CMake/Source/cmServerConnection.cxx

378 lines
9.4 KiB
C++

/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmServerConnection.h"
#include "cmServerDictionary.h"
#include "cmFileMonitor.h"
#include "cmServer.h"
#include <assert.h>
namespace {
struct write_req_t
{
uv_write_t req;
uv_buf_t buf;
};
void on_alloc_buffer(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf)
{
(void)(handle);
char* rawBuffer = new char[suggested_size];
*buf = uv_buf_init(rawBuffer, static_cast<unsigned int>(suggested_size));
}
void on_read(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf)
{
auto conn = reinterpret_cast<cmServerConnection*>(stream->data);
if (nread >= 0) {
conn->ReadData(std::string(buf->base, buf->base + nread));
} else {
conn->TriggerShutdown();
}
delete[](buf->base);
}
void on_write(uv_write_t* req, int status)
{
(void)(status);
auto conn = reinterpret_cast<cmServerConnection*>(req->data);
// Free req and buffer
write_req_t* wr = reinterpret_cast<write_req_t*>(req);
delete[](wr->buf.base);
delete wr;
conn->ProcessNextRequest();
}
void on_new_connection(uv_stream_t* stream, int status)
{
(void)(status);
auto conn = reinterpret_cast<cmServerConnection*>(stream->data);
conn->Connect(stream);
}
void on_signal(uv_signal_t* signal, int signum)
{
auto conn = reinterpret_cast<cmServerConnection*>(signal->data);
(void)(signum);
conn->TriggerShutdown();
}
void on_signal_close(uv_handle_t* handle)
{
delete reinterpret_cast<uv_signal_t*>(handle);
}
void on_pipe_close(uv_handle_t* handle)
{
delete reinterpret_cast<uv_pipe_t*>(handle);
}
void on_tty_close(uv_handle_t* handle)
{
delete reinterpret_cast<uv_tty_t*>(handle);
}
} // namespace
class LoopGuard
{
public:
LoopGuard(cmServerConnection* connection)
: Connection(connection)
{
this->Connection->mLoop = uv_default_loop();
if (!this->Connection->mLoop) {
return;
}
this->Connection->mFileMonitor =
new cmFileMonitor(this->Connection->mLoop);
}
~LoopGuard()
{
if (!this->Connection->mLoop) {
return;
}
if (this->Connection->mFileMonitor) {
delete this->Connection->mFileMonitor;
}
uv_loop_close(this->Connection->mLoop);
this->Connection->mLoop = nullptr;
}
private:
cmServerConnection* Connection;
};
cmServerConnection::cmServerConnection()
{
}
cmServerConnection::~cmServerConnection()
{
}
void cmServerConnection::SetServer(cmServer* s)
{
this->Server = s;
}
bool cmServerConnection::ProcessEvents(std::string* errorMessage)
{
assert(this->Server);
errorMessage->clear();
this->RawReadBuffer.clear();
this->RequestBuffer.clear();
LoopGuard guard(this);
(void)(guard);
if (!this->mLoop) {
*errorMessage = "Internal Error: Failed to create event loop.";
return false;
}
this->SIGINTHandler = new uv_signal_t;
uv_signal_init(this->mLoop, this->SIGINTHandler);
this->SIGINTHandler->data = static_cast<void*>(this);
uv_signal_start(this->SIGINTHandler, &on_signal, SIGINT);
this->SIGHUPHandler = new uv_signal_t;
uv_signal_init(this->mLoop, this->SIGHUPHandler);
this->SIGHUPHandler->data = static_cast<void*>(this);
uv_signal_start(this->SIGHUPHandler, &on_signal, SIGHUP);
if (!DoSetup(errorMessage)) {
return false;
}
if (uv_run(this->mLoop, UV_RUN_DEFAULT) != 0) {
*errorMessage = "Internal Error: Event loop stopped in unclean state.";
return false;
}
// These need to be cleaned up by now:
assert(!this->ReadStream);
assert(!this->WriteStream);
this->RawReadBuffer.clear();
this->RequestBuffer.clear();
return true;
}
void cmServerConnection::ReadData(const std::string& data)
{
this->RawReadBuffer += data;
for (;;) {
auto needle = this->RawReadBuffer.find('\n');
if (needle == std::string::npos) {
return;
}
std::string line = this->RawReadBuffer.substr(0, needle);
const auto ls = line.size();
if (ls > 1 && line.at(ls - 1) == '\r') {
line.erase(ls - 1, 1);
}
this->RawReadBuffer.erase(this->RawReadBuffer.begin(),
this->RawReadBuffer.begin() +
static_cast<long>(needle) + 1);
if (line == kSTART_MAGIC) {
this->RequestBuffer.clear();
continue;
}
if (line == kEND_MAGIC) {
this->Server->QueueRequest(this->RequestBuffer);
this->RequestBuffer.clear();
} else {
this->RequestBuffer += line;
this->RequestBuffer += "\n";
}
}
}
void cmServerConnection::TriggerShutdown()
{
this->FileMonitor()->StopMonitoring();
uv_signal_stop(this->SIGINTHandler);
uv_signal_stop(this->SIGHUPHandler);
uv_close(reinterpret_cast<uv_handle_t*>(this->SIGINTHandler),
&on_signal_close); // delete handle
uv_close(reinterpret_cast<uv_handle_t*>(this->SIGHUPHandler),
&on_signal_close); // delete handle
this->SIGINTHandler = nullptr;
this->SIGHUPHandler = nullptr;
this->TearDown();
}
void cmServerConnection::WriteData(const std::string& data)
{
assert(this->WriteStream);
auto ds = data.size();
write_req_t* req = new write_req_t;
req->req.data = this;
req->buf = uv_buf_init(new char[ds], static_cast<unsigned int>(ds));
memcpy(req->buf.base, data.c_str(), ds);
uv_write(reinterpret_cast<uv_write_t*>(req),
static_cast<uv_stream_t*>(this->WriteStream), &req->buf, 1,
on_write);
}
void cmServerConnection::ProcessNextRequest()
{
Server->PopOne();
}
void cmServerConnection::SendGreetings()
{
Server->PrintHello();
}
cmServerStdIoConnection::cmServerStdIoConnection()
{
this->Input.tty = nullptr;
this->Output.tty = nullptr;
}
bool cmServerStdIoConnection::DoSetup(std::string* errorMessage)
{
(void)(errorMessage);
if (uv_guess_handle(1) == UV_TTY) {
usesTty = true;
this->Input.tty = new uv_tty_t;
uv_tty_init(this->Loop(), this->Input.tty, 0, 1);
uv_tty_set_mode(this->Input.tty, UV_TTY_MODE_NORMAL);
Input.tty->data = this;
this->ReadStream = reinterpret_cast<uv_stream_t*>(this->Input.tty);
this->Output.tty = new uv_tty_t;
uv_tty_init(this->Loop(), this->Output.tty, 1, 0);
uv_tty_set_mode(this->Output.tty, UV_TTY_MODE_NORMAL);
Output.tty->data = this;
this->WriteStream = reinterpret_cast<uv_stream_t*>(this->Output.tty);
} else {
usesTty = false;
this->Input.pipe = new uv_pipe_t;
uv_pipe_init(this->Loop(), this->Input.pipe, 0);
uv_pipe_open(this->Input.pipe, 0);
Input.pipe->data = this;
this->ReadStream = reinterpret_cast<uv_stream_t*>(this->Input.pipe);
this->Output.pipe = new uv_pipe_t;
uv_pipe_init(this->Loop(), this->Output.pipe, 0);
uv_pipe_open(this->Output.pipe, 1);
Output.pipe->data = this;
this->WriteStream = reinterpret_cast<uv_stream_t*>(this->Output.pipe);
}
SendGreetings();
uv_read_start(this->ReadStream, on_alloc_buffer, on_read);
return true;
}
void cmServerStdIoConnection::TearDown()
{
if (usesTty) {
uv_close(reinterpret_cast<uv_handle_t*>(this->Input.tty), &on_tty_close);
uv_close(reinterpret_cast<uv_handle_t*>(this->Output.tty), &on_tty_close);
this->Input.tty = nullptr;
this->Output.tty = nullptr;
} else {
uv_close(reinterpret_cast<uv_handle_t*>(this->Input.pipe), &on_pipe_close);
uv_close(reinterpret_cast<uv_handle_t*>(this->Output.pipe),
&on_pipe_close);
this->Input.pipe = nullptr;
this->Input.pipe = nullptr;
}
this->ReadStream = nullptr;
this->WriteStream = nullptr;
}
cmServerPipeConnection::cmServerPipeConnection(const std::string& name)
: PipeName(name)
{
}
bool cmServerPipeConnection::DoSetup(std::string* errorMessage)
{
this->ServerPipe = new uv_pipe_t;
uv_pipe_init(this->Loop(), this->ServerPipe, 0);
this->ServerPipe->data = this;
int r;
if ((r = uv_pipe_bind(this->ServerPipe, this->PipeName.c_str())) != 0) {
*errorMessage = std::string("Internal Error with ") + this->PipeName +
": " + uv_err_name(r);
return false;
}
auto serverStream = reinterpret_cast<uv_stream_t*>(this->ServerPipe);
if ((r = uv_listen(serverStream, 1, on_new_connection)) != 0) {
*errorMessage = std::string("Internal Error listening on ") +
this->PipeName + ": " + uv_err_name(r);
return false;
}
return true;
}
void cmServerPipeConnection::TearDown()
{
if (this->ClientPipe) {
uv_close(reinterpret_cast<uv_handle_t*>(this->ClientPipe), &on_pipe_close);
this->WriteStream->data = nullptr;
}
uv_close(reinterpret_cast<uv_handle_t*>(this->ServerPipe), &on_pipe_close);
this->ClientPipe = nullptr;
this->ServerPipe = nullptr;
this->WriteStream = nullptr;
this->ReadStream = nullptr;
}
void cmServerPipeConnection::Connect(uv_stream_t* server)
{
if (this->ClientPipe) {
// Accept and close all pipes but the first:
uv_pipe_t* rejectPipe = new uv_pipe_t;
uv_pipe_init(this->Loop(), rejectPipe, 0);
auto rejecter = reinterpret_cast<uv_stream_t*>(rejectPipe);
uv_accept(server, rejecter);
uv_close(reinterpret_cast<uv_handle_t*>(rejecter), &on_pipe_close);
return;
}
this->ClientPipe = new uv_pipe_t;
uv_pipe_init(this->Loop(), this->ClientPipe, 0);
this->ClientPipe->data = this;
auto client = reinterpret_cast<uv_stream_t*>(this->ClientPipe);
if (uv_accept(server, client) != 0) {
uv_close(reinterpret_cast<uv_handle_t*>(client), nullptr);
return;
}
this->ReadStream = client;
this->WriteStream = client;
uv_read_start(this->ReadStream, on_alloc_buffer, on_read);
this->SendGreetings();
}