Merge pull request #619 from fabxc/fabxc/rule_checker

Increase the usability of the rule_checker CLI.
This commit is contained in:
Julius Volz 2015-04-01 16:36:56 +02:00
commit 9f198cc7b5

View file

@ -19,29 +19,82 @@ package main
import (
"flag"
"fmt"
"github.com/golang/glog"
"io"
"os"
"github.com/prometheus/prometheus/rules"
)
var ruleFile = flag.String("rule-file", "", "The path to the rule file to check.")
var (
flagset = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
ruleFile = flagset.String("rule-file", "", "The path to the rule file to check. (Deprecated)")
)
// checkRules reads rules from in. Sucessfully read rules
// are printed to out.
func checkRules(filename string, in io.Reader, out io.Writer) error {
rules, err := rules.LoadRulesFromReader(in)
if err != nil {
return err
}
fmt.Fprintf(os.Stderr, "%s: successfully loaded %d rules:\n", filename, len(rules))
for _, rule := range rules {
fmt.Fprint(out, rule.String())
fmt.Fprint(out, "\n")
}
return nil
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: rule_checker [path ...]\n")
flagset.PrintDefaults()
os.Exit(2)
}
func main() {
flag.Parse()
flagset.Usage = usage
flagset.Parse(os.Args[1:])
if *ruleFile == "" {
glog.Fatal("Must provide a rule file path")
if flagset.NArg() == 0 && *ruleFile == "" {
if err := checkRules("<stdin>", os.Stdin, os.Stdout); err != nil {
fmt.Fprintf(os.Stderr, "error checking standard input: %s\n", err)
os.Exit(1)
}
os.Exit(0)
}
rules, err := rules.LoadRulesFromFile(*ruleFile)
paths := flagset.Args()
if *ruleFile != "" {
paths = []string{*ruleFile}
fmt.Fprint(os.Stderr, "warning: usage of -rule-file is deprecated.\n")
}
failed := false
for _, path := range paths {
switch dir, err := os.Stat(path); {
case err != nil:
fmt.Fprintf(os.Stderr, "%s: error checking path: %s\n", path, err)
os.Exit(2)
case dir.IsDir():
fmt.Fprintf(os.Stderr, "%s: error checking path: directories not allowed\n", path)
os.Exit(2)
default:
f, err := os.Open(path)
if err != nil {
glog.Fatalf("Error loading rule file %s: %s", *ruleFile, err)
fmt.Fprintf(os.Stderr, "%s: error opening file: %s\n", path, err)
failed = true
} else if err := checkRules(path, f, os.Stdout); err != nil {
fmt.Fprintf(os.Stderr, "%s: error checking rules: %s\n", path, err)
failed = true
}
f.Close()
}
}
fmt.Printf("Successfully loaded %d rules:\n\n", len(rules))
for _, rule := range rules {
fmt.Println(rule)
if failed {
os.Exit(1)
}
}