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main.go
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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 (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/prometheus/common/version"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/util/cli"
"github.com/prometheus/prometheus/util/promlint"
)
// CheckConfigCmd validates configuration files.
func CheckConfigCmd(t cli.Term, args ...string) int {
if len(args) == 0 {
t.Infof("usage: promtool check-config <files>")
return 2
}
failed := false
for _, arg := range args {
ruleFiles, err := checkConfig(t, arg)
if err != nil {
t.Errorf(" FAILED: %s", err)
failed = true
} else {
t.Infof(" SUCCESS: %d rule files found", len(ruleFiles))
}
t.Infof("")
for _, rf := range ruleFiles {
if n, err := checkRules(t, rf); err != nil {
t.Errorf(" FAILED: %s", err)
failed = true
} else {
t.Infof(" SUCCESS: %d rules found", n)
}
t.Infof("")
}
}
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(t cli.Term, filename string) ([]string, error) {
t.Infof("Checking %s", filename)
if stat, err := os.Stat(filename); err != nil {
return nil, fmt.Errorf("cannot get file info")
} else if stat.IsDir() {
return nil, fmt.Errorf("is a directory")
}
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
}
}
}
return ruleFiles, nil
}
func checkTLSConfig(tlsConfig config.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
}
// CheckRulesCmd validates rule files.
func CheckRulesCmd(t cli.Term, args ...string) int {
if len(args) == 0 {
t.Infof("usage: promtool check-rules <files>")
return 2
}
failed := false
for _, arg := range args {
if n, err := checkRules(t, arg); err != nil {
t.Errorf(" FAILED: %s", err)
failed = true
} else {
t.Infof(" SUCCESS: %d rules found", n)
}
t.Infof("")
}
if failed {
return 1
}
return 0
}
func checkRules(t cli.Term, filename string) (int, error) {
t.Infof("Checking %s", filename)
if stat, err := os.Stat(filename); err != nil {
return 0, fmt.Errorf("cannot get file info")
} else if stat.IsDir() {
return 0, fmt.Errorf("is a directory")
}
content, err := ioutil.ReadFile(filename)
if err != nil {
return 0, err
}
rules, err := promql.ParseStmts(string(content))
if err != nil {
return 0, err
}
return len(rules), nil
}
var checkMetricsUsage = strings.TrimSpace(`
usage: promtool check-metrics
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
`)
// CheckMetricsCmd performs a linting pass on input metrics.
func CheckMetricsCmd(t cli.Term, args ...string) int {
if len(args) != 0 {
t.Infof(checkMetricsUsage)
return 2
}
l := promlint.New(os.Stdin)
problems, err := l.Lint()
if err != nil {
t.Errorf("error while linting: %v", err)
return 1
}
for _, p := range problems {
t.Errorf("%s: %s", p.Metric, p.Text)
}
if len(problems) > 0 {
return 3
}
return 0
}
// VersionCmd prints the binaries version information.
func VersionCmd(t cli.Term, _ ...string) int {
fmt.Fprintln(os.Stdout, version.Print("promtool"))
return 0
}
func main() {
app := cli.NewApp("promtool")
app.Register("check-config", &cli.Command{
Desc: "validate configuration files for correctness",
Run: CheckConfigCmd,
})
app.Register("check-rules", &cli.Command{
Desc: "validate rule files for correctness",
Run: CheckRulesCmd,
})
app.Register("check-metrics", &cli.Command{
Desc: "validate metrics for correctness",
Run: CheckMetricsCmd,
})
app.Register("version", &cli.Command{
Desc: "print the version of this binary",
Run: VersionCmd,
})
t := cli.BasicTerm(os.Stdout, os.Stderr)
os.Exit(app.Run(t, os.Args[1:]...))
}