error.rs (1444B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2025 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify it under the 6 terms of the GNU Affero General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 TALER is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. 12 13 You should have received a copy of the GNU Affero General Public License along with 14 TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> 15 */ 16 17 /// Error wrapper than display an error with its sources 18 #[derive(Debug)] 19 pub struct FmtSource<E: std::error::Error>(E); 20 21 fn fmt_with_source( 22 f: &mut std::fmt::Formatter<'_>, 23 mut e: &dyn std::error::Error, 24 ) -> std::fmt::Result { 25 loop { 26 write!(f, "{}", &e)?; 27 if let Some(source) = e.source() { 28 write!(f, ": ")?; 29 e = source; 30 } else { 31 return Ok(()); 32 } 33 } 34 } 35 36 impl<E: std::error::Error> std::fmt::Display for FmtSource<E> { 37 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { 38 fmt_with_source(f, &self.0) 39 } 40 } 41 42 impl<E: std::error::Error> From<E> for FmtSource<E> { 43 fn from(value: E) -> Self { 44 Self(value) 45 } 46 }