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/*
* Copyright 2007-2021 CM4all GmbH
* All rights reserved.
*
* author: Max Kellermann <mk@cm4all.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Client.hxx"
#include "ConnectionListener.hxx"
#include "ErrorHandler.hxx"
#include "Error.hxx"
#include <avahi-common/error.h>
#include <cassert>
namespace Avahi {
Client::Client(EventLoop &event_loop, ErrorHandler &_error_handler) noexcept
:error_handler(_error_handler),
reconnect_timer(event_loop, BIND_THIS_METHOD(OnReconnectTimer)),
poll(event_loop)
{
reconnect_timer.Schedule({});
}
Client::~Client() noexcept
{
Close();
}
void
Client::Close() noexcept
{
if (client != nullptr) {
for (auto *l : listeners)
l->OnAvahiDisconnect();
avahi_client_free(client);
client = nullptr;
}
reconnect_timer.Cancel();
}
void
Client::ClientCallback(AvahiClient *c, AvahiClientState state) noexcept
{
int error;
switch (state) {
case AVAHI_CLIENT_S_RUNNING:
for (auto *l : listeners)
l->OnAvahiConnect(c);
break;
case AVAHI_CLIENT_FAILURE:
error = avahi_client_errno(c);
if (error == AVAHI_ERR_DISCONNECTED) {
Close();
reconnect_timer.Schedule(std::chrono::seconds(10));
} else {
if (!error_handler.OnAvahiError(std::make_exception_ptr(MakeError(error,
"Avahi connection error"))))
return;
reconnect_timer.Schedule(std::chrono::minutes(1));
}
for (auto *l : listeners)
l->OnAvahiDisconnect();
break;
case AVAHI_CLIENT_S_COLLISION:
case AVAHI_CLIENT_S_REGISTERING:
for (auto *l : listeners)
l->OnAvahiChanged();
break;
case AVAHI_CLIENT_CONNECTING:
break;
}
}
void
Client::ClientCallback(AvahiClient *c, AvahiClientState state,
void *userdata) noexcept
{
auto &client = *(Client *)userdata;
client.ClientCallback(c, state);
}
void
Client::OnReconnectTimer() noexcept
{
int error;
client = avahi_client_new(&poll, AVAHI_CLIENT_NO_FAIL,
ClientCallback, this,
&error);
if (client == nullptr) {
if (!error_handler.OnAvahiError(std::make_exception_ptr(MakeError(error,
"Failed to create Avahi client"))))
return;
reconnect_timer.Schedule(std::chrono::minutes(1));
return;
}
}
} // namespace Avahi