e3c3b33ea7
* Change graceful to use a singleton obtained through GetManager instead of a global. * Graceful: Make TestPullRequests shutdownable * Graceful: Make the cron tasks graceful * Graceful: AddTestPullRequest run in graceful ctx * Graceful: SyncMirrors shutdown * Graceful: SetDefaultContext for Xorm to be HammerContext * Avoid starting graceful for migrate commands and checkout * Graceful: DeliverHooks now can be shutdown * Fix multiple syncing errors in modules/sync/UniqueQueue & Make UniqueQueue closable * Begin the process of making the repo indexer shutdown gracefully
90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package graceful
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import (
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"context"
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"fmt"
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"time"
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)
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// Errors for context.Err()
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var (
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ErrShutdown = fmt.Errorf("Graceful Manager called Shutdown")
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ErrHammer = fmt.Errorf("Graceful Manager called Hammer")
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ErrTerminate = fmt.Errorf("Graceful Manager called Terminate")
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)
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// ChannelContext is a context that wraps a channel and error as a context
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type ChannelContext struct {
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done <-chan struct{}
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err error
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}
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// NewChannelContext creates a ChannelContext from a channel and error
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func NewChannelContext(done <-chan struct{}, err error) *ChannelContext {
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return &ChannelContext{
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done: done,
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err: err,
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}
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}
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// Deadline returns the time when work done on behalf of this context
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// should be canceled. There is no Deadline for a ChannelContext
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func (ctx *ChannelContext) Deadline() (deadline time.Time, ok bool) {
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return
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}
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// Done returns the channel provided at the creation of this context.
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// When closed, work done on behalf of this context should be canceled.
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func (ctx *ChannelContext) Done() <-chan struct{} {
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return ctx.done
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}
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// Err returns nil, if Done is not closed. If Done is closed,
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// Err returns the error provided at the creation of this context
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func (ctx *ChannelContext) Err() error {
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select {
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case <-ctx.done:
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return ctx.err
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default:
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return nil
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}
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}
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// Value returns nil for all calls as no values are or can be associated with this context
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func (ctx *ChannelContext) Value(key interface{}) interface{} {
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return nil
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}
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// ShutdownContext returns a context.Context that is Done at shutdown
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// Callers using this context should ensure that they are registered as a running server
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// in order that they are waited for.
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func (g *Manager) ShutdownContext() context.Context {
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return &ChannelContext{
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done: g.IsShutdown(),
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err: ErrShutdown,
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}
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}
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// HammerContext returns a context.Context that is Done at hammer
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// Callers using this context should ensure that they are registered as a running server
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// in order that they are waited for.
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func (g *Manager) HammerContext() context.Context {
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return &ChannelContext{
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done: g.IsHammer(),
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err: ErrHammer,
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}
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}
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// TerminateContext returns a context.Context that is Done at terminate
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// Callers using this context should ensure that they are registered as a terminating server
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// in order that they are waited for.
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func (g *Manager) TerminateContext() context.Context {
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return &ChannelContext{
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done: g.IsTerminate(),
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err: ErrTerminate,
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}
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}
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