dbeel 0.1.0

dbeel is a fast and minimal distributed thread-per-core document database.
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
175
176
177
178
179
180
181

use std::sync::Once;

use dbeel::{
    args::{parse_args_from, Args},
    error::Result,
    flow_events::FlowEvent,
    messages::NodeMetadata,
};
use rstest::{fixture, rstest};
use serial_test::serial;
use test_utils::{
    install_logger, next_node_args, subscribe_to_flow_events, test_node,
    test_node_ex, test_shard, wait_for_flow_events,
};

static ONCE: Once = Once::new();

fn create_metadata_from_args(
    args: Args,
    number_of_shards: u16,
) -> NodeMetadata {
    NodeMetadata {
        name: args.name,
        ip: args.ip,
        remote_shard_base_port: args.remote_shard_port,
        ids: (0..number_of_shards).collect::<Vec<_>>(),
        gossip_port: args.gossip_port,
        db_port: args.port,
    }
}

#[fixture]
fn args() -> Args {
    ONCE.call_once(|| {
        install_logger();
    });

    // Remove the test directory if it exists.
    let _ = std::fs::remove_dir_all("/tmp/test");
    parse_args_from([
        "",
        "--dir",
        "/tmp/test",
        "--remote-shard-connect-timeout",
        "500",
        "--remote-shard-read-timeout",
        "500",
        "--remote-shard-write-timeout",
        "500",
    ])
}

#[rstest]
#[serial]
fn clean_state(args: Args) -> Result<()> {
    test_shard(args, |shard| async move {
        assert!(shard.nodes.borrow().is_empty());
    })
}

fn node_discovery_and_shutdown_detect_(
    args: Args,
    crash_at_shutdown: bool,
) -> Result<()> {
    let number_of_shards_first_node = 2u16;
    let number_of_shards_second_node = 2u16;

    let (seed_sender, seed_receiver) = async_channel::bounded(1);
    let (second_up_sender, second_up_receiver) = async_channel::bounded(1);
    let (first_test_done_sender, first_test_done_receiver) =
        async_channel::bounded(1);

    let first_handle = test_node(
        number_of_shards_first_node,
        args.clone(),
        move |node_shard, other_shards| async move {
            let mut all_shards = other_shards.clone();
            all_shards.push(node_shard.clone());

            let all_shards_alive_node_gossip_events = subscribe_to_flow_events(
                &all_shards,
                FlowEvent::AliveNodeGossip,
            );
            let all_second_node_dead_events = subscribe_to_flow_events(
                &all_shards,
                FlowEvent::DeadNodeRemoved,
            );

            seed_sender
                .send(vec![format!(
                    "{}:{}",
                    node_shard.args.ip,
                    node_shard.args.remote_shard_port + node_shard.id
                )])
                .await
                .unwrap();

            let second_args = second_up_receiver.recv().await.unwrap();
            wait_for_flow_events(all_shards_alive_node_gossip_events)
                .await
                .unwrap();

            let second_node = create_metadata_from_args(
                second_args,
                number_of_shards_second_node,
            );

            for shard in &all_shards {
                assert_eq!(shard.nodes.borrow().len(), 1);
                assert_eq!(
                    shard.nodes.borrow().get(&second_node.name).unwrap(),
                    &second_node
                );
            }

            first_test_done_sender.send(()).await.unwrap();
            wait_for_flow_events(all_second_node_dead_events)
                .await
                .unwrap();

            for shard in &all_shards {
                assert!(shard.nodes.borrow().is_empty());
            }
        },
    )?;

    let seed_nodes = seed_receiver.recv_blocking()?;

    let mut second_args = next_node_args(
        args.clone(),
        "second".to_string(),
        number_of_shards_first_node,
    );
    second_args.seed_nodes = seed_nodes;

    let second_handle = test_node_ex(
        number_of_shards_second_node,
        second_args.clone(),
        crash_at_shutdown,
        move |node_shard, other_shards| async move {
            let mut all_shards = other_shards.clone();
            all_shards.push(node_shard.clone());

            second_up_sender.send(second_args).await.unwrap();

            let first_node =
                create_metadata_from_args(args, number_of_shards_first_node);

            for shard in &all_shards {
                assert_eq!(shard.nodes.borrow().len(), 1);
                assert_eq!(
                    shard.nodes.borrow().get(&first_node.name).unwrap(),
                    &first_node
                );
            }

            first_test_done_receiver.recv().await.unwrap();
        },
    )?;

    second_handle.join()?;
    first_handle.join()?;

    Ok(())
}

#[rstest]
#[serial]
fn node_discovery_and_shutdown_detect(args: Args) -> Result<()> {
    node_discovery_and_shutdown_detect_(args, false)
}

#[rstest]
#[serial]
fn node_discovery_and_crash_detect(mut args: Args) -> Result<()> {
    args.remote_shard_port += 4;
    args.port += 4;
    args.gossip_port += 4;
    args.failure_detection_interval = 10;
    node_discovery_and_shutdown_detect_(args, true)
}