done

.gitignore

 .idea
 *.exe
-*~
\ No newline at end of file
+*~
+log
\ No newline at end of file

README.md

 ## dbackup
-database backup service
+备份数据库服务
+
+## 配置
+
+配置使用TOML格式，示例如下:
+```toml
+[[PGConfig]]
+host = "127.0.0.1"
+port = 5432
+db = ["test", "postgres"]
+username = "abby"
+password = "abby"
+destination = "D:/backup"
+keep = 3
+cron = "0 */1 * * * *" # 每分钟的第0秒运行
+options = ["-Fc", "--no-owner"]
+
+[[PGConfig]]
+host = "127.0.0.1"
+port = 5433
+db = ["db1", "db2"]
+username = "admin"
+password = "admin"
+destination = "/data/backup"
+keep = 10
+cron = "0 0 1 * * *" # 每天1点0分0秒运行
+options = ["--inserts"]
+```
+
+配置中`keep`表示保留最近 N 天， `cron`表示何时执行备份任务，6个`*` 分别表示： 秒, 分, 时, 本月第几天，月，本月第几天，举例如下：
+
+
+- `33 1 * * * *` 每个小时的 1 分 33 秒执行  
+- `*/1 * * * * *` 每秒执行  
+- `0 */1 * * * * ` 每分钟执行  
+- `23 30 1 * * *`  每天 1 时 30 分 23 秒执行  
+
+更多参考 [这里](https://godoc.org/github.com/robfig/cron)  
+
+## 用法  
+1, Windows/Linux下直接运行  
+2, Linux下可选择安装为服务 `./dbackup -service install` (以root用户运行)  
+  可用参数有 `-service start`, `-service stop`, `-service restart`, `-service install`, `-service uninstall`  
+  
+程序会读取程序所在目录下的`conf.toml`配置，并在当前目录下创建`log`目录用于记录日志  
+
+## 注意
+1，必须保证`pg_dump` 在环境变量中  
+2, 程序只会使用必要的参数用于连接数据库，额外的参数可以通过`options`传递  
+3, 输出备份文件名为 `db_yyyymmdd-HHMMSS.dump` 且不可配置，存放位置为 `destination/db/db_yyyymmdd-HHMMSS.dump`      
+3, windows中程序不能作为服务运行(因为pg_dump找不到pgpass)   
+
+## 示例  
+
+每分钟备份一次，保留最近3分钟的备份  
+
+[example](./example.png)
\ No newline at end of file

conf.toml

-[[postgresql]]
+[[PGConfig]]
 host = "127.0.0.1"
 port = 5432
-db = ["db1", "db2"]
-username = "postgres"
-password = "postgres"
-destination = "/data/archive"
+db = ["test", "postgres"]
+username = "abby"
+password = "abby"
+destination = "D:/backup"
 keep = 10
-# M H d m w
-cron = "10 2 * * *"
-options = ["-Fc", "--no-onwer"]
+cron = "0 30 1 * * *" # run every day at 01:30:00
+options = ["-Fc", "--no-owner"]
 
-[[postgresql]]
-host = "127.0.0.1"
-port = 5433
-db = ["db1", "db2"]
-username = "admin"
-password = "admin"
-destination = "/data/backup"
-keep = 10
-cron = "0 1 * * *"
-options = ["--inserts"]
\ No newline at end of file
+#[[PGConfig]]
+#host = "127.0.0.1"
+#port = 5433
+#db = ["db1", "db2"]
+#username = "admin"
+#password = "admin"
+#destination = "/data/backup"
+#keep = 10
+#cron = "0 0 1 * * *" # run every day at 01:00:00
+#options = ["--inserts"]
\ No newline at end of file

detail/common.go

@@ -5,16 +5,32 @@ import (
 	"github.com/kardianos/service"
 	"github.com/robfig/cron"
 	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
 	"time"
 )
 
 func InitLogger() {
-	_ = log.Init(&log.Logger{
-		FileName: os.TempDir() + "/dbackup.log",
+	curr, e := filepath.Abs(filepath.Dir(os.Args[0]))
+	if e != nil {
+		curr = filepath.Join(os.TempDir(), "dbackup.log")
+	} else {
+		curr = filepath.Join(curr, "log")
+		_ = os.MkdirAll(curr, os.ModePerm)
+		curr = filepath.Join(curr, "dbackup.log")
+	}
+
+	if runtime.GOOS == "windows" {
+		curr = strings.ReplaceAll(curr, "\\", "/")
+	}
+
+	e = log.Init(&log.Logger{
+		FileName: curr,
 		RollSize: 1 << 30,
 		RollInterval: time.Hour * 30,
 		Level: log.DEBUG,
-		PanicOnFatal: false,
+		PanicOnFatal: true,
 	})
 }
 
@@ -29,11 +45,13 @@ type Task struct {
 }
 
 func (t *Task) Start(srv service.Service) error {
+	log.Info("starting...")
+	go t.Run()
 	return nil
 }
 
 func (t* Task) Run() {
-
+	log.Info("running...")
 	t.Cron.Start()
 	<- t.Ch
 	log.Info("stopped")
@@ -43,6 +61,7 @@ func (t* Task) Run() {
 
 func (t *Task) Stop(srv service.Service) error {
 	log.Info("stopping...")
+	t.Cron.Stop()
 	t.Ch <- struct{}{}
 	return nil
 }

detail/postgresql.go

 package detail
 
 import (
+	"bufio"
 	log "dbackup/logging"
 	"fmt"
 	"github.com/robfig/cron"
+	"io"
+	"io/ioutil"
+	"os"
 	"os/exec"
+	user2 "os/user"
+	"path/filepath"
+	"runtime"
+	"strconv"
 	"strings"
 	"time"
 )
@@ -14,22 +22,111 @@ const (
 )
 
 type PGConfig struct {
-	Host string
-	Port string
-	DB string
-	Username string
-	Password string
-	Destination string
-	Keep int
-	Cron string
-	Options []string
+	Host        string   `toml:"host"`
+	Port        int      `toml:"port"`
+	DB          []string `toml:"db"`
+	Username    string   `toml:"username"`
+	Password    string   `toml:"password"`
+	Destination string   `toml:"destination"`
+	Keep        int64      `toml:"keep"`
+	Cron        string   `toml:"cron"`
+	Options     []string `toml:"options"`
 }
 
 type Postgres struct {
 	PGConfig []PGConfig
 }
 
+func (x *Postgres) Setup() {
+	for _, c := range x.PGConfig {
+		if strings.Index(c.Destination, "\\") != -1 {
+			log.Fatal("invalid destination: %s, must use Unix Path Seperator `/`")
+		}
+		for _, i := range c.DB {
+			if e := os.MkdirAll(c.Destination + "/" + i, os.ModePerm); e != nil {
+				log.Fatal("can't mkdir: %s, err: %s", c.Destination, e)
+			}
+		}
+	}
+
+	user, e := user2.Current()
+
+	if e != nil {
+		log.Fatal("can't get current user: %s", e)
+	}
+
+	var pgpass string
+
+	if runtime.GOOS == "windows" {
+		pgpass = filepath.Join(os.Getenv("AppData"), "postgresql")
+		_ = os.MkdirAll(pgpass, os.ModePerm)
+		pgpass = filepath.Join(pgpass, "pgpass.conf")
+
+	} else if runtime.GOOS == "linux" {
+
+		pgpass = filepath.Join(user.HomeDir, ".pgpass")
+
+	} else {
+		log.Fatal("un-support os")
+	}
+
+	f, e := os.OpenFile(pgpass, os.O_RDWR, 0)
+	if e != nil {
+		f, e = os.Create(pgpass)
+		if e != nil {
+			log.Fatal("can't create %s, err: %s", f, e)
+		}
+
+		if runtime.GOOS == "linux" {
+			_ = os.Chmod(pgpass, 0600)
+		}
+	}
+
+	set := make(map[string]bool)
+
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		ff := scanner.Text()
+		log.Info("==>> %s", ff)
+		set[ff] = true
+	}
+
+	if err := scanner.Err(); err != nil {
+		f.Close()
+		log.Fatal("can't read pgpass: %s", err)
+	}
+
+	for _, cfg := range x.PGConfig {
+		for _, db := range cfg.DB {
+			line := fmt.Sprintf("%s:%d:%s:%s:%s", cfg.Host, cfg.Port, db, cfg.Username, cfg.Password)
+			set[line] = true
+		}
+	}
+
+	e = f.Truncate(0)
+	f.Seek(0, io.SeekStart)
+	for k, _ := range set {
+		_, _ = fmt.Fprintf(f, "%s\n", k)
+	}
+
+	f.Close()
+
+	// NOTE: don't work when run as service
+	// hard code, fuck windows
+	// assume that %APPDATA% is C:\Users\Administrator\AppData\Roaming
+	//if runtime.GOOS == "windows" {
+	//	r := "C:/Users/Administrator/AppData/Roaming/postgresql"
+	//	_ = os.MkdirAll(r, os.ModePerm)
+	//	e = os.Rename(pgpass, r + "/pgpass.conf")
+	//	if e != nil {
+	//		log.Fatal("can't rename: %s", e)
+	//	}
+	//}
+}
+
 func (x *Postgres) AddTask(t *Task) error {
+	x.Setup()
+	log.Info("postgres adding task, count: %d", len(x.PGConfig))
 	for _, cfg := range x.PGConfig {
 		if e := cfg.AddCron(t.Cron); e != nil {
 			return e
@@ -39,13 +136,42 @@ func (x *Postgres) AddTask(t *Task) error {
 }
 
 func (x *PGConfig) Run() {
-	path := fmt.Sprintf(`%s/%v_%v.dump`, x.Destination, x.DB, time.Now().Unix())
-	options := append(x.GetOptions(), "-Fc", fmt.Sprintf(`-f%v`, path))
-	out, err := exec.Command(PGDumpCmd, options...).Output()
-	if err != nil {
-		log.Fatal("%s", out)
-	} else {
-		log.Info("%s %s, ok", PGDumpCmd, strings.Join(options, " "))
+	log.Info("backup postgresql...")
+	for _, db := range x.DB {
+		path := fmt.Sprintf(`%s/%s/%v_%v.dump`, x.Destination, db, db, time.Now().Format("20060102-150405"))
+		options := append(x.GetOptions(db), "-f", path) //fmt.Sprintf(`-f%v`, path))
+		cmd := fmt.Sprintf("%s %s", PGDumpCmd, strings.Join(options, " "))
+		log.Info("running task: `%s`", cmd)
+		out, err := exec.Command(PGDumpCmd, options...).CombinedOutput()
+		if err != nil {
+			log.Fatal("failed: %s, %s", err, out)
+		} else {
+			log.Info("ok")
+			x.CleanUp(db)
+		}
+	}
+}
+
+func (x *PGConfig) CleanUp(db string) {
+	root := fmt.Sprintf("%s/%s", x.Destination, db)
+	info, e := ioutil.ReadDir(root)
+	if e != nil {
+		log.Fatal("can't list dir: %s, err: %s", x.Destination, e)
+	}
+
+	for _, i := range info {
+		if strings.Index(i.Name(), db) == 0 {
+			f := fmt.Sprintf("%s/%s", root, i.Name())
+			o, e := os.Stat(f)
+			if e != nil {
+				log.Error("can't get last modify time for: %s, err: %s", f, e)
+				continue
+			}
+			if time.Since(o.ModTime()) >= time.Duration(x.Keep * int64(time.Hour)) {
+				log.Info("remove expired backup: %s", i.Name())
+				_ = os.Remove(f)
+			}
+		}
 	}
 }
 
@@ -59,30 +185,17 @@ func (x *PGConfig) AddCron(c *cron.Cron) error {
 		}
 	}
 	s = s[0:i]
-	if len(s) != 5 {
+	log.Info("%s", s)
+	if len(s) != 6 {
 		return fmt.Errorf("invalid cron format: %s", x.Cron)
 	}
 	return c.AddJob(strings.Join(s, " "), x)
 }
 
-func (x *PGConfig) GetOptions() []string {
+func (x *PGConfig) GetOptions(db string) []string {
 	options := x.Options
 
-	if x.DB != "" {
-		options = append(options, fmt.Sprintf(`-d%v`, x.DB))
-	}
-
-	if x.Host != "" {
-		options = append(options, fmt.Sprintf(`-h%v`, x.Host))
-	}
-
-	if x.Port != "" {
-		options = append(options, fmt.Sprintf(`-p%v`, x.Port))
-	}
-
-	if x.Username != "" {
-		options = append(options, fmt.Sprintf(`-U%v`, x.Username))
-	}
+	options = append(options, "-d", db, "-h", x.Host, "-p", strconv.Itoa(x.Port), "-U", x.Username)
 
 	return options
 }
\ No newline at end of file

go.mod

@@ -3,7 +3,7 @@ module dbackup
 go 1.12
 
 require (
-	github.com/BurntSushi/toml v0.3.1 // indirect
+	github.com/BurntSushi/toml v0.3.1
 	github.com/kardianos/service v1.0.0
 	github.com/robfig/cron v1.2.0
 )

logging/logging.go

@@ -151,6 +151,7 @@ func Error(f string, args ...interface{}) {
 
 func Fatal(f string, args ...interface{}) {
 	backend.dispatch(FATAL, f, args...)
+	Release()
 	if backend.PanicOnFatal {
 		panic("fatal error")
 	}

main.go

-// +build windows
-
 package main
 
 import (
 	"dbackup/detail"
+	log "dbackup/logging"
 	"flag"
-	"fmt"
+	"github.com/BurntSushi/toml"
 	"github.com/kardianos/service"
 	"github.com/robfig/cron"
-	"log"
 	"os"
-	"path"
-	"runtime"
+	"path/filepath"
 )
 
 func main() {
 	svcFlag := flag.String("service", "", "Control the system service.")
 	flag.Parse()
+	detail.InitLogger()
 
 	p := &detail.Task{
 		Ch: make(chan struct{}),
@@ -25,8 +23,6 @@ func main() {
 
 	addTask(p)
 
-	detail.InitLogger()
-
 	s, e := service.New(p, &service.Config{
 		Name:        "test",
 		DisplayName: "test service",
@@ -34,20 +30,20 @@ func main() {
 	})
 
 	if e != nil {
-		log.Fatal(e)
+		log.Fatal("%s", e)
 	}
 
 	errs := make(chan error, 5)
 	lgg, e := s.Logger(errs)
 	if e != nil {
-		log.Fatal(e)
+		log.Fatal("%s", e)
 	}
 
 	go func() {
 		for {
 			err := <-errs
 			if err != nil {
-				log.Print(err)
+				log.Fatal("%s", err)
 			}
 		}
 	}()
@@ -55,8 +51,8 @@ func main() {
 	if len(*svcFlag) != 0 {
 		err := service.Control(s, *svcFlag)
 		if err != nil {
-			log.Printf("Valid actions: %q\n", service.ControlAction)
-			log.Fatal(err)
+			log.Fatal("Valid actions: %q\n", service.ControlAction)
+			log.Fatal("%s", err)
 		}
 		return
 	}
@@ -69,19 +65,19 @@ func main() {
 }
 
 func addTask(t *detail.Task) {
-	bindir := []byte(path.Dir(os.Args[0]))
-	if runtime.GOOS == "windows" {
-		i := 0
-		for j := 0; j < len(bindir); j++ {
-			if bindir[j] != '\\' {
-				bindir[i] = bindir[j]
-				i += 1
-			}
-		}
-		bindir = bindir[0:i]
+	tmp, err := filepath.Abs(filepath.Dir(os.Args[0]))
+	if err != nil {
+		log.Fatal("can't get current work directory: %s", err)
 	}
 
-	cfg := fmt.Sprintf("%s/conf.toml", string(bindir))
+	cfg := filepath.Join(tmp, "conf.toml")
 
+	var pg detail.Postgres
+	if _, err := toml.DecodeFile(cfg, &pg); err != nil {
+		log.Fatal("%s", err)
+	}
 
+	if err := pg.AddTask(t); err != nil {
+		log.Fatal("%s", err)
+	}
 }
\ No newline at end of file