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//===-- Communication.cpp -------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/Communication.h"
#include "lldb/Utility/Connection.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Status.h"
#include "llvm/Support/Compiler.h"
#include <algorithm>
#include <cstring>
#include <memory>
#include <cerrno>
#include <cinttypes>
#include <cstdio>
using namespace lldb;
using namespace lldb_private;
Communication::Communication()
: m_connection_sp(), m_write_mutex(), m_close_on_eof(true) {
}
Communication::~Communication() {
Clear();
}
void Communication::Clear() {
Disconnect(nullptr);
}
ConnectionStatus Communication::Connect(const char *url, Status *error_ptr) {
Clear();
LLDB_LOG(GetLog(LLDBLog::Communication),
"{0} Communication::Connect (url = {1})", this, url);
lldb::ConnectionSP connection_sp(m_connection_sp);
if (connection_sp)
return connection_sp->Connect(url, error_ptr);
if (error_ptr)
*error_ptr = Status::FromErrorString("Invalid connection.");
return eConnectionStatusNoConnection;
}
ConnectionStatus Communication::Disconnect(Status *error_ptr) {
LLDB_LOG(GetLog(LLDBLog::Communication), "{0} Communication::Disconnect ()",
this);
lldb::ConnectionSP connection_sp(m_connection_sp);
if (connection_sp) {
ConnectionStatus status = connection_sp->Disconnect(error_ptr);
// We currently don't protect connection_sp with any mutex for multi-
// threaded environments. So lets not nuke our connection class without
// putting some multi-threaded protections in. We also probably don't want
// to pay for the overhead it might cause if every time we access the
// connection we have to take a lock.
//
// This unique pointer will cleanup after itself when this object goes
// away, so there is no need to currently have it destroy itself
// immediately upon disconnect.
// connection_sp.reset();
return status;
}
return eConnectionStatusNoConnection;
}
bool Communication::IsConnected() const {
lldb::ConnectionSP connection_sp(m_connection_sp);
return (connection_sp ? connection_sp->IsConnected() : false);
}
bool Communication::HasConnection() const {
return m_connection_sp.get() != nullptr;
}
size_t Communication::Read(void *dst, size_t dst_len,
const Timeout<std::micro> &timeout,
ConnectionStatus &status, Status *error_ptr) {
Log *log = GetLog(LLDBLog::Communication);
LLDB_LOG(
log,
"this = {0}, dst = {1}, dst_len = {2}, timeout = {3}, connection = {4}",
this, dst, dst_len, timeout, m_connection_sp.get());
return ReadFromConnection(dst, dst_len, timeout, status, error_ptr);
}
size_t Communication::Write(const void *src, size_t src_len,
ConnectionStatus &status, Status *error_ptr) {
lldb::ConnectionSP connection_sp(m_connection_sp);
std::lock_guard<std::mutex> guard(m_write_mutex);
LLDB_LOG(GetLog(LLDBLog::Communication),
"{0} Communication::Write (src = {1}, src_len = {2}"
") connection = {3}",
this, src, (uint64_t)src_len, connection_sp.get());
if (connection_sp)
return connection_sp->Write(src, src_len, status, error_ptr);
if (error_ptr)
*error_ptr = Status::FromErrorString("Invalid connection.");
status = eConnectionStatusNoConnection;
return 0;
}
size_t Communication::WriteAll(const void *src, size_t src_len,
ConnectionStatus &status, Status *error_ptr) {
size_t total_written = 0;
do
total_written += Write(static_cast<const char *>(src) + total_written,
src_len - total_written, status, error_ptr);
while (status == eConnectionStatusSuccess && total_written < src_len);
return total_written;
}
size_t Communication::ReadFromConnection(void *dst, size_t dst_len,
const Timeout<std::micro> &timeout,
ConnectionStatus &status,
Status *error_ptr) {
lldb::ConnectionSP connection_sp(m_connection_sp);
if (connection_sp)
return connection_sp->Read(dst, dst_len, timeout, status, error_ptr);
if (error_ptr)
*error_ptr = Status::FromErrorString("Invalid connection.");
status = eConnectionStatusNoConnection;
return 0;
}
void Communication::SetConnection(std::unique_ptr<Connection> connection) {
Disconnect(nullptr);
m_connection_sp = std::move(connection);
}
std::string
Communication::ConnectionStatusAsString(lldb::ConnectionStatus status) {
switch (status) {
case eConnectionStatusSuccess:
return "success";
case eConnectionStatusError:
return "error";
case eConnectionStatusTimedOut:
return "timed out";
case eConnectionStatusNoConnection:
return "no connection";
case eConnectionStatusLostConnection:
return "lost connection";
case eConnectionStatusEndOfFile:
return "end of file";
case eConnectionStatusInterrupted:
return "interrupted";
}
return "@" + std::to_string(status);
}
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