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use crate::{
client::{PreparedCommand, prepare_command},
resp::{Response, cmd},
};
use serde::{Deserialize, Serialize};
/// A group of Redis commands related to [`Count-min Sketch`](https://redis.io/docs/stack/bloom/)
///
/// # See Also
/// [Count-min Sketch Commands](https://redis.io/commands/?group=cms)
pub trait CountMinSketchCommands<'a>: Sized {
/// Increases the count of item by increment.
///
/// Multiple items can be increased with one call.
///
/// # Arguments
/// * `key` - The name of the sketch.
/// * `items` - A collection of tuples of
/// * `item` - The item which counter is to be increased.
/// * `increment`- Amount by which the item counter is to be increased.
///
/// # Return
/// A collection of count of each item after increment.
///
/// # See Also
/// * [<https://redis.io/commands/cms.incrby/>](https://redis.io/commands/cms.incrby/)
#[must_use]
fn cms_incrby<R: Response>(
self,
key: impl Serialize,
items: impl Serialize,
) -> PreparedCommand<'a, Self, R> {
prepare_command(self, cmd("CMS.INCRBY").key(key).arg(items))
}
/// Returns width, depth and total count of the sketch.
///
/// # Arguments
/// * `key` - The name of the sketch.
///
/// # See Also
/// * [<https://redis.io/commands/cms.info/>](https://redis.io/commands/cms.info/)
#[must_use]
fn cms_info(self, key: impl Serialize) -> PreparedCommand<'a, Self, CmsInfoResult> {
prepare_command(self, cmd("CMS.INFO").key(key))
}
/// Initializes a Count-Min Sketch to dimensions specified by user.
///
/// Multiple items can be increased with one call.
///
/// # Arguments
/// * `key` - The name of the sketch.
/// * `width` - Number of counters in each array. Reduces the error size.
/// * `depth` - Number of counter-arrays. Reduces the probability for an error of a certain size (percentage of total count).
///
/// # See Also
/// * [<https://redis.io/commands/cms.initbydim/>](https://redis.io/commands/cms.initbydim/)
#[must_use]
fn cms_initbydim(
self,
key: impl Serialize,
width: usize,
depth: usize,
) -> PreparedCommand<'a, Self, ()> {
prepare_command(self, cmd("CMS.INITBYDIM").key(key).arg(width).arg(depth))
}
/// Initializes a Count-Min Sketch to accommodate requested tolerances.
///
/// # Arguments
/// * `key` - The name of the sketch.
/// * `error` - Estimate size of error.\
/// The error is a percent of total counted items. This effects the width of the sketch.
/// * `probability` - The desired probability for inflated count. \
/// This should be a decimal value between 0 and 1.
/// This effects the depth of the sketch.
/// For example, for a desired false positive rate of 0.1% (1 in 1000),
/// error_rate should be set to 0.001. The closer this number is to zero,
/// the greater the memory consumption per item and the more CPU usage per operation.
///
/// # See Also
/// * [<https://redis.io/commands/cms.initbyprob/>](https://redis.io/commands/cms.initbyprob/)
#[must_use]
fn cms_initbyprob(
self,
key: impl Serialize,
error: f64,
probability: f64,
) -> PreparedCommand<'a, Self, ()> {
prepare_command(
self,
cmd("CMS.INITBYPROB").key(key).arg(error).arg(probability),
)
}
/// Returns the count for one or more items in a sketch.
///
/// All sketches must have identical width and depth.
/// Weights can be used to multiply certain sketches.
/// Default weight is 1.
///
/// # Arguments
/// * `destination` - The name of destination sketch. Must be initialized.
/// * `sources` - Names of source sketches to be merged.
/// * `weights` - Multiple of each sketch. Default = 1.
///
/// # See Also
/// * [<https://redis.io/commands/cms.merge/>](https://redis.io/commands/cms.merge/)
#[must_use]
fn cms_merge(
self,
destination: impl Serialize,
sources: impl Serialize,
weights: Option<impl Serialize>,
) -> PreparedCommand<'a, Self, ()> {
prepare_command(
self,
cmd("CMS.MERGE")
.key(destination)
.key_with_count(sources)
.arg(weights.map(|w| ("WEIGHTS", w))),
)
}
/// Merges several sketches into one sketch.
///
/// All sketches must have identical width and depth.
/// Weights can be used to multiply certain sketches.
/// Default weight is 1.
///
/// # Arguments
/// * `key` - The name of the sketch.
/// * `item` - One or more items for which to return the count.
///
/// # Return
/// Count of one or more items
///
/// # See Also
/// * [<https://redis.io/commands/cms.query/>](https://redis.io/commands/cms.query/)
#[must_use]
fn cms_query<R: Response>(
self,
key: impl Serialize,
items: impl Serialize,
) -> PreparedCommand<'a, Self, R> {
prepare_command(self, cmd("CMS.QUERY").key(key).arg(items))
}
}
/// Result for the [`cms_info`](CountMinSketchCommands::cms_info) command.
#[derive(Debug, Deserialize)]
pub struct CmsInfoResult {
/// Width of the sketch
pub width: usize,
/// Depth of the sketch
pub depth: usize,
/// Total count of the sketch
#[serde(rename = "count")]
pub total_count: usize,
}