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|
use grate::tracing;
use windows::{
Win32::{
Foundation,
System::Services,
},
core::{
HSTRING,
PWSTR,
},
};
lazy_static::lazy_static! {
static ref PSQL_REGEX: regex::Regex = regex::Regex::new(r#"^(?:postgresql|psql|postgres)-.*([\d\.]*)"#).unwrap();
}
pub fn ensure_postgres_started() -> windows::core::Result<bool> {
let sc_manager = unsafe {
Services::OpenSCManagerW(
None,
None,
(Foundation::GENERIC_READ | Foundation::GENERIC_WRITE).0,
)?
};
let Some(svc) = get_psql_service(sc_manager)? else {
return Ok(false);
};
match svc.status.dwCurrentState {
Services::SERVICE_RUNNING => {
tracing::info!("postgres was already running, done");
return Ok(false);
},
Services::SERVICE_START_PENDING => {
tracing::info!("postgres was already in startup, done");
return Ok(false);
},
_ => {
tracing::info!("postgres is not running: starting it")
},
}
unsafe {
let service =
Services::OpenServiceW(sc_manager, &HSTRING::from(&svc.name), Services::SERVICE_START)?;
Services::StartServiceW(service, None)?;
tracing::info!("started postgres service");
Services::CloseServiceHandle(service)?;
Services::CloseServiceHandle(sc_manager)?;
}
Ok(true)
}
pub fn shutdown_postgres() -> windows::core::Result<()> {
let sc_manager = unsafe {
Services::OpenSCManagerW(
None,
None,
(Foundation::GENERIC_READ | Foundation::GENERIC_WRITE).0,
)
}?;
let Some(svc) = get_psql_service(sc_manager)? else {
tracing::warn!("wasn't able to find postgres service");
return Ok(());
};
if svc.status.dwCurrentState != Services::SERVICE_RUNNING {
tracing::warn!("postgres wasn't in running state, not attempting to shut it down");
return Ok(());
}
let service = unsafe {
Services::OpenServiceW(sc_manager, &HSTRING::from(&svc.name), Services::SERVICE_STOP)
}?;
let mut params = Services::SERVICE_CONTROL_STATUS_REASON_PARAMSW {
dwReason: Services::SERVICE_STOP_REASON_FLAG_PLANNED
| Services::SERVICE_STOP_REASON_MAJOR_NONE
| Services::SERVICE_STOP_REASON_MINOR_NONE,
pszComment: PWSTR::null(),
ServiceStatus: Services::SERVICE_STATUS_PROCESS::default(),
};
unsafe {
Services::ControlServiceExW(
service,
Services::SERVICE_CONTROL_STOP,
Services::SERVICE_CONTROL_STATUS_REASON_INFO,
&mut params as *mut _ as _,
)?;
}
tracing::info!("stopped postgres service");
unsafe {
Services::CloseServiceHandle(service)?;
Services::CloseServiceHandle(sc_manager)?;
}
Ok(())
}
pub fn get_psql_service(
sc_manager: Services::SC_HANDLE,
) -> windows::core::Result<Option<ServiceStatus>> {
let services = list_services(sc_manager)?;
let mut psql_services =
services.into_iter().filter(|status| PSQL_REGEX.is_match(&status.name)).collect::<Vec<_>>();
match psql_services.len() {
1 => {},
0 => {
tracing::warn!("unable to identify an installed postgres service");
return Ok(None);
},
other => {
tracing::warn!(n_candidates = other, "unable to identify postgres service");
return Ok(None);
},
}
let svc = psql_services.remove(0);
tracing::debug!(name = %svc.name, "identified postgres service");
Ok(Some(svc))
}
const RESULT_SIZE: usize = size_of::<Services::ENUM_SERVICE_STATUS_PROCESSW>();
pub struct ServiceStatus {
pub display_name: String,
pub name: String,
pub status: Services::SERVICE_STATUS_PROCESS,
}
pub fn list_services(sc_manager: Services::SC_HANDLE) -> windows::core::Result<Vec<ServiceStatus>> {
let mut bytes_needed: u32 = 0;
let mut services_returned: u32 = 0;
let mut resume = 0;
let mut svcs = vec![];
loop {
let mut data = [0u8; 256 * 1024];
let result = unsafe {
Services::EnumServicesStatusExW(
sc_manager,
Services::SC_ENUM_PROCESS_INFO,
Services::SERVICE_WIN32,
Services::SERVICE_STATE_ALL,
Some(&mut data),
&mut bytes_needed as *mut _,
&mut services_returned as *mut _,
Some(&mut resume),
None,
)
};
if let Err(ref e) = result
&& e.code() != Foundation::ERROR_MORE_DATA.to_hresult()
{
return result.map(|_| unreachable!());
}
let data = bytemuck::cast_slice::<u8, [u8; RESULT_SIZE]>(
&data[..services_returned as usize * RESULT_SIZE],
);
let elems = data
.iter()
.map(|x| unsafe {
core::mem::transmute::<_, Services::ENUM_SERVICE_STATUS_PROCESSW>(*x)
})
.map(|x| ServiceStatus {
display_name: unsafe { x.lpDisplayName.to_string() }.unwrap(),
name: unsafe { x.lpServiceName.to_string() }.unwrap(),
status: x.ServiceStatusProcess,
});
svcs.extend(elems);
if result.is_ok() {
break;
}
}
Ok(svcs)
}
|
