rcommunity_core 0.0.3

Core facilities for crate `rcommunity`
Documentation 
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174

use std::marker::PhantomData;

use crate::{
    error::Result,
    markers::{ItemType, ReactionType, Storable, UserType},
    store::{Store, Transaction},
};

pub struct Reaction<TU, TI, TR>
where
    TU: UserType,
    TI: ItemType,
    TR: ReactionType,
{
    pub id: String,
    pub user: TU,
    pub item: TI,
    pub reaction: TR,
}

#[derive(Debug)]
pub struct UserItemUnboundedReactionClient<
    'store,
    TS: Store,
    TU: UserType,
    TI: ItemType,
    TR: ReactionType,
> {
    store: &'store mut TS,
    user: TU,
    item: TI,
    reaction_type: PhantomData<TR>,
}

impl<'store, TS: Store, TU: UserType, TI: ItemType, TR: ReactionType>
    UserItemUnboundedReactionClient<'store, TS, TU, TI, TR>
{
    /// Create a new reaction.
    ///
    /// # Errors
    /// Will return error when internal store failed.
    pub async fn react(&mut self, reaction: impl Into<TR>) -> Result<Reaction<TU, TI, TR>> {
        let mut txn = self.store.begin_txn().await?;
        let r = reaction.into();
        let rid = uuid::Uuid::new_v4().to_string(); // TODO: keep Uuid type
        r.store_reaction(&mut txn, &rid, &self.user, &self.item)
            .await?;
        r.store_unique_index(&mut txn, &rid, &self.user, &self.item)
            .await?;

        txn.commit().await?;

        Ok(Reaction {
            id: rid,
            user: self.user.clone(),
            item: self.item.clone(),
            reaction: r,
        })
    }
}

#[cfg(test)]
mod test {
    use std::marker::PhantomData;

    use crate::{
        markers::{ItemType, ReactionType, Serializable, UserType, ID},
        store::{memory::MemoryStore, Store, Transaction},
    };

    use super::UserItemUnboundedReactionClient;

    // test types
    #[derive(Clone, Debug)]
    struct User(String);
    impl ID for User {
        fn id(&self) -> &str {
            &self.0
        }
    }
    impl UserType for User {}
    #[derive(Clone, Debug)]
    struct Item(String);
    impl ID for Item {
        fn id(&self) -> &str {
            &self.0
        }
    }
    impl ItemType for Item {}

    #[derive(Copy, Clone, Debug)]
    enum Vote {
        Upvote,
        Downvote,
    }
    impl Serializable for Vote {
        fn serialize(&self) -> String {
            match *self {
                Vote::Upvote => "Upvote",
                Vote::Downvote => "Downvote",
            }
            .into()
        }
    }
    impl ReactionType for Vote {}

    #[derive(Clone, Debug)]
    struct Comment(String);
    impl ReactionType for Comment {}
    impl ItemType for Comment {}
    impl ID for Comment {
        fn id(&self) -> &str {
            &self.0
        }
    }

    #[tokio::test]
    async fn test_reaction() {
        let mut store = MemoryStore::default();
        let txn = store.begin_txn().await.unwrap();

        let mut client = UserItemUnboundedReactionClient {
            store: &mut store,
            user: User("1000".into()),
            item: Item("2000".into()),
            reaction_type: PhantomData::<Vote>,
        };
        let vote = client.react(Vote::Upvote).await.unwrap();

        // vote tests
        let value = txn
            .get(format!("Vote:User:1000:Item:2000:{}", vote.id))
            .await
            .unwrap()
            .unwrap();
        assert_eq!(&value, "Upvote");

        let value = txn
            .get("Vote:User:1000:Item:2000:Upvote".into())
            .await
            .unwrap();
        assert!(value.is_none());

        let vote = client.react(Vote::Downvote).await.unwrap();
        let value = txn
            .get(format!("Vote:User:1000:Item:2000:{}", vote.id))
            .await
            .unwrap()
            .unwrap();
        assert_eq!(&value, "Downvote");

        // comment tests
        let mut client = UserItemUnboundedReactionClient {
            store: &mut store,
            user: User("1000".into()),
            item: Item("2000".into()),
            reaction_type: PhantomData::<Comment>,
        };
        let comment = client.react(Comment("3000".into())).await.unwrap();

        let value = txn
            .get(format!("Comment:User:1000:Item:2000:{}", comment.id))
            .await
            .unwrap()
            .unwrap();
        assert_eq!(&value, "Comment:3000");
        let value = txn
            .get("Comment:User:1000:Item:2000:Comment:3000".into())
            .await
            .unwrap()
            .unwrap();
        assert_eq!(value, comment.id);
    }
}