Struct Cursor 

pub struct Cursor {
    pub height: BlockHeight,
    pub index: u32,
}

A logical position in a chain’s stream of outgoing messages: the height of the block that produced the message and the index of the message-producing transaction within that block.

Fields

height: BlockHeight

The height of the producing block.

index: u32

The transaction index within the block.

Implementations

impl Cursor

pub async fn height( &self, ctx: &ContextBase<'_, &Positioned<Field>>, ) -> Result<&BlockHeight, Error>

pub async fn index( &self, ctx: &ContextBase<'_, &Positioned<Field>>, ) -> Result<&u32, Error>

impl Cursor

pub fn try_add_one(self) -> Result<Cursor, ArithmeticError>

Returns the cursor pointing to the next position within the same block, or ArithmeticError::Overflow if index is already at the maximum.

Trait Implementations

impl Allocative for Cursor

fn visit<'allocative_a, 'allocative_b>( &self, visitor: &'allocative_a mut Visitor<'allocative_b>, )

where 'allocative_b: 'allocative_a,

impl Clone for Cursor

fn clone(&self) -> Cursor

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl ContainerType for Cursor

async fn resolve_field( &self, ctx: &ContextBase<'_, &Positioned<Field>>, ) -> Result<Option<ConstValue>, ServerError>

Resolves a field value and outputs it as a json value async_graphql::Value.

fn collect_all_fields<'a>( &'a self, ctx: &ContextBase<'a, &'a Positioned<SelectionSet>>, fields: &mut Fields<'a>, ) -> Result<(), ServerError>

where Self: Send + Sync,

Collect all the fields of the container that are queried in the selection set.

fn find_entity( &self, _: &ContextBase<'_, &Positioned<Field>>, _params: &ConstValue, ) -> impl Future<Output = Result<Option<ConstValue>, ServerError>> + Send

Find the GraphQL entity with the given name from the parameter.

impl Debug for Cursor

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for Cursor

fn default() -> Cursor

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Cursor

fn deserialize<__D>( __deserializer: __D, ) -> Result<Cursor, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Cursor

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Cursor

fn cmp(&self, other: &Cursor) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl OutputType for Cursor

fn type_name() -> Cow<'static, str>

Type the name.

fn create_type_info(registry: &mut Registry) -> String

Create type information in the registry and return qualified typename.

async fn resolve( &self, ctx: &ContextBase<'_, &Positioned<SelectionSet>>, _field: &Positioned<Field>, ) -> Result<ConstValue, ServerError>

Resolve an output value to async_graphql::Value.

fn qualified_type_name() -> String

Qualified typename.

fn introspection_type_name(&self) -> Cow<'static, str>

Introspection type name

impl PartialEq for Cursor

fn eq(&self, other: &Cursor) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Cursor

fn partial_cmp(&self, other: &Cursor) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Cursor

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Cursor

impl Eq for Cursor

impl ObjectType for Cursor

impl StructuralPartialEq for Cursor