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// Copyright (c) 2021-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <common/args.h>
#include <common/system.h>
#include <interfaces/init.h>
#include <interfaces/ipc.h>
#include <ipc/capnp/protocol.h>
#include <ipc/process.h>
#include <ipc/protocol.h>
#include <logging.h>
#include <tinyformat.h>
#include <util/fs.h>
#include <cstdio>
#include <cstdlib>
#include <functional>
#include <memory>
#include <stdexcept>
#include <string.h>
#include <string>
#include <unistd.h>
#include <utility>
#include <vector>
namespace ipc {
namespace {
class IpcImpl : public interfaces::Ipc
{
public:
IpcImpl(const char* exe_name, const char* process_argv0, interfaces::Init& init)
: m_exe_name(exe_name), m_process_argv0(process_argv0), m_init(init),
m_protocol(ipc::capnp::MakeCapnpProtocol()), m_process(ipc::MakeProcess())
{
}
std::unique_ptr<interfaces::Init> spawnProcess(const char* new_exe_name) override
{
int pid;
int fd = m_process->spawn(new_exe_name, m_process_argv0, pid);
LogDebug(::BCLog::IPC, "Process %s pid %i launched\n", new_exe_name, pid);
auto init = m_protocol->connect(fd, m_exe_name);
Ipc::addCleanup(*init, [this, new_exe_name, pid] {
int status = m_process->waitSpawned(pid);
LogDebug(::BCLog::IPC, "Process %s pid %i exited with status %i\n", new_exe_name, pid, status);
});
return init;
}
bool startSpawnedProcess(int argc, char* argv[], int& exit_status) override
{
exit_status = EXIT_FAILURE;
int32_t fd = -1;
if (!m_process->checkSpawned(argc, argv, fd)) {
return false;
}
m_protocol->serve(fd, m_exe_name, m_init);
exit_status = EXIT_SUCCESS;
return true;
}
std::unique_ptr<interfaces::Init> connectAddress(std::string& address) override
{
if (address.empty() || address == "0") return nullptr;
int fd;
if (address == "auto") {
// Treat "auto" the same as "unix" except don't treat it an as error
// if the connection is not accepted. Just return null so the caller
// can work offline without a connection, or spawn a new
// bitcoin-node process and connect to it.
address = "unix";
try {
fd = m_process->connect(gArgs.GetDataDirNet(), "bitcoin-node", address);
} catch (const std::system_error& e) {
// If connection type is auto and socket path isn't accepting connections, or doesn't exist, catch the error and return null;
if (e.code() == std::errc::connection_refused || e.code() == std::errc::no_such_file_or_directory) {
return nullptr;
}
throw;
}
} else {
fd = m_process->connect(gArgs.GetDataDirNet(), "bitcoin-node", address);
}
return m_protocol->connect(fd, m_exe_name);
}
void listenAddress(std::string& address) override
{
int fd = m_process->bind(gArgs.GetDataDirNet(), m_exe_name, address);
m_protocol->listen(fd, m_exe_name, m_init);
}
void addCleanup(std::type_index type, void* iface, std::function<void()> cleanup) override
{
m_protocol->addCleanup(type, iface, std::move(cleanup));
}
Context& context() override { return m_protocol->context(); }
const char* m_exe_name;
const char* m_process_argv0;
interfaces::Init& m_init;
std::unique_ptr<Protocol> m_protocol;
std::unique_ptr<Process> m_process;
};
} // namespace
} // namespace ipc
namespace interfaces {
std::unique_ptr<Ipc> MakeIpc(const char* exe_name, const char* process_argv0, Init& init)
{
return std::make_unique<ipc::IpcImpl>(exe_name, process_argv0, init);
}
} // namespace interfaces
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