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sources.go
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sources.go
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package bolt
import (
"context"
"github.com/boltdb/bolt"
cmp "github.com/snetsystems/cmp/backend"
"github.com/snetsystems/cmp/backend/bolt/internal"
"github.com/snetsystems/cmp/backend/roles"
)
// Ensure SourcesStore implements cmp.SourcesStore.
var _ cmp.SourcesStore = &SourcesStore{}
// SourcesBucket is the bolt bucket used to store source information
var SourcesBucket = []byte("Sources")
// SourcesStore is a bolt implementation to store time-series source information.
type SourcesStore struct {
client *Client
}
// Migrate ...
func (s *SourcesStore) Migrate(ctx context.Context) error {
sources, err := s.All(ctx)
if err != nil {
return err
}
defaultOrg, err := s.client.OrganizationsStore.DefaultOrganization(ctx)
if err != nil {
return err
}
for _, source := range sources {
if source.Organization == "" {
source.Organization = defaultOrg.ID
}
if source.Role == "" {
source.Role = roles.ViewerRoleName
}
if err := s.Update(ctx, source); err != nil {
return nil
}
}
return nil
}
// All returns all known sources
func (s *SourcesStore) All(ctx context.Context) ([]cmp.Source, error) {
var srcs []cmp.Source
if err := s.client.db.View(func(tx *bolt.Tx) error {
var err error
srcs, err = s.all(ctx, tx)
if err != nil {
return err
}
return nil
}); err != nil {
return nil, err
}
return srcs, nil
}
// Add creates a new Source in the SourceStore.
func (s *SourcesStore) Add(ctx context.Context, src cmp.Source) (cmp.Source, error) {
// force first source added to be default
if srcs, err := s.All(ctx); err != nil {
return cmp.Source{}, err
} else if len(srcs) == 0 {
src.Default = true
}
if err := s.client.db.Update(func(tx *bolt.Tx) error {
return s.add(ctx, &src, tx)
}); err != nil {
return cmp.Source{}, err
}
return src, nil
}
// Delete removes the Source from the SourcesStore
func (s *SourcesStore) Delete(ctx context.Context, src cmp.Source) error {
if err := s.client.db.Update(func(tx *bolt.Tx) error {
if err := s.setRandomDefault(ctx, src, tx); err != nil {
return err
}
return s.delete(ctx, src, tx)
}); err != nil {
return err
}
return nil
}
// Get returns a Source if the id exists.
func (s *SourcesStore) Get(ctx context.Context, id int) (cmp.Source, error) {
var src cmp.Source
if err := s.client.db.View(func(tx *bolt.Tx) error {
var err error
src, err = s.get(ctx, id, tx)
if err != nil {
return err
}
return nil
}); err != nil {
return cmp.Source{}, err
}
return src, nil
}
// Update a Source
func (s *SourcesStore) Update(ctx context.Context, src cmp.Source) error {
if err := s.client.db.Update(func(tx *bolt.Tx) error {
return s.update(ctx, src, tx)
}); err != nil {
return err
}
return nil
}
func (s *SourcesStore) all(ctx context.Context, tx *bolt.Tx) ([]cmp.Source, error) {
var srcs []cmp.Source
if err := tx.Bucket(SourcesBucket).ForEach(func(k, v []byte) error {
var src cmp.Source
if err := internal.UnmarshalSource(v, &src); err != nil {
return err
}
srcs = append(srcs, src)
return nil
}); err != nil {
return srcs, err
}
return srcs, nil
}
func (s *SourcesStore) add(ctx context.Context, src *cmp.Source, tx *bolt.Tx) error {
b := tx.Bucket(SourcesBucket)
seq, err := b.NextSequence()
if err != nil {
return err
}
src.ID = int(seq)
if src.Default {
if err := s.resetDefaultSource(ctx, tx); err != nil {
return err
}
}
if v, err := internal.MarshalSource(*src); err != nil {
return err
} else if err := b.Put(itob(src.ID), v); err != nil {
return err
}
return nil
}
func (s *SourcesStore) delete(ctx context.Context, src cmp.Source, tx *bolt.Tx) error {
if err := tx.Bucket(SourcesBucket).Delete(itob(src.ID)); err != nil {
return err
}
return nil
}
func (s *SourcesStore) get(ctx context.Context, id int, tx *bolt.Tx) (cmp.Source, error) {
var src cmp.Source
if v := tx.Bucket(SourcesBucket).Get(itob(id)); v == nil {
return src, cmp.ErrSourceNotFound
} else if err := internal.UnmarshalSource(v, &src); err != nil {
return src, err
}
return src, nil
}
func (s *SourcesStore) update(ctx context.Context, src cmp.Source, tx *bolt.Tx) error {
// Get an existing soource with the same ID.
b := tx.Bucket(SourcesBucket)
if v := b.Get(itob(src.ID)); v == nil {
return cmp.ErrSourceNotFound
}
if src.Default {
if err := s.resetDefaultSource(ctx, tx); err != nil {
return err
}
}
if v, err := internal.MarshalSource(src); err != nil {
return err
} else if err := b.Put(itob(src.ID), v); err != nil {
return err
}
return nil
}
// resetDefaultSource unsets the Default flag on all sources
func (s *SourcesStore) resetDefaultSource(ctx context.Context, tx *bolt.Tx) error {
b := tx.Bucket(SourcesBucket)
srcs, err := s.all(ctx, tx)
if err != nil {
return err
}
for _, other := range srcs {
if other.Default {
other.Default = false
if v, err := internal.MarshalSource(other); err != nil {
return err
} else if err := b.Put(itob(other.ID), v); err != nil {
return err
}
}
}
return nil
}
// setRandomDefault will locate a source other than the provided
// cmp.Source and set it as the default source. If no other sources are
// available, the provided source will be set to the default source if is not
// already. It assumes that the provided cmp.Source has been persisted.
func (s *SourcesStore) setRandomDefault(ctx context.Context, src cmp.Source, tx *bolt.Tx) error {
// Check if requested source is the current default
if target, err := s.get(ctx, src.ID, tx); err != nil {
return err
} else if target.Default {
// Locate another source to be the new default
srcs, err := s.all(ctx, tx)
if err != nil {
return err
}
var other *cmp.Source
for idx := range srcs {
other = &srcs[idx]
// avoid selecting the source we're about to delete as the new default
if other.ID != target.ID {
break
}
}
// set the other to be the default
other.Default = true
if err := s.update(ctx, *other, tx); err != nil {
return err
}
}
return nil
}