/
execute.go
222 lines (208 loc) · 4.79 KB
/
execute.go
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package happening
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"strconv"
"strings"
"syscall"
"time"
)
var load = LoadTicker{}
func getSuccessCodes(config *Config) []int {
var codes []int
if config.SuccessCode == "" {
return codes
}
for _, code := range strings.Split(config.SuccessCode, ",") {
c, err := strconv.ParseInt(code, 10, 32)
if err != nil {
log.Fatalf("invalid exit code, %v", err)
}
codes = append(codes, int(c))
}
return codes
}
func isSuccess(exitCode int, config *Config) bool {
codes := getSuccessCodes(config)
for _, code := range codes {
if code == exitCode {
return true
}
}
return false
}
func determineHostname(flagHostname string) string {
if flagHostname == "" {
hostname, err := os.Hostname()
if err != nil {
hostname = "unknown"
}
return hostname
}
return flagHostname
}
func determineUser(configUser string) string {
if configUser == "" {
configUser = os.Getenv("LOGNAME")
}
return configUser
}
func setEventFields(config Config, event *Event) {
if config.Started != "" {
started, err := time.Parse(time.RFC3339, config.Started)
if err != nil {
log.Fatalf("invalid time format (should be RFC3339), %v", err)
}
event.Started = started
}
if config.Duration != time.Duration(0) {
event.Duration = config.Duration
if config.Started == "" {
event.Started = event.Started.Add(-event.Duration)
}
}
if config.Output != "" {
event.Output = config.Output
}
}
func Execute(config Config, block func(output io.Writer) bool) *Event {
hostname := determineHostname(config.Hostname)
user := determineUser(config.User)
started := time.Now()
load.Start()
success := true
duration := time.Duration(0)
outputString := ""
pid := os.Getpid()
pi := getProcinfoSelf()
if block != nil {
if config.CollectOutput {
output := new(bytes.Buffer)
success = block(output)
duration = time.Now().Sub(started)
outputString = output.String()
} else {
success = block(NullWriter)
duration = time.Now().Sub(started)
}
}
event := Event{
Id: GenerateUUIDv4(),
Name: config.Name,
Context: config.Context,
Output: outputString,
Started: started,
Duration: duration,
Success: success,
Hostname: hostname,
User: user,
Pid: pid,
Load: load.Compute(),
CpuUsage: pi.CpuUsage,
MemoryUsage: pi.MemoryUsage,
Store: config.StoreReport,
}
setEventFields(config, &event)
return &event
}
func ExecuteCmd(config Config, cmdArgs []string) *Event {
hostname := determineHostname(config.Hostname)
user := determineUser(config.User)
if len(cmdArgs) > 0 {
cmd := exec.Command(cmdArgs[0], cmdArgs[1:]...)
var outputBuffer bytes.Buffer
stat, err := os.Stdin.Stat()
if err != nil {
log.Fatalf("error while stating stdin: %v", err)
}
if (stat.Mode() & os.ModeCharDevice) == 0 {
cmd.Stdin = os.Stdin
}
if config.CollectOutput {
if config.SuppressOutput {
cmd.Stdout = io.Writer(&outputBuffer)
cmd.Stderr = io.Writer(&outputBuffer)
} else {
mwriter := io.MultiWriter(os.Stdout, &outputBuffer)
cmd.Stdout = mwriter
cmd.Stderr = mwriter
}
} else {
if config.SuppressOutput {
cmd.Stdout = ioutil.Discard
cmd.Stderr = ioutil.Discard
} else {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stdout
}
}
var oldDir string
var success bool
var exitCode int
var signal string
var output string
var pi *procinfo
pid := 0
if config.Chdir != "" {
oldDir, err = os.Getwd()
if err == nil {
err = os.Chdir(config.Chdir)
}
}
started := time.Now()
load.Start()
if err == nil {
err = cmd.Start()
}
if err == nil {
pid = cmd.Process.Pid
err = cmd.Wait()
processState := cmd.ProcessState
pi = getProcinfo(processState)
exitCode = processState.ExitCode()
status := processState.Sys().(syscall.WaitStatus)
if status.Signaled() {
signal = status.Signal().String()
}
success = isSuccess(exitCode, &config)
output = outputBuffer.String()
} else {
output = fmt.Sprintf(
"happening: Starting \"%s\" failed with error \"%v\"", cmdArgs[0], err)
log.Println(output)
exitCode = 1
success = false
}
if config.Chdir != "" {
os.Chdir(oldDir)
}
event := Event{
Id: GenerateUUIDv4(),
Name: config.Name,
Context: config.Context,
Command: cmdArgs,
Output: output,
Started: started,
Duration: time.Now().Sub(started),
Success: success,
ExitCode: exitCode,
Signal: signal,
Hostname: hostname,
User: user,
Pid: pid,
Load: load.Compute(),
CpuUsage: pi.CpuUsage,
MemoryUsage: pi.MemoryUsage,
Store: config.StoreReport,
}
setEventFields(config, &event)
return &event
} else {
return Execute(config, nil)
}
}