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authorReto Brunner <reto@labrat.space>2019-09-13 08:47:59 +0200
committerDrew DeVault <sir@cmpwn.com>2019-09-16 12:19:13 -0400
commit83207c1e1d00d118a2bba20d9fd178f32d7f88da (patch)
tree76072bcfd8317d40c0a65cfa8be21c20a5d145dd /worker/notmuch/lib/database.go
parentad0d6319dd751ffc7bf6b2044fc673d04f9d6029 (diff)
notmuch: extract all notmuch db operations.
For some reason the current code frequently segfaults due to an invalid C memory address. This commit mediates that by never keeping an object alive longer than absolutely necessary.
Diffstat (limited to 'worker/notmuch/lib/database.go')
-rw-r--r--worker/notmuch/lib/database.go179
1 files changed, 179 insertions, 0 deletions
diff --git a/worker/notmuch/lib/database.go b/worker/notmuch/lib/database.go
new file mode 100644
index 0000000..3398504
--- /dev/null
+++ b/worker/notmuch/lib/database.go
@@ -0,0 +1,179 @@
+//+build notmuch
+
+package lib
+
+import (
+ "fmt"
+ "log"
+
+ notmuch "github.com/zenhack/go.notmuch"
+)
+
+type DB struct {
+ path string
+ excludedTags []string
+ ro *notmuch.DB
+ logger *log.Logger
+}
+
+func NewDB(path string, excludedTags []string,
+ logger *log.Logger) *DB {
+ db := &DB{
+ path: path,
+ excludedTags: excludedTags,
+ logger: logger,
+ }
+ return db
+}
+
+func (db *DB) Connect() error {
+ return db.connectRO()
+}
+
+// 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)
+ }
+ return rw, 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)
+ }
+ }
+ var err error
+ db.ro, err = notmuch.Open(db.path, notmuch.DBReadOnly)
+ if err != nil {
+ return fmt.Errorf("could not connect to notmuch db: %v", err)
+ }
+ return nil
+}
+
+//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)
+ q.SetExcludeScheme(notmuch.EXCLUDE_TRUE)
+ q.SetSortScheme(notmuch.SORT_OLDEST_FIRST)
+ for _, t := range db.excludedTags {
+ err := q.AddTagExclude(t)
+ if err != nil && err != notmuch.ErrIgnored {
+ return nil, err
+ }
+ }
+ return q, nil
+}
+
+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
+}
+
+type MessageCount struct {
+ Exists int
+ Unread int
+}
+
+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()
+ return MessageCount{
+ Exists: exists,
+ Unread: unread,
+ }, nil
+}
+
+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
+}
+
+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
+}
+
+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()
+
+ cb(msg)
+ return nil
+}
+
+func (db *DB) MsgModifyTags(key string, add, remove []string) error {
+ err := db.msgModify(key, func(msg *notmuch.Message) error {
+ ierr := msg.Atomic(func(msg *notmuch.Message) {
+ for _, t := range add {
+ msg.AddTag(t)
+ }
+ for _, t := range remove {
+ msg.RemoveTag(t)
+ }
+ })
+ return ierr
+ })
+ return err
+}
+