summaryrefslogtreecommitdiffstats
path: root/examples/cmd/simple-client/simple_client.go
blob: b9e8052993338b51c8b12982473633e42d31cef1 (plain)
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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
// Copyright (c) 2017 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// simple-client is an example VPP management application that exercises the
// govpp API on real-world use-cases.
package main

import (
	"fmt"
	"net"
	"os"
	"strings"

	"git.fd.io/govpp.git"
	"git.fd.io/govpp.git/api"
	"git.fd.io/govpp.git/examples/bin_api/acl"
	"git.fd.io/govpp.git/examples/bin_api/interfaces"
	"git.fd.io/govpp.git/examples/bin_api/ip"
)

func main() {
	fmt.Println("Starting simple VPP client...")

	// connect to VPP
	conn, err := govpp.Connect("")
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(1)
	}
	defer conn.Disconnect()

	// create an API channel that will be used in the examples
	ch, err := conn.NewAPIChannel()
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(1)
	}
	defer ch.Close()

	// individual examples
	aclVersion(ch)
	aclConfig(ch)
	aclDump(ch)

	interfaceDump(ch)
	ipAddressDump(ch)

	setIpUnnumbered(ch)
	ipUnnumberedDump(ch)

	interfaceNotifications(ch)
}

// aclVersion is the simplest API example - one empty request message and one reply message.
func aclVersion(ch api.Channel) {
	req := &acl.ACLPluginGetVersion{}
	reply := &acl.ACLPluginGetVersionReply{}

	err := ch.SendRequest(req).ReceiveReply(reply)

	if err != nil {
		fmt.Println("Error:", err)
	} else {
		fmt.Printf("%+v\n", reply)
	}
}

// aclConfig is another simple API example - in this case, the request contains structured data.
func aclConfig(ch api.Channel) {
	req := &acl.ACLAddReplace{
		ACLIndex: ^uint32(0),
		Tag:      []byte("access list 1"),
		R: []acl.ACLRule{
			{
				IsPermit:       1,
				SrcIPAddr:      net.ParseIP("10.0.0.0").To4(),
				SrcIPPrefixLen: 8,
				DstIPAddr:      net.ParseIP("192.168.1.0").To4(),
				DstIPPrefixLen: 24,
				Proto:          6,
			},
			{
				IsPermit:       1,
				SrcIPAddr:      net.ParseIP("8.8.8.8").To4(),
				SrcIPPrefixLen: 32,
				DstIPAddr:      net.ParseIP("172.16.0.0").To4(),
				DstIPPrefixLen: 16,
				Proto:          6,
			},
		},
	}
	reply := &acl.ACLAddReplaceReply{}

	err := ch.SendRequest(req).ReceiveReply(reply)

	if err != nil {
		fmt.Println("Error:", err)
		return
	}
	if reply.Retval != 0 {
		fmt.Println("Retval:", reply.Retval)
		return
	}

	fmt.Printf("%+v\n", reply)

}

// aclDump shows an example where SendRequest and ReceiveReply are not chained together.
func aclDump(ch api.Channel) {
	req := &acl.ACLDump{}
	reply := &acl.ACLDetails{}

	if err := ch.SendRequest(req).ReceiveReply(reply); err != nil {
		fmt.Println("Error:", err)
	} else {
		fmt.Printf("%+v\n", reply)
	}
}

// interfaceDump shows an example of multipart request (multiple replies are expected).
func interfaceDump(ch api.Channel) {
	fmt.Println("Dumping interfaces")

	req := &interfaces.SwInterfaceDump{}
	reqCtx := ch.SendMultiRequest(req)

	for {
		msg := &interfaces.SwInterfaceDetails{}
		stop, err := reqCtx.ReceiveReply(msg)
		if stop {
			break // break out of the loop
		}
		if err != nil {
			fmt.Println("ERROR:", err)
		}
		ifaceName := strings.TrimFunc(string(msg.InterfaceName), func(r rune) bool {
			return r == 0x00
		})
		fmt.Printf("Interface: %q %+v\n", ifaceName, msg)
	}
}

func ipAddressDump(ch api.Channel) {
	fmt.Println("Dumping IP addresses")

	req := &ip.IPAddressDump{
		SwIfIndex: 1, //^uint32(0),
	}
	reqCtx := ch.SendMultiRequest(req)

	for {
		msg := &ip.IPAddressDetails{}
		stop, err := reqCtx.ReceiveReply(msg)
		if stop {
			break // break out of the loop
		}
		if err != nil {
			fmt.Println("ERROR:", err)
		}
		fmt.Printf("ip address: %d %+v\n", msg.SwIfIndex, msg)
	}
}

// aclDump shows an example where SendRequest and ReceiveReply are not chained together.
func setIpUnnumbered(ch api.Channel) {
	req := &interfaces.SwInterfaceSetUnnumbered{
		SwIfIndex:           1,
		UnnumberedSwIfIndex: 2,
		IsAdd:               1,
	}
	reply := &interfaces.SwInterfaceSetUnnumberedReply{}

	if err := ch.SendRequest(req).ReceiveReply(reply); err != nil {
		fmt.Println("Error:", err)
	} else {
		fmt.Printf("%+v\n", reply)
	}
}

func ipUnnumberedDump(ch api.Channel) {
	fmt.Println("Dumping IP unnumbered")

	req := &ip.IPUnnumberedDump{
		SwIfIndex: ^uint32(0),
	}
	reqCtx := ch.SendMultiRequest(req)

	for {
		msg := &ip.IPUnnumberedDetails{}
		stop, err := reqCtx.ReceiveReply(msg)
		if stop {
			break // break out of the loop
		}
		if err != nil {
			fmt.Println("ERROR:", err)
		}
		fmt.Printf("ip unnumbered: %+v\n", msg)
	}
}

// interfaceNotifications shows the usage of notification API. Note that for notifications,
// you are supposed to create your own Go channel with your preferred buffer size. If the channel's
// buffer is full, the notifications will not be delivered into it.
func interfaceNotifications(ch api.Channel) {
	// subscribe for specific notification message
	notifChan := make(chan api.Message, 100)
	subs, err := ch.SubscribeNotification(notifChan, interfaces.NewSwInterfaceEvent)
	if err != nil {
		panic(err)
	}

	// enable interface events in VPP
	err = ch.SendRequest(&interfaces.WantInterfaceEvents{
		PID:           uint32(os.Getpid()),
		EnableDisable: 1,
	}).ReceiveReply(&interfaces.WantInterfaceEventsReply{})
	if err != nil {
		panic(err)
	}

	// generate some events in VPP
	err = ch.SendRequest(&interfaces.SwInterfaceSetFlags{
		SwIfIndex:   0,
		AdminUpDown: 0,
	}).ReceiveReply(&interfaces.SwInterfaceSetFlagsReply{})
	if err != nil {
		panic(err)
	}
	err = ch.SendRequest(&interfaces.SwInterfaceSetFlags{
		SwIfIndex:   0,
		AdminUpDown: 1,
	}).ReceiveReply(&interfaces.SwInterfaceSetFlagsReply{})
	if err != nil {
		panic(err)
	}

	// receive one notification
	notif := (<-notifChan).(*interfaces.SwInterfaceEvent)
	fmt.Printf("NOTIF: %+v\n", notif)

	// disable interface events in VPP
	err = ch.SendRequest(&interfaces.WantInterfaceEvents{
		PID:           uint32(os.Getpid()),
		EnableDisable: 0,
	}).ReceiveReply(&interfaces.WantInterfaceEventsReply{})
	if err != nil {
		panic(err)
	}

	// unsubscribe from delivery of the notifications
	err = ch.UnsubscribeNotification(subs)
	if err != nil {
		panic(err)
	}
}