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
|
// Copyright (C) 2017 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <cc/command_interpreter.h>
#include <config/base_command_mgr.h>
#include <config/config_log.h>
#include <boost/bind.hpp>
#include <set>
using namespace isc::data;
namespace isc {
namespace config {
BaseCommandMgr::BaseCommandMgr() {
registerCommand("list-commands", boost::bind(&BaseCommandMgr::listCommandsHandler,
this, _1, _2));
}
void
BaseCommandMgr::registerCommand(const std::string& cmd, CommandHandler handler) {
if (!handler) {
isc_throw(InvalidCommandHandler, "Specified command handler is NULL");
}
HandlerContainer::const_iterator it = handlers_.find(cmd);
if (it != handlers_.end()) {
isc_throw(InvalidCommandName, "Handler for command '" << cmd
<< "' is already installed.");
}
handlers_.insert(make_pair(cmd, handler));
LOG_DEBUG(command_logger, DBG_COMMAND, COMMAND_REGISTERED).arg(cmd);
}
void
BaseCommandMgr::deregisterCommand(const std::string& cmd) {
if (cmd == "list-commands") {
isc_throw(InvalidCommandName,
"Can't uninstall internal command 'list-commands'");
}
HandlerContainer::iterator it = handlers_.find(cmd);
if (it == handlers_.end()) {
isc_throw(InvalidCommandName, "Handler for command '" << cmd
<< "' not found.");
}
handlers_.erase(it);
LOG_DEBUG(command_logger, DBG_COMMAND, COMMAND_DEREGISTERED).arg(cmd);
}
void
BaseCommandMgr::deregisterAll() {
// No need to log anything here. deregisterAll is not used in production
// code, just in tests.
handlers_.clear();
registerCommand("list-commands",
boost::bind(&BaseCommandMgr::listCommandsHandler, this, _1, _2));
}
isc::data::ConstElementPtr
BaseCommandMgr::processCommand(const isc::data::ConstElementPtr& cmd) {
if (!cmd) {
return (createAnswer(CONTROL_RESULT_ERROR,
"Command processing failed: NULL command parameter"));
}
try {
ConstElementPtr arg;
std::string name = parseCommand(arg, cmd);
LOG_INFO(command_logger, COMMAND_RECEIVED).arg(name);
return (handleCommand(name, arg));
} catch (const Exception& e) {
LOG_WARN(command_logger, COMMAND_PROCESS_ERROR2).arg(e.what());
return (createAnswer(CONTROL_RESULT_ERROR,
std::string("Error during command processing: ")
+ e.what()));
}
}
ConstElementPtr
BaseCommandMgr::combineCommandsLists(const ConstElementPtr& response1,
const ConstElementPtr& response2) const {
// Usually when this method is called there should be two non-null
// responses. If there is just a single response, return this
// response.
if (!response1 && response2) {
return (response2);
} else if (response1 && !response2) {
return (response1);
} else if (!response1 && !response2) {
return (ConstElementPtr());
} else {
// Both responses are non-null so we need to combine the lists
// of supported commands if the status codes are 0.
int status_code;
ConstElementPtr args1 = parseAnswer(status_code, response1);
if (status_code != 0) {
return (response1);
}
ConstElementPtr args2 = parseAnswer(status_code, response2);
if (status_code != 0) {
return (response2);
}
const std::vector<ElementPtr> vec1 = args1->listValue();
const std::vector<ElementPtr> vec2 = args2->listValue();
// Storing command names in a set guarantees that the non-unique
// command names are aggregated.
std::set<std::string> combined_set;
for (auto v = vec1.cbegin(); v != vec1.cend(); ++v) {
combined_set.insert((*v)->stringValue());
}
for (auto v = vec2.cbegin(); v != vec2.cend(); ++v) {
combined_set.insert((*v)->stringValue());
}
// Create a combined list of commands.
ElementPtr combined_list = Element::createList();
for (auto s = combined_set.cbegin(); s != combined_set.cend(); ++s) {
combined_list->add(Element::create(*s));
}
return (createAnswer(CONTROL_RESULT_SUCCESS, combined_list));
}
}
ConstElementPtr
BaseCommandMgr::handleCommand(const std::string& cmd_name,
const ConstElementPtr& params) {
auto it = handlers_.find(cmd_name);
if (it == handlers_.end()) {
// Ok, there's no such command.
return (createAnswer(CONTROL_RESULT_ERROR,
"'" + cmd_name + "' command not supported."));
}
// Call the actual handler and return whatever it returned
return (it->second(cmd_name, params));
}
isc::data::ConstElementPtr
BaseCommandMgr::listCommandsHandler(const std::string& name,
const isc::data::ConstElementPtr& ) {
using namespace isc::data;
ElementPtr commands = Element::createList();
for (HandlerContainer::const_iterator it = handlers_.begin();
it != handlers_.end(); ++it) {
commands->add(Element::create(it->first));
}
return (createAnswer(CONTROL_RESULT_SUCCESS, commands));
}
} // namespace isc::config
} // namespace isc
|
