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36ad976b CH |
1 | /* |
2 | The software in this package is distributed under the GNU General | |
3 | Public License version 2 (with a special exception described below). | |
4 | ||
5 | A copy of GNU General Public License (GPL) is included in this distribution, | |
6 | in the file COPYING.GPL. | |
7 | ||
8 | As a special exception, if other files instantiate templates or use macros | |
9 | or inline functions from this file, or you compile this file and link it | |
10 | with other works to produce a work based on this file, this file | |
11 | does not by itself cause the resulting work to be covered | |
12 | by the GNU General Public License. | |
13 | ||
14 | However the source code for this file must still be made available | |
15 | in accordance with section (3) of the GNU General Public License. | |
16 | ||
17 | This exception does not invalidate any other reasons why a work based | |
18 | on this file might be covered by the GNU General Public License. | |
19 | ||
20 | Christian Herdtweck, Intra2net AG 2015 | |
21 | */ | |
22 | ||
23 | #ifndef RESOLVER_BASE_H | |
24 | #define RESOLVER_BASE_H | |
25 | ||
26 | #include <boost/shared_ptr.hpp> | |
4e7b6ff9 | 27 | #include <boost/function.hpp> |
36ad976b | 28 | |
4e7b6ff9 CH |
29 | #include <queue> |
30 | #include "host/pinger.h" | |
96779587 | 31 | #include "dns/hostaddress.h" |
c5b4902d | 32 | #include "dns/dnscache.h" |
96779587 | 33 | |
4e7b6ff9 CH |
34 | typedef boost::function<void(const bool, const int)> callback_type; |
35 | typedef std::queue<callback_type> callback_list_type; | |
96779587 | 36 | |
36ad976b CH |
37 | /** |
38 | * @brief: abstract base class for DnsResolver and IpPseudoResolver | |
39 | */ | |
40 | class ResolverBase | |
41 | { | |
42 | public: | |
4e7b6ff9 CH |
43 | virtual ~ResolverBase(); |
44 | ||
45 | /** | |
46 | * callbacks should be of type | |
47 | * void resolve_callback(const bool was_success, | |
48 | * const int cname_count) | |
49 | */ | |
50 | void async_resolve(const callback_type &callback); | |
36ad976b | 51 | |
c5b4902d | 52 | virtual HostAddress get_next_ip() = 0; |
923626c0 CH |
53 | virtual bool have_up_to_date_ip() = 0; |
54 | virtual int get_resolved_ip_count() = 0; | |
55 | ||
96779587 | 56 | protected: |
4e7b6ff9 CH |
57 | ResolverBase(const IoServiceItem &io_serv, |
58 | const std::string &hostname, | |
59 | const DnsCacheItem &cache ); | |
96779587 CH |
60 | |
61 | // variables | |
4e7b6ff9 CH |
62 | protected: |
63 | IoServiceItem IoService; | |
96779587 CH |
64 | std::string Hostname; |
65 | DnsCacheItem Cache; | |
4e7b6ff9 | 66 | callback_list_type CallbackList; |
96779587 CH |
67 | |
68 | // functions for subclasses | |
69 | protected: | |
4e7b6ff9 CH |
70 | virtual void do_resolve() = 0; |
71 | ||
72 | void update_cache( const HostAddressVec &new_results ) const; | |
ad83004d CH |
73 | void update_cache( const std::string &cname ) const; |
74 | void update_cache_ttl( const uint32_t ttl ) const; | |
4e7b6ff9 CH |
75 | |
76 | HostAddressVec& get_cached_results(const std::string host="") const; | |
77 | ||
78 | void schedule_callbacks(const bool was_success, | |
79 | const int cname_count); | |
80 | ||
96779587 | 81 | }; |
36ad976b | 82 | |
4e7b6ff9 CH |
83 | typedef boost::shared_ptr<ResolverBase> ResolverItem; |
84 | ||
36ad976b CH |
85 | #endif |
86 | ||
87 | // (created using vim -- the world's best text editor) | |
88 |