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cluster.go
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cluster.go
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package support
import (
"encoding/json"
. "github.com/wcong/ants-go/ants/cluster"
"github.com/wcong/ants-go/ants/crawler"
"github.com/wcong/ants-go/ants/http"
"github.com/wcong/ants-go/ants/node"
"github.com/wcong/ants-go/ants/util"
"log"
"sync"
)
type DefaultCluster struct {
clusterInfo *ClusterInfo
RequestStatus *RequestStatus
mutex *sync.Mutex
crawlStatus *crawler.CrawlerStatus
settings *util.Settings
}
func NewDefaultCluster(settings *util.Settings) *DefaultCluster {
clusterInfo := &ClusterInfo{CLUSTER_STATUS_INIT, settings.Name, make([]*node.NodeInfo, 0), nil, nil}
requestStatus := NewRequestStatus()
cluster := &DefaultCluster{clusterInfo, requestStatus, new(sync.Mutex), crawler.NewCrawlerStatus(), settings}
return cluster
}
func (this *DefaultCluster) Init(node *node.NodeInfo) {
this.clusterInfo.LocalNode = node
this.clusterInfo.NodeList = append(this.clusterInfo.NodeList, node)
}
func (this *DefaultCluster) GetClusterInfo() *ClusterInfo {
return this.clusterInfo
}
// get crawl status
func (this *DefaultCluster) CrawlStatus() *crawler.CrawlerStatus {
return this.crawlStatus
}
func (this *DefaultCluster) DeleteDeadNode(nodeName string) {
this.mutex.Lock()
this.removeNode(nodeName)
this.RequestStatus.DeleteDeadNode(nodeName)
this.mutex.Unlock()
}
// of course it is not local node
func (this *DefaultCluster) removeNode(nodeName string) {
deleteIndex := -1
for index, node := range this.clusterInfo.NodeList {
if node.Name == nodeName {
deleteIndex = index
}
}
if deleteIndex >= 0 {
oldNodeList := this.clusterInfo.NodeList
this.clusterInfo.NodeList = append(oldNodeList[0:deleteIndex], oldNodeList[deleteIndex+1:len(oldNodeList)]...)
}
}
// is local node master node
func (this *DefaultCluster) IsMasterNode() bool {
if this.clusterInfo.MasterNode == nil {
return false
}
return this.clusterInfo.LocalNode.Name == this.clusterInfo.MasterNode.Name
}
// add a node to cluster node list
func (this *DefaultCluster) AddNode(nodeInfo *node.NodeInfo) {
this.mutex.Lock()
defer this.mutex.Unlock()
for _, node := range this.clusterInfo.NodeList {
if node.Name == nodeInfo.Name {
return
}
}
this.clusterInfo.NodeList = append(this.clusterInfo.NodeList, nodeInfo)
}
func (this *DefaultCluster) GetAllNode() []*node.NodeInfo {
return this.clusterInfo.NodeList
}
func (this *DefaultCluster) GetRequestStatus() *RequestStatus {
return this.RequestStatus
}
// make master node by node name
func (this *DefaultCluster) MakeMasterNode(nodeName string) {
for _, node := range this.clusterInfo.NodeList {
if node.Name == nodeName {
this.clusterInfo.MasterNode = node
}
}
}
// choose a new master node
func (this *DefaultCluster) ElectMaster() *node.NodeInfo {
this.clusterInfo.MasterNode = this.clusterInfo.NodeList[0]
for _, node := range this.clusterInfo.NodeList {
if this.clusterInfo.MasterNode.Name > node.Name {
this.clusterInfo.MasterNode = node
}
}
return this.clusterInfo.MasterNode
}
//when start a spider ,cluster should record it
func (this *DefaultCluster) StartSpider(spiderName string) {
this.crawlStatus.StartSpider(spiderName)
}
// pop a request from waiting quene
// add to crawling quenu
func (this *DefaultCluster) PopRequest() *http.Request {
request := this.RequestStatus.WaitingQuene.Pop()
return request
}
// record distribute request job
func (this *DefaultCluster) AddToCrawlingQuene(request *http.Request) {
requestMap, ok := this.RequestStatus.CrawlingMap[request.NodeName]
if !ok {
requestMap = make(map[string]*http.Request)
this.RequestStatus.CrawlingMap[request.NodeName] = requestMap
}
this.crawlStatus.Distribute(request.SpiderName)
requestMap[request.UniqueName] = request
}
// a request job is done
// delete it from crawling quene
// add crawled num
func (this *DefaultCluster) Crawled(scrapyResult *crawler.ScrapeResult) {
this.RequestStatus.Crawled(scrapyResult)
// change crawlStatus
this.crawlStatus.Crawled(scrapyResult.Request.SpiderName)
}
func (this *DefaultCluster) CanWeStopSpider(spiderName string) bool {
return this.crawlStatus.CanWeStop(spiderName)
}
func (this *DefaultCluster) StopSpider(spiderName string) {
spiderStatus := this.crawlStatus.CloseSpider(spiderName)
message, _ := json.Marshal(spiderStatus)
log.Println("dump", spiderName, "result")
util.DumpResult(this.settings.LogPath, spiderStatus.Name, string(message))
}
// add a request to quene
func (this *DefaultCluster) AddRequest(request *http.Request) {
this.RequestStatus.WaitingQuene.Push(request)
this.crawlStatus.Push(request.SpiderName)
}
// get master node name
func (this *DefaultCluster) GetMasterName() string {
return this.clusterInfo.MasterNode.Name
}
// is all loop stop
func (this *DefaultCluster) IsStop() bool {
return this.RequestStatus.IsStop()
}
func (this *DefaultCluster) HasNode(nodeName string) bool {
for _, node := range this.clusterInfo.NodeList {
if node.Name == nodeName {
return true
}
}
return false
}
// is the spider running
func (this *DefaultCluster) IsSpiderRunning(spiderName string) bool {
return this.crawlStatus.IsSpiderRunning(spiderName)
}
// get master node
func (this *DefaultCluster) GetMasterNode() *node.NodeInfo {
return this.clusterInfo.MasterNode
}
// is cluster ready for crawl
func (this *DefaultCluster) IsReady() bool {
return this.clusterInfo.Status == CLUSTER_STATUS_READY
}
func (this *DefaultCluster) Ready() {
this.clusterInfo.Status = CLUSTER_STATUS_READY
}
func (this *DefaultCluster) Join() {
this.clusterInfo.Status = CLUSTER_STATUS_JOIN
}