query

package
v0.50.0 Latest Latest
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 Go to latest Published: Nov 7, 2023 License: Apache-2.0 Imports: 15 Imported by: 6,049

Documentation

Index

Constants

View Source 
const DefaultLimit = 100

DefaultLimit is the default `limit` for queries if the `limit` is not supplied, paginate will use `DefaultLimit`

View Source 
const DefaultPage = 1

DefaultPage is the default `page` number for queries. If the `page` number is not supplied, `DefaultPage` will be used.

Variables

View Source 
var (
	ErrInvalidLengthPagination        = fmt.Errorf("proto: negative length found during unmarshaling")
	ErrIntOverflowPagination          = fmt.Errorf("proto: integer overflow")
	ErrUnexpectedEndOfGroupPagination = fmt.Errorf("proto: unexpected end of group")
)
View Source 
var E_ModuleQuerySafe = &proto.ExtensionDesc{
	ExtendedType:  (*descriptorpb.MethodOptions)(nil),
	ExtensionType: (*bool)(nil),
	Field:         11110001,
	Name:          "cosmos.query.v1.module_query_safe",
	Tag:           "varint,11110001,opt,name=module_query_safe",
	Filename:      "cosmos/query/v1/query.proto",
}
View Source 
var PaginationMaxLimit uint64 = math.MaxUint64

PaginationMaxLimit is the maximum limit the paginate function can handle which equals the maximum value that can be stored in uint64

Functions

func ParsePagination 

func ParsePagination(pageReq *PageRequest) (page, limit int, err error)

ParsePagination validate PageRequest and returns page number & limit.

func WithCollectionPaginationPairPrefix added in v0.50.0 

func WithCollectionPaginationPairPrefix[K1, K2 any](prefix K1) func(o *CollectionsPaginateOptions[collections.Pair[K1, K2]])

WithCollectionPaginationPairPrefix applies a prefix to a collection, whose key is a collection.Pair, being paginated that needs prefixing.

func WithCollectionPaginationTriplePrefix added in v0.50.0 

func WithCollectionPaginationTriplePrefix[K1, K2, K3 any](prefix K1) func(o *CollectionsPaginateOptions[collections.Triple[K1, K2, K3]])

WithCollectionPaginationTriplePrefix applies a prefix to a collection, whose key is a collection.Triple, being paginated that needs prefixing.

Types

type Collection added in v0.50.0 

type Collection[K, V any] interface {
	// IterateRaw allows to iterate over a raw set of byte keys.
	IterateRaw(ctx context.Context, start, end []byte, order collections.Order) (collections.Iterator[K, V], error)
	// KeyCodec exposes the KeyCodec of a collection, required to encode a collection key from and to bytes
	// for pagination request and response.
	KeyCodec() collcodec.KeyCodec[K]
}

Collection defines the minimum required API of a collection to work with pagination.

type CollectionsPaginateOptions added in v0.50.0 

type CollectionsPaginateOptions[K any] struct {
	// Prefix allows to optionally set a prefix for the pagination.
	Prefix *K
}

CollectionsPaginateOptions provides extra options for pagination in collections.

type PageRequest 

type PageRequest struct {
	// key is a value returned in PageResponse.next_key to begin
	// querying the next page most efficiently. Only one of offset or key
	// should be set.
	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
	// offset is a numeric offset that can be used when key is unavailable.
	// It is less efficient than using key. Only one of offset or key should
	// be set.
	Offset uint64 `protobuf:"varint,2,opt,name=offset,proto3" json:"offset,omitempty"`
	// limit is the total number of results to be returned in the result page.
	// If left empty it will default to a value to be set by each app.
	Limit uint64 `protobuf:"varint,3,opt,name=limit,proto3" json:"limit,omitempty"`
	// count_total is set to true  to indicate that the result set should include
	// a count of the total number of items available for pagination in UIs.
	// count_total is only respected when offset is used. It is ignored when key
	// is set.
	CountTotal bool `protobuf:"varint,4,opt,name=count_total,json=countTotal,proto3" json:"count_total,omitempty"`
	// reverse is set to true if results are to be returned in the descending order.
	//
	// Since: cosmos-sdk 0.43
	Reverse bool `protobuf:"varint,5,opt,name=reverse,proto3" json:"reverse,omitempty"`
}

PageRequest is to be embedded in gRPC request messages for efficient pagination. Ex: 

message SomeRequest {
        Foo some_parameter = 1;
        PageRequest pagination = 2;
}

func (*PageRequest) Descriptor 

func (*PageRequest) Descriptor() ([]byte, []int)

func (*PageRequest) GetCountTotal 

func (m *PageRequest) GetCountTotal() bool

func (*PageRequest) GetKey 

func (m *PageRequest) GetKey() []byte

func (*PageRequest) GetLimit 

func (m *PageRequest) GetLimit() uint64

func (*PageRequest) GetOffset 

func (m *PageRequest) GetOffset() uint64

func (*PageRequest) GetReverse added in v0.43.0 

func (m *PageRequest) GetReverse() bool

func (*PageRequest) Marshal 

func (m *PageRequest) Marshal() (dAtA []byte, err error)

func (*PageRequest) MarshalTo 

func (m *PageRequest) MarshalTo(dAtA []byte) (int, error)

func (*PageRequest) MarshalToSizedBuffer 

func (m *PageRequest) MarshalToSizedBuffer(dAtA []byte) (int, error)

func (*PageRequest) ProtoMessage 

func (*PageRequest) ProtoMessage()

func (*PageRequest) Reset 

func (m *PageRequest) Reset()

func (*PageRequest) Size 

func (m *PageRequest) Size() (n int)

func (*PageRequest) String 

func (m *PageRequest) String() string

func (*PageRequest) Unmarshal 

func (m *PageRequest) Unmarshal(dAtA []byte) error

func (*PageRequest) XXX_DiscardUnknown 

func (m *PageRequest) XXX_DiscardUnknown()

func (*PageRequest) XXX_Marshal 

func (m *PageRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)

func (*PageRequest) XXX_Merge 

func (m *PageRequest) XXX_Merge(src proto.Message)

func (*PageRequest) XXX_Size 

func (m *PageRequest) XXX_Size() int

func (*PageRequest) XXX_Unmarshal 

func (m *PageRequest) XXX_Unmarshal(b []byte) error

type PageResponse 

type PageResponse struct {
	// next_key is the key to be passed to PageRequest.key to
	// query the next page most efficiently. It will be empty if
	// there are no more results.
	NextKey []byte `protobuf:"bytes,1,opt,name=next_key,json=nextKey,proto3" json:"next_key,omitempty"`
	// total is total number of results available if PageRequest.count_total
	// was set, its value is undefined otherwise
	Total uint64 `protobuf:"varint,2,opt,name=total,proto3" json:"total,omitempty"`
}

PageResponse is to be embedded in gRPC response messages where the corresponding request message has used PageRequest. 

message SomeResponse {
        repeated Bar results = 1;
        PageResponse page = 2;
}

func CollectionFilteredPaginate added in v0.50.0 

func CollectionFilteredPaginate[K, V any, C Collection[K, V], T any](
	ctx context.Context,
	coll C,
	pageReq *PageRequest,
	predicateFunc func(key K, value V) (include bool, err error),
	transformFunc func(key K, value V) (T, error),
	opts ...func(opt *CollectionsPaginateOptions[K]),
) (results []T, pageRes *PageResponse, err error)

CollectionFilteredPaginate works in the same way as CollectionPaginate but allows to filter results using a predicateFunc. A nil predicateFunc means no filtering is applied and results are collected as is. TransformFunc is applied only to results which are in range of the pagination and allow to convert the result to a different type. NOTE: do not collect results using the values/keys passed to predicateFunc as they are not guaranteed to be in the pagination range requested.

func CollectionPaginate added in v0.50.0 

func CollectionPaginate[K, V any, C Collection[K, V], T any](
	ctx context.Context,
	coll C,
	pageReq *PageRequest,
	transformFunc func(key K, value V) (T, error),
	opts ...func(opt *CollectionsPaginateOptions[K]),
) ([]T, *PageResponse, error)

CollectionPaginate follows the same logic as Paginate but for collection types. transformFunc is used to transform the result to a different type.

func FilteredPaginate 

func FilteredPaginate(
	prefixStore types.KVStore,
	pageRequest *PageRequest,
	onResult func(key, value []byte, accumulate bool) (bool, error),
) (*PageResponse, error)

FilteredPaginate does pagination of all the results in the PrefixStore based on the provided PageRequest. onResult should be used to do actual unmarshaling and filter the results. If key is provided, the pagination uses the optimized querying. If offset is used, the pagination uses lazy filtering i.e., searches through all the records. The accumulate parameter represents if the response is valid based on the offset given. It will be false for the results (filtered) < offset and true for `offset > accumulate <= end`. When accumulate is set to true the current result should be appended to the result set returned to the client.

func GenericFilteredPaginate added in v0.45.6 

func GenericFilteredPaginate[T, F proto.Message](
	cdc codec.BinaryCodec,
	prefixStore types.KVStore,
	pageRequest *PageRequest,
	onResult func(key []byte, value T) (F, error),
	constructor func() T,
) ([]F, *PageResponse, error)

GenericFilteredPaginate does pagination of all the results in the PrefixStore based on the provided PageRequest. `onResult` should be used to filter or transform the results. `c` is a constructor function that needs to return a new instance of the type T (this is to workaround some generic pitfalls in which we can't instantiate a T struct inside the function). If key is provided, the pagination uses the optimized querying. If offset is used, the pagination uses lazy filtering i.e., searches through all the records. The resulting slice (of type F) can be of a different type than the one being iterated through (type T), so it's possible to do any necessary transformation inside the onResult function.

func Paginate 

func Paginate(
	prefixStore types.KVStore,
	pageRequest *PageRequest,
	onResult func(key, value []byte) error,
) (*PageResponse, error)

Paginate does pagination of all the results in the PrefixStore based on the provided PageRequest. onResult should be used to do actual unmarshaling.

func (*PageResponse) Descriptor 

func (*PageResponse) Descriptor() ([]byte, []int)

func (*PageResponse) GetNextKey 

func (m *PageResponse) GetNextKey() []byte

func (*PageResponse) GetTotal 

func (m *PageResponse) GetTotal() uint64

func (*PageResponse) Marshal 

func (m *PageResponse) Marshal() (dAtA []byte, err error)

func (*PageResponse) MarshalTo 

func (m *PageResponse) MarshalTo(dAtA []byte) (int, error)

func (*PageResponse) MarshalToSizedBuffer 

func (m *PageResponse) MarshalToSizedBuffer(dAtA []byte) (int, error)

func (*PageResponse) ProtoMessage 

func (*PageResponse) ProtoMessage()

func (*PageResponse) Reset 

func (m *PageResponse) Reset()

func (*PageResponse) Size 

func (m *PageResponse) Size() (n int)

func (*PageResponse) String 

func (m *PageResponse) String() string

func (*PageResponse) Unmarshal 

func (m *PageResponse) Unmarshal(dAtA []byte) error

func (*PageResponse) XXX_DiscardUnknown 

func (m *PageResponse) XXX_DiscardUnknown()

func (*PageResponse) XXX_Marshal 

func (m *PageResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)

func (*PageResponse) XXX_Merge 

func (m *PageResponse) XXX_Merge(src proto.Message)

func (*PageResponse) XXX_Size 

func (m *PageResponse) XXX_Size() int

func (*PageResponse) XXX_Unmarshal 

func (m *PageResponse) XXX_Unmarshal(b []byte) error

Source Files

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