embedded-redis 0.9.0

A no_std Redis client
Documentation 
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//! Abstraction of BGSAVE command.
//!
//! For general information about this command, see the [Redis documentation](<https://redis.io/commands/bgsave/>).
//!
//! # Basic usage
//! By default no `SCHEDULE` option is used.
//! ```
//! # async_std::task::block_on(async {
//!# use core::str::FromStr;
//!# use core::net::SocketAddr;
//!# use std_embedded_nal_async::Stack;
//!# use std_embedded_time::StandardClock;
//!# use embedded_redis::commands::bgsave::BackgroundSaveCommand;
//!# use embedded_redis::network::{CommandErrors, ConnectionHandler};
//!#
//! let stack = Stack::default();
//! let clock = StandardClock::default();
//!
//! let mut connection_handler = ConnectionHandler::resp2(SocketAddr::from_str("127.0.0.1:6379").unwrap());
//! let client = connection_handler.connect(&stack, Some(&clock)).await.unwrap();
//!
//! let command = BackgroundSaveCommand::default();
//! let response = client.send(command).await;
//!# if let Err(error) = response {
//!#     assert!(matches!(error, CommandErrors::ErrorResponse(message)
//!#         if message.contains("Background save already in progress")));
//!# }
//! # });
//! ```
//! # Schedule option
//! Using `SCHEDULE` option by setting constructor flag to `true`.
//! ```
//! # async_std::task::block_on(async {
//!# use core::str::FromStr;
//!# use core::net::SocketAddr;
//!# use std_embedded_nal_async::Stack;
//!# use std_embedded_time::StandardClock;
//!# use embedded_redis::commands::bgsave::BackgroundSaveCommand;
//!# use embedded_redis::network::ConnectionHandler;
//!#
//!# let stack = Stack::default();
//!# let clock = StandardClock::default();
//!#
//!# let mut connection_handler = ConnectionHandler::resp2(SocketAddr::from_str("127.0.0.1:6379").unwrap());
//!# let client = connection_handler.connect(&stack, Some(&clock)).await.unwrap();
//!#
//! let command = BackgroundSaveCommand::new(true);
//! # });
//! ```
//! # Shorthand
//! [Client](Client#method.get) provides a shorthand method for this command.
//! ```
//! # async_std::task::block_on(async {
//!# use core::str::FromStr;
//!# use core::net::SocketAddr;
//!# use std_embedded_nal_async::Stack;
//!# use std_embedded_time::StandardClock;
//!# use embedded_redis::network::{CommandErrors, ConnectionHandler};
//!#
//!# let stack = Stack::default();
//!# let clock = StandardClock::default();
//!#
//!# let mut connection_handler = ConnectionHandler::resp2(SocketAddr::from_str("127.0.0.1:6379").unwrap());
//!# let client = connection_handler.connect(&stack, Some(&clock)).await.unwrap();
//!#
//! let response = client.bgsave(false).await;
//!# if let Err(error) = response {
//!#     assert!(matches!(error, CommandErrors::ErrorResponse(message)
//!#         if message.contains("Background save already in progress")));
//!# }
//! # });
//! ```
use crate::commands::auth::AuthCommand;
use crate::commands::builder::CommandBuilder;
use crate::commands::hello::HelloCommand;
use crate::commands::{Command, ResponseTypeError};
use crate::network::protocol::Protocol;
use crate::network::{Client, CommandErrors};
use bytes::Bytes;
use embedded_io_async::{Read, Write};
use embedded_time::Clock;

static SCHEDULE_OPTION: Bytes = Bytes::from_static(b"SCHEDULE");

/// Abstraction ob BGSAVE command
#[derive(Default)]
pub struct BackgroundSaveCommand {
    /// If BGSAVE SCHEDULE is used, the command will immediately return OK when an AOF rewrite is
    /// in progress and schedule the background save to run at the next opportunity.
    schedule: bool,
}

impl BackgroundSaveCommand {
    pub fn new(schedule: bool) -> Self {
        Self { schedule }
    }
}

impl<F: From<CommandBuilder>> Command<F> for BackgroundSaveCommand {
    type Response = ();

    fn encode(&self) -> F {
        let builder = CommandBuilder::new("BGSAVE");

        if self.schedule {
            return builder.arg(&SCHEDULE_OPTION).into();
        }

        builder.into()
    }

    fn eval_response(&self, _: F) -> Result<Self::Response, ResponseTypeError> {
        Ok(())
    }
}

impl<'a, T: Read + Write, C: Clock, P: Protocol> Client<'a, T, C, P>
where
    AuthCommand: Command<<P as Protocol>::FrameType>,
    HelloCommand: Command<<P as Protocol>::FrameType>,
{
    /// Shorthand for [BackgroundSaveCommand]
    pub async fn bgsave(&self, schedule: bool) -> Result<(), CommandErrors>
    where
        <P as Protocol>::FrameType: From<CommandBuilder>,
    {
        self.send(BackgroundSaveCommand::new(schedule)).await
    }
}