Struct TransformPipeline

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pub struct TransformPipeline<I>where
    I: ScrapedItem + Serialize + DeserializeOwned,
{ /* private fields */ }

Expand description

A pipeline that transforms items and forwards transformed items downstream.

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impl TransformPipeline
where I: ScrapedItem + Serialize + DeserializeOwned,

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pub fn new() -> TransformPipeline

Creates a new empty TransformPipeline.

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pub fn with_operation( self, operation: TransformOperation, ) -> TransformPipeline

Adds a built-in transformation operation.

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pub fn with_transform<F>(self, transform: F) -> TransformPipeline
where F: Fn(&mut Value) -> Result<(), String> + Send + Sync + 'static,

Adds a custom transformation closure.

Trait Implementations§

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impl Default for TransformPipeline
where I: ScrapedItem + Serialize + DeserializeOwned,

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fn default() -> TransformPipeline

Returns the “default value” for a type. Read more

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impl Pipeline for TransformPipeline
where I: ScrapedItem + Serialize + DeserializeOwned,

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fn name(&self) -> &str

Returns the name of the pipeline.

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fn process_item<'life0, 'async_trait>( &'life0 self, item: I, ) -> Pin<Box<dyn Future<Output = Result<Option, PipelineError>> + Send + 'async_trait>>
where 'life0: 'async_trait, TransformPipeline: 'async_trait,

Processes a single scraped item. Read more

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fn close<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<(), PipelineError>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

Called when the spider is closing. Read more

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fn get_state<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<Option<Value>, PipelineError>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

Returns the current state of the pipeline as a JSON value. Read more

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fn restore_state<'life0, 'async_trait>( &'life0 self, _state: Value, ) -> Pin<Box<dyn Future<Output = Result<(), PipelineError>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

Restores the pipeline’s state from a JSON value. Read more

Auto Trait Implementations§

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impl !UnwindSafe for TransformPipeline

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.

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type Init = T

The type for initializers.

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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more

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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more

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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more

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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more

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impl<T> PolicyExt for T
where T: ?Sized,

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fn and<P, B, E>(self, other: P) -> And<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns Action::Follow only if self and other return Action::Follow. Read more

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fn or<P, B, E>(self, other: P) -> Or<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns Action::Follow if either self or other returns Action::Follow. Read more

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impl<T, U> TryFrom for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.

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fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T
where U: TryFrom<T>,

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type Error = >::Error

The type returned in the event of a conversion error.

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fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

TransformPipeline

Struct TransformPipeline Copy item path

Implementations§

impl<I> TransformPipeline<I>where I: ScrapedItem + Serialize + DeserializeOwned,

pub fn new() -> TransformPipeline<I>

pub fn with_operation( self, operation: TransformOperation, ) -> TransformPipeline<I>

pub fn with_transform<F>(self, transform: F) -> TransformPipeline<I>where F: Fn(&mut Value) -> Result<(), String> + Send + Sync + 'static,

Trait Implementations§

impl<I> Default for TransformPipeline<I>where I: ScrapedItem + Serialize + DeserializeOwned,

fn default() -> TransformPipeline<I>

impl<I> Pipeline<I> for TransformPipeline<I>where I: ScrapedItem + Serialize + DeserializeOwned,

fn name(&self) -> &str

fn process_item<'life0, 'async_trait>( &'life0 self, item: I, ) -> Pin<Box<dyn Future<Output = Result<Option<I>, PipelineError>> + Send + 'async_trait>>where 'life0: 'async_trait, TransformPipeline<I>: 'async_trait,

fn close<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<(), PipelineError>> + Send + 'async_trait>>where 'life0: 'async_trait, Self: 'async_trait,

fn get_state<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<Option<Value>, PipelineError>> + Send + 'async_trait>>where 'life0: 'async_trait, Self: 'async_trait,

fn restore_state<'life0, 'async_trait>( &'life0 self, _state: Value, ) -> Pin<Box<dyn Future<Output = Result<(), PipelineError>> + Send + 'async_trait>>where 'life0: 'async_trait, Self: 'async_trait,

Auto Trait Implementations§

impl<I> Freeze for TransformPipeline<I>

impl<I> !RefUnwindSafe for TransformPipeline<I>

impl<I> Send for TransformPipeline<I>

impl<I> Sync for TransformPipeline<I>

impl<I> Unpin for TransformPipeline<I>where I: Unpin,

impl<I> UnsafeUnpin for TransformPipeline<I>

impl<I> !UnwindSafe for TransformPipeline<I>

Blanket Implementations§

impl<T> Any for Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

fn from(t: T) -> T

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

fn in_current_span(self) -> Instrumented<Self>

impl<T, U> Into<U> for Twhere U: From<T>,

fn into(self) -> U

impl<T> Pointable for T

const ALIGN: usize

type Init = T

unsafe fn init(init: <T as Pointable>::Init) -> usize

unsafe fn deref<'a>(ptr: usize) -> &'a T

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

unsafe fn drop(ptr: usize)

impl<T> PolicyExt for Twhere T: ?Sized,

fn and<P, B, E>(self, other: P) -> And<T, P>where T: Policy<B, E>, P: Policy<B, E>,

fn or<P, B, E>(self, other: P) -> Or<T, P>where T: Policy<B, E>, P: Policy<B, E>,

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

fn vzip(self) -> V

impl<T> WithSubscriber for T

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

fn with_current_subscriber(self) -> WithDispatch<Self>

Struct TransformPipeline

impl<I> TransformPipeline<I>
where I: ScrapedItem + Serialize + DeserializeOwned,

pub fn with_transform<F>(self, transform: F) -> TransformPipeline<I>
where F: Fn(&mut Value) -> Result<(), String> + Send + Sync + 'static,

impl<I> Default for TransformPipeline<I>
where I: ScrapedItem + Serialize + DeserializeOwned,

impl<I> Pipeline<I> for TransformPipeline<I>
where I: ScrapedItem + Serialize + DeserializeOwned,

fn process_item<'life0, 'async_trait>( &'life0 self, item: I, ) -> Pin<Box<dyn Future<Output = Result<Option<I>, PipelineError>> + Send + 'async_trait>>
where 'life0: 'async_trait, TransformPipeline<I>: 'async_trait,

fn close<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<(), PipelineError>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

fn get_state<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<Option<Value>, PipelineError>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

fn restore_state<'life0, 'async_trait>( &'life0 self, _state: Value, ) -> Pin<Box<dyn Future<Output = Result<(), PipelineError>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

impl<I> Unpin for TransformPipeline<I>
where I: Unpin,

impl<T> Any for T
where T: 'static + ?Sized,

impl<T> Borrow<T> for T
where T: ?Sized,

impl<T> BorrowMut<T> for T
where T: ?Sized,

impl<T, U> Into<U> for T
where U: From<T>,

impl<T> PolicyExt for T
where T: ?Sized,

fn and<P, B, E>(self, other: P) -> And<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

fn or<P, B, E>(self, other: P) -> Or<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

impl<T, U> TryFrom<U> for T
where U: Into<T>,

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,