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

use crate::dht::peer::VirtualPeer;
use crate::dht::{ChordStorage, Did, PeerRingAction};
use crate::err::{Error, Result};
use crate::message::payload::{MessageRelay, MessageRelayMethod};
use crate::message::protocol::MessageSessionRelayProtocol;
use crate::message::types::{FoundVNode, Message, SearchVNode, StoreVNode, SyncVNodeWithSuccessor};
use crate::message::MessageHandler;

use async_trait::async_trait;

#[cfg_attr(feature = "wasm", async_trait(?Send))]
#[cfg_attr(not(feature = "wasm"), async_trait)]
pub trait TChordStorage {
    async fn search_vnode(
        &self,
        relay: MessageRelay<Message>,
        prev: Did,
        msg: SearchVNode,
    ) -> Result<()>;

    async fn found_vnode(
        &self,
        relay: MessageRelay<Message>,
        prev: Did,
        msg: FoundVNode,
    ) -> Result<()>;

    async fn store_vnode(
        &self,
        relay: MessageRelay<Message>,
        prev: Did,
        msg: StoreVNode,
    ) -> Result<()>;

    async fn sync_with_successor(
        &self,
        relay: MessageRelay<Message>,
        prev: Did,
        msg: SyncVNodeWithSuccessor,
    ) -> Result<()>;
}

#[cfg_attr(feature = "wasm", async_trait(?Send))]
#[cfg_attr(not(feature = "wasm"), async_trait)]
impl TChordStorage for MessageHandler {
    async fn search_vnode(
        &self,
        relay: MessageRelay<Message>,
        prev: Did,
        msg: SearchVNode,
    ) -> Result<()> {
        let dht = self.dht.lock().await;
        let mut relay = relay.clone();
        relay.push_prev(dht.id, prev);
        match dht.lookup(msg.target_id) {
            Ok(action) => match action {
                PeerRingAction::None => Ok(()),
                PeerRingAction::SomeVNode(v) => {
                    self.send_message(
                        &prev.into(),
                        Some(relay.from_path),
                        Some(relay.to_path),
                        MessageRelayMethod::REPORT,
                        Message::FoundVNode(FoundVNode {
                            target_id: v.did(),
                            data: v.data,
                        }),
                    )
                    .await
                }
                PeerRingAction::RemoteAction(next, _) => {
                    self.send_message(
                        &next.into(),
                        Some(relay.to_path),
                        Some(relay.from_path),
                        MessageRelayMethod::SEND,
                        Message::SearchVNode(SearchVNode {
                            sender_id: msg.sender_id,
                            target_id: msg.target_id,
                        }),
                    )
                    .await
                }
                act => Err(Error::PeerRingUnexpectedAction(act)),
            },
            Err(e) => Err(e),
        }
    }

    async fn found_vnode(
        &self,
        relay: MessageRelay<Message>,
        prev: Did,
        msg: FoundVNode,
    ) -> Result<()> {
        let dht = self.dht.lock().await;
        let mut relay = relay.clone();
        relay.push_prev(dht.id, prev);
        if !relay.to_path.is_empty() {
            self.send_message(
                &prev.into(),
                Some(relay.to_path),
                Some(relay.from_path),
                MessageRelayMethod::REPORT,
                Message::FoundVNode(msg.clone()),
            )
            .await
        } else {
            // found vnode and TODO
            Ok(())
        }
    }

    async fn store_vnode(
        &self,
        relay: MessageRelay<Message>,
        prev: Did,
        msg: StoreVNode,
    ) -> Result<()> {
        let dht = self.dht.lock().await;
        let mut relay = relay.clone();
        relay.push_prev(dht.id, prev);
        let virtual_peer = VirtualPeer {
            address: msg.sender_id,
            data: msg.data.clone(),
        };
        match dht.store(virtual_peer) {
            Ok(action) => match action {
                PeerRingAction::None => Ok(()),
                PeerRingAction::RemoteAction(next, _) => {
                    self.send_message(
                        &next.into(),
                        Some(relay.to_path),
                        Some(relay.from_path),
                        MessageRelayMethod::SEND,
                        Message::StoreVNode(msg.clone()),
                    )
                    .await
                }
                act => Err(Error::PeerRingUnexpectedAction(act)),
            },
            Err(e) => Err(e),
        }
    }

    async fn sync_with_successor(
        &self,
        _relay: MessageRelay<Message>,
        _prev: Did,
        _msg: SyncVNodeWithSuccessor,
    ) -> Result<()> {
        Ok(())
    }
}