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

crate::ix!();

/**
  | Different types of connections to a
  | peer. This enum encapsulates the information
  | we have available at the time of opening
  | or accepting the connection. Aside
  | from INBOUND, all types are initiated
  | by us.
  | 
  | If adding or removing types, please
  | update CONNECTION_TYPE_DOC in src/rpc/net.cpp
  | and src/qt/rpcconsole.cpp, as well
  | as the descriptions in src/qt/guiutil.cpp
  | and src/bitcoin-cli.cpp::NetinfoRequestHandler.
  |
  */
#[derive(Copy,Clone,PartialEq,Eq)]
pub enum ConnectionType {

    /**
      | Inbound connections are those initiated
      | by a peer. This is the only property we
      | know at the time of connection, until
      | 
      | P2P messages are exchanged.
      |
      */
    INBOUND,

    /**
      | These are the default connections that
      | we use to connect with the network. There
      | is no restriction on what is relayed;
      | by default we relay blocks, addresses
      | & transactions. We automatically attempt
      | to open
      | 
      | MAX_OUTBOUND_FULL_RELAY_CONNECTIONS
      | using addresses from our AddrMan.
      |
      */
    OUTBOUND_FULL_RELAY,

    /**
      | We open manual connections to addresses
      | that users explicitly requested via
      | the addnode RPC or the -addnode/-connect
      | configuration options. Even if a manual
      | connection is misbehaving, we do not
      | automatically disconnect or add it
      | to our discouragement filter.
      |
      */
    MANUAL,

    /**
      | Feeler connections are short-lived
      | connections made to check that a node
      | is alive. They can be useful for:
      | 
      | - test-before-evict: if one of the peers
      | is considered for eviction from our
      | AddrMan because another peer is mapped
      | to the same slot in the tried table, evict
      | only if this longer-known peer is offline.
      | 
      | - move node addresses from New to Tried
      | table, so that we have more connectable
      | addresses in our AddrMan.
      | 
      | -----------
      | @note
      | 
      | in the literature ("Eclipse Attacks
      | on Bitcoin’s Peer-to-Peer Network")
      | only the latter feature is referred
      | to as "feeler connections", although
      | in our codebase feeler connections
      | encompass test-before-evict as well.
      | 
      | We make these connections approximately
      | every FEELER_INTERVAL: first we resolve
      | previously found collisions if they
      | exist (test-before-evict), otherwise
      | we connect to a node from the new table.
      |
      */
    FEELER,

    /** 
      | We use block-relay-only connections to
      | help prevent against partition attacks.
      |
      | By not relaying transactions or addresses,
      | these connections are harder to detect by
      | a third party, thus helping obfuscate the
      | network topology. 
      |
      | We automatically attempt to open
      | MAX_BLOCK_RELAY_ONLY_ANCHORS using
      | addresses from our anchors.dat. 
      |
      | Then addresses from our AddrMan if
      | MAX_BLOCK_RELAY_ONLY_CONNECTIONS isn't
      | reached yet.
      |
      */
    BLOCK_RELAY,

    /**
      | AddrFetch connections are short lived
      | connections used to solicit addresses
      | from peers. These are initiated to addresses
      | submitted via the -seednode command line 
      | argument, or under certain conditions when the
      | AddrMan is empty.
      |
      */
    ADDR_FETCH,
}

impl Default for ConnectionType {

    fn default() -> Self {
        todo!();
    }
}

/**
  | Convert ConnectionType enum to a string
  | value
  |
  */
pub fn connection_type_as_string(conn_type: ConnectionType) -> String {
    
    todo!();
        /*
            switch (conn_type) {
        case ConnectionType::INBOUND:
            return "inbound";
        case ConnectionType::MANUAL:
            return "manual";
        case ConnectionType::FEELER:
            return "feeler";
        case ConnectionType::OUTBOUND_FULL_RELAY:
            return "outbound-full-relay";
        case ConnectionType::BLOCK_RELAY:
            return "block-relay-only";
        case ConnectionType::ADDR_FETCH:
            return "addr-fetch";
        } // no default case, so the compiler can warn about missing cases

        assert(false);
        */
}