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// SPDX-License-Identifier: ISC
// Copyright © 2022 siddharth <s@ricketyspace.net>
// fern is a simple media feed downloader.
//
// It depends on yt-dlp to download the media found in the media feeds
// to your computer.
//
// fern currently supports YoutTube, NPR, and Podcast feeds.
//
// Information about what media feeds to download, the location of
// yt-dlp program on your computer, and the directory where the media
// should be downloaded to must be specified in a config file which
// fern expects to be at $HOME/.config/fern/fern.json
//
// fern's config file contains three fields:
//
// {
// "ydl-path": "/usr/local/bin/yt-dlp",
// "dump-dir": "~/media/feeds", // media feed download directory
// "feeds": [...] // list of media feeds.
// }
//
// Each item in the media "feeds" must be:
//
// {
// "id": "media-feed-id", // unique identifier for the media feed
// "source": "https://feeds.npr.org/XXXX/rss.xml", // media feed url
// "schema": "npr", // must be "youtube" or "npr" or "podcast"
// "last": 5 // the last N items that should be downloaded
// "title-contains": "tiny desk" // optional. if specified, downloads entries with title matching the value of this field
// }
//
// You may download an example config file for fern from
// https://ricketyspace.net/fern/fern.json
//
// Run fern with:
//
// $ fern -run
//
// To print fern's version, do:
//
// $ fern -version
package main
import (
"flag"
"fmt"
"log"
"os"
"path"
"runtime"
"runtime/pprof"
"time"
"ricketyspace.net/fern/config"
"ricketyspace.net/fern/db"
"ricketyspace.net/fern/state"
"ricketyspace.net/fern/version"
)
var fConf *config.FernConfig
var pState *state.ProcessState
var vFlag *bool
var rFlag *bool
var pFlag *string
var profileSuffix string
func init() {
var err error
// Get fern config.
fConf, err = config.Read()
if err != nil {
fmt.Printf("Error: %v\n", err.Error())
os.Exit(1)
}
// Initialize process state.
pState = state.NewProcessState()
// Open database.
pState.DB, err = db.Open()
if err != nil {
fmt.Printf("Error: %v\n", err.Error())
os.Exit(1)
}
// Parse args.
vFlag = flag.Bool("version", false, "Print version")
rFlag = flag.Bool("run", false, "Run fern")
pFlag = flag.String("prof", "",
"Write cpu and memory profiles to the specified directory")
flag.Parse()
if *vFlag {
fmt.Printf("%s\n", version.Version)
os.Exit(0)
}
if !*rFlag {
printUsage(2)
}
if *pFlag != "" {
profileSuffix = fmt.Sprintf("%d.prof", time.Now().UnixMilli())
}
// Setup logger.
log.SetFlags(0)
}
func printUsage(exit int) {
fmt.Printf("fern [ -run [ -prof DIR ] | -version ]\n")
flag.PrintDefaults()
os.Exit(exit)
}
func main() {
// Setup CPU and memory profiling if enabled.
if *pFlag != "" {
// CPU profiling.
cn := path.Join(*pFlag, "cpu."+profileSuffix)
cf, err := os.Create(cn)
if err != nil {
log.Fatal("could not create CPU profile: ", err)
}
defer cf.Close()
if err := pprof.StartCPUProfile(cf); err != nil {
log.Fatal("could not start CPU profile: ", err)
}
defer pprof.StopCPUProfile()
// Memory profiling.
mn := path.Join(*pFlag, "mem."+profileSuffix)
mf, err := os.Create(mn)
if err != nil {
log.Fatal("could not create memory profile: ", err)
}
defer mf.Close()
defer func() {
runtime.GC()
if err := pprof.WriteHeapProfile(mf); err != nil {
log.Fatal("could not write memory profile: ", err)
}
}()
log.Printf("Profiling enabled. CPU and memory profiles"+
" will be written to %s and %s", cn, mn)
}
// Write database to disk before returning.
defer pState.DB.Write()
// Process all feeds.
processing := 0
for _, feed := range fConf.Feeds {
f := feed
go f.Process(pState)
processing += 1
}
// Wait for all feeds finish processing.
for processing > 0 {
fTxt := "feeds"
if processing == 1 {
fTxt = "feed"
}
fmt.Printf("Waiting for %d %s to finish processing\n",
processing, fTxt)
fr := <-pState.FeedResultChan
if fr.Err == nil {
fmt.Printf("[%s]: %s\n",
fr.FeedId, fr.FeedResult)
} else {
fmt.Printf("[%s]: %s: %v\n",
fr.FeedId, fr.FeedResult, fr.Err.Error())
}
processing -= 1
}
}
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