CMake/Source/cmServerConnection.cxx

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Simplify CMake per-source license notices Per-source copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong. Precise contributor information is already maintained automatically by the version control tool. Ultimately it is the receiver of a file who is responsible for determining its licensing status, and per-source notices are merely a convenience. Therefore it is simpler and more accurate for each source to have a generic notice of the license name and references to more detailed information on copyright holders and full license terms. Our `Copyright.txt` file now contains a list of Contributors whose names appeared source-level copyright notices. It also references version control history for more precise information. Therefore we no longer need to spell out the list of Contributors in each source file notice. Replace CMake per-source copyright/license notice headers with a short description of the license and links to `Copyright.txt` and online information available from "https://cmake.org/licensing". The online URL also handles cases of modules being copied out of our source into other projects, so we can drop our notices about replacing links with full license text. Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority of the replacements mechanically. Manually fix up shebang lines and trailing newlines in a few files. Manually update the notices in a few files that the script does not handle.
2016-09-27 22:01:08 +03:00
/* 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->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();
if (Connection->mLoop) {
Connection->mFileMonitor = new cmFileMonitor(Connection->mLoop);
}
}
~LoopGuard()
{
if (Connection->mFileMonitor) {
delete Connection->mFileMonitor;
}
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->FileMonitor()->StopMonitoring();
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();
}