mongodb 0.9.1

The official MongoDB driver for Rust (currently in alpha)
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

use std::sync::{Arc, RwLock};

use bson::{bson, doc};

use super::TestClient;
use crate::{
    event::{
        cmap::{CmapEventHandler, PoolClearedEvent},
        command::{
            CommandEventHandler,
            CommandFailedEvent,
            CommandStartedEvent,
            CommandSucceededEvent,
        },
    },
    test::LOCK,
    Collection,
};

pub type EventQueue<T> = Arc<RwLock<Vec<T>>>;

#[derive(Debug)]
pub enum CommandEvent {
    CommandStartedEvent(CommandStartedEvent),
    CommandSucceededEvent(CommandSucceededEvent),
    CommandFailedEvent(CommandFailedEvent),
}

impl CommandEvent {
    fn command_name(&self) -> &str {
        match self {
            CommandEvent::CommandStartedEvent(event) => event.command_name.as_str(),
            CommandEvent::CommandFailedEvent(event) => event.command_name.as_str(),
            CommandEvent::CommandSucceededEvent(event) => event.command_name.as_str(),
        }
    }

    fn is_command_started(&self) -> bool {
        match self {
            CommandEvent::CommandStartedEvent(_) => true,
            _ => false,
        }
    }
}

#[derive(Default)]
pub struct EventHandler {
    pub command_events: EventQueue<CommandEvent>,
    pub pool_cleared_events: EventQueue<PoolClearedEvent>,
}

impl CmapEventHandler for EventHandler {
    fn handle_pool_cleared_event(&self, event: PoolClearedEvent) {
        self.pool_cleared_events.write().unwrap().push(event)
    }
}

impl CommandEventHandler for EventHandler {
    fn handle_command_started_event(&self, event: CommandStartedEvent) {
        self.command_events
            .write()
            .unwrap()
            .push(CommandEvent::CommandStartedEvent(event))
    }

    fn handle_command_failed_event(&self, event: CommandFailedEvent) {
        self.command_events
            .write()
            .unwrap()
            .push(CommandEvent::CommandFailedEvent(event))
    }

    fn handle_command_succeeded_event(&self, event: CommandSucceededEvent) {
        self.command_events
            .write()
            .unwrap()
            .push(CommandEvent::CommandSucceededEvent(event))
    }
}

pub struct EventClient {
    client: TestClient,
    pub command_events: EventQueue<CommandEvent>,
    pub pool_cleared_events: EventQueue<PoolClearedEvent>,
}

impl std::ops::Deref for EventClient {
    type Target = TestClient;

    fn deref(&self) -> &Self::Target {
        &self.client
    }
}

impl std::ops::DerefMut for EventClient {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.client
    }
}

impl EventClient {
    pub fn new() -> Self {
        let handler = EventHandler::default();
        let command_events = handler.command_events.clone();
        let pool_cleared_events = handler.pool_cleared_events.clone();
        let client = TestClient::with_handler(Some(handler));

        Self {
            client,
            command_events,
            pool_cleared_events,
        }
    }

    pub fn run_operation_with_events(
        &self,
        command_names: &[&str],
        database_name: &str,
        collection_name: &str,
        function: impl FnOnce(Collection),
    ) -> Vec<CommandEvent> {
        function(self.database(database_name).collection(collection_name));
        self.command_events
            .write()
            .unwrap()
            .drain(..)
            .filter(|event| command_names.contains(&event.command_name()))
            .collect()
    }
}

#[test]
fn command_started_event_count() {
    let _guard = LOCK.run_concurrently();

    let client = EventClient::new();
    let coll = client.database("foo").collection("bar");

    for i in 0..10 {
        coll.insert_one(doc! { "x": i }, None).unwrap();
    }

    assert_eq!(
        client
            .command_events
            .read()
            .unwrap()
            .iter()
            .filter(|event| event.is_command_started() && event.command_name() == "insert")
            .count(),
        10
    );
}