mirror of
https://github.com/garethgeorge/backrest.git
synced 2025-12-16 18:45:36 +00:00
597 lines
18 KiB
Go
597 lines
18 KiB
Go
package api
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import (
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"bytes"
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"context"
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"encoding/hex"
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"errors"
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"fmt"
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"os"
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"path"
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"reflect"
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"slices"
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"time"
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"connectrpc.com/connect"
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"github.com/garethgeorge/backrest/gen/go/types"
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v1 "github.com/garethgeorge/backrest/gen/go/v1"
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"github.com/garethgeorge/backrest/gen/go/v1/v1connect"
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"github.com/garethgeorge/backrest/internal/config"
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"github.com/garethgeorge/backrest/internal/oplog"
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"github.com/garethgeorge/backrest/internal/orchestrator"
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"github.com/garethgeorge/backrest/internal/orchestrator/repo"
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"github.com/garethgeorge/backrest/internal/orchestrator/tasks"
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"github.com/garethgeorge/backrest/internal/protoutil"
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"github.com/garethgeorge/backrest/internal/resticinstaller"
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"github.com/garethgeorge/backrest/internal/rotatinglog"
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"github.com/garethgeorge/backrest/pkg/restic"
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"go.uber.org/zap"
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"google.golang.org/protobuf/proto"
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"google.golang.org/protobuf/types/known/emptypb"
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)
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type BackrestHandler struct {
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v1connect.UnimplementedBackrestHandler
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config config.ConfigStore
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orchestrator *orchestrator.Orchestrator
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oplog *oplog.OpLog
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logStore *rotatinglog.RotatingLog
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}
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var _ v1connect.BackrestHandler = &BackrestHandler{}
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func NewBackrestHandler(config config.ConfigStore, orchestrator *orchestrator.Orchestrator, oplog *oplog.OpLog, logStore *rotatinglog.RotatingLog) *BackrestHandler {
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s := &BackrestHandler{
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config: config,
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orchestrator: orchestrator,
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oplog: oplog,
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logStore: logStore,
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}
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return s
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}
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// GetConfig implements GET /v1/config
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func (s *BackrestHandler) GetConfig(ctx context.Context, req *connect.Request[emptypb.Empty]) (*connect.Response[v1.Config], error) {
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config, err := s.config.Get()
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if err != nil {
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return nil, fmt.Errorf("failed to get config: %w", err)
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}
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return connect.NewResponse(config), nil
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}
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// SetConfig implements POST /v1/config
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func (s *BackrestHandler) SetConfig(ctx context.Context, req *connect.Request[v1.Config]) (*connect.Response[v1.Config], error) {
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existing, err := s.config.Get()
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if err != nil {
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return nil, fmt.Errorf("failed to check current config: %w", err)
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}
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// Compare and increment modno
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if existing.Modno != req.Msg.Modno {
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return nil, errors.New("config modno mismatch, reload and try again")
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}
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if err := config.ValidateConfig(req.Msg); err != nil {
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return nil, fmt.Errorf("validation error: %w", err)
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}
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req.Msg.Modno += 1
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if err := s.config.Update(req.Msg); err != nil {
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return nil, fmt.Errorf("failed to update config: %w", err)
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}
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newConfig, err := s.config.Get()
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if err != nil {
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return nil, fmt.Errorf("failed to get newly set config: %w", err)
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}
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if err := s.orchestrator.ApplyConfig(newConfig); err != nil {
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return nil, fmt.Errorf("failed to apply config: %w", err)
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}
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return connect.NewResponse(newConfig), nil
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}
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// AddRepo implements POST /v1/config/repo, it includes validation that the repo can be initialized.
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func (s *BackrestHandler) AddRepo(ctx context.Context, req *connect.Request[v1.Repo]) (*connect.Response[v1.Config], error) {
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c, err := s.config.Get()
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if err != nil {
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return nil, fmt.Errorf("failed to get config: %w", err)
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}
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// Deep copy the configuration
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c = proto.Clone(c).(*v1.Config)
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// Add or implicit update the repo
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if idx := slices.IndexFunc(c.Repos, func(r *v1.Repo) bool { return r.Id == req.Msg.Id }); idx != -1 {
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c.Repos[idx] = req.Msg
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} else {
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c.Repos = append(c.Repos, req.Msg)
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}
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if err := config.ValidateConfig(c); err != nil {
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return nil, fmt.Errorf("validation error: %w", err)
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}
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bin, err := resticinstaller.FindOrInstallResticBinary()
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if err != nil {
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return nil, fmt.Errorf("failed to find or install restic binary: %w", err)
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}
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r, err := repo.NewRepoOrchestrator(c, req.Msg, bin)
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if err != nil {
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return nil, fmt.Errorf("failed to configure repo: %w", err)
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}
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// use background context such that the init op can try to complete even if the connection is closed.
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if err := r.Init(context.Background()); err != nil {
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return nil, fmt.Errorf("failed to init repo: %w", err)
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}
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zap.L().Debug("updating config", zap.Int32("version", c.Version))
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if err := s.config.Update(c); err != nil {
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return nil, fmt.Errorf("failed to update config: %w", err)
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}
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zap.L().Debug("applying config", zap.Int32("version", c.Version))
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s.orchestrator.ApplyConfig(c)
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// index snapshots for the newly added repository.
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zap.L().Debug("scheduling index snapshots task")
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s.orchestrator.ScheduleTask(tasks.NewOneoffIndexSnapshotsTask(req.Msg.Id, time.Now()), tasks.TaskPriorityInteractive+tasks.TaskPriorityIndexSnapshots)
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zap.L().Debug("done add repo")
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return connect.NewResponse(c), nil
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}
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// ListSnapshots implements POST /v1/snapshots
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func (s *BackrestHandler) ListSnapshots(ctx context.Context, req *connect.Request[v1.ListSnapshotsRequest]) (*connect.Response[v1.ResticSnapshotList], error) {
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query := req.Msg
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repo, err := s.orchestrator.GetRepoOrchestrator(query.RepoId)
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if err != nil {
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return nil, fmt.Errorf("failed to get repo: %w", err)
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}
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var snapshots []*restic.Snapshot
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if query.PlanId != "" {
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var plan *v1.Plan
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plan, err = s.orchestrator.GetPlan(query.PlanId)
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if err != nil {
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return nil, fmt.Errorf("failed to get plan %q: %w", query.PlanId, err)
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}
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snapshots, err = repo.SnapshotsForPlan(ctx, plan)
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} else {
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snapshots, err = repo.Snapshots(ctx)
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}
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if err != nil {
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return nil, fmt.Errorf("failed to list snapshots: %w", err)
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}
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// Transform the snapshots and return them.
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var rs []*v1.ResticSnapshot
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for _, snapshot := range snapshots {
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rs = append(rs, protoutil.SnapshotToProto(snapshot))
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}
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return connect.NewResponse(&v1.ResticSnapshotList{
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Snapshots: rs,
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}), nil
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}
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func (s *BackrestHandler) ListSnapshotFiles(ctx context.Context, req *connect.Request[v1.ListSnapshotFilesRequest]) (*connect.Response[v1.ListSnapshotFilesResponse], error) {
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query := req.Msg
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repo, err := s.orchestrator.GetRepoOrchestrator(query.RepoId)
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if err != nil {
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return nil, fmt.Errorf("failed to get repo: %w", err)
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}
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entries, err := repo.ListSnapshotFiles(ctx, query.SnapshotId, query.Path)
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if err != nil {
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return nil, fmt.Errorf("failed to list snapshot files: %w", err)
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}
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return connect.NewResponse(&v1.ListSnapshotFilesResponse{
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Path: query.Path,
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Entries: entries,
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}), nil
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}
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// GetOperationEvents implements GET /v1/events/operations
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func (s *BackrestHandler) GetOperationEvents(ctx context.Context, req *connect.Request[emptypb.Empty], resp *connect.ServerStream[v1.OperationEvent]) error {
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errChan := make(chan error, 1)
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events := make(chan *v1.OperationEvent, 100)
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timer := time.NewTicker(60 * time.Second)
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defer timer.Stop()
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callback := func(ops []*v1.Operation, eventType oplog.OperationEvent) {
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var event *v1.OperationEvent
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switch eventType {
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case oplog.OPERATION_ADDED:
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event = &v1.OperationEvent{
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Event: &v1.OperationEvent_CreatedOperations{
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CreatedOperations: &v1.OperationList{
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Operations: ops,
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},
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},
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}
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case oplog.OPERATION_UPDATED:
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event = &v1.OperationEvent{
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Event: &v1.OperationEvent_UpdatedOperations{
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UpdatedOperations: &v1.OperationList{
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Operations: ops,
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},
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},
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}
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case oplog.OPERATION_DELETED:
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ids := make([]int64, len(ops))
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for i, o := range ops {
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ids[i] = o.Id
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}
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event = &v1.OperationEvent{
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Event: &v1.OperationEvent_DeletedOperations{
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DeletedOperations: &types.Int64List{
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Values: ids,
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},
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},
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}
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default:
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zap.L().Error("Unknown event type")
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}
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select {
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case events <- event:
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default:
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select {
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case errChan <- errors.New("event buffer overflow, closing stream for client retry and catchup"):
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default:
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}
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}
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}
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s.oplog.Subscribe(oplog.SelectAll, &callback)
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defer func() {
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if err := s.oplog.Unsubscribe(&callback); err != nil {
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zap.L().Error("failed to unsubscribe from oplog", zap.Error(err))
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}
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}()
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for {
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select {
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case <-timer.C:
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if err := resp.Send(&v1.OperationEvent{
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Event: &v1.OperationEvent_KeepAlive{},
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}); err != nil {
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return err
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}
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case err := <-errChan:
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return err
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case <-ctx.Done():
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return nil
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case event := <-events:
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if err := resp.Send(event); err != nil {
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return err
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}
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}
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}
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}
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func (s *BackrestHandler) GetOperations(ctx context.Context, req *connect.Request[v1.GetOperationsRequest]) (*connect.Response[v1.OperationList], error) {
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q, err := opSelectorToQuery(req.Msg.Selector)
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if req.Msg.LastN != 0 {
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q.Reversed = true
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q.Limit = int(req.Msg.LastN)
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}
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if err != nil {
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return nil, err
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}
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var ops []*v1.Operation
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opCollector := func(op *v1.Operation) error {
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ops = append(ops, op)
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return nil
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}
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err = s.oplog.Query(q, opCollector)
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if err != nil {
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return nil, fmt.Errorf("failed to get operations: %w", err)
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}
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slices.SortFunc(ops, func(i, j *v1.Operation) int {
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if i.Id < j.Id {
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return -1
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}
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return 1
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})
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return connect.NewResponse(&v1.OperationList{
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Operations: ops,
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}), nil
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}
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func (s *BackrestHandler) IndexSnapshots(ctx context.Context, req *connect.Request[types.StringValue]) (*connect.Response[emptypb.Empty], error) {
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_, err := s.orchestrator.GetRepo(req.Msg.Value)
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if err != nil {
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return nil, fmt.Errorf("failed to get repo %q: %w", req.Msg.Value, err)
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}
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s.orchestrator.ScheduleTask(tasks.NewOneoffIndexSnapshotsTask(req.Msg.Value, time.Now()), tasks.TaskPriorityInteractive+tasks.TaskPriorityIndexSnapshots)
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return connect.NewResponse(&emptypb.Empty{}), nil
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}
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func (s *BackrestHandler) Backup(ctx context.Context, req *connect.Request[types.StringValue]) (*connect.Response[emptypb.Empty], error) {
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plan, err := s.orchestrator.GetPlan(req.Msg.Value)
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if err != nil {
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return nil, fmt.Errorf("failed to get plan %q: %w", req.Msg.Value, err)
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}
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wait := make(chan struct{})
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s.orchestrator.ScheduleTask(tasks.NewOneoffBackupTask(plan, time.Now()), tasks.TaskPriorityInteractive, func(e error) {
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err = e
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close(wait)
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})
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<-wait
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return connect.NewResponse(&emptypb.Empty{}), err
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}
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func (s *BackrestHandler) Forget(ctx context.Context, req *connect.Request[v1.ForgetRequest]) (*connect.Response[emptypb.Empty], error) {
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at := time.Now()
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var err error
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if req.Msg.SnapshotId != "" && req.Msg.PlanId != "" && req.Msg.RepoId != "" {
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wait := make(chan struct{})
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s.orchestrator.ScheduleTask(
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tasks.NewOneoffForgetSnapshotTask(req.Msg.RepoId, req.Msg.PlanId, 0, at, req.Msg.SnapshotId),
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tasks.TaskPriorityInteractive+tasks.TaskPriorityForget, func(e error) {
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err = e
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close(wait)
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})
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<-wait
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} else if req.Msg.RepoId != "" && req.Msg.PlanId != "" {
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wait := make(chan struct{})
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s.orchestrator.ScheduleTask(
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tasks.NewOneoffForgetTask(req.Msg.RepoId, req.Msg.PlanId, 0, at),
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tasks.TaskPriorityInteractive+tasks.TaskPriorityForget, func(e error) {
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err = e
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close(wait)
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})
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<-wait
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} else {
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return nil, errors.New("must specify repoId and planId and (optionally) snapshotId")
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}
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if err != nil {
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return nil, err
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}
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return connect.NewResponse(&emptypb.Empty{}), nil
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}
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func (s BackrestHandler) DoRepoTask(ctx context.Context, req *connect.Request[v1.DoRepoTaskRequest]) (*connect.Response[emptypb.Empty], error) {
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var task tasks.Task
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priority := tasks.TaskPriorityInteractive
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switch req.Msg.Task {
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case v1.DoRepoTaskRequest_TASK_CHECK:
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task = tasks.NewCheckTask(req.Msg.RepoId, tasks.PlanForSystemTasks, true)
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case v1.DoRepoTaskRequest_TASK_PRUNE:
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task = tasks.NewPruneTask(req.Msg.RepoId, tasks.PlanForSystemTasks, true)
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priority |= tasks.TaskPriorityPrune
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case v1.DoRepoTaskRequest_TASK_STATS:
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task = tasks.NewStatsTask(req.Msg.RepoId, tasks.PlanForSystemTasks, true)
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priority |= tasks.TaskPriorityStats
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case v1.DoRepoTaskRequest_TASK_INDEX_SNAPSHOTS:
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task = tasks.NewOneoffIndexSnapshotsTask(req.Msg.RepoId, time.Now())
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priority |= tasks.TaskPriorityIndexSnapshots
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case v1.DoRepoTaskRequest_TASK_UNLOCK:
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repo, err := s.orchestrator.GetRepoOrchestrator(req.Msg.RepoId)
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if err != nil {
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return nil, fmt.Errorf("failed to get repo %q: %w", req.Msg.RepoId, err)
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}
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if err := repo.Unlock(ctx); err != nil {
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return nil, fmt.Errorf("failed to unlock repo %q: %w", req.Msg.RepoId, err)
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}
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return connect.NewResponse(&emptypb.Empty{}), nil
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default:
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return nil, fmt.Errorf("unknown task %v", req.Msg.Task.String())
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}
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var err error
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wait := make(chan struct{})
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if err := s.orchestrator.ScheduleTask(task, priority, func(e error) {
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err = e
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close(wait)
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}); err != nil {
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return nil, err
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}
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<-wait
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if err != nil {
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return nil, err
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}
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return connect.NewResponse(&emptypb.Empty{}), nil
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}
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func (s *BackrestHandler) Restore(ctx context.Context, req *connect.Request[v1.RestoreSnapshotRequest]) (*connect.Response[emptypb.Empty], error) {
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if req.Msg.Target == "" {
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req.Msg.Target = path.Join(os.Getenv("HOME"), "Downloads", fmt.Sprintf("restic-restore-%v", time.Now().Format("2006-01-02T15-04-05")))
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}
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if req.Msg.Path == "" {
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req.Msg.Path = "/"
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}
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// prevent restoring to a directory that already exists
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if _, err := os.Stat(req.Msg.Target); err == nil {
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return nil, fmt.Errorf("target directory %q already exists", req.Msg.Target)
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}
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at := time.Now()
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s.orchestrator.ScheduleTask(tasks.NewOneoffRestoreTask(req.Msg.RepoId, req.Msg.PlanId, 0 /* flowID */, at, req.Msg.SnapshotId, req.Msg.Path, req.Msg.Target), tasks.TaskPriorityInteractive+tasks.TaskPriorityDefault)
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return connect.NewResponse(&emptypb.Empty{}), nil
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}
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func (s *BackrestHandler) RunCommand(ctx context.Context, req *connect.Request[v1.RunCommandRequest], resp *connect.ServerStream[types.BytesValue]) error {
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repo, err := s.orchestrator.GetRepoOrchestrator(req.Msg.RepoId)
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if err != nil {
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return fmt.Errorf("failed to get repo %q: %w", req.Msg.RepoId, err)
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}
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ctx, cancel := context.WithCancel(ctx)
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outputs := make(chan []byte, 100)
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errChan := make(chan error, 1)
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go func() {
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start := time.Now()
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zap.S().Infof("running command for webui: %v", req.Msg.Command)
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if err := repo.RunCommand(ctx, req.Msg.Command, func(output []byte) {
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outputs <- bytes.Clone(output)
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}); err != nil && ctx.Err() == nil {
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zap.S().Errorf("error running command for webui: %v", err)
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errChan <- err
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} else {
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zap.S().Infof("command completed for webui: %v", time.Since(start))
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}
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outputs <- []byte("took " + time.Since(start).String())
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cancel()
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}()
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ticker := time.NewTicker(100 * time.Millisecond)
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defer ticker.Stop()
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bufSize := 32 * 1024
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buf := make([]byte, 0, bufSize)
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flush := func() error {
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if len(buf) > 0 {
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if err := resp.Send(&types.BytesValue{Value: buf}); err != nil {
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return fmt.Errorf("failed to write output: %w", err)
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}
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buf = buf[:0]
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}
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return nil
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}
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for {
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select {
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case err := <-errChan:
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if err := flush(); err != nil {
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return err
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}
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|
return err
|
|
case <-ctx.Done():
|
|
return flush()
|
|
case output := <-outputs:
|
|
if len(output)+len(buf) > bufSize {
|
|
flush()
|
|
}
|
|
if len(output) > bufSize {
|
|
if err := resp.Send(&types.BytesValue{Value: output}); err != nil {
|
|
return fmt.Errorf("failed to write output: %w", err)
|
|
}
|
|
continue
|
|
}
|
|
buf = append(buf, output...)
|
|
case <-ticker.C:
|
|
if len(buf) > 0 {
|
|
flush()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *BackrestHandler) Cancel(ctx context.Context, req *connect.Request[types.Int64Value]) (*connect.Response[emptypb.Empty], error) {
|
|
if err := s.orchestrator.CancelOperation(req.Msg.Value, v1.OperationStatus_STATUS_USER_CANCELLED); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return connect.NewResponse(&emptypb.Empty{}), nil
|
|
}
|
|
|
|
func (s *BackrestHandler) ClearHistory(ctx context.Context, req *connect.Request[v1.ClearHistoryRequest]) (*connect.Response[emptypb.Empty], error) {
|
|
var err error
|
|
var ids []int64
|
|
|
|
opCollector := func(op *v1.Operation) error {
|
|
if !req.Msg.OnlyFailed || op.Status == v1.OperationStatus_STATUS_ERROR {
|
|
ids = append(ids, op.Id)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
q, err := opSelectorToQuery(req.Msg.Selector)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if err := s.oplog.Query(q, opCollector); err != nil {
|
|
return nil, fmt.Errorf("failed to get operations to delete: %w", err)
|
|
}
|
|
|
|
if err := s.oplog.Delete(ids...); err != nil {
|
|
return nil, fmt.Errorf("failed to delete operations: %w", err)
|
|
}
|
|
|
|
return connect.NewResponse(&emptypb.Empty{}), err
|
|
}
|
|
|
|
func (s *BackrestHandler) GetLogs(ctx context.Context, req *connect.Request[v1.LogDataRequest]) (*connect.Response[types.BytesValue], error) {
|
|
data, err := s.logStore.Read(req.Msg.GetRef())
|
|
if err != nil {
|
|
if errors.Is(err, rotatinglog.ErrFileNotFound) {
|
|
return connect.NewResponse(&types.BytesValue{
|
|
Value: []byte(fmt.Sprintf("file associated with log %v not found, it may have rotated out of the log history", req.Msg.GetRef())),
|
|
}), nil
|
|
}
|
|
|
|
return nil, fmt.Errorf("get log data %v: %w", req.Msg.GetRef(), err)
|
|
}
|
|
return connect.NewResponse(&types.BytesValue{Value: data}), nil
|
|
}
|
|
|
|
func (s *BackrestHandler) GetDownloadURL(ctx context.Context, req *connect.Request[types.Int64Value]) (*connect.Response[types.StringValue], error) {
|
|
op, err := s.oplog.Get(req.Msg.Value)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to get operation %v: %w", req.Msg.Value, err)
|
|
}
|
|
_, ok := op.Op.(*v1.Operation_OperationRestore)
|
|
if !ok {
|
|
return nil, fmt.Errorf("operation %v is not a restore operation", req.Msg.Value)
|
|
}
|
|
signature, err := signInt64(op.Id) // the signature authenticates the download URL. Note that the shared URL will be valid for any downloader.
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to generate signature: %w", err)
|
|
}
|
|
return connect.NewResponse(&types.StringValue{
|
|
Value: fmt.Sprintf("./download/%x-%s/", op.Id, hex.EncodeToString(signature)),
|
|
}), nil
|
|
}
|
|
|
|
func (s *BackrestHandler) PathAutocomplete(ctx context.Context, path *connect.Request[types.StringValue]) (*connect.Response[types.StringList], error) {
|
|
ents, err := os.ReadDir(path.Msg.Value)
|
|
if errors.Is(err, os.ErrNotExist) {
|
|
return connect.NewResponse(&types.StringList{}), nil
|
|
} else if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var paths []string
|
|
for _, ent := range ents {
|
|
paths = append(paths, ent.Name())
|
|
}
|
|
|
|
return connect.NewResponse(&types.StringList{Values: paths}), nil
|
|
}
|
|
|
|
func opSelectorToQuery(sel *v1.OpSelector) (oplog.Query, error) {
|
|
if sel == nil {
|
|
return oplog.Query{}, errors.New("empty selector")
|
|
}
|
|
q := oplog.Query{
|
|
RepoID: sel.RepoId,
|
|
PlanID: sel.PlanId,
|
|
SnapshotID: sel.SnapshotId,
|
|
FlowID: sel.FlowId,
|
|
}
|
|
if len(sel.Ids) > 0 && !reflect.DeepEqual(q, oplog.Query{}) {
|
|
return oplog.Query{}, errors.New("cannot specify both query and ids")
|
|
}
|
|
q.OpIDs = sel.Ids
|
|
return q, nil
|
|
}
|