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use crate::{
Result,
client::{MonitorStream, PreparedCommand, prepare_command},
commands::{LMoveWhere, ZMPopResult, ZWhere},
resp::{Response, cmd, deserialize_vec_of_triplets},
};
use serde::{
Deserialize, Deserializer, Serialize,
de::{DeserializeOwned, Visitor},
};
use std::{fmt, marker::PhantomData};
/// Result for the [`bzpopmin`](BlockingCommands::bzpopmin)
/// and [`bzpopmax`](BlockingCommands::bzpopmax) commands
#[derive(Deserialize)]
pub struct BZpopMinMaxResult<K, E>(
#[serde(deserialize_with = "deserialize_bzop_min_max_result")] pub Option<Vec<(K, E, f64)>>,
)
where
K: DeserializeOwned,
E: DeserializeOwned;
#[allow(clippy::complexity)]
pub fn deserialize_bzop_min_max_result<'de, D, K, V>(
deserializer: D,
) -> std::result::Result<Option<Vec<(K, V, f64)>>, D::Error>
where
D: Deserializer<'de>,
K: DeserializeOwned,
V: DeserializeOwned,
{
struct OptionVisitor<K, V> {
phantom: PhantomData<(K, V)>,
}
impl<'de, K, V> Visitor<'de> for OptionVisitor<K, V>
where
K: DeserializeOwned,
V: DeserializeOwned,
{
type Value = Option<Vec<(K, V, f64)>>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("Option<Vec<(K, V, f64)>>")
}
fn visit_none<E>(self) -> std::result::Result<Self::Value, E>
where
E: serde::de::Error,
{
Ok(None)
}
fn visit_some<D>(self, deserializer: D) -> std::result::Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserialize_vec_of_triplets(deserializer).map(Some)
}
}
deserializer.deserialize_option(OptionVisitor {
phantom: PhantomData,
})
}
/// A group of blocking commands
pub trait BlockingCommands<'a>: Sized {
/// This command is the blocking variant of [`lmove`](crate::commands::ListCommands::lmove).
///
/// # Return
/// the element being popped from `source` and pushed to `destination`.
/// If timeout is reached, a None reply is returned.
///
/// # See Also
/// [<https://redis.io/commands/blmove/>](https://redis.io/commands/blmove/)
#[must_use]
fn blmove<R: Response>(
self,
source: impl Serialize,
destination: impl Serialize,
where_from: LMoveWhere,
where_to: LMoveWhere,
timeout: f64,
) -> PreparedCommand<'a, Self, R> {
prepare_command(
self,
cmd("BLMOVE")
.key(source)
.key(destination)
.arg(where_from)
.arg(where_to)
.arg(timeout),
)
}
/// This command is the blocking variant of [`lmpop`](crate::commands::ListCommands::lmpop).
///
/// # Return
/// - None when no element could be popped, and timeout is reached.
/// - Tuple composed by the name of the key from which elements were popped and the list of popped element
///
/// # See Also
/// [<https://redis.io/commands/blmpop/>](https://redis.io/commands/blmpop/)
#[must_use]
fn blmpop<R: Response + DeserializeOwned>(
self,
timeout: f64,
keys: impl Serialize,
where_: LMoveWhere,
count: usize,
) -> PreparedCommand<'a, Self, Option<(String, R)>> {
prepare_command(
self,
cmd("BLMPOP")
.arg(timeout)
.key_with_count(keys)
.arg(where_)
.arg("COUNT")
.arg(count),
)
}
/// This command is a blocking list pop primitive.
///
/// It is the blocking version of [`lpop`](crate::commands::ListCommands::lpop) because it
/// blocks the connection when there are no elements to pop from any of the given lists.
///
/// An element is popped from the head of the first list that is non-empty,
/// with the given keys being checked in the order that they are given.
///
/// # Return
/// - `None` when no element could be popped and the timeout expired
/// - a tuple with the first element being the name of the key where an element was popped
/// and the second element being the value of the popped element.
///
/// # See Also
/// [<https://redis.io/commands/blpop/>](https://redis.io/commands/blpop/)
#[must_use]
fn blpop<R1: Response + DeserializeOwned, R2: Response + DeserializeOwned>(
self,
keys: impl Serialize,
timeout: f64,
) -> PreparedCommand<'a, Self, Option<(R1, R2)>> {
prepare_command(self, cmd("BLPOP").key(keys).arg(timeout))
}
/// This command is a blocking list pop primitive.
///
/// It is the blocking version of [`rpop`](crate::commands::ListCommands::rpop) because it
/// blocks the connection when there are no elements to pop from any of the given lists.
///
/// An element is popped from the tail of the first list that is non-empty,
/// with the given keys being checked in the order that they are given.
///
/// # Return
/// - `None` when no element could be popped and the timeout expired
/// - a tuple with the first element being the name of the key where an element was popped
/// and the second element being the value of the popped element.
///
/// # See Also
/// [<https://redis.io/commands/brpop/>](https://redis.io/commands/brpop/)
#[must_use]
fn brpop<R1: Response + DeserializeOwned, R2: Response + DeserializeOwned>(
self,
keys: impl Serialize,
timeout: f64,
) -> PreparedCommand<'a, Self, Option<(R1, R2)>> {
prepare_command(self, cmd("BRPOP").key(keys).arg(timeout))
}
/// This command is the blocking variant of [`zmpop`](crate::commands::SortedSetCommands::zmpop).
///
/// # Return
/// * `None` if no element could be popped
/// * A tuple made up of
/// * The name of the key from which elements were popped
/// * An array of tuples with all the popped members and their scores
///
/// # See Also
/// [<https://redis.io/commands/bzmpop/>](https://redis.io/commands/bzmpop/)
#[must_use]
fn bzmpop<R: Response + DeserializeOwned>(
self,
timeout: f64,
keys: impl Serialize,
where_: ZWhere,
count: usize,
) -> PreparedCommand<'a, Self, Option<ZMPopResult<R>>> {
prepare_command(
self,
cmd("BZMPOP")
.arg(timeout)
.key_with_count(keys)
.arg(where_)
.arg("COUNT")
.arg(count),
)
}
/// This command is the blocking variant of [`zpopmax`](crate::commands::SortedSetCommands::zpopmax).
///
/// # Return
/// * `None` when no element could be popped and the timeout expired.
/// * The list of tuple with
/// * the first element being the name of the key where a member was popped,
/// * the second element is the popped member itself,
/// * and the third element is the score of the popped element.
///
/// # See Also
/// [<https://redis.io/commands/bzpopmax/>](https://redis.io/commands/bzpopmax/)
#[must_use]
fn bzpopmax<R1: Response + DeserializeOwned, R2: Response + DeserializeOwned>(
self,
keys: impl Serialize,
timeout: f64,
) -> PreparedCommand<'a, Self, BZpopMinMaxResult<R1, R2>> {
prepare_command(self, cmd("BZPOPMAX").key(keys).arg(timeout))
}
/// This command is the blocking variant of [`zpopmin`](crate::commands::SortedSetCommands::zpopmin).
///
/// # Return
/// * `None` when no element could be popped and the timeout expired.
/// * The list of tuple with
/// * the first element being the name of the key where a member was popped,
/// * the second element is the popped member itself,
/// * and the third element is the score of the popped element.
///
/// # See Also
/// [<https://redis.io/commands/bzpopmin/>](https://redis.io/commands/bzpopmin/)
#[must_use]
fn bzpopmin<R1: Response + DeserializeOwned, R2: Response + DeserializeOwned>(
self,
keys: impl Serialize,
timeout: f64,
) -> PreparedCommand<'a, Self, BZpopMinMaxResult<R1, R2>> {
prepare_command(self, cmd("BZPOPMIN").key(keys).arg(timeout))
}
/// Debugging command that streams back every command processed by the Redis server.
///
/// # See Also
/// [<https://redis.io/commands/monitor/>](https://redis.io/commands/monitor/)
#[must_use]
#[allow(async_fn_in_trait)]
async fn monitor(self) -> Result<MonitorStream>;
}