104 lines
3.0 KiB
Rust
104 lines
3.0 KiB
Rust
use bb8_redis::redis::cmd;
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pub use bb8_redis::redis::RedisError;
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pub use bb8_redis::{bb8, RedisConnectionManager};
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use std::time::Duration;
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// TODO: take this as an argument to open?
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const KEY_PREFIX: &str = "rate-limit";
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pub type RedisClientPool = bb8::Pool<RedisConnectionManager>;
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pub struct RedisCellClient {
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pool: RedisClientPool,
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key: String,
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max_burst: u32,
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count_per_period: u32,
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period: u32,
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}
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impl RedisCellClient {
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// todo: seems like this could be derived
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// TODO: take something generic for conn
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// TODO: use r2d2 for connection pooling?
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pub fn new(
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pool: bb8::Pool<RedisConnectionManager>,
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default_key: String,
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max_burst: u32,
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count_per_period: u32,
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period: u32,
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) -> Self {
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let default_key = format!("{}:{}", KEY_PREFIX, default_key);
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Self {
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pool,
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key: default_key,
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max_burst,
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count_per_period,
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period,
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}
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}
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#[inline]
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async fn _throttle(&self, key: &str, quantity: u32) -> Result<(), Duration> {
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let mut conn = self.pool.get().await.unwrap();
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/*
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https://github.com/brandur/redis-cell#response
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CL.THROTTLE <key> <max_burst> <count per period> <period> [<quantity>]
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0. Whether the action was limited:
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0 indicates the action is allowed.
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1 indicates that the action was limited/blocked.
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1. The total limit of the key (max_burst + 1). This is equivalent to the common X-RateLimit-Limit HTTP header.
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2. The remaining limit of the key. Equivalent to X-RateLimit-Remaining.
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3. The number of seconds until the user should retry, and always -1 if the action was allowed. Equivalent to Retry-After.
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4. The number of seconds until the limit will reset to its maximum capacity. Equivalent to X-RateLimit-Reset.
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*/
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// TODO: don't unwrap. maybe return anyhow::Result<Result<(), Duration>>
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// TODO: should we return more error info?
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let x: Vec<isize> = cmd("CL.THROTTLE")
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.arg(&(
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key,
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self.max_burst,
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self.count_per_period,
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self.period,
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quantity,
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))
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.query_async(&mut *conn)
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.await
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.unwrap();
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assert_eq!(x.len(), 5);
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// TODO: trace log the result
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let retry_after = *x.get(3).unwrap();
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if retry_after == -1 {
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Ok(())
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} else {
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Err(Duration::from_secs(retry_after as u64))
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}
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}
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#[inline]
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pub async fn throttle(&self) -> Result<(), Duration> {
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self._throttle(&self.key, 1).await
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}
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#[inline]
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pub async fn throttle_key(&self, key: &str) -> Result<(), Duration> {
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let key = format!("{}:{}", KEY_PREFIX, key);
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self._throttle(key.as_ref(), 1).await
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}
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#[inline]
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pub async fn throttle_quantity(&self, quantity: u32) -> Result<(), Duration> {
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self._throttle(&self.key, quantity).await
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}
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}
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