69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package util
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import (
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"fmt"
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"os"
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"runtime"
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"codeberg.org/gruf/go-errors/v2"
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)
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// Must executes 'fn' repeatedly until
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// it successfully returns without panic.
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func Must(fn func()) {
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if fn == nil {
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panic("nil func")
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}
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for !func() (done bool) {
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defer func() {
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if r := recover(); r != nil {
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// Gather calling func frames.
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pcs := make([]uintptr, 10)
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n := runtime.Callers(3, pcs)
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i := runtime.CallersFrames(pcs[:n])
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c := gatherFrames(i, n)
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const msg = "recovered panic: %v\n\n%s\n"
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fmt.Fprintf(os.Stderr, msg, r, c.String())
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}
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}()
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fn()
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done = true
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return
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}() { //nolint
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}
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}
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// gatherFrames collates runtime frames from a frame iterator.
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func gatherFrames(iter *runtime.Frames, n int) errors.Callers {
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if iter == nil {
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return nil
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}
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frames := make([]runtime.Frame, 0, n)
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for {
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f, ok := iter.Next()
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if !ok {
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break
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}
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frames = append(frames, f)
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}
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return frames
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}
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