/
main.go
164 lines (136 loc) · 4.64 KB
/
main.go
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package main
import (
"encoding/hex"
"net"
"net/url"
"os"
"os/signal"
"path"
"runtime/pprof"
"time"
"github.com/Wessie/appdirs"
"github.com/jessevdk/go-flags"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/izolight/magnetico/cmd/magneticod/bittorrent"
"github.com/izolight/magnetico/cmd/magneticod/dht"
"github.com/izolight/magnetico/pkg/persistence"
)
type cmdFlags struct {
DatabaseURL string `short:"d" long:"database" description:"URL of the database." env:"DATABASE"`
BindAddr []string `short:"b" long:"bind" description:"Address(es) that the Crawler should listen on." env:"BIND_ADDR" env-delim:"," default:"0.0.0.0:6881"`
Interval uint `short:"i" long:"interval" description:"Trawling Interval in milliseconds" env:"INTERVAL" default:"100"`
Verbose []bool `short:"v" long:"verbose" description:"Increase verbosity"`
Profile string `short:"p" long:"profile" description:"Enable profiling." choice:"cpu" choice:"memory" choice:"trace"`
}
type opFlags struct {
DatabaseURL *url.URL
BindAddr []*net.UDPAddr
Interval time.Duration
Verbosity int
Profile string
}
func main() {
loggerLevel := zap.NewAtomicLevel()
// Logging levels: ("debug", "info", "warn", "error", "dpanic", "panic", and "fatal").
logger := zap.New(zapcore.NewCore(
zapcore.NewConsoleEncoder(zap.NewDevelopmentEncoderConfig()),
zapcore.Lock(os.Stderr),
loggerLevel,
))
defer logger.Sync()
zap.ReplaceGlobals(logger)
// opFlags is the "operational flags"
opFlags := parseFlags()
zap.L().Info("magneticod v0.7.0 has been started.")
zap.L().Info("Copyright (C) 2017 Mert Bora ALPER <bora@boramalper.org>.")
zap.L().Info("Dedicated to Cemile Binay, in whose hands I thrived.")
switch opFlags.Verbosity {
case 0:
loggerLevel.SetLevel(zap.WarnLevel)
case 1:
loggerLevel.SetLevel(zap.InfoLevel)
default: // Default: i.e. in case of 2 or more.
// TODO: print the caller (function)'s name and line number!
loggerLevel.SetLevel(zap.DebugLevel)
}
zap.ReplaceGlobals(logger)
switch opFlags.Profile {
case "cpu":
file, err := os.OpenFile("magneticod_cpu.prof", os.O_CREATE|os.O_WRONLY, 0755)
if err != nil {
zap.L().Fatal("Could not open the cpu profile file!", zap.Error(err))
}
pprof.StartCPUProfile(file)
defer file.Close()
defer pprof.StopCPUProfile()
case "memory":
zap.L().Fatal("Memory profiling NOT IMPLEMENTED")
case "trace":
zap.L().Fatal("trace NOT IMPLEMENTED")
}
// Handle Ctrl-C gracefully.
interruptChan := make(chan os.Signal)
signal.Notify(interruptChan, os.Interrupt)
database, err := persistence.MakeDatabase(opFlags.DatabaseURL, logger)
if err != nil {
logger.Sugar().Fatalf("Could not open the database at `%s`: %s", opFlags.DatabaseURL, err.Error())
}
trawlingManager := dht.NewTrawlingManager(opFlags.BindAddr)
metadataSink := bittorrent.NewMetadataSink(2 * time.Minute)
// The Event Loop
for stopped := false; !stopped; {
select {
case result := <-trawlingManager.Output():
zap.L().Info("Trawled!", zap.String("infoHash", result.InfoHash.String()))
exists, err := database.DoesTorrentExist(result.InfoHash[:])
if err != nil {
zap.L().Fatal("Could not check whether torrent exists!", zap.Error(err))
} else if !exists {
metadataSink.Sink(result)
}
case metadata := <-metadataSink.Drain():
if err := database.AddNewTorrent(metadata.InfoHash, metadata.Name, metadata.Files); err != nil {
logger.Sugar().Fatalf("Could not add new torrent %x to the database: %s",
metadata.InfoHash, err.Error())
}
zap.L().Info("Fetched!", zap.String("name", metadata.Name), zap.String("infoHash", hex.EncodeToString(metadata.InfoHash)))
case <-interruptChan:
trawlingManager.Terminate()
stopped = true
}
}
if err = database.Close(); err != nil {
zap.L().Error("Could not close database!", zap.Error(err))
}
}
func parseFlags() *opFlags {
opF := new(opFlags)
cmdF := new(cmdFlags)
_, err := flags.Parse(cmdF)
if err != nil {
// Do not print any error messages as jessevdk/go-flags already did.
os.Exit(1)
}
if cmdF.DatabaseURL == "" {
cmdF.DatabaseURL = "sqlite3://" + path.Join(
appdirs.UserDataDir("magneticod", "", "", false),
"database.sqlite3",
)
}
opF.DatabaseURL, err = url.Parse(cmdF.DatabaseURL)
if err != nil {
zap.L().Fatal("Failed to parse DB URL", zap.Error(err))
}
for _, addr := range cmdF.BindAddr {
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
zap.L().Fatal("Failed to parse Address", zap.Error(err))
}
opF.BindAddr = append(opF.BindAddr, udpAddr)
}
opF.Interval = time.Duration(cmdF.Interval) * time.Millisecond
opF.Verbosity = len(cmdF.Verbose)
opF.Profile = cmdF.Profile
return opF
}