Captain ALM
e1e78655bd
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305 lines
9.4 KiB
Go
305 lines
9.4 KiB
Go
package pageHandler
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import (
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"golang.captainalm.com/cityuni-webserver/conf"
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"golang.captainalm.com/cityuni-webserver/pageHandler/utils"
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"io"
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"mime/multipart"
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"net/http"
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"net/textproto"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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const indexName = "index.go"
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type PageHandler struct {
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PageContentsCache map[string]*CachedPage
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PageProviders map[string]PageProvider
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pageContentsCacheRWMutex *sync.RWMutex
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RangeSupported bool
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CacheSettings conf.CacheSettingsYaml
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}
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type CachedPage struct {
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Content []byte
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ContentType string
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LastMod time.Time
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}
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func NewPageHandler(config conf.ServeYaml) *PageHandler {
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var thePCCMap map[string]*CachedPage
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var theMutex *sync.RWMutex
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if config.CacheSettings.EnableContentsCaching {
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thePCCMap = make(map[string]*CachedPage)
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theMutex = &sync.RWMutex{}
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}
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toReturn := &PageHandler{
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PageContentsCache: thePCCMap,
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pageContentsCacheRWMutex: theMutex,
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RangeSupported: config.RangeSupported,
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CacheSettings: config.CacheSettings,
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}
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if config.EnableGoInfoPage {
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toReturn.PageProviders = GetProviders(config.CacheSettings.EnableTemplateCaching, config.DataStorage, toReturn)
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} else {
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toReturn.PageProviders = GetProviders(config.CacheSettings.EnableTemplateCaching, config.DataStorage, nil)
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}
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return toReturn
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}
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func (ph *PageHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
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actualPagePath := ""
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if strings.HasSuffix(request.URL.Path, "/") {
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if strings.HasSuffix(request.URL.Path, ".go/") {
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actualPagePath = strings.TrimRight(request.URL.Path, "/")
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} else {
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actualPagePath = request.URL.Path + indexName
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}
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} else {
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actualPagePath = request.URL.Path
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}
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var currentProvider PageProvider
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canCache := false
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actualQueries := ""
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queryValues := request.URL.Query()
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var pageContent []byte
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pageContentType := ""
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var lastMod time.Time
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if currentProvider = ph.PageProviders[actualPagePath]; currentProvider != nil {
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actualQueries = currentProvider.GetCacheIDExtension(queryValues)
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if ph.CacheSettings.EnableContentsCaching {
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cached := ph.getPageFromCache(request.URL.Path, actualQueries)
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if cached != nil {
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pageContent = cached.Content
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pageContentType = cached.ContentType
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lastMod = cached.LastMod
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}
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}
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if pageContentType == "" {
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pageContentType, pageContent, canCache = currentProvider.GetContents(queryValues)
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lastMod = currentProvider.GetLastModified()
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if pageContentType != "" && canCache && ph.CacheSettings.EnableContentsCaching {
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ph.setPageToCache(request.URL.Path, actualQueries, &CachedPage{
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Content: pageContent,
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ContentType: pageContentType,
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LastMod: lastMod,
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})
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}
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}
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}
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allowedMethods := ph.getAllowedMethodsForPath(request.URL.Path)
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allowed := false
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if request.Method != http.MethodOptions {
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for _, method := range allowedMethods {
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if method == request.Method {
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allowed = true
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break
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}
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}
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}
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if allowed {
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if pageContentType == "" {
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utils.WriteResponseHeaderCanWriteBody(request.Method, writer, http.StatusNotFound, "Page Not Found")
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} else {
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switch request.Method {
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case http.MethodGet, http.MethodHead:
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writer.Header().Set("Content-Type", pageContentType)
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writer.Header().Set("Content-Length", strconv.Itoa(len(pageContent)))
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utils.SetLastModifiedHeader(writer.Header(), lastMod)
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utils.SetCacheHeaderWithAge(writer.Header(), ph.CacheSettings.MaxAge, lastMod)
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theETag := utils.GetValueForETagUsingByteArray(pageContent)
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writer.Header().Set("ETag", theETag)
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if utils.ProcessSupportedPreconditionsForNext(writer, request, lastMod, theETag, ph.CacheSettings.NotModifiedResponseUsingLastModified, ph.CacheSettings.NotModifiedResponseUsingETags) {
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httpRangeParts := utils.ProcessRangePreconditions(int64(len(pageContent)), writer, request, lastMod, theETag, ph.RangeSupported)
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if httpRangeParts != nil {
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if len(httpRangeParts) <= 1 {
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var theWriter io.Writer = writer
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if len(httpRangeParts) == 1 {
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theWriter = utils.NewPartialRangeWriter(theWriter, httpRangeParts[0])
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}
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_, _ = theWriter.Write(pageContent)
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} else {
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multWriter := multipart.NewWriter(writer)
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writer.Header().Set("Content-Type", "multipart/byteranges; boundary="+multWriter.Boundary())
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for _, currentPart := range httpRangeParts {
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mimePart, err := multWriter.CreatePart(textproto.MIMEHeader{
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"Content-Range": {currentPart.ToField(int64(len(pageContent)))},
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"Content-Type": {"text/plain; charset=utf-8"},
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})
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if err != nil {
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break
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}
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_, err = mimePart.Write(pageContent[currentPart.Start : currentPart.Start+currentPart.Length])
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if err != nil {
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break
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}
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}
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_ = multWriter.Close()
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}
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}
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}
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case http.MethodDelete:
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ph.PurgeTemplateCache(actualPagePath, request.URL.Path == "/")
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ph.PurgeContentsCache(request.URL.Path, actualQueries)
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utils.SetNeverCacheHeader(writer.Header())
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utils.WriteResponseHeaderCanWriteBody(request.Method, writer, http.StatusOK, "")
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}
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}
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} else {
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theAllowHeaderContents := ""
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for _, method := range allowedMethods {
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theAllowHeaderContents += method + ", "
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}
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writer.Header().Set("Allow", strings.TrimSuffix(theAllowHeaderContents, ", "))
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if request.Method == http.MethodOptions {
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utils.WriteResponseHeaderCanWriteBody(request.Method, writer, http.StatusOK, "")
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} else {
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utils.WriteResponseHeaderCanWriteBody(request.Method, writer, http.StatusMethodNotAllowed, "")
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}
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}
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}
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func (ph *PageHandler) PurgeContentsCache(path string, query string) {
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if ph.CacheSettings.EnableContentsCaching && ph.CacheSettings.EnableContentsCachePurge {
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if path == "/" {
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ph.pageContentsCacheRWMutex.Lock()
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ph.PageContentsCache = make(map[string]*CachedPage)
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ph.pageContentsCacheRWMutex.Unlock()
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} else {
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if strings.HasSuffix(path, ".go/") {
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ph.pageContentsCacheRWMutex.RLock()
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toDelete := make([]string, len(ph.PageContentsCache))
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theSize := 0
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for cPath := range ph.PageContentsCache {
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dPath := strings.Split(cPath, "?")[0]
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if dPath == path || dPath == path[:len(path)-1] {
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toDelete[theSize] = cPath
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theSize++
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}
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}
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ph.pageContentsCacheRWMutex.RUnlock()
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ph.pageContentsCacheRWMutex.Lock()
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for i := 0; i < theSize; i++ {
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delete(ph.PageContentsCache, toDelete[i])
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}
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ph.pageContentsCacheRWMutex.Unlock()
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return
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} else if strings.HasSuffix(path, "/") {
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path += indexName
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}
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ph.pageContentsCacheRWMutex.Lock()
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if query == "" {
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delete(ph.PageContentsCache, path)
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} else {
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delete(ph.PageContentsCache, path+"?"+query)
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}
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ph.pageContentsCacheRWMutex.Unlock()
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}
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}
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}
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func (ph *PageHandler) PurgeTemplateCache(path string, all bool) {
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if ph.CacheSettings.EnableTemplateCaching && ph.CacheSettings.EnableTemplateCachePurge {
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if all {
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for _, pageProvider := range ph.PageProviders {
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pageProvider.PurgeTemplate()
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}
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} else {
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if pageProvider, ok := ph.PageProviders[path]; ok {
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pageProvider.PurgeTemplate()
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}
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}
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}
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}
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func (ph *PageHandler) getPageFromCache(pathIn string, cleanedQueries string) *CachedPage {
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ph.pageContentsCacheRWMutex.RLock()
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defer ph.pageContentsCacheRWMutex.RUnlock()
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if strings.HasSuffix(pathIn, ".go/") {
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return ph.PageContentsCache[strings.TrimRight(pathIn, "/")]
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} else if strings.HasSuffix(pathIn, "/") {
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pathIn += indexName
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}
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if cleanedQueries == "" {
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return ph.PageContentsCache[pathIn]
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} else {
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return ph.PageContentsCache[pathIn+"?"+cleanedQueries]
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}
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}
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func (ph *PageHandler) setPageToCache(pathIn string, cleanedQueries string, newPage *CachedPage) {
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ph.pageContentsCacheRWMutex.Lock()
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defer ph.pageContentsCacheRWMutex.Unlock()
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if strings.HasSuffix(pathIn, ".go/") {
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ph.PageContentsCache[strings.TrimRight(pathIn, "/")] = newPage
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return
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} else if strings.HasSuffix(pathIn, "/") {
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pathIn += indexName
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}
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if cleanedQueries == "" {
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ph.PageContentsCache[pathIn] = newPage
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} else {
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ph.PageContentsCache[pathIn+"?"+cleanedQueries] = newPage
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}
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}
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func (ph *PageHandler) getAllowedMethodsForPath(pathIn string) []string {
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if pathIn == "/" || strings.HasSuffix(pathIn, ".go/") {
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if (ph.CacheSettings.EnableTemplateCaching && ph.CacheSettings.EnableTemplateCachePurge) ||
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(ph.CacheSettings.EnableContentsCaching && ph.CacheSettings.EnableContentsCachePurge) {
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return []string{http.MethodHead, http.MethodGet, http.MethodOptions, http.MethodDelete}
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} else {
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return []string{http.MethodHead, http.MethodGet, http.MethodOptions}
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}
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} else {
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if ph.CacheSettings.EnableContentsCaching && ph.CacheSettings.EnableContentsCachePurge {
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return []string{http.MethodHead, http.MethodGet, http.MethodOptions, http.MethodDelete}
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} else {
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return []string{http.MethodHead, http.MethodGet, http.MethodOptions}
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}
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}
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}
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func (ph *PageHandler) GetRegisteredPages() []string {
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pages := make([]string, len(ph.PageProviders))
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index := 0
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for s := range ph.PageProviders {
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pages[index] = s
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index++
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}
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return pages
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}
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func (ph *PageHandler) GetCachedPages() []string {
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ph.pageContentsCacheRWMutex.RLock()
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defer ph.pageContentsCacheRWMutex.RUnlock()
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pages := make([]string, len(ph.PageContentsCache))
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index := 0
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for s := range ph.PageContentsCache {
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pages[index] = s
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index++
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}
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return pages
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}
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func (ph *PageHandler) GetNumberOfCachedPages() int {
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ph.pageContentsCacheRWMutex.RLock()
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defer ph.pageContentsCacheRWMutex.RUnlock()
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return len(ph.PageContentsCache)
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}
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