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package imap
import (
"bufio"
"bytes"
"encoding/gob"
"fmt"
"os"
"path"
"time"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/types"
"github.com/emersion/go-message"
"github.com/emersion/go-message/mail"
"github.com/emersion/go-message/textproto"
"github.com/mitchellh/go-homedir"
"github.com/syndtr/goleveldb/leveldb"
)
type CachedHeader struct {
BodyStructure models.BodyStructure
Envelope models.Envelope
InternalDate time.Time
Uid uint32
Header []byte
Created time.Time
}
// initCacheDb opens (or creates) the database for the cache. One database is
// created per account
func (w *IMAPWorker) initCacheDb(acct string) {
cd, err := cacheDir()
if err != nil {
w.cache = nil
w.worker.Logger.Panicf("cache: unable to find cache directory: %v", err)
return
}
p := path.Join(cd, acct)
db, err := leveldb.OpenFile(p, nil)
if err != nil {
w.cache = nil
w.worker.Logger.Printf("cache: error opening cache db: %v", err)
return
}
w.cache = db
w.worker.Logger.Printf("cache: cache db opened: %s", p)
if w.config.cacheMaxAge.Hours() > 0 {
go w.cleanCache()
}
}
func (w *IMAPWorker) cacheHeader(mi *models.MessageInfo) {
uv := fmt.Sprintf("%d", w.selected.UidValidity)
uid := fmt.Sprintf("%d", mi.Uid)
w.worker.Logger.Printf("cache: caching header for message %s.%s", uv, uid)
hdr := bytes.NewBuffer(nil)
err := textproto.WriteHeader(hdr, mi.RFC822Headers.Header.Header)
if err != nil {
w.worker.Logger.Printf("cache: error writing header %s.%s: %v", uv, uid, err)
return
}
h := &CachedHeader{
BodyStructure: *mi.BodyStructure,
Envelope: *mi.Envelope,
InternalDate: mi.InternalDate,
Uid: mi.Uid,
Header: hdr.Bytes(),
Created: time.Now(),
}
data := bytes.NewBuffer(nil)
enc := gob.NewEncoder(data)
err = enc.Encode(h)
if err != nil {
w.worker.Logger.Printf("cache: error encoding message %s.%s: %v", uv, uid, err)
return
}
err = w.cache.Put([]byte("header."+uv+"."+uid), data.Bytes(), nil)
if err != nil {
w.worker.Logger.Printf("cache: error writing header to database for message %s.%s: %v", uv, uid, err)
return
}
}
func (w *IMAPWorker) getCachedHeaders(msg *types.FetchMessageHeaders) []uint32 {
w.worker.Logger.Println("Retrieving headers from cache")
var need, found []uint32
uv := fmt.Sprintf("%d", w.selected.UidValidity)
for _, uid := range msg.Uids {
u := fmt.Sprintf("%d", uid)
data, err := w.cache.Get([]byte("header."+uv+"."+u), nil)
if err != nil {
need = append(need, uid)
continue
}
ch := &CachedHeader{}
dec := gob.NewDecoder(bytes.NewReader(data))
err = dec.Decode(ch)
if err != nil {
w.worker.Logger.Printf("cache: error decoding cached header %s.%s: %v", uv, u, err)
need = append(need, uid)
continue
}
hr := bytes.NewReader(ch.Header)
textprotoHeader, err := textproto.ReadHeader(bufio.NewReader(hr))
if err != nil {
w.worker.Logger.Printf("cache: error reading cached header %s.%s: %v", uv, u, err)
need = append(need, uid)
continue
}
hdr := &mail.Header{Header: message.Header{Header: textprotoHeader}}
mi := &models.MessageInfo{
BodyStructure: &ch.BodyStructure,
Envelope: &ch.Envelope,
Flags: []models.Flag{models.SeenFlag}, // Always return a SEEN flag
Uid: ch.Uid,
RFC822Headers: hdr,
}
found = append(found, uid)
w.worker.Logger.Printf("cache: located cached header %s.%s", uv, u)
w.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: mi,
}, nil)
}
if len(found) > 0 {
w.worker.PostAction(&types.FetchMessageFlags{
Uids: found,
}, nil)
}
return need
}
func cacheDir() (string, error) {
dir, err := os.UserCacheDir()
if err != nil {
dir, err = homedir.Expand("~/.cache")
if err != nil {
return "", err
}
}
return path.Join(dir, "aerc"), nil
}
// cleanCache removes stale entries from the selected mailbox cachedb
func (w *IMAPWorker) cleanCache() {
start := time.Now()
var scanned, removed int
iter := w.cache.NewIterator(nil, nil)
for iter.Next() {
data := iter.Value()
ch := &CachedHeader{}
dec := gob.NewDecoder(bytes.NewReader(data))
err := dec.Decode(ch)
if err != nil {
w.worker.Logger.Printf("cache: error cleaning database %d: %v", w.selected.UidValidity, err)
continue
}
exp := ch.Created.Add(w.config.cacheMaxAge)
if exp.Before(time.Now()) {
err = w.cache.Delete(iter.Key(), nil)
if err != nil {
w.worker.Logger.Printf("cache: error cleaning database %d: %v", w.selected.UidValidity, err)
continue
}
removed = removed + 1
}
scanned = scanned + 1
}
iter.Release()
elapsed := time.Since(start)
w.worker.Logger.Printf("cache: cleaned cache, removed %d of %d entries in %f seconds", removed, scanned, elapsed.Seconds())
}
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