1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142

use {
    crate::{
        bucket::Bucket, bucket_item::BucketItem, bucket_map::BucketMapError,
        bucket_stats::BucketMapStats, MaxSearch, RefCount,
    },
    solana_sdk::pubkey::Pubkey,
    std::{
        ops::RangeBounds,
        path::PathBuf,
        sync::{
            atomic::{AtomicU64, Ordering},
            Arc, RwLock, RwLockWriteGuard,
        },
    },
};

type LockedBucket<T> = RwLock<Option<Bucket<T>>>;

pub struct BucketApi<T: Clone + Copy> {
    drives: Arc<Vec<PathBuf>>,
    max_search: MaxSearch,
    pub stats: Arc<BucketMapStats>,

    bucket: LockedBucket<T>,
    count: Arc<AtomicU64>,
}

impl<T: Clone + Copy> BucketApi<T> {
    pub fn new(
        drives: Arc<Vec<PathBuf>>,
        max_search: MaxSearch,
        stats: Arc<BucketMapStats>,
    ) -> Self {
        Self {
            drives,
            max_search,
            stats,
            bucket: RwLock::default(),
            count: Arc::default(),
        }
    }

    /// Get the items for bucket
    pub fn items_in_range<R>(&self, range: &Option<&R>) -> Vec<BucketItem<T>>
    where
        R: RangeBounds<Pubkey>,
    {
        self.bucket
            .read()
            .unwrap()
            .as_ref()
            .map(|bucket| bucket.items_in_range(range))
            .unwrap_or_default()
    }

    /// Get the Pubkeys
    pub fn keys(&self) -> Vec<Pubkey> {
        self.bucket
            .read()
            .unwrap()
            .as_ref()
            .map_or_else(Vec::default, |bucket| bucket.keys())
    }

    /// Get the values for Pubkey `key`
    pub fn read_value(&self, key: &Pubkey) -> Option<(Vec<T>, RefCount)> {
        self.bucket.read().unwrap().as_ref().and_then(|bucket| {
            bucket
                .read_value(key)
                .map(|(value, ref_count)| (value.to_vec(), ref_count))
        })
    }

    pub fn bucket_len(&self) -> u64 {
        self.count.load(Ordering::Relaxed)
    }

    pub fn delete_key(&self, key: &Pubkey) {
        let mut bucket = self.get_write_bucket();
        if let Some(bucket) = bucket.as_mut() {
            bucket.delete_key(key)
        }
    }

    fn get_write_bucket(&self) -> RwLockWriteGuard<Option<Bucket<T>>> {
        let mut bucket = self.bucket.write().unwrap();
        if bucket.is_none() {
            *bucket = Some(Bucket::new(
                Arc::clone(&self.drives),
                self.max_search,
                Arc::clone(&self.stats),
                Arc::clone(&self.count),
            ));
        } else {
            let write = bucket.as_mut().unwrap();
            write.handle_delayed_grows();
        }
        bucket
    }

    pub fn addref(&self, key: &Pubkey) -> Option<RefCount> {
        self.get_write_bucket()
            .as_mut()
            .and_then(|bucket| bucket.addref(key))
    }

    pub fn unref(&self, key: &Pubkey) -> Option<RefCount> {
        self.get_write_bucket()
            .as_mut()
            .and_then(|bucket| bucket.unref(key))
    }

    pub fn insert(&self, pubkey: &Pubkey, value: (&[T], RefCount)) {
        let mut bucket = self.get_write_bucket();
        bucket.as_mut().unwrap().insert(pubkey, value)
    }

    pub fn grow(&self, err: BucketMapError) {
        // grows are special - they get a read lock and modify 'reallocated'
        // the grown changes are applied the next time there is a write lock taken
        if let Some(bucket) = self.bucket.read().unwrap().as_ref() {
            bucket.grow(err)
        }
    }

    pub fn update<F>(&self, key: &Pubkey, updatefn: F)
    where
        F: FnMut(Option<(&[T], RefCount)>) -> Option<(Vec<T>, RefCount)>,
    {
        let mut bucket = self.get_write_bucket();
        bucket.as_mut().unwrap().update(key, updatefn)
    }

    pub fn try_write(
        &self,
        pubkey: &Pubkey,
        value: (&[T], RefCount),
    ) -> Result<(), BucketMapError> {
        let mut bucket = self.get_write_bucket();
        bucket.as_mut().unwrap().try_write(pubkey, value.0, value.1)
    }
}