mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2025-01-21 16:55:06 -05:00
3f44b97b5f
- For every process that is spawned (every new non-trivial goroutine such as http requests, queues or tasks) start a [execution tracer](https://pkg.go.dev/runtime/trace). This allows very precise diagnosis of how each individual process over a time period. - It's safe and [fast](https://go.dev/blog/execution-traces-2024#low-overhead-tracing) to be run in production, hence no setting to disable this. There's only noticable overhead when tracing is actually performed and not continuous. - Proper tracing support would mean the codebase would be full of `trace.WithRegion` and `trace.Log`, which feels premature for this patch as there's no real-world usage yet to indicate which places would need this the most. So far only Git commands and SQL queries receive somewhat proper tracing support given that these are used throughout the codebase. - Make git commands a new process type. - Add tracing to diagnosis zip file.
260 lines
9.3 KiB
Go
260 lines
9.3 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
|
|
// Copyright 2019 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
package process
|
|
|
|
import (
|
|
"context"
|
|
"runtime/pprof"
|
|
"runtime/trace"
|
|
"strconv"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
)
|
|
|
|
// TODO: This packages still uses a singleton for the Manager.
|
|
// Once there's a decent web framework and dependencies are passed around like they should,
|
|
// then we delete the singleton.
|
|
|
|
var (
|
|
manager *Manager
|
|
managerInit sync.Once
|
|
|
|
// DefaultContext is the default context to run processing commands in
|
|
DefaultContext = context.Background()
|
|
)
|
|
|
|
// DescriptionPProfLabel is a label set on goroutines that have a process attached
|
|
const DescriptionPProfLabel = "processDescription"
|
|
|
|
// PIDPProfLabel is a label set on goroutines that have a process attached
|
|
const PIDPProfLabel = "pid"
|
|
|
|
// PPIDPProfLabel is a label set on goroutines that have a process attached
|
|
const PPIDPProfLabel = "ppid"
|
|
|
|
// ProcessTypePProfLabel is a label set on goroutines that have a process attached
|
|
const ProcessTypePProfLabel = "processType"
|
|
|
|
// IDType is a pid type
|
|
type IDType string
|
|
|
|
// FinishedFunc is a function that marks that the process is finished and can be removed from the process table
|
|
// - it is simply an alias for context.CancelFunc and is only for documentary purposes
|
|
type FinishedFunc = context.CancelFunc
|
|
|
|
var (
|
|
traceDisabled atomic.Int64
|
|
TraceCallback = defaultTraceCallback // this global can be overridden by particular logging packages - thus avoiding import cycles
|
|
)
|
|
|
|
// defaultTraceCallback is a no-op. Without a proper TraceCallback (provided by the logger system), this "Trace" level messages shouldn't be outputted.
|
|
func defaultTraceCallback(skip int, start bool, pid IDType, description string, parentPID IDType, typ string) {
|
|
}
|
|
|
|
// TraceLogDisable disables (or revert the disabling) the trace log for the process lifecycle.
|
|
// eg: the logger system shouldn't print the trace log for themselves, that's cycle dependency (Logger -> ProcessManager -> TraceCallback -> Logger ...)
|
|
// Theoretically, such trace log should only be enabled when the logger system is ready with a proper level, so the default TraceCallback is a no-op.
|
|
func TraceLogDisable(v bool) {
|
|
if v {
|
|
traceDisabled.Add(1)
|
|
} else {
|
|
traceDisabled.Add(-1)
|
|
}
|
|
}
|
|
|
|
func Trace(start bool, pid IDType, description string, parentPID IDType, typ string) {
|
|
if traceDisabled.Load() != 0 {
|
|
// the traceDisabled counter is mainly for recursive calls, so no concurrency problem.
|
|
// because the counter can't be 0 since the caller function hasn't returned (decreased the counter) yet.
|
|
return
|
|
}
|
|
TraceCallback(1, start, pid, description, parentPID, typ)
|
|
}
|
|
|
|
// Manager manages all processes and counts PIDs.
|
|
type Manager struct {
|
|
mutex sync.Mutex
|
|
|
|
next int64
|
|
lastTime int64
|
|
|
|
processMap map[IDType]*process
|
|
}
|
|
|
|
// GetManager returns a Manager and initializes one as singleton if there's none yet
|
|
func GetManager() *Manager {
|
|
managerInit.Do(func() {
|
|
manager = &Manager{
|
|
processMap: make(map[IDType]*process),
|
|
next: 1,
|
|
}
|
|
})
|
|
return manager
|
|
}
|
|
|
|
// AddContext creates a new context and adds it as a process. Once the process is finished, finished must be called
|
|
// to remove the process from the process table. It should not be called until the process is finished but must always be called.
|
|
//
|
|
// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
|
|
// finished will cancel the returned context and remove it from the process table.
|
|
//
|
|
// 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
|
|
// process table.
|
|
func (pm *Manager) AddContext(parent context.Context, description string) (ctx context.Context, cancel context.CancelFunc, finished FinishedFunc) {
|
|
ctx, cancel = context.WithCancel(parent)
|
|
|
|
ctx, _, finished = pm.Add(ctx, description, cancel, NormalProcessType, true)
|
|
|
|
return ctx, cancel, finished
|
|
}
|
|
|
|
// AddTypedContext creates a new context and adds it as a process. Once the process is finished, finished must be called
|
|
// to remove the process from the process table. It should not be called until the process is finished but must always be called.
|
|
//
|
|
// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
|
|
// finished will cancel the returned context and remove it from the process table.
|
|
//
|
|
// 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
|
|
// process table.
|
|
func (pm *Manager) AddTypedContext(parent context.Context, description, processType string, currentlyRunning bool) (ctx context.Context, cancel context.CancelFunc, finished FinishedFunc) {
|
|
ctx, cancel = context.WithCancel(parent)
|
|
|
|
ctx, _, finished = pm.Add(ctx, description, cancel, processType, currentlyRunning)
|
|
|
|
return ctx, cancel, finished
|
|
}
|
|
|
|
// AddTypedContextTimeout creates a new context and adds it as a process. Once the process is finished, finished must be called
|
|
// to remove the process from the process table. It should not be called until the process is finished but must always be called.
|
|
//
|
|
// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
|
|
// finished will cancel the returned context and remove it from the process table.
|
|
//
|
|
// 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
|
|
// process table.
|
|
func (pm *Manager) AddTypedContextTimeout(parent context.Context, timeout time.Duration, description, processType string, currentlyRunning bool) (ctx context.Context, cancel context.CancelFunc, finished FinishedFunc) {
|
|
if timeout <= 0 {
|
|
// 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
|
|
panic("the timeout must be greater than zero, otherwise the context will be cancelled immediately")
|
|
}
|
|
|
|
ctx, cancel = context.WithTimeout(parent, timeout)
|
|
|
|
ctx, _, finished = pm.Add(ctx, description, cancel, processType, currentlyRunning)
|
|
|
|
return ctx, cancel, finished
|
|
}
|
|
|
|
// AddContextTimeout creates a new context and add it as a process. Once the process is finished, finished must be called
|
|
// to remove the process from the process table. It should not be called until the process is finished but must always be called.
|
|
//
|
|
// cancel should be used to cancel the returned context, however it will not remove the process from the process table.
|
|
// finished will cancel the returned context and remove it from the process table.
|
|
//
|
|
// 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
|
|
// process table.
|
|
func (pm *Manager) AddContextTimeout(parent context.Context, timeout time.Duration, description string) (ctx context.Context, cancel context.CancelFunc, finished FinishedFunc) {
|
|
return pm.AddTypedContextTimeout(parent, timeout, description, NormalProcessType, true)
|
|
}
|
|
|
|
// Add create a new process
|
|
func (pm *Manager) Add(ctx context.Context, description string, cancel context.CancelFunc, processType string, currentlyRunning bool) (context.Context, IDType, FinishedFunc) {
|
|
parentPID := GetParentPID(ctx)
|
|
|
|
pm.mutex.Lock()
|
|
start, pid := pm.nextPID()
|
|
|
|
parent := pm.processMap[parentPID]
|
|
if parent == nil {
|
|
parentPID = ""
|
|
}
|
|
|
|
ctx, traceTask := trace.NewTask(ctx, processType)
|
|
|
|
process := &process{
|
|
PID: pid,
|
|
ParentPID: parentPID,
|
|
Description: description,
|
|
Start: start,
|
|
Cancel: cancel,
|
|
Type: processType,
|
|
TraceTrask: traceTask,
|
|
}
|
|
|
|
var finished FinishedFunc
|
|
if currentlyRunning {
|
|
finished = func() {
|
|
cancel()
|
|
pm.remove(process)
|
|
pprof.SetGoroutineLabels(ctx)
|
|
}
|
|
} else {
|
|
finished = func() {
|
|
cancel()
|
|
pm.remove(process)
|
|
}
|
|
}
|
|
|
|
pm.processMap[pid] = process
|
|
pm.mutex.Unlock()
|
|
|
|
Trace(true, pid, description, parentPID, processType)
|
|
|
|
pprofCtx := pprof.WithLabels(ctx, pprof.Labels(DescriptionPProfLabel, description, PPIDPProfLabel, string(parentPID), PIDPProfLabel, string(pid), ProcessTypePProfLabel, processType))
|
|
if currentlyRunning {
|
|
pprof.SetGoroutineLabels(pprofCtx)
|
|
}
|
|
|
|
return &Context{
|
|
Context: pprofCtx,
|
|
pid: pid,
|
|
}, pid, finished
|
|
}
|
|
|
|
// nextPID will return the next available PID. pm.mutex should already be locked.
|
|
func (pm *Manager) nextPID() (start time.Time, pid IDType) {
|
|
start = time.Now()
|
|
startUnix := start.Unix()
|
|
if pm.lastTime == startUnix {
|
|
pm.next++
|
|
} else {
|
|
pm.next = 1
|
|
}
|
|
pm.lastTime = startUnix
|
|
pid = IDType(strconv.FormatInt(start.Unix(), 16))
|
|
|
|
if pm.next == 1 {
|
|
return start, pid
|
|
}
|
|
pid = IDType(string(pid) + "-" + strconv.FormatInt(pm.next, 10))
|
|
return start, pid
|
|
}
|
|
|
|
func (pm *Manager) remove(process *process) {
|
|
process.TraceTrask.End()
|
|
deleted := false
|
|
|
|
pm.mutex.Lock()
|
|
if pm.processMap[process.PID] == process {
|
|
delete(pm.processMap, process.PID)
|
|
deleted = true
|
|
}
|
|
pm.mutex.Unlock()
|
|
|
|
if deleted {
|
|
Trace(false, process.PID, process.Description, process.ParentPID, process.Type)
|
|
}
|
|
}
|
|
|
|
// Cancel a process in the ProcessManager.
|
|
func (pm *Manager) Cancel(pid IDType) {
|
|
pm.mutex.Lock()
|
|
process, ok := pm.processMap[pid]
|
|
pm.mutex.Unlock()
|
|
if ok && process.Type != SystemProcessType {
|
|
process.Cancel()
|
|
}
|
|
}
|