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goreman.go
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goreman.go
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package main
import (
"errors"
"flag"
"fmt"
"io/ioutil"
"os"
"os/exec"
"regexp"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"github.com/joho/godotenv"
"gopkg.in/yaml.v2"
)
const version = "0.0.10"
func usage() {
fmt.Fprint(os.Stderr, `Tasks:
goreman check # Show entries in Procfile
goreman help [TASK] # Show this help
goreman export [FORMAT] [LOCATION] # Export the apps to another process
(upstart)
goreman run COMMAND [PROCESS...] # Run a command
start
stop
stop-all
restart
restart-all
list
status
goreman start [PROCESS] # Start the application
goreman version # Display Goreman version
Options:
`)
flag.PrintDefaults()
os.Exit(0)
}
// -- process information structure.
type procInfo struct {
proc string
cmdline string
quit bool
cmd *exec.Cmd
port uint
mu sync.Mutex
cond *sync.Cond
waitErr error
}
// process informations named with proc.
var procs map[string]*procInfo
// filename of Procfile.
var procfile = flag.String("f", "Procfile", "proc file")
// rpc port number.
var port = flag.Uint("p", defaultPort(), "port")
// base directory
var basedir = flag.String("basedir", "", "base directory")
// base of port numbers for app
var baseport = flag.Uint("b", 5000, "base number of port")
var maxProcNameLength = 0
type config struct {
Procfile string `yaml:"procfile"`
Port uint `yaml:"port"`
BaseDir string `yaml:"basedir"`
BasePort uint `yaml:"baseport"`
Args []string
}
func readConfig() *config {
var cfg config
flag.Parse()
if flag.NArg() == 0 {
usage()
}
cfg.Procfile = *procfile
cfg.Port = *port
cfg.BaseDir = *basedir
cfg.BasePort = *baseport
cfg.Args = flag.Args()
b, err := ioutil.ReadFile(".goreman")
if err == nil {
yaml.Unmarshal(b, &cfg)
}
return &cfg
}
// read Procfile and parse it.
func readProcfile(cfg *config) error {
procs = map[string]*procInfo{}
content, err := ioutil.ReadFile(cfg.Procfile)
if err != nil {
return err
}
re := regexp.MustCompile(`\$([a-zA-Z]+[a-zA-Z0-9_]+)`)
for _, line := range strings.Split(string(content), "\n") {
tokens := strings.SplitN(line, ":", 2)
if len(tokens) != 2 || tokens[0][0] == '#' {
continue
}
k, v := strings.TrimSpace(tokens[0]), strings.TrimSpace(tokens[1])
if runtime.GOOS == "windows" {
v = re.ReplaceAllStringFunc(v, func(s string) string {
return "%" + s[1:] + "%"
})
}
p := &procInfo{proc: k, cmdline: v, port: cfg.BasePort}
p.cond = sync.NewCond(&p.mu)
procs[k] = p
cfg.BasePort++
if len(k) > maxProcNameLength {
maxProcNameLength = len(k)
}
}
if len(procs) == 0 {
return errors.New("no valid entry")
}
return nil
}
func defaultServer(serverPort uint) string {
s := os.Getenv("GOREMAN_RPC_SERVER")
if s != "" {
return s
}
return fmt.Sprintf("127.0.0.1:%d", defaultServer(serverPort))
}
func defaultAddr() string {
s := os.Getenv("GOREMAN_RPC_ADDR")
if s != "" {
return s
}
return "0.0.0.0"
}
// default port
func defaultPort() uint {
s := os.Getenv("GOREMAN_RPC_PORT")
if s != "" {
i, err := strconv.Atoi(s)
if err == nil {
return uint(i)
}
}
return 8555
}
// command: check. show Procfile entries.
func check(cfg *config) error {
err := readProcfile(cfg)
if err != nil {
return err
}
keys := make([]string, len(procs))
i := 0
for k := range procs {
keys[i] = k
i++
}
sort.Strings(keys)
fmt.Printf("valid procfile detected (%s)\n", strings.Join(keys, ", "))
return nil
}
// command: start. spawn procs.
func start(cfg *config) error {
err := readProcfile(cfg)
if err != nil {
return err
}
if len(cfg.Args) > 1 {
tmp := map[string]*procInfo{}
for _, v := range cfg.Args[1:] {
p, ok := procs[v]
if !ok {
return errors.New("unknown proc: " + v)
}
tmp[v] = p
}
procs = tmp
}
godotenv.Load()
go startServer(cfg.Port)
return startProcs()
}
func main() {
var err error
cfg := readConfig()
if cfg.BaseDir != "" {
err = os.Chdir(cfg.BaseDir)
if err != nil {
fmt.Fprintf(os.Stderr, "goreman: %s\n", err.Error())
os.Exit(1)
}
}
cmd := cfg.Args[0]
switch cmd {
case "check":
err = check(cfg)
break
case "help":
usage()
break
case "run":
if len(cfg.Args) >= 2 {
cmd, args := cfg.Args[1], cfg.Args[2:]
err = run(cmd, args, cfg.Port)
} else {
usage()
}
break
case "export":
if len(cfg.Args) == 3 {
format, path := cfg.Args[1], cfg.Args[2]
err = export(cfg, format, path)
} else {
usage()
}
break
case "start":
err = start(cfg)
break
case "version":
fmt.Println(version)
break
default:
usage()
}
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", os.Args[0], err.Error())
os.Exit(1)
}
}