errMemoryUnsettled = errors.New("a summary of the view failed, and it is tried again at the next message")
)
-// openMemory opens the chat in root and starts the builds that are ready. The
-// clock gives the dates of new messages and the days of new nodes. logger gets
-// one line for each failed build. The builds stop when ctx ends or at Close.
-func openMemory(ctx context.Context, root string, clock func() time.Time, summarizer Summarizer, logger *slog.Logger) (*Memory, error) {
- log, err := openLog(ctx, root, clock)
- if err != nil {
- return nil, err
- }
-
- m := &Memory{
- root: root,
- log: log,
- queue: newBuildQueue(),
- summarizer: summarizer,
- logger: logger,
- changed: make(chan struct{}),
- }
-
- m.ctx, m.cancel = context.WithCancel(ctx)
-
- m.syncer, err = openSyncer(root)
- if err != nil {
- return nil, errors.Join(err, m.Close())
- }
-
- m.tree, err = openTree(ctx, root, log.Len(), clock)
- if err != nil {
- return nil, errors.Join(err, m.Close())
- }
-
- err = m.load()
- if err != nil {
- return nil, errors.Join(fmt.Errorf("load view: %w", err), m.Close())
- }
-
- err = m.restoreQueue()
- if err != nil {
- return nil, errors.Join(fmt.Errorf("restore build queue: %w", err), m.Close())
- }
-
- err = m.catchUp()
- if err != nil {
- return nil, errors.Join(err, m.Close())
- }
-
- m.mutex.Lock()
- m.syncer.Written()
- m.dispatch()
- m.mutex.Unlock()
-
- return m, nil
-}
-
// Summarizer builds the text of one node with a model.
type Summarizer interface {
Summarize(ctx context.Context, task Task) (string, error)
changed chan struct{}
}
-// Close stops the builds, waits for them, makes the writes durable, closes the
-// files of the chat, and releases its lock.
-func (m *Memory) Close() error {
- m.cancel()
- m.workers.Wait()
-
- m.mutex.Lock()
- defer m.mutex.Unlock()
-
- var err error
-
- if m.syncer != nil {
- err = m.syncer.Close()
- }
-
- if m.tree != nil {
- err = errors.Join(err, m.tree.Close())
- }
-
- return errors.Join(err, m.log.Close())
-}
-
-// Append logs a new message, adds it to the tree and the views, and starts the
-// builds that are ready, also the failed ones.
-func (m *Memory) Append(kind, text string) (Message, error) {
- return m.AppendDated(kind, text, "")
+// Task is the build of the node (Level, Index). Context is the compaction view
+// for the build. Input holds the source "kind: text" of a leaf, or the two
+// child lines of a merge with their newlines as spaces. Images holds the leaf
+// image filenames and is empty for merges.
+type Task struct {
+ Level int
+ Index int
+ Context string
+ Input []string
+ Images []string
}
-// AppendDated appends a message with its RFC 3339 date and builds its nodes. An
-// empty date uses the clock, as Append does.
-func (m *Memory) AppendDated(kind, text, date string) (Message, error) {
- m.mutex.Lock()
- defer m.mutex.Unlock()
-
- return m.appendDated(kind, text, date)
+// MemoryViewFile is the content of view.json.
+type MemoryViewFile struct {
+ Chat ViewState `json:"chat"`
+ Compaction ViewState `json:"compaction"`
}
-// appendDated appends under the memory lock and updates the views and builds.
-func (m *Memory) appendDated(kind, text, date string) (Message, error) {
- message, err := m.log.AppendDated(kind, text, date)
- if err != nil {
- return Message{}, fmt.Errorf("append dated log message: %w", err)
- }
-
- defer m.syncer.Written()
-
- err = m.addMessage(message)
- if err != nil {
- return Message{}, fmt.Errorf("add dated message to memory: %w", err)
- }
-
- err = m.save()
+// openMemory opens the chat in root and starts the builds that are ready. The
+// clock gives the dates of new messages and the days of new nodes. logger gets
+// one line for each failed build. The builds stop when ctx ends or at Close.
+func openMemory(ctx context.Context, root string, clock func() time.Time, summarizer Summarizer, logger *slog.Logger) (*Memory, error) {
+ log, err := openLog(ctx, root, clock)
if err != nil {
- return Message{}, fmt.Errorf("save dated message view: %w", err)
+ return nil, fmt.Errorf("open memory log: %w", err)
}
- m.queue.Retry()
- m.dispatch()
-
- return message, nil
-}
-
-// AppendOnce appends a queued message. prepare saves its log ID before the
-// append, under the memory lock. A saved ID permits recovery after a stop
-// between that save and the append, without a second log entry. prepare must
-// not call Memory. The caller stops delivery after a failed append.
-func (m *Memory) AppendOnce(kind, text string, id *int, prepare func(int) error) (Message, error) {
- m.mutex.Lock()
- defer m.mutex.Unlock()
-
- if id != nil && *id < m.log.Len() {
- message, err := m.log.Message(*id)
- if err != nil {
- return Message{}, fmt.Errorf("read queued message: %w", err)
- }
-
- if message.Kind != kind || message.Text != text {
- return Message{}, errors.New("queued message does not match its log entry")
- }
-
- return message, nil
+ m := &Memory{
+ root: root,
+ log: log,
+ queue: newBuildQueue(),
+ summarizer: summarizer,
+ logger: logger,
+ changed: make(chan struct{}),
}
- if id != nil && *id != m.log.Len() {
- return Message{}, errors.New("queued message is beyond the log")
- }
+ m.ctx, m.cancel = context.WithCancel(ctx)
- err := prepare(m.log.Len())
+ m.syncer, err = openSyncer(root)
if err != nil {
- return Message{}, fmt.Errorf("prepare queued message: %w", err)
+ return nil, errors.Join(err, m.Close())
}
- message, err := m.appendDated(kind, text, "")
+ m.tree, err = openTree(ctx, root, log.Len(), clock)
if err != nil {
- return Message{}, fmt.Errorf("append queued message: %w", err)
- }
-
- return message, nil
-}
-
-// children reads the two children of the node key.
-func (m *Memory) children(key NodeKey) (Node, Node, error) {
- var children [2]Node
-
- for n := range children {
- child, built, err := m.tree.Node(key.level-1, 2*key.index+n)
- if err != nil {
- return Node{}, Node{}, err
- }
-
- if !built {
- return Node{}, Node{}, fmt.Errorf("node (%d, %d) is not built", key.level-1, 2*key.index+n)
- }
-
- children[n] = child
- }
-
- return children[0], children[1], nil
-}
-
-// Wait returns when no build runs. The failed builds wait for the next message.
-func (m *Memory) Wait(ctx context.Context) error {
- for {
- m.mutex.Lock()
-
- running := m.queue.Running()
- changed := m.changed
- m.mutex.Unlock()
-
- if running == 0 {
- return nil
- }
-
- select {
- case <-changed:
- case <-ctx.Done():
- return ctx.Err()
- }
+ return nil, errors.Join(err, m.Close())
}
-}
-
-// Settle returns when the chat view has no pending line, so that every message
-// so far is summarized. A pending line with no build that runs belongs to a
-// failed build, which waits for the next message, so Settle returns
-// errMemoryUnsettled in place of a wait that never ends.
-func (m *Memory) Settle(ctx context.Context) error {
- for {
- m.mutex.Lock()
- pending := m.chat.Pending()
- running := m.queue.Running()
- changed := m.changed
- m.mutex.Unlock()
-
- if !pending {
- return nil
- }
-
- if running == 0 {
- return errMemoryUnsettled
- }
-
- select {
- case <-changed:
- case <-ctx.Done():
- return ctx.Err()
- }
+ err = m.load()
+ if err != nil {
+ return nil, errors.Join(fmt.Errorf("load view: %w", err), m.Close())
}
-}
-// Flush returns when every write before the call is durable.
-func (m *Memory) Flush(ctx context.Context) error {
- return m.syncer.Flush(ctx)
-}
-
-// Snapshot flushes all memory writes and runs snapshot while no append or
-// summary write can change the log, indexes, tree, or views. snapshot must not
-// call Memory.
-func (m *Memory) Snapshot(ctx context.Context, snapshot func() error) error {
- m.mutex.Lock()
- defer m.mutex.Unlock()
-
- err := m.Flush(ctx)
+ err = m.restoreQueue()
if err != nil {
- return fmt.Errorf("flush memory snapshot: %w", err)
+ return nil, errors.Join(fmt.Errorf("restore build queue: %w", err), m.Close())
}
- err = snapshot()
+ err = m.catchUp()
if err != nil {
- return fmt.Errorf("copy memory snapshot: %w", err)
+ return nil, errors.Join(err, m.Close())
}
- return nil
-}
-
-// ViewLines returns the lines of the chat view, each with its newline, without
-// the leaf lines of the messages in skip.
-func (m *Memory) ViewLines(skip map[int]bool) []string {
m.mutex.Lock()
- defer m.mutex.Unlock()
+ m.syncer.Written()
+ m.dispatch()
+ m.mutex.Unlock()
- return m.chat.LinesWithout(skip)
+ return m, nil
}
-// Len returns the number of messages in the log.
-func (m *Memory) Len() int {
- m.mutex.Lock()
- defer m.mutex.Unlock()
-
- return m.log.Len()
-}
+// Close stops the builds, waits for them, makes the writes durable, closes the
+// files of the chat, and releases its lock.
+func (m *Memory) Close() error {
+ m.cancel()
+ m.workers.Wait()
-// Message reads the message with the given ID.
-func (m *Memory) Message(id int) (Message, error) {
m.mutex.Lock()
defer m.mutex.Unlock()
- return m.log.Message(id)
-}
+ var err error
-// Node reads the node (l, i) if it is built.
-func (m *Memory) Node(level, index int) (Node, bool, error) {
- m.mutex.Lock()
- defer m.mutex.Unlock()
+ if m.syncer != nil {
+ err = m.syncer.Close()
+ }
- return m.tree.Node(level, index)
+ if m.tree != nil {
+ err = errors.Join(err, m.tree.Close())
+ }
+
+ return errors.Join(err, m.log.Close())
}
// load reads the saved views.
for id := range m.chat.end {
built, err := m.tree.Built(0, id)
if err != nil {
- return err
+ return fmt.Errorf("check restored leaf: %w", err)
}
if built {
message, err := m.log.Message(id)
if err != nil {
- return err
+ return fmt.Errorf("read restored message: %w", err)
}
leaf, free := freeLeaf(message)
err = m.build(leaf)
if err != nil {
- return err
+ return fmt.Errorf("build restored leaf: %w", err)
}
}
keys, err := m.tree.Keys()
if err != nil {
- return err
+ return fmt.Errorf("read built nodes: %w", err)
}
for _, key := range keys {
err = m.settle(key)
if err != nil {
- return err
+ return fmt.Errorf("settle restored node: %w", err)
}
}
for m.chat.end < m.log.Len() {
message, err := m.log.Message(m.chat.end)
if err != nil {
- return err
+ return fmt.Errorf("read pending message: %w", err)
}
err = m.addMessage(message)
if err != nil {
- return err
+ return fmt.Errorf("add pending message: %w", err)
}
}
- return m.save()
+ err := m.save()
+ if err != nil {
+ return fmt.Errorf("save caught-up memory: %w", err)
+ }
+
+ return nil
}
// dispatch starts the builds that are ready, up to the limit. A build whose
}
}
-// addMessage builds the leaf of message when it needs no model call, or else
-// adds the leaf to the queue. Then it appends the leaf to the views. A crash can
-// stop an append after the leaf build and before the view save, so a leaf that
-// is built already stays as it is, and restoreQueue settles its parent.
-func (m *Memory) addMessage(message Message) error {
- built, err := m.tree.Built(0, message.ID)
- if err != nil {
- return err
- }
-
- leaf, free := freeLeaf(message)
- switch {
- case built:
- case free:
- err = m.build(leaf)
- if err != nil {
- return err
- }
- default:
- m.queue.AddLeaf(message.ID)
- }
-
- merged, err := m.chat.Append(m.tree)
- if err != nil {
- return fmt.Errorf("append to chat view: %w", err)
- }
-
- _, err = m.cview.Append(m.tree)
- if err == nil && merged {
- err = m.cview.Coarsen(m.chat, m.tree)
- }
-
- if err != nil {
- return fmt.Errorf("append to compaction view: %w", err)
- }
-
- return nil
-}
-
-// save writes the views to view.json.
-func (m *Memory) save() error {
- data, err := json.Marshal(MemoryViewFile{
- Chat: m.chat.State(),
- Compaction: m.cview.State(),
- })
- if err != nil {
- return fmt.Errorf("encode view: %w", err)
- }
-
- err = writeFileAtomic(m.viewPath(), append(data, '\n'))
- if err != nil {
- return fmt.Errorf("save view: %w", err)
- }
-
- return nil
-}
-
func (m *Memory) viewPath() string {
return filepath.Join(m.root, "view.json")
}
func (m *Memory) build(node Node) error {
err := m.tree.Add(node)
if err != nil {
- return err
+ return fmt.Errorf("add built node: %w", err)
}
m.chat.Refresh(node)
m.cview.Refresh(node)
- return m.settle(NodeKey{node.Level, node.Index})
+ err = m.settle(NodeKey{node.Level, node.Index})
+ if err != nil {
+ return fmt.Errorf("settle built node: %w", err)
+ }
+
+ return nil
}
// settle looks at the parent of the built node key when both children are
parent := NodeKey{key.level + 1, key.index / 2}
ready, err := m.ready(parent)
if err != nil || !ready {
- return err
+ if err != nil {
+ return fmt.Errorf("check parent readiness: %w", err)
+ }
+
+ return nil
}
left, right, err := m.children(parent)
if err != nil {
- return err
+ return fmt.Errorf("read parent children: %w", err)
}
node, free := freeMerge(left, right)
return nil
}
- err = m.tree.Add(node)
- if err != nil {
- return err
- }
+ err = m.tree.Add(node)
+ if err != nil {
+ return fmt.Errorf("add merged node: %w", err)
+ }
+
+ key = parent
+ }
+}
+
+// addMessage builds the leaf of message when it needs no model call, or else
+// adds the leaf to the queue. Then it appends the leaf to the views. A crash
+// can stop an append after the leaf build and before the view save, so a leaf
+// that is built already stays as it is, and restoreQueue settles its parent.
+func (m *Memory) addMessage(message Message) error {
+ built, err := m.tree.Built(0, message.ID)
+ if err != nil {
+ return fmt.Errorf("check message leaf: %w", err)
+ }
+
+ leaf, free := freeLeaf(message)
+ switch {
+ case built:
+ case free:
+ err = m.build(leaf)
+ if err != nil {
+ return fmt.Errorf("build message leaf: %w", err)
+ }
+ default:
+ m.queue.AddLeaf(message.ID)
+ }
+
+ merged, err := m.chat.Append(m.tree)
+ if err != nil {
+ return fmt.Errorf("append to chat view: %w", err)
+ }
+
+ _, err = m.cview.Append(m.tree)
+ if err == nil && merged {
+ err = m.cview.Coarsen(m.chat, m.tree)
+ }
+
+ if err != nil {
+ return fmt.Errorf("append to compaction view: %w", err)
+ }
+
+ return nil
+}
+
+// save writes the views to view.json.
+func (m *Memory) save() error {
+ data, err := json.Marshal(MemoryViewFile{
+ Chat: m.chat.State(),
+ Compaction: m.cview.State(),
+ })
+ if err != nil {
+ return fmt.Errorf("encode view: %w", err)
+ }
- key = parent
+ err = writeFileAtomic(m.viewPath(), append(data, '\n'))
+ if err != nil {
+ return fmt.Errorf("save view: %w", err)
}
+
+ return nil
}
// task returns the build task of the node key, with its input read from the log
if key.level == 0 {
message, err := m.log.Message(key.index)
if err != nil {
- return Task{}, err
+ return Task{}, fmt.Errorf("read leaf message: %w", err)
}
task.Input = []string{leafSource(message)}
left, right, err := m.children(key)
if err != nil {
- return Task{}, err
+ return Task{}, fmt.Errorf("read task children: %w", err)
}
for _, child := range []Node{left, right} {
return task, nil
}
+// failed logs the failed build of the node key with its cause err.
+func (m *Memory) failed(key NodeKey, err error) {
+ m.logger.Warn("summary failed", "level", key.level, "index", key.index, "err", err)
+}
+
// run builds one node with the summarizer. A failed build stays in the queue
// until the next message.
func (m *Memory) run(key NodeKey, task Task) {
Text: text,
Size: len(text),
})
+
m.syncer.Written()
}
m.dispatch()
}
-// failed logs the failed build of the node key with its cause err.
-func (m *Memory) failed(key NodeKey, err error) {
- m.logger.Warn("summary failed", "level", key.level, "index", key.index, "err", err)
-}
-
// ready tells if both children of the node key are built and the node is not.
func (m *Memory) ready(key NodeKey) (bool, error) {
for _, index := range []int{2 * key.index, 2*key.index + 1} {
built, err := m.tree.Built(key.level-1, index)
if err != nil || !built {
- return false, err
+ if err != nil {
+ return false, fmt.Errorf("check child readiness: %w", err)
+ }
+
+ return false, nil
}
}
built, err := m.tree.Built(key.level, key.index)
+ if err != nil {
+ return !built, fmt.Errorf("check parent readiness: %w", err)
+ }
+
+ return !built, nil
+}
+
+// children reads the two children of the node key.
+func (m *Memory) children(key NodeKey) (Node, Node, error) {
+ var children [2]Node
+
+ for n := range children {
+ child, built, err := m.tree.Node(key.level-1, 2*key.index+n)
+ if err != nil {
+ return Node{}, Node{}, fmt.Errorf("read child node: %w", err)
+ }
+
+ if !built {
+ return Node{}, Node{}, fmt.Errorf("node (%d, %d) is not built", key.level-1, 2*key.index+n)
+ }
- return !built, err
+ children[n] = child
+ }
+
+ return children[0], children[1], nil
}
func (m *Memory) context(level, index int) string {
return m.cview.Context(end)
}
+// Append logs a new message, adds it to the tree and the views, and starts the
+// builds that are ready, also the failed ones.
+func (m *Memory) Append(kind, text string) (Message, error) {
+ return m.AppendDated(kind, text, "")
+}
+
+// AppendDated appends a message with its RFC 3339 date and builds its nodes. An
+// empty date uses the clock, as Append does.
+func (m *Memory) AppendDated(kind, text, date string) (Message, error) {
+ m.mutex.Lock()
+ defer m.mutex.Unlock()
+
+ return m.appendDated(kind, text, date)
+}
+
+// appendDated appends under the memory lock and updates the views and builds.
+func (m *Memory) appendDated(kind, text, date string) (Message, error) {
+ message, err := m.log.AppendDated(kind, text, date)
+ if err != nil {
+ return Message{}, fmt.Errorf("append dated log message: %w", err)
+ }
+
+ defer m.syncer.Written()
+
+ err = m.addMessage(message)
+ if err != nil {
+ return Message{}, fmt.Errorf("add dated message to memory: %w", err)
+ }
+
+ err = m.save()
+ if err != nil {
+ return Message{}, fmt.Errorf("save dated message view: %w", err)
+ }
+
+ m.queue.Retry()
+ m.dispatch()
+
+ return message, nil
+}
+
+// AppendOnce appends a queued message. prepare saves its log ID before the
+// append, under the memory lock. A saved ID permits recovery after a stop
+// between that save and the append, without a second log entry. prepare must
+// not call Memory. The caller stops delivery after a failed append.
+func (m *Memory) AppendOnce(kind, text string, id *int, prepare func(int) error) (Message, error) {
+ m.mutex.Lock()
+ defer m.mutex.Unlock()
+
+ if id != nil && *id < m.log.Len() {
+ message, err := m.log.Message(*id)
+ if err != nil {
+ return Message{}, fmt.Errorf("read queued message: %w", err)
+ }
+
+ if message.Kind != kind || message.Text != text {
+ return Message{}, errors.New("queued message does not match its log entry")
+ }
+
+ return message, nil
+ }
+
+ if id != nil && *id != m.log.Len() {
+ return Message{}, errors.New("queued message is beyond the log")
+ }
+
+ err := prepare(m.log.Len())
+ if err != nil {
+ return Message{}, fmt.Errorf("prepare queued message: %w", err)
+ }
+
+ message, err := m.appendDated(kind, text, "")
+ if err != nil {
+ return Message{}, fmt.Errorf("append queued message: %w", err)
+ }
+
+ return message, nil
+}
+
+// Wait returns when no build runs. The failed builds wait for the next message.
+func (m *Memory) Wait(ctx context.Context) error {
+ for {
+ m.mutex.Lock()
+
+ running := m.queue.Running()
+ changed := m.changed
+ m.mutex.Unlock()
+
+ if running == 0 {
+ return nil
+ }
+
+ select {
+ case <-changed:
+ case <-ctx.Done():
+ return ctx.Err()
+ }
+ }
+}
+
+// Settle returns when the chat view has no pending line, so that every message
+// so far is summarized. A pending line with no build that runs belongs to a
+// failed build, which waits for the next message, so Settle returns
+// errMemoryUnsettled in place of a wait that never ends.
+func (m *Memory) Settle(ctx context.Context) error {
+ for {
+ m.mutex.Lock()
+
+ pending := m.chat.Pending()
+ running := m.queue.Running()
+ changed := m.changed
+ m.mutex.Unlock()
+
+ if !pending {
+ return nil
+ }
+
+ if running == 0 {
+ return errMemoryUnsettled
+ }
+
+ select {
+ case <-changed:
+ case <-ctx.Done():
+ return ctx.Err()
+ }
+ }
+}
+
+// Snapshot flushes all memory writes and runs snapshot while no append or
+// summary write can change the log, indexes, tree, or views. snapshot must not
+// call Memory.
+func (m *Memory) Snapshot(ctx context.Context, snapshot func() error) error {
+ m.mutex.Lock()
+ defer m.mutex.Unlock()
+
+ err := m.Flush(ctx)
+ if err != nil {
+ return fmt.Errorf("flush memory snapshot: %w", err)
+ }
+
+ err = snapshot()
+ if err != nil {
+ return fmt.Errorf("copy memory snapshot: %w", err)
+ }
+
+ return nil
+}
+
+// Flush returns when every write before the call is durable.
+func (m *Memory) Flush(ctx context.Context) error {
+ return m.syncer.Flush(ctx)
+}
+
+// ViewLines returns the lines of the chat view, each with its newline, without
+// the leaf lines of the messages in skip.
+func (m *Memory) ViewLines(skip map[int]bool) []string {
+ m.mutex.Lock()
+ defer m.mutex.Unlock()
+
+ return m.chat.LinesWithout(skip)
+}
+
+// Len returns the number of messages in the log.
+func (m *Memory) Len() int {
+ m.mutex.Lock()
+ defer m.mutex.Unlock()
+
+ return m.log.Len()
+}
+
+// Message reads the message with the given ID.
+func (m *Memory) Message(id int) (Message, error) {
+ m.mutex.Lock()
+ defer m.mutex.Unlock()
+
+ return m.log.Message(id)
+}
+
+// Node reads the node (l, i) if it is built.
+func (m *Memory) Node(level, index int) (Node, bool, error) {
+ m.mutex.Lock()
+ defer m.mutex.Unlock()
+
+ return m.tree.Node(level, index)
+}
+
// View returns the chat view as the model reads it.
func (m *Memory) View() string {
m.mutex.Lock()
return !free, nil
}
-
-// Task is the build of the node (Level, Index). Context is the compaction view
-// for the build. Input holds the source "kind: text" of a leaf, or the two
-// child lines of a merge with their newlines as spaces. Images holds the leaf
-// image filenames and is empty for merges.
-type Task struct {
- Level int
- Index int
- Context string
- Input []string
- Images []string
-}
-
-// MemoryViewFile is the content of view.json.
-type MemoryViewFile struct {
- Chat ViewState `json:"chat"`
- Compaction ViewState `json:"compaction"`
-}
projects / onechat / blobdiff