Opening a notmuch DB gives you a snapshot of the stage at that specific time. Prior to this, we only reopened the DB upon writing. However, if say a mail sync program like offlineimap is fetching new mail, we would never pick it up. This commit caches a db for a while, so that we don't generate too much overhead and does a reconnect cycle after that. I hardcoded a value as I don't think that having an option would be beneficial. Any write operation (meaning reading mail) anyhow flushes the DB by necessity. (we need to close to commit tag changes, which changing the read state is)
234 lines
4.9 KiB
Go
234 lines
4.9 KiB
Go
//+build notmuch
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package lib
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import (
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"fmt"
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"log"
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"time"
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notmuch "github.com/zenhack/go.notmuch"
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)
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const MAX_DB_AGE time.Duration = 10 * time.Second
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type DB struct {
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path string
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excludedTags []string
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logger *log.Logger
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lastOpenTime time.Time
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db *notmuch.DB
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}
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func NewDB(path string, excludedTags []string,
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logger *log.Logger) *DB {
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db := &DB{
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path: path,
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excludedTags: excludedTags,
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logger: logger,
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}
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return db
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}
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func (db *DB) Connect() error {
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// used as sanity check upon initial connect
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err := db.connect(false)
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return err
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}
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func (db *DB) close() error {
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if db.db == nil {
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return nil
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}
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err := db.db.Close()
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db.db = nil
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return err
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}
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func (db *DB) connect(writable bool) error {
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var mode notmuch.DBMode = notmuch.DBReadOnly
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if writable {
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mode = notmuch.DBReadWrite
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}
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var err error
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db.db, err = notmuch.Open(db.path, mode)
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if err != nil {
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return fmt.Errorf("could not connect to notmuch db: %v", err)
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}
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db.lastOpenTime = time.Now()
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return nil
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}
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//withConnection calls callback on the DB object, cleaning up upon return.
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//the error returned is from the connection attempt, if not successful,
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//or from the callback otherwise.
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func (db *DB) withConnection(writable bool, cb func(*notmuch.DB) error) error {
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too_old := time.Now().After(db.lastOpenTime.Add(MAX_DB_AGE))
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if db.db == nil || writable || too_old {
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if cerr := db.close(); cerr != nil {
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db.logger.Printf("failed to close the notmuch db: %v", cerr)
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}
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err := db.connect(writable)
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if err != nil {
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return err
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}
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}
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err := cb(db.db)
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if writable {
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// we need to close to commit the changes, else we block others
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if cerr := db.close(); cerr != nil {
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db.logger.Printf("failed to close the notmuch db: %v", cerr)
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}
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}
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return err
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}
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// ListTags lists all known tags
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func (db *DB) ListTags() ([]string, error) {
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var result []string
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err := db.withConnection(false, func(ndb *notmuch.DB) error {
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tags, err := ndb.Tags()
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if err != nil {
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return err
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}
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var tag *notmuch.Tag
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for tags.Next(&tag) {
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result = append(result, tag.Value)
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}
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return nil
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})
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return result, err
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}
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//getQuery returns a query based on the provided query string.
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//It also configures the query as specified on the worker
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func (db *DB) newQuery(ndb *notmuch.DB, query string) (*notmuch.Query, error) {
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q := ndb.NewQuery(query)
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q.SetExcludeScheme(notmuch.EXCLUDE_TRUE)
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q.SetSortScheme(notmuch.SORT_OLDEST_FIRST)
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for _, t := range db.excludedTags {
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err := q.AddTagExclude(t)
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if err != nil && err != notmuch.ErrIgnored {
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return nil, err
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}
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}
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return q, nil
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}
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func (db *DB) MsgIDsFromQuery(q string) ([]string, error) {
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var msgIDs []string
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err := db.withConnection(false, func(ndb *notmuch.DB) error {
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query, err := db.newQuery(ndb, q)
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if err != nil {
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return err
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}
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msgs, err := query.Messages()
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if err != nil {
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return err
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}
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var msg *notmuch.Message
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for msgs.Next(&msg) {
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msgIDs = append(msgIDs, msg.ID())
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}
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return nil
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})
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return msgIDs, err
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}
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type MessageCount struct {
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Exists int
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Unread int
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}
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func (db *DB) QueryCountMessages(q string) (MessageCount, error) {
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var (
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exists int
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unread int
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)
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err := db.withConnection(false, func(ndb *notmuch.DB) error {
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query, err := db.newQuery(ndb, q)
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if err != nil {
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return err
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}
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exists = query.CountMessages()
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query.Close()
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uq, err := db.newQuery(ndb, fmt.Sprintf("(%v) and (tag:unread)", q))
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if err != nil {
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return err
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}
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defer uq.Close()
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unread = uq.CountMessages()
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return nil
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})
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return MessageCount{
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Exists: exists,
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Unread: unread,
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}, err
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}
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func (db *DB) MsgFilename(key string) (string, error) {
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var filename string
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err := db.withConnection(false, func(ndb *notmuch.DB) error {
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msg, err := ndb.FindMessage(key)
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if err != nil {
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return err
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}
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defer msg.Close()
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filename = msg.Filename()
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return nil
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})
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return filename, err
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}
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func (db *DB) MsgTags(key string) ([]string, error) {
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var tags []string
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err := db.withConnection(false, func(ndb *notmuch.DB) error {
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msg, err := ndb.FindMessage(key)
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if err != nil {
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return err
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}
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defer msg.Close()
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ts := msg.Tags()
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var tag *notmuch.Tag
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for ts.Next(&tag) {
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tags = append(tags, tag.Value)
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}
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return nil
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})
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return tags, err
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}
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func (db *DB) msgModify(key string,
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cb func(*notmuch.Message) error) error {
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err := db.withConnection(true, func(ndb *notmuch.DB) error {
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msg, err := ndb.FindMessage(key)
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if err != nil {
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return err
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}
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defer msg.Close()
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cb(msg)
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err = msg.TagsToMaildirFlags()
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if err != nil {
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db.logger.Printf("could not sync maildir flags: %v", err)
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}
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return nil
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})
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return err
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}
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func (db *DB) MsgModifyTags(key string, add, remove []string) error {
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err := db.msgModify(key, func(msg *notmuch.Message) error {
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ierr := msg.Atomic(func(msg *notmuch.Message) {
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for _, t := range add {
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msg.AddTag(t)
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}
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for _, t := range remove {
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msg.RemoveTag(t)
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}
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})
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return ierr
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})
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return err
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}
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