92 lines
2.7 KiB
Go
92 lines
2.7 KiB
Go
/*
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* Copyright (C) 2020-2022, IrineSistiana
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*
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* This file is part of mosdns.
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*
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* mosdns 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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* mosdns 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 <https://www.gnu.org/licenses/>.
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*/
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package sleep
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import (
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"context"
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"strconv"
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"time"
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"github.com/IrineSistiana/mosdns/v5/coremain"
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"github.com/IrineSistiana/mosdns/v5/pkg/pool"
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"github.com/IrineSistiana/mosdns/v5/pkg/query_context"
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"github.com/IrineSistiana/mosdns/v5/plugin/executable/sequence"
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)
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const PluginType = "sleep"
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func init() {
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// Register this plugin type with its initialization funcs. So that, this plugin
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// can be configured by user from configuration file.
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coremain.RegNewPluginFunc(PluginType, Init, func() any { return new(Args) })
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// You can also register a plugin object directly. (If plugin do not need to configure)
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// Then you can directly use "_sleep_500ms" in configuration file.
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coremain.RegNewPersetPluginFunc("_sleep_500ms", func(bp *coremain.BP) (any, error) {
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return &sleep{d: time.Millisecond * 500}, nil
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})
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// You can register a quick setup func for sequence. So that users can
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// init your plugin in the sequence directly in one string.
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sequence.MustRegExecQuickSetup(PluginType, QuickSetup)
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}
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// Args is the arguments of plugin. It will be decoded from yaml.
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// So it is recommended to use `yaml` as struct field's tag.
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type Args struct {
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Duration uint `yaml:"duration"` // (milliseconds) duration for sleep.
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}
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var _ sequence.Executable = (*sleep)(nil)
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// sleep implements handler.ExecutablePlugin.
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type sleep struct {
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d time.Duration
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}
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// Exec implements handler.Executable.
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func (s *sleep) Exec(ctx context.Context, qCtx *query_context.Context) error {
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if s.d > 0 {
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timer := pool.GetTimer(s.d)
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defer pool.ReleaseTimer(timer)
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select {
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case <-timer.C:
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case <-ctx.Done():
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return context.Cause(ctx)
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}
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}
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return nil
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}
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func Init(_ *coremain.BP, args any) (any, error) {
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d := args.(*Args).Duration
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return &sleep{
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d: time.Duration(d) * time.Millisecond,
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}, nil
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}
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func QuickSetup(_ sequence.BQ, s string) (any, error) {
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n, err := strconv.Atoi(s)
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if err != nil {
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return nil, err
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}
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return &sleep{d: time.Duration(n) * time.Millisecond}, nil
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}
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