CMake/Source/cmServerConnection.cxx

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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2015 Stephen Kelly <steveire@gmail.com>
Copyright 2016 Tobias Hunger <tobias.hunger@qt.io>
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmServerConnection.h"
#include <cmServer.h>
#include <assert.h>
namespace {
static const std::string kSTART_MAGIC = "[== CMake Server ==[";
static const std::string kEND_MAGIC = "]== CMake Server ==]";
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->HandleEof();
}
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);
}
} // namespace
class LoopGuard
{
public:
LoopGuard(cmServerConnection* connection)
: Connection(connection)
{
Connection->mLoop = uv_default_loop();
}
~LoopGuard()
{
uv_loop_close(Connection->mLoop);
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;
}
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::HandleEof()
{
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();
}
bool cmServerStdIoConnection::DoSetup(std::string* errorMessage)
{
(void)(errorMessage);
if (uv_guess_handle(1) == UV_TTY) {
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);
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 {
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);
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()
{
uv_close(reinterpret_cast<uv_handle_t*>(this->ReadStream), nullptr);
this->ReadStream = nullptr;
uv_close(reinterpret_cast<uv_handle_t*>(this->WriteStream), nullptr);
this->WriteStream = nullptr;
}
cmServerPipeConnection::cmServerPipeConnection(const std::string& name)
: PipeName(name)
{
this->ServerPipe.data = nullptr;
this->ClientPipe.data = nullptr;
}
bool cmServerPipeConnection::DoSetup(std::string* errorMessage)
{
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);
serverStream->data = this;
if ((r = uv_listen(serverStream, 1, on_new_connection)) != 0) {
*errorMessage = std::string("Internal Error with ") + this->PipeName +
": " + uv_err_name(r);
return false;
}
return true;
}
void cmServerPipeConnection::TearDown()
{
if (this->WriteStream->data) {
uv_close(reinterpret_cast<uv_handle_t*>(this->WriteStream), nullptr);
this->WriteStream->data = nullptr;
}
uv_close(reinterpret_cast<uv_handle_t*>(&this->ServerPipe), nullptr);
this->WriteStream = nullptr;
this->ReadStream = nullptr;
}
void cmServerPipeConnection::Connect(uv_stream_t* server)
{
if (this->ClientPipe.data == this) {
// Accept and close all pipes but the first:
uv_pipe_t rejectPipe;
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), nullptr);
return;
}
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();
}