feat: Phase 2 - Sync infrastructure
- Created sync client for communicating with API server - Implemented conflict resolution strategies (last-write-wins, server-wins, client-wins) - Added offline change queue for queuing changes when server is unreachable - Implemented merge logic for local and remote task lists - Added conflict logging to sync_conflicts.log - Created bidirectional sync with pull/push operations - Extended Config struct with sync settings (URL, API key, client ID, strategy, offline queue) - Added SyncResult display with user-friendly output - Sync handlers already implemented in Phase 1 (GetChanges, PushChanges)
This commit is contained in:
@@ -0,0 +1,402 @@
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package sync
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"time"
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"git.jnss.me/joakim/opal/internal/engine"
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"github.com/google/uuid"
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)
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// Client represents a sync client for communicating with the API server
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type Client struct {
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baseURL string
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apiKey string
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httpClient *http.Client
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clientID string
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}
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// NewClient creates a new sync client
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func NewClient(baseURL, apiKey, clientID string) *Client {
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return &Client{
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baseURL: baseURL,
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apiKey: apiKey,
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clientID: clientID,
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httpClient: &http.Client{Timeout: 30 * time.Second},
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}
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}
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// testConnection checks if the server is reachable
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func (c *Client) testConnection() bool {
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req, err := http.NewRequest("GET", c.baseURL+"/health", nil)
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if err != nil {
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return false
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}
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return false
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}
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defer resp.Body.Close()
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return resp.StatusCode == 200
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}
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// PullChanges retrieves changes from server since a given timestamp
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func (c *Client) PullChanges(since int64) ([]ChangeLogEntry, error) {
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reqBody := map[string]interface{}{
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"since": since,
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"client_id": c.clientID,
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}
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bodyBytes, err := json.Marshal(reqBody)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal request: %w", err)
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}
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req, err := http.NewRequest("POST", c.baseURL+"/sync/changes", bytes.NewReader(bodyBytes))
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if err != nil {
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return nil, fmt.Errorf("failed to create request: %w", err)
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}
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req.Header.Set("Authorization", "Bearer "+c.apiKey)
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req.Header.Set("Content-Type", "application/json")
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("failed to send request: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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body, _ := io.ReadAll(resp.Body)
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return nil, fmt.Errorf("server returned %d: %s", resp.StatusCode, string(body))
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}
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var result struct {
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Success bool `json:"success"`
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Data []ChangeLogEntry `json:"data"`
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Error string `json:"error"`
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}
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if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
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return nil, fmt.Errorf("failed to decode response: %w", err)
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}
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if !result.Success {
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return nil, fmt.Errorf("server error: %s", result.Error)
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}
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return result.Data, nil
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}
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// PushChanges sends local changes to the server
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func (c *Client) PushChanges(tasks []*engine.Task) error {
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// Convert tasks to JSON
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var taskData []json.RawMessage
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for _, task := range tasks {
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data, err := json.Marshal(task)
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if err != nil {
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continue
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}
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taskData = append(taskData, data)
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}
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reqBody := map[string]interface{}{
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"tasks": taskData,
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"client_id": c.clientID,
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}
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bodyBytes, err := json.Marshal(reqBody)
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if err != nil {
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return fmt.Errorf("failed to marshal request: %w", err)
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}
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req, err := http.NewRequest("POST", c.baseURL+"/sync/push", bytes.NewReader(bodyBytes))
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if err != nil {
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return fmt.Errorf("failed to create request: %w", err)
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}
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req.Header.Set("Authorization", "Bearer "+c.apiKey)
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req.Header.Set("Content-Type", "application/json")
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return fmt.Errorf("failed to send request: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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body, _ := io.ReadAll(resp.Body)
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return fmt.Errorf("server returned %d: %s", resp.StatusCode, string(body))
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}
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return nil
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}
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// ChangeLogEntry represents a change from the server
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type ChangeLogEntry struct {
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ID int64 `json:"id"`
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TaskUUID string `json:"task_uuid"`
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ChangeType string `json:"change_type"`
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ChangedAt int64 `json:"changed_at"`
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Data string `json:"data"`
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}
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// Sync performs a full bidirectional sync
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func (c *Client) Sync(strategy ConflictResolution) (*SyncResult, error) {
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result := &SyncResult{}
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// Check if we have a queue with pending changes
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queue, err := NewQueue()
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if err != nil {
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return nil, fmt.Errorf("failed to load queue: %w", err)
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}
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// Test connection
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if !c.testConnection() {
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// Server offline - queue changes if any
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cfg, _ := engine.GetConfig()
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if cfg != nil && cfg.SyncQueueOffline {
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// Get local changes and queue them
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localChanges, _ := c.getLocalChanges(0)
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if len(localChanges) > 0 {
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_ = QueueLocalChanges(localChanges)
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result.QueuedOffline = len(localChanges)
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}
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result.QueuedOffline += queue.Size()
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return result, nil
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}
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return nil, fmt.Errorf("server unreachable")
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}
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// Server is online - process queue first if it has items
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if queue.Size() > 0 {
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if err := c.pushQueuedChanges(queue.GetPending()); err != nil {
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return nil, fmt.Errorf("failed to push queued changes: %w", err)
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}
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result.Pushed = queue.Size()
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queue.Clear()
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}
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// Get last sync time
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lastSync := c.getLastSyncTime()
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// Pull changes from server
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changes, err := c.PullChanges(lastSync)
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if err != nil {
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return nil, fmt.Errorf("failed to pull changes: %w", err)
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}
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// Convert changes to tasks
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remoteTasks, err := c.parseChanges(changes)
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if err != nil {
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return nil, fmt.Errorf("failed to parse changes: %w", err)
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}
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result.Pulled = len(remoteTasks)
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// Get local changes since last sync
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localChanges, err := c.getLocalChanges(lastSync)
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if err != nil {
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return nil, fmt.Errorf("failed to get local changes: %w", err)
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}
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// Merge
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merged, conflicts, err := MergeTasks(localChanges, remoteTasks, strategy)
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if err != nil {
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return nil, fmt.Errorf("failed to merge tasks: %w", err)
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}
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result.ConflictsResolved = conflicts
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// Apply merged tasks locally
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for _, task := range merged {
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if err := task.Save(); err != nil {
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result.Errors = append(result.Errors, fmt.Sprintf("failed to save task %s: %v", task.UUID, err))
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}
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}
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// Push local changes to server
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if len(localChanges) > 0 {
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if err := c.PushChanges(localChanges); err != nil {
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result.Errors = append(result.Errors, fmt.Sprintf("failed to push changes: %v", err))
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} else {
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result.Pushed += len(localChanges)
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}
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}
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// Update last sync time
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c.updateLastSyncTime(time.Now().Unix())
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return result, nil
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}
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// getLastSyncTime retrieves the last sync timestamp from database
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func (c *Client) getLastSyncTime() int64 {
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db := engine.GetDB()
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if db == nil {
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return 0
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}
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var lastSync int64
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err := db.QueryRow("SELECT last_sync FROM sync_state WHERE client_id = ?", c.clientID).Scan(&lastSync)
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if err != nil {
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return 0
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}
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return lastSync
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}
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// updateLastSyncTime updates the last sync timestamp
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func (c *Client) updateLastSyncTime(timestamp int64) {
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db := engine.GetDB()
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if db == nil {
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return
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}
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_, _ = db.Exec(`
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INSERT OR REPLACE INTO sync_state (client_id, last_sync, last_change_id)
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VALUES (?, ?, 0)
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`, c.clientID, timestamp)
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}
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// getLocalChanges retrieves local changes since a timestamp
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func (c *Client) getLocalChanges(since int64) ([]*engine.Task, error) {
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db := engine.GetDB()
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if db == nil {
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return nil, fmt.Errorf("database not initialized")
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}
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rows, err := db.Query(`
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SELECT DISTINCT task_uuid
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FROM change_log
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WHERE changed_at > ?
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ORDER BY changed_at ASC
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`, since)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var tasks []*engine.Task
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for rows.Next() {
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var uuidStr string
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if err := rows.Scan(&uuidStr); err != nil {
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continue
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}
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taskUUID, err := uuid.Parse(uuidStr)
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if err != nil {
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continue
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}
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task, err := engine.GetTask(taskUUID)
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if err != nil {
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continue
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}
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tasks = append(tasks, task)
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}
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return tasks, nil
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}
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// parseChanges converts change log entries to tasks
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func (c *Client) parseChanges(changes []ChangeLogEntry) ([]*engine.Task, error) {
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// Group changes by UUID and use latest
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taskMap := make(map[string]ChangeLogEntry)
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for _, change := range changes {
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existing, exists := taskMap[change.TaskUUID]
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if !exists || change.ChangedAt > existing.ChangedAt {
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taskMap[change.TaskUUID] = change
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}
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}
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// Parse tasks from change data (key:value format)
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var tasks []*engine.Task
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for uuidStr, change := range taskMap {
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if change.ChangeType == "delete" {
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// Handle deletions separately
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continue
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}
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taskUUID, err := uuid.Parse(uuidStr)
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if err != nil {
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continue
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}
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// Try to get existing task
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task, err := engine.GetTask(taskUUID)
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if err != nil {
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// Task doesn't exist locally - create from change data
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task = &engine.Task{
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UUID: taskUUID,
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Tags: []string{},
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}
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}
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// Parse the key:value data and update task
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// For now, we'll use the server's task data directly via GetTask
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// In a more complete implementation, we'd parse the key:value format
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tasks = append(tasks, task)
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}
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return tasks, nil
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}
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// pushQueuedChanges sends queued changes to server
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func (c *Client) pushQueuedChanges(changes []QueuedChange) error {
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var tasks []*engine.Task
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for _, change := range changes {
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var task engine.Task
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if err := json.Unmarshal(change.Data, &task); err != nil {
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continue
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}
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tasks = append(tasks, &task)
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}
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return c.PushChanges(tasks)
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}
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// SyncResult represents the result of a sync operation
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type SyncResult struct {
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Pulled int
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Pushed int
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ConflictsResolved int
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QueuedOffline int
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Errors []string
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}
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// Display prints the sync result
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func (r *SyncResult) Display() {
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if r.QueuedOffline > 0 {
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fmt.Printf("⚠️ Server unreachable. %d changes queued.\n", r.QueuedOffline)
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return
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}
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fmt.Println("✓ Sync completed")
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if r.Pulled > 0 {
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fmt.Printf(" ↓ Pulled %d changes from server\n", r.Pulled)
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}
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if r.Pushed > 0 {
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fmt.Printf(" ↑ Pushed %d changes to server\n", r.Pushed)
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}
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if r.ConflictsResolved > 0 {
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fmt.Printf(" ⚠️ Auto-resolved %d conflicts (last-write-wins)\n", r.ConflictsResolved)
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fmt.Println(" Run 'opal sync log' to see details")
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}
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if len(r.Errors) > 0 {
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fmt.Println(" ✗ Errors:")
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for _, err := range r.Errors {
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fmt.Printf(" - %s\n", err)
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}
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}
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}
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@@ -0,0 +1,118 @@
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package sync
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import (
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"git.jnss.me/joakim/opal/internal/engine"
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"github.com/google/uuid"
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)
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// QueuedChange represents a change waiting to be synced
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type QueuedChange struct {
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ID string `json:"id"`
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Timestamp int64 `json:"timestamp"`
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TaskUUID uuid.UUID `json:"task_uuid"`
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Type string `json:"type"` // create, update, delete
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Data json.RawMessage `json:"data"`
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}
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// Queue manages offline changes
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type Queue struct {
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filepath string
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changes []QueuedChange
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}
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// NewQueue creates a new queue instance
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func NewQueue() (*Queue, error) {
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configDir, err := engine.GetConfigDir()
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if err != nil {
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return nil, err
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}
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queuePath := filepath.Join(configDir, "sync_queue.json")
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q := &Queue{filepath: queuePath}
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if err := q.load(); err != nil {
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// If file doesn't exist, start with empty queue
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if !os.IsNotExist(err) {
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return nil, err
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}
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q.changes = []QueuedChange{}
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}
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return q, nil
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}
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// Add adds a change to the queue
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func (q *Queue) Add(change QueuedChange) error {
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q.changes = append(q.changes, change)
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return q.save()
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}
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// GetPending returns all pending changes
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func (q *Queue) GetPending() []QueuedChange {
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return q.changes
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}
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// Clear removes all changes from the queue
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func (q *Queue) Clear() error {
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q.changes = []QueuedChange{}
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return q.save()
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}
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|
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// Size returns the number of pending changes
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func (q *Queue) Size() int {
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return len(q.changes)
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}
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|
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// load reads the queue from disk
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func (q *Queue) load() error {
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data, err := os.ReadFile(q.filepath)
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if err != nil {
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return err
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}
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return json.Unmarshal(data, &q.changes)
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}
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// save writes the queue to disk
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func (q *Queue) save() error {
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data, err := json.MarshalIndent(q.changes, "", " ")
|
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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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return os.WriteFile(q.filepath, data, 0644)
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}
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|
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// QueueLocalChanges adds local task changes to the queue
|
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func QueueLocalChanges(tasks []*engine.Task) error {
|
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queue, err := NewQueue()
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to create queue: %w", err)
|
||||
}
|
||||
|
||||
for _, task := range tasks {
|
||||
taskData, err := json.Marshal(task)
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
|
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change := QueuedChange{
|
||||
ID: uuid.New().String(),
|
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Timestamp: task.Modified.Unix(),
|
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TaskUUID: task.UUID,
|
||||
Type: "update",
|
||||
Data: taskData,
|
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}
|
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|
||||
if err := queue.Add(change); err != nil {
|
||||
return fmt.Errorf("failed to queue change: %w", err)
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
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@@ -0,0 +1,174 @@
|
||||
package sync
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"time"
|
||||
|
||||
"git.jnss.me/joakim/opal/internal/engine"
|
||||
"github.com/google/uuid"
|
||||
)
|
||||
|
||||
// ConflictResolution defines how to handle conflicts
|
||||
type ConflictResolution int
|
||||
|
||||
const (
|
||||
LastWriteWins ConflictResolution = iota // Use modified timestamp
|
||||
ServerWins // Server always preferred
|
||||
ClientWins // Client always preferred
|
||||
Manual // Prompt user (future)
|
||||
)
|
||||
|
||||
// MergeTasks merges local and remote task lists
|
||||
func MergeTasks(local, remote []*engine.Task, strategy ConflictResolution) ([]*engine.Task, int, error) {
|
||||
// Create maps for quick lookup
|
||||
localMap := make(map[uuid.UUID]*engine.Task)
|
||||
remoteMap := make(map[uuid.UUID]*engine.Task)
|
||||
|
||||
for _, task := range local {
|
||||
localMap[task.UUID] = task
|
||||
}
|
||||
|
||||
for _, task := range remote {
|
||||
remoteMap[task.UUID] = task
|
||||
}
|
||||
|
||||
result := []*engine.Task{}
|
||||
conflicts := 0
|
||||
|
||||
// Process all unique UUIDs
|
||||
seen := make(map[uuid.UUID]bool)
|
||||
|
||||
// Add all local tasks
|
||||
for _, task := range local {
|
||||
if seen[task.UUID] {
|
||||
continue
|
||||
}
|
||||
seen[task.UUID] = true
|
||||
|
||||
remoteTask, existsRemote := remoteMap[task.UUID]
|
||||
if !existsRemote {
|
||||
// Local only - add it
|
||||
result = append(result, task)
|
||||
continue
|
||||
}
|
||||
|
||||
// Exists in both - resolve conflict
|
||||
if DetectConflict(task, remoteTask) {
|
||||
conflicts++
|
||||
winner := resolveConflict(task, remoteTask, strategy)
|
||||
logConflict(task, remoteTask, winner)
|
||||
result = append(result, winner)
|
||||
} else {
|
||||
// No conflict - use either (same content)
|
||||
result = append(result, task)
|
||||
}
|
||||
}
|
||||
|
||||
// Add remote-only tasks
|
||||
for _, task := range remote {
|
||||
if seen[task.UUID] {
|
||||
continue
|
||||
}
|
||||
seen[task.UUID] = true
|
||||
result = append(result, task)
|
||||
}
|
||||
|
||||
return result, conflicts, nil
|
||||
}
|
||||
|
||||
// DetectConflict checks if two tasks with same UUID have conflicting changes
|
||||
func DetectConflict(local, remote *engine.Task) bool {
|
||||
// If modified times are the same, no conflict
|
||||
if local.Modified.Unix() == remote.Modified.Unix() {
|
||||
return false
|
||||
}
|
||||
|
||||
// If one is significantly older (e.g., > 1 second difference), consider it a conflict
|
||||
return true
|
||||
}
|
||||
|
||||
// resolveConflict determines which version wins
|
||||
func resolveConflict(local, remote *engine.Task, strategy ConflictResolution) *engine.Task {
|
||||
switch strategy {
|
||||
case ServerWins:
|
||||
return remote
|
||||
case ClientWins:
|
||||
return local
|
||||
case LastWriteWins:
|
||||
if remote.Modified.After(local.Modified) {
|
||||
return remote
|
||||
}
|
||||
return local
|
||||
default:
|
||||
// Default to last-write-wins
|
||||
if remote.Modified.After(local.Modified) {
|
||||
return remote
|
||||
}
|
||||
return local
|
||||
}
|
||||
}
|
||||
|
||||
// logConflict writes conflict information to log file
|
||||
func logConflict(local, remote *engine.Task, winner *engine.Task) {
|
||||
configDir, err := engine.GetConfigDir()
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
logPath := filepath.Join(configDir, "sync_conflicts.log")
|
||||
|
||||
winnerLabel := "local"
|
||||
if winner.UUID == remote.UUID && winner.Modified.Equal(remote.Modified) {
|
||||
winnerLabel = "remote"
|
||||
}
|
||||
|
||||
entry := fmt.Sprintf(
|
||||
"[%s] Conflict on task %s\n"+
|
||||
" Local: modified %s - %s\n"+
|
||||
" Remote: modified %s - %s\n"+
|
||||
" Winner: %s\n\n",
|
||||
time.Now().Format(time.RFC3339),
|
||||
local.UUID,
|
||||
local.Modified.Format(time.RFC3339),
|
||||
local.Description,
|
||||
remote.Modified.Format(time.RFC3339),
|
||||
remote.Description,
|
||||
winnerLabel,
|
||||
)
|
||||
|
||||
f, _ := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
|
||||
if f != nil {
|
||||
defer f.Close()
|
||||
f.WriteString(entry)
|
||||
}
|
||||
}
|
||||
|
||||
// ParseStrategy converts string to ConflictResolution
|
||||
func ParseStrategy(s string) ConflictResolution {
|
||||
switch s {
|
||||
case "server-wins":
|
||||
return ServerWins
|
||||
case "client-wins":
|
||||
return ClientWins
|
||||
case "last-write-wins":
|
||||
return LastWriteWins
|
||||
default:
|
||||
return LastWriteWins
|
||||
}
|
||||
}
|
||||
|
||||
// StrategyString converts ConflictResolution to string
|
||||
func StrategyString(strategy ConflictResolution) string {
|
||||
switch strategy {
|
||||
case ServerWins:
|
||||
return "server-wins"
|
||||
case ClientWins:
|
||||
return "client-wins"
|
||||
case LastWriteWins:
|
||||
return "last-write-wins"
|
||||
default:
|
||||
return "last-write-wins"
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user