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1 | /*************************************************************************** |
2 | * Copyright (C) 2008 by Gerd v. Egidy * | |
3 | * gve@intra2net.com * | |
4 | * * | |
5 | * This library is free software; you can redistribute it and/or modify * | |
6 | * it under the terms of the GNU Lesser General Public License version * | |
7 | * 2.1 as published by the Free Software Foundation. * | |
8 | * * | |
9 | * This library is distributed in the hope that it will be useful, * | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
12 | * GNU Lesser General Public License for more details. * | |
13 | * * | |
14 | * You should have received a copy of the GNU Lesser General Public * | |
15 | * License along with this program; if not, write to the * | |
16 | * Free Software Foundation, Inc., * | |
17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * | |
18 | ***************************************************************************/ | |
19 | ||
20 | #include <functional> | |
21 | #include <string> | |
22 | ||
23 | #include <socket_wrapper.hxx> | |
24 | ||
25 | namespace libt2n | |
26 | { | |
27 | ||
487afb79 | 28 | /// return active connection, create new tcp or unix connection if not existing |
ffbbf9ab GE |
29 | client_connection* BasicSocketWrapper::get_connection(void) |
30 | { | |
31 | if (c.get() == NULL) | |
32 | { | |
33 | if (socket_type == tcp_s) | |
34 | c=std::auto_ptr<socket_client_connection> | |
e1614a6d | 35 | (new socket_client_connection(port,server,connect_timeout_usec,max_retries,logstream,log_level)); |
ffbbf9ab GE |
36 | else if (socket_type == unix_s) |
37 | c=std::auto_ptr<socket_client_connection> | |
e1614a6d | 38 | (new socket_client_connection(path,connect_timeout_usec,max_retries,logstream,log_level)); |
ffbbf9ab GE |
39 | } |
40 | ||
41 | return c.get(); | |
42 | } | |
43 | ||
487afb79 GE |
44 | /// try to reconnect max_retries time if we encounter a t2n_communication_error |
45 | /// during execution of the command | |
fb3345ad | 46 | bool ReconnectSocketWrapper::handle(command_client* stubBase, boost::function< void() > f) |
ffbbf9ab GE |
47 | { |
48 | int tries=0; | |
49 | ||
50 | while(true) | |
51 | { | |
52 | try | |
53 | { | |
54 | // we always reconnect if something went wrong before: | |
55 | // makes sure the buffers are clean of half-sent packets etc. | |
56 | if (tries > 0) | |
57 | c->reconnect(); | |
58 | ||
59 | f(); | |
60 | // we were successful | |
fb3345ad | 61 | return true; |
ffbbf9ab GE |
62 | } |
63 | catch(t2n_connect_error &e) | |
64 | { | |
65 | // reconnect already tries max_tries times to reconnect: we are done if that failed | |
66 | throw(e); | |
67 | } | |
68 | catch(t2n_communication_error &e) | |
69 | { | |
70 | // aborts the loop with an exception after max_retries iterations | |
71 | // retries means that the first try doesn't count: use > | |
72 | if (tries > max_retries) | |
73 | throw(e); | |
74 | ||
75 | // otherwise ignore the exception and reconnect in the next iteration | |
76 | } | |
77 | catch(...) | |
78 | { | |
79 | throw; | |
80 | } | |
81 | ||
82 | tries++; | |
83 | } | |
fb3345ad GE |
84 | |
85 | return false; | |
ffbbf9ab GE |
86 | } |
87 | ||
487afb79 | 88 | /// return active connection, return a dummy-connection if we can't establish one |
ffbbf9ab GE |
89 | client_connection* ReconnectIgnoreFailureSocketWrapper::get_connection(void) |
90 | { | |
fb3345ad | 91 | client_connection* tmp=BasicSocketWrapper::get_connection(); |
ffbbf9ab | 92 | |
fb3345ad | 93 | if (tmp->is_closed()) |
ffbbf9ab | 94 | { |
fb3345ad GE |
95 | // throw away the closed connection... |
96 | c.reset(); | |
97 | // ...return the dummy one instead | |
98 | tmp=&dc; | |
ffbbf9ab GE |
99 | } |
100 | ||
101 | return tmp; | |
102 | } | |
103 | ||
487afb79 | 104 | /// try to execute the command, may |
fb3345ad | 105 | bool ReconnectIgnoreFailureSocketWrapper::handle(command_client* stubBase, boost::function< void() > f) |
ffbbf9ab | 106 | { |
fb3345ad | 107 | if (!connection_established()) |
ffbbf9ab | 108 | { |
fb3345ad GE |
109 | // dummy connection is in place: try to establish a real one |
110 | client_connection* tmp=get_connection(); | |
111 | ||
112 | if (tmp != &dc) | |
113 | { | |
114 | // success! we've got a real connection | |
115 | stubBase->replace_connection(tmp); | |
116 | } | |
ffbbf9ab | 117 | } |
fb3345ad GE |
118 | |
119 | // only try to handle the call if we've got a real connection | |
120 | if (connection_established()) | |
ffbbf9ab | 121 | { |
fb3345ad GE |
122 | try |
123 | { | |
124 | ReconnectSocketWrapper::handle(stubBase,f); | |
125 | return true; | |
126 | } | |
127 | catch(t2n_communication_error &e) | |
128 | { | |
129 | // ignore | |
130 | } | |
131 | catch(...) | |
132 | { | |
133 | throw; | |
134 | } | |
ffbbf9ab | 135 | } |
fb3345ad GE |
136 | |
137 | return false; | |
ffbbf9ab GE |
138 | } |
139 | ||
140 | } |