/
worker.go
173 lines (153 loc) · 3.71 KB
/
worker.go
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package http
import (
"bytes"
"expvar"
"net"
"net/netip"
"time"
"unsafe"
"github.com/crimist/trakx/tracker/config"
"github.com/crimist/trakx/tracker/stats"
"github.com/pkg/errors"
"go.uber.org/zap"
)
type workers struct {
tracker *HTTPTracker
listener net.Listener
fileCache config.EmbeddedCache
}
func (w *workers) startWorkers(num int) {
config.Logger.Debug("Starting http workers", zap.Int("count", num))
for i := 0; i < num; i++ {
go w.work()
}
}
func (w *workers) work() {
expvarHandler := expvar.Handler()
statRespWriter := fakeRespWriter{}
data := make([]byte, httpRequestMax)
for {
conn, err := w.listener.Accept()
if err != nil {
// if socket is closed we're done
if errors.Unwrap(err) == net.ErrClosed {
break
}
// otherwise log the error
config.Logger.Error("http connection accept failed", zap.Error(err))
stats.ServerErrors.Add(1)
continue
}
now := time.Now()
conn.SetReadDeadline(now.Add(config.Config.HTTP.Timeout.Read))
conn.SetWriteDeadline(now.Add(config.Config.HTTP.Timeout.Write))
size, err := conn.Read(data)
if err != nil {
conn.Close()
continue
}
stats.Hits.Add(1)
p, err := parse(data, size)
if err == invalidParse || p.Method != "GET" {
// invalid request
writeStatus(conn, "400")
conn.Close()
continue
} else if err != nil {
// error in parse
config.Logger.Error("error parsing request", zap.Error(err), zap.Any("request data", data))
writeStatus(conn, "500")
conn.Close()
stats.ServerErrors.Add(1)
continue
}
switch p.Path {
case "/announce":
var v announceParams
for _, param := range p.Params {
var key, val string
if equal := bytes.Index(param, []byte("=")); equal == -1 {
key = string(param) // noescape
val = "1"
} else {
key = string(param[:equal]) // noescape
val = string(param[equal+1:]) // escape
}
switch key {
case "compact":
if val == "1" {
v.compact = true
}
case "no_peer_id":
if val == "1" {
v.nopeerid = true
}
case "left":
if val == "0" {
v.noneleft = true
}
case "event":
v.event = val
case "port":
v.port = val
case "info_hash":
v.hash = val
case "peer_id":
v.peerid = val
case "numwant":
v.numwant = val
}
}
var ip netip.Addr
var ipStr string
forwarded, forwardedIP := parseForwarded(data)
if forwarded {
if forwardedIP == nil {
w.tracker.clientError(conn, "Failed to parse X-Forwarded-For")
break
}
ipStr = *(*string)(unsafe.Pointer(&forwardedIP))
} else {
ipStr, _, _ = net.SplitHostPort(conn.RemoteAddr().String())
}
ip, err := netip.ParseAddr(ipStr)
if err != nil {
config.Logger.Warn("Failed to parse value from X-Forwarded-For", zap.String("ip string", ipStr), zap.Error(err))
w.tracker.clientError(conn, "Failed to parse forwarded IP")
break
}
w.tracker.announce(conn, &v, ip)
case "/scrape":
var count int
for i := 0; i < len(p.Params); i++ {
if len(p.Params[i]) < 10 || !bytes.Equal(p.Params[i][0:10], []byte("info_hash=")) {
p.Params[i] = nil
} else {
p.Params[i] = p.Params[i][10:]
count++
}
}
if count == 0 {
w.tracker.clientError(conn, "no infohashes")
break
}
w.tracker.scrape(conn, p.Params)
case "/heartbeat":
writeStatus(conn, "200")
case "/stats":
// Serves expvar handler but it's hacky af
statRespWriter.conn = conn
conn.Write(statsHeader)
expvarHandler.ServeHTTP(statRespWriter, nil)
default:
// check if file is embedded
if data, ok := w.fileCache[p.Path]; ok {
writeData(conn, data)
} else {
// otherwise return 404
writeStatus(conn, "404")
}
}
conn.Close()
}
}