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
|
// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package simulation
import (
"context"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p"
)
// PeerEvent is the type of the channel returned by Simulation.PeerEvents.
type PeerEvent struct {
// NodeID is the ID of node that the event is caught on.
NodeID discover.NodeID
// Event is the event that is caught.
Event *p2p.PeerEvent
// Error is the error that may have happened during event watching.
Error error
}
// PeerEventsFilter defines a filter on PeerEvents to exclude messages with
// defined properties. Use PeerEventsFilter methods to set required options.
type PeerEventsFilter struct {
t *p2p.PeerEventType
protocol *string
msgCode *uint64
}
// NewPeerEventsFilter returns a new PeerEventsFilter instance.
func NewPeerEventsFilter() *PeerEventsFilter {
return &PeerEventsFilter{}
}
// Type sets the filter to only one peer event type.
func (f *PeerEventsFilter) Type(t p2p.PeerEventType) *PeerEventsFilter {
f.t = &t
return f
}
// Protocol sets the filter to only one message protocol.
func (f *PeerEventsFilter) Protocol(p string) *PeerEventsFilter {
f.protocol = &p
return f
}
// MsgCode sets the filter to only one msg code.
func (f *PeerEventsFilter) MsgCode(c uint64) *PeerEventsFilter {
f.msgCode = &c
return f
}
// PeerEvents returns a channel of events that are captured by admin peerEvents
// subscription nodes with provided NodeIDs. Additional filters can be set to ignore
// events that are not relevant.
func (s *Simulation) PeerEvents(ctx context.Context, ids []discover.NodeID, filters ...*PeerEventsFilter) <-chan PeerEvent {
eventC := make(chan PeerEvent)
for _, id := range ids {
s.shutdownWG.Add(1)
go func(id discover.NodeID) {
defer s.shutdownWG.Done()
client, err := s.Net.GetNode(id).Client()
if err != nil {
eventC <- PeerEvent{NodeID: id, Error: err}
return
}
events := make(chan *p2p.PeerEvent)
sub, err := client.Subscribe(ctx, "admin", events, "peerEvents")
if err != nil {
eventC <- PeerEvent{NodeID: id, Error: err}
return
}
defer sub.Unsubscribe()
for {
select {
case <-ctx.Done():
if err := ctx.Err(); err != nil {
select {
case eventC <- PeerEvent{NodeID: id, Error: err}:
case <-s.Done():
}
}
return
case <-s.Done():
return
case e := <-events:
match := len(filters) == 0 // if there are no filters match all events
for _, f := range filters {
if f.t != nil && *f.t != e.Type {
continue
}
if f.protocol != nil && *f.protocol != e.Protocol {
continue
}
if f.msgCode != nil && e.MsgCode != nil && *f.msgCode != *e.MsgCode {
continue
}
// all filter parameters matched, break the loop
match = true
break
}
if match {
select {
case eventC <- PeerEvent{NodeID: id, Event: e}:
case <-ctx.Done():
if err := ctx.Err(); err != nil {
select {
case eventC <- PeerEvent{NodeID: id, Error: err}:
case <-s.Done():
}
}
return
case <-s.Done():
return
}
}
case err := <-sub.Err():
if err != nil {
select {
case eventC <- PeerEvent{NodeID: id, Error: err}:
case <-ctx.Done():
if err := ctx.Err(); err != nil {
select {
case eventC <- PeerEvent{NodeID: id, Error: err}:
case <-s.Done():
}
}
return
case <-s.Done():
return
}
}
}
}
}(id)
}
return eventC
}
|
