mirror of
https://github.com/TeaOSLab/EdgeNode.git
synced 2025-11-02 22:10:25 +08:00
755 lines
21 KiB
Go
755 lines
21 KiB
Go
package nodes
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import (
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"bytes"
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"errors"
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"github.com/TeaOSLab/EdgeCommon/pkg/configutils"
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"github.com/TeaOSLab/EdgeNode/internal/caches"
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"github.com/TeaOSLab/EdgeNode/internal/compressions"
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"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
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"github.com/TeaOSLab/EdgeNode/internal/utils"
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"github.com/TeaOSLab/EdgeNode/internal/utils/fasttime"
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rangeutils "github.com/TeaOSLab/EdgeNode/internal/utils/ranges"
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"github.com/iwind/TeaGo/types"
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"io"
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"net/http"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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)
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// 读取缓存
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func (this *HTTPRequest) doCacheRead(useStale bool) (shouldStop bool) {
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// 需要动态Upgrade的不缓存
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if len(this.RawReq.Header.Get("Upgrade")) > 0 {
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return
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}
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this.cacheCanTryStale = false
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var cachePolicy = this.ReqServer.HTTPCachePolicy
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if cachePolicy == nil || !cachePolicy.IsOn {
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return
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}
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if this.web.Cache == nil || !this.web.Cache.IsOn || (len(cachePolicy.CacheRefs) == 0 && len(this.web.Cache.CacheRefs) == 0) {
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return
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}
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// 添加 X-Cache Header
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var addStatusHeader = this.web.Cache.AddStatusHeader
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var cacheBypassDescription = ""
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if addStatusHeader {
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defer func() {
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if len(cacheBypassDescription) > 0 {
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this.writer.Header().Set("X-Cache", cacheBypassDescription)
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return
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}
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var cacheStatus = this.varMapping["cache.status"]
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if cacheStatus != "HIT" {
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this.writer.Header().Set("X-Cache", cacheStatus)
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}
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}()
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}
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// 检查服务独立的缓存条件
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var refType = ""
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for _, cacheRef := range this.web.Cache.CacheRefs {
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if !cacheRef.IsOn {
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continue
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}
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if (cacheRef.Conds != nil && cacheRef.Conds.HasRequestConds() && cacheRef.Conds.MatchRequest(this.Format)) ||
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(cacheRef.SimpleCond != nil && cacheRef.SimpleCond.Match(this.Format)) {
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if cacheRef.IsReverse {
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return
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}
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this.cacheRef = cacheRef
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refType = "server"
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break
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}
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}
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if this.cacheRef == nil && !this.web.Cache.DisablePolicyRefs {
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// 检查策略默认的缓存条件
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for _, cacheRef := range cachePolicy.CacheRefs {
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if !cacheRef.IsOn {
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continue
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}
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if (cacheRef.Conds != nil && cacheRef.Conds.HasRequestConds() && cacheRef.Conds.MatchRequest(this.Format)) ||
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(cacheRef.SimpleCond != nil && cacheRef.SimpleCond.Match(this.Format)) {
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if cacheRef.IsReverse {
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return
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}
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this.cacheRef = cacheRef
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refType = "policy"
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break
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}
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}
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}
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if this.cacheRef == nil {
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return
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}
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// 是否强制Range回源
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if this.cacheRef.AlwaysForwardRangeRequest && len(this.RawReq.Header.Get("Range")) > 0 {
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this.cacheRef = nil
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cacheBypassDescription = "BYPASS, forward range"
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return
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}
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// 是否正在Purge
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var isPurging = this.web.Cache.PurgeIsOn && strings.ToUpper(this.RawReq.Method) == "PURGE" && this.RawReq.Header.Get("X-Edge-Purge-Key") == this.web.Cache.PurgeKey
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if isPurging {
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this.RawReq.Method = http.MethodGet
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}
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// 校验请求
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if !this.cacheRef.MatchRequest(this.RawReq) {
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this.cacheRef = nil
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cacheBypassDescription = "BYPASS, not match"
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return
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}
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// 相关变量
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this.varMapping["cache.policy.name"] = cachePolicy.Name
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this.varMapping["cache.policy.id"] = strconv.FormatInt(cachePolicy.Id, 10)
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this.varMapping["cache.policy.type"] = cachePolicy.Type
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// Cache-Pragma
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if this.cacheRef.EnableRequestCachePragma {
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if this.RawReq.Header.Get("Cache-Control") == "no-cache" || this.RawReq.Header.Get("Pragma") == "no-cache" {
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this.cacheRef = nil
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cacheBypassDescription = "BYPASS, Cache-Control or Pragma"
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return
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}
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}
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// TODO 支持Vary Header
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// 缓存标签
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var tags = []string{}
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// 检查是否有缓存
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var key string
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if this.web.Cache.Key != nil && this.web.Cache.Key.IsOn && len(this.web.Cache.Key.Host) > 0 {
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key = configutils.ParseVariables(this.cacheRef.Key, func(varName string) (value string) {
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switch varName {
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case "scheme":
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return this.web.Cache.Key.Scheme
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case "host":
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return this.web.Cache.Key.Host
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default:
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return this.Format("${" + varName + "}")
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}
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})
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} else {
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key = this.Format(this.cacheRef.Key)
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}
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if len(key) == 0 {
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this.cacheRef = nil
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cacheBypassDescription = "BYPASS, empty key"
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return
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}
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var method = this.Method()
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if method != http.MethodGet {
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key += caches.SuffixMethod + method
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tags = append(tags, strings.ToLower(method))
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}
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this.cacheKey = key
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this.varMapping["cache.key"] = key
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// 读取缓存
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var storage = caches.SharedManager.FindStorageWithPolicy(cachePolicy.Id)
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if storage == nil {
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this.cacheRef = nil
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cacheBypassDescription = "BYPASS, no policy found"
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return
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}
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this.writer.cacheStorage = storage
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// 如果正在预热，则不读取缓存，等待下一个步骤重新生成
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if (strings.HasPrefix(this.RawReq.RemoteAddr, "127.") || strings.HasPrefix(this.RawReq.RemoteAddr, "[::1]")) && this.RawReq.Header.Get("X-Edge-Cache-Action") == "fetch" {
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return
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}
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// 判断是否在Purge
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if isPurging {
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this.varMapping["cache.status"] = "PURGE"
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var subKeys = []string{
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key,
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key + caches.SuffixMethod + "HEAD",
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key + caches.SuffixWebP,
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key + caches.SuffixPartial,
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}
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// TODO 根据实际缓存的内容进行组合
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for _, encoding := range compressions.AllEncodings() {
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subKeys = append(subKeys, key+caches.SuffixCompression+encoding)
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subKeys = append(subKeys, key+caches.SuffixWebP+caches.SuffixCompression+encoding)
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}
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for _, subKey := range subKeys {
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err := storage.Delete(subKey)
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if err != nil {
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remotelogs.ErrorServer("HTTP_REQUEST_CACHE", "purge failed: "+err.Error())
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}
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}
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// 通过API节点清除别节点上的的Key
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SharedHTTPCacheTaskManager.PushTaskKeys([]string{key})
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return true
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}
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// 调用回调
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this.onRequest()
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if this.writer.isFinished {
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return
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}
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var reader caches.Reader
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var err error
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var rangeHeader = this.RawReq.Header.Get("Range")
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var isPartialRequest = len(rangeHeader) > 0
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// 检查是否支持WebP
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var webPIsEnabled = false
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var isHeadMethod = method == http.MethodHead
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if !isPartialRequest &&
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!isHeadMethod &&
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this.web.WebP != nil &&
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this.web.WebP.IsOn &&
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this.web.WebP.MatchRequest(filepath.Ext(this.Path()), this.Format) &&
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this.web.WebP.MatchAccept(this.RawReq.Header.Get("Accept")) {
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webPIsEnabled = true
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}
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// 检查WebP压缩缓存
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if webPIsEnabled && !isPartialRequest && !isHeadMethod && reader == nil {
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if this.web.Compression != nil && this.web.Compression.IsOn {
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_, encoding, ok := this.web.Compression.MatchAcceptEncoding(this.RawReq.Header.Get("Accept-Encoding"))
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if ok {
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reader, err = storage.OpenReader(key+caches.SuffixWebP+caches.SuffixCompression+encoding, useStale, false)
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if err != nil && caches.IsBusyError(err) {
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this.varMapping["cache.status"] = "BUSY"
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this.cacheRef = nil
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return
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}
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if reader != nil {
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tags = append(tags, "webp", encoding)
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}
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}
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}
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}
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// 检查WebP
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if webPIsEnabled && !isPartialRequest &&
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!isHeadMethod &&
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reader == nil {
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reader, err = storage.OpenReader(key+caches.SuffixWebP, useStale, false)
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if err != nil && caches.IsBusyError(err) {
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this.varMapping["cache.status"] = "BUSY"
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this.cacheRef = nil
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return
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}
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if reader != nil {
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this.writer.cacheReaderSuffix = caches.SuffixWebP
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tags = append(tags, "webp")
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}
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}
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// 检查普通压缩缓存
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if !isPartialRequest && !isHeadMethod && reader == nil {
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if this.web.Compression != nil && this.web.Compression.IsOn {
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_, encoding, ok := this.web.Compression.MatchAcceptEncoding(this.RawReq.Header.Get("Accept-Encoding"))
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if ok {
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reader, err = storage.OpenReader(key+caches.SuffixCompression+encoding, useStale, false)
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if err != nil && caches.IsBusyError(err) {
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this.varMapping["cache.status"] = "BUSY"
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this.cacheRef = nil
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return
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}
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if reader != nil {
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tags = append(tags, encoding)
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}
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}
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}
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}
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// 检查正常的文件
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var isPartialCache = false
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var partialRanges []rangeutils.Range
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var firstRangeEnd int64
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if reader == nil {
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reader, err = storage.OpenReader(key, useStale, false)
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if err != nil && caches.IsBusyError(err) {
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this.varMapping["cache.status"] = "BUSY"
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this.cacheRef = nil
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return
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}
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if err != nil && this.cacheRef.AllowPartialContent {
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// 尝试读取分片的缓存内容
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if len(rangeHeader) == 0 && this.cacheRef.ForcePartialContent {
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// 默认读取开头
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rangeHeader = "bytes=0-"
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}
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if len(rangeHeader) > 0 {
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pReader, ranges, rangeEnd, goNext := this.tryPartialReader(storage, key, useStale, rangeHeader, this.cacheRef.ForcePartialContent)
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if !goNext {
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this.cacheRef = nil
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return
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}
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if pReader != nil {
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isPartialCache = true
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reader = pReader
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partialRanges = ranges
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firstRangeEnd = rangeEnd
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err = nil
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}
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}
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}
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if err != nil {
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if errors.Is(err, caches.ErrNotFound) {
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// 移除请求中的 If-None-Match 和 If-Modified-Since，防止源站返回304而无法缓存
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if this.reverseProxy != nil {
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this.RawReq.Header.Del("If-None-Match")
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this.RawReq.Header.Del("If-Modified-Since")
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}
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// cache相关变量
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this.varMapping["cache.status"] = "MISS"
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if !useStale && this.web.Cache.Stale != nil && this.web.Cache.Stale.IsOn {
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this.cacheCanTryStale = true
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}
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return
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}
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if !this.canIgnore(err) {
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remotelogs.WarnServer("HTTP_REQUEST_CACHE", this.URL()+": read from cache failed: open cache failed: "+err.Error())
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}
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return
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}
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}
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defer func() {
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if !this.writer.DelayRead() {
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_ = reader.Close()
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}
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}()
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if useStale {
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this.varMapping["cache.status"] = "STALE"
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this.logAttrs["cache.status"] = "STALE"
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} else {
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this.varMapping["cache.status"] = "HIT"
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this.logAttrs["cache.status"] = "HIT"
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}
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// 准备Buffer
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var fileSize = reader.BodySize()
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var totalSizeString = types.String(fileSize)
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if isPartialCache {
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fileSize = reader.(*caches.PartialFileReader).MaxLength()
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if totalSizeString == "0" {
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totalSizeString = "*"
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}
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}
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// 读取Header
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var headerData = []byte{}
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this.writer.SetSentHeaderBytes(reader.HeaderSize())
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var headerPool = this.bytePool(reader.HeaderSize())
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var headerBuf = headerPool.Get()
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err = reader.ReadHeader(headerBuf.Bytes, func(n int) (goNext bool, readErr error) {
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headerData = append(headerData, headerBuf.Bytes[:n]...)
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for {
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var nIndex = bytes.Index(headerData, []byte{'\n'})
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if nIndex >= 0 {
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var row = headerData[:nIndex]
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var spaceIndex = bytes.Index(row, []byte{':'})
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if spaceIndex <= 0 {
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return false, errors.New("invalid header '" + string(row) + "'")
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}
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this.writer.Header().Set(string(row[:spaceIndex]), string(row[spaceIndex+1:]))
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headerData = headerData[nIndex+1:]
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} else {
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break
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}
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}
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return true, nil
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})
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headerPool.Put(headerBuf)
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if err != nil {
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if !this.canIgnore(err) {
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remotelogs.WarnServer("HTTP_REQUEST_CACHE", this.URL()+": read from cache failed: read header failed: "+err.Error())
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}
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return
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}
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// 设置cache.age变量
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var age = strconv.FormatInt(fasttime.Now().Unix()-reader.LastModified(), 10)
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this.varMapping["cache.age"] = age
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if addStatusHeader {
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if useStale {
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this.writer.Header().Set("X-Cache", "STALE, "+refType+", "+reader.TypeName())
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} else {
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this.writer.Header().Set("X-Cache", "HIT, "+refType+", "+reader.TypeName())
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}
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} else {
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this.writer.Header().Del("X-Cache")
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}
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if this.web.Cache.AddAgeHeader {
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this.writer.Header().Set("Age", age)
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}
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// ETag
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var respHeader = this.writer.Header()
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var eTag = respHeader.Get("ETag")
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var lastModifiedAt = reader.LastModified()
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if len(eTag) == 0 {
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if lastModifiedAt > 0 {
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if len(tags) > 0 {
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eTag = "\"" + strconv.FormatInt(lastModifiedAt, 10) + "_" + strings.Join(tags, "_") + "\""
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} else {
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eTag = "\"" + strconv.FormatInt(lastModifiedAt, 10) + "\""
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}
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respHeader.Del("Etag")
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if !isPartialCache {
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respHeader["ETag"] = []string{eTag}
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}
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}
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}
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// 支持 Last-Modified
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var modifiedTime = ""
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if lastModifiedAt > 0 {
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modifiedTime = time.Unix(utils.GMTUnixTime(lastModifiedAt), 0).Format("Mon, 02 Jan 2006 15:04:05") + " GMT"
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if !isPartialCache {
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respHeader.Set("Last-Modified", modifiedTime)
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}
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}
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// 支持 If-None-Match
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if !this.isLnRequest && !isPartialCache && len(eTag) > 0 && this.requestHeader("If-None-Match") == eTag {
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// 自定义Header
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this.ProcessResponseHeaders(this.writer.Header(), http.StatusNotModified)
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this.addExpiresHeader(reader.ExpiresAt())
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this.writer.WriteHeader(http.StatusNotModified)
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this.isCached = true
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this.cacheRef = nil
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this.writer.SetOk()
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return true
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}
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// 支持 If-Modified-Since
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if !this.isLnRequest && !isPartialCache && len(modifiedTime) > 0 && this.requestHeader("If-Modified-Since") == modifiedTime {
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// 自定义Header
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this.ProcessResponseHeaders(this.writer.Header(), http.StatusNotModified)
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this.addExpiresHeader(reader.ExpiresAt())
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this.writer.WriteHeader(http.StatusNotModified)
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this.isCached = true
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this.cacheRef = nil
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this.writer.SetOk()
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return true
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}
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this.ProcessResponseHeaders(this.writer.Header(), reader.Status())
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this.addExpiresHeader(reader.ExpiresAt())
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// 返回上级节点过期时间
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if this.isLnRequest {
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respHeader.Set(LNExpiresHeader, types.String(reader.ExpiresAt()))
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}
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// 输出Body
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if this.RawReq.Method == http.MethodHead {
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this.writer.WriteHeader(reader.Status())
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} else {
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ifRangeHeaders, ok := this.RawReq.Header["If-Range"]
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var supportRange = true
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if ok {
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supportRange = false
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for _, v := range ifRangeHeaders {
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if v == this.writer.Header().Get("ETag") || v == this.writer.Header().Get("Last-Modified") {
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supportRange = true
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break
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}
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}
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}
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// 支持Range
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var ranges = partialRanges
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if supportRange {
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if len(rangeHeader) > 0 {
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if fileSize == 0 {
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this.ProcessResponseHeaders(this.writer.Header(), http.StatusRequestedRangeNotSatisfiable)
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this.writer.WriteHeader(http.StatusRequestedRangeNotSatisfiable)
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return true
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}
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if len(ranges) == 0 {
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ranges, ok = httpRequestParseRangeHeader(rangeHeader)
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if !ok {
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this.ProcessResponseHeaders(this.writer.Header(), http.StatusRequestedRangeNotSatisfiable)
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this.writer.WriteHeader(http.StatusRequestedRangeNotSatisfiable)
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return true
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}
|
||
}
|
||
if len(ranges) > 0 {
|
||
for k, r := range ranges {
|
||
r2, ok := r.Convert(fileSize)
|
||
if !ok {
|
||
this.ProcessResponseHeaders(this.writer.Header(), http.StatusRequestedRangeNotSatisfiable)
|
||
this.writer.WriteHeader(http.StatusRequestedRangeNotSatisfiable)
|
||
return true
|
||
}
|
||
|
||
ranges[k] = r2
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if len(ranges) == 1 {
|
||
respHeader.Set("Content-Range", ranges[0].ComposeContentRangeHeader(totalSizeString))
|
||
respHeader.Set("Content-Length", strconv.FormatInt(ranges[0].Length(), 10))
|
||
this.writer.WriteHeader(http.StatusPartialContent)
|
||
|
||
var pool = this.bytePool(fileSize)
|
||
var bodyBuf = pool.Get()
|
||
|
||
var rangeEnd = ranges[0].End()
|
||
if firstRangeEnd > 0 {
|
||
rangeEnd = firstRangeEnd
|
||
}
|
||
|
||
err = reader.ReadBodyRange(bodyBuf.Bytes, ranges[0].Start(), rangeEnd, func(n int) (goNext bool, readErr error) {
|
||
_, readErr = this.writer.Write(bodyBuf.Bytes[:n])
|
||
if readErr != nil {
|
||
return false, errWritingToClient
|
||
}
|
||
return true, nil
|
||
})
|
||
pool.Put(bodyBuf)
|
||
if err != nil {
|
||
this.varMapping["cache.status"] = "MISS"
|
||
|
||
if errors.Is(err, caches.ErrInvalidRange) {
|
||
this.ProcessResponseHeaders(this.writer.Header(), http.StatusRequestedRangeNotSatisfiable)
|
||
this.writer.WriteHeader(http.StatusRequestedRangeNotSatisfiable)
|
||
return true
|
||
}
|
||
if !this.canIgnore(err) {
|
||
remotelogs.WarnServer("HTTP_REQUEST_CACHE", this.URL()+": read from cache failed: "+err.Error())
|
||
}
|
||
|
||
return true
|
||
}
|
||
} else if len(ranges) > 1 {
|
||
var boundary = httpRequestGenBoundary()
|
||
respHeader.Set("Content-Type", "multipart/byteranges; boundary="+boundary)
|
||
respHeader.Del("Content-Length")
|
||
var contentType = respHeader.Get("Content-Type")
|
||
|
||
this.writer.WriteHeader(http.StatusPartialContent)
|
||
|
||
for index, r := range ranges {
|
||
if index == 0 {
|
||
_, err = this.writer.WriteString("--" + boundary + "\r\n")
|
||
} else {
|
||
_, err = this.writer.WriteString("\r\n--" + boundary + "\r\n")
|
||
}
|
||
if err != nil {
|
||
// 不提示写入客户端错误
|
||
return true
|
||
}
|
||
|
||
_, err = this.writer.WriteString("Content-Range: " + r.ComposeContentRangeHeader(totalSizeString) + "\r\n")
|
||
if err != nil {
|
||
// 不提示写入客户端错误
|
||
return true
|
||
}
|
||
|
||
if len(contentType) > 0 {
|
||
_, err = this.writer.WriteString("Content-Type: " + contentType + "\r\n\r\n")
|
||
if err != nil {
|
||
// 不提示写入客户端错误
|
||
return true
|
||
}
|
||
}
|
||
|
||
var pool = this.bytePool(fileSize)
|
||
var bodyBuf = pool.Get()
|
||
err = reader.ReadBodyRange(bodyBuf.Bytes, r.Start(), r.End(), func(n int) (goNext bool, readErr error) {
|
||
_, readErr = this.writer.Write(bodyBuf.Bytes[:n])
|
||
if readErr != nil {
|
||
return false, errWritingToClient
|
||
}
|
||
return true, nil
|
||
})
|
||
pool.Put(bodyBuf)
|
||
if err != nil {
|
||
if !this.canIgnore(err) {
|
||
remotelogs.WarnServer("HTTP_REQUEST_CACHE", this.URL()+": read from cache failed: "+err.Error())
|
||
}
|
||
return true
|
||
}
|
||
}
|
||
|
||
_, err = this.writer.WriteString("\r\n--" + boundary + "--\r\n")
|
||
if err != nil {
|
||
this.varMapping["cache.status"] = "MISS"
|
||
|
||
// 不提示写入客户端错误
|
||
return true
|
||
}
|
||
} else { // 没有Range
|
||
var resp = &http.Response{
|
||
Body: reader,
|
||
ContentLength: reader.BodySize(),
|
||
}
|
||
this.writer.Prepare(resp, fileSize, reader.Status(), false)
|
||
this.writer.WriteHeader(reader.Status())
|
||
|
||
if storage.CanSendfile() {
|
||
var pool = this.bytePool(fileSize)
|
||
var bodyBuf = pool.Get()
|
||
if fp, canSendFile := this.writer.canSendfile(); canSendFile {
|
||
this.writer.sentBodyBytes, err = io.CopyBuffer(this.writer.rawWriter, fp, bodyBuf.Bytes)
|
||
} else {
|
||
_, err = io.CopyBuffer(this.writer, resp.Body, bodyBuf.Bytes)
|
||
}
|
||
pool.Put(bodyBuf)
|
||
} else {
|
||
mmapReader, isMMAPReader := reader.(*caches.MMAPFileReader)
|
||
if isMMAPReader {
|
||
_, err = mmapReader.CopyBodyTo(this.writer)
|
||
} else {
|
||
var pool = this.bytePool(fileSize)
|
||
var bodyBuf = pool.Get()
|
||
_, err = io.CopyBuffer(this.writer, resp.Body, bodyBuf.Bytes)
|
||
pool.Put(bodyBuf)
|
||
}
|
||
}
|
||
|
||
if err == io.EOF {
|
||
err = nil
|
||
}
|
||
if err != nil {
|
||
this.varMapping["cache.status"] = "MISS"
|
||
|
||
if !this.canIgnore(err) {
|
||
remotelogs.WarnServer("HTTP_REQUEST_CACHE", this.URL()+": read from cache failed: read body failed: "+err.Error())
|
||
}
|
||
return
|
||
}
|
||
}
|
||
}
|
||
|
||
this.isCached = true
|
||
this.cacheRef = nil
|
||
|
||
this.writer.SetOk()
|
||
|
||
return true
|
||
}
|
||
|
||
// 设置Expires Header
|
||
func (this *HTTPRequest) addExpiresHeader(expiresAt int64) {
|
||
if this.cacheRef.ExpiresTime != nil && this.cacheRef.ExpiresTime.IsPrior && this.cacheRef.ExpiresTime.IsOn {
|
||
if this.cacheRef.ExpiresTime.Overwrite || len(this.writer.Header().Get("Expires")) == 0 {
|
||
if this.cacheRef.ExpiresTime.AutoCalculate {
|
||
this.writer.Header().Set("Expires", time.Unix(utils.GMTUnixTime(expiresAt), 0).Format("Mon, 2 Jan 2006 15:04:05")+" GMT")
|
||
this.writer.Header().Del("Cache-Control")
|
||
} else if this.cacheRef.ExpiresTime.Duration != nil {
|
||
var duration = this.cacheRef.ExpiresTime.Duration.Duration()
|
||
if duration > 0 {
|
||
this.writer.Header().Set("Expires", utils.GMTTime(time.Now().Add(duration)).Format("Mon, 2 Jan 2006 15:04:05")+" GMT")
|
||
this.writer.Header().Del("Cache-Control")
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 尝试读取区间缓存
|
||
func (this *HTTPRequest) tryPartialReader(storage caches.StorageInterface, key string, useStale bool, rangeHeader string, forcePartialContent bool) (resultReader caches.Reader, ranges []rangeutils.Range, firstRangeEnd int64, goNext bool) {
|
||
goNext = true
|
||
|
||
// 尝试读取Partial cache
|
||
if len(rangeHeader) == 0 {
|
||
return
|
||
}
|
||
|
||
ranges, ok := httpRequestParseRangeHeader(rangeHeader)
|
||
if !ok {
|
||
return
|
||
}
|
||
|
||
pReader, pErr := storage.OpenReader(key+caches.SuffixPartial, useStale, true)
|
||
if pErr != nil {
|
||
if caches.IsBusyError(pErr) {
|
||
this.varMapping["cache.status"] = "BUSY"
|
||
goNext = false
|
||
return
|
||
}
|
||
return
|
||
}
|
||
|
||
partialReader, ok := pReader.(*caches.PartialFileReader)
|
||
if !ok {
|
||
_ = pReader.Close()
|
||
return
|
||
}
|
||
var isOk = false
|
||
defer func() {
|
||
if !isOk {
|
||
_ = pReader.Close()
|
||
}
|
||
}()
|
||
|
||
// 检查是否已下载完整
|
||
if !forcePartialContent &&
|
||
len(ranges) > 0 &&
|
||
ranges[0][1] < 0 &&
|
||
!partialReader.IsCompleted() {
|
||
if partialReader.BodySize() > 0 {
|
||
var r = ranges[0]
|
||
r2, findOk := partialReader.Ranges().FindRangeAtPosition(r.Start())
|
||
if findOk && r2.Length() >= (256<<10) /* worth reading */ {
|
||
isOk = true
|
||
ranges[0] = [2]int64{r.Start(), partialReader.BodySize() - 1} // Content-Range: bytes 0-[CONTENT_LENGTH - 1]/CONTENT_LENGTH
|
||
|
||
pReader.SetNextReader(NewHTTPRequestPartialReader(this, r2.End(), partialReader))
|
||
return pReader, ranges, r2.End() - 1 /* not include last byte */, true
|
||
}
|
||
}
|
||
return
|
||
}
|
||
|
||
// 检查范围
|
||
// 这里 **切记不要** 为末尾位置指定一个中间值，因为部分软件客户端不支持
|
||
for index, r := range ranges {
|
||
r1, ok := r.Convert(partialReader.MaxLength())
|
||
if !ok {
|
||
return
|
||
}
|
||
r2, ok := partialReader.ContainsRange(r1)
|
||
if !ok {
|
||
return
|
||
}
|
||
ranges[index] = r2
|
||
}
|
||
|
||
isOk = true
|
||
return pReader, ranges, -1, true
|
||
}
|