mirror of
https://github.com/crawlab-team/crawlab.git
synced 2026-01-22 17:31:03 +01:00
279 lines
7.1 KiB
Go
279 lines
7.1 KiB
Go
package services
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import (
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"crawlab/constants"
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"crawlab/database"
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"crawlab/entity"
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"crawlab/model"
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"crawlab/model/config_spider"
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"crawlab/services/spider_handler"
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"crawlab/utils"
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"errors"
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"fmt"
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"github.com/apex/log"
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"github.com/globalsign/mgo/bson"
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uuid "github.com/satori/go.uuid"
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"github.com/spf13/viper"
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"gopkg.in/yaml.v2"
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"os"
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"path/filepath"
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"runtime/debug"
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"strings"
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)
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func GenerateConfigSpiderFiles(spider model.Spider, configData entity.ConfigSpiderData) error {
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// 校验Spiderfile正确性
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if err := ValidateSpiderfile(configData); err != nil {
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return err
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}
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// 构造代码生成器
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generator := config_spider.ScrapyGenerator{
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Spider: spider,
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ConfigData: configData,
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}
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// 生成代码
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if err := generator.Generate(); err != nil {
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return err
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}
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return nil
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}
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// 验证Spiderfile
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func ValidateSpiderfile(configData entity.ConfigSpiderData) error {
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// 获取所有字段
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fields := config_spider.GetAllFields(configData)
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// 校验是否存在 start_url
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if configData.StartUrl == "" {
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return errors.New("spiderfile invalid: start_url is empty")
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}
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// 校验是否存在 start_stage
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if configData.StartStage == "" {
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return errors.New("spiderfile invalid: start_stage is empty")
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}
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// 校验是否存在 stages
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if len(configData.Stages) == 0 {
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return errors.New("spiderfile invalid: stages is empty")
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}
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// 校验stages
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dict := map[string]int{}
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for _, stage := range configData.Stages {
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stageName := stage.Name
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// stage 名称不能为空
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if stageName == "" {
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return errors.New("spiderfile invalid: stage name is empty")
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}
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// stage 名称不能为保留字符串
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// NOTE: 如果有其他Engine，可以扩展，默认为Scrapy
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if configData.Engine == "" || configData.Engine == constants.EngineScrapy {
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if strings.Contains(constants.ScrapyProtectedStageNames, stageName) {
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return errors.New(fmt.Sprintf("spiderfile invalid: stage name '%s' is protected", stageName))
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}
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} else {
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return errors.New(fmt.Sprintf("spiderfile invalid: engine '%s' is not implemented", configData.Engine))
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}
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// stage 名称不能重复
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if dict[stageName] == 1 {
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return errors.New(fmt.Sprintf("spiderfile invalid: stage name '%s' is duplicated", stageName))
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}
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dict[stageName] = 1
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// stage 字段不能为空
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if len(stage.Fields) == 0 {
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return errors.New(fmt.Sprintf("spiderfile invalid: stage '%s' has no fields", stageName))
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}
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// 是否包含 next_stage
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hasNextStage := false
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// 遍历字段列表
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for _, field := range stage.Fields {
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// stage 的 next stage 只能有一个
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if field.NextStage != "" {
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if hasNextStage {
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return errors.New(fmt.Sprintf("spiderfile invalid: stage '%s' has more than 1 next_stage", stageName))
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}
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hasNextStage = true
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}
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// 字段里 css 和 xpath 只能包含一个
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if field.Css != "" && field.Xpath != "" {
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return errors.New(fmt.Sprintf("spiderfile invalid: field '%s' in stage '%s' has both css and xpath set which is prohibited", field.Name, stageName))
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}
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}
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// stage 里 page_css 和 page_xpath 只能包含一个
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if stage.PageCss != "" && stage.PageXpath != "" {
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return errors.New(fmt.Sprintf("spiderfile invalid: stage '%s' has both page_css and page_xpath set which is prohibited", stageName))
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}
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// stage 里 list_css 和 list_xpath 只能包含一个
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if stage.ListCss != "" && stage.ListXpath != "" {
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return errors.New(fmt.Sprintf("spiderfile invalid: stage '%s' has both list_css and list_xpath set which is prohibited", stageName))
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}
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// 如果 stage 的 is_list 为 true 但 list_css 为空，报错
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if stage.IsList && (stage.ListCss == "" && stage.ListXpath == "") {
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return errors.New("spiderfile invalid: stage with is_list = true should have either list_css or list_xpath being set")
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}
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}
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// 校验字段唯一性
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if !IsUniqueConfigSpiderFields(fields) {
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return errors.New("spiderfile invalid: fields not unique")
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}
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// 字段名称不能为保留字符串
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for _, field := range fields {
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if strings.Contains(constants.ScrapyProtectedFieldNames, field.Name) {
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return errors.New(fmt.Sprintf("spiderfile invalid: field name '%s' is protected", field.Name))
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}
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}
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return nil
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}
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func IsUniqueConfigSpiderFields(fields []entity.Field) bool {
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dict := map[string]int{}
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for _, field := range fields {
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if dict[field.Name] == 1 {
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return false
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}
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dict[field.Name] = 1
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}
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return true
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}
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func ProcessSpiderFilesFromConfigData(spider model.Spider, configData entity.ConfigSpiderData) error {
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spiderDir := spider.Src
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// 删除已有的爬虫文件
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for _, fInfo := range utils.ListDir(spiderDir) {
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// 不删除Spiderfile
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if fInfo.Name() == "Spiderfile" {
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continue
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}
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// 删除其他文件
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if err := os.RemoveAll(filepath.Join(spiderDir, fInfo.Name())); err != nil {
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return err
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}
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}
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// 拷贝爬虫文件
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tplDir := "./template/scrapy"
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for _, fInfo := range utils.ListDir(tplDir) {
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// 跳过Spiderfile
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if fInfo.Name() == "Spiderfile" {
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continue
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}
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srcPath := filepath.Join(tplDir, fInfo.Name())
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if fInfo.IsDir() {
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dirPath := filepath.Join(spiderDir, fInfo.Name())
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if err := utils.CopyDir(srcPath, dirPath); err != nil {
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return err
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}
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} else {
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if err := utils.CopyFile(srcPath, filepath.Join(spiderDir, fInfo.Name())); err != nil {
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return err
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}
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}
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}
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// 更改爬虫文件
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if err := GenerateConfigSpiderFiles(spider, configData); err != nil {
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return err
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}
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// 打包为 zip 文件
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files, err := utils.GetFilesFromDir(spiderDir)
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if err != nil {
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return err
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}
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randomId := uuid.NewV4()
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tmpFilePath := filepath.Join(viper.GetString("other.tmppath"), spider.Name+"."+randomId.String()+".zip")
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spiderZipFileName := spider.Name + ".zip"
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if err := utils.Compress(files, tmpFilePath); err != nil {
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return err
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}
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// 获取 GridFS 实例
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s, gf := database.GetGridFs("files")
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defer s.Close()
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// 判断文件是否已经存在
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var gfFile model.GridFs
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if err := gf.Find(bson.M{"filename": spiderZipFileName}).One(&gfFile); err == nil {
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// 已经存在文件，则删除
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if err := gf.RemoveId(gfFile.Id); err != nil {
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log.Errorf("remove grid fs error: %s", err.Error())
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debug.PrintStack()
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return err
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}
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}
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// 上传到GridFs
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fid, err := UploadToGridFs(spiderZipFileName, tmpFilePath)
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if err != nil {
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log.Errorf("upload to grid fs error: %s", err.Error())
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return err
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}
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// 保存爬虫 FileId
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spider.FileId = fid
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_ = spider.Save()
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// 获取爬虫同步实例
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spiderSync := spider_handler.SpiderSync{
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Spider: spider,
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}
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// 获取gfFile
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gfFile2 := model.GetGridFs(spider.FileId)
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// 生成MD5
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spiderSync.CreateMd5File(gfFile2.Md5)
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return nil
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}
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func GenerateSpiderfileFromConfigData(spider model.Spider, configData entity.ConfigSpiderData) error {
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// Spiderfile 路径
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sfPath := filepath.Join(spider.Src, "Spiderfile")
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// 生成Yaml内容
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sfContentByte, err := yaml.Marshal(configData)
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if err != nil {
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return err
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}
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// 打开文件
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var f *os.File
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if utils.Exists(sfPath) {
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f, err = os.OpenFile(sfPath, os.O_WRONLY|os.O_TRUNC, 0777)
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} else {
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f, err = os.OpenFile(sfPath, os.O_CREATE, 0777)
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}
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if err != nil {
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return err
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}
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defer f.Close()
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// 写入内容
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if _, err := f.Write(sfContentByte); err != nil {
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return err
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}
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return nil
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}
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