128 lines
3.7 KiB
Go
128 lines
3.7 KiB
Go
// Package middleware implements the TrackerLogic interface by executing
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// a series of middleware hooks.
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package middleware
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import (
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"context"
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"time"
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"github.com/chihaya/chihaya/bittorrent"
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"github.com/chihaya/chihaya/frontend"
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"github.com/chihaya/chihaya/pkg/log"
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"github.com/chihaya/chihaya/pkg/stop"
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"github.com/chihaya/chihaya/storage"
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)
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// Config holds the configuration common across all middleware.
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type Config struct {
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AnnounceInterval time.Duration `yaml:"announce_interval"`
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MaxNumWant uint32 `yaml:"max_numwant"`
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DefaultNumWant uint32 `yaml:"default_numwant"`
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MaxScrapeInfoHashes uint32 `yaml:"max_scrape_infohashes"`
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}
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var _ frontend.TrackerLogic = &Logic{}
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// NewLogic creates a new instance of a TrackerLogic that executes the provided
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// middleware hooks.
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func NewLogic(cfg Config, peerStore storage.PeerStore, preHooks, postHooks []Hook) *Logic {
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l := &Logic{
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announceInterval: cfg.AnnounceInterval,
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peerStore: peerStore,
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preHooks: []Hook{&sanitizationHook{cfg.MaxNumWant, cfg.DefaultNumWant, cfg.MaxScrapeInfoHashes}},
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postHooks: append(postHooks, &swarmInteractionHook{store: peerStore}),
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}
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l.preHooks = append(l.preHooks, preHooks...)
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l.preHooks = append(l.preHooks, &responseHook{store: peerStore})
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return l
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}
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// Logic is an implementation of the TrackerLogic that functions by
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// executing a series of middleware hooks.
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type Logic struct {
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announceInterval time.Duration
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peerStore storage.PeerStore
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preHooks []Hook
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postHooks []Hook
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}
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// HandleAnnounce generates a response for an Announce.
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func (l *Logic) HandleAnnounce(ctx context.Context, req *bittorrent.AnnounceRequest) (_ context.Context, resp *bittorrent.AnnounceResponse, err error) {
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resp = &bittorrent.AnnounceResponse{
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Interval: l.announceInterval,
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MinInterval: l.announceInterval,
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Compact: req.Compact,
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}
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for _, h := range l.preHooks {
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if ctx, err = h.HandleAnnounce(ctx, req, resp); err != nil {
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return nil, nil, err
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}
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}
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log.Debug("generated announce response", resp)
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return ctx, resp, nil
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}
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// AfterAnnounce does something with the results of an Announce after it has
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// been completed.
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func (l *Logic) AfterAnnounce(ctx context.Context, req *bittorrent.AnnounceRequest, resp *bittorrent.AnnounceResponse) {
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var err error
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for _, h := range l.postHooks {
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if ctx, err = h.HandleAnnounce(ctx, req, resp); err != nil {
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log.Error("post-announce hooks failed", log.Err(err))
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return
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}
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}
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}
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// HandleScrape generates a response for a Scrape.
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func (l *Logic) HandleScrape(ctx context.Context, req *bittorrent.ScrapeRequest) (_ context.Context, resp *bittorrent.ScrapeResponse, err error) {
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resp = &bittorrent.ScrapeResponse{
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Files: make([]bittorrent.Scrape, 0, len(req.InfoHashes)),
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}
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for _, h := range l.preHooks {
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if ctx, err = h.HandleScrape(ctx, req, resp); err != nil {
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return nil, nil, err
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}
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}
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log.Debug("generated scrape response", resp)
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return ctx, resp, nil
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}
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// AfterScrape does something with the results of a Scrape after it has been
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// completed.
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func (l *Logic) AfterScrape(ctx context.Context, req *bittorrent.ScrapeRequest, resp *bittorrent.ScrapeResponse) {
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var err error
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for _, h := range l.postHooks {
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if ctx, err = h.HandleScrape(ctx, req, resp); err != nil {
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log.Error("post-scrape hooks failed", log.Err(err))
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return
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}
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}
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}
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// Stop stops the Logic.
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//
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// This stops any hooks that implement stop.stop.
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func (l *Logic) Stop() []error {
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stopGroup := stop.NewGroup()
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for _, hook := range l.preHooks {
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stoppable, ok := hook.(stop.Stopper)
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if ok {
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stopGroup.Add(stoppable)
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}
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}
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for _, hook := range l.postHooks {
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stoppable, ok := hook.(stop.Stopper)
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if ok {
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stopGroup.Add(stoppable)
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}
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}
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return stopGroup.Stop()
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}
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