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main.go
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main.go
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package main
import (
"bytes"
"fmt"
"io/ioutil"
"net/http"
"os"
"os/exec"
"strings"
"time"
"github.com/ggiamarchi/http-check/logger"
"github.com/gin-gonic/gin"
cli "github.com/jawher/mow.cli"
yaml "gopkg.in/yaml.v2"
)
type check struct {
Name string `json:"name" yaml:"name"`
Command command `json:"command" yaml:"command"`
Status status `json:"status" yaml:"status"`
}
func (c *check) String() string {
return fmt.Sprintf("%+v", *c)
}
type command struct {
Executable string `json:"executable" yaml:"executable"`
Args []interface{} `json:"args" yaml:"args"`
}
func (c *command) String() string {
return fmt.Sprintf("%+v", *c)
}
type status struct {
Failure int `json:"failure" yaml:"failure"`
Success int `json:"success" yaml:"success"`
}
func (s *status) String() string {
return fmt.Sprintf("%+v", *s)
}
type appConfig struct {
Checks []check
Server struct {
Port int
}
}
func (c *appConfig) String() string {
return fmt.Sprintf("%+v", *c)
}
func main() {
app := cli.App("http-check", "HTTP Check exposes system commands as a single HTTP endpoint")
app.Command("server", "Run HTTP Check server", func(cmd *cli.Cmd) {
var configFile = cmd.StringOpt("c config", "/etc/http-check/http-check.yml", "HTTP Check YAML configuration file")
cmd.Action = func() {
logger.Init(false)
logger.Info("Starting HTTP Check server...")
appConfig := loadAppConfig(*configFile)
s := &http.Server{
Addr: fmt.Sprintf(":%d", appConfig.Server.Port),
Handler: api(appConfig),
ReadTimeout: 30 * time.Second,
WriteTimeout: 30 * time.Second,
}
s.ListenAndServe()
}
})
app.Run(os.Args)
}
func api(appConfig *appConfig) *gin.Engine {
api := gin.New()
api.Use(logger.APILogger(), gin.Recovery())
v1 := api.Group("/v1")
checks := make(map[string]check)
for _, check := range appConfig.Checks {
checks[check.Name] = check
}
v1.GET("/check/:name", func(c *gin.Context) {
check := checks[c.Param("name")]
stdout, stderr, err := execCommand(check.Command.Executable, check.Command.Args...)
responseCode := check.Status.Success
errorMsg := ""
if err != nil {
logger.Info("error :: %s", err)
responseCode = check.Status.Failure
errorMsg = err.Error()
}
c.JSON(responseCode, gin.H{
"stdout": stdout,
"stderr": stderr,
"error": errorMsg,
})
})
return api
}
func loadAppConfig(file string) *appConfig {
data, err := ioutil.ReadFile(file)
if err != nil {
panic(err)
}
c := appConfig{}
err = yaml.Unmarshal([]byte(data), &c)
if err != nil {
panic(err)
}
return &c
}
func execCommand(command string, args ...interface{}) (string, string, error) {
fmtCommand := fmt.Sprintf(command, args...)
splitCommand := strings.Split(fmtCommand, " ")
logger.Info("Executing command :: %s :: with args :: %v => %s", command, args, fmtCommand)
cmdName := splitCommand[0]
cmdArgs := splitCommand[1:len(splitCommand)]
cmd := exec.Command(cmdName, cmdArgs...)
var stdout bytes.Buffer
cmd.Stdout = &stdout
var stderr bytes.Buffer
cmd.Stderr = &stderr
err := cmd.Run()
return stdout.String(), stderr.String(), err
}