3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #ifndef HTTPFETCH_HEADER
21 #define HTTPFETCH_HEADER
27 // Can be used in place of "caller" in asynchronous transfers to discard result
28 // (used as default value of "caller")
29 #define HTTPFETCH_DISCARD 0
30 #define HTTPFETCH_SYNC 1
32 struct HTTPFetchRequest
36 // Identifies the caller (for asynchronous requests)
37 // Ignored by httpfetch_sync
40 // Some number that identifies the request
41 // (when the same caller issues multiple httpfetch_async calls)
42 unsigned long request_id;
44 // Timeout for the whole transfer, in milliseconds
47 // Timeout for the connection phase, in milliseconds
50 // POST data (should be application/x-www-form-urlencoded
51 // unless a Content-Type header is specified in extra_headers)
52 // If this is empty a GET request is done instead.
53 std::string post_fields;
55 // If not empty, should contain entries such as "Accept: text/html"
56 std::vector<std::string> extra_headers;
59 std::string useragent;
64 struct HTTPFetchResult
70 // The caller and request_id from the corresponding HTTPFetchRequest.
72 unsigned long request_id;
80 caller = HTTPFETCH_DISCARD;
84 HTTPFetchResult(const HTTPFetchRequest &fetchrequest)
90 caller = fetchrequest.caller;
91 request_id = fetchrequest.request_id;
96 // Initializes the httpfetch module
97 void httpfetch_init(int parallel_limit);
99 // Stops the httpfetch thread and cleans up resources
100 void httpfetch_cleanup();
102 // Starts an asynchronous HTTP fetch request
103 void httpfetch_async(const HTTPFetchRequest &fetchrequest);
105 // If any fetch for the given caller ID is complete, removes it from the
106 // result queue, sets fetchresult and returns true. Otherwise returns false.
107 bool httpfetch_async_get(unsigned long caller, HTTPFetchResult &fetchresult);
109 // Allocates a caller ID for httpfetch_async
110 // Not required if you want to set caller = HTTPFETCH_DISCARD
111 unsigned long httpfetch_caller_alloc();
113 // Frees a caller ID allocated with httpfetch_caller_alloc
114 // Note: This can be expensive, because the httpfetch thread is told
115 // to stop any ongoing fetches for the given caller.
116 void httpfetch_caller_free(unsigned long caller);
118 // Performs a synchronous HTTP request. This blocks and therefore should
119 // only be used from background threads.
120 void httpfetch_sync(const HTTPFetchRequest &fetchrequest,
121 HTTPFetchResult &fetchresult);
124 #endif // !HTTPFETCH_HEADER