124 lines
3.6 KiB
Go
124 lines
3.6 KiB
Go
// Package middleware implements the TrackerLogic interface by executing
|
|
// a series of middleware hooks.
|
|
package middleware
|
|
|
|
import (
|
|
"context"
|
|
"time"
|
|
|
|
log "github.com/Sirupsen/logrus"
|
|
"github.com/chihaya/chihaya/bittorrent"
|
|
"github.com/chihaya/chihaya/frontend"
|
|
"github.com/chihaya/chihaya/pkg/stopper"
|
|
"github.com/chihaya/chihaya/storage"
|
|
)
|
|
|
|
// Config holds the configuration common across all middleware.
|
|
type Config struct {
|
|
AnnounceInterval time.Duration `yaml:"announce_interval"`
|
|
MaxNumWant uint32 `yaml:"max_numwant"`
|
|
DefaultNumWant uint32 `yaml:"default_numwant"`
|
|
}
|
|
|
|
var _ frontend.TrackerLogic = &Logic{}
|
|
|
|
// NewLogic creates a new instance of a TrackerLogic that executes the provided
|
|
// middleware hooks.
|
|
func NewLogic(cfg Config, peerStore storage.PeerStore, preHooks, postHooks []Hook) *Logic {
|
|
l := &Logic{
|
|
announceInterval: cfg.AnnounceInterval,
|
|
peerStore: peerStore,
|
|
preHooks: []Hook{&sanitizationHook{maxNumWant: cfg.MaxNumWant, defaultNumWant: cfg.DefaultNumWant}},
|
|
postHooks: append(postHooks, &swarmInteractionHook{store: peerStore}),
|
|
}
|
|
|
|
l.preHooks = append(l.preHooks, preHooks...)
|
|
l.preHooks = append(l.preHooks, &responseHook{store: peerStore})
|
|
|
|
return l
|
|
}
|
|
|
|
// Logic is an implementation of the TrackerLogic that functions by
|
|
// executing a series of middleware hooks.
|
|
type Logic struct {
|
|
announceInterval time.Duration
|
|
peerStore storage.PeerStore
|
|
preHooks []Hook
|
|
postHooks []Hook
|
|
}
|
|
|
|
// HandleAnnounce generates a response for an Announce.
|
|
func (l *Logic) HandleAnnounce(ctx context.Context, req *bittorrent.AnnounceRequest) (resp *bittorrent.AnnounceResponse, err error) {
|
|
resp = &bittorrent.AnnounceResponse{
|
|
Interval: l.announceInterval,
|
|
MinInterval: l.announceInterval,
|
|
Compact: req.Compact,
|
|
}
|
|
for _, h := range l.preHooks {
|
|
if ctx, err = h.HandleAnnounce(ctx, req, resp); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return resp, nil
|
|
}
|
|
|
|
// AfterAnnounce does something with the results of an Announce after it has
|
|
// been completed.
|
|
func (l *Logic) AfterAnnounce(ctx context.Context, req *bittorrent.AnnounceRequest, resp *bittorrent.AnnounceResponse) {
|
|
var err error
|
|
for _, h := range l.postHooks {
|
|
if ctx, err = h.HandleAnnounce(ctx, req, resp); err != nil {
|
|
log.Errorln("chihaya: post-announce hooks failed:", err.Error())
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// HandleScrape generates a response for a Scrape.
|
|
func (l *Logic) HandleScrape(ctx context.Context, req *bittorrent.ScrapeRequest) (resp *bittorrent.ScrapeResponse, err error) {
|
|
resp = &bittorrent.ScrapeResponse{
|
|
Files: make(map[bittorrent.InfoHash]bittorrent.Scrape),
|
|
}
|
|
for _, h := range l.preHooks {
|
|
if ctx, err = h.HandleScrape(ctx, req, resp); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return resp, nil
|
|
}
|
|
|
|
// AfterScrape does something with the results of a Scrape after it has been
|
|
// completed.
|
|
func (l *Logic) AfterScrape(ctx context.Context, req *bittorrent.ScrapeRequest, resp *bittorrent.ScrapeResponse) {
|
|
var err error
|
|
for _, h := range l.postHooks {
|
|
if ctx, err = h.HandleScrape(ctx, req, resp); err != nil {
|
|
log.Errorln("chihaya: post-scrape hooks failed:", err.Error())
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// Stop stops the Logic.
|
|
//
|
|
// This stops any hooks that implement stopper.Stopper.
|
|
func (l *Logic) Stop() []error {
|
|
stopGroup := stopper.NewStopGroup()
|
|
for _, hook := range l.preHooks {
|
|
stoppable, ok := hook.(stopper.Stopper)
|
|
if ok {
|
|
stopGroup.Add(stoppable)
|
|
}
|
|
}
|
|
|
|
for _, hook := range l.postHooks {
|
|
stoppable, ok := hook.(stopper.Stopper)
|
|
if ok {
|
|
stopGroup.Add(stoppable)
|
|
}
|
|
}
|
|
|
|
return stopGroup.Stop()
|
|
}
|