Struct exonum::helpers::fabric::Context

pub struct Context { /* fields omitted */ }

Context is a type, used to keep some values from Command into CommandExtension and vice verse. To access values stored inside Context, use ContextKey.

Examples

use exonum::node::NodeConfig;
use exonum::helpers::fabric::{keys, Context};

fn get_node_config(context: &Context) -> NodeConfig {
    context.get(keys::NODE_CONFIG).unwrap()
}

Methods

impl Context

pub fn arg<T: FromStr>(&self, key: &str) -> Result<T, Error> where     Error: From<<T as FromStr>::Err>,

Gets value of the command line argument.

pub fn set_arg(&mut self, key: &str, value: String)

Inserts value to the command line arguments map.

pub fn arg_multiple<T: FromStr>(&self, key: &str) -> Result<Vec<T>, Error> where     Error: From<<T as FromStr>::Err>,

Gets multiple values of the command line argument.

pub fn set_arg_multiple(&mut self, key: &str, values: Vec<String>)

Inserts multiple values to the command line arguments map.

pub fn get<'de, T: Deserialize<'de>>(     &self,     key: ContextKey<T> ) -> Result<T, Error>

Gets the variable from the context.

pub fn set<T: Serialize>(     &mut self,     key: ContextKey<T>,     value: T ) -> Option<Value>

Sets the variable in the context and returns the previous value.

Panic

Panics if value could not be serialized as TOML.

Trait Implementations

impl Default for Context

fn default() -> Context

Returns the "default value" for a type.

impl PartialEq<Context> for Context

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl Clone for Context

fn clone(&self) -> Context

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Context

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.