Kea 2.7.0
agent/parser_context.cc
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1// Copyright (C) 2017-2021 Internet Systems Consortium, Inc. ("ISC")
2//
3// This Source Code Form is subject to the terms of the Mozilla Public
4// License, v. 2.0. If a copy of the MPL was not distributed with this
5// file, You can obtain one at http://mozilla.org/MPL/2.0/.
6
7#include <config.h>
8
10#include <agent/agent_parser.h>
11#include <agent/ca_log.h>
14#include <cc/data.h>
15#include <fstream>
16#include <sstream>
17#include <limits>
18
19namespace isc {
20namespace agent {
21
23 : sfile_(0), ctx_(NO_KEYWORDS), trace_scanning_(false), trace_parsing_(false)
24{
25}
26
30
32ParserContext::parseString(const std::string& str, ParserType parser_type)
33{
34 scanStringBegin(str, parser_type);
35 return (parseCommon());
36}
37
39ParserContext::parseFile(const std::string& filename, ParserType parser_type) {
40 FILE* f = fopen(filename.c_str(), "r");
41 if (!f) {
42 isc_throw(ParseError, "Unable to open file " << filename);
43 }
44 scanFileBegin(f, filename, parser_type);
45 return (parseCommon());
46}
47
49ParserContext::parseCommon() {
50 isc::agent::AgentParser parser(*this);
51 // Uncomment this to get detailed parser logs.
52 // trace_parsing_ = true;
53 parser.set_debug_level(trace_parsing_);
54 try {
55 int res = parser.parse();
56 if (res != 0) {
57 isc_throw(ParseError, "Parser abort");
58 }
59 scanEnd();
60 }
61 catch (...) {
62 scanEnd();
63 throw;
64 }
65 if (stack_.size() == 1) {
66 return (stack_[0]);
67 } else {
68 isc_throw(ParseError, "Expected exactly one terminal Element expected, found "
69 << stack_.size());
70 }
71}
72
73void
74ParserContext::error(const isc::agent::location& loc,
75 const std::string& what,
76 size_t pos)
77{
78 if (pos == 0) {
79 isc_throw(ParseError, loc << ": " << what);
80 } else {
81 isc_throw(ParseError, loc << " (near " << pos << "): " << what);
82 }
83}
84
85void
86ParserContext::error(const std::string& what)
87{
88 isc_throw(ParseError, what);
89}
90
91void
92ParserContext::fatal(const std::string& what)
93{
94 isc_throw(ParseError, what);
95}
96
98ParserContext::loc2pos(isc::agent::location& loc)
99{
100 const std::string& file = *loc.begin.filename;
101 const uint32_t line = loc.begin.line;
102 const uint32_t pos = loc.begin.column;
103 return (isc::data::Element::Position(file, line, pos));
104}
105
106void
107ParserContext::require(const std::string& name,
110{
111 ConstElementPtr value = stack_.back()->get(name);
112 if (!value) {
114 "missing parameter '" << name << "' ("
115 << stack_.back()->getPosition() << ") ["
116 << contextName() << " map between "
117 << open_loc << " and " << close_loc << "]");
118 }
119}
120
121void
122ParserContext::unique(const std::string& name,
124{
125 ConstElementPtr value = stack_.back()->get(name);
126 if (value) {
127 if (ctx_ != NO_KEYWORDS) {
128 isc_throw(ParseError, loc << ": duplicate " << name
129 << " entries in " << contextName()
130 << " map (previous at " << value->getPosition() << ")");
131 } else {
132 isc_throw(ParseError, loc << ": duplicate " << name
133 << " entries in JSON"
134 << " map (previous at " << value->getPosition() << ")");
135 }
136 }
137}
138
139void
141{
142 cstack_.push_back(ctx_);
143 ctx_ = ctx;
144}
145
146void
148{
149 if (cstack_.empty()) {
150 fatal("unbalanced syntactic context");
151 }
152 ctx_ = cstack_.back();
153 cstack_.pop_back();
154}
155
156const std::string
158{
159 switch (ctx_) {
160 case NO_KEYWORDS:
161 return ("__no keywords__");
162 case CONFIG:
163 return ("toplevel");
164 case AGENT:
165 return ("Control-agent");
166 case AUTHENTICATION:
167 return ("authentication");
168 case AUTH_TYPE:
169 return ("auth-type");
170 case CLIENTS:
171 return ("clients");
172 case CONTROL_SOCKETS:
173 return ("control-sockets");
174 case SERVER:
175 return ("xxx-server");
176 case SOCKET_TYPE:
177 return ("socket-type");
178 case HOOKS_LIBRARIES:
179 return ("hooks-libraries");
180 case LOGGERS:
181 return ("loggers");
182 case OUTPUT_OPTIONS:
183 return ("output-options");
184 default:
185 return ("__unknown__");
186 }
187}
188
189void
190ParserContext::warning(const isc::agent::location& loc,
191 const std::string& what) {
192 std::ostringstream msg;
193 msg << loc << ": " << what;
195 .arg(msg.str());
196}
197
198void
199ParserContext::warnAboutExtraCommas(const isc::agent::location& loc) {
200 warning(loc, "Extraneous comma. A piece of configuration may have been omitted.");
201}
202
203} // end of isc::eval namespace
204} // end of isc namespace
Define the isc::agent::parser class.
Evaluation error exception raised when trying to parse.
void warning(const isc::agent::location &loc, const std::string &what)
Warning handler.
void warnAboutExtraCommas(const isc::agent::location &loc)
Warning for extra commas.
void scanStringBegin(const std::string &str, ParserType type)
Method called before scanning starts on a string.
ParserContext()
Default constructor.
void scanFileBegin(FILE *f, const std::string &filename, ParserType type)
Method called before scanning starts on a file.
void unique(const std::string &name, isc::data::Element::Position loc)
Check if a parameter is already present.
std::vector< isc::data::ElementPtr > stack_
JSON elements being parsed.
static void fatal(const std::string &what)
Fatal error handler.
virtual ~ParserContext()
destructor
const std::string contextName()
Get the syntactic context name.
isc::data::Element::Position loc2pos(isc::agent::location &loc)
Converts bison's position to one understandable by isc::data::Element.
isc::data::ElementPtr parseFile(const std::string &filename, ParserType parser_type)
Run the parser on the file specified.
LexerContext ctx_
Current syntactic context.
isc::data::ElementPtr parseString(const std::string &str, ParserType parser_type)
Run the parser on the string specified.
void leave()
Leave a syntactic context.
LexerContext
Defines syntactic contexts for lexical tie-ins.
@ CONFIG
Used while parsing content of Agent.
@ SERVER
Used while parsing Control-agent/control-socket/*-server/socket-type.
@ NO_KEYWORDS
This one is used in pure JSON mode.
@ HOOKS_LIBRARIES
Used while parsing Control-agent/loggers structures.
@ CONTROL_SOCKETS
Used while parsing Control-agent/control-socket/*-server.
@ SOCKET_TYPE
Used while parsing Control-agent/hooks-libraries.
@ AGENT
Used while parsing Control-agent/Authentication.
@ CLIENTS
Used while parsing Control-agent/control-sockets.
@ AUTHENTICATION
Used while parsing Control-agent/Authentication/type.
@ AUTH_TYPE
Used while parsing Control-agent/Authentication/clients.
@ LOGGERS
Used while parsing Control-agent/loggers/output-options structures.
void require(const std::string &name, isc::data::Element::Position open_loc, isc::data::Element::Position close_loc)
Check if a required parameter is present.
void error(const isc::agent::location &loc, const std::string &what, size_t pos=0)
Error handler.
ParserType
Defines currently supported scopes.
void enter(const LexerContext &ctx)
Enter a new syntactic context.
void scanEnd()
Method called after the last tokens are scanned.
#define isc_throw(type, stream)
A shortcut macro to insert known values into exception arguments.
#define LOG_WARN(LOGGER, MESSAGE)
Macro to conveniently test warn output and log it.
Definition macros.h:26
const isc::log::MessageID CTRL_AGENT_CONFIG_SYNTAX_WARNING
Definition ca_messages.h:17
isc::log::Logger agent_logger("ctrl-agent")
Control Agent logger.
Definition ca_log.h:18
boost::shared_ptr< const Element > ConstElementPtr
Definition data.h:29
boost::shared_ptr< Element > ElementPtr
Definition data.h:28
Defines the logger used by the top-level component of kea-lfc.
Represents the position of the data element within a configuration string.
Definition data.h:94