2cbce963b7
It's valuable to check your runtime values and to shut down the entire engine in case something doesn't match. This patch adds some magic plumbing to support a "panic" mechanism. A new "panic" statement gets transparently converted into a panic function and panic resource. The former errors if the input is not empty. The latter must be present to consume the value, but doesn't actually do anything.
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
// Mgmt
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// Copyright (C) 2013-2023+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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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 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"fmt"
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"github.com/purpleidea/mgmt/lang/funcs/simple"
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"github.com/purpleidea/mgmt/lang/types"
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)
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func init() {
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simple.Register("panic", &types.FuncValue{
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T: types.NewType("func(x str) str"),
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V: Panic,
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})
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}
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// Panic returns an error when it receives a non-empty string. The error should
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// cause the function engine to shutdown.
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func Panic(input []types.Value) (types.Value, error) {
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if s := input[0].Str(); s != "" {
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// This StrValue not really used here, since we error...
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return &types.StrValue{
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V: s,
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}, fmt.Errorf("panic occurred: %s", s)
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}
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return &types.StrValue{
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V: "panic", // name can't be empty
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}, nil
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}
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