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feat: Support blob type sources and GCS as an example of such source. (…
…#1366) Signed-off-by: Alan Kutniewski <kutniewski@google.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| package blob | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/open-feature/flagd/core/pkg/logger" | ||
| "github.com/open-feature/flagd/core/pkg/sync" | ||
| "gocloud.dev/blob" | ||
| _ "gocloud.dev/blob/gcsblob" // needed to initialize GCS driver | ||
| ) | ||
|
|
||
| type Sync struct { | ||
| Bucket string | ||
| Object string | ||
| BlobURLMux *blob.URLMux | ||
| Cron Cron | ||
| Logger *logger.Logger | ||
| Interval uint32 | ||
| ready bool | ||
| lastUpdated time.Time | ||
| } | ||
|
|
||
| // Cron defines the behaviour required of a cron | ||
| type Cron interface { | ||
| AddFunc(spec string, cmd func()) error | ||
| Start() | ||
| Stop() | ||
| } | ||
|
|
||
| func (hs *Sync) Init(_ context.Context) error { | ||
| if hs.Bucket == "" { | ||
| return errors.New("no bucket string set") | ||
| } | ||
| if hs.Object == "" { | ||
| return errors.New("no object string set") | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (hs *Sync) IsReady() bool { | ||
| return hs.ready | ||
| } | ||
|
|
||
| func (hs *Sync) Sync(ctx context.Context, dataSync chan<- sync.DataSync) error { | ||
| hs.Logger.Info(fmt.Sprintf("starting sync from %s/%s with interval %ds", hs.Bucket, hs.Object, hs.Interval)) | ||
| _ = hs.Cron.AddFunc(fmt.Sprintf("*/%d * * * *", hs.Interval), func() { | ||
| err := hs.sync(ctx, dataSync, false) | ||
| if err != nil { | ||
| hs.Logger.Warn(fmt.Sprintf("sync failed: %v", err)) | ||
| } | ||
| }) | ||
| // Initial fetch | ||
| hs.Logger.Debug(fmt.Sprintf("initial sync of the %s/%s", hs.Bucket, hs.Object)) | ||
| err := hs.sync(ctx, dataSync, false) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| hs.ready = true | ||
| hs.Cron.Start() | ||
| <-ctx.Done() | ||
| hs.Cron.Stop() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (hs *Sync) ReSync(ctx context.Context, dataSync chan<- sync.DataSync) error { | ||
| return hs.sync(ctx, dataSync, true) | ||
| } | ||
|
|
||
| func (hs *Sync) sync(ctx context.Context, dataSync chan<- sync.DataSync, skipCheckingModTime bool) error { | ||
| bucket, err := hs.getBucket(ctx) | ||
| if err != nil { | ||
| return fmt.Errorf("couldn't get bucket: %v", err) | ||
| } | ||
| defer bucket.Close() | ||
| var updated time.Time | ||
| if !skipCheckingModTime { | ||
| updated, err = hs.fetchObjectModificationTime(ctx, bucket) | ||
| if err != nil { | ||
| return fmt.Errorf("couldn't get object attributes: %v", err) | ||
| } | ||
| if hs.lastUpdated == updated { | ||
| hs.Logger.Debug("configuration hasn't changed, skipping fetching full object") | ||
| return nil | ||
| } | ||
| if hs.lastUpdated.After(updated) { | ||
| hs.Logger.Warn("configuration changed but the modification time decreased instead of increasing") | ||
| } | ||
| } | ||
| msg, err := hs.fetchObject(ctx, bucket) | ||
| if err != nil { | ||
| return fmt.Errorf("couldn't get object: %v", err) | ||
| } | ||
| hs.Logger.Debug(fmt.Sprintf("configuration updated: %s", msg)) | ||
| if !skipCheckingModTime { | ||
| hs.lastUpdated = updated | ||
| } | ||
| dataSync <- sync.DataSync{FlagData: msg, Source: hs.Bucket + hs.Object, Type: sync.ALL} | ||
| return nil | ||
| } | ||
|
|
||
| func (hs *Sync) getBucket(ctx context.Context) (*blob.Bucket, error) { | ||
| b, err := hs.BlobURLMux.OpenBucket(ctx, hs.Bucket) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error opening bucket %s: %v", hs.Bucket, err) | ||
| } | ||
| return b, nil | ||
| } | ||
|
|
||
| func (hs *Sync) fetchObjectModificationTime(ctx context.Context, bucket *blob.Bucket) (time.Time, error) { | ||
| if hs.Object == "" { | ||
| return time.Time{}, errors.New("no object string set") | ||
| } | ||
| attrs, err := bucket.Attributes(ctx, hs.Object) | ||
| if err != nil { | ||
| return time.Time{}, fmt.Errorf("error fetching attributes for object %s/%s: %w", hs.Bucket, hs.Object, err) | ||
| } | ||
| return attrs.ModTime, nil | ||
| } | ||
|
|
||
| func (hs *Sync) fetchObject(ctx context.Context, bucket *blob.Bucket) (string, error) { | ||
| buf := bytes.NewBuffer(nil) | ||
| err := bucket.Download(ctx, hs.Object, buf, nil) | ||
| if err != nil { | ||
| return "", fmt.Errorf("error downloading object %s/%s: %w", hs.Bucket, hs.Object, err) | ||
| } | ||
|
|
||
| return buf.String(), nil | ||
| } |
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