| #![allow(clippy::too_many_arguments)] |
| |
| extern crate pq_sys; |
| |
| use self::pq_sys::*; |
| use std::ffi::{CStr, CString}; |
| use std::os::raw as libc; |
| use std::ptr::NonNull; |
| use std::{ptr, str}; |
| |
| use crate::result::*; |
| |
| #[allow(missing_debug_implementations, missing_copy_implementations)] |
| pub struct RawConnection { |
| internal_connection: NonNull<PGconn>, |
| } |
| |
| impl RawConnection { |
| pub fn establish(database_url: &str) -> ConnectionResult<Self> { |
| use self::ConnStatusType::*; |
| |
| let connection_string = CString::new(database_url)?; |
| let connection_ptr = unsafe { PQconnectdb(connection_string.as_ptr()) }; |
| let connection_status = unsafe { PQstatus(connection_ptr) }; |
| |
| match connection_status { |
| CONNECTION_OK => { |
| let connection_ptr = unsafe { NonNull::new_unchecked(connection_ptr) }; |
| Ok(RawConnection { |
| internal_connection: connection_ptr, |
| }) |
| } |
| _ => { |
| let message = last_error_message(connection_ptr); |
| |
| if !connection_ptr.is_null() { |
| // Note that even if the server connection attempt fails (as indicated by PQstatus), |
| // the application should call PQfinish to free the memory used by the PGconn object. |
| // https://www.postgresql.org/docs/current/libpq-connect.html |
| unsafe { PQfinish(connection_ptr) } |
| } |
| |
| Err(ConnectionError::BadConnection(message)) |
| } |
| } |
| } |
| |
| pub fn last_error_message(&self) -> String { |
| last_error_message(self.internal_connection.as_ptr()) |
| } |
| |
| pub fn set_notice_processor(&self, notice_processor: NoticeProcessor) { |
| unsafe { |
| PQsetNoticeProcessor( |
| self.internal_connection.as_ptr(), |
| Some(notice_processor), |
| ptr::null_mut(), |
| ); |
| } |
| } |
| |
| pub unsafe fn exec(&self, query: *const libc::c_char) -> QueryResult<RawResult> { |
| RawResult::new(PQexec(self.internal_connection.as_ptr(), query), self) |
| } |
| |
| pub unsafe fn exec_prepared( |
| &self, |
| stmt_name: *const libc::c_char, |
| param_count: libc::c_int, |
| param_values: *const *const libc::c_char, |
| param_lengths: *const libc::c_int, |
| param_formats: *const libc::c_int, |
| result_format: libc::c_int, |
| ) -> QueryResult<RawResult> { |
| let ptr = PQexecPrepared( |
| self.internal_connection.as_ptr(), |
| stmt_name, |
| param_count, |
| param_values, |
| param_lengths, |
| param_formats, |
| result_format, |
| ); |
| RawResult::new(ptr, self) |
| } |
| |
| pub unsafe fn prepare( |
| &self, |
| stmt_name: *const libc::c_char, |
| query: *const libc::c_char, |
| param_count: libc::c_int, |
| param_types: *const Oid, |
| ) -> QueryResult<RawResult> { |
| let ptr = PQprepare( |
| self.internal_connection.as_ptr(), |
| stmt_name, |
| query, |
| param_count, |
| param_types, |
| ); |
| RawResult::new(ptr, self) |
| } |
| } |
| |
| pub type NoticeProcessor = extern "C" fn(arg: *mut libc::c_void, message: *const libc::c_char); |
| |
| impl Drop for RawConnection { |
| fn drop(&mut self) { |
| unsafe { PQfinish(self.internal_connection.as_ptr()) }; |
| } |
| } |
| |
| fn last_error_message(conn: *const PGconn) -> String { |
| unsafe { |
| let error_ptr = PQerrorMessage(conn); |
| let bytes = CStr::from_ptr(error_ptr).to_bytes(); |
| String::from_utf8_lossy(bytes).to_string() |
| } |
| } |
| |
| /// Internal wrapper around a `*mut PGresult` which is known to be not-null, and |
| /// have no aliases. This wrapper is to ensure that it's always properly |
| /// dropped. |
| /// |
| /// If `Unique` is ever stabilized, we should use it here. |
| #[allow(missing_debug_implementations)] |
| pub struct RawResult(NonNull<PGresult>); |
| |
| unsafe impl Send for RawResult {} |
| unsafe impl Sync for RawResult {} |
| |
| impl RawResult { |
| #[allow(clippy::new_ret_no_self)] |
| fn new(ptr: *mut PGresult, conn: &RawConnection) -> QueryResult<Self> { |
| NonNull::new(ptr).map(RawResult).ok_or_else(|| { |
| Error::DatabaseError( |
| DatabaseErrorKind::UnableToSendCommand, |
| Box::new(conn.last_error_message()), |
| ) |
| }) |
| } |
| |
| pub fn as_ptr(&self) -> *mut PGresult { |
| self.0.as_ptr() |
| } |
| |
| pub fn error_message(&self) -> &str { |
| let ptr = unsafe { PQresultErrorMessage(self.0.as_ptr()) }; |
| let cstr = unsafe { CStr::from_ptr(ptr) }; |
| cstr.to_str().unwrap_or_default() |
| } |
| } |
| |
| impl Drop for RawResult { |
| fn drop(&mut self) { |
| unsafe { PQclear(self.0.as_ptr()) } |
| } |
| } |