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spiders.go
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spiders.go
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// MIT License
// Copyright (c) 2023 wetrycode
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package tegenaria
import "sync"
// SpiderInterface Tegenaria spider interface, developer can custom spider must be based on
// this interface to achieve custom spider.
type SpiderInterface interface {
// StartRequest 通过GetFeedUrls()获取种子
// urls并构建初始请求
StartRequest(req chan<- *Context)
// Parser 默认的请求响应解析函数
// 在解析过程中生成的新的请求可以推送到req channel
Parser(resp *Context, req chan<- *Context) error
// ErrorHandler 错误处理函数,允许在此过程中生成新的请求
// 并推送到req channel
ErrorHandler(err *Context, req chan<- *Context)
// GetName 获取spider名称
GetName() string
// GetFeedUrls 获取种子urls
GetFeedUrls() []string
}
// BaseSpider base spider
type BaseSpider struct {
// Name spider name
Name string
// FeedUrls feed urls
FeedUrls []string
}
// Spiders 全局spiders管理器
// 用于接收注册的SpiderInterface实例
type Spiders struct {
// SpidersModules spider名称和spider实例的映射
SpidersModules map[string]SpiderInterface
// Parsers parser函数名和函数的映射
// 用于序列化和反序列化
Parsers map[string]Parser
}
// SpidersList 注册到引擎的爬虫列表
var SpidersList *Spiders
// onceSpiders SpidersList只初始化一次
var onceSpiders sync.Once
// NewBaseSpider 构建公共爬虫对象
func NewBaseSpider(name string, feedUrls []string) *BaseSpider {
return &BaseSpider{
Name: name,
FeedUrls: feedUrls,
}
}
// NewSpiders 构建Spiders实例
func NewSpiders() *Spiders {
onceSpiders.Do(func() {
SpidersList = &Spiders{
SpidersModules: make(map[string]SpiderInterface),
Parsers: make(map[string]Parser),
}
})
return SpidersList
}
// Register spider实例注册到Spiders.SpidersModules
func (s *Spiders) Register(spider SpiderInterface) error {
// 爬虫名不能为空
if len(spider.GetName()) == 0 {
return ErrEmptySpiderName
}
// 爬虫名不允许重复
if _, ok := s.SpidersModules[spider.GetName()]; ok {
return ErrDuplicateSpiderName
}
s.SpidersModules[spider.GetName()] = spider
return nil
}
// GetSpider 通过爬虫名获取spider实例
func (s *Spiders) GetSpider(name string) (SpiderInterface, error) {
if _, ok := s.SpidersModules[name]; !ok {
return nil, ErrSpiderNotExist
}
return s.SpidersModules[name], nil
}
func (s *Spiders) GetAllSpidersName() []string {
spidersModules := s.SpidersModules
names := []string{}
for spider := range spidersModules {
names = append(names, spider)
}
return names
}