package lib import ( "sync" "time" "git.sr.ht/~rjarry/aerc/logging" "git.sr.ht/~rjarry/aerc/models" "git.sr.ht/~rjarry/aerc/worker/types" "github.com/gatherstars-com/jwz" ) type ThreadBuilder struct { sync.Mutex threadBlocks map[uint32]jwz.Threadable messageidToUid map[string]uint32 seen map[uint32]bool threadedUids []uint32 } func NewThreadBuilder() *ThreadBuilder { tb := &ThreadBuilder{ threadBlocks: make(map[uint32]jwz.Threadable), messageidToUid: make(map[string]uint32), seen: make(map[uint32]bool), } return tb } // Uids returns the uids in threading order func (builder *ThreadBuilder) Uids() []uint32 { builder.Lock() defer builder.Unlock() if builder.threadedUids == nil { return []uint32{} } return builder.threadedUids } // Update updates the thread builder with a new message header func (builder *ThreadBuilder) Update(msg *models.MessageInfo) { builder.Lock() defer builder.Unlock() if msg != nil { if threadable := newThreadable(msg); threadable != nil { builder.messageidToUid[threadable.MessageThreadID()] = msg.Uid builder.threadBlocks[msg.Uid] = threadable } } } // Threads returns a slice of threads for the given list of uids func (builder *ThreadBuilder) Threads(uids []uint32) []*types.Thread { builder.Lock() defer builder.Unlock() start := time.Now() threads := builder.buildAercThreads(builder.generateStructure(uids), uids) // sort threads according to uid ordering builder.sortThreads(threads, uids) // rebuild uids from threads builder.RebuildUids(threads) elapsed := time.Since(start) logging.Infof("%d threads created in %s", len(threads), elapsed) return threads } func (builder *ThreadBuilder) generateStructure(uids []uint32) jwz.Threadable { jwzThreads := make([]jwz.Threadable, 0, len(builder.threadBlocks)) for _, uid := range uids { if thr, ok := builder.threadBlocks[uid]; ok { jwzThreads = append(jwzThreads, thr) } } threader := jwz.NewThreader() threadStructure, err := threader.ThreadSlice(jwzThreads) if err != nil { logging.Errorf("failed slicing threads: %v", err) } return threadStructure } func (builder *ThreadBuilder) buildAercThreads(structure jwz.Threadable, uids []uint32) []*types.Thread { threads := make([]*types.Thread, 0, len(builder.threadBlocks)) if structure == nil { for _, uid := range uids { threads = append(threads, &types.Thread{Uid: uid}) } } else { // fill threads with nil messages for _, uid := range uids { if _, ok := builder.threadBlocks[uid]; !ok { threads = append(threads, &types.Thread{Uid: uid}) } } // append the on-the-fly created aerc threads root := &types.Thread{Uid: 0} builder.seen = make(map[uint32]bool) builder.buildTree(structure, root) for iter := root.FirstChild; iter != nil; iter = iter.NextSibling { iter.Parent = nil threads = append(threads, iter) } } return threads } // buildTree recursively translates the jwz threads structure into aerc threads // builder.seen is used to avoid potential double-counting and should be empty // on first call of this function func (builder *ThreadBuilder) buildTree(treeNode jwz.Threadable, target *types.Thread) { if treeNode == nil { return } // deal with child uid, ok := builder.messageidToUid[treeNode.MessageThreadID()] if _, seen := builder.seen[uid]; ok && !seen { builder.seen[uid] = true childNode := &types.Thread{Uid: uid, Parent: target} target.OrderedInsert(childNode) builder.buildTree(treeNode.GetChild(), childNode) } else { builder.buildTree(treeNode.GetChild(), target) } // deal with siblings for next := treeNode.GetNext(); next != nil; next = next.GetNext() { uid, ok := builder.messageidToUid[next.MessageThreadID()] if _, seen := builder.seen[uid]; ok && !seen { builder.seen[uid] = true nn := &types.Thread{Uid: uid, Parent: target} target.OrderedInsert(nn) builder.buildTree(next.GetChild(), nn) } else { builder.buildTree(next.GetChild(), target) } } } func (builder *ThreadBuilder) sortThreads(threads []*types.Thread, orderedUids []uint32) { types.SortThreadsBy(threads, orderedUids) } // RebuildUids rebuilds the uids from the given slice of threads func (builder *ThreadBuilder) RebuildUids(threads []*types.Thread) { uids := make([]uint32, 0, len(threads)) for i := len(threads) - 1; i >= 0; i-- { _ = threads[i].Walk(func(t *types.Thread, level int, currentErr error) error { uids = append(uids, t.Uid) return nil }) } // copy in reverse as msgList displays backwards for i, j := 0, len(uids)-1; i < j; i, j = i+1, j-1 { uids[i], uids[j] = uids[j], uids[i] } builder.threadedUids = uids } // threadable implements the jwz.threadable interface which is required for the // jwz threading algorithm type threadable struct { MsgInfo *models.MessageInfo MessageId string Next jwz.Threadable Parent jwz.Threadable Child jwz.Threadable Dummy bool } func newThreadable(msg *models.MessageInfo) *threadable { msgid, err := msg.MsgId() if err != nil { return nil } return &threadable{ MessageId: msgid, MsgInfo: msg, Next: nil, Parent: nil, Child: nil, Dummy: false, } } func (t *threadable) MessageThreadID() string { return t.MessageId } func (t *threadable) MessageThreadReferences() []string { if t.IsDummy() || t.MsgInfo == nil { return nil } irp, err := t.MsgInfo.InReplyTo() if err != nil { irp = "" } refs, err := t.MsgInfo.References() if err != nil || len(refs) == 0 { if irp == "" { return nil } refs = []string{irp} } return cleanRefs(t.MessageThreadID(), irp, refs) } // cleanRefs cleans up the references headers for threading // 1) message-id should not be part of the references // 2) no message-id should occur twice (avoid circularities) // 3) in-reply-to header should not be at the beginning func cleanRefs(m, irp string, refs []string) []string { considered := make(map[string]interface{}) cleanRefs := make([]string, 0, len(refs)) for _, r := range refs { if _, seen := considered[r]; r != m && !seen { considered[r] = nil cleanRefs = append(cleanRefs, r) } } if irp != "" && len(cleanRefs) > 0 { if cleanRefs[0] == irp { cleanRefs = append(cleanRefs[1:], irp) } } return cleanRefs } func (t *threadable) Subject() string { // deactivate threading by subject for now return "" } func (t *threadable) SimplifiedSubject() string { return "" } func (t *threadable) SubjectIsReply() bool { return false } func (t *threadable) SetNext(next jwz.Threadable) { t.Next = next } func (t *threadable) SetChild(kid jwz.Threadable) { t.Child = kid if kid != nil { kid.SetParent(t) } } func (t *threadable) SetParent(parent jwz.Threadable) { t.Parent = parent } func (t *threadable) GetNext() jwz.Threadable { return t.Next } func (t *threadable) GetChild() jwz.Threadable { return t.Child } func (t *threadable) GetParent() jwz.Threadable { return t.Parent } func (t *threadable) GetDate() time.Time { if t.IsDummy() { if t.GetChild() != nil { return t.GetChild().GetDate() } return time.Unix(0, 0) } if t.MsgInfo == nil || t.MsgInfo.Envelope == nil { return time.Unix(0, 0) } return t.MsgInfo.Envelope.Date } func (t *threadable) MakeDummy(forID string) jwz.Threadable { return &threadable{ MessageId: forID, Dummy: true, } } func (t *threadable) IsDummy() bool { return t.Dummy }