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Add the ClientAuthentication_hook #2231

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23 changes: 23 additions & 0 deletions pgrx-examples/hooks/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,10 @@ use pgrx::prelude::*;

::pgrx::pg_module_magic!(name, version);

fn knock_knock() {
todo!()
}

fn delete_must_have_a_where(query: PgBox<pg_sys::Query>) {
if query.commandType != pg_sys::CmdType::CMD_DELETE {
return ();
Expand All @@ -33,6 +37,25 @@ fn only_superusers_can_truncate(pstmt: PgBox<pg_sys::PlannedStmt>) {
}

unsafe fn register_hooks() {

//
// Client Authentication hook
//
static mut PREV_CLIENTAUTHENTICATION_HOOK: pg_sys::libpq::ClientAuthentication_hook_type = None;
PREV_CLIENTAUTHENTICATION_HOOK = pg_sys::libpq::ClientAuthentication_hook;
pg_sys::libpq::ClientAuthentication_hook = Some(client_authentication_hook);

#[pg_guard]
unsafe extern "C-unwind" fn client_authentication_hook(
port: *mut pg_sys::libpq::be::Port,
status: i32,
) {
knock_knock();
if let Some(prev_hook) = PREV_CLIENTAUTHENTICATION_HOOK {
pg_guard_ffi_boundary(|| prev_hook(port, status));
}
}

//
// Post Parse Analyze hook
//
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10 changes: 10 additions & 0 deletions pgrx-pg-sys/src/libpq.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -203,3 +203,13 @@ pub mod be {
raw_buf_remaining: isize,
}
}

// The ClientAuthentication Hook cannot be implemented simply with bindgen
/// Hook type to get control in ClientAuthentication()
pub type ClientAuthentication_hook_type =
Option<unsafe extern "C-unwind" fn(port: *mut be::Port, status: i32)>;

#[pgrx_macros::pg_guard]
unsafe extern "C-unwind" {
pub static mut ClientAuthentication_hook: ClientAuthentication_hook_type;
}
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