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restconf_utils.cpp
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/*
* Copyright (C) 2023 CESNET, https://photonics.cesnet.cz/
*
* Written by Tomáš Pecka <[email protected]>
* Written by Jan Kundrát <[email protected]>
*
*/
#include "restconf_utils.h"
#include "sysrepo-cpp/Session.hpp"
using namespace std::string_literals;
namespace ng = nghttp2::asio_http2;
namespace ng_client = ng::client;
namespace {
std::string serverAddressAndPort(const std::string& server_address, const std::string& server_port) {
return "http://["s + server_address + "]" + ":" + server_port;
}
}
Response::Response(int statusCode, const Response::Headers& headers, const std::string& data)
: Response(statusCode, transformHeaders(headers), data)
{
}
Response::Response(int statusCode, const ng::header_map& headers, const std::string& data)
: statusCode(statusCode)
, headers(headers)
, data(data)
{
}
bool Response::equalStatusCodeAndHeaders(const Response& o) const
{
// Skipping 'date' header. Its value will not be reproducible in simple tests
ng::header_map myHeaders(headers);
ng::header_map otherHeaders(o.headers);
myHeaders.erase("date");
otherHeaders.erase("date");
return statusCode == o.statusCode && std::equal(myHeaders.begin(), myHeaders.end(), otherHeaders.begin(), otherHeaders.end(), [](const auto& a, const auto& b) {
return a.first == b.first && a.second.value == b.second.value; // Skipping 'sensitive' field from ng::header_value which does not seem important for us.
});
}
bool Response::operator==(const Response& o) const
{
return equalStatusCodeAndHeaders(o) && data == o.data;
}
ng::header_map Response::transformHeaders(const Response::Headers& headers)
{
ng::header_map res;
std::transform(headers.begin(), headers.end(), std::inserter(res, res.end()), [](const auto& h) -> std::pair<std::string, ng::header_value> { return {h.first, {h.second, false}}; });
return res;
}
Response clientRequest(const std::string& server_address,
const std::string& server_port,
const std::string& method,
const std::string& uri,
const std::string& data,
const std::map<std::string, std::string>& headers,
const boost::posix_time::time_duration timeout)
{
boost::asio::io_service io_service;
auto client = std::make_shared<ng_client::session>(io_service, server_address, server_port);
client->read_timeout(timeout);
std::ostringstream oss;
ng::header_map resHeaders;
int statusCode;
client->on_connect([&](auto) {
boost::system::error_code ec;
ng::header_map reqHeaders;
for (const auto& [name, value] : headers) {
reqHeaders.insert({name, {value, false}});
}
auto req = client->submit(ec, method, serverAddressAndPort(server_address, server_port) + uri, data, reqHeaders);
req->on_response([&](const ng_client::response& res) {
res.on_data([&oss](const uint8_t* data, std::size_t len) {
oss.write(reinterpret_cast<const char*>(data), len);
});
statusCode = res.status_code();
resHeaders = res.header();
});
req->on_close([maybeClient = std::weak_ptr<ng_client::session>{client}](auto) {
if (auto client = maybeClient.lock()) {
client->shutdown();
}
});
});
client->on_error([](const boost::system::error_code& ec) {
throw std::runtime_error{"HTTP client error: " + ec.message()};
});
io_service.run();
return {statusCode, resHeaders, oss.str()};
}
UniqueResource manageNacm(sysrepo::Session session)
{
return make_unique_resource(
[session]() mutable {
session.switchDatastore(sysrepo::Datastore::Running);
session.copyConfig(sysrepo::Datastore::Startup, "ietf-netconf-acm");
},
[session]() mutable {
session.switchDatastore(sysrepo::Datastore::Running);
/* cleanup running DS of ietf-netconf-acm module
because it contains XPaths to other modules that we
can't uninstall because the running DS content would be invalid
*/
session.copyConfig(sysrepo::Datastore::Startup, "ietf-netconf-acm");
});
}
void setupRealNacm(sysrepo::Session session)
{
session.switchDatastore(sysrepo::Datastore::Running);
session.setItem("/ietf-netconf-acm:nacm/enable-external-groups", "false");
session.setItem("/ietf-netconf-acm:nacm/groups/group[name='optics']/user-name[.='dwdm']", "");
session.setItem("/ietf-netconf-acm:nacm/groups/group[name='yangnobody']/user-name[.='yangnobody']", "");
session.setItem("/ietf-netconf-acm:nacm/groups/group[name='norules']/user-name[.='norules']", "");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/group[.='yangnobody']", "");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='10']/module-name", "ietf-system");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='10']/action", "permit");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='10']/access-operations", "read");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='10']/path", "/ietf-system:system/contact");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='11']/module-name", "ietf-system");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='11']/action", "permit");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='11']/access-operations", "read");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='11']/path", "/ietf-system:system/hostname");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='12']/module-name", "ietf-system");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='12']/action", "permit");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='12']/access-operations", "read");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='12']/path", "/ietf-system:system/location");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='13']/module-name", "example");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='13']/action", "permit");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='13']/access-operations", "read");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='14']/module-name", "ietf-restconf-monitoring");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='14']/action", "permit");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='14']/access-operations", "read");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='15']/module-name", "example-delete");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='15']/action", "permit");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='15']/access-operations", "read");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='15']/path", "/example-delete:immutable");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='16']/module-name", "ietf-subscribed-notifications");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='16']/action", "permit");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='16']/access-operations", "exec");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='16']/rpc-name", "establish-subscription");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='99']/module-name", "*");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='anon rule']/rule[name='99']/action", "deny");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='dwdm rule']/group[.='optics']", "");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='dwdm rule']/rule[name='1']/module-name", "ietf-system");
session.setItem("/ietf-netconf-acm:nacm/rule-list[name='dwdm rule']/rule[name='1']/action", "permit"); // overrides nacm:default-deny-* rules in ietf-system model
session.applyChanges();
}
SSEClient::SSEClient(
boost::asio::io_service& io,
const std::string& server_address,
const std::string& server_port,
std::binary_semaphore& requestSent,
const RestconfNotificationWatcher& notification,
const std::string& uri,
const std::map<std::string, std::string>& headers,
const boost::posix_time::seconds silenceTimeout)
: client(std::make_shared<ng_client::session>(io, server_address, server_port))
, t(io, silenceTimeout)
{
ng::header_map reqHeaders;
for (const auto& [name, value] : headers) {
reqHeaders.insert({name, {value, false}});
}
// shutdown the client after a period of no traffic
t.async_wait([maybeClient = std::weak_ptr<ng_client::session>{client}](const boost::system::error_code& ec) {
if (ec == boost::asio::error::operation_aborted) {
return;
}
if (auto client = maybeClient.lock()) {
client->shutdown();
}
});
client->on_connect([&, uri, reqHeaders, silenceTimeout, server_address, server_port](auto) {
boost::system::error_code ec;
auto req = client->submit(ec, "GET", serverAddressAndPort(server_address, server_port) + uri, "", reqHeaders);
req->on_response([&, silenceTimeout](const ng_client::response& res) {
requestSent.release();
res.on_data([&, silenceTimeout](const uint8_t* data, std::size_t len) {
// not a production-ready code. In real-life condition the data received in one callback might probably be incomplete
for (const auto& event : parseEvents(std::string(reinterpret_cast<const char*>(data), len))) {
notification(event);
}
t.expires_from_now(silenceTimeout);
});
});
});
client->on_error([&](const boost::system::error_code& ec) {
throw std::runtime_error{"HTTP client error: " + ec.message()};
});
}
std::vector<std::string> SSEClient::parseEvents(const std::string& msg)
{
static const std::string prefix = "data:";
std::vector<std::string> res;
std::istringstream iss(msg);
std::string line;
std::string event;
while (std::getline(iss, line)) {
if (line.compare(0, prefix.size(), prefix) == 0) {
event += line.substr(prefix.size());
} else if (line.empty()) {
res.emplace_back(std::move(event));
event.clear();
} else {
CAPTURE(msg);
FAIL("Unprefixed response");
}
}
return res;
}