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// file : mod/mod-ci-github-post.hxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef MOD_MOD_CI_GITHUB_POST_HXX
#define MOD_MOD_CI_GITHUB_POST_HXX
#include <libbrep/types.hxx>
#include <libbrep/utility.hxx>
namespace brep
{
// Send a POST request to the GitHub API endpoint `ep`, parse GitHub's JSON
// response into `rs` (only for 200 codes), and return the HTTP status code.
//
// The endpoint `ep` should not have a leading slash.
//
// Pass additional HTTP headers in `hdrs`. For example:
//
// "HeaderName: header value"
//
// Throw invalid_argument if unable to parse the response headers,
// invalid_json_input (derived from invalid_argument) if unable to parse the
// response body, and system_error in other cases.
//
template <typename T>
uint16_t
github_post (T& rs,
const string& ep,
const strings& hdrs,
const string& body = "")
{
// Convert the header values to curl header option/value pairs.
//
strings hdr_opts;
for (const string& h: hdrs)
{
hdr_opts.push_back ("--header");
hdr_opts.push_back (h);
}
// Run curl.
//
try
{
// Pass --include to print the HTTP status line (followed by the response
// headers) so that we can get the response status code.
//
// Suppress the --fail option which causes curl to exit with status 22
// in case of an error HTTP response status code (>= 400) otherwise we
// can't get the status code.
//
// Note that butl::curl also adds --location to make curl follow redirects
// (which is recommended by GitHub).
//
// The API version `2022-11-28` is the only one currently supported. If
// the X-GitHub-Api-Version header is not passed this version will be
// chosen by default.
//
fdpipe errp (fdopen_pipe ()); // stderr pipe.
curl c (path ("-"), // Read input from curl::out.
path ("-"), // Write response to curl::in.
process::pipe (errp.in.get (), move (errp.out)),
curl::post,
curl::flags::no_fail,
"https://api.github.com/" + ep,
"--no-fail", // Don't fail if response status code >= 400.
"--include", // Output response headers for status code.
"--header", "Accept: application/vnd.github+json",
"--header", "X-GitHub-Api-Version: 2022-11-28",
move (hdr_opts));
ifdstream err (move (errp.in));
// Parse the HTTP response.
//
uint16_t sc; // Status code.
try
{
// Note: re-open in/out so that they get automatically closed on
// exception.
//
ifdstream in (c.in.release (), fdstream_mode::skip);
ofdstream out (c.out.release ());
// Write request body to out.
//
if (!body.empty ())
out << body;
out.close ();
sc = curl::read_http_status (in).code; // May throw invalid_argument.
// Parse the response body if the status code is in the 200 range.
//
if (sc >= 200 && sc < 300)
{
// Use endpoint name as input name (useful to have it propagated
// in exceptions).
//
json::parser p (in, ep /* name */);
rs = T (p);
}
in.close ();
}
catch (const io_error& e)
{
// If the process exits with non-zero status, assume the IO error is due
// to that and fall through.
//
if (c.wait ())
{
throw_generic_error (
e.code ().value (),
(string ("unable to read curl stdout: ") + e.what ()).c_str ());
}
}
catch (const json::invalid_json_input&)
{
// If the process exits with non-zero status, assume the JSON error is
// due to that and fall through.
//
if (c.wait ())
throw;
}
if (!c.wait ())
{
string et (err.read_text ());
throw_generic_error (EINVAL,
("non-zero curl exit status: " + et).c_str ());
}
err.close ();
return sc;
}
catch (const process_error& e)
{
throw_generic_error (
e.code ().value (),
(string ("unable to execute curl:") + e.what ()).c_str ());
}
catch (const io_error& e)
{
// Unable to read diagnostics from stderr.
//
throw_generic_error (
e.code ().value (),
(string ("unable to read curl stderr : ") + e.what ()).c_str ());
}
}
}
#endif // MOD_MOD_CI_GITHUB_POST_HXX
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