Struct WriteStderr

pub struct WriteStderr {
    pub input: InputPort<Bytes>,
}

A block that writes bytes to standard error (aka stderr).

Block Diagram

block-beta
    columns 4
    Source space:2 WriteStderr
    Source-- "input" -->WriteStderr

    classDef block height:48px,padding:8px;
    classDef hidden visibility:none;
    class WriteStderr block
    class Source hidden

Sequence Diagram

sequenceDiagram
    autonumber
    participant BlockA as Another block
    participant WriteStderr.input as WriteStderr.input port
    participant WriteStderr as WriteStderr block

    BlockA-->>WriteStderr: Connect

    loop WriteStderr process
        BlockA->>WriteStderr: Message (Bytes)
        WriteStderr->>WriteStderr: Write bytes to standard error
    end

    BlockA-->>WriteStderr: Disconnect
    WriteStderr-->>WriteStderr.input: Close

Examples

Using the block in a system

System::build(|s| {
    let stdin = s.read_stdin();
    let stderr = s.write_stderr();
    s.connect(&stdin.output, &stderr.input);
});

Running the block via the CLI

$ protoflow execute WriteStderr < input.txt 2> output.txt

Fields

input: InputPort<Bytes>

The input message stream.

Implementations

impl WriteStderr

pub fn new(input: InputPort<Bytes>) -> Self

pub fn with_system(system: &System) -> Self

Trait Implementations

impl Block for WriteStderr

fn execute(&mut self, runtime: &dyn BlockRuntime) -> BlockResult

Executes this block’s computation.

fn prepare(&mut self, _runtime: &dyn BlockRuntime) -> Result<(), BlockError>

Prepares this block for execution.

impl BlockDescriptor for WriteStderr

fn inputs(&self) -> Vec<PortDescriptor>

A description of this block’s input ports.

fn outputs(&self) -> Vec<PortDescriptor>

A description of this block’s output ports.

fn parameters(&self) -> Vec<ParameterDescriptor>

A description of this block’s parameters.

fn ports(&self) -> Vec<PortDescriptor>

A description of this block’s I/O ports.

impl Clone for WriteStderr

fn clone(&self) -> WriteStderr

Returns a copy of the value.

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

Performs copy-assignment from source.

impl MaybeLabeled for WriteStderr

fn label(&self) -> Option<Cow<'_, str>>

Returns the human-readable label, if any, of the object.

fn is_labeled(&self) -> bool

Checks whether the object has a human-readable label.

impl MaybeNamed for WriteStderr

fn name(&self) -> Option<Cow<'_, str>>

Returns the name, if any, of the object.

fn is_named(&self) -> bool

Checks whether the object has a name.

impl StdioSystem for WriteStderr

fn build_system(config: StdioConfig) -> Result<System, StdioError>