1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
// file : butl/curl -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUTL_CURL
#define BUTL_CURL
#include <string>
#include <type_traits>
#include <butl/export>
#include <butl/process>
#include <butl/fdstream>
#include <butl/small-vector>
namespace butl
{
// Perform a method (GET, POST, PUT) on a URL using the curl(1) program.
// Throw process_error and io_error (both derive from system_error) in case
// of errors.
//
// The I (in) and O (out) can be of the following types/values:
//
// nullfd Signal that no input/output is expected.
//
// path Read input/write output from/to a file. If the special "-"
// value is used, then instead input is connected to the curl::out
// ofdstream member and output -- to the curl::in ifdstream member.
// Note that the argument type should be path, not string (i.e.,
// pass path("-")).
//
// other Forwarded as is to process_start(). Normally either int or
// auto_fd.
//
// For example:
//
// curl (nullfd, // No input expected for GET.
// path ("-"), // Write response to curl::in.
// 2,
// curl::get,
// "http://example.org");
//
// curl (path ("-"), // Read request from curl::out.
// path::temp_path (), // Write result to a file.
// 2,
// curl::post,
// "http://example.org");
//
// curl (nullfd,
// fdnull (), // Write result to /dev/null.
// 2,
// curl::get,
// "tftp://localhost/foo");
//
// Typical usage:
//
// try
// {
// curl c (nullfd, // No input expected.
// path ("-"), // Output to curl::in.
// 2, // Diagnostics to stderr.
// curl::get, // GET method.
// "https://example.org",
// "-A", "foobot/1.2.3"); // Additional curl(1) options.
//
// for (string s; getline (c.in, s); )
// cout << s << endl;
//
// c.in.close ();
//
// if (!c.wait ())
// ... // curl returned non-zero status.
// }
// catch (const std::system_error& e)
// {
// cerr << "curl error: " << e << endl;
// }
//
// Notes:
//
// 1. If opened, in/out streams are in the binary mode.
//
// 2. If opened, in/out must be explicitly closed before calling wait().
//
// 3. Only binary data HTTP POST is currently supported (the --data-binary
// curl option).
//
class LIBBUTL_EXPORT curl: public process
{
public:
enum method_type {get, put, post};
ifdstream in;
ofdstream out;
template <typename I,
typename O,
typename E,
typename... A>
curl (I&& in,
O&& out,
E&& err,
method_type,
const std::string& url,
A&&... options);
// Version with the command line callback (see process_run() for details).
//
template <typename C,
typename I,
typename O,
typename E,
typename... A>
curl (const C&,
I&& in,
O&& out,
E&& err,
method_type,
const std::string& url,
A&&... options);
private:
enum method_proto {ftp_get, ftp_put, http_get, http_post};
using method_proto_options = small_vector<const char*, 2>;
method_proto
translate (method_type, const std::string& url, method_proto_options&);
private:
template <typename T>
struct is_other
{
using type = typename std::remove_reference<
typename std::remove_cv<T>::type>::type;
static const bool value = !(std::is_same<type, nullfd_t>::value ||
std::is_same<type, path>::value);
};
struct io_data
{
fdpipe pipe;
method_proto_options options;
std::string storage;
};
int
map_in (nullfd_t, method_proto, io_data&);
int
map_in (const path&, method_proto, io_data&);
template <typename I>
typename std::enable_if<is_other<I>::value, I>::type
map_in (I&&, method_proto, io_data&);
int
map_out (nullfd_t, method_proto, io_data&);
int
map_out (const path&, method_proto, io_data&);
template <typename O>
typename std::enable_if<is_other<O>::value, O>::type
map_out (O&&, method_proto, io_data&);
};
}
#include <butl/curl.ixx>
#include <butl/curl.txx>
#endif // BUTL_CURL
|
