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-rw-r--r--worker/notmuch/lib/database.go232
1 files changed, 133 insertions, 99 deletions
diff --git a/worker/notmuch/lib/database.go b/worker/notmuch/lib/database.go
index 0706bbc..1b0771c 100644
--- a/worker/notmuch/lib/database.go
+++ b/worker/notmuch/lib/database.go
@@ -5,15 +5,19 @@ package lib
import (
"fmt"
"log"
+ "time"
notmuch "github.com/zenhack/go.notmuch"
)
+const MAX_DB_AGE time.Duration = 10 * time.Second
+
type DB struct {
path string
excludedTags []string
- ro *notmuch.DB
logger *log.Logger
+ lastOpenTime time.Time
+ db *notmuch.DB
}
func NewDB(path string, excludedTags []string,
@@ -27,58 +31,79 @@ func NewDB(path string, excludedTags []string,
}
func (db *DB) Connect() error {
- return db.connectRO()
+ // used as sanity check upon initial connect
+ err := db.connect(false)
+ return err
}
-// connectRW returns a writable notmuch DB, which needs to be closed to commit
-// the changes and to release the DB lock
-func (db *DB) connectRW() (*notmuch.DB, error) {
- rw, err := notmuch.Open(db.path, notmuch.DBReadWrite)
- if err != nil {
- return nil, fmt.Errorf("could not connect to notmuch db: %v", err)
+func (db *DB) close() error {
+ if db.db == nil {
+ return nil
}
- return rw, err
+ err := db.db.Close()
+ db.db = nil
+ return err
}
-// connectRO connects a RO db to the worker
-func (db *DB) connectRO() error {
- if db.ro != nil {
- if err := db.ro.Close(); err != nil {
- db.logger.Printf("connectRO: could not close the old db: %v", err)
- }
+func (db *DB) connect(writable bool) error {
+ var mode notmuch.DBMode = notmuch.DBReadOnly
+ if writable {
+ mode = notmuch.DBReadWrite
}
var err error
- db.ro, err = notmuch.Open(db.path, notmuch.DBReadOnly)
+ db.db, err = notmuch.Open(db.path, mode)
if err != nil {
return fmt.Errorf("could not connect to notmuch db: %v", err)
}
+ db.lastOpenTime = time.Now()
return nil
}
-// ListTags lists all known tags
-func (db *DB) ListTags() ([]string, error) {
- if db.ro == nil {
- return nil, fmt.Errorf("not connected to the notmuch db")
+//withConnection calls callback on the DB object, cleaning up upon return.
+//the error returned is from the connection attempt, if not successful,
+//or from the callback otherwise.
+func (db *DB) withConnection(writable bool, cb func(*notmuch.DB) error) error {
+ too_old := time.Now().After(db.lastOpenTime.Add(MAX_DB_AGE))
+ if db.db == nil || writable || too_old {
+ if cerr := db.close(); cerr != nil {
+ db.logger.Printf("failed to close the notmuch db: %v", cerr)
+ }
+ err := db.connect(writable)
+ if err != nil {
+ return err
+ }
}
- tags, err := db.ro.Tags()
- if err != nil {
- return nil, err
+ err := cb(db.db)
+ if writable {
+ // we need to close to commit the changes, else we block others
+ if cerr := db.close(); cerr != nil {
+ db.logger.Printf("failed to close the notmuch db: %v", cerr)
+ }
}
+ return err
+}
+
+// ListTags lists all known tags
+func (db *DB) ListTags() ([]string, error) {
var result []string
- var tag *notmuch.Tag
- for tags.Next(&tag) {
- result = append(result, tag.Value)
- }
- return result, nil
+ err := db.withConnection(false, func(ndb *notmuch.DB) error {
+ tags, err := ndb.Tags()
+ if err != nil {
+ return err
+ }
+ var tag *notmuch.Tag
+ for tags.Next(&tag) {
+ result = append(result, tag.Value)
+ }
+ return nil
+ })
+ return result, err
}
//getQuery returns a query based on the provided query string.
//It also configures the query as specified on the worker
-func (db *DB) newQuery(query string) (*notmuch.Query, error) {
- if db.ro == nil {
- return nil, fmt.Errorf("not connected to the notmuch db")
- }
- q := db.ro.NewQuery(query)
+func (db *DB) newQuery(ndb *notmuch.DB, query string) (*notmuch.Query, error) {
+ q := ndb.NewQuery(query)
q.SetExcludeScheme(notmuch.EXCLUDE_TRUE)
q.SetSortScheme(notmuch.SORT_OLDEST_FIRST)
for _, t := range db.excludedTags {
@@ -91,23 +116,23 @@ func (db *DB) newQuery(query string) (*notmuch.Query, error) {
}
func (db *DB) MsgIDsFromQuery(q string) ([]string, error) {
- if db.ro == nil {
- return nil, fmt.Errorf("not connected to the notmuch db")
- }
- query, err := db.newQuery(q)
- if err != nil {
- return nil, err
- }
- msgs, err := query.Messages()
- if err != nil {
- return nil, err
- }
- var msg *notmuch.Message
var msgIDs []string
- for msgs.Next(&msg) {
- msgIDs = append(msgIDs, msg.ID())
- }
- return msgIDs, nil
+ err := db.withConnection(false, func(ndb *notmuch.DB) error {
+ query, err := db.newQuery(ndb, q)
+ if err != nil {
+ return err
+ }
+ msgs, err := query.Messages()
+ if err != nil {
+ return err
+ }
+ var msg *notmuch.Message
+ for msgs.Next(&msg) {
+ msgIDs = append(msgIDs, msg.ID())
+ }
+ return nil
+ })
+ return msgIDs, err
}
type MessageCount struct {
@@ -116,71 +141,80 @@ type MessageCount struct {
}
func (db *DB) QueryCountMessages(q string) (MessageCount, error) {
- query, err := db.newQuery(q)
- if err != nil {
- return MessageCount{}, err
- }
- exists := query.CountMessages()
- query.Close()
- uq, err := db.newQuery(fmt.Sprintf("(%v) and (tag:unread)", q))
- if err != nil {
- return MessageCount{}, err
- }
- defer uq.Close()
- unread := uq.CountMessages()
+ var (
+ exists int
+ unread int
+ )
+ err := db.withConnection(false, func(ndb *notmuch.DB) error {
+ query, err := db.newQuery(ndb, q)
+ if err != nil {
+ return err
+ }
+ exists = query.CountMessages()
+ query.Close()
+ uq, err := db.newQuery(ndb, fmt.Sprintf("(%v) and (tag:unread)", q))
+ if err != nil {
+ return err
+ }
+ defer uq.Close()
+ unread = uq.CountMessages()
+ return nil
+ })
return MessageCount{
Exists: exists,
Unread: unread,
- }, nil
+ }, err
}
func (db *DB) MsgFilename(key string) (string, error) {
- msg, err := db.ro.FindMessage(key)
- if err != nil {
- return "", err
- }
- defer msg.Close()
- return msg.Filename(), nil
+ var filename string
+ err := db.withConnection(false, func(ndb *notmuch.DB) error {
+ msg, err := ndb.FindMessage(key)
+ if err != nil {
+ return err
+ }
+ defer msg.Close()
+ filename = msg.Filename()
+ return nil
+ })
+ return filename, err
}
func (db *DB) MsgTags(key string) ([]string, error) {
- msg, err := db.ro.FindMessage(key)
- if err != nil {
- return nil, err
- }
- defer msg.Close()
- ts := msg.Tags()
var tags []string
- var tag *notmuch.Tag
- for ts.Next(&tag) {
- tags = append(tags, tag.Value)
- }
- return tags, nil
+ err := db.withConnection(false, func(ndb *notmuch.DB) error {
+ msg, err := ndb.FindMessage(key)
+ if err != nil {
+ return err
+ }
+ defer msg.Close()
+ ts := msg.Tags()
+ var tag *notmuch.Tag
+ for ts.Next(&tag) {
+ tags = append(tags, tag.Value)
+ }
+ return nil
+ })
+ return tags, err
}
func (db *DB) msgModify(key string,
cb func(*notmuch.Message) error) error {
- defer db.connectRO()
- db.ro.Close()
-
- rw, err := db.connectRW()
- if err != nil {
- return err
- }
- defer rw.Close()
-
- msg, err := rw.FindMessage(key)
- if err != nil {
- return err
- }
- defer msg.Close()
+ err := db.withConnection(true, func(ndb *notmuch.DB) error {
+ msg, err := ndb.FindMessage(key)
+ if err != nil {
+ return err
+ }
+ defer msg.Close()
- cb(msg)
- err = msg.TagsToMaildirFlags()
- if err != nil {
- db.logger.Printf("could not sync maildir flags: %v", err)
- }
- return nil
+ cb(msg)
+ err = msg.TagsToMaildirFlags()
+ if err != nil {
+ db.logger.Printf("could not sync maildir flags: %v", err)
+ }
+ return nil
+ })
+ return err
}
func (db *DB) MsgModifyTags(key string, add, remove []string) error {
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 14:51:37 +0000