ScrapeWork
for i := range cfg.ScrapeConfigs {
sc := &cfg.ScrapeConfigs[i]
for j := range sc.FileSDConfigs {
sdc := &sc.FileSDConfigs[j]
dst = sdc.appendScrapeWork(dst, swsMapPrev, cfg.baseDir, sc.swc)
}
}
return dst
}
// getStaticScrapeWork returns `static_configs` ScrapeWork from from cfg.
func (cfg *Config) getStaticScrapeWork() []ScrapeWork {
var dst []ScrapeWork
for i := range cfg.ScrapeConfigs {
sc := &cfg.ScrapeConfigs[i]
for j := range sc.StaticConfigs {
stc := &sc.StaticConfigs[j]
dst = stc.appendScrapeWork(dst, sc.swc, nil)
}
}
return dst
}
func getScrapeWorkConfig(sc *ScrapeConfig, baseDir string, globalCfg *GlobalConfig) (*scrapeWorkConfig, error) {
jobName := sc.JobName
if jobName == "" {
return nil, fmt.Errorf("missing `job_name` field in `scrape_config`")
}
scrapeInterval := sc.ScrapeInterval
if scrapeInterval <= 0 {
scrapeInterval = globalCfg.ScrapeInterval
if scrapeInterval <= 0 {
scrapeInterval = defaultScrapeInterval
}
}
scrapeTimeout := sc.ScrapeTimeout
if scrapeTimeout <= 0 {
scrapeTimeout = globalCfg.ScrapeTimeout
if scrapeTimeout <= 0 {
scrapeTimeout = defaultScrapeTimeout
}
}
honorLabels := sc.HonorLabels
honorTimestamps := sc.HonorTimestamps
metricsPath := sc.MetricsPath
if metricsPath == "" {
metricsPath = "/metrics"
}
scheme := sc.Scheme
if scheme == "" {
scheme = "http"
}
if scheme != "http" && scheme != "https" {
return nil, fmt.Errorf("unexpected `scheme` for `job_name` %q: %q; supported values: http or https", jobName, scheme)
}
params := sc.Params
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)
}
var relabelConfigs []promrelabel.ParsedRelabelConfig
relabelConfigs, err = promrelabel.ParseRelabelConfigs(relabelConfigs[:0], sc.RelabelConfigs)
if err != nil {
return nil, fmt.Errorf("cannot parse `relabel_configs` for `job_name` %q: %s", jobName, err)
}
var metricRelabelConfigs []promrelabel.ParsedRelabelConfig
metricRelabelConfigs, err = promrelabel.ParseRelabelConfigs(metricRelabelConfigs[:0], sc.MetricRelabelConfigs)
if err != nil {
return nil, fmt.Errorf("cannot parse `metric_relabel_configs` for `job_name` %q: %s", jobName, err)
}
swc := &scrapeWorkConfig{
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,
sampleLimit: sc.SampleLimit,
}
return swc, nil
}
type scrapeWorkConfig struct {
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
sampleLimit int
}
func appendKubernetesScrapeWork(dst []ScrapeWork, sdc *kubernetes.SDConfig, baseDir string, swc *scrapeWorkConfig) []ScrapeWork {
targetLabels, err := kubernetes.GetLabels(sdc, baseDir)
if err != nil {
logger.Errorf("error when discovering kubernetes targets for `job_name` %q: %s; skipping it", swc.jobName, err)
return dst
}
return appendScrapeWorkForTargetLabels(dst, swc, targetLabels, "kubernetes_sd_config")
}
func appendConsulScrapeWork(dst []ScrapeWork, sdc *consul.SDConfig, baseDir string, swc *scrapeWorkConfig) []ScrapeWork {
targetLabels, err := consul.GetLabels(sdc, baseDir)
if err != nil {
logger.Errorf("error when discovering consul targets for `job_name` %q: %s; skipping it", swc.jobName, err)
return dst
}
return appendScrapeWorkForTargetLabels(dst, swc, targetLabels, "consul_sd_config")
}
func appendDNSScrapeWork(dst []ScrapeWork, sdc *dns.SDConfig, swc *scrapeWorkConfig) []ScrapeWork {
targetLabels, err := dns.GetLabels(sdc)
if err != nil {
logger.Errorf("error when discovering dns targets for `job_name` %q: %s; skipping it", swc.jobName, err)
return dst
}
return appendScrapeWorkForTargetLabels(dst, swc, targetLabels, "dns_sd_config")
}
func appendEC2ScrapeWork(dst []ScrapeWork, sdc *ec2.SDConfig, swc *scrapeWorkConfig) []ScrapeWork {
targetLabels, err := ec2.GetLabels(sdc)
if err != nil {
logger.Errorf("error when discovering ec2 targets for `job_name` %q: %s; skipping it", swc.jobName, err)
return dst
}
return appendScrapeWorkForTargetLabels(dst, swc, targetLabels, "ec2_sd_config")
}
func appendGCEScrapeWork(dst []ScrapeWork, sdc *gce.SDConfig, swc *scrapeWorkConfig) []ScrapeWork {
targetLabels, err := gce.GetLabels(sdc)
if err != nil {
logger.Errorf("error when discovering gce targets for `job_name` %q: %s; skippint it", swc.jobName, err)
return dst
}
return appendScrapeWorkForTargetLabels(dst, swc, targetLabels, "gce_sd_config")
}
func appendScrapeWorkForTargetLabels(dst []ScrapeWork, swc *scrapeWorkConfig, targetLabels []map[string]string, sectionName string) []ScrapeWork {
for _, metaLabels := range targetLabels {
target := metaLabels["__address__"]
var err error
dst, err = appendScrapeWork(dst, swc, target, nil, metaLabels)
if err != nil {
logger.Errorf("error when parsing `%s` target %q for `job_name` %q: %s; skipping it", sectionName, target, swc.jobName, err)
continue
}
}
return dst
}
func (sdc *FileSDConfig) appendScrapeWork(dst []ScrapeWork, swsMapPrev map[string][]ScrapeWork, baseDir string, swc *scrapeWorkConfig) []ScrapeWork {
for _, file := range sdc.Files {
pathPattern := getFilepath(baseDir, file)
paths := []string{pathPattern}
if strings.Contains(pathPattern, "*") {
var err error
paths, err = filepath.Glob(pathPattern)
if err != nil {
// 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 {
stcs, err := loadStaticConfigs(path)
if err != nil {
// Do not return this error, since other paths may contain valid scrape configs.
if sws := swsMapPrev[path]; sws != nil {
// Re-use the previous valid scrape work for this path.
logger.Errorf("keeping the previously loaded `static_configs` from %q because of error when re-loading the file: %s", path, err)
dst = append(dst, sws...)
} else {
logger.Errorf("skipping loading `static_configs` from %q because of error: %s", path, err)
}
continue
}
pathShort := path
if strings.HasPrefix(pathShort, baseDir) {
pathShort = path[len(baseDir):]
if len(pathShort) > 0 && pathShort[0] == filepath.Separator {
pathShort = pathShort[1:]
}
}
metaLabels := map[string]string{
"__meta_filepath": pathShort,
"__vm_filepath": path, // This label is needed for internal promscrape logic
}
for i := range stcs {
dst = stcs[i].appendScrapeWork(dst, swc, metaLabels)
}
}
}
return dst
}
func (stc *StaticConfig) appendScrapeWork(dst []ScrapeWork, swc *scrapeWorkConfig, metaLabels map[string]string) []ScrapeWork {
for _, target := range stc.Targets {
if target == "" {
// 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
}
var err error
dst, err = appendScrapeWork(dst, swc, target, stc.Labels, metaLabels)
if err != nil {
// 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
}
}
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)
labels = promrelabel.RemoveMetaLabels(labels[:0], labels)
if len(labels) == 0 {
// Drop target without labels.
return dst, nil
}
// See https://www.robustperception.io/life-of-a-label
schemeRelabeled := promrelabel.GetLabelValueByName(labels, "__scheme__")
if len(schemeRelabeled) == 0 {
schemeRelabeled = "http"
}
addressRelabeled := promrelabel.GetLabelValueByName(labels, "__address__")
if len(addressRelabeled) == 0 {
// Drop target without scrape address.
return dst, nil
}
if strings.Contains(addressRelabeled, "/") {
// Drop target with '/'
return dst, nil
}
addressRelabeled = addMissingPort(schemeRelabeled, addressRelabeled)
metricsPathRelabeled := promrelabel.GetLabelValueByName(labels, "__metrics_path__")
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, addressRelabeled, 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, addressRelabeled, swc.metricsPath, metricsPathRelabeled, swc.jobName, err)
}
// Set missing "instance" label according to https://www.robustperception.io/life-of-a-label
if promrelabel.GetLabelByName(labels, "instance") == nil {
labels = append(labels, prompbmarshal.Label{
Name: "instance",
Value: addressRelabeled,
})
promrelabel.SortLabels(labels)
}
dst = append(dst, ScrapeWork{
ID: atomic.AddUint64(&nextScrapeWorkID, 1),
ScrapeURL: scrapeURL,
ScrapeInterval: swc.scrapeInterval,
ScrapeTimeout: swc.scrapeTimeout,
HonorLabels: swc.honorLabels,
HonorTimestamps: swc.honorTimestamps,
Labels: labels,
AuthConfig: swc.authConfig,
MetricRelabelConfigs: swc.metricRelabelConfigs,
SampleLimit: swc.sampleLimit,
})
return dst, nil
}
// Each ScrapeWork has an ID, which is used for locating it when updating its status.
var nextScrapeWorkID uint64
func getParamsFromLabels(labels []prompbmarshal.Label, paramsOrig map[string][]string) map[string][]string {
// See https://www.robustperception.io/life-of-a-label
m := make(map[string][]string)
for i := range labels {
label := &labels[i]
if !strings.HasPrefix(label.Name, "__param_") {
continue
}
name := label.Name[len("__param_"):]
values := []string{label.Value}
if p := paramsOrig[name]; len(p) > 1 {
values = append(values, p[1:]...)
}
m[name] = values
}
return m
}
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 {
m[k] = v
}
m["job"] = job
m["__address__"] = target
m["__scheme__"] = scheme
m["__metrics_path__"] = metricsPath
for k, args := range params {
if len(args) == 0 {
continue
}
k = "__param_" + k
v := args[0]
m[k] = v
}
for k, v := range extraLabels {
m[k] = v
}
for k, v := range metaLabels {
m[k] = v
}
result := make([]prompbmarshal.Label, 0, len(m))
for k, v := range m {
result = append(result, prompbmarshal.Label{
Name: k,
Value: v,
})
}
return result
}
func getFilepath(baseDir, path string) string {
if filepath.IsAbs(path) {
return path
}
return filepath.Join(baseDir, path)
}
func addMissingPort(scheme, target string) string {
if strings.Contains(target, ":") {
return target
}
if scheme == "https" {
target += ":443"
} else {
target += ":80"
}
return target
}
const (
defaultScrapeInterval = time.Minute
defaultScrapeTimeout = 10 * time.Second
)