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LibIPC+AudioServer: Allow unsolicited server-to-client IPC messages

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Client-side connection objects must now provide both client and server
endpoint types. When a message is received from the server side, we try
to decode it using both endpoint types and then send it to the right
place for handling.

This now makes it possible for AudioServer to send unsolicited messages
to its clients. This opens up a ton of possibilities :^)
This commit is contained in:
Andreas Kling 2019-11-23 16:43:21 +01:00
parent 06ee24263c
commit 630d5b3ffd
13 changed files with 95 additions and 42 deletions
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25
Libraries/LibCore/CoreIPCServer.h
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@ -256,7 +256,7 @@ namespace Server {
, m_client_id(client_id)
{
add_child(socket);
m_socket->on_ready_to_read = [this] { drain_client(); };
m_socket->on_ready_to_read = [this] { drain_messages_from_client(); };
}
virtual ~ConnectionNG() override
@ -287,15 +287,16 @@ namespace Server {
ASSERT(nwritten == buffer.size());
}
void drain_client()
void drain_messages_from_client()
{
unsigned messages_received = 0;
Vector<u8> bytes;
for (;;) {
u8 buffer[4096];
ssize_t nread = recv(m_socket->fd(), buffer, sizeof(buffer), MSG_DONTWAIT);
if (nread == 0 || (nread == -1 && errno == EAGAIN)) {
if (!messages_received) {
if (bytes.is_empty()) {
CEventLoop::current().post_event(*this, make<DisconnectedEvent>(client_id()));
return;
}
break;
}
@ -303,17 +304,21 @@ namespace Server {
perror("recv");
ASSERT_NOT_REACHED();
}
auto message = m_endpoint.decode_message(ByteBuffer::wrap(buffer, nread));
bytes.append(buffer, nread);
}
size_t decoded_bytes = 0;
for (size_t index = 0; index < (size_t)bytes.size(); index += decoded_bytes) {
auto remaining_bytes = ByteBuffer::wrap(bytes.data() + index, bytes.size() - index);
auto message = Endpoint::decode_message(remaining_bytes, decoded_bytes);
if (!message) {
dbg() << "drain_client: Endpoint didn't recognize message";
dbg() << "drain_messages_from_client: Endpoint didn't recognize message";
did_misbehave();
return;
}
++messages_received;
auto response = m_endpoint.handle(*message);
if (response)
if (auto response = m_endpoint.handle(*message))
post_message(*response);
ASSERT(decoded_bytes);
}
}