adt

package
v0.9.0-rc1 Latest Latest
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 Go to latest Published: Oct 7, 2022 License: Apache-2.0, MIT Imports: 14 Imported by: 48

Documentation

Index

Constants

View Source 
const BalanceTableBitwidth = 6

Bitwidth of balance table HAMTs, determined empirically from mutation patterns and projections of mainnet data

Variables

View Source 
var DefaultAmtOptions = []amt.Option{}
View Source 
var DefaultHamtOptions = []hamt.Option{
	hamt.UseHashFunction(func(input []byte) []byte {
		res := sha256.Sum256(input)
		return res[:]
	}),
}

DefaultHamtOptions specifies default options used to construct Filecoin HAMTs. Specific HAMT instances may specify additional options, especially the bitwidth.

Functions

func StoreEmptyArray 

func StoreEmptyArray(s Store, bitwidth int) (cid.Cid, error)

Writes a new empty array to the store, returning its CID.

func StoreEmptyMap 

func StoreEmptyMap(s Store, bitwidth int) (cid.Cid, error)

Creates and stores a new empty map, returning its CID.

func StoreEmptyMultimap 

func StoreEmptyMultimap(store Store, outerBitwidth, innerBitwidth int) (cid.Cid, error)

Creates and stores a new empty multimap, returning its CID.

Types

type Array 

type Array struct {
	// contains filtered or unexported fields
}

Array stores a sparse sequence of values in an AMT.

func AsArray 

func AsArray(s Store, r cid.Cid, bitwidth int) (*Array, error)

AsArray interprets a store as an AMT-based array with root `r`.

func MakeEmptyArray 

func MakeEmptyArray(s Store, bitwidth int) (*Array, error)

Creates a new array backed by an empty AMT.

func (*Array) AppendContinuous 

func (a *Array) AppendContinuous(value cbor.Marshaler) error

Appends a value to the end of the array. Assumes continuous array. If the array isn't continuous use Set and a separate counter

func (*Array) BatchDelete 

func (a *Array) BatchDelete(ix []uint64, strict bool) error

func (*Array) Delete 

func (a *Array) Delete(i uint64) error

Removes the value at index `i` from the AMT, expecting it to exist.

func (*Array) ForEach 

func (a *Array) ForEach(out cbor.Unmarshaler, fn func(i int64) error) error

Iterates all entries in the array, deserializing each value in turn into `out` and then calling a function. Iteration halts if the function returns an error. If the output parameter is nil, deserialization is skipped.

func (*Array) Get 

func (a *Array) Get(k uint64, out cbor.Unmarshaler) (bool, error)

Get retrieves array element into the 'out' unmarshaler, returning a boolean 

indicating whether the element was found in the array

func (*Array) Length 

func (a *Array) Length() uint64

func (*Array) Pop 

func (a *Array) Pop(k uint64, out cbor.Unmarshaler) (bool, error)

Retrieves an array value into the 'out' unmarshaler (if non-nil), and removes the entry. Returns a boolean indicating whether the element was previously in the array.

func (*Array) Root 

func (a *Array) Root() (cid.Cid, error)

Returns the root CID of the underlying AMT.

func (*Array) Set 

func (a *Array) Set(i uint64, value cbor.Marshaler) error

func (*Array) TryDelete 

func (a *Array) TryDelete(i uint64) (bool, error)

Removes the value at index `i` from the AMT, if it exists. Returns whether the index was previously present.

type BalanceTable 

type BalanceTable Map

A specialization of a map of addresses to (positive) token amounts. Absent keys implicitly have a balance of zero.

func AsBalanceTable 

func AsBalanceTable(s Store, r cid.Cid) (*BalanceTable, error)

Interprets a store as balance table with root `r`.

func (*BalanceTable) Get 

func (t *BalanceTable) Get(key addr.Address) (abi.TokenAmount, error)

Gets the balance for a key, which is zero if they key has never been added to.

type Map 

type Map struct {
	// contains filtered or unexported fields
}

Map stores key-value pairs in a HAMT.

func AsMap 

func AsMap(s Store, root cid.Cid, bitwidth int) (*Map, error)

AsMap interprets a store as a HAMT-based map with root `r`. The HAMT is interpreted with branching factor 2^bitwidth. We could drop this parameter if https://github.com/filecoin-project/go-hamt-ipld/issues/79 is implemented.

func MakeEmptyMap 

func MakeEmptyMap(s Store, bitwidth int) (*Map, error)

Creates a new map backed by an empty HAMT.

func (*Map) CollectKeys 

func (m *Map) CollectKeys() (out []string, err error)

Collects all the keys from the map into a slice of strings.

func (*Map) Delete 

func (m *Map) Delete(k abi.Keyer) error

Removes the value at `k` from the hamt store, expecting it to exist.

func (*Map) ForEach 

func (m *Map) ForEach(out cbor.Unmarshaler, fn func(key string) error) error

Iterates all entries in the map, deserializing each value in turn into `out` and then calling a function with the corresponding key. Iteration halts if the function returns an error. If the output parameter is nil, deserialization is skipped.

func (*Map) Get 

func (m *Map) Get(k abi.Keyer, out cbor.Unmarshaler) (bool, error)

Get retrieves the value at `k` into `out`, if the `k` is present and `out` is non-nil. Returns whether the key was found.

func (*Map) Has 

func (m *Map) Has(k abi.Keyer) (bool, error)

Has checks for the existence of a key without deserializing its value.

func (*Map) MarshalCBOR added in v0.9.0 

func (m *Map) MarshalCBOR(w io.Writer) error

func (*Map) Pop 

func (m *Map) Pop(k abi.Keyer, out cbor.Unmarshaler) (bool, error)

Retrieves the value for `k` into the 'out' unmarshaler (if non-nil), and removes the entry. Returns a boolean indicating whether the element was previously in the map.

func (*Map) Put 

func (m *Map) Put(k abi.Keyer, v cbor.Marshaler) error

Put adds value `v` with key `k` to the hamt store.

func (*Map) PutIfAbsent 

func (m *Map) PutIfAbsent(k abi.Keyer, v cbor.Marshaler) (bool, error)

Sets key key `k` to value `v` iff the key is not already present.

func (*Map) Root 

func (m *Map) Root() (cid.Cid, error)

Returns the root cid of underlying HAMT.

func (*Map) TryDelete 

func (m *Map) TryDelete(k abi.Keyer) (bool, error)

Removes the value at `k` from the hamt store, if it exists. Returns whether the key was previously present.

type Multimap 

type Multimap struct {
	// contains filtered or unexported fields
}

Multimap stores multiple values per key in a HAMT of AMTs. The order of insertion of values for each key is retained.

func MakeEmptyMultimap 

func MakeEmptyMultimap(s Store, outerBitwidth, innerBitwidth int) (*Multimap, error)

Creates a new map backed by an empty HAMT and flushes it to the store. The outer map has a branching factor of 2^bitwidth.

func (*Multimap) Root 

func (mm *Multimap) Root() (cid.Cid, error)

Returns the root cid of the underlying HAMT.

type Set added in v0.9.0 

type Set struct {
	// contains filtered or unexported fields
}

Set interprets a Map as a set, storing keys (with empty values) in a HAMT.

func AsSet added in v0.9.0 

func AsSet(s Store, r cid.Cid, bitwidth int) (*Set, error)

AsSet interprets a store as a HAMT-based set with root `r`. The HAMT is interpreted with branching factor 2^bitwidth.

func MakeEmptySet added in v0.9.0 

func MakeEmptySet(s Store, bitwidth int) (*Set, error)

NewSet creates a new HAMT with root `r` and store `s`. The HAMT has branching factor 2^bitwidth.

func (*Set) CollectKeys added in v0.9.0 

func (h *Set) CollectKeys() (out []string, err error)

Collects all the keys from the set into a slice of strings.

func (*Set) Delete added in v0.9.0 

func (h *Set) Delete(k abi.Keyer) error

Removes `k` from the set, expecting it to be present.

func (*Set) ForEach added in v0.9.0 

func (h *Set) ForEach(cb func(k string) error) error

ForEach iterates over all values in the set, calling the callback for each value. Returning error from the callback stops the iteration.

func (*Set) Has added in v0.9.0 

func (h *Set) Has(k abi.Keyer) (bool, error)

Has returns true iff `k` is in the set.

func (*Set) Put added in v0.9.0 

func (h *Set) Put(k abi.Keyer) error

Put adds `k` to the set.

func (*Set) Root added in v0.9.0 

func (h *Set) Root() (cid.Cid, error)

Root return the root cid of HAMT.

func (*Set) TryDelete added in v0.9.0 

func (h *Set) TryDelete(k abi.Keyer) (bool, error)

Removes `k` from the set, if present. Returns whether the key was previously present.

type Store 

type Store interface {
	Context() context.Context
	ipldcbor.IpldStore
}

Store defines an interface required to back the ADTs in this package.

func WrapStore 

func WrapStore(ctx context.Context, store ipldcbor.IpldStore) Store

Adapts a vanilla IPLD store as an ADT store.

Source Files

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