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package svc // import "github.com/getwtxt/getwtxt/svc"
import (
"bytes"
"html/template"
"io/ioutil"
"os"
"sync"
"time"
)
// These functions and types pertain to the
// in-memory data being used by the registry
// service, such as:
// - static assets (index.html, style.css)
// - the registry itself (users, etc)
// - list of other registries submitted
// RemoteRegistries holds a list of remote registries to
// periodically scrape for new users. The remote registries
// must have been added via POST like a user.
type RemoteRegistries struct {
Mu sync.RWMutex
List []string
}
// staticAssets holda the rendered landing page
// as a byte slice, its on-disk mod time, the
// assets/style.css file as a byte slice, and
// its on-disk mod time.
type staticAssets struct {
mu sync.RWMutex
index []byte
indexMod time.Time
css []byte
cssMod time.Time
}
// Renders the landing page template using
// the info supplied in the configuration
// file's "Instance" section.
func initTemplates() *template.Template {
confObj.Mu.RLock()
assetsDir := confObj.AssetsDir
confObj.Mu.RUnlock()
return template.Must(template.ParseFiles(assetsDir + "/tmpl/index.html"))
}
func cacheUpdate() {
// This clusterfuck of mutex read locks is
// necessary to avoid deadlock. This mess
// also avoids a panic that would occur
// should twtxtCache be written to during
// this loop.
twtxtCache.Mu.RLock()
for k := range twtxtCache.Users {
twtxtCache.Mu.RUnlock()
errLog("", twtxtCache.UpdateUser(k))
twtxtCache.Mu.RLock()
}
twtxtCache.Mu.RUnlock()
remoteRegistries.Mu.RLock()
for _, v := range remoteRegistries.List {
errLog("Error refreshing local copy of remote registry data: ", twtxtCache.CrawlRemoteRegistry(v))
}
remoteRegistries.Mu.RUnlock()
}
// pingAssets checks if the local static assets
// need to be re-cached. If they do, they are
// pulled back into memory from disk.
func pingAssets() {
confObj.Mu.RLock()
assetsDir := confObj.AssetsDir
confObj.Mu.RUnlock()
cssStat, err := os.Stat(assetsDir + "/style.css")
errLog("", err)
indexStat, err := os.Stat(assetsDir + "/tmpl/index.html")
errLog("", err)
staticCache.mu.RLock()
indexMod := staticCache.indexMod
cssMod := staticCache.cssMod
staticCache.mu.RUnlock()
if !indexMod.Equal(indexStat.ModTime()) {
tmpls = initTemplates()
var b []byte
buf := bytes.NewBuffer(b)
confObj.Mu.RLock()
errLog("", tmpls.ExecuteTemplate(buf, "index.html", confObj.Instance))
confObj.Mu.RUnlock()
staticCache.mu.Lock()
staticCache.index = buf.Bytes()
staticCache.indexMod = indexStat.ModTime()
staticCache.mu.Unlock()
}
if !cssMod.Equal(cssStat.ModTime()) {
css, err := ioutil.ReadFile(assetsDir + "/style.css")
errLog("", err)
staticCache.mu.Lock()
staticCache.css = css
staticCache.cssMod = cssStat.ModTime()
staticCache.mu.Unlock()
}
}
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