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check.go
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check.go
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package main
import (
"bytes"
"context"
"crypto/tls"
"fmt"
"net"
"net/http"
"net/url"
"os"
"strings"
"time"
"github.com/spf13/cobra"
"go.uber.org/zap"
)
var (
retryCount int
retryDelay time.Duration
method string
body string
timeout time.Duration
)
var checkCmd = &cobra.Command{
Use: `check`,
Short: "Health check commands",
Long: "Commands for running health checks",
}
var checkUrlCmd = &cobra.Command{
Use: `http [address]`,
Short: "HTTP(S) health check",
Example: ` check http https://httpbin.org/anything --method=POST --retry=2 --delay=2s --timeout=3s --body='{"test"=1}'`,
RunE: runCheck,
}
var checkTcpCmd = &cobra.Command{
Use: `tcp [address]`,
Short: "TCP health check",
Example: ` check tcp httpbin.org:443 --retry=1 --delay=2s --timeout=2s`,
RunE: runCheckTCP,
}
var checkCertCmd = &cobra.Command{
Use: `cert [address]`,
Short: "SSL/TLS certificate validity check",
Example: ` check cert httpbin.org`,
RunE: runCheckCert,
}
func init() {
checkUrlCmd.Flags().StringVar(&method, "method", "GET", "HTTP method")
checkUrlCmd.Flags().StringVar(&body, "body", "", "HTTP POST/PUT content")
checkUrlCmd.Flags().IntVar(&retryCount, "retry", 0, "times to retry the HTTP call")
checkUrlCmd.Flags().DurationVar(&retryDelay, "delay", 1*time.Second, "wait duration between retries")
checkUrlCmd.Flags().DurationVar(&timeout, "timeout", 5*time.Second, "timeout")
checkCmd.AddCommand(checkUrlCmd)
checkTcpCmd.Flags().IntVar(&retryCount, "retry", 0, "times to retry the TCP check")
checkTcpCmd.Flags().DurationVar(&retryDelay, "delay", 1*time.Second, "wait duration between retries")
checkTcpCmd.Flags().DurationVar(&timeout, "timeout", 5*time.Second, "timeout")
checkCmd.AddCommand(checkTcpCmd)
checkCmd.AddCommand(checkCertCmd)
rootCmd.AddCommand(checkCmd)
}
func runCheck(cmd *cobra.Command, args []string) error {
if retryCount < 0 {
return fmt.Errorf("--retry is required")
}
if len(args) < 1 {
return fmt.Errorf("address is required! example: check http https://httpbin.org")
}
address := args[0]
if !strings.HasPrefix(address, "http://") && !strings.HasPrefix(address, "https://") {
address = fmt.Sprintf("http://%s", address)
}
for n := 0; n <= retryCount; n++ {
if n != 1 {
time.Sleep(retryDelay)
}
req, err := http.NewRequest(method, address, bytes.NewBuffer([]byte(body)))
if err != nil {
logger.Info("check failed",
zap.String("address", address),
zap.Error(err))
os.Exit(1)
}
ctx, cancel := context.WithTimeout(req.Context(), timeout)
resp, err := http.DefaultClient.Do(req.WithContext(ctx))
cancel()
if err != nil {
logger.Info("check failed",
zap.String("address", address),
zap.Error(err))
continue
}
if resp.Body != nil {
resp.Body.Close()
}
if resp.StatusCode >= 200 && resp.StatusCode < 400 {
logger.Info("check succeed",
zap.String("address", address),
zap.Int("status code", resp.StatusCode),
zap.String("response size", fmtContentLength(resp.ContentLength)))
os.Exit(0)
} else {
logger.Info("check failed",
zap.String("address", address),
zap.Int("status code", resp.StatusCode))
continue
}
}
os.Exit(1)
return nil
}
func runCheckTCP(cmd *cobra.Command, args []string) error {
if retryCount < 0 {
return fmt.Errorf("--retry is required")
}
if len(args) < 1 {
return fmt.Errorf("address is required! example: check tcp httpbin.org:80")
}
address := args[0]
for n := 0; n <= retryCount; n++ {
if n != 1 {
time.Sleep(retryDelay)
}
conn, err := net.DialTimeout("tcp", address, timeout)
if err != nil {
logger.Info("check failed",
zap.String("address", address),
zap.Error(err))
continue
}
conn.Close()
logger.Info("check succeed", zap.String("address", address))
os.Exit(0)
}
os.Exit(1)
return nil
}
func runCheckCert(cmd *cobra.Command, args []string) error {
if len(args) < 1 {
return fmt.Errorf("address is required! example: check cert httpbin.org")
}
host := args[0]
if !strings.HasPrefix(host, "https://") {
host = "https://" + host
}
u, err := url.Parse(host)
if err != nil {
logger.Info("check failed",
zap.String("address", host),
zap.Error(err))
os.Exit(1)
}
address := u.Hostname() + ":443"
ipConn, err := net.DialTimeout("tcp", address, 5*time.Second)
if err != nil {
logger.Info("check failed",
zap.String("address", address),
zap.Error(err))
os.Exit(1)
}
defer ipConn.Close()
conn := tls.Client(ipConn, &tls.Config{
InsecureSkipVerify: true,
ServerName: u.Hostname(),
})
if err = conn.Handshake(); err != nil {
logger.Info("check failed",
zap.String("address", address),
zap.Error(err))
os.Exit(1)
}
defer conn.Close()
addr := conn.RemoteAddr()
_, _, err = net.SplitHostPort(addr.String())
if err != nil {
logger.Info("check failed",
zap.String("address", address),
zap.Error(err))
os.Exit(1)
}
cert := conn.ConnectionState().PeerCertificates[0]
timeNow := time.Now()
if timeNow.After(cert.NotAfter) {
logger.Info("check failed",
zap.String("address", address),
zap.String("issuer", cert.Issuer.CommonName),
zap.String("subject", cert.Subject.CommonName),
zap.Time("expired", cert.NotAfter))
os.Exit(1)
}
logger.Info("check succeed",
zap.String("address", address),
zap.String("issuer", cert.Issuer.CommonName),
zap.String("subject", cert.Subject.CommonName),
zap.Time("notAfter", cert.NotAfter),
zap.Time("notBefore", cert.NotBefore))
return nil
}
func fmtContentLength(b int64) string {
const unit = 1000
if b < unit {
return fmt.Sprintf("%d B", b)
}
div, exp := int64(unit), 0
for n := b / unit; n >= unit; n /= unit {
div *= unit
exp++
}
return fmt.Sprintf("%.1f %cB", float64(b)/float64(div), "kMGTPE"[exp])
}