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feat: streaming output of CAR contents
Ref: ipld/go-car#363
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package internal | ||
|
|
||
| import ( | ||
| "context" | ||
| "io" | ||
|
|
||
| carstore "github.com/ipld/go-car/v2/storage" | ||
| "github.com/ipld/go-ipld-prime/storage" | ||
| ) | ||
|
|
||
| // putCbStore simply calls a callback on each put(), with the number of blocks put | ||
| var _ storage.StreamingReadableStorage = (*putCbStore)(nil) | ||
| var _ storage.ReadableStorage = (*putCbStore)(nil) | ||
| var _ storage.WritableStorage = (*putCbStore)(nil) | ||
|
|
||
| type putCbStore struct { | ||
| // parentOpener lazily opens the parent Store upon first call to this Store. | ||
| // This avoids Store instantiation until there is some interaction from the retriever. | ||
| // In the case of CARv2 Stores, this will avoid creation of empty .car files should | ||
| // the retriever fail to find any candidates. | ||
| parentOpener func() (*carstore.StorageCar, error) | ||
| // parent is lazily instantiated and should not be directly used; use parentStore instead. | ||
| parent *carstore.StorageCar | ||
| cb func(putCount int, putBytes int) | ||
| } | ||
|
|
||
| func NewPutCbStore(parentOpener func() (*carstore.StorageCar, error), cb func(putCount int, putBytes int)) *putCbStore { | ||
| return &putCbStore{parentOpener: parentOpener, cb: cb} | ||
| } | ||
|
|
||
| func (pcb *putCbStore) Has(ctx context.Context, key string) (bool, error) { | ||
| pbs, err := pcb.parentStore() | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| return pbs.Has(ctx, key) | ||
| } | ||
| func (pcb *putCbStore) Get(ctx context.Context, key string) ([]byte, error) { | ||
| pbs, err := pcb.parentStore() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return pbs.Get(ctx, key) | ||
| } | ||
| func (pcb *putCbStore) GetStream(ctx context.Context, key string) (io.ReadCloser, error) { | ||
| pbs, err := pcb.parentStore() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return pbs.GetStream(ctx, key) | ||
| } | ||
| func (pcb *putCbStore) Put(ctx context.Context, key string, data []byte) error { | ||
| pbs, err := pcb.parentStore() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| pcb.cb(1, len(data)) | ||
| return pbs.Put(ctx, key, data) | ||
| } | ||
| func (pcb *putCbStore) Finalize() error { | ||
| if pbs, err := pcb.parentStore(); err != nil { | ||
| return err | ||
| } else { | ||
| return pbs.Finalize() | ||
| } | ||
| } | ||
| func (pcb *putCbStore) parentStore() (*carstore.StorageCar, error) { | ||
| if pcb.parent == nil { | ||
| var err error | ||
| if pcb.parent, err = pcb.parentOpener(); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| return pcb.parent, nil | ||
| } |
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