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

pub mod channel;
pub mod emoji;
pub mod guild;
pub mod integration;
pub mod interaction;
pub mod member;
pub mod message;
pub mod presence;
pub mod reaction;
pub mod role;
pub mod stage_instance;
pub mod sticker;
pub mod thread;
pub mod voice_state;

use crate::{config::ResourceType, InMemoryCache, UpdateCache};
use std::{borrow::Cow, collections::BTreeSet};
use twilight_model::{
    gateway::payload::incoming::{Ready, UnavailableGuild, UserUpdate},
    id::GuildId,
    user::{CurrentUser, User},
};

impl InMemoryCache {
    fn cache_current_user(&self, current_user: CurrentUser) {
        self.current_user
            .lock()
            .expect("current user poisoned")
            .replace(current_user);
    }

    pub(crate) fn cache_user(&self, user: Cow<'_, User>, guild_id: Option<GuildId>) {
        match self.users.get_mut(&user.id) {
            Some(u) if u.value() == user.as_ref() => {
                if let Some(guild_id) = guild_id {
                    self.user_guilds
                        .entry(user.id)
                        .or_default()
                        .insert(guild_id);
                }

                return;
            }
            Some(_) | None => {}
        }
        let user = user.into_owned();
        let user_id = user.id;

        self.users.insert(user_id, user);

        if let Some(guild_id) = guild_id {
            let mut guild_id_set = BTreeSet::new();
            guild_id_set.insert(guild_id);
            self.user_guilds.insert(user_id, guild_id_set);
        }
    }

    fn unavailable_guild(&self, guild_id: GuildId) {
        self.unavailable_guilds.insert(guild_id);
        self.guilds.remove(&guild_id);
    }
}

impl UpdateCache for Ready {
    fn update(&self, cache: &InMemoryCache) {
        if cache.wants(ResourceType::USER_CURRENT) {
            cache.cache_current_user(self.user.clone());
        }

        if cache.wants(ResourceType::GUILD) {
            for guild in &self.guilds {
                cache.unavailable_guild(guild.id);
            }
        }
    }
}

impl UpdateCache for UnavailableGuild {
    fn update(&self, cache: &InMemoryCache) {
        if !cache.wants(ResourceType::GUILD) {
            return;
        }

        cache.guilds.remove(&self.id);
        cache.unavailable_guilds.insert(self.id);
    }
}

impl UpdateCache for UserUpdate {
    fn update(&self, cache: &InMemoryCache) {
        if !cache.wants(ResourceType::USER_CURRENT) {
            return;
        }

        cache.cache_current_user(self.0.clone());
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::test;

    /// Test retrieval of the current user, notably that it doesn't simply
    /// panic or do anything funny. This is the only synchronous mutex that we
    /// might have trouble with across await points if we're not careful.
    #[test]
    fn test_current_user_retrieval() {
        let cache = InMemoryCache::new();
        assert!(cache.current_user().is_none());
        cache.cache_current_user(test::current_user(1));
        assert!(cache.current_user().is_some());
    }
}