-
Notifications
You must be signed in to change notification settings - Fork 14
/
DlepClient.h
281 lines (255 loc) · 12.4 KB
/
DlepClient.h
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
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
* Dynamic Link Exchange Protocol (DLEP)
*
* Copyright (C) 2015, 2016, 2019 Massachusetts Institute of Technology
*/
/// @file
/// This is the abstract interface that the DLEP client (library user)
/// must present to the DLEP service (library).
/// I.e., the DLEP client implements this interface and the
/// DLEP service calls it.
/// Clients should include this file indirectly by including DlepInit.h.
#ifndef DLEP_CLIENT_H
#define DLEP_CLIENT_H
#include <boost/variant.hpp>
#include <boost/asio.hpp> // for ip::address
#include <vector>
#include "DlepCommon.h"
namespace LLDLEP
{
/// This is the abstract interface that the DLEP client (library user)
/// must present to the DLEP service (library).
///
/// At library initialization time (DlepInit), the client passes a
/// pointer to an object that implements the DlepClient interface.
/// The DLEP library calls these methods to get information from the
/// client or notify the client of events related to the DLEP
/// protocol. The DLEP client subclasses from this class and
/// implements all of the required methods. The DLEP library calls
/// these methods from its own internal threads, distinct from the
/// client's threads. The client must be prepared for this, possibly
/// implementing mutex mechanisms as appropriate.
class DlepClient
{
public:
/// Possible types for configuration parameter values.
typedef boost::variant < bool,
unsigned int,
std::string,
boost::asio::ip::address,
std::vector<unsigned int>
> ConfigValue;
// There is an overloaded get_config_parameter method for each parameter
// type that can be returned. I could probably do this more elegantly
// with templates.
/// Get a configuration parameter of any type defined in ConfigValue.
/// @param[in] parameter_name
/// the name of the parameter to retrieve
/// @param[out] value
/// place to store the parameter's value
/// @throw BadParameterName if parameter_name does not exist
virtual void get_config_parameter(const std::string & parameter_name,
ConfigValue * value) = 0;
/// Get a boolean configuration parameter.
/// @param[in] parameter_name
/// the name of the parameter to retrieve
/// @param[out] value
/// place to store the parameter's value
/// @throw BadParameterName if parameter_name does not exist
virtual void get_config_parameter(const std::string & parameter_name,
bool * value) = 0;
/// Get an unsigned int configuration parameter.
/// @param[in] parameter_name
/// the name of the parameter to retrieve
/// @param[out] value
/// place to store the parameter's value
/// @throw BadParameterName if parameter_name does not exist
virtual void get_config_parameter(const std::string & parameter_name,
unsigned int * value) = 0;
/// Get a string configuration parameter.
/// @param[in] parameter_name
/// the name of the parameter to retrieve
/// @param[out] value
/// place to store the parameter's value
/// @throw BadParameterName if parameter_name does not exist
virtual void get_config_parameter(const std::string & parameter_name,
std::string * value) = 0;
/// Get an IP address (v4 or v6) configuration parameter.
/// @param[in] parameter_name
/// the name of the parameter to retrieve
/// @param[out] value
/// place to store the parameter's value
/// @throw BadParameterName if parameter_name does not exist
virtual void get_config_parameter(const std::string & parameter_name,
boost::asio::ip::address * value) = 0;
/// Get a vector<unsigned int> configuration parameter.
/// @param[in] parameter_name
/// the name of the parameter to retrieve
/// @param[out] value
/// place to store the parameter's value
/// @throw BadParameterName if parameter_name does not exist
virtual void get_config_parameter(const std::string & parameter_name,
std::vector<unsigned int> * value) = 0;
/// Exception class for get_config_parameter methods.
class BadParameterName : public std::runtime_error
{
public:
/// Name of the parameter that did not exist.
std::string parameter_name;
explicit BadParameterName(const std::string & pn) :
runtime_error("Missing value for parameter " + pn),
parameter_name(pn) {}
};
/// Give the client a chance to modify the data items sent during
/// session establishment.
///
/// @param[in] peer_id
/// uniquely identifies the peer
/// @param[in] data_items
/// Proposed data items that will be sent to the peer.
/// If Dlep is configured as a router, these data
/// items are sent in a Session Initialization message.
/// If Dlep is configured as a modem, these data
/// items are sent in a Session Initialization Response
/// message. The client can add, change, or remove any
/// data items from the list.
/// @return
/// true if the data_items were modified, else false
virtual bool peer_init(const std::string & peer_id,
DataItems & data_items) {return false;}
/// Notify the client that a new peer session is up.
/// @param[in] peer_info
/// contains detailed information about the peer
virtual void peer_up(const LLDLEP::PeerInfo & peer_info) = 0;
/// Notify the client that a peer has been updated.
/// @param[in] peer_id
/// uniquely identifies the peer
/// @param[in] data_items
/// Data items that have changed for this peer
virtual void peer_update(const std::string & peer_id,
const DataItems & data_items) = 0;
/// Notify the client that the peer session is down.
/// @param[in] peer_id
/// uniquely identifies the peer
virtual void peer_down(const std::string & peer_id) = 0;
/// Notify the client that a new destination from the peer is up.
/// @param[in] peer_id
/// the peer reporting on the destination
/// @param[in] mac_address
/// the destination that is up. If this represents a
/// multicast address, the modem should begin sending
/// traffic for this address to the router.
/// @param[in] data_items
/// data_items associated with the destination
///
/// @return
/// A ProtocolString from ProtocolConfig.h specifying the status to
/// put in the Destination Up Response message. Plausible values:
/// - "" (empty string) to omit sending status (interpreted as Success)
/// - ProtocolStrings::Success if all is well
/// - ProtocolStrings::Not_Interested to tell the peer to refrain
/// from sending further messages about this \p mac_address
virtual std::string destination_up(const std::string & peer_id,
const DlepMac & mac_address,
const DataItems & data_items) = 0;
/// Notify the client that an existing destination's
/// attributes have changed.
///
/// @param[in] peer_id
/// the peer reporting on the destination
/// @param[in] mac_address
/// the destination that is being updated
/// @param[in] data_items
/// data_items associated with the destination
virtual void destination_update(const std::string & peer_id,
const DlepMac & mac_address,
const DataItems & data_items) = 0;
/// Notify the client that an existing destination from the peer is down.
/// @param[in] peer_id
/// the peer reporting on the destination
/// @param[in] mac_address
/// the destination that is down. If this represents a
/// multicast address, the modem should cease sending
/// traffic for this address to the router.
/// @param[in] data_items
/// data_items associated with the destination
virtual void destination_down(const std::string & peer_id,
const DlepMac & mac_address,
const DataItems & data_items) = 0;
/// Request that the client establish specific link characteristics
/// for a destination.
///
/// This is called when a Link Characteristics Request signal is
/// received with a non-empty list of metrics. If a Link
/// Characteristics Request signal is received that contains an
/// empty list of metrics, it is interpreted as a request for all
/// of the current metrics for \p mac_address. In this case, the
/// response is sent automatically by DlepService without calling
/// this method.
///
/// See DlepClient::linkchar_reply() for the complete sequence of events
/// in a link characteristics request/response transacation.
///
/// @param[in] peer_id
/// the peer making the request
/// @param[in] mac_address
/// the destination for which link characteristics are requested.
/// This must be a destination originating from the client
/// side, not from the peer.
/// @param[in] data_items
/// Contains any subset of the metrics defined by the
/// Link Characteristics Request signal of DLEP draft
/// or any configured extensions. The client should
/// reconfigure the link to \p mac_address to have
/// these requested metric values. When the new metric
/// values have taken effect, the client inform the
/// peer by calling DlepService::linkchar_reply().
///
virtual void linkchar_request(const std::string & peer_id,
const DlepMac & mac_address,
const DataItems & data_items) = 0;
/// Notify the client that a Link Characteristics Response signal was
/// received.
///
/// This is the final API call in the Link Characteristics
/// transaction. The complete sequence looks like this:
///
/// - Client calls DlepService::linkchar_request() to send the
/// request to the peer
/// - Link Characteristics Request goes over the wire and into the
/// peer's DlepService
/// - Peer is notified by a call to DlepClient::linkchar_request()
/// - Peer processes the linkchar request to assign the new metrics
/// - Peer calls DlepService::linkchar_reply() to send the response
/// to the client
/// - Link Characteristics Response goes over the wire and into the
/// client's DlepService
/// - Client is notified by a call to DlepClient::linkchar_reply()
/// (this method)
///
/// @param[in] peer_id
/// the peer sending the response
/// @param[in] mac_address
/// the destination to which the link characteristics in
/// \p data_items apply.
/// This must be a destination originating from the peer.
/// @param[in] data_items
/// Contains either:
/// - a full set of metrics for \p mac_address, if the original
/// linkchar request contained no data items, or
/// - the same subset of metrics that appeared in the Link
/// Characteristics Request signal to which this is a response.
/// The metric values are updated to reflect the state after
/// the peer processed the Link Characteristics Request.
/// If the peer was unable to establish one or more of the
/// requested metrics, the list will include a Status data
/// item with the status code Request Denied.
virtual void linkchar_reply(const std::string & peer_id,
const DlepMac & mac_address,
const DataItems & data_items) = 0;
protected:
DlepClient() {};
virtual ~DlepClient() {};
};
} // namespace LLDLEP
#endif // DLEP_CLIENT_H