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/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2019 SUSE LINUX GmbH
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#define dout_context cct
#define dout_subsys ceph_subsys_
#include "common/debug.h"
#include "common/errno.h"
#include "common/win32/service.h"
// Initialize the singleton service instance.
ServiceBase *ServiceBase::s_service = NULL;
ServiceBase::ServiceBase(CephContext *cct_): cct(cct_)
{
status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
status.dwCurrentState = SERVICE_START_PENDING;
status.dwWin32ExitCode = NO_ERROR;
status.dwCheckPoint = 0;
/* The estimated time required for the stop operation in ms. */
status.dwWaitHint = 0;
}
/* Register service action callbacks */
int ServiceBase::initialize(ServiceBase *service)
{
s_service = service;
SERVICE_TABLE_ENTRY service_table[] = {
{"", (LPSERVICE_MAIN_FUNCTION)run},
{NULL, NULL}
};
/* StartServiceCtrlDispatcher blocks until the service is stopped. */
if (!StartServiceCtrlDispatcher(service_table)) {
int err = GetLastError();
lderr(service->cct) << "StartServiceCtrlDispatcher error: "
<< err << dendl;
return -EINVAL;
}
return 0;
}
void WINAPI ServiceBase::run()
{
assert(s_service != NULL);
/* Register the control handler. This function is called by the service
* manager to stop the service. The service name that we're passing here
* doesn't have to be valid as we're using SERVICE_WIN32_OWN_PROCESS. */
s_service->hstatus = RegisterServiceCtrlHandler(
"", (LPHANDLER_FUNCTION)control_handler);
if (!s_service->hstatus) {
lderr(s_service->cct) << "Could not initialize service control handler. "
<< "Error: " << GetLastError() << dendl;
return;
}
s_service->set_status(SERVICE_START_PENDING);
// TODO: should we expect exceptions?
ldout(s_service->cct, 0) << "Starting service." << dendl;
int err = s_service->run_hook();
if (err) {
lderr(s_service->cct) << "Failed to start service. Error code: "
<< err << dendl;
s_service->shutdown(true);
} else {
ldout(s_service->cct, 0) << "Successfully started service." << dendl;
s_service->set_status(SERVICE_RUNNING);
}
}
void ServiceBase::shutdown(bool ignore_errors)
{
DWORD original_state = status.dwCurrentState;
set_status(SERVICE_STOP_PENDING);
int err = shutdown_hook();
if (err) {
derr << "Shutdown service hook failed. Error code: " << err << dendl;
if (ignore_errors) {
derr << "Ignoring shutdown hook failure, marking the service as stopped."
<< dendl;
set_status(SERVICE_STOPPED);
} else {
derr << "Reverting to original service state." << dendl;
set_status(original_state);
}
} else {
dout(0) << "Shutdown hook completed." << dendl;
set_status(SERVICE_STOPPED);
}
}
void ServiceBase::stop()
{
DWORD original_state = status.dwCurrentState;
set_status(SERVICE_STOP_PENDING);
int err = stop_hook();
if (err) {
derr << "Service stop hook failed. Error code: " << err << dendl;
set_status(original_state);
} else {
dout(0) << "Successfully stopped service." << dendl;
set_status(SERVICE_STOPPED);
}
}
/* This function is registered with the Windows services manager through
* a call to RegisterServiceCtrlHandler() and will be called by the Windows
* service manager asynchronously to stop the service. */
void ServiceBase::control_handler(DWORD request)
{
switch (request) {
case SERVICE_CONTROL_STOP:
s_service->stop();
break;
case SERVICE_CONTROL_SHUTDOWN:
s_service->shutdown();
break;
default:
break;
}
}
void ServiceBase::set_status(DWORD current_state, DWORD exit_code) {
static DWORD dwCheckPoint = 1;
if (current_state == SERVICE_RUNNING || current_state == SERVICE_STOPPED) {
status.dwCheckPoint = dwCheckPoint++;
}
status.dwCurrentState = current_state;
status.dwWin32ExitCode = exit_code;
if (hstatus) {
dout(5) << "Updating service service status (" << current_state
<< ") and exit code(" << exit_code << ")." << dendl;
::SetServiceStatus(hstatus, &status);
} else {
derr << "Service control handler not initialized. Cannot "
<< "update service status (" << current_state
<< ") and exit code(" << exit_code << ")." << dendl;
}
}
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