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https://github.com/go-gitea/gitea
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Before there was a "graceful function": RunWithShutdownFns, it's mainly for some modules which doesn't support context. The old queue system doesn't work well with context, so the old queues need it. After the queue refactoring, the new queue works with context well, so, use Golang context as much as possible, the `RunWithShutdownFns` could be removed (replaced by RunWithCancel for context cancel mechanism), the related code could be simplified. This PR also fixes some legacy queue-init problems, eg: * typo : archiver: "unable to create codes indexer queue" => "unable to create repo-archive queue" * no nil check for failed queues, which causes unfriendly panic After this PR, many goroutines could have better display name: ![image](https://github.com/go-gitea/gitea/assets/2114189/701b2a9b-8065-4137-aeaa-0bda2b34604a) ![image](https://github.com/go-gitea/gitea/assets/2114189/f1d5f50f-0534-40f0-b0be-f2c9daa5fe92)
227 lines
7.4 KiB
Go
227 lines
7.4 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package process
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import (
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"context"
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"log"
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"runtime/pprof"
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"strconv"
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"sync"
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"time"
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)
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// TODO: This packages still uses a singleton for the Manager.
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// Once there's a decent web framework and dependencies are passed around like they should,
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// then we delete the singleton.
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var (
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manager *Manager
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managerInit sync.Once
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// DefaultContext is the default context to run processing commands in
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DefaultContext = context.Background()
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)
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// DescriptionPProfLabel is a label set on goroutines that have a process attached
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const DescriptionPProfLabel = "process-description"
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// PIDPProfLabel is a label set on goroutines that have a process attached
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const PIDPProfLabel = "pid"
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// PPIDPProfLabel is a label set on goroutines that have a process attached
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const PPIDPProfLabel = "ppid"
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// ProcessTypePProfLabel is a label set on goroutines that have a process attached
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const ProcessTypePProfLabel = "process-type"
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// IDType is a pid type
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type IDType string
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// FinishedFunc is a function that marks that the process is finished and can be removed from the process table
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// - it is simply an alias for context.CancelFunc and is only for documentary purposes
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type FinishedFunc = context.CancelFunc
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var Trace = defaultTrace // this global can be overridden by particular logging packages - thus avoiding import cycles
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func defaultTrace(start bool, pid IDType, description string, parentPID IDType, typ string) {
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if start && parentPID != "" {
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log.Printf("start process %s: %s (from %s) (%s)", pid, description, parentPID, typ)
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} else if start {
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log.Printf("start process %s: %s (%s)", pid, description, typ)
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} else {
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log.Printf("end process %s: %s", pid, description)
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}
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}
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// Manager manages all processes and counts PIDs.
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type Manager struct {
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mutex sync.Mutex
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next int64
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lastTime int64
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processMap map[IDType]*process
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}
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// GetManager returns a Manager and initializes one as singleton if there's none yet
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func GetManager() *Manager {
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managerInit.Do(func() {
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manager = &Manager{
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processMap: make(map[IDType]*process),
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next: 1,
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}
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})
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return manager
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}
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// AddContext creates a new context and adds it as a process. Once the process is finished, finished must be called
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// to remove the process from the process table. It should not be called until the process is finished but must always be called.
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//
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// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
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// finished will cancel the returned context and remove it from the process table.
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//
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// Most processes will not need to use the cancel function but there will be cases whereby you want to cancel the process but not immediately remove it from the
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// process table.
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func (pm *Manager) AddContext(parent context.Context, description string) (ctx context.Context, cancel context.CancelFunc, finished FinishedFunc) {
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ctx, cancel = context.WithCancel(parent)
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ctx, _, finished = pm.Add(ctx, description, cancel, NormalProcessType, true)
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return ctx, cancel, finished
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}
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// AddTypedContext creates a new context and adds it as a process. Once the process is finished, finished must be called
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// to remove the process from the process table. It should not be called until the process is finished but must always be called.
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//
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// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
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// finished will cancel the returned context and remove it from the process table.
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//
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// Most processes will not need to use the cancel function but there will be cases whereby you want to cancel the process but not immediately remove it from the
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// process table.
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func (pm *Manager) AddTypedContext(parent context.Context, description, processType string, currentlyRunning bool) (ctx context.Context, cancel context.CancelFunc, finished FinishedFunc) {
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ctx, cancel = context.WithCancel(parent)
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ctx, _, finished = pm.Add(ctx, description, cancel, processType, currentlyRunning)
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return ctx, cancel, finished
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}
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// AddContextTimeout creates a new context and add it as a process. Once the process is finished, finished must be called
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// to remove the process from the process table. It should not be called until the process is finished but must always be called.
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//
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// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
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// finished will cancel the returned context and remove it from the process table.
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//
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// Most processes will not need to use the cancel function but there will be cases whereby you want to cancel the process but not immediately remove it from the
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// process table.
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func (pm *Manager) AddContextTimeout(parent context.Context, timeout time.Duration, description string) (ctx context.Context, cancel context.CancelFunc, finshed FinishedFunc) {
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if timeout <= 0 {
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// it's meaningless to use timeout <= 0, and it must be a bug! so we must panic here to tell developers to make the timeout correct
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panic("the timeout must be greater than zero, otherwise the context will be cancelled immediately")
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}
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ctx, cancel = context.WithTimeout(parent, timeout)
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ctx, _, finshed = pm.Add(ctx, description, cancel, NormalProcessType, true)
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return ctx, cancel, finshed
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}
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// Add create a new process
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func (pm *Manager) Add(ctx context.Context, description string, cancel context.CancelFunc, processType string, currentlyRunning bool) (context.Context, IDType, FinishedFunc) {
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parentPID := GetParentPID(ctx)
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pm.mutex.Lock()
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start, pid := pm.nextPID()
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parent := pm.processMap[parentPID]
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if parent == nil {
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parentPID = ""
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}
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process := &process{
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PID: pid,
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ParentPID: parentPID,
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Description: description,
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Start: start,
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Cancel: cancel,
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Type: processType,
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}
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var finished FinishedFunc
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if currentlyRunning {
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finished = func() {
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cancel()
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pm.remove(process)
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pprof.SetGoroutineLabels(ctx)
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}
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} else {
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finished = func() {
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cancel()
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pm.remove(process)
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}
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}
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pm.processMap[pid] = process
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pm.mutex.Unlock()
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Trace(true, pid, description, parentPID, processType)
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pprofCtx := pprof.WithLabels(ctx, pprof.Labels(DescriptionPProfLabel, description, PPIDPProfLabel, string(parentPID), PIDPProfLabel, string(pid), ProcessTypePProfLabel, processType))
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if currentlyRunning {
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pprof.SetGoroutineLabels(pprofCtx)
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}
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return &Context{
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Context: pprofCtx,
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pid: pid,
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}, pid, finished
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}
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// nextPID will return the next available PID. pm.mutex should already be locked.
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func (pm *Manager) nextPID() (start time.Time, pid IDType) {
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start = time.Now()
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startUnix := start.Unix()
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if pm.lastTime == startUnix {
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pm.next++
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} else {
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pm.next = 1
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}
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pm.lastTime = startUnix
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pid = IDType(strconv.FormatInt(start.Unix(), 16))
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if pm.next == 1 {
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return
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}
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pid = IDType(string(pid) + "-" + strconv.FormatInt(pm.next, 10))
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return start, pid
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}
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func (pm *Manager) remove(process *process) {
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deleted := false
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pm.mutex.Lock()
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if pm.processMap[process.PID] == process {
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delete(pm.processMap, process.PID)
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deleted = true
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}
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pm.mutex.Unlock()
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if deleted {
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Trace(false, process.PID, process.Description, process.ParentPID, process.Type)
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}
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}
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// Cancel a process in the ProcessManager.
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func (pm *Manager) Cancel(pid IDType) {
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pm.mutex.Lock()
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process, ok := pm.processMap[pid]
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pm.mutex.Unlock()
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if ok && process.Type != SystemProcessType {
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process.Cancel()
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}
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}
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