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main.go
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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"fmt"
"io/ioutil"
"math"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"gopkg.in/alecthomas/kingpin.v2"
"gopkg.in/yaml.v2"
"github.com/prometheus/client_golang/api"
"github.com/prometheus/client_golang/api/prometheus/v1"
config_util "github.com/prometheus/common/config"
"github.com/prometheus/common/model"
"github.com/prometheus/common/version"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/pkg/rulefmt"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/util/promlint"
)
func main() {
app := kingpin.New(filepath.Base(os.Args[0]), "Tooling for the Prometheus monitoring system.")
app.Version(version.Print("promtool"))
app.HelpFlag.Short('h')
checkCmd := app.Command("check", "Check the resources for validity.")
checkConfigCmd := checkCmd.Command("config", "Check if the config files are valid or not.")
configFiles := checkConfigCmd.Arg(
"config-files",
"The config files to check.",
).Required().ExistingFiles()
checkRulesCmd := checkCmd.Command("rules", "Check if the rule files are valid or not.")
ruleFiles := checkRulesCmd.Arg(
"rule-files",
"The rule files to check.",
).Required().ExistingFiles()
checkMetricsCmd := checkCmd.Command("metrics", checkMetricsUsage)
updateCmd := app.Command("update", "Update the resources to newer formats.")
updateRulesCmd := updateCmd.Command("rules", "Update rules from the 1.x to 2.x format.")
ruleFilesUp := updateRulesCmd.Arg("rule-files", "The rule files to update.").Required().ExistingFiles()
queryCmd := app.Command("query", "Run query against a Prometheus server.")
queryInstantCmd := queryCmd.Command("instant", "Run instant query.")
queryServer := queryInstantCmd.Arg("server", "Prometheus server to query.").Required().URL()
queryExpr := queryInstantCmd.Arg("expr", "PromQL query expression.").Required().String()
queryRangeCmd := queryCmd.Command("range", "Run range query.")
queryRangeServer := queryRangeCmd.Arg("server", "Prometheus server to query.").Required().URL()
queryRangeExpr := queryRangeCmd.Arg("expr", "PromQL query expression.").Required().String()
queryRangeBegin := queryRangeCmd.Flag("start", "Query range start time (RFC3339 or Unix timestamp).").String()
queryRangeEnd := queryRangeCmd.Flag("end", "Query range end time (RFC3339 or Unix timestamp).").String()
switch kingpin.MustParse(app.Parse(os.Args[1:])) {
case checkConfigCmd.FullCommand():
os.Exit(CheckConfig(*configFiles...))
case checkRulesCmd.FullCommand():
os.Exit(CheckRules(*ruleFiles...))
case checkMetricsCmd.FullCommand():
os.Exit(CheckMetrics())
case updateRulesCmd.FullCommand():
os.Exit(UpdateRules(*ruleFilesUp...))
case queryInstantCmd.FullCommand():
os.Exit(QueryInstant(*queryServer, *queryExpr))
case queryRangeCmd.FullCommand():
os.Exit(QueryRange(*queryRangeServer, *queryRangeExpr, *queryRangeBegin, *queryRangeEnd))
}
}
// CheckConfig validates configuration files.
func CheckConfig(files ...string) int {
failed := false
for _, f := range files {
ruleFiles, err := checkConfig(f)
if err != nil {
fmt.Fprintln(os.Stderr, " FAILED:", err)
failed = true
} else {
fmt.Printf(" SUCCESS: %d rule files found\n", len(ruleFiles))
}
fmt.Println()
for _, rf := range ruleFiles {
if n, err := checkRules(rf); err != nil {
fmt.Fprintln(os.Stderr, " FAILED:", err)
failed = true
} else {
fmt.Printf(" SUCCESS: %d rules found\n", n)
}
fmt.Println()
}
}
if failed {
return 1
}
return 0
}
func checkFileExists(fn string) error {
// Nothing set, nothing to error on.
if fn == "" {
return nil
}
_, err := os.Stat(fn)
return err
}
func checkConfig(filename string) ([]string, error) {
fmt.Println("Checking", filename)
cfg, err := config.LoadFile(filename)
if err != nil {
return nil, err
}
var ruleFiles []string
for _, rf := range cfg.RuleFiles {
rfs, err := filepath.Glob(rf)
if err != nil {
return nil, err
}
// If an explicit file was given, error if it is not accessible.
if !strings.Contains(rf, "*") {
if len(rfs) == 0 {
return nil, fmt.Errorf("%q does not point to an existing file", rf)
}
if err := checkFileExists(rfs[0]); err != nil {
return nil, fmt.Errorf("error checking rule file %q: %s", rfs[0], err)
}
}
ruleFiles = append(ruleFiles, rfs...)
}
for _, scfg := range cfg.ScrapeConfigs {
if err := checkFileExists(scfg.HTTPClientConfig.BearerTokenFile); err != nil {
return nil, fmt.Errorf("error checking bearer token file %q: %s", scfg.HTTPClientConfig.BearerTokenFile, err)
}
if err := checkTLSConfig(scfg.HTTPClientConfig.TLSConfig); err != nil {
return nil, err
}
for _, kd := range scfg.ServiceDiscoveryConfig.KubernetesSDConfigs {
if err := checkTLSConfig(kd.TLSConfig); err != nil {
return nil, err
}
}
for _, filesd := range scfg.ServiceDiscoveryConfig.FileSDConfigs {
for _, file := range filesd.Files {
files, err := filepath.Glob(file)
if err != nil {
return nil, err
}
if len(files) != 0 {
// There was at least one match for the glob and we can assume checkFileExists
// for all matches would pass, we can continue the loop.
continue
}
fmt.Printf(" WARNING: file %q for file_sd in scrape job %q does not exist\n", file, scfg.JobName)
}
}
}
return ruleFiles, nil
}
func checkTLSConfig(tlsConfig config_util.TLSConfig) error {
if err := checkFileExists(tlsConfig.CertFile); err != nil {
return fmt.Errorf("error checking client cert file %q: %s", tlsConfig.CertFile, err)
}
if err := checkFileExists(tlsConfig.KeyFile); err != nil {
return fmt.Errorf("error checking client key file %q: %s", tlsConfig.KeyFile, err)
}
if len(tlsConfig.CertFile) > 0 && len(tlsConfig.KeyFile) == 0 {
return fmt.Errorf("client cert file %q specified without client key file", tlsConfig.CertFile)
}
if len(tlsConfig.KeyFile) > 0 && len(tlsConfig.CertFile) == 0 {
return fmt.Errorf("client key file %q specified without client cert file", tlsConfig.KeyFile)
}
return nil
}
// CheckRules validates rule files.
func CheckRules(files ...string) int {
failed := false
for _, f := range files {
if n, errs := checkRules(f); errs != nil {
fmt.Fprintln(os.Stderr, " FAILED:")
for _, e := range errs {
fmt.Fprintln(os.Stderr, e.Error())
}
failed = true
} else {
fmt.Printf(" SUCCESS: %d rules found\n", n)
}
fmt.Println()
}
if failed {
return 1
}
return 0
}
func checkRules(filename string) (int, []error) {
fmt.Println("Checking", filename)
rgs, errs := rulefmt.ParseFile(filename)
if errs != nil {
return 0, errs
}
numRules := 0
for _, rg := range rgs.Groups {
numRules += len(rg.Rules)
}
return numRules, nil
}
// UpdateRules updates the rule files.
func UpdateRules(files ...string) int {
failed := false
for _, f := range files {
if err := updateRules(f); err != nil {
fmt.Fprintln(os.Stderr, " FAILED:", err)
failed = true
}
}
if failed {
return 1
}
return 0
}
func updateRules(filename string) error {
fmt.Println("Updating", filename)
content, err := ioutil.ReadFile(filename)
if err != nil {
return err
}
rules, err := promql.ParseStmts(string(content))
if err != nil {
return err
}
yamlRG := &rulefmt.RuleGroups{
Groups: []rulefmt.RuleGroup{{
Name: filename,
}},
}
yamlRules := make([]rulefmt.Rule, 0, len(rules))
for _, rule := range rules {
switch r := rule.(type) {
case *promql.AlertStmt:
yamlRules = append(yamlRules, rulefmt.Rule{
Alert: r.Name,
Expr: r.Expr.String(),
For: model.Duration(r.Duration),
Labels: r.Labels.Map(),
Annotations: r.Annotations.Map(),
})
case *promql.RecordStmt:
yamlRules = append(yamlRules, rulefmt.Rule{
Record: r.Name,
Expr: r.Expr.String(),
Labels: r.Labels.Map(),
})
default:
panic("unknown statement type")
}
}
yamlRG.Groups[0].Rules = yamlRules
y, err := yaml.Marshal(yamlRG)
if err != nil {
return err
}
return ioutil.WriteFile(filename+".yml", y, 0666)
}
var checkMetricsUsage = strings.TrimSpace(`
Pass Prometheus metrics over stdin to lint them for consistency and correctness.
examples:
$ cat metrics.prom | promtool check metrics
$ curl -s http://localhost:9090/metrics | promtool check metrics
`)
// CheckMetrics performs a linting pass on input metrics.
func CheckMetrics() int {
l := promlint.New(os.Stdin)
problems, err := l.Lint()
if err != nil {
fmt.Fprintln(os.Stderr, "error while linting:", err)
return 1
}
for _, p := range problems {
fmt.Fprintln(os.Stderr, p.Metric, p.Text)
}
if len(problems) > 0 {
return 3
}
return 0
}
// QueryInstant performs an instant query against a Prometheus server.
func QueryInstant(url *url.URL, query string) int {
config := api.Config{
Address: url.String(),
}
// Create new client.
c, err := api.NewClient(config)
if err != nil {
fmt.Fprintln(os.Stderr, "error creating API client:", err)
return 1
}
// Run query against client.
api := v1.NewAPI(c)
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
val, err := api.Query(ctx, query, time.Now())
cancel()
if err != nil {
fmt.Fprintln(os.Stderr, "query error:", err)
return 1
}
fmt.Println(val.String())
return 0
}
// QueryRange performs a range query against a Prometheus server.
func QueryRange(url *url.URL, query string, start string, end string) int {
config := api.Config{
Address: url.String(),
}
// Create new client.
c, err := api.NewClient(config)
if err != nil {
fmt.Fprintln(os.Stderr, "error creating API client:", err)
return 1
}
var stime, etime time.Time
if end == "" {
etime = time.Now()
} else {
etime, err = parseTime(end)
if err != nil {
fmt.Fprintln(os.Stderr, "error parsing end time:", err)
return 1
}
}
if start == "" {
stime = etime.Add(-5 * time.Minute)
} else {
stime, err = parseTime(start)
if err != nil {
fmt.Fprintln(os.Stderr, "error parsing start time:", err)
}
}
if !stime.Before(etime) {
fmt.Fprintln(os.Stderr, "start time is not before end time")
}
resolution := math.Max(math.Floor(etime.Sub(stime).Seconds()/250), 1)
// Convert seconds to nanoseconds such that time.Duration parses correctly.
step := time.Duration(resolution * 1e9)
// Run query against client.
api := v1.NewAPI(c)
r := v1.Range{Start: stime, End: etime, Step: step}
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
val, err := api.QueryRange(ctx, query, r)
cancel()
if err != nil {
fmt.Fprintln(os.Stderr, "query error:", err)
return 1
}
fmt.Println(val.String())
return 0
}
func parseTime(s string) (time.Time, error) {
if t, err := strconv.ParseFloat(s, 64); err == nil {
s, ns := math.Modf(t)
return time.Unix(int64(s), int64(ns*float64(time.Second))), nil
}
if t, err := time.Parse(time.RFC3339Nano, s); err == nil {
return t, nil
}
return time.Time{}, fmt.Errorf("cannot parse %q to a valid timestamp", s)
}