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use fxhash::FxHashMap; use fxhash::FxHashSet; use crate::domain::DOMAIN_MAX_LENGTH; use crate::Domain; use std::sync::Arc; use std::hash::{Hash, Hasher}; use parking_lot::Mutex; const DEFAULT_SHARDS: usize = 1024; type DefaultHasher = std::collections::hash_map::RandomState; pub type DomainSetShardedDefault = DomainSetSharded<DefaultHasher>; #[derive(Clone)] pub struct DomainSetSharded<H: std::hash::BuildHasher> { shards: Vec<Arc<Mutex<DomainSet>>>, hasher: H, } impl Default for DomainSetSharded<DefaultHasher> { fn default() -> Self { Self::new() } } impl DomainSetSharded<DefaultHasher> { pub fn new() -> Self { Self::with_shards_and_hasher(DEFAULT_SHARDS, DefaultHasher::new()) } pub fn with_shards(shard_count: usize) -> Self { Self::with_shards_and_hasher(shard_count, DefaultHasher::new()) } } impl<T: std::hash::BuildHasher> DomainSetSharded<T> { pub fn with_shards_and_hasher(shard_count: usize, hasher: T) -> Self { let mut shards = Vec::with_capacity(shard_count); for _ in 0..shard_count { shards.push(Arc::new(Mutex::new(DomainSet::new()))); } Self { shards, hasher } } fn get_location(&self, data: &[u8]) -> usize { let mut hasher = self.hasher.build_hasher(); data.hash(&mut hasher); let hash = hasher.finish(); hash as usize % self.shards.len() } pub fn contains(&self, data: &[u8]) -> bool { assert!(data.len() < DOMAIN_MAX_LENGTH); self.shards[self.get_location(data)].lock().contains(data) } pub fn contains_str(&self, data: &str) -> bool { self.contains(data.as_bytes()) } pub fn insert(&self, data: &[u8]) -> bool { assert!(data.len() < DOMAIN_MAX_LENGTH); self.shards[self.get_location(data)].lock().insert(data) } pub fn insert_str(&self, data: &str) -> bool { self.insert(data.as_bytes()) } pub fn remove(&self, data: &[u8]) -> bool { assert!(data.len() < DOMAIN_MAX_LENGTH); self.shards[self.get_location(data)].lock().remove(data) } pub fn remove_str(&self, data: &str) -> bool { self.remove(data.as_bytes()) } pub fn into_iter(self) -> impl Iterator<Item = Vec<u8>> { self.shards.into_iter().flat_map(|shard| { let shard_iter = std::mem::take(&mut *shard.lock()); shard_iter.into_iter() }) } pub fn into_iter_string(self) -> impl Iterator<Item = String> { self.into_iter() .filter_map(|element| String::from_utf8(element).ok()) } pub fn into_iter_domains(self) -> impl Iterator<Item = Domain> { self.into_iter_string() .filter_map(|slice| slice.parse::<Domain>().ok()) } pub fn shrink_to_fit(&self) { for shard in self.shards.iter() { shard.lock().shrink_to_fit(); } } pub fn len(&self) -> usize { self.shards.iter().map(|shard| shard.lock().len()).sum() } pub fn is_empty(&self) -> bool { self.shards.iter().all(|shard| shard.lock().is_empty()) } } pub struct DomainSetIter<'a> { domain_set: &'a DomainSet, has_empty_string: bool, subset: usize, index: usize, } impl<'a> DomainSetIter<'a> { fn new(domain_set: &'a DomainSet) -> Self { Self { has_empty_string: domain_set.has_empty_string, domain_set, subset: 0, index: 0, } } } impl<'a> Iterator for DomainSetIter<'a> { type Item = &'a [u8]; fn next(&mut self) -> Option<Self::Item> { if self.has_empty_string { self.has_empty_string = false; Some(&[]) } else if self.subset < self.domain_set.subsets.len() { let subset = &self.domain_set.subsets[self.subset]; if self.index * (self.subset + 1) < subset.len() { let result = &subset[self.index * (self.subset + 1)..(self.index + 1) * (self.subset + 1)]; self.index += 1; Some(result) } else { self.subset += 1; self.index = 0; self.next() } } else { None } } } pub struct DomainSetIntoIter { domain_set: DomainSet, has_empty_string: bool, subset: usize, index: usize, } impl DomainSetIntoIter { fn new(domain_set: DomainSet) -> Self { Self { has_empty_string: domain_set.has_empty_string, domain_set, subset: 0, index: 0, } } } impl Iterator for DomainSetIntoIter { type Item = Vec<u8>; fn next(&mut self) -> Option<Self::Item> { if self.has_empty_string { self.has_empty_string = false; Some(Vec::new()) } else if self.subset < self.domain_set.subsets.len() { let subset = &self.domain_set.subsets[self.subset]; if self.index * (self.subset + 1) < subset.len() { let result = subset [self.index * (self.subset + 1)..(self.index + 1) * (self.subset + 1)] .to_vec(); self.index += 1; Some(result) } else { self.subset += 1; self.index = 0; self.next() } } else { None } } } #[derive(Clone)] pub struct DomainSet { subsets: [Vec<u8>; DOMAIN_MAX_LENGTH], has_empty_string: bool, } impl Default for DomainSet { fn default() -> Self { Self::new() } } impl DomainSet { pub fn new() -> Self { let mut subsets: [std::mem::MaybeUninit<Vec<u8>>; DOMAIN_MAX_LENGTH] = unsafe { std::mem::MaybeUninit::uninit().assume_init() }; for elem in &mut subsets { *elem = std::mem::MaybeUninit::new(Vec::new()); } Self { subsets: unsafe { std::mem::transmute::<_, _>(subsets) }, has_empty_string: false, } } fn find_index(&self, data: &[u8]) -> Result<usize, usize> { let len = data.len(); assert!(len != 0); let subset = &self.subsets[len - 1]; assert_eq!(subset.len() % len, 0); let chunk_count = subset.len() / len; if chunk_count == 0 { return Err(0); } let mut size = chunk_count; let mut base = 0; while size > 1 { let half = size / 2; let mid = base + half; let slice = &subset[mid * len..(mid + 1) * len]; let cmp = data.cmp(slice); base = if cmp == std::cmp::Ordering::Greater { base } else { mid }; size -= half; } let slice = &subset[base * len..(base + 1) * len]; let cmp = data.cmp(slice); if cmp == std::cmp::Ordering::Equal { Ok(base) } else { Err(base + (cmp == std::cmp::Ordering::Less) as usize) } } pub fn contains(&self, data: &[u8]) -> bool { if data.len() == 0 { self.has_empty_string } else { self.find_index(data).is_ok() } } pub fn contains_str(&self, data: &str) -> bool { self.contains(data.as_bytes()) } pub fn insert(&mut self, data: &[u8]) -> bool { let len = data.len(); if len == 0 { let old = self.has_empty_string; self.has_empty_string = true; !self.has_empty_string } else if let Err(index) = self.find_index(data) { let subset = &mut self.subsets[len - 1]; let removed: Vec<_> = subset .splice(index * len..index * len, data.iter().cloned()) .collect(); assert_eq!(removed.len(), 0); true } else { false } } pub fn insert_str(&mut self, data: &str) -> bool { self.insert(data.as_bytes()) } pub fn remove(&mut self, data: &[u8]) -> bool { let len = data.len(); if len == 0 { let old = self.has_empty_string; self.has_empty_string = false; self.has_empty_string } else if let Ok(index) = self.find_index(data) { let subset = &mut self.subsets[len - 1]; let removed: Vec<_> = subset .splice(index * len..(index + 1) * len, std::iter::empty()) .collect(); assert_eq!(removed.len(), len); true } else { false } } pub fn remove_str(&mut self, data: &str) -> bool { self.remove(data.as_bytes()) } pub fn iter(&self) -> impl Iterator<Item = &[u8]> { DomainSetIter::new(self) } pub fn into_iter(self) -> impl Iterator<Item = Vec<u8>> { DomainSetIntoIter::new(self) } pub fn into_iter_string(self) -> impl Iterator<Item = String> { self.into_iter() .filter_map(|slice| String::from_utf8(slice).ok()) } pub fn into_iter_domains(self) -> impl Iterator<Item = Domain> { self.into_iter_string() .filter_map(|slice| slice.parse::<Domain>().ok()) } pub fn shrink_to_fit(&mut self) { for subset in self.subsets.iter_mut() { subset.shrink_to_fit(); } } pub fn len(&self) -> usize { self.has_empty_string as usize + self .subsets .iter() .enumerate() .map(|(len, subset)| subset.len() / (len + 1)) .sum::<usize>() } pub fn is_empty(&self) -> bool { !self.has_empty_string && self.subsets.iter().all(|subset| subset.is_empty()) } } #[cfg(test)] mod tests { use super::*; #[quickcheck] fn test_sharded_into_iter_string_is_original(mut strings: Vec<String>) { let set = DomainSetSharded::default(); strings.retain(|string| string.len() < DOMAIN_MAX_LENGTH); for domain in strings.iter() { set.insert_str(&domain); } let mut generated = set.into_iter_string().collect::<Vec<_>>(); generated.sort(); strings.sort(); strings.dedup(); assert_eq!(strings, generated); } #[quickcheck] fn test_domain_set_into_iter_string_is_original(mut strings: Vec<String>) { let mut set = DomainSet::default(); strings.retain(|string| string.len() < DOMAIN_MAX_LENGTH); for domain in strings.iter() { set.insert_str(&domain); } let mut generated = set.into_iter_string().collect::<Vec<_>>(); generated.sort(); strings.sort(); strings.dedup(); assert_eq!(strings, generated); } #[quickcheck] fn test_into_iter_is_original(mut slices: Vec<Vec<u8>>) { let set = DomainSetSharded::default(); slices.retain(|string| string.len() < DOMAIN_MAX_LENGTH); for domain in slices.iter() { set.insert(&domain); } let mut generated = set.into_iter().collect::<Vec<_>>(); generated.sort(); slices.sort(); slices.dedup(); assert_eq!(slices, generated); } #[quickcheck] fn test_domain_set_iter_is_original(mut slices: Vec<Vec<u8>>) { let mut set = DomainSet::default(); slices.retain(|string| string.len() < DOMAIN_MAX_LENGTH); for domain in slices.iter() { set.insert(&domain); } let mut generated = set.iter().collect::<Vec<_>>(); generated.sort(); slices.sort(); slices.dedup(); assert_eq!(slices, generated); } #[test] fn test_domain_set_can_have_elements_removed() { let mut domains = vec!["google.com", "en.m.wikipedia.org", "example.tk"]; domains.sort(); let set = DomainSetSharded::default(); for domain in domains.iter() { set.insert_str(&domain); } set.insert_str("youtube.com"); assert_eq!(set.len(), 4); assert_eq!(set.contains_str("youtube.com"), true); set.remove_str("youtube.com"); assert_eq!(set.len(), 3); assert_eq!(set.contains_str("youtube.com"), false); let mut generated = set.into_iter_string().collect::<Vec<_>>(); generated.sort(); assert_eq!(domains, generated); } #[test] fn test_domain_set_can_multiple_sizes() { let mut domains = vec![ "", "e", "ex", "exa", "exam", "examp", "exampl", "example", "example.", "example.c", "example.co", "example.com", ]; domains.sort(); let set = DomainSetSharded::default(); for (i, domain) in domains.iter().enumerate() { assert_eq!(set.contains_str(&domain), false); assert_eq!(set.len(), i); set.insert_str(&domain); assert_eq!(set.contains_str(&domain), true); assert_eq!(set.len(), i + 1); } let mut generated = set.into_iter_string().collect::<Vec<_>>(); generated.sort(); assert_eq!(domains, generated); } #[test] fn test_domain_set_removes_duplicates() { let mut domains = vec![ "google.com", "en.m.wikipedia.org", "example.tk", "google.com", ]; let set = DomainSetSharded::default(); for domain in domains.iter() { set.insert_str(&domain); } let mut generated = set.into_iter_string().collect::<Vec<_>>(); generated.sort(); domains.sort(); domains.dedup(); assert_eq!(domains, generated); } }