/
loader.go
180 lines (153 loc) · 3.93 KB
/
loader.go
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// SPDX-FileCopyrightText: 2018 - 2022 UnionTech Software Technology Co., Ltd.
//
// SPDX-License-Identifier: GPL-3.0-or-later
package loader
import (
"fmt"
"sync"
"time"
"github.com/linuxdeepin/go-lib/dbusutil"
"github.com/linuxdeepin/go-lib/log"
)
type EnableFlag int
const (
EnableFlagNone EnableFlag = 1 << iota
EnableFlagIgnoreMissingModule
EnableFlagForceStart
)
func (flags EnableFlag) HasFlag(flag EnableFlag) bool {
return flags&flag != 0
}
const (
ErrorNoDependencies int = iota
ErrorCircleDependencies
ErrorMissingModule
ErrorInternalError
ErrorConflict
)
type EnableError struct {
ModuleName string
Code int
detail string
}
func (e *EnableError) Error() string {
switch e.Code {
case ErrorNoDependencies:
return fmt.Sprintf("%s's dependencies is not meet, %s is need", e.ModuleName, e.detail)
case ErrorCircleDependencies:
return "dependency circle"
// return fmt.Sprintf("%s and %s dependency each other.", e.ModuleName, e.detail)
case ErrorMissingModule:
return fmt.Sprintf("%s is missing", e.ModuleName)
case ErrorInternalError:
return fmt.Sprintf("%s started failed: %s", e.ModuleName, e.detail)
case ErrorConflict:
return fmt.Sprintf("tring to enable disabled module(%s)", e.ModuleName)
}
panic("EnableError: Unknown Error, Should not be reached")
}
type Loader struct {
modules Modules
log *log.Logger
lock sync.Mutex
service *dbusutil.Service
}
func (l *Loader) SetLogLevel(pri log.Priority) {
l.log.SetLogLevel(pri)
l.lock.Lock()
defer l.lock.Unlock()
for _, module := range l.modules {
module.SetLogLevel(pri)
}
}
func (l *Loader) AddModule(m Module) {
l.lock.Lock()
defer l.lock.Unlock()
name := m.Name()
_, exist := l.modules[name]
if exist {
l.log.Debug("Register", name, "is already registered")
return
}
l.log.Debug("Register module:", name)
l.modules[name] = m
}
func (l *Loader) DeleteModule(name string) {
l.lock.Lock()
defer l.lock.Unlock()
delete(l.modules, name)
}
func (l *Loader) List() []Module {
l.lock.Lock()
defer l.lock.Unlock()
modules := make([]Module, 0, len(l.modules))
for _, m := range l.modules {
modules = append(modules, m)
}
return modules
}
func (l *Loader) GetModule(name string) Module {
l.lock.Lock()
defer l.lock.Unlock()
return l.modules[name]
}
func (l *Loader) WaitDependencies(module Module) {
for _, dependencyName := range module.GetDependencies() {
l.modules[dependencyName].WaitEnable()
}
}
func (l *Loader) EnableModules(enablingModules []string, disableModules []string, flag EnableFlag) error {
l.lock.Lock()
defer l.lock.Unlock()
// build a dag
startTime := time.Now()
builder := NewDAGBuilder(l, enablingModules, disableModules, flag)
dag, err := builder.Execute()
if err != nil {
return err
}
endTime := time.Now()
duration := endTime.Sub(startTime)
l.log.Infof("build dag done, cost %s", duration)
// perform a topo sort
nodes, ok := dag.TopologicalDag()
if !ok {
return &EnableError{Code: ErrorCircleDependencies}
}
endTime = time.Now()
duration = endTime.Sub(startTime)
l.log.Infof("topo sort done, cost add up to %s", duration)
// enable modules
for _, node := range nodes {
if node == nil {
continue
}
module := l.modules[node.ID]
name := node.ID
go func() {
l.log.Info("enable module", name)
startTime := time.Now()
// wait for its dependency
l.WaitDependencies(module)
endTime := time.Now()
duration := endTime.Sub(startTime)
l.log.Info("module", name, "wait done, cost", duration)
err := module.Enable(true)
endTime = time.Now()
duration = endTime.Sub(startTime)
if err != nil {
l.log.Fatalf("enable module %s failed: %s, cost %s", name, err, duration)
} else {
l.log.Infof("enable module %s done cost %s", name, duration)
}
}()
}
for _, n := range nodes {
m := l.modules[n.ID]
m.WaitEnable()
}
endTime = time.Now()
duration = endTime.Sub(startTime)
l.log.Infof("enable modules done, cost add up to %s", duration)
return nil
}