/
file_cache.go
388 lines (340 loc) · 10.5 KB
/
file_cache.go
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package srnd
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"path/filepath"
"sync"
"time"
)
type FileCache struct {
database Database
store ArticleStore
handler http.Handler
webroot_dir string
name string
regen_threads int
attachments bool
requireCaptcha bool
prefix string
regenThreadChan chan ArticleEntry
regenGroupChan chan groupRegenRequest
regenBoardMap map[string]groupRegenRequest
regenThreadMap map[string]ArticleEntry
regenCatalogMap map[string]bool
regenBoardTicker *time.Ticker
ukkoTicker *time.Ticker
longTermTicker *time.Ticker
regenThreadTicker *time.Ticker
regenCatalogTicker *time.Ticker
regenThreadLock sync.RWMutex
regenBoardLock sync.RWMutex
regenCatalogLock sync.RWMutex
}
func (self *FileCache) DeleteBoardMarkup(group string) {
pages64 := self.database.GetGroupPageCount(group)
pages := int(pages64)
for page := 0; page < pages; page++ {
fname := self.getFilenameForBoardPage(group, page, false)
os.Remove(fname)
fname = self.getFilenameForBoardPage(group, page, true)
os.Remove(fname)
}
}
// try to delete root post's page
func (self *FileCache) DeleteThreadMarkup(root_post_id string) {
fname := self.getFilenameForThread(root_post_id, false)
os.Remove(fname)
fname = self.getFilenameForThread(root_post_id, true)
os.Remove(fname)
}
func (self *FileCache) getFilenameForThread(root_post_id string, json bool) string {
var ext string
if json {
ext = "json"
} else {
ext = "html"
}
fname := fmt.Sprintf("thread-%s.%s", HashMessageID(root_post_id), ext)
return filepath.Join(self.webroot_dir, fname)
}
func (self *FileCache) getFilenameForBoardPage(boardname string, pageno int, json bool) string {
var ext string
if json {
ext = "json"
} else {
ext = "html"
}
fname := fmt.Sprintf("%s-%d.%s", boardname, pageno, ext)
return filepath.Join(self.webroot_dir, fname)
}
func (self *FileCache) getFilenameForCatalog(boardname string) string {
fname := fmt.Sprintf("catalog-%s.html", boardname)
return filepath.Join(self.webroot_dir, fname)
}
// regen every newsgroup
func (self *FileCache) RegenAll() {
log.Println("regen all on http frontend")
// get all groups
groups := self.database.GetAllNewsgroups()
if groups != nil {
for _, group := range groups {
// send every thread for this group down the regen thread channel
go self.database.GetGroupThreads(group, self.regenThreadChan)
pages := self.database.GetGroupPageCount(group)
var pg int64
for pg = 0; pg < pages; pg++ {
self.regenGroupChan <- groupRegenRequest{group, int(pg)}
}
}
}
}
func (self *FileCache) regenLongTerm() {
wr, err := os.Create(filepath.Join(self.webroot_dir, "history.html"))
defer wr.Close()
if err != nil {
log.Println("cannot render history graph", err)
return
}
template.genGraphs(self.prefix, wr, self.database, nil)
}
func (self *FileCache) pollLongTerm() {
for {
<-self.longTermTicker.C
// regenerate long term stuff
self.regenLongTerm()
}
}
func (self *FileCache) pollRegen() {
for {
select {
// listen for regen board requests
case req := <-self.regenGroupChan:
self.regenBoardLock.Lock()
self.regenBoardMap[fmt.Sprintf("%s|%s", req.group, req.page)] = req
self.regenBoardLock.Unlock()
self.regenCatalogLock.Lock()
self.regenCatalogMap[req.group] = true
self.regenCatalogLock.Unlock()
// listen for regen thread requests
case entry := <-self.regenThreadChan:
self.regenThreadLock.Lock()
self.regenThreadMap[fmt.Sprintf("%s|%s", entry[0], entry[1])] = entry
self.regenThreadLock.Unlock()
// regen ukko
case _ = <-self.ukkoTicker.C:
self.regenUkko()
self.RegenFrontPage(0)
case _ = <-self.regenThreadTicker.C:
self.regenThreadLock.Lock()
for _, entry := range self.regenThreadMap {
self.regenerateThread(entry, false)
self.regenerateThread(entry, true)
}
self.regenThreadMap = make(map[string]ArticleEntry)
self.regenThreadLock.Unlock()
case _ = <-self.regenBoardTicker.C:
self.regenBoardLock.Lock()
for _, v := range self.regenBoardMap {
pages := self.database.GetGroupPageCount(v.group)
self.regenerateBoardPage(v.group, int(pages), v.page, false)
self.regenerateBoardPage(v.group, int(pages), v.page, true)
}
self.regenBoardMap = make(map[string]groupRegenRequest)
self.regenBoardLock.Unlock()
case _ = <-self.regenCatalogTicker.C:
self.regenCatalogLock.Lock()
for board, _ := range self.regenCatalogMap {
self.regenerateCatalog(board)
}
self.regenCatalogMap = make(map[string]bool)
self.regenCatalogLock.Unlock()
}
}
}
func (self *FileCache) InvertPagination() {
}
// regen every page of the board
func (self *FileCache) RegenerateBoard(group string) {
pages, _ := self.database.GetPagesPerBoard(group)
for page := 0; page < pages; page++ {
self.regenerateBoardPage(group, int(pages), page, false)
self.regenerateBoardPage(group, int(pages), page, true)
}
}
// regenerate just a thread page
func (self *FileCache) regenerateThread(root ArticleEntry, json bool) {
msgid := root.MessageID()
if self.store.HasArticle(msgid) {
fname := self.getFilenameForThread(msgid, json)
wr, err := os.Create(fname)
defer wr.Close()
if err != nil {
log.Println("did not write", fname, err)
return
}
template.genThread(self.attachments, self.requireCaptcha, root, self.prefix, self.name, wr, self.database, json, nil, false)
} else {
log.Println("don't have root post", msgid, "not regenerating thread")
}
}
// regenerate just a page on a board
func (self *FileCache) regenerateBoardPage(board string, pages, page int, json bool) {
fname := self.getFilenameForBoardPage(board, page, json)
wr, err := os.Create(fname)
defer wr.Close()
if err != nil {
log.Println("error generating board page", page, "for", board, err)
return
}
template.genBoardPage(self.attachments, self.requireCaptcha, self.prefix, self.name, board, pages, page, wr, self.database, json, nil, false, false)
}
// regenerate the catalog for a board
func (self *FileCache) regenerateCatalog(board string) {
fname := self.getFilenameForCatalog(board)
wr, err := os.Create(fname)
defer wr.Close()
if err != nil {
log.Println("error generating catalog for", board, err)
return
}
template.genCatalog(self.prefix, self.name, board, wr, self.database, nil, false)
}
// regenerate the front page
func (self *FileCache) RegenFrontPage(_ int) {
indexwr, err1 := os.Create(filepath.Join(self.webroot_dir, "index.html"))
defer indexwr.Close()
if err1 != nil {
log.Println("cannot render front page", err1)
return
}
boardswr, err2 := os.Create(filepath.Join(self.webroot_dir, "boards.html"))
defer boardswr.Close()
if err2 != nil {
log.Println("cannot render board list page", err2)
return
}
template.genFrontPage(10, self.prefix, self.name, indexwr, boardswr, self.database, nil)
j_boardswr, err2 := os.Create(filepath.Join(self.webroot_dir, "boards.json"))
g := self.database.GetAllNewsgroups()
err := json.NewEncoder(j_boardswr).Encode(g)
if err != nil {
log.Println("cannot render boards.json", err)
}
}
// regenerate the overboard
func (self *FileCache) regenUkko() {
// markup
fname := filepath.Join(self.webroot_dir, "ukko.html")
wr, err := os.Create(fname)
defer wr.Close()
if err != nil {
log.Println("error generating ukko markup", err)
return
}
template.genUkko(self.prefix, self.name, wr, self.database, false, nil, false, false)
// json
fname = filepath.Join(self.webroot_dir, "ukko.json")
wr, err = os.Create(fname)
defer wr.Close()
if err != nil {
log.Println("error generating ukko json", err)
return
}
template.genUkko(self.prefix, self.name, wr, self.database, true, nil, false, false)
i := 0
for i < 10 {
fname := fmt.Sprintf("ukko-%d.html", i)
jname := fmt.Sprintf("ukko-%d.json", i)
f, err := os.Create(fname)
if err != nil {
log.Println("Failed to create html ukko", i, err)
return
}
defer f.Close()
template.genUkkoPaginated(self.prefix, self.name, f, self.database, 10, i, false, nil, false, false)
j, err := os.Create(jname)
if err != nil {
log.Printf("failed to create json ukko", i, err)
return
}
defer j.Close()
template.genUkkoPaginated(self.prefix, self.name, j, self.database, 10, i, true, nil, false, false)
}
}
// regenerate pages after a mod event
func (self *FileCache) RegenOnModEvent(newsgroup, msgid, root string, page int) {
if root == msgid {
fname := self.getFilenameForThread(root, false)
os.Remove(fname)
fname = self.getFilenameForThread(root, true)
os.Remove(fname)
} else {
self.regenThreadChan <- ArticleEntry{root, newsgroup}
}
self.regenGroupChan <- groupRegenRequest{newsgroup, int(page)}
self.regenUkko()
}
func (self *FileCache) Start() {
threads := self.regen_threads
// check for invalid number of threads
if threads <= 0 {
threads = 1
}
// use N threads for regeneration
for threads > 0 {
go self.pollRegen()
threads--
}
// run long term regen jobs
go self.pollLongTerm()
}
func (self *FileCache) Regen(msg ArticleEntry) {
self.regenThreadChan <- msg
self.RegenerateBoard(msg.Newsgroup())
}
func (self *FileCache) GetThreadChan() chan ArticleEntry {
return self.regenThreadChan
}
func (self *FileCache) GetGroupChan() chan groupRegenRequest {
return self.regenGroupChan
}
func (self *FileCache) GetI18N(r *http.Request) *I18N {
return nil
}
func (self *FileCache) GetHandler() CacheHandler {
return self
}
func (self *FileCache) ServeHTTP(w http.ResponseWriter, r *http.Request) {
self.handler.ServeHTTP(w, r)
}
func (self *FileCache) Close() {
//nothig to do
}
func (self *FileCache) SetRequireCaptcha(require bool) {
self.requireCaptcha = require
}
func NewFileCache(prefix, webroot, name string, threads int, attachments bool, db Database, store ArticleStore) CacheInterface {
cache := new(FileCache)
cache.handler = http.FileServer(http.Dir(webroot))
cache.regenBoardTicker = time.NewTicker(time.Second * 10)
cache.longTermTicker = time.NewTicker(time.Hour)
cache.ukkoTicker = time.NewTicker(time.Second * 30)
cache.regenThreadTicker = time.NewTicker(time.Second)
cache.regenCatalogTicker = time.NewTicker(time.Second * 20)
cache.regenBoardMap = make(map[string]groupRegenRequest)
cache.regenThreadMap = make(map[string]ArticleEntry)
cache.regenCatalogMap = make(map[string]bool)
cache.regenThreadChan = make(chan ArticleEntry, 16)
cache.regenGroupChan = make(chan groupRegenRequest, 8)
cache.prefix = prefix
cache.webroot_dir = webroot
cache.name = name
cache.regen_threads = threads
cache.attachments = attachments
cache.database = db
cache.store = store
return cache
}