122 lines
3.6 KiB
Go
122 lines
3.6 KiB
Go
// Copyright 2016 Jimmy Zelinskie
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package backend implements the TrackerLogic interface by executing
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// a series of middleware hooks.
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package backend
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import (
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"log"
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"time"
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"golang.org/x/net/context"
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"github.com/jzelinskie/trakr/bittorrent"
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"github.com/jzelinskie/trakr/frontend"
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)
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type BackendConfig struct {
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AnnounceInterval time.Duration `yaml:"announce_interval"`
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}
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var _ frontend.TrackerLogic = &Backend{}
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func New(config BackendConfig, peerStore PeerStore, announcePreHooks, announcePostHooks, scrapePreHooks, scrapePostHooks []Hook) (*Backend, error) {
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toReturn := &Backend{
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announceInterval: config.AnnounceInterval,
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peerStore: peerStore,
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announcePreHooks: announcePreHooks,
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announcePostHooks: announcePostHooks,
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scrapePreHooks: scrapePreHooks,
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scrapePostHooks: scrapePostHooks,
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}
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if len(toReturn.announcePreHooks) == 0 {
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toReturn.announcePreHooks = []Hook{nopHook{}}
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}
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if len(toReturn.announcePostHooks) == 0 {
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toReturn.announcePostHooks = []Hook{nopHook{}}
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}
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if len(toReturn.scrapePreHooks) == 0 {
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toReturn.scrapePreHooks = []Hook{nopHook{}}
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}
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if len(toReturn.scrapePostHooks) == 0 {
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toReturn.scrapePostHooks = []Hook{nopHook{}}
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}
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return toReturn, nil
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}
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// Backend is a protocol-agnostic backend of a BitTorrent tracker.
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type Backend struct {
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announceInterval time.Duration
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peerStore PeerStore
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announcePreHooks []Hook
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announcePostHooks []Hook
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scrapePreHooks []Hook
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scrapePostHooks []Hook
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}
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// HandleAnnounce generates a response for an Announce.
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func (b *Backend) HandleAnnounce(ctx context.Context, req *bittorrent.AnnounceRequest) (*bittorrent.AnnounceResponse, error) {
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resp := &bittorrent.AnnounceResponse{
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Interval: b.announceInterval,
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}
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for _, h := range b.announcePreHooks {
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if err := h.HandleAnnounce(ctx, req, resp); err != nil {
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return nil, err
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}
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}
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return 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 (b *Backend) AfterAnnounce(ctx context.Context, req *bittorrent.AnnounceRequest, resp *bittorrent.AnnounceResponse) {
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for _, h := range b.announcePostHooks {
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if err := h.HandleAnnounce(ctx, req, resp); err != nil {
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log.Println("trakr: post-announce hooks failed:", err.Error())
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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 (b *Backend) HandleScrape(ctx context.Context, req *bittorrent.ScrapeRequest) (*bittorrent.ScrapeResponse, error) {
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resp := &bittorrent.ScrapeResponse{
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Files: make(map[bittorrent.InfoHash]bittorrent.Scrape),
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}
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for _, h := range b.scrapePreHooks {
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if err := h.HandleScrape(ctx, req, resp); err != nil {
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return nil, err
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}
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}
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return 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 (b *Backend) AfterScrape(ctx context.Context, req *bittorrent.ScrapeRequest, resp *bittorrent.ScrapeResponse) {
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for _, h := range b.scrapePostHooks {
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if err := h.HandleScrape(ctx, req, resp); err != nil {
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log.Println("trakr: post-scrape hooks failed:", err.Error())
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return
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}
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}
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}
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