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
|
// Copyright 2017 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 simulations simulates p2p networks.
// A mokcer simulates starting and stopping real nodes in a network.
package simulations
import (
"encoding/json"
"net/http"
"net/url"
"strconv"
"sync"
"testing"
"time"
"github.com/ethereum/go-ethereum/p2p/enode"
)
func TestMocker(t *testing.T) {
//start the simulation HTTP server
_, s := testHTTPServer(t)
defer s.Close()
//create a client
client := NewClient(s.URL)
//start the network
err := client.StartNetwork()
if err != nil {
t.Fatalf("Could not start test network: %s", err)
}
//stop the network to terminate
defer func() {
err = client.StopNetwork()
if err != nil {
t.Fatalf("Could not stop test network: %s", err)
}
}()
//get the list of available mocker types
resp, err := http.Get(s.URL + "/mocker")
if err != nil {
t.Fatalf("Could not get mocker list: %s", err)
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
t.Fatalf("Invalid Status Code received, expected 200, got %d", resp.StatusCode)
}
//check the list is at least 1 in size
var mockerlist []string
err = json.NewDecoder(resp.Body).Decode(&mockerlist)
if err != nil {
t.Fatalf("Error decoding JSON mockerlist: %s", err)
}
if len(mockerlist) < 1 {
t.Fatalf("No mockers available")
}
nodeCount := 10
var wg sync.WaitGroup
events := make(chan *Event, 10)
var opts SubscribeOpts
sub, err := client.SubscribeNetwork(events, opts)
defer sub.Unsubscribe()
//wait until all nodes are started and connected
//store every node up event in a map (value is irrelevant, mimic Set datatype)
nodemap := make(map[enode.ID]bool)
wg.Add(1)
nodesComplete := false
connCount := 0
go func() {
for {
select {
case event := <-events:
//if the event is a node Up event only
if event.Node != nil && event.Node.Up {
//add the correspondent node ID to the map
nodemap[event.Node.Config.ID] = true
//this means all nodes got a nodeUp event, so we can continue the test
if len(nodemap) == nodeCount {
nodesComplete = true
//wait for 3s as the mocker will need time to connect the nodes
//time.Sleep( 3 *time.Second)
}
} else if event.Conn != nil && nodesComplete {
connCount += 1
if connCount == (nodeCount-1)*2 {
wg.Done()
return
}
}
case <-time.After(30 * time.Second):
wg.Done()
t.Fatalf("Timeout waiting for nodes being started up!")
}
}
}()
//take the last element of the mockerlist as the default mocker-type to ensure one is enabled
mockertype := mockerlist[len(mockerlist)-1]
//still, use hardcoded "probabilistic" one if available ;)
for _, m := range mockerlist {
if m == "probabilistic" {
mockertype = m
break
}
}
//start the mocker with nodeCount number of nodes
resp, err = http.PostForm(s.URL+"/mocker/start", url.Values{"mocker-type": {mockertype}, "node-count": {strconv.Itoa(nodeCount)}})
if err != nil {
t.Fatalf("Could not start mocker: %s", err)
}
if resp.StatusCode != 200 {
t.Fatalf("Invalid Status Code received for starting mocker, expected 200, got %d", resp.StatusCode)
}
wg.Wait()
//check there are nodeCount number of nodes in the network
nodes_info, err := client.GetNodes()
if err != nil {
t.Fatalf("Could not get nodes list: %s", err)
}
if len(nodes_info) != nodeCount {
t.Fatalf("Expected %d number of nodes, got: %d", nodeCount, len(nodes_info))
}
//stop the mocker
resp, err = http.Post(s.URL+"/mocker/stop", "", nil)
if err != nil {
t.Fatalf("Could not stop mocker: %s", err)
}
if resp.StatusCode != 200 {
t.Fatalf("Invalid Status Code received for stopping mocker, expected 200, got %d", resp.StatusCode)
}
//reset the network
_, err = http.Post(s.URL+"/reset", "", nil)
if err != nil {
t.Fatalf("Could not reset network: %s", err)
}
//now the number of nodes in the network should be zero
nodes_info, err = client.GetNodes()
if err != nil {
t.Fatalf("Could not get nodes list: %s", err)
}
if len(nodes_info) != 0 {
t.Fatalf("Expected empty list of nodes, got: %d", len(nodes_info))
}
}
|
