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// file : mod/mod-ci-github-gq.hxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef MOD_MOD_CI_GITHUB_GQ_HXX
#define MOD_MOD_CI_GITHUB_GQ_HXX
#include <libbrep/types.hxx>
#include <libbrep/utility.hxx>
#include <mod/mod-ci-github-gh.hxx>
#include <mod/mod-ci-github-service-data.hxx>
namespace brep
{
// GraphQL functions (all start with gq_).
//
// @@ TODO:
gq_create_check_run ();
gq_update_check_run ();
// @@ TODO Pass error, trace in same order everywhere.
// Fetch from GitHub the check run with the specified name (hints-shortened
// build ID).
//
// Return the check run or nullopt if no such check run exists.
//
// In case of error diagnostics will be issued and false returned in second.
//
// Note that the existence of more than one check run with the same name is
// considered an error and reported as such. The API docs imply that there
// can be more than one check run with the same name in a check suite, but
// the observed behavior is that creating a check run destroys the extant
// one, leaving only the new one with different node ID.
//
pair<optional<gh::check_run>, bool>
gq_fetch_check_run (const string& iat,
const string& check_suite_id,
const string& cr_name,
const basic_mark& error) noexcept
{
try
{
// Example request:
//
// query {
// node(id: "CS_kwDOLc8CoM8AAAAFQPQYEw") {
// ... on CheckSuite {
// checkRuns(last: 100, filterBy: {checkName: "linux_debian_..."}) {
// totalCount,
// edges {
// node {
// id, name, status
// }
// }
// }
// }
// }
// }
//
// This request does the following:
//
// - Look up the check suite by node ID ("direct node lookup"). This
// returns a Node (GraphQL interface).
//
// - Get to the concrete CheckSuite type by using a GraphQL "inline
// fragment" (`... on CheckSuite`).
//
// - Get the check suite's check runs
// - Filter by the sought name
// - Return only two check runs, just enough to be able to tell
// whether there are more than one check runs with this name (which
// is an error).
//
// - Return the id, name, and status fields from the matching check run
// objects.
//
string rq;
{
ostringstream os;
os << "query {" << '\n';
os << "node(id: " << gq_str (check_suite_id) << ") {" << '\n'
<< " ... on CheckSuite {" << '\n'
<< " checkRuns(last: 2," << '\n'
<< " filterBy: {" << '\n'
<< "checkName: " << gq_str (cr_name) << '\n'
<< " })" << '\n'
// Specify the selection set (fields to be returned). Note that
// edges and node are mandatory.
//
<< " {" << '\n'
<< " totalCount," << '\n'
<< " edges {" << '\n'
<< " node {" << '\n'
<< " id, name, status" << '\n'
<< " }" << '\n'
<< " }" << '\n'
<< " }" << '\n'
<< " }" << '\n'
<< "}" << '\n';
os << "}" << '\n';
rq = os.str ();
}
// Example response (the part we need to parse here, at least):
//
// {
// "node": {
// "checkRuns": {
// "totalCount": 1,
// "edges": [
// {
// "node": {
// "id": "CR_kwDOLc8CoM8AAAAFgeoweg",
// "name": "linux_debian_...",
// "status": "IN_PROGRESS"
// }
// }
// ]
// }
// }
// }
//
struct resp
{
optional<check_run> cr;
size_t cr_count = 0;
resp (json::parser& p)
{
using event = json::event;
parse_graphql_response (p, [this] (json::parser& p)
{
p.next_expect (event::begin_object);
p.next_expect_member_object ("node");
p.next_expect_member_object ("checkRuns");
cr_count = p.next_expect_member_number<size_t> ("totalCount");
p.next_expect_member_array ("edges");
for (size_t i (0); i != cr_count; ++i)
{
p.next_expect (event::begin_object);
p.next_expect_name ("node");
check_run cr (p);
p.next_expect (event::end_object);
if (i == 0)
this->cr = move (cr);
}
p.next_expect (event::end_array); // edges
p.next_expect (event::end_object); // checkRuns
p.next_expect (event::end_object); // node
p.next_expect (event::end_object);
});
}
resp () = default;
} rs;
uint16_t sc (github_post (rs,
"graphql",
strings {"Authorization: Bearer " + iat},
graphql_request (rq)));
if (sc == 200)
{
if (rs.cr_count <= 1)
return {rs.cr, true};
else
{
error << "unexpected number of check runs (" << rs.cr_count
<< ") in response";
}
}
else
error << "failed to get check run by name: error HTTP "
<< "response status " << sc;
}
catch (const json::invalid_json_input& e)
{
// Note: e.name is the GitHub API endpoint.
//
error << "malformed JSON in response from " << e.name
<< ", line: " << e.line << ", column: " << e.column
<< ", byte offset: " << e.position << ", error: " << e;
}
catch (const invalid_argument& e)
{
error << "malformed header(s) in response: " << e;
}
catch (const system_error& e)
{
error << "unable to get check run by name (errno=" << e.code ()
<< "): " << e.what ();
}
catch (const std::exception& e)
{
error << "unable to get check run by name: " << e.what ();
}
return {nullopt, false};
}
}
#endif // MOD_MOD_CI_GITHUB_GQ_HXX
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