83 lines
2.7 KiB
Go
83 lines
2.7 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
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import (
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"fmt"
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"golang.org/x/net/context"
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"github.com/jzelinskie/trakr/bittorrent"
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)
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// Hook abstracts the concept of anything that needs to interact with a
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// BitTorrent client's request and response to a BitTorrent tracker.
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type Hook interface {
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HandleAnnounce(context.Context, *bittorrent.AnnounceRequest, *bittorrent.AnnounceResponse) error
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HandleScrape(context.Context, *bittorrent.ScrapeRequest, *bittorrent.ScrapeResponse) error
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}
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// HookConstructor is a function used to create a new instance of a Hook.
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type HookConstructor func(interface{}) (Hook, error)
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var preHooks = make(map[string]HookConstructor)
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// RegisterPreHook makes a HookConstructor available by the provided name.
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//
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// If this function is called twice with the same name or if the
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// HookConstructor is nil, it panics.
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func RegisterPreHook(name string, con HookConstructor) {
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if con == nil {
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panic("trakr: could not register nil HookConstructor")
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}
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if _, dup := preHooks[name]; dup {
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panic("trakr: could not register duplicate HookConstructor: " + name)
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}
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preHooks[name] = con
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}
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// NewPreHook creates an instance of the given PreHook by name.
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func NewPreHook(name string, config interface{}) (Hook, error) {
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con, ok := preHooks[name]
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if !ok {
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return nil, fmt.Errorf("trakr: unknown PreHook %q (forgotten import?)", name)
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}
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return con(config)
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}
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var postHooks = make(map[string]HookConstructor)
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// RegisterPostHook makes a HookConstructor available by the provided name.
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//
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// If this function is called twice with the same name or if the
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// HookConstructor is nil, it panics.
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func RegisterPostHook(name string, con HookConstructor) {
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if con == nil {
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panic("trakr: could not register nil HookConstructor")
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}
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if _, dup := postHooks[name]; dup {
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panic("trakr: could not register duplicate HookConstructor: " + name)
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}
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preHooks[name] = con
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}
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// NewPostHook creates an instance of the given PostHook by name.
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func NewPostHook(name string, config interface{}) (Hook, error) {
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con, ok := preHooks[name]
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if !ok {
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return nil, fmt.Errorf("trakr: unknown PostHook %q (forgotten import?)", name)
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}
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return con(config)
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}
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