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12471842 PL |
1 | /* |
2 | * This file is part of PowerDNS or dnsdist. | |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
e8c59f2d | 22 | #pragma once |
ab3e8a6c BH |
23 | #include <boost/function.hpp> |
24 | #include <boost/any.hpp> | |
a1dfcec8 | 25 | #include <boost/shared_array.hpp> |
0bff046b BH |
26 | #include <boost/tuple/tuple.hpp> |
27 | #include <boost/tuple/tuple_comparison.hpp> | |
ac3da0c2 RG |
28 | #include <boost/multi_index_container.hpp> |
29 | #include <boost/multi_index/ordered_index.hpp> | |
30 | #include <boost/multi_index/hashed_index.hpp> | |
31 | #include <boost/multi_index/key_extractors.hpp> | |
0bff046b | 32 | #include <vector> |
ab3e8a6c BH |
33 | #include <map> |
34 | #include <stdexcept> | |
35 | #include <string> | |
f1d51ff7 | 36 | #include <sys/time.h> |
ab3e8a6c | 37 | |
ac3da0c2 RG |
38 | using namespace ::boost::multi_index; |
39 | ||
ab3e8a6c BH |
40 | class FDMultiplexerException : public std::runtime_error |
41 | { | |
42 | public: | |
43 | FDMultiplexerException(const std::string& str) : std::runtime_error(str) | |
44 | {} | |
45 | }; | |
46 | ||
a1dfcec8 BH |
47 | |
48 | /** Very simple FD multiplexer, based on callbacks and boost::any parameters | |
49 | As a special service, this parameter is kept around and can be modified, | |
50 | allowing for state to be stored inside the multiplexer. | |
51 | ||
52 | It has some "interesting" semantics | |
53 | */ | |
1f4abb20 | 54 | |
ab3e8a6c BH |
55 | class FDMultiplexer |
56 | { | |
d8f6d49f | 57 | public: |
d8f6d49f | 58 | typedef boost::any funcparam_t; |
d0ae6360 | 59 | typedef boost::function< void(int, funcparam_t&) > callbackfunc_t; |
ab3e8a6c | 60 | protected: |
d8f6d49f | 61 | |
ab3e8a6c BH |
62 | struct Callback |
63 | { | |
64 | callbackfunc_t d_callback; | |
ac3da0c2 | 65 | mutable funcparam_t d_parameter; |
0bff046b | 66 | struct timeval d_ttd; |
ac3da0c2 | 67 | int d_fd; |
ab3e8a6c BH |
68 | }; |
69 | ||
70 | public: | |
71 | FDMultiplexer() : d_inrun(false) | |
72 | {} | |
73 | virtual ~FDMultiplexer() | |
74 | {} | |
75 | ||
4226cfd0 | 76 | static FDMultiplexer* getMultiplexerSilent(); |
77 | ||
0e663c3b RG |
78 | /* tv will be updated to 'now' before run returns */ |
79 | /* timeout is in ms */ | |
dd9c8246 RG |
80 | /* returns 0 on timeout, -1 in case of error (but all implementations |
81 | actually throw in that case) and the number of ready events otherwise */ | |
0e663c3b | 82 | virtual int run(struct timeval* tv, int timeout=500) = 0; |
ab3e8a6c | 83 | |
dd9c8246 | 84 | /* timeout is in ms, 0 will return immediately, -1 will block until at least one FD is ready */ |
5bdbb83d RG |
85 | virtual void getAvailableFDs(std::vector<int>& fds, int timeout) = 0; |
86 | ||
a1dfcec8 | 87 | //! Add an fd to the read watch list - currently an fd can only be on one list at a time! |
27ae2e3c | 88 | virtual void addReadFD(int fd, callbackfunc_t toDo, const funcparam_t& parameter=funcparam_t(), const struct timeval* ttd=nullptr) |
ab3e8a6c | 89 | { |
27ae2e3c | 90 | this->addFD(d_readCallbacks, fd, toDo, parameter, ttd); |
ab3e8a6c BH |
91 | } |
92 | ||
a1dfcec8 | 93 | //! Add an fd to the write watch list - currently an fd can only be on one list at a time! |
702b1925 | 94 | virtual void addWriteFD(int fd, callbackfunc_t toDo, const funcparam_t& parameter=funcparam_t(), const struct timeval* ttd=nullptr) |
ab3e8a6c | 95 | { |
702b1925 | 96 | this->addFD(d_writeCallbacks, fd, toDo, parameter, ttd); |
ab3e8a6c BH |
97 | } |
98 | ||
a1dfcec8 | 99 | //! Remove an fd from the read watch list. You can't call this function on an fd that is closed already! |
6dcd28c3 | 100 | /** WARNING: references to 'parameter' become invalid after this function! */ |
ab3e8a6c BH |
101 | virtual void removeReadFD(int fd) |
102 | { | |
a1dfcec8 | 103 | this->removeFD(d_readCallbacks, fd); |
ab3e8a6c BH |
104 | } |
105 | ||
a1dfcec8 | 106 | //! Remove an fd from the write watch list. You can't call this function on an fd that is closed already! |
6dcd28c3 | 107 | /** WARNING: references to 'parameter' become invalid after this function! */ |
a1dfcec8 | 108 | virtual void removeWriteFD(int fd) |
ab3e8a6c | 109 | { |
a1dfcec8 | 110 | this->removeFD(d_writeCallbacks, fd); |
ab3e8a6c BH |
111 | } |
112 | ||
0bff046b BH |
113 | virtual void setReadTTD(int fd, struct timeval tv, int timeout) |
114 | { | |
27ae2e3c RG |
115 | const auto& it = d_readCallbacks.find(fd); |
116 | if (it == d_readCallbacks.end()) { | |
0bff046b | 117 | throw FDMultiplexerException("attempt to timestamp fd not in the multiplexer"); |
27ae2e3c RG |
118 | } |
119 | ||
ac3da0c2 | 120 | auto newEntry = *it; |
0bff046b | 121 | tv.tv_sec += timeout; |
ac3da0c2 RG |
122 | newEntry.d_ttd = tv; |
123 | d_readCallbacks.replace(it, newEntry); | |
0bff046b BH |
124 | } |
125 | ||
702b1925 RG |
126 | virtual void setWriteTTD(int fd, struct timeval tv, int timeout) |
127 | { | |
128 | const auto& it = d_writeCallbacks.find(fd); | |
129 | if (it == d_writeCallbacks.end()) { | |
130 | throw FDMultiplexerException("attempt to timestamp fd not in the multiplexer"); | |
131 | } | |
132 | ||
ac3da0c2 | 133 | auto newEntry = *it; |
702b1925 | 134 | tv.tv_sec += timeout; |
ac3da0c2 RG |
135 | newEntry.d_ttd = tv; |
136 | d_writeCallbacks.replace(it, newEntry); | |
a6ae6414 BH |
137 | } |
138 | ||
702b1925 | 139 | virtual std::vector<std::pair<int, funcparam_t> > getTimeouts(const struct timeval& tv, bool writes=false) |
0bff046b | 140 | { |
d8f6d49f | 141 | std::vector<std::pair<int, funcparam_t> > ret; |
ac3da0c2 RG |
142 | const auto tied = boost::tie(tv.tv_sec, tv.tv_usec); |
143 | auto& idx = writes ? d_writeCallbacks.get<TTDOrderedTag>() : d_readCallbacks.get<TTDOrderedTag>(); | |
27ae2e3c | 144 | |
ac3da0c2 RG |
145 | for (auto it = idx.begin(); it != idx.end(); ++it) { |
146 | if (it->d_ttd.tv_sec == 0 || tied <= boost::tie(it->d_ttd.tv_sec, it->d_ttd.tv_usec)) { | |
147 | break; | |
27ae2e3c | 148 | } |
ac3da0c2 | 149 | ret.push_back(std::make_pair(it->d_fd, it->d_parameter)); |
27ae2e3c RG |
150 | } |
151 | ||
0bff046b BH |
152 | return ret; |
153 | } | |
154 | ||
1f4abb20 BH |
155 | typedef FDMultiplexer* getMultiplexer_t(); |
156 | typedef std::multimap<int, getMultiplexer_t*> FDMultiplexermap_t; | |
157 | ||
158 | static FDMultiplexermap_t& getMultiplexerMap() | |
159 | { | |
160 | static FDMultiplexermap_t theMap; | |
161 | return theMap; | |
162 | } | |
163 | ||
5bdbb83d | 164 | virtual std::string getName() const = 0; |
1f4abb20 | 165 | |
696e32f5 RG |
166 | size_t getWatchedFDCount(bool writeFDs) const |
167 | { | |
168 | return writeFDs ? d_writeCallbacks.size() : d_readCallbacks.size(); | |
169 | } | |
170 | ||
ab3e8a6c | 171 | protected: |
ac3da0c2 RG |
172 | struct FDBasedTag {}; |
173 | struct TTDOrderedTag {}; | |
174 | struct ttd_compare | |
175 | { | |
176 | /* we want a 0 TTD (no timeout) to come _after_ everything else */ | |
177 | bool operator() (const struct timeval& lhs, const struct timeval& rhs) const | |
178 | { | |
179 | /* special treatment if at least one of the TTD is 0, | |
180 | normal comparison otherwise */ | |
181 | if (lhs.tv_sec == 0 && rhs.tv_sec == 0) { | |
182 | return false; | |
183 | } | |
184 | if (lhs.tv_sec == 0 && rhs.tv_sec != 0) { | |
185 | return false; | |
186 | } | |
187 | if (lhs.tv_sec != 0 && rhs.tv_sec == 0) { | |
188 | return true; | |
189 | } | |
190 | ||
191 | return std::tie(lhs.tv_sec, lhs.tv_usec) < std::tie(rhs.tv_sec, rhs.tv_usec); | |
192 | } | |
193 | }; | |
194 | ||
195 | typedef multi_index_container< | |
196 | Callback, | |
197 | indexed_by < | |
198 | hashed_unique<tag<FDBasedTag>, | |
199 | member<Callback,int,&Callback::d_fd> | |
200 | >, | |
201 | ordered_non_unique<tag<TTDOrderedTag>, | |
202 | member<Callback,struct timeval,&Callback::d_ttd>, | |
203 | ttd_compare | |
204 | > | |
205 | > | |
206 | > callbackmap_t; | |
207 | ||
ab3e8a6c | 208 | callbackmap_t d_readCallbacks, d_writeCallbacks; |
ab3e8a6c | 209 | |
27ae2e3c | 210 | virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter, const struct timeval* ttd=nullptr)=0; |
ab3e8a6c BH |
211 | virtual void removeFD(callbackmap_t& cbmap, int fd)=0; |
212 | bool d_inrun; | |
a1dfcec8 | 213 | callbackmap_t::iterator d_iter; |
c454d11b | 214 | |
27ae2e3c | 215 | void accountingAddFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter, const struct timeval* ttd=nullptr) |
c454d11b BH |
216 | { |
217 | Callback cb; | |
ac3da0c2 | 218 | cb.d_fd = fd; |
c454d11b BH |
219 | cb.d_callback=toDo; |
220 | cb.d_parameter=parameter; | |
221 | memset(&cb.d_ttd, 0, sizeof(cb.d_ttd)); | |
27ae2e3c RG |
222 | if (ttd) { |
223 | cb.d_ttd = *ttd; | |
224 | } | |
225 | ||
ac3da0c2 | 226 | auto pair = cbmap.insert(cb); |
27ae2e3c | 227 | if (!pair.second) { |
335da0ba | 228 | throw FDMultiplexerException("Tried to add fd "+std::to_string(fd)+ " to multiplexer twice"); |
27ae2e3c | 229 | } |
c454d11b BH |
230 | } |
231 | ||
232 | void accountingRemoveFD(callbackmap_t& cbmap, int fd) | |
233 | { | |
27ae2e3c | 234 | if(!cbmap.erase(fd)) { |
335da0ba | 235 | throw FDMultiplexerException("Tried to remove unlisted fd "+std::to_string(fd)+ " from multiplexer"); |
27ae2e3c | 236 | } |
c454d11b | 237 | } |
1f4abb20 | 238 | }; |