add email notifications on failure

Dockerfile

@@ -0,0 +1,13 @@
+FROM frolvlad/alpine-glibc:alpine-3.9_glibc-2.29
+RUN apk update && apk add --no-cache ca-certificates
+
+RUN mkdir -p /var/log
+WORKDIR /main
+
+COPY . .
+
+ENV GOPATH=""
+ENV MNT="/mnt/"
+ENTRYPOINT ["/main/exec-youtuber"]
+CMD []
+

config/config.go

@@ -1,20 +1,46 @@
 package config
 
-var (
-	Feed = "https://www.youtube.com/feeds/videos.xml?channel_id=UCwX0AEx-qIhQ9kgtlNhyIXw"
-	Root = "/tmp"
+import (
+	"local/args"
+	"local/sandbox/contact/contact"
+	"os"
 )
 
-/*
-config = {
-   "path"      :  "../TV/Shepherds_Chapel"   ,
-   "rss"       :  "https://www.youtube.com/feeds/videos.xml?channel_id=UCwX0AEx-qIhQ9kgtlNhyIXw"   ,
-   "last"      :  0  ,
-   "lasttime"  : datetime.datetime(1999,1,1) ,
-   "onlynew"   :  False ,
-   "delay"     :  12 ,
-   "clear"     :  False ,
-   "logloc"    :  "./log"  ,
-   "idle"      :  False ,
+var (
+	Feed    string
+	Root    string
+	To      string
+	Subject string
+	Emailer *contact.Emailer
+)
+
+func init() {
+	os.Setenv("LC_ALL", "C.UTF-8")
+
+	as := args.NewArgSet()
+
+	as.Append(args.STRING, "to", "message recipient", "squeaky2x3@gmail.com")
+	as.Append(args.STRING, "subject", "message subject", "youtuber error")
+	as.Append(args.STRING, "from", "message sender", "breellocaldev@gmail.com")
+	as.Append(args.STRING, "password", "message sender password", "ML3WQRFSqe9rQ8qNkm")
+	as.Append(args.STRING, "smtp", "smtp server:port", "smtp.gmail.com:465")
+	as.Append(args.STRING, "pop3", "pop3 server:port", "pop.gmail.com:995")
+
+	as.Append(args.STRING, "feed", "feed URL", "https://www.youtube.com/feeds/videos.xml?channel_id=UCwX0AEx-qIhQ9kgtlNhyIXw")
+	as.Append(args.STRING, "root", "root to save videos", "/tmp")
+
+	if err := as.Parse(); err != nil {
+		panic(err)
+	}
+
+	Feed = as.Get("feed").GetString()
+	Root = as.Get("root").GetString()
+	To = as.Get("to").GetString()
+	Subject = as.Get("subject").GetString()
+	Emailer = &contact.Emailer{
+		From:     as.Get("from").GetString(),
+		SMTP:     as.Get("smtp").GetString(),
+		POP3:     as.Get("pop3").GetString(),
+		Password: as.Get("password").GetString(),
+	}
 }
-*/

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"local/youtuber/config"
 	"local/youtuber/feed"
@@ -9,19 +10,38 @@ import (
 	"os"
 	"path"
 	"strings"
+	"time"
 )
 
 func main() {
-	os.Setenv("LC_ALL", "C.UTF-8")
-	results, err := feed.Fetch(config.Feed)
+	client, err := youtubedl.New()
 	if err != nil {
 		panic(err)
 	}
-	log.Println(results)
+	interval := time.Hour * 4
+	for true {
+		err := do(client)
+		if err != nil {
+			log.Println(err)
+			if err := config.Emailer.Send(
+				config.To,
+				config.Subject,
+				fmt.Sprintf("error getting youtuber: %v", err),
+			); err != nil {
+				panic(err)
+			}
+		}
+		log.Printf("sleeping until %v", time.Now().Add(interval))
+		time.Sleep(interval)
+	}
+}
 
-	youtubedl, err := youtubedl.New()
+func do(client *youtubedl.Client) error {
+	errs := ""
+
+	results, err := feed.Fetch(config.Feed)
 	if err != nil {
-		panic(err)
+		return err
 	}
 
 	for _, result := range results {
@@ -32,10 +52,17 @@ func main() {
 			result.Date.Day(),
 			strings.Join(strings.Split(result.Title, " ")[2:], "_"),
 		)
-		if err := youtubedl.Download(result.Link, path.Join(config.Root, target)); err != nil {
-			panic(err)
+		target = path.Join(config.Root, target)
+		if _, err := os.Stat(strings.ReplaceAll(target, "%(ext)s", "mp4")); !os.IsNotExist(err) {
+			log.Printf("already exists: %s", target)
+			continue
+		}
+		if err := client.Download(result.Link, path.Join(config.Root, target)); err != nil {
+			errs += ", " + err.Error()
 		}
-		return
 	}
-	log.Println(youtubedl)
+	if errs != "" {
+		return errors.New(errs)
+	}
+	return nil
 }

youtubedl/install.go

@@ -2,6 +2,7 @@ package youtubedl
 
 import (
 	"errors"
+	"log"
 	"os/exec"
 )
 
@@ -31,11 +32,15 @@ func installPyPip3() error {
 		[]string{"apt", "install", "python3", "pip3"},
 		[]string{"apk", "add", "python3", "py3-pip"},
 		[]string{"sudo", "apk", "add", "python3", "py3-pip"},
+		[]string{"/sbin/apk", "add", "python3", "py3-pip"},
+		[]string{"sudo", "/sbin/apk", "add", "python3", "py3-pip"},
 	} {
 		cmd := exec.Command(combo[0], combo[1:]...)
-		if err := cmd.Run(); err == nil {
+		err := cmd.Run()
+		if err == nil {
 			return nil
 		}
+		log.Println("%v: %v", err, combo)
 	}
 	return errors.New("cannot get python3 and pip3")
 }