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// file : libbutl/curl.mxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef __cpp_modules_ts
#pragma once
#endif
// C includes.
#ifndef __cpp_lib_modules_ts
#include <string>
#include <type_traits>
#include <cstddef> // size_t
#include <utility> // forward()
#include <exception> // invalid_argument
#endif
// Other includes.
#ifdef __cpp_modules_ts
export module butl.curl;
#ifdef __cpp_lib_modules_ts
import std.core;
#endif
import butl.path;
import butl.process; //@@ MOD TODO: should we re-export?
import butl.fdstream;
import butl.small_vector;
#else
#include <libbutl/path.mxx>
#include <libbutl/process.mxx>
#include <libbutl/fdstream.mxx>
#include <libbutl/small-vector.mxx>
#endif
#include <libbutl/export.hxx>
LIBBUTL_MODEXPORT 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_SYMEXPORT 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_callback() 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;
};
pipe
map_in (nullfd_t, method_proto, io_data&);
pipe
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&);
pipe
map_out (nullfd_t, method_proto, io_data&);
pipe
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 <libbutl/curl.ixx>
#include <libbutl/curl.txx>
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