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feat: add generic store interface and impl (#70)
* feat: add generic store interface and impl * remove gx
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,15 +1,14 @@ | ||
| gx: | ||
| go get github.com/whyrusleeping/gx | ||
| go get github.com/whyrusleeping/gx-go | ||
| all: build | ||
|
|
||
| covertools: | ||
| go get github.com/mattn/goveralls | ||
| go get golang.org/x/tools/cmd/cover | ||
| build: | ||
| go build ./... | ||
| .PHONY: build | ||
|
|
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| deps: gx covertools | ||
| gx --verbose install --global | ||
| gx-go rewrite | ||
| test: | ||
| go test ./... | ||
| .PHONY: test | ||
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||
| publish: | ||
| gx-go rewrite --undo | ||
| benchmark: | ||
| go test -bench=./... | ||
| .PHONY: benchmark | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| package cbornode | ||
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| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
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| block "github.com/ipfs/go-block-format" | ||
| cid "github.com/ipfs/go-cid" | ||
| mh "github.com/multiformats/go-multihash" | ||
| recbor "github.com/polydawn/refmt/cbor" | ||
| atlas "github.com/polydawn/refmt/obj/atlas" | ||
| cbg "github.com/whyrusleeping/cbor-gen" | ||
| ) | ||
|
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| type IpldStore interface { | ||
| Get(ctx context.Context, c cid.Cid, out interface{}) error | ||
| Put(ctx context.Context, v interface{}) (cid.Cid, error) | ||
| } | ||
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| type IpldBlockstore interface { | ||
| Get(cid.Cid) (block.Block, error) | ||
| Put(block.Block) error | ||
| } | ||
|
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| type BasicIpldStore struct { | ||
| Blocks IpldBlockstore | ||
| Atlas *atlas.Atlas | ||
| } | ||
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| var _ IpldStore = &BasicIpldStore{} | ||
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| func NewCborStore(bs IpldBlockstore) *BasicIpldStore { | ||
| return &BasicIpldStore{Blocks: bs} | ||
| } | ||
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| func (s *BasicIpldStore) Get(ctx context.Context, c cid.Cid, out interface{}) error { | ||
| blk, err := s.Blocks.Get(c) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| cu, ok := out.(cbg.CBORUnmarshaler) | ||
| if ok { | ||
| if err := cu.UnmarshalCBOR(bytes.NewReader(blk.RawData())); err != nil { | ||
| return NewSerializationError(err) | ||
| } | ||
| return nil | ||
| } | ||
|
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| if s.Atlas == nil { | ||
| return DecodeInto(blk.RawData(), out) | ||
| } else { | ||
| return recbor.UnmarshalAtlased(recbor.DecodeOptions{}, blk.RawData(), out, *s.Atlas) | ||
| } | ||
| } | ||
|
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| type cidProvider interface { | ||
| Cid() cid.Cid | ||
| } | ||
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| func (s *BasicIpldStore) Put(ctx context.Context, v interface{}) (cid.Cid, error) { | ||
| mhType := uint64(mh.BLAKE2B_MIN + 31) | ||
| mhLen := -1 | ||
| codec := uint64(cid.DagCBOR) | ||
|
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| var expCid cid.Cid | ||
| if c, ok := v.(cidProvider); ok { | ||
| expCid := c.Cid() | ||
| pref := expCid.Prefix() | ||
| mhType = pref.MhType | ||
| mhLen = pref.MhLength | ||
| codec = pref.Codec | ||
| } | ||
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| cm, ok := v.(cbg.CBORMarshaler) | ||
| if ok { | ||
| buf := new(bytes.Buffer) | ||
| if err := cm.MarshalCBOR(buf); err != nil { | ||
| return cid.Undef, err | ||
| } | ||
|
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| pref := cid.Prefix{ | ||
| Codec: codec, | ||
| MhType: mhType, | ||
| MhLength: mhLen, | ||
| Version: 1, | ||
| } | ||
| c, err := pref.Sum(buf.Bytes()) | ||
| if err != nil { | ||
| return cid.Undef, err | ||
| } | ||
|
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| blk, err := block.NewBlockWithCid(buf.Bytes(), c) | ||
| if err != nil { | ||
| return cid.Undef, err | ||
| } | ||
|
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| if err := s.Blocks.Put(blk); err != nil { | ||
| return cid.Undef, err | ||
| } | ||
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| blkCid := blk.Cid() | ||
| if expCid != cid.Undef && blkCid != expCid { | ||
| return cid.Undef, fmt.Errorf("your object is not being serialized the way it expects to") | ||
| } | ||
|
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| return blkCid, nil | ||
| } | ||
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| nd, err := WrapObject(v, mhType, mhLen) | ||
| if err != nil { | ||
| return cid.Undef, err | ||
| } | ||
|
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| if err := s.Blocks.Put(nd); err != nil { | ||
| return cid.Undef, err | ||
| } | ||
|
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| ndCid := nd.Cid() | ||
| if expCid != cid.Undef && ndCid != expCid { | ||
| return cid.Undef, fmt.Errorf("your object is not being serialized the way it expects to") | ||
| } | ||
|
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| return ndCid, nil | ||
| } | ||
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| func NewSerializationError(err error) error { | ||
| return SerializationError{err} | ||
| } | ||
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| type SerializationError struct { | ||
| err error | ||
| } | ||
|
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| func (se SerializationError) Error() string { | ||
| return se.err.Error() | ||
| } | ||
|
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| func (se SerializationError) Unwrap() error { | ||
| return se.err | ||
| } | ||
|
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| func (se SerializationError) Is(o error) bool { | ||
| _, ok := o.(*SerializationError) | ||
| return ok | ||
| } |