yttopodcast: complete service for podcast feed and bouncer

Signed-off-by: HeshamTB <hishaminv@gmail.com>

.gitignore

@@ -0,0 +1,3 @@
+cmd/yttopodcast/yttopodcast
+cmd/yttopodcast/feeds
+

cmd/yttopodcast/main.go

@@ -0,0 +1,114 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"time"
+
+	"gitea.hbanafa.com/hesham/yttopodcast/bouncer"
+	"gitea.hbanafa.com/hesham/yttopodcast/feed"
+	"gitea.hbanafa.com/hesham/yttopodcast/ytlinkprov"
+)
+
+var (
+    l log.Logger
+
+    listenAddr  = flag.String("addr", "0.0.0.0:8086", "bouncer listen address")
+    fileServAdd  = flag.String("fs-addr", "0.0.0.0:8087", "http file server listen address")
+    interval = flag.Int("interval", 30, "update interval for feed in minutes")
+    chan_id = flag.String("id", "", "YouTube channel ID")
+    bounc_url = flag.String("bouncer", "http://localhost:8081/?id=%s", "bouncer url as format string")
+    lang = flag.String("lang", "en", "content language")
+)
+
+
+func main() {
+    
+    flag.Parse()
+    l = *log.Default()
+
+    if *chan_id == "" {
+        l.Println("no channel id provided")
+        os.Exit(1)
+    }
+    
+    cache, err := ytlinkprov.NewCachedLinkProvider(time.Minute * time.Duration(*interval))
+    if err != nil {
+        l.Println(err.Error())
+        os.Exit(1)
+    }
+
+    bouncer, err := bouncer.NewBouncerHTTPServer(context.Background(), *listenAddr, cache)
+    if err != nil {
+        l.Println(err.Error())
+        os.Exit(1)
+    }
+
+    // This goro is sleeping until interval or SIGINT
+    // Another one is running the bouncer
+
+    go func() {
+        l.Printf("http bouncer server starting on %s\n", bouncer.Addr)
+        l.Println(bouncer.ListenAndServe())
+    }()
+
+    os.Mkdir("feeds", 0700)
+
+    mux := http.NewServeMux()
+    mux.Handle("GET /", http.FileServer(http.Dir("feeds")))
+    fileServer := http.Server{
+        Addr: *fileServAdd,
+        Handler: mux,
+        ErrorLog: &l,
+        ReadTimeout: time.Second * 20,
+        WriteTimeout: time.Second * 20,
+    }
+
+    go func() {
+        l.Printf("http file server starting on %s\n", fileServer.Addr)
+        l.Println(fileServer.ListenAndServe())
+    }()
+
+    err = genFeed()
+    if err != nil {
+        l.Println(err.Error())
+        os.Exit(1)
+    }
+    
+    sig := make(chan os.Signal)
+
+    signal.Notify(sig, os.Interrupt, os.Kill)
+
+    l:
+    for {
+        select {
+        case s := <-sig:
+            l.Println("got ", s.String())
+            fileServer.Shutdown(context.Background())
+            bouncer.Shutdown(context.Background())
+            break l
+        case <-time.NewTicker(time.Minute * time.Duration(*interval)).C:
+            l.Println("tick")
+            genFeed()
+    }}
+
+}
+
+func genFeed() error {
+
+    l.Println("generating feed")
+    file, err := os.Create("./feeds/f.xml")
+    if err != nil {
+        return err
+    }
+    defer file.Close()
+
+    return feed.ConvertYtToRss(file, *chan_id, feed.RSSMetadata{
+        Languge: *lang,
+        BounceURL: *bounc_url,
+    })
+}