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Merge pull request #49 from filecoin-project/opt/refactor-travel-func
refactor badger db travel function
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| package badger | ||
|
|
||
| import ( | ||
| "bytes" | ||
| cborrpc "github.com/filecoin-project/go-cbor-util" | ||
| "github.com/ipfs/go-datastore" | ||
| "github.com/ipfs/go-datastore/query" | ||
| cbg "github.com/whyrusleeping/cbor-gen" | ||
| "golang.org/x/xerrors" | ||
| "reflect" | ||
| ) | ||
|
|
||
| func checkCallbackAndGetParamType(i interface{}) (reflect.Type, error) { | ||
| t := reflect.TypeOf(i) | ||
| if t.Kind() != reflect.Func { | ||
| return nil, xerrors.Errorf("must be a function") | ||
| } | ||
| if t.NumIn() != 1 { | ||
| return nil, xerrors.Errorf("callback must and only have 1 param") | ||
| } | ||
| if t.NumOut() != 1 { | ||
| return nil, xerrors.Errorf("callback must and only have 1 return value") | ||
| } | ||
| in := t.In(0) | ||
| if !in.Implements(reflect.TypeOf((*cbg.CBORUnmarshaler)(nil)).Elem()) { | ||
| return nil, xerrors.Errorf("param must be a CBORUnmarshaler") | ||
| } | ||
| if !t.Out(0).Implements(reflect.TypeOf((*error)(nil)).Elem()) { | ||
| return nil, xerrors.Errorf("return value must be an error interface") | ||
| } | ||
| return in.Elem(), nil | ||
| } | ||
|
|
||
| func travelDeals(ds datastore.Batching, callback interface{}) error { | ||
| instanceType, err := checkCallbackAndGetParamType(callback) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| result, err := ds.Query(query.Query{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| defer result.Close() //nolint:errcheck | ||
|
|
||
| for res := range result.Next() { | ||
| if res.Error != nil { | ||
| return err | ||
| } | ||
| i := reflect.New(instanceType).Interface() | ||
| unmarshaler := i.(cbg.CBORUnmarshaler) | ||
| if err = cborrpc.ReadCborRPC(bytes.NewReader(res.Value), unmarshaler); err != nil { | ||
| return err | ||
| } | ||
| rets := reflect.ValueOf(callback).Call([]reflect.Value{ | ||
| reflect.ValueOf(unmarshaler)}) | ||
|
|
||
| if !rets[0].IsNil() { | ||
| return rets[0].Interface().(error) | ||
| } | ||
| } | ||
| return nil | ||
| } |
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